drivers/usb/typec/tcpm/tcpm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2015-2017 Google, Inc
   4  *
   5  * USB Power Delivery protocol stack.
   6  */
   7
   8 #include <linux/completion.h>
   9 #include <linux/debugfs.h>
  10 #include <linux/device.h>
  11 #include <linux/hrtimer.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/kernel.h>
  14 #include <linux/kthread.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/power_supply.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/property.h>
  20 #include <linux/sched/clock.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/pd.h>
  26 #include <linux/usb/pd_ado.h>
  27 #include <linux/usb/pd_bdo.h>
  28 #include <linux/usb/pd_ext_sdb.h>
  29 #include <linux/usb/pd_vdo.h>
  30 #include <linux/usb/role.h>
  31 #include <linux/usb/tcpm.h>
  32 #include <linux/usb/typec_altmode.h>
  33
  34 #include <uapi/linux/sched/types.h>
  35
  36 #define FOREACH_STATE(S)                        \
  37         S(INVALID_STATE),                       \
  38         S(TOGGLING),                    \
  39         S(SRC_UNATTACHED),                      \
  40         S(SRC_ATTACH_WAIT),                     \
  41         S(SRC_ATTACHED),                        \
  42         S(SRC_STARTUP),                         \
  43         S(SRC_SEND_CAPABILITIES),               \
  44         S(SRC_SEND_CAPABILITIES_TIMEOUT),       \
  45         S(SRC_NEGOTIATE_CAPABILITIES),          \
  46         S(SRC_TRANSITION_SUPPLY),               \
  47         S(SRC_READY),                           \
  48         S(SRC_WAIT_NEW_CAPABILITIES),           \
  49                                                 \
  50         S(SNK_UNATTACHED),                      \
  51         S(SNK_ATTACH_WAIT),                     \
  52         S(SNK_DEBOUNCED),                       \
  53         S(SNK_ATTACHED),                        \
  54         S(SNK_STARTUP),                         \
  55         S(SNK_DISCOVERY),                       \
  56         S(SNK_DISCOVERY_DEBOUNCE),              \
  57         S(SNK_DISCOVERY_DEBOUNCE_DONE),         \
  58         S(SNK_WAIT_CAPABILITIES),               \
  59         S(SNK_NEGOTIATE_CAPABILITIES),          \
  60         S(SNK_NEGOTIATE_PPS_CAPABILITIES),      \
  61         S(SNK_TRANSITION_SINK),                 \
  62         S(SNK_TRANSITION_SINK_VBUS),            \
  63         S(SNK_READY),                           \
  64                                                 \
  65         S(ACC_UNATTACHED),                      \
  66         S(DEBUG_ACC_ATTACHED),                  \
  67         S(AUDIO_ACC_ATTACHED),                  \
  68         S(AUDIO_ACC_DEBOUNCE),                  \
  69                                                 \
  70         S(HARD_RESET_SEND),                     \
  71         S(HARD_RESET_START),                    \
  72         S(SRC_HARD_RESET_VBUS_OFF),             \
  73         S(SRC_HARD_RESET_VBUS_ON),              \
  74         S(SNK_HARD_RESET_SINK_OFF),             \
  75         S(SNK_HARD_RESET_WAIT_VBUS),            \
  76         S(SNK_HARD_RESET_SINK_ON),              \
  77                                                 \
  78         S(SOFT_RESET),                          \
  79         S(SRC_SOFT_RESET_WAIT_SNK_TX),          \
  80         S(SNK_SOFT_RESET),                      \
  81         S(SOFT_RESET_SEND),                     \
  82                                                 \
  83         S(DR_SWAP_ACCEPT),                      \
  84         S(DR_SWAP_SEND),                        \
  85         S(DR_SWAP_SEND_TIMEOUT),                \
  86         S(DR_SWAP_CANCEL),                      \
  87         S(DR_SWAP_CHANGE_DR),                   \
  88                                                 \
  89         S(PR_SWAP_ACCEPT),                      \
  90         S(PR_SWAP_SEND),                        \
  91         S(PR_SWAP_SEND_TIMEOUT),                \
  92         S(PR_SWAP_CANCEL),                      \
  93         S(PR_SWAP_START),                       \
  94         S(PR_SWAP_SRC_SNK_TRANSITION_OFF),      \
  95         S(PR_SWAP_SRC_SNK_SOURCE_OFF),          \
  96         S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
  97         S(PR_SWAP_SRC_SNK_SINK_ON),             \
  98         S(PR_SWAP_SNK_SRC_SINK_OFF),            \
  99         S(PR_SWAP_SNK_SRC_SOURCE_ON),           \
 100         S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
 101                                                 \
 102         S(VCONN_SWAP_ACCEPT),                   \
 103         S(VCONN_SWAP_SEND),                     \
 104         S(VCONN_SWAP_SEND_TIMEOUT),             \
 105         S(VCONN_SWAP_CANCEL),                   \
 106         S(VCONN_SWAP_START),                    \
 107         S(VCONN_SWAP_WAIT_FOR_VCONN),           \
 108         S(VCONN_SWAP_TURN_ON_VCONN),            \
 109         S(VCONN_SWAP_TURN_OFF_VCONN),           \
 110                                                 \
 111         S(FR_SWAP_SEND),                        \
 112         S(FR_SWAP_SEND_TIMEOUT),                \
 113         S(FR_SWAP_SNK_SRC_TRANSITION_TO_OFF),                   \
 114         S(FR_SWAP_SNK_SRC_NEW_SINK_READY),              \
 115         S(FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED), \
 116         S(FR_SWAP_CANCEL),                      \
 117                                                 \
 118         S(SNK_TRY),                             \
 119         S(SNK_TRY_WAIT),                        \
 120         S(SNK_TRY_WAIT_DEBOUNCE),               \
 121         S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
 122         S(SRC_TRYWAIT),                         \
 123         S(SRC_TRYWAIT_DEBOUNCE),                \
 124         S(SRC_TRYWAIT_UNATTACHED),              \
 125                                                 \
 126         S(SRC_TRY),                             \
 127         S(SRC_TRY_WAIT),                        \
 128         S(SRC_TRY_DEBOUNCE),                    \
 129         S(SNK_TRYWAIT),                         \
 130         S(SNK_TRYWAIT_DEBOUNCE),                \
 131         S(SNK_TRYWAIT_VBUS),                    \
 132         S(BIST_RX),                             \
 133                                                 \
 134         S(GET_STATUS_SEND),                     \
 135         S(GET_STATUS_SEND_TIMEOUT),             \
 136         S(GET_PPS_STATUS_SEND),                 \
 137         S(GET_PPS_STATUS_SEND_TIMEOUT),         \
 138                                                 \
 139         S(GET_SINK_CAP),                        \
 140         S(GET_SINK_CAP_TIMEOUT),                \
 141                                                 \
 142         S(ERROR_RECOVERY),                      \
 143         S(PORT_RESET),                          \
 144         S(PORT_RESET_WAIT_OFF),                 \
 145                                                 \
 146         S(AMS_START),                           \
 147         S(CHUNK_NOT_SUPP)
 148
 149 #define FOREACH_AMS(S)                          \
 150         S(NONE_AMS),                            \
 151         S(POWER_NEGOTIATION),                   \
 152         S(GOTOMIN),                             \
 153         S(SOFT_RESET_AMS),                      \
 154         S(HARD_RESET),                          \
 155         S(CABLE_RESET),                         \
 156         S(GET_SOURCE_CAPABILITIES),             \
 157         S(GET_SINK_CAPABILITIES),               \
 158         S(POWER_ROLE_SWAP),                     \
 159         S(FAST_ROLE_SWAP),                      \
 160         S(DATA_ROLE_SWAP),                      \
 161         S(VCONN_SWAP),                          \
 162         S(SOURCE_ALERT),                        \
 163         S(GETTING_SOURCE_EXTENDED_CAPABILITIES),\
 164         S(GETTING_SOURCE_SINK_STATUS),          \
 165         S(GETTING_BATTERY_CAPABILITIES),        \
 166         S(GETTING_BATTERY_STATUS),              \
 167         S(GETTING_MANUFACTURER_INFORMATION),    \
 168         S(SECURITY),                            \
 169         S(FIRMWARE_UPDATE),                     \
 170         S(DISCOVER_IDENTITY),                   \
 171         S(SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY), \
 172         S(DISCOVER_SVIDS),                      \
 173         S(DISCOVER_MODES),                      \
 174         S(DFP_TO_UFP_ENTER_MODE),               \
 175         S(DFP_TO_UFP_EXIT_MODE),                \
 176         S(DFP_TO_CABLE_PLUG_ENTER_MODE),        \
 177         S(DFP_TO_CABLE_PLUG_EXIT_MODE),         \
 178         S(ATTENTION),                           \
 179         S(BIST),                                \
 180         S(UNSTRUCTURED_VDMS),                   \
 181         S(STRUCTURED_VDMS),                     \
 182         S(COUNTRY_INFO),                        \
 183         S(COUNTRY_CODES)
 184
 185 #define GENERATE_ENUM(e)        e
 186 #define GENERATE_STRING(s)      #s
 187
 188 enum tcpm_state {
 189         FOREACH_STATE(GENERATE_ENUM)
 190 };
 191
 192 static const char * const tcpm_states[] = {
 193         FOREACH_STATE(GENERATE_STRING)
 194 };
 195
 196 enum tcpm_ams {
 197         FOREACH_AMS(GENERATE_ENUM)
 198 };
 199
 200 static const char * const tcpm_ams_str[] = {
 201         FOREACH_AMS(GENERATE_STRING)
 202 };
 203
 204 enum vdm_states {
 205         VDM_STATE_ERR_BUSY = -3,
 206         VDM_STATE_ERR_SEND = -2,
 207         VDM_STATE_ERR_TMOUT = -1,
 208         VDM_STATE_DONE = 0,
 209         /* Anything >0 represents an active state */
 210         VDM_STATE_READY = 1,
 211         VDM_STATE_BUSY = 2,
 212         VDM_STATE_WAIT_RSP_BUSY = 3,
 213         VDM_STATE_SEND_MESSAGE = 4,
 214 };
 215
 216 enum pd_msg_request {
 217         PD_MSG_NONE = 0,
 218         PD_MSG_CTRL_REJECT,
 219         PD_MSG_CTRL_WAIT,
 220         PD_MSG_CTRL_NOT_SUPP,
 221         PD_MSG_DATA_SINK_CAP,
 222         PD_MSG_DATA_SOURCE_CAP,
 223 };
 224
 225 enum adev_actions {
 226         ADEV_NONE = 0,
 227         ADEV_NOTIFY_USB_AND_QUEUE_VDM,
 228         ADEV_QUEUE_VDM,
 229         ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL,
 230         ADEV_ATTENTION,
 231 };
 232
 233 /*
 234  * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
 235  * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
 236  * Version 1.2"
 237  */
 238 enum frs_typec_current {
 239         FRS_NOT_SUPPORTED,
 240         FRS_DEFAULT_POWER,
 241         FRS_5V_1P5A,
 242         FRS_5V_3A,
 243 };
 244
 245 /* Events from low level driver */
 246
 247 #define TCPM_CC_EVENT           BIT(0)
 248 #define TCPM_VBUS_EVENT         BIT(1)
 249 #define TCPM_RESET_EVENT        BIT(2)
 250 #define TCPM_FRS_EVENT          BIT(3)
 251 #define TCPM_SOURCING_VBUS      BIT(4)
 252
 253 #define LOG_BUFFER_ENTRIES      1024
 254 #define LOG_BUFFER_ENTRY_SIZE   128
 255
 256 /* Alternate mode support */
 257
 258 #define SVID_DISCOVERY_MAX      16
 259 #define ALTMODE_DISCOVERY_MAX   (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
 260
 261 #define GET_SINK_CAP_RETRY_MS   100
 262 #define SEND_DISCOVER_RETRY_MS  100
 263
 264 struct pd_mode_data {
 265         int svid_index;         /* current SVID index           */
 266         int nsvids;
 267         u16 svids[SVID_DISCOVERY_MAX];
 268         int altmodes;           /* number of alternate modes    */
 269         struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
 270 };
 271
 272 /*
 273  * @min_volt: Actual min voltage at the local port
 274  * @req_min_volt: Requested min voltage to the port partner
 275  * @max_volt: Actual max voltage at the local port
 276  * @req_max_volt: Requested max voltage to the port partner
 277  * @max_curr: Actual max current at the local port
 278  * @req_max_curr: Requested max current of the port partner
 279  * @req_out_volt: Requested output voltage to the port partner
 280  * @req_op_curr: Requested operating current to the port partner
 281  * @supported: Parter has atleast one APDO hence supports PPS
 282  * @active: PPS mode is active
 283  */
 284 struct pd_pps_data {
 285         u32 min_volt;
 286         u32 req_min_volt;
 287         u32 max_volt;
 288         u32 req_max_volt;
 289         u32 max_curr;
 290         u32 req_max_curr;
 291         u32 req_out_volt;
 292         u32 req_op_curr;
 293         bool supported;
 294         bool active;
 295 };
 296
 297 struct tcpm_port {
 298         struct device *dev;
 299
 300         struct mutex lock;              /* tcpm state machine lock */
 301         struct kthread_worker *wq;
 302
 303         struct typec_capability typec_caps;
 304         struct typec_port *typec_port;
 305
 306         struct tcpc_dev *tcpc;
 307         struct usb_role_switch *role_sw;
 308
 309         enum typec_role vconn_role;
 310         enum typec_role pwr_role;
 311         enum typec_data_role data_role;
 312         enum typec_pwr_opmode pwr_opmode;
 313
 314         struct usb_pd_identity partner_ident;
 315         struct typec_partner_desc partner_desc;
 316         struct typec_partner *partner;
 317
 318         enum typec_cc_status cc_req;
 319
 320         enum typec_cc_status cc1;
 321         enum typec_cc_status cc2;
 322         enum typec_cc_polarity polarity;
 323
 324         bool attached;
 325         bool connected;
 326         enum typec_port_type port_type;
 327
 328         /*
 329          * Set to true when vbus is greater than VSAFE5V min.
 330          * Set to false when vbus falls below vSinkDisconnect max threshold.
 331          */
 332         bool vbus_present;
 333
 334         /*
 335          * Set to true when vbus is less than VSAFE0V max.
 336          * Set to false when vbus is greater than VSAFE0V max.
 337          */
 338         bool vbus_vsafe0v;
 339
 340         bool vbus_never_low;
 341         bool vbus_source;
 342         bool vbus_charge;
 343
 344         bool send_discover;
 345         bool op_vsafe5v;
 346
 347         int try_role;
 348         int try_snk_count;
 349         int try_src_count;
 350
 351         enum pd_msg_request queued_message;
 352
 353         enum tcpm_state enter_state;
 354         enum tcpm_state prev_state;
 355         enum tcpm_state state;
 356         enum tcpm_state delayed_state;
 357         ktime_t delayed_runtime;
 358         unsigned long delay_ms;
 359
 360         spinlock_t pd_event_lock;
 361         u32 pd_events;
 362
 363         struct kthread_work event_work;
 364         struct hrtimer state_machine_timer;
 365         struct kthread_work state_machine;
 366         struct hrtimer vdm_state_machine_timer;
 367         struct kthread_work vdm_state_machine;
 368         struct hrtimer enable_frs_timer;
 369         struct kthread_work enable_frs;
 370         struct hrtimer send_discover_timer;
 371         struct kthread_work send_discover_work;
 372         bool state_machine_running;
 373         bool vdm_sm_running;
 374
 375         struct completion tx_complete;
 376         enum tcpm_transmit_status tx_status;
 377
 378         struct mutex swap_lock;         /* swap command lock */
 379         bool swap_pending;
 380         bool non_pd_role_swap;
 381         struct completion swap_complete;
 382         int swap_status;
 383
 384         unsigned int negotiated_rev;
 385         unsigned int message_id;
 386         unsigned int caps_count;
 387         unsigned int hard_reset_count;
 388         bool pd_capable;
 389         bool explicit_contract;
 390         unsigned int rx_msgid;
 391
 392         /* Partner capabilities/requests */
 393         u32 sink_request;
 394         u32 source_caps[PDO_MAX_OBJECTS];
 395         unsigned int nr_source_caps;
 396         u32 sink_caps[PDO_MAX_OBJECTS];
 397         unsigned int nr_sink_caps;
 398
 399         /* Local capabilities */
 400         u32 src_pdo[PDO_MAX_OBJECTS];
 401         unsigned int nr_src_pdo;
 402         u32 snk_pdo[PDO_MAX_OBJECTS];
 403         unsigned int nr_snk_pdo;
 404         u32 snk_vdo_v1[VDO_MAX_OBJECTS];
 405         unsigned int nr_snk_vdo_v1;
 406         u32 snk_vdo[VDO_MAX_OBJECTS];
 407         unsigned int nr_snk_vdo;
 408
 409         unsigned int operating_snk_mw;
 410         bool update_sink_caps;
 411
 412         /* Requested current / voltage to the port partner */
 413         u32 req_current_limit;
 414         u32 req_supply_voltage;
 415         /* Actual current / voltage limit of the local port */
 416         u32 current_limit;
 417         u32 supply_voltage;
 418
 419         /* Used to export TA voltage and current */
 420         struct power_supply *psy;
 421         struct power_supply_desc psy_desc;
 422         enum power_supply_usb_type usb_type;
 423
 424         u32 bist_request;
 425
 426         /* PD state for Vendor Defined Messages */
 427         enum vdm_states vdm_state;
 428         u32 vdm_retries;
 429         /* next Vendor Defined Message to send */
 430         u32 vdo_data[VDO_MAX_SIZE];
 431         u8 vdo_count;
 432         /* VDO to retry if UFP responder replied busy */
 433         u32 vdo_retry;
 434
 435         /* PPS */
 436         struct pd_pps_data pps_data;
 437         struct completion pps_complete;
 438         bool pps_pending;
 439         int pps_status;
 440
 441         /* Alternate mode data */
 442         struct pd_mode_data mode_data;
 443         struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
 444         struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
 445
 446         /* Deadline in jiffies to exit src_try_wait state */
 447         unsigned long max_wait;
 448
 449         /* port belongs to a self powered device */
 450         bool self_powered;
 451
 452         /* Sink FRS */
 453         enum frs_typec_current new_source_frs_current;
 454
 455         /* Sink caps have been queried */
 456         bool sink_cap_done;
 457
 458         /* Collision Avoidance and Atomic Message Sequence */
 459         enum tcpm_state upcoming_state;
 460         enum tcpm_ams ams;
 461         enum tcpm_ams next_ams;
 462         bool in_ams;
 463
 464         /* Auto vbus discharge status */
 465         bool auto_vbus_discharge_enabled;
 466
 467         /*
 468          * When set, port requests PD_P_SNK_STDBY_MW upon entering SNK_DISCOVERY and
 469          * the actual currrent limit after RX of PD_CTRL_PSRDY for PD link,
 470          * SNK_READY for non-pd link.
 471          */
 472         bool slow_charger_loop;
 473 #ifdef CONFIG_DEBUG_FS
 474         struct dentry *dentry;
 475         struct mutex logbuffer_lock;    /* log buffer access lock */
 476         int logbuffer_head;
 477         int logbuffer_tail;
 478         u8 *logbuffer[LOG_BUFFER_ENTRIES];
 479 #endif
 480 };
 481
 482 struct pd_rx_event {
 483         struct kthread_work work;
 484         struct tcpm_port *port;
 485         struct pd_message msg;
 486 };
 487
 488 static const char * const pd_rev[] = {
 489         [PD_REV10]              = "rev1",
 490         [PD_REV20]              = "rev2",
 491         [PD_REV30]              = "rev3",
 492 };
 493
 494 #define tcpm_cc_is_sink(cc) \
 495         ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
 496          (cc) == TYPEC_CC_RP_3_0)
 497
 498 #define tcpm_port_is_sink(port) \
 499         ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
 500          (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
 501
 502 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
 503 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
 504 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
 505
 506 #define tcpm_port_is_source(port) \
 507         ((tcpm_cc_is_source((port)->cc1) && \
 508          !tcpm_cc_is_source((port)->cc2)) || \
 509          (tcpm_cc_is_source((port)->cc2) && \
 510           !tcpm_cc_is_source((port)->cc1)))
 511
 512 #define tcpm_port_is_debug(port) \
 513         (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
 514
 515 #define tcpm_port_is_audio(port) \
 516         (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
 517
 518 #define tcpm_port_is_audio_detached(port) \
 519         ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
 520          (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
 521
 522 #define tcpm_try_snk(port) \
 523         ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
 524         (port)->port_type == TYPEC_PORT_DRP)
 525
 526 #define tcpm_try_src(port) \
 527         ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
 528         (port)->port_type == TYPEC_PORT_DRP)
 529
 530 #define tcpm_data_role_for_source(port) \
 531         ((port)->typec_caps.data == TYPEC_PORT_UFP ? \
 532         TYPEC_DEVICE : TYPEC_HOST)
 533
 534 #define tcpm_data_role_for_sink(port) \
 535         ((port)->typec_caps.data == TYPEC_PORT_DFP ? \
 536         TYPEC_HOST : TYPEC_DEVICE)
 537
 538 #define tcpm_sink_tx_ok(port) \
 539         (tcpm_port_is_sink(port) && \
 540         ((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
 541
 542 #define tcpm_wait_for_discharge(port) \
 543         (((port)->auto_vbus_discharge_enabled && !(port)->vbus_vsafe0v) ? PD_T_SAFE_0V : 0)
 544
 545 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
 546 {
 547         if (port->port_type == TYPEC_PORT_DRP) {
 548                 if (port->try_role == TYPEC_SINK)
 549                         return SNK_UNATTACHED;
 550                 else if (port->try_role == TYPEC_SOURCE)
 551                         return SRC_UNATTACHED;
 552                 /* Fall through to return SRC_UNATTACHED */
 553         } else if (port->port_type == TYPEC_PORT_SNK) {
 554                 return SNK_UNATTACHED;
 555         }
 556         return SRC_UNATTACHED;
 557 }
 558
 559 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
 560 {
 561         return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
 562                 port->cc2 == TYPEC_CC_OPEN) ||
 563                (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
 564                                     port->cc1 == TYPEC_CC_OPEN) ||
 565                                    (port->polarity == TYPEC_POLARITY_CC2 &&
 566                                     port->cc2 == TYPEC_CC_OPEN)));
 567 }
 568
 569 /*
 570  * Logging
 571  */
 572
 573 #ifdef CONFIG_DEBUG_FS
 574
 575 static bool tcpm_log_full(struct tcpm_port *port)
 576 {
 577         return port->logbuffer_tail ==
 578                 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 579 }
 580
 581 __printf(2, 0)
 582 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 583 {
 584         char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
 585         u64 ts_nsec = local_clock();
 586         unsigned long rem_nsec;
 587
 588         mutex_lock(&port->logbuffer_lock);
 589         if (!port->logbuffer[port->logbuffer_head]) {
 590                 port->logbuffer[port->logbuffer_head] =
 591                                 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
 592                 if (!port->logbuffer[port->logbuffer_head]) {
 593                         mutex_unlock(&port->logbuffer_lock);
 594                         return;
 595                 }
 596         }
 597
 598         vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
 599
 600         if (tcpm_log_full(port)) {
 601                 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
 602                 strcpy(tmpbuffer, "overflow");
 603         }
 604
 605         if (port->logbuffer_head < 0 ||
 606             port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
 607                 dev_warn(port->dev,
 608                          "Bad log buffer index %d\n", port->logbuffer_head);
 609                 goto abort;
 610         }
 611
 612         if (!port->logbuffer[port->logbuffer_head]) {
 613                 dev_warn(port->dev,
 614                          "Log buffer index %d is NULL\n", port->logbuffer_head);
 615                 goto abort;
 616         }
 617
 618         rem_nsec = do_div(ts_nsec, 1000000000);
 619         scnprintf(port->logbuffer[port->logbuffer_head],
 620                   LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
 621                   (unsigned long)ts_nsec, rem_nsec / 1000,
 622                   tmpbuffer);
 623         port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 624
 625 abort:
 626         mutex_unlock(&port->logbuffer_lock);
 627 }
 628
 629 __printf(2, 3)
 630 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
 631 {
 632         va_list args;
 633
 634         /* Do not log while disconnected and unattached */
 635         if (tcpm_port_is_disconnected(port) &&
 636             (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
 637              port->state == TOGGLING))
 638                 return;
 639
 640         va_start(args, fmt);
 641         _tcpm_log(port, fmt, args);
 642         va_end(args);
 643 }
 644
 645 __printf(2, 3)
 646 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
 647 {
 648         va_list args;
 649
 650         va_start(args, fmt);
 651         _tcpm_log(port, fmt, args);
 652         va_end(args);
 653 }
 654
 655 static void tcpm_log_source_caps(struct tcpm_port *port)
 656 {
 657         int i;
 658
 659         for (i = 0; i < port->nr_source_caps; i++) {
 660                 u32 pdo = port->source_caps[i];
 661                 enum pd_pdo_type type = pdo_type(pdo);
 662                 char msg[64];
 663
 664                 switch (type) {
 665                 case PDO_TYPE_FIXED:
 666                         scnprintf(msg, sizeof(msg),
 667                                   "%u mV, %u mA [%s%s%s%s%s%s]",
 668                                   pdo_fixed_voltage(pdo),
 669                                   pdo_max_current(pdo),
 670                                   (pdo & PDO_FIXED_DUAL_ROLE) ?
 671                                                         "R" : "",
 672                                   (pdo & PDO_FIXED_SUSPEND) ?
 673                                                         "S" : "",
 674                                   (pdo & PDO_FIXED_HIGHER_CAP) ?
 675                                                         "H" : "",
 676                                   (pdo & PDO_FIXED_USB_COMM) ?
 677                                                         "U" : "",
 678                                   (pdo & PDO_FIXED_DATA_SWAP) ?
 679                                                         "D" : "",
 680                                   (pdo & PDO_FIXED_EXTPOWER) ?
 681                                                         "E" : "");
 682                         break;
 683                 case PDO_TYPE_VAR:
 684                         scnprintf(msg, sizeof(msg),
 685                                   "%u-%u mV, %u mA",
 686                                   pdo_min_voltage(pdo),
 687                                   pdo_max_voltage(pdo),
 688                                   pdo_max_current(pdo));
 689                         break;
 690                 case PDO_TYPE_BATT:
 691                         scnprintf(msg, sizeof(msg),
 692                                   "%u-%u mV, %u mW",
 693                                   pdo_min_voltage(pdo),
 694                                   pdo_max_voltage(pdo),
 695                                   pdo_max_power(pdo));
 696                         break;
 697                 case PDO_TYPE_APDO:
 698                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
 699                                 scnprintf(msg, sizeof(msg),
 700                                           "%u-%u mV, %u mA",
 701                                           pdo_pps_apdo_min_voltage(pdo),
 702                                           pdo_pps_apdo_max_voltage(pdo),
 703                                           pdo_pps_apdo_max_current(pdo));
 704                         else
 705                                 strcpy(msg, "undefined APDO");
 706                         break;
 707                 default:
 708                         strcpy(msg, "undefined");
 709                         break;
 710                 }
 711                 tcpm_log(port, " PDO %d: type %d, %s",
 712                          i, type, msg);
 713         }
 714 }
 715
 716 static int tcpm_debug_show(struct seq_file *s, void *v)
 717 {
 718         struct tcpm_port *port = (struct tcpm_port *)s->private;
 719         int tail;
 720
 721         mutex_lock(&port->logbuffer_lock);
 722         tail = port->logbuffer_tail;
 723         while (tail != port->logbuffer_head) {
 724                 seq_printf(s, "%s\n", port->logbuffer[tail]);
 725                 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
 726         }
 727         if (!seq_has_overflowed(s))
 728                 port->logbuffer_tail = tail;
 729         mutex_unlock(&port->logbuffer_lock);
 730
 731         return 0;
 732 }
 733 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 734
 735 static void tcpm_debugfs_init(struct tcpm_port *port)
 736 {
 737         char name[NAME_MAX];
 738
 739         mutex_init(&port->logbuffer_lock);
 740         snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
 741         port->dentry = debugfs_create_dir(name, usb_debug_root);
 742         debugfs_create_file("log", S_IFREG | 0444, port->dentry, port,
 743                             &tcpm_debug_fops);
 744 }
 745
 746 static void tcpm_debugfs_exit(struct tcpm_port *port)
 747 {
 748         int i;
 749
 750         mutex_lock(&port->logbuffer_lock);
 751         for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
 752                 kfree(port->logbuffer[i]);
 753                 port->logbuffer[i] = NULL;
 754         }
 755         mutex_unlock(&port->logbuffer_lock);
 756
 757         debugfs_remove(port->dentry);
 758 }
 759
 760 #else
 761
 762 __printf(2, 3)
 763 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 764 __printf(2, 3)
 765 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 766 static void tcpm_log_source_caps(struct tcpm_port *port) { }
 767 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 768 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 769
 770 #endif
 771
 772 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
 773 {
 774         tcpm_log(port, "cc:=%d", cc);
 775         port->cc_req = cc;
 776         port->tcpc->set_cc(port->tcpc, cc);
 777 }
 778
 779 /*
 780  * Determine RP value to set based on maximum current supported
 781  * by a port if configured as source.
 782  * Returns CC value to report to link partner.
 783  */
 784 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
 785 {
 786         const u32 *src_pdo = port->src_pdo;
 787         int nr_pdo = port->nr_src_pdo;
 788         int i;
 789
 790         /*
 791          * Search for first entry with matching voltage.
 792          * It should report the maximum supported current.
 793          */
 794         for (i = 0; i < nr_pdo; i++) {
 795                 const u32 pdo = src_pdo[i];
 796
 797                 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
 798                     pdo_fixed_voltage(pdo) == 5000) {
 799                         unsigned int curr = pdo_max_current(pdo);
 800
 801                         if (curr >= 3000)
 802                                 return TYPEC_CC_RP_3_0;
 803                         else if (curr >= 1500)
 804                                 return TYPEC_CC_RP_1_5;
 805                         return TYPEC_CC_RP_DEF;
 806                 }
 807         }
 808
 809         return TYPEC_CC_RP_DEF;
 810 }
 811
 812 static void tcpm_ams_finish(struct tcpm_port *port)
 813 {
 814         tcpm_log(port, "AMS %s finished", tcpm_ams_str[port->ams]);
 815
 816         if (port->pd_capable && port->pwr_role == TYPEC_SOURCE) {
 817                 if (port->negotiated_rev >= PD_REV30)
 818                         tcpm_set_cc(port, SINK_TX_OK);
 819                 else
 820                         tcpm_set_cc(port, SINK_TX_NG);
 821         } else if (port->pwr_role == TYPEC_SOURCE) {
 822                 tcpm_set_cc(port, tcpm_rp_cc(port));
 823         }
 824
 825         port->in_ams = false;
 826         port->ams = NONE_AMS;
 827 }
 828
 829 static int tcpm_pd_transmit(struct tcpm_port *port,
 830                             enum tcpm_transmit_type type,
 831                             const struct pd_message *msg)
 832 {
 833         unsigned long timeout;
 834         int ret;
 835
 836         if (msg)
 837                 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
 838         else
 839                 tcpm_log(port, "PD TX, type: %#x", type);
 840
 841         reinit_completion(&port->tx_complete);
 842         ret = port->tcpc->pd_transmit(port->tcpc, type, msg, port->negotiated_rev);
 843         if (ret < 0)
 844                 return ret;
 845
 846         mutex_unlock(&port->lock);
 847         timeout = wait_for_completion_timeout(&port->tx_complete,
 848                                 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
 849         mutex_lock(&port->lock);
 850         if (!timeout)
 851                 return -ETIMEDOUT;
 852
 853         switch (port->tx_status) {
 854         case TCPC_TX_SUCCESS:
 855                 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
 856                 /*
 857                  * USB PD rev 2.0, 8.3.2.2.1:
 858                  * USB PD rev 3.0, 8.3.2.1.3:
 859                  * "... Note that every AMS is Interruptible until the first
 860                  * Message in the sequence has been successfully sent (GoodCRC
 861                  * Message received)."
 862                  */
 863                 if (port->ams != NONE_AMS)
 864                         port->in_ams = true;
 865                 break;
 866         case TCPC_TX_DISCARDED:
 867                 ret = -EAGAIN;
 868                 break;
 869         case TCPC_TX_FAILED:
 870         default:
 871                 ret = -EIO;
 872                 break;
 873         }
 874
 875         /* Some AMS don't expect responses. Finish them here. */
 876         if (port->ams == ATTENTION || port->ams == SOURCE_ALERT)
 877                 tcpm_ams_finish(port);
 878
 879         return ret;
 880 }
 881
 882 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 883                                enum tcpm_transmit_status status)
 884 {
 885         tcpm_log(port, "PD TX complete, status: %u", status);
 886         port->tx_status = status;
 887         complete(&port->tx_complete);
 888 }
 889 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
 890
 891 static int tcpm_mux_set(struct tcpm_port *port, int state,
 892                         enum usb_role usb_role,
 893                         enum typec_orientation orientation)
 894 {
 895         int ret;
 896
 897         tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
 898                  state, usb_role, orientation);
 899
 900         ret = typec_set_orientation(port->typec_port, orientation);
 901         if (ret)
 902                 return ret;
 903
 904         if (port->role_sw) {
 905                 ret = usb_role_switch_set_role(port->role_sw, usb_role);
 906                 if (ret)
 907                         return ret;
 908         }
 909
 910         return typec_set_mode(port->typec_port, state);
 911 }
 912
 913 static int tcpm_set_polarity(struct tcpm_port *port,
 914                              enum typec_cc_polarity polarity)
 915 {
 916         int ret;
 917
 918         tcpm_log(port, "polarity %d", polarity);
 919
 920         ret = port->tcpc->set_polarity(port->tcpc, polarity);
 921         if (ret < 0)
 922                 return ret;
 923
 924         port->polarity = polarity;
 925
 926         return 0;
 927 }
 928
 929 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
 930 {
 931         int ret;
 932
 933         tcpm_log(port, "vconn:=%d", enable);
 934
 935         ret = port->tcpc->set_vconn(port->tcpc, enable);
 936         if (!ret) {
 937                 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
 938                 typec_set_vconn_role(port->typec_port, port->vconn_role);
 939         }
 940
 941         return ret;
 942 }
 943
 944 static u32 tcpm_get_current_limit(struct tcpm_port *port)
 945 {
 946         enum typec_cc_status cc;
 947         u32 limit;
 948
 949         cc = port->polarity ? port->cc2 : port->cc1;
 950         switch (cc) {
 951         case TYPEC_CC_RP_1_5:
 952                 limit = 1500;
 953                 break;
 954         case TYPEC_CC_RP_3_0:
 955                 limit = 3000;
 956                 break;
 957         case TYPEC_CC_RP_DEF:
 958         default:
 959                 if (port->tcpc->get_current_limit)
 960                         limit = port->tcpc->get_current_limit(port->tcpc);
 961                 else
 962                         limit = 0;
 963                 break;
 964         }
 965
 966         return limit;
 967 }
 968
 969 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
 970 {
 971         int ret = -EOPNOTSUPP;
 972
 973         tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
 974
 975         port->supply_voltage = mv;
 976         port->current_limit = max_ma;
 977         power_supply_changed(port->psy);
 978
 979         if (port->tcpc->set_current_limit)
 980                 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
 981
 982         return ret;
 983 }
 984
 985 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
 986 {
 987         return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
 988                                      port->data_role);
 989 }
 990
 991 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
 992                           enum typec_role role, enum typec_data_role data)
 993 {
 994         enum typec_orientation orientation;
 995         enum usb_role usb_role;
 996         int ret;
 997
 998         if (port->polarity == TYPEC_POLARITY_CC1)
 999                 orientation = TYPEC_ORIENTATION_NORMAL;
1000         else
1001                 orientation = TYPEC_ORIENTATION_REVERSE;
1002
1003         if (port->typec_caps.data == TYPEC_PORT_DRD) {
1004                 if (data == TYPEC_HOST)
1005                         usb_role = USB_ROLE_HOST;
1006                 else
1007                         usb_role = USB_ROLE_DEVICE;
1008         } else if (port->typec_caps.data == TYPEC_PORT_DFP) {
1009                 if (data == TYPEC_HOST) {
1010                         if (role == TYPEC_SOURCE)
1011                                 usb_role = USB_ROLE_HOST;
1012                         else
1013                                 usb_role = USB_ROLE_NONE;
1014                 } else {
1015                         return -ENOTSUPP;
1016                 }
1017         } else {
1018                 if (data == TYPEC_DEVICE) {
1019                         if (role == TYPEC_SINK)
1020                                 usb_role = USB_ROLE_DEVICE;
1021                         else
1022                                 usb_role = USB_ROLE_NONE;
1023                 } else {
1024                         return -ENOTSUPP;
1025                 }
1026         }
1027
1028         ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
1029         if (ret < 0)
1030                 return ret;
1031
1032         ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
1033         if (ret < 0)
1034                 return ret;
1035
1036         port->pwr_role = role;
1037         port->data_role = data;
1038         typec_set_data_role(port->typec_port, data);
1039         typec_set_pwr_role(port->typec_port, role);
1040
1041         return 0;
1042 }
1043
1044 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
1045 {
1046         int ret;
1047
1048         ret = port->tcpc->set_roles(port->tcpc, true, role,
1049                                     port->data_role);
1050         if (ret < 0)
1051                 return ret;
1052
1053         port->pwr_role = role;
1054         typec_set_pwr_role(port->typec_port, role);
1055
1056         return 0;
1057 }
1058
1059 /*
1060  * Transform the PDO to be compliant to PD rev2.0.
1061  * Return 0 if the PDO type is not defined in PD rev2.0.
1062  * Otherwise, return the converted PDO.
1063  */
1064 static u32 tcpm_forge_legacy_pdo(struct tcpm_port *port, u32 pdo, enum typec_role role)
1065 {
1066         switch (pdo_type(pdo)) {
1067         case PDO_TYPE_FIXED:
1068                 if (role == TYPEC_SINK)
1069                         return pdo & ~PDO_FIXED_FRS_CURR_MASK;
1070                 else
1071                         return pdo & ~PDO_FIXED_UNCHUNK_EXT;
1072         case PDO_TYPE_VAR:
1073         case PDO_TYPE_BATT:
1074                 return pdo;
1075         case PDO_TYPE_APDO:
1076         default:
1077                 return 0;
1078         }
1079 }
1080
1081 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
1082 {
1083         struct pd_message msg;
1084         u32 pdo;
1085         unsigned int i, nr_pdo = 0;
1086
1087         memset(&msg, 0, sizeof(msg));
1088
1089         for (i = 0; i < port->nr_src_pdo; i++) {
1090                 if (port->negotiated_rev >= PD_REV30) {
1091                         msg.payload[nr_pdo++] = cpu_to_le32(port->src_pdo[i]);
1092                 } else {
1093                         pdo = tcpm_forge_legacy_pdo(port, port->src_pdo[i], TYPEC_SOURCE);
1094                         if (pdo)
1095                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1096                 }
1097         }
1098
1099         if (!nr_pdo) {
1100                 /* No source capabilities defined, sink only */
1101                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1102                                           port->pwr_role,
1103                                           port->data_role,
1104                                           port->negotiated_rev,
1105                                           port->message_id, 0);
1106         } else {
1107                 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
1108                                           port->pwr_role,
1109                                           port->data_role,
1110                                           port->negotiated_rev,
1111                                           port->message_id,
1112                                           nr_pdo);
1113         }
1114
1115         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1116 }
1117
1118 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
1119 {
1120         struct pd_message msg;
1121         u32 pdo;
1122         unsigned int i, nr_pdo = 0;
1123
1124         memset(&msg, 0, sizeof(msg));
1125
1126         for (i = 0; i < port->nr_snk_pdo; i++) {
1127                 if (port->negotiated_rev >= PD_REV30) {
1128                         msg.payload[nr_pdo++] = cpu_to_le32(port->snk_pdo[i]);
1129                 } else {
1130                         pdo = tcpm_forge_legacy_pdo(port, port->snk_pdo[i], TYPEC_SINK);
1131                         if (pdo)
1132                                 msg.payload[nr_pdo++] = cpu_to_le32(pdo);
1133                 }
1134         }
1135
1136         if (!nr_pdo) {
1137                 /* No sink capabilities defined, source only */
1138                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
1139                                           port->pwr_role,
1140                                           port->data_role,
1141                                           port->negotiated_rev,
1142                                           port->message_id, 0);
1143         } else {
1144                 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
1145                                           port->pwr_role,
1146                                           port->data_role,
1147                                           port->negotiated_rev,
1148                                           port->message_id,
1149                                           nr_pdo);
1150         }
1151
1152         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1153 }
1154
1155 static void mod_tcpm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1156 {
1157         if (delay_ms) {
1158                 hrtimer_start(&port->state_machine_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1159         } else {
1160                 hrtimer_cancel(&port->state_machine_timer);
1161                 kthread_queue_work(port->wq, &port->state_machine);
1162         }
1163 }
1164
1165 static void mod_vdm_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1166 {
1167         if (delay_ms) {
1168                 hrtimer_start(&port->vdm_state_machine_timer, ms_to_ktime(delay_ms),
1169                               HRTIMER_MODE_REL);
1170         } else {
1171                 hrtimer_cancel(&port->vdm_state_machine_timer);
1172                 kthread_queue_work(port->wq, &port->vdm_state_machine);
1173         }
1174 }
1175
1176 static void mod_enable_frs_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1177 {
1178         if (delay_ms) {
1179                 hrtimer_start(&port->enable_frs_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1180         } else {
1181                 hrtimer_cancel(&port->enable_frs_timer);
1182                 kthread_queue_work(port->wq, &port->enable_frs);
1183         }
1184 }
1185
1186 static void mod_send_discover_delayed_work(struct tcpm_port *port, unsigned int delay_ms)
1187 {
1188         if (delay_ms) {
1189                 hrtimer_start(&port->send_discover_timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL);
1190         } else {
1191                 hrtimer_cancel(&port->send_discover_timer);
1192                 kthread_queue_work(port->wq, &port->send_discover_work);
1193         }
1194 }
1195
1196 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
1197                            unsigned int delay_ms)
1198 {
1199         if (delay_ms) {
1200                 tcpm_log(port, "pending state change %s -> %s @ %u ms [%s %s]",
1201                          tcpm_states[port->state], tcpm_states[state], delay_ms,
1202                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1203                 port->delayed_state = state;
1204                 mod_tcpm_delayed_work(port, delay_ms);
1205                 port->delayed_runtime = ktime_add(ktime_get(), ms_to_ktime(delay_ms));
1206                 port->delay_ms = delay_ms;
1207         } else {
1208                 tcpm_log(port, "state change %s -> %s [%s %s]",
1209                          tcpm_states[port->state], tcpm_states[state],
1210                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1211                 port->delayed_state = INVALID_STATE;
1212                 port->prev_state = port->state;
1213                 port->state = state;
1214                 /*
1215                  * Don't re-queue the state machine work item if we're currently
1216                  * in the state machine and we're immediately changing states.
1217                  * tcpm_state_machine_work() will continue running the state
1218                  * machine.
1219                  */
1220                 if (!port->state_machine_running)
1221                         mod_tcpm_delayed_work(port, 0);
1222         }
1223 }
1224
1225 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
1226                                 unsigned int delay_ms)
1227 {
1228         if (port->enter_state == port->state)
1229                 tcpm_set_state(port, state, delay_ms);
1230         else
1231                 tcpm_log(port,
1232                          "skipped %sstate change %s -> %s [%u ms], context state %s [%s %s]",
1233                          delay_ms ? "delayed " : "",
1234                          tcpm_states[port->state], tcpm_states[state],
1235                          delay_ms, tcpm_states[port->enter_state],
1236                          pd_rev[port->negotiated_rev], tcpm_ams_str[port->ams]);
1237 }
1238
1239 static void tcpm_queue_message(struct tcpm_port *port,
1240                                enum pd_msg_request message)
1241 {
1242         port->queued_message = message;
1243         mod_tcpm_delayed_work(port, 0);
1244 }
1245
1246 static bool tcpm_vdm_ams(struct tcpm_port *port)
1247 {
1248         switch (port->ams) {
1249         case DISCOVER_IDENTITY:
1250         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1251         case DISCOVER_SVIDS:
1252         case DISCOVER_MODES:
1253         case DFP_TO_UFP_ENTER_MODE:
1254         case DFP_TO_UFP_EXIT_MODE:
1255         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1256         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1257         case ATTENTION:
1258         case UNSTRUCTURED_VDMS:
1259         case STRUCTURED_VDMS:
1260                 break;
1261         default:
1262                 return false;
1263         }
1264
1265         return true;
1266 }
1267
1268 static bool tcpm_ams_interruptible(struct tcpm_port *port)
1269 {
1270         switch (port->ams) {
1271         /* Interruptible AMS */
1272         case NONE_AMS:
1273         case SECURITY:
1274         case FIRMWARE_UPDATE:
1275         case DISCOVER_IDENTITY:
1276         case SOURCE_STARTUP_CABLE_PLUG_DISCOVER_IDENTITY:
1277         case DISCOVER_SVIDS:
1278         case DISCOVER_MODES:
1279         case DFP_TO_UFP_ENTER_MODE:
1280         case DFP_TO_UFP_EXIT_MODE:
1281         case DFP_TO_CABLE_PLUG_ENTER_MODE:
1282         case DFP_TO_CABLE_PLUG_EXIT_MODE:
1283         case UNSTRUCTURED_VDMS:
1284         case STRUCTURED_VDMS:
1285         case COUNTRY_INFO:
1286         case COUNTRY_CODES:
1287                 break;
1288         /* Non-Interruptible AMS */
1289         default:
1290                 if (port->in_ams)
1291                         return false;
1292                 break;
1293         }
1294
1295         return true;
1296 }
1297
1298 static int tcpm_ams_start(struct tcpm_port *port, enum tcpm_ams ams)
1299 {
1300         int ret = 0;
1301
1302         tcpm_log(port, "AMS %s start", tcpm_ams_str[ams]);
1303
1304         if (!tcpm_ams_interruptible(port) &&
1305             !(ams == HARD_RESET || ams == SOFT_RESET_AMS)) {
1306                 port->upcoming_state = INVALID_STATE;
1307                 tcpm_log(port, "AMS %s not interruptible, aborting",
1308                          tcpm_ams_str[port->ams]);
1309                 return -EAGAIN;
1310         }
1311
1312         if (port->pwr_role == TYPEC_SOURCE) {
1313                 enum typec_cc_status cc_req = port->cc_req;
1314
1315                 port->ams = ams;
1316
1317                 if (ams == HARD_RESET) {
1318                         tcpm_set_cc(port, tcpm_rp_cc(port));
1319                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1320                         tcpm_set_state(port, HARD_RESET_START, 0);
1321                         return ret;
1322                 } else if (ams == SOFT_RESET_AMS) {
1323                         if (!port->explicit_contract)
1324                                 tcpm_set_cc(port, tcpm_rp_cc(port));
1325                         tcpm_set_state(port, SOFT_RESET_SEND, 0);
1326                         return ret;
1327                 } else if (tcpm_vdm_ams(port)) {
1328                         /* tSinkTx is enforced in vdm_run_state_machine */
1329                         if (port->negotiated_rev >= PD_REV30)
1330                                 tcpm_set_cc(port, SINK_TX_NG);
1331                         return ret;
1332                 }
1333
1334                 if (port->negotiated_rev >= PD_REV30)
1335                         tcpm_set_cc(port, SINK_TX_NG);
1336
1337                 switch (port->state) {
1338                 case SRC_READY:
1339                 case SRC_STARTUP:
1340                 case SRC_SOFT_RESET_WAIT_SNK_TX:
1341                 case SOFT_RESET:
1342                 case SOFT_RESET_SEND:
1343                         if (port->negotiated_rev >= PD_REV30)
1344                                 tcpm_set_state(port, AMS_START,
1345                                                cc_req == SINK_TX_OK ?
1346                                                PD_T_SINK_TX : 0);
1347                         else
1348                                 tcpm_set_state(port, AMS_START, 0);
1349                         break;
1350                 default:
1351                         if (port->negotiated_rev >= PD_REV30)
1352                                 tcpm_set_state(port, SRC_READY,
1353                                                cc_req == SINK_TX_OK ?
1354                                                PD_T_SINK_TX : 0);
1355                         else
1356                                 tcpm_set_state(port, SRC_READY, 0);
1357                         break;
1358                 }
1359         } else {
1360                 if (port->negotiated_rev >= PD_REV30 &&
1361                     !tcpm_sink_tx_ok(port) &&
1362                     ams != SOFT_RESET_AMS &&
1363                     ams != HARD_RESET) {
1364                         port->upcoming_state = INVALID_STATE;
1365                         tcpm_log(port, "Sink TX No Go");
1366                         return -EAGAIN;
1367                 }
1368
1369                 port->ams = ams;
1370
1371                 if (ams == HARD_RESET) {
1372                         tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
1373                         tcpm_set_state(port, HARD_RESET_START, 0);
1374                         return ret;
1375                 } else if (tcpm_vdm_ams(port)) {
1376                         return ret;
1377                 }
1378
1379                 if (port->state == SNK_READY ||
1380                     port->state == SNK_SOFT_RESET)
1381                         tcpm_set_state(port, AMS_START, 0);
1382                 else
1383                         tcpm_set_state(port, SNK_READY, 0);
1384         }
1385
1386         return ret;
1387 }
1388
1389 /*
1390  * VDM/VDO handling functions
1391  */
1392 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
1393                            const u32 *data, int cnt)
1394 {
1395         WARN_ON(!mutex_is_locked(&port->lock));
1396
1397         /* Make sure we are not still processing a previous VDM packet */
1398         WARN_ON(port->vdm_state > VDM_STATE_DONE);
1399
1400         port->vdo_count = cnt + 1;
1401         port->vdo_data[0] = header;
1402         memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
1403         /* Set ready, vdm state machine will actually send */
1404         port->vdm_retries = 0;
1405         port->vdm_state = VDM_STATE_READY;
1406
1407         mod_vdm_delayed_work(port, 0);
1408 }
1409
1410 static void tcpm_queue_vdm_unlocked(struct tcpm_port *port, const u32 header,
1411                                     const u32 *data, int cnt)
1412 {
1413         mutex_lock(&port->lock);
1414         tcpm_queue_vdm(port, header, data, cnt);
1415         mutex_unlock(&port->lock);
1416 }
1417
1418 static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt)
1419 {
1420         u32 vdo = p[VDO_INDEX_IDH];
1421         u32 product = p[VDO_INDEX_PRODUCT];
1422
1423         memset(&port->mode_data, 0, sizeof(port->mode_data));
1424
1425         port->partner_ident.id_header = vdo;
1426         port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT];
1427         port->partner_ident.product = product;
1428
1429         typec_partner_set_identity(port->partner);
1430
1431         tcpm_log(port, "Identity: %04x:%04x.%04x",
1432                  PD_IDH_VID(vdo),
1433                  PD_PRODUCT_PID(product), product & 0xffff);
1434 }
1435
1436 static bool svdm_consume_svids(struct tcpm_port *port, const u32 *p, int cnt)
1437 {
1438         struct pd_mode_data *pmdata = &port->mode_data;
1439         int i;
1440
1441         for (i = 1; i < cnt; i++) {
1442                 u16 svid;
1443
1444                 svid = (p[i] >> 16) & 0xffff;
1445                 if (!svid)
1446                         return false;
1447
1448                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1449                         goto abort;
1450
1451                 pmdata->svids[pmdata->nsvids++] = svid;
1452                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1453
1454                 svid = p[i] & 0xffff;
1455                 if (!svid)
1456                         return false;
1457
1458                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
1459                         goto abort;
1460
1461                 pmdata->svids[pmdata->nsvids++] = svid;
1462                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
1463         }
1464         return true;
1465 abort:
1466         tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
1467         return false;
1468 }
1469
1470 static void svdm_consume_modes(struct tcpm_port *port, const u32 *p, int cnt)
1471 {
1472         struct pd_mode_data *pmdata = &port->mode_data;
1473         struct typec_altmode_desc *paltmode;
1474         int i;
1475
1476         if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1477                 /* Already logged in svdm_consume_svids() */
1478                 return;
1479         }
1480
1481         for (i = 1; i < cnt; i++) {
1482                 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1483                 memset(paltmode, 0, sizeof(*paltmode));
1484
1485                 paltmode->svid = pmdata->svids[pmdata->svid_index];
1486                 paltmode->mode = i;
1487                 paltmode->vdo = p[i];
1488
1489                 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1490                          pmdata->altmodes, paltmode->svid,
1491                          paltmode->mode, paltmode->vdo);
1492
1493                 pmdata->altmodes++;
1494         }
1495 }
1496
1497 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1498 {
1499         struct pd_mode_data *modep = &port->mode_data;
1500         struct typec_altmode *altmode;
1501         int i;
1502
1503         for (i = 0; i < modep->altmodes; i++) {
1504                 altmode = typec_partner_register_altmode(port->partner,
1505                                                 &modep->altmode_desc[i]);
1506                 if (IS_ERR(altmode)) {
1507                         tcpm_log(port, "Failed to register partner SVID 0x%04x",
1508                                  modep->altmode_desc[i].svid);
1509                         altmode = NULL;
1510                 }
1511                 port->partner_altmode[i] = altmode;
1512         }
1513 }
1514
1515 #define supports_modal(port)    PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1516
1517 static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
1518                         const u32 *p, int cnt, u32 *response,
1519                         enum adev_actions *adev_action)
1520 {
1521         struct typec_port *typec = port->typec_port;
1522         struct typec_altmode *pdev;
1523         struct pd_mode_data *modep;
1524         int svdm_version;
1525         int rlen = 0;
1526         int cmd_type;
1527         int cmd;
1528         int i;
1529
1530         cmd_type = PD_VDO_CMDT(p[0]);
1531         cmd = PD_VDO_CMD(p[0]);
1532
1533         tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1534                  p[0], cmd_type, cmd, cnt);
1535
1536         modep = &port->mode_data;
1537
1538         pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1539                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1540
1541         svdm_version = typec_get_negotiated_svdm_version(typec);
1542         if (svdm_version < 0)
1543                 return 0;
1544
1545         switch (cmd_type) {
1546         case CMDT_INIT:
1547                 switch (cmd) {
1548                 case CMD_DISCOVER_IDENT:
1549                         if (PD_VDO_VID(p[0]) != USB_SID_PD)
1550                                 break;
1551
1552                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version) {
1553                                 typec_partner_set_svdm_version(port->partner,
1554                                                                PD_VDO_SVDM_VER(p[0]));
1555                                 svdm_version = PD_VDO_SVDM_VER(p[0]);
1556                         }
1557
1558                         port->ams = DISCOVER_IDENTITY;
1559                         /*
1560                          * PD2.0 Spec 6.10.3: respond with NAK as DFP (data host)
1561                          * PD3.1 Spec 6.4.4.2.5.1: respond with NAK if "invalid field" or
1562                          * "wrong configuation" or "Unrecognized"
1563                          */
1564                         if ((port->data_role == TYPEC_DEVICE || svdm_version >= SVDM_VER_2_0) &&
1565                             port->nr_snk_vdo) {
1566                                 if (svdm_version < SVDM_VER_2_0) {
1567                                         for (i = 0; i < port->nr_snk_vdo_v1; i++)
1568                                                 response[i + 1] = port->snk_vdo_v1[i];
1569                                         rlen = port->nr_snk_vdo_v1 + 1;
1570
1571                                 } else {
1572                                         for (i = 0; i < port->nr_snk_vdo; i++)
1573                                                 response[i + 1] = port->snk_vdo[i];
1574                                         rlen = port->nr_snk_vdo + 1;
1575                                 }
1576                         }
1577                         break;
1578                 case CMD_DISCOVER_SVID:
1579                         port->ams = DISCOVER_SVIDS;
1580                         break;
1581                 case CMD_DISCOVER_MODES:
1582                         port->ams = DISCOVER_MODES;
1583                         break;
1584                 case CMD_ENTER_MODE:
1585                         port->ams = DFP_TO_UFP_ENTER_MODE;
1586                         break;
1587                 case CMD_EXIT_MODE:
1588                         port->ams = DFP_TO_UFP_EXIT_MODE;
1589                         break;
1590                 case CMD_ATTENTION:
1591                         /* Attention command does not have response */
1592                         *adev_action = ADEV_ATTENTION;
1593                         return 0;
1594                 default:
1595                         break;
1596                 }
1597                 if (rlen >= 1) {
1598                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1599                 } else if (rlen == 0) {
1600                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1601                         rlen = 1;
1602                 } else {
1603                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1604                         rlen = 1;
1605                 }
1606                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1607                               (VDO_SVDM_VERS(typec_get_negotiated_svdm_version(typec)));
1608                 break;
1609         case CMDT_RSP_ACK:
1610                 /* silently drop message if we are not connected */
1611                 if (IS_ERR_OR_NULL(port->partner))
1612                         break;
1613
1614                 tcpm_ams_finish(port);
1615
1616                 switch (cmd) {
1617                 case CMD_DISCOVER_IDENT:
1618                         if (PD_VDO_SVDM_VER(p[0]) < svdm_version)
1619                                 typec_partner_set_svdm_version(port->partner,
1620                                                                PD_VDO_SVDM_VER(p[0]));
1621                         /* 6.4.4.3.1 */
1622                         svdm_consume_identity(port, p, cnt);
1623                         response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
1624                                           CMD_DISCOVER_SVID);
1625                         rlen = 1;
1626                         break;
1627                 case CMD_DISCOVER_SVID:
1628                         /* 6.4.4.3.2 */
1629                         if (svdm_consume_svids(port, p, cnt)) {
1630                                 response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
1631                                 rlen = 1;
1632                         } else if (modep->nsvids && supports_modal(port)) {
1633                                 response[0] = VDO(modep->svids[0], 1, svdm_version,
1634                                                   CMD_DISCOVER_MODES);
1635                                 rlen = 1;
1636                         }
1637                         break;
1638                 case CMD_DISCOVER_MODES:
1639                         /* 6.4.4.3.3 */
1640                         svdm_consume_modes(port, p, cnt);
1641                         modep->svid_index++;
1642                         if (modep->svid_index < modep->nsvids) {
1643                                 u16 svid = modep->svids[modep->svid_index];
1644                                 response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
1645                                 rlen = 1;
1646                         } else {
1647                                 tcpm_register_partner_altmodes(port);
1648                                 port->vdm_sm_running = false;
1649                         }
1650                         break;
1651                 case CMD_ENTER_MODE:
1652                         if (adev && pdev) {
1653                                 typec_altmode_update_active(pdev, true);
1654                                 *adev_action = ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL;
1655                         }
1656                         return 0;
1657                 case CMD_EXIT_MODE:
1658                         if (adev && pdev) {
1659                                 typec_altmode_update_active(pdev, false);
1660                                 /* Back to USB Operation */
1661                                 *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1662                                 return 0;
1663                         }
1664                         break;
1665                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1666                         break;
1667                 default:
1668                         /* Unrecognized SVDM */
1669                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1670                         rlen = 1;
1671                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1672                                       (VDO_SVDM_VERS(svdm_version));
1673                         break;
1674                 }
1675                 break;
1676         case CMDT_RSP_NAK:
1677                 tcpm_ams_finish(port);
1678                 switch (cmd) {
1679                 case CMD_DISCOVER_IDENT:
1680                 case CMD_DISCOVER_SVID:
1681                 case CMD_DISCOVER_MODES:
1682                 case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1683                         break;
1684                 case CMD_ENTER_MODE:
1685                         /* Back to USB Operation */
1686                         *adev_action = ADEV_NOTIFY_USB_AND_QUEUE_VDM;
1687                         return 0;
1688                 default:
1689                         /* Unrecognized SVDM */
1690                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1691                         rlen = 1;
1692                         response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1693                                       (VDO_SVDM_VERS(svdm_version));
1694                         break;
1695                 }
1696                 port->vdm_sm_running = false;
1697                 break;
1698         default:
1699                 response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1700                 rlen = 1;
1701                 response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
1702                               (VDO_SVDM_VERS(svdm_version));
1703                 port->vdm_sm_running = false;
1704                 break;
1705         }
1706
1707         /* Informing the alternate mode drivers about everything */
1708         *adev_action = ADEV_QUEUE_VDM;
1709         return rlen;
1710 }
1711
1712 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1713                                     const __le32 *payload, int cnt)
1714 {
1715         enum adev_actions adev_action = ADEV_NONE;
1716         struct typec_altmode *adev;
1717         u32 p[PD_MAX_PAYLOAD];
1718         u32 response[8] = { };
1719         int i, rlen = 0;
1720
1721         for (i = 0; i < cnt; i++)
1722                 p[i] = le32_to_cpu(payload[i]);
1723
1724         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1725                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1726
1727         if (port->vdm_state == VDM_STATE_BUSY) {
1728                 /* If UFP responded busy retry after timeout */
1729                 if (PD_VDO_CMDT(p[0]) == CMDT_RSP_BUSY) {
1730                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1731                         port->vdo_retry = (p[0] & ~VDO_CMDT_MASK) |
1732                                 CMDT_INIT;
1733                         mod_vdm_delayed_work(port, PD_T_VDM_BUSY);
1734                         return;
1735                 }
1736                 port->vdm_state = VDM_STATE_DONE;
1737         }
1738
1739         if (PD_VDO_SVDM(p[0])) {
1740                 rlen = tcpm_pd_svdm(port, adev, p, cnt, response, &adev_action);
1741         } else {
1742                 if (port->negotiated_rev >= PD_REV30)
1743                         tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1744         }
1745
1746         /*
1747          * We are done with any state stored in the port struct now, except
1748          * for any port struct changes done by the tcpm_queue_vdm() call
1749          * below, which is a separate operation.
1750          *
1751          * So we can safely release the lock here; and we MUST release the
1752          * lock here to avoid an AB BA lock inversion:
1753          *
1754          * If we keep the lock here then the lock ordering in this path is:
1755          * 1. tcpm_pd_rx_handler take the tcpm port lock
1756          * 2. One of the typec_altmode_* calls below takes the alt-mode's lock
1757          *
1758          * And we also have this ordering:
1759          * 1. alt-mode driver takes the alt-mode's lock
1760          * 2. alt-mode driver calls tcpm_altmode_enter which takes the
1761          *    tcpm port lock
1762          *
1763          * Dropping our lock here avoids this.
1764          */
1765         mutex_unlock(&port->lock);
1766
1767         if (adev) {
1768                 switch (adev_action) {
1769                 case ADEV_NONE:
1770                         break;
1771                 case ADEV_NOTIFY_USB_AND_QUEUE_VDM:
1772                         WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB, NULL));
1773                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1774                         break;
1775                 case ADEV_QUEUE_VDM:
1776                         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1777                         break;
1778                 case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
1779                         if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1780                                 int svdm_version = typec_get_negotiated_svdm_version(
1781                                                                         port->typec_port);
1782                                 if (svdm_version < 0)
1783                                         break;
1784
1785                                 response[0] = VDO(adev->svid, 1, svdm_version,
1786                                                   CMD_EXIT_MODE);
1787                                 response[0] |= VDO_OPOS(adev->mode);
1788                                 rlen = 1;
1789                         }
1790                         break;
1791                 case ADEV_ATTENTION:
1792                         typec_altmode_attention(adev, p[1]);
1793                         break;
1794                 }
1795         }
1796
1797         /*
1798          * We must re-take the lock here to balance the unlock in
1799          * tcpm_pd_rx_handler, note that no changes, other then the
1800          * tcpm_queue_vdm call, are made while the lock is held again.
1801          * All that is done after the call is unwinding the call stack until
1802          * we return to tcpm_pd_rx_handler and do the unlock there.
1803          */
1804         mutex_lock(&port->lock);
1805
1806         if (rlen > 0)
1807                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1808 }
1809
1810 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1811                           const u32 *data, int count)
1812 {
1813         int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
1814         u32 header;
1815
1816         if (svdm_version < 0)
1817                 return;
1818
1819         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1820                 count = VDO_MAX_SIZE - 1;
1821
1822         /* set VDM header with VID & CMD */
1823         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1824                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
1825                         svdm_version, cmd);
1826         tcpm_queue_vdm(port, header, data, count);
1827 }
1828
1829 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1830 {
1831         unsigned int timeout;
1832         int cmd = PD_VDO_CMD(vdm_hdr);
1833
1834         /* its not a structured VDM command */
1835         if (!PD_VDO_SVDM(vdm_hdr))
1836                 return PD_T_VDM_UNSTRUCTURED;
1837
1838         switch (PD_VDO_CMDT(vdm_hdr)) {
1839         case CMDT_INIT:
1840                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1841                         timeout = PD_T_VDM_WAIT_MODE_E;
1842                 else
1843                         timeout = PD_T_VDM_SNDR_RSP;
1844                 break;
1845         default:
1846                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1847                         timeout = PD_T_VDM_E_MODE;
1848                 else
1849                         timeout = PD_T_VDM_RCVR_RSP;
1850                 break;
1851         }
1852         return timeout;
1853 }
1854
1855 static void vdm_run_state_machine(struct tcpm_port *port)
1856 {
1857         struct pd_message msg;
1858         int i, res = 0;
1859         u32 vdo_hdr = port->vdo_data[0];
1860
1861         switch (port->vdm_state) {
1862         case VDM_STATE_READY:
1863                 /* Only transmit VDM if attached */
1864                 if (!port->attached) {
1865                         port->vdm_state = VDM_STATE_ERR_BUSY;
1866                         break;
1867                 }
1868
1869                 /*
1870                  * if there's traffic or we're not in PDO ready state don't send
1871                  * a VDM.
1872                  */
1873                 if (port->state != SRC_READY && port->state != SNK_READY)
1874                         break;
1875
1876                 /* TODO: AMS operation for Unstructured VDM */
1877                 if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) {
1878                         switch (PD_VDO_CMD(vdo_hdr)) {
1879                         case CMD_DISCOVER_IDENT:
1880                                 res = tcpm_ams_start(port, DISCOVER_IDENTITY);
1881                                 if (res == 0)
1882                                         port->send_discover = false;
1883                                 else if (res == -EAGAIN)
1884                                         mod_send_discover_delayed_work(port,
1885                                                                        SEND_DISCOVER_RETRY_MS);
1886                                 break;
1887                         case CMD_DISCOVER_SVID:
1888                                 res = tcpm_ams_start(port, DISCOVER_SVIDS);
1889                                 break;
1890                         case CMD_DISCOVER_MODES:
1891                                 res = tcpm_ams_start(port, DISCOVER_MODES);
1892                                 break;
1893                         case CMD_ENTER_MODE:
1894                                 res = tcpm_ams_start(port, DFP_TO_UFP_ENTER_MODE);
1895                                 break;
1896                         case CMD_EXIT_MODE:
1897                                 res = tcpm_ams_start(port, DFP_TO_UFP_EXIT_MODE);
1898                                 break;
1899                         case CMD_ATTENTION:
1900                                 res = tcpm_ams_start(port, ATTENTION);
1901                                 break;
1902                         case VDO_CMD_VENDOR(0) ... VDO_CMD_VENDOR(15):
1903                                 res = tcpm_ams_start(port, STRUCTURED_VDMS);
1904                                 break;
1905                         default:
1906                                 res = -EOPNOTSUPP;
1907                                 break;
1908                         }
1909
1910                         if (res < 0) {
1911                                 port->vdm_state = VDM_STATE_ERR_BUSY;
1912                                 return;
1913                         }
1914                 }
1915
1916                 port->vdm_state = VDM_STATE_SEND_MESSAGE;
1917                 mod_vdm_delayed_work(port, (port->negotiated_rev >= PD_REV30 &&
1918                                             port->pwr_role == TYPEC_SOURCE &&
1919                                             PD_VDO_SVDM(vdo_hdr) &&
1920                                             PD_VDO_CMDT(vdo_hdr) == CMDT_INIT) ?
1921                                            PD_T_SINK_TX : 0);
1922                 break;
1923         case VDM_STATE_WAIT_RSP_BUSY:
1924                 port->vdo_data[0] = port->vdo_retry;
1925                 port->vdo_count = 1;
1926                 port->vdm_state = VDM_STATE_READY;
1927                 tcpm_ams_finish(port);
1928                 break;
1929         case VDM_STATE_BUSY:
1930                 port->vdm_state = VDM_STATE_ERR_TMOUT;
1931                 if (port->ams != NONE_AMS)
1932                         tcpm_ams_finish(port);
1933                 break;
1934         case VDM_STATE_ERR_SEND:
1935                 /*
1936                  * A partner which does not support USB PD will not reply,
1937                  * so this is not a fatal error. At the same time, some
1938                  * devices may not return GoodCRC under some circumstances,
1939                  * so we need to retry.
1940                  */
1941                 if (port->vdm_retries < 3) {
1942                         tcpm_log(port, "VDM Tx error, retry");
1943                         port->vdm_retries++;
1944                         port->vdm_state = VDM_STATE_READY;
1945                         if (PD_VDO_SVDM(vdo_hdr) && PD_VDO_CMDT(vdo_hdr) == CMDT_INIT)
1946                                 tcpm_ams_finish(port);
1947                 } else {
1948                         tcpm_ams_finish(port);
1949                 }
1950                 break;
1951         case VDM_STATE_SEND_MESSAGE:
1952                 /* Prepare and send VDM */
1953                 memset(&msg, 0, sizeof(msg));
1954                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1955                                           port->pwr_role,
1956                                           port->data_role,
1957                                           port->negotiated_rev,
1958                                           port->message_id, port->vdo_count);
1959                 for (i = 0; i < port->vdo_count; i++)
1960                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1961                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1962                 if (res < 0) {
1963                         port->vdm_state = VDM_STATE_ERR_SEND;
1964                 } else {
1965                         unsigned long timeout;
1966
1967                         port->vdm_retries = 0;
1968                         port->vdm_state = VDM_STATE_BUSY;
1969                         timeout = vdm_ready_timeout(vdo_hdr);
1970                         mod_vdm_delayed_work(port, timeout);
1971                 }
1972                 break;
1973         default:
1974                 break;
1975         }
1976 }
1977
1978 static void vdm_state_machine_work(struct kthread_work *work)
1979 {
1980         struct tcpm_port *port = container_of(work, struct tcpm_port, vdm_state_machine);
1981         enum vdm_states prev_state;
1982
1983         mutex_lock(&port->lock);
1984
1985         /*
1986          * Continue running as long as the port is not busy and there was
1987          * a state change.
1988          */
1989         do {
1990                 prev_state = port->vdm_state;
1991                 vdm_run_state_machine(port);
1992         } while (port->vdm_state != prev_state &&
1993                  port->vdm_state != VDM_STATE_BUSY &&
1994                  port->vdm_state != VDM_STATE_SEND_MESSAGE);
1995
1996         if (port->vdm_state < VDM_STATE_READY)
1997                 port->vdm_sm_running = false;
1998
1999         mutex_unlock(&port->lock);
2000 }
2001
2002 enum pdo_err {
2003         PDO_NO_ERR,
2004         PDO_ERR_NO_VSAFE5V,
2005         PDO_ERR_VSAFE5V_NOT_FIRST,
2006         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
2007         PDO_ERR_FIXED_NOT_SORTED,
2008         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
2009         PDO_ERR_DUPE_PDO,
2010         PDO_ERR_PPS_APDO_NOT_SORTED,
2011         PDO_ERR_DUPE_PPS_APDO,
2012 };
2013
2014 static const char * const pdo_err_msg[] = {
2015         [PDO_ERR_NO_VSAFE5V] =
2016         " err: source/sink caps should atleast have vSafe5V",
2017         [PDO_ERR_VSAFE5V_NOT_FIRST] =
2018         " err: vSafe5V Fixed Supply Object Shall always be the first object",
2019         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
2020         " err: PDOs should be in the following order: Fixed; Battery; Variable",
2021         [PDO_ERR_FIXED_NOT_SORTED] =
2022         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
2023         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
2024         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
2025         [PDO_ERR_DUPE_PDO] =
2026         " err: Variable/Batt supply pdos cannot have same min/max voltage",
2027         [PDO_ERR_PPS_APDO_NOT_SORTED] =
2028         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
2029         [PDO_ERR_DUPE_PPS_APDO] =
2030         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
2031 };
2032
2033 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
2034                                   unsigned int nr_pdo)
2035 {
2036         unsigned int i;
2037
2038         /* Should at least contain vSafe5v */
2039         if (nr_pdo < 1)
2040                 return PDO_ERR_NO_VSAFE5V;
2041
2042         /* The vSafe5V Fixed Supply Object Shall always be the first object */
2043         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
2044             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
2045                 return PDO_ERR_VSAFE5V_NOT_FIRST;
2046
2047         for (i = 1; i < nr_pdo; i++) {
2048                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
2049                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
2050                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
2051                         enum pd_pdo_type type = pdo_type(pdo[i]);
2052
2053                         switch (type) {
2054                         /*
2055                          * The remaining Fixed Supply Objects, if
2056                          * present, shall be sent in voltage order;
2057                          * lowest to highest.
2058                          */
2059                         case PDO_TYPE_FIXED:
2060                                 if (pdo_fixed_voltage(pdo[i]) <=
2061                                     pdo_fixed_voltage(pdo[i - 1]))
2062                                         return PDO_ERR_FIXED_NOT_SORTED;
2063                                 break;
2064                         /*
2065                          * The Battery Supply Objects and Variable
2066                          * supply, if present shall be sent in Minimum
2067                          * Voltage order; lowest to highest.
2068                          */
2069                         case PDO_TYPE_VAR:
2070                         case PDO_TYPE_BATT:
2071                                 if (pdo_min_voltage(pdo[i]) <
2072                                     pdo_min_voltage(pdo[i - 1]))
2073                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
2074                                 else if ((pdo_min_voltage(pdo[i]) ==
2075                                           pdo_min_voltage(pdo[i - 1])) &&
2076                                          (pdo_max_voltage(pdo[i]) ==
2077                                           pdo_max_voltage(pdo[i - 1])))
2078                                         return PDO_ERR_DUPE_PDO;
2079                                 break;
2080                         /*
2081                          * The Programmable Power Supply APDOs, if present,
2082                          * shall be sent in Maximum Voltage order;
2083                          * lowest to highest.
2084                          */
2085                         case PDO_TYPE_APDO:
2086                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
2087                                         break;
2088
2089                                 if (pdo_pps_apdo_max_voltage(pdo[i]) <
2090                                     pdo_pps_apdo_max_voltage(pdo[i - 1]))
2091                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
2092                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
2093                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
2094                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
2095                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
2096                                          pdo_pps_apdo_max_current(pdo[i]) ==
2097                                           pdo_pps_apdo_max_current(pdo[i - 1]))
2098                                         return PDO_ERR_DUPE_PPS_APDO;
2099                                 break;
2100                         default:
2101                                 tcpm_log_force(port, " Unknown pdo type");
2102                         }
2103                 }
2104         }
2105
2106         return PDO_NO_ERR;
2107 }
2108
2109 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
2110                               unsigned int nr_pdo)
2111 {
2112         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
2113
2114         if (err_index != PDO_NO_ERR) {
2115                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
2116                 return -EINVAL;
2117         }
2118
2119         return 0;
2120 }
2121
2122 static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
2123 {
2124         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2125         int svdm_version;
2126         u32 header;
2127
2128         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2129         if (svdm_version < 0)
2130                 return svdm_version;
2131
2132         header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
2133         header |= VDO_OPOS(altmode->mode);
2134
2135         tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
2136         return 0;
2137 }
2138
2139 static int tcpm_altmode_exit(struct typec_altmode *altmode)
2140 {
2141         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2142         int svdm_version;
2143         u32 header;
2144
2145         svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
2146         if (svdm_version < 0)
2147                 return svdm_version;
2148
2149         header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
2150         header |= VDO_OPOS(altmode->mode);
2151
2152         tcpm_queue_vdm_unlocked(port, header, NULL, 0);
2153         return 0;
2154 }
2155
2156 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
2157                             u32 header, const u32 *data, int count)
2158 {
2159         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
2160
2161         tcpm_queue_vdm_unlocked(port, header, data, count - 1);
2162
2163         return 0;
2164 }
2165
2166 static const struct typec_altmode_ops tcpm_altmode_ops = {
2167         .enter = tcpm_altmode_enter,
2168         .exit = tcpm_altmode_exit,
2169         .vdm = tcpm_altmode_vdm,
2170 };
2171
2172 /*
2173  * PD (data, control) command handling functions
2174  */
2175 static inline enum tcpm_state ready_state(struct tcpm_port *port)
2176 {
2177         if (port->pwr_role == TYPEC_SOURCE)
2178                 return SRC_READY;
2179         else
2180                 return SNK_READY;
2181 }
2182
2183 static int tcpm_pd_send_control(struct tcpm_port *port,
2184                                 enum pd_ctrl_msg_type type);
2185
2186 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
2187                               int cnt)
2188 {
2189         u32 p0 = le32_to_cpu(payload[0]);
2190         unsigned int type = usb_pd_ado_type(p0);
2191
2192         if (!type) {
2193                 tcpm_log(port, "Alert message received with no type");
2194                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2195                 return;
2196         }
2197
2198         /* Just handling non-battery alerts for now */
2199         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
2200                 if (port->pwr_role == TYPEC_SOURCE) {
2201                         port->upcoming_state = GET_STATUS_SEND;
2202                         tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
2203                 } else {
2204                         /*
2205                          * Do not check SinkTxOk here in case the Source doesn't set its Rp to
2206                          * SinkTxOk in time.
2207                          */
2208                         port->ams = GETTING_SOURCE_SINK_STATUS;
2209                         tcpm_set_state(port, GET_STATUS_SEND, 0);
2210                 }
2211         } else {
2212                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
2213         }
2214 }
2215
2216 static int tcpm_set_auto_vbus_discharge_threshold(struct tcpm_port *port,
2217                                                   enum typec_pwr_opmode mode, bool pps_active,
2218                                                   u32 requested_vbus_voltage)
2219 {
2220         int ret;
2221
2222         if (!port->tcpc->set_auto_vbus_discharge_threshold)
2223                 return 0;
2224
2225         ret = port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, pps_active,
2226                                                             requested_vbus_voltage);
2227         tcpm_log_force(port,
2228                        "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u ret:%d",
2229                        mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret);
2230
2231         return ret;
2232 }
2233
2234 static void tcpm_pd_handle_state(struct tcpm_port *port,
2235                                  enum tcpm_state state,
2236                                  enum tcpm_ams ams,
2237                                  unsigned int delay_ms)
2238 {
2239         switch (port->state) {
2240         case SRC_READY:
2241         case SNK_READY:
2242                 port->ams = ams;
2243                 tcpm_set_state(port, state, delay_ms);
2244                 break;
2245         /* 8.3.3.4.1.1 and 6.8.1 power transitioning */
2246         case SNK_TRANSITION_SINK:
2247         case SNK_TRANSITION_SINK_VBUS:
2248         case SRC_TRANSITION_SUPPLY:
2249                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2250                 break;
2251         default:
2252                 if (!tcpm_ams_interruptible(port)) {
2253                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2254                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2255                                        SNK_SOFT_RESET,
2256                                        0);
2257                 } else {
2258                         /* process the Message 6.8.1 */
2259                         port->upcoming_state = state;
2260                         port->next_ams = ams;
2261                         tcpm_set_state(port, ready_state(port), delay_ms);
2262                 }
2263                 break;
2264         }
2265 }
2266
2267 static void tcpm_pd_handle_msg(struct tcpm_port *port,
2268                                enum pd_msg_request message,
2269                                enum tcpm_ams ams)
2270 {
2271         switch (port->state) {
2272         case SRC_READY:
2273         case SNK_READY:
2274                 port->ams = ams;
2275                 tcpm_queue_message(port, message);
2276                 break;
2277         /* PD 3.0 Spec 8.3.3.4.1.1 and 6.8.1 */
2278         case SNK_TRANSITION_SINK:
2279         case SNK_TRANSITION_SINK_VBUS:
2280         case SRC_TRANSITION_SUPPLY:
2281                 tcpm_set_state(port, HARD_RESET_SEND, 0);
2282                 break;
2283         default:
2284                 if (!tcpm_ams_interruptible(port)) {
2285                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
2286                                        SRC_SOFT_RESET_WAIT_SNK_TX :
2287                                        SNK_SOFT_RESET,
2288                                        0);
2289                 } else {
2290                         port->next_ams = ams;
2291                         tcpm_set_state(port, ready_state(port), 0);
2292                         /* 6.8.1 process the Message */
2293                         tcpm_queue_message(port, message);
2294                 }
2295                 break;
2296         }
2297 }
2298
2299 static void tcpm_pd_data_request(struct tcpm_port *port,
2300                                  const struct pd_message *msg)
2301 {
2302         enum pd_data_msg_type type = pd_header_type_le(msg->header);
2303         unsigned int cnt = pd_header_cnt_le(msg->header);
2304         unsigned int rev = pd_header_rev_le(msg->header);
2305         unsigned int i;
2306         enum frs_typec_current partner_frs_current;
2307         bool frs_enable;
2308         int ret;
2309
2310         if (tcpm_vdm_ams(port) && type != PD_DATA_VENDOR_DEF) {
2311                 port->vdm_state = VDM_STATE_ERR_BUSY;
2312                 tcpm_ams_finish(port);
2313                 mod_vdm_delayed_work(port, 0);
2314         }
2315
2316         switch (type) {
2317         case PD_DATA_SOURCE_CAP:
2318                 for (i = 0; i < cnt; i++)
2319                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
2320
2321                 port->nr_source_caps = cnt;
2322
2323                 tcpm_log_source_caps(port);
2324
2325                 tcpm_validate_caps(port, port->source_caps,
2326                                    port->nr_source_caps);
2327
2328                 /*
2329                  * Adjust revision in subsequent message headers, as required,
2330                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2331                  * support Rev 1.0 so just do nothing in that scenario.
2332                  */
2333                 if (rev == PD_REV10) {
2334                         if (port->ams == GET_SOURCE_CAPABILITIES)
2335                                 tcpm_ams_finish(port);
2336                         break;
2337                 }
2338
2339                 if (rev < PD_MAX_REV)
2340                         port->negotiated_rev = rev;
2341
2342                 if (port->pwr_role == TYPEC_SOURCE) {
2343                         if (port->ams == GET_SOURCE_CAPABILITIES)
2344                                 tcpm_pd_handle_state(port, SRC_READY, NONE_AMS, 0);
2345                         /* Unexpected Source Capabilities */
2346                         else
2347                                 tcpm_pd_handle_msg(port,
2348                                                    port->negotiated_rev < PD_REV30 ?
2349                                                    PD_MSG_CTRL_REJECT :
2350                                                    PD_MSG_CTRL_NOT_SUPP,
2351                                                    NONE_AMS);
2352                 } else if (port->state == SNK_WAIT_CAPABILITIES) {
2353                 /*
2354                  * This message may be received even if VBUS is not
2355                  * present. This is quite unexpected; see USB PD
2356                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
2357                  * However, at the same time, we must be ready to
2358                  * receive this message and respond to it 15ms after
2359                  * receiving PS_RDY during power swap operations, no matter
2360                  * if VBUS is available or not (USB PD specification,
2361                  * section 6.5.9.2).
2362                  * So we need to accept the message either way,
2363                  * but be prepared to keep waiting for VBUS after it was
2364                  * handled.
2365                  */
2366                         port->ams = POWER_NEGOTIATION;
2367                         port->in_ams = true;
2368                         tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
2369                 } else {
2370                         if (port->ams == GET_SOURCE_CAPABILITIES)
2371                                 tcpm_ams_finish(port);
2372                         tcpm_pd_handle_state(port, SNK_NEGOTIATE_CAPABILITIES,
2373                                              POWER_NEGOTIATION, 0);
2374                 }
2375                 break;
2376         case PD_DATA_REQUEST:
2377                 /*
2378                  * Adjust revision in subsequent message headers, as required,
2379                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
2380                  * support Rev 1.0 so just reject in that scenario.
2381                  */
2382                 if (rev == PD_REV10) {
2383                         tcpm_pd_handle_msg(port,
2384                                            port->negotiated_rev < PD_REV30 ?
2385                                            PD_MSG_CTRL_REJECT :
2386                                            PD_MSG_CTRL_NOT_SUPP,
2387                                            NONE_AMS);
2388                         break;
2389                 }
2390
2391                 if (rev < PD_MAX_REV)
2392                         port->negotiated_rev = rev;
2393
2394                 if (port->pwr_role != TYPEC_SOURCE || cnt != 1) {
2395                         tcpm_pd_handle_msg(port,
2396                                            port->negotiated_rev < PD_REV30 ?
2397                                            PD_MSG_CTRL_REJECT :
2398                                            PD_MSG_CTRL_NOT_SUPP,
2399                                            NONE_AMS);
2400                         break;
2401                 }
2402
2403                 port->sink_request = le32_to_cpu(msg->payload[0]);
2404
2405                 if (port->vdm_sm_running && port->explicit_contract) {
2406                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_WAIT, port->ams);
2407                         break;
2408                 }
2409
2410                 if (port->state == SRC_SEND_CAPABILITIES)
2411                         tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
2412                 else
2413                         tcpm_pd_handle_state(port, SRC_NEGOTIATE_CAPABILITIES,
2414                                              POWER_NEGOTIATION, 0);
2415                 break;
2416         case PD_DATA_SINK_CAP:
2417                 /* We don't do anything with this at the moment... */
2418                 for (i = 0; i < cnt; i++)
2419                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
2420
2421                 partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
2422                         PDO_FIXED_FRS_CURR_SHIFT;
2423                 frs_enable = partner_frs_current && (partner_frs_current <=
2424                                                      port->new_source_frs_current);
2425                 tcpm_log(port,
2426                          "Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
2427                          partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
2428                 if (frs_enable) {
2429                         ret  = port->tcpc->enable_frs(port->tcpc, true);
2430                         tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
2431                 }
2432
2433                 port->nr_sink_caps = cnt;
2434                 port->sink_cap_done = true;
2435                 if (port->ams == GET_SINK_CAPABILITIES)
2436                         tcpm_set_state(port, ready_state(port), 0);
2437                 /* Unexpected Sink Capabilities */
2438                 else
2439                         tcpm_pd_handle_msg(port,
2440                                            port->negotiated_rev < PD_REV30 ?
2441                                            PD_MSG_CTRL_REJECT :
2442                                            PD_MSG_CTRL_NOT_SUPP,
2443                                            NONE_AMS);
2444                 break;
2445         case PD_DATA_VENDOR_DEF:
2446                 if (tcpm_vdm_ams(port) || port->nr_snk_vdo)
2447                         tcpm_handle_vdm_request(port, msg->payload, cnt);
2448                 else if (port->negotiated_rev > PD_REV20)
2449                         tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2450                 break;
2451         case PD_DATA_BIST:
2452                 port->bist_request = le32_to_cpu(msg->payload[0]);
2453                 tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
2454                 break;
2455         case PD_DATA_ALERT:
2456                 if (port->state != SRC_READY && port->state != SNK_READY)
2457                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2458                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2459                                              NONE_AMS, 0);
2460                 else
2461                         tcpm_handle_alert(port, msg->payload, cnt);
2462                 break;
2463         case PD_DATA_BATT_STATUS:
2464         case PD_DATA_GET_COUNTRY_INFO:
2465                 /* Currently unsupported */
2466                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2467                                    PD_MSG_CTRL_REJECT :
2468                                    PD_MSG_CTRL_NOT_SUPP,
2469                                    NONE_AMS);
2470                 break;
2471         default:
2472                 tcpm_pd_handle_msg(port, port->negotiated_rev < PD_REV30 ?
2473                                    PD_MSG_CTRL_REJECT :
2474                                    PD_MSG_CTRL_NOT_SUPP,
2475                                    NONE_AMS);
2476                 tcpm_log(port, "Unrecognized data message type %#x", type);
2477                 break;
2478         }
2479 }
2480
2481 static void tcpm_pps_complete(struct tcpm_port *port, int result)
2482 {
2483         if (port->pps_pending) {
2484                 port->pps_status = result;
2485                 port->pps_pending = false;
2486                 complete(&port->pps_complete);
2487         }
2488 }
2489
2490 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
2491                                  const struct pd_message *msg)
2492 {
2493         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2494         enum tcpm_state next_state;
2495
2496         /*
2497          * Stop VDM state machine if interrupted by other Messages while NOT_SUPP is allowed in
2498          * VDM AMS if waiting for VDM responses and will be handled later.
2499          */
2500         if (tcpm_vdm_ams(port) && type != PD_CTRL_NOT_SUPP && type != PD_CTRL_GOOD_CRC) {
2501                 port->vdm_state = VDM_STATE_ERR_BUSY;
2502                 tcpm_ams_finish(port);
2503                 mod_vdm_delayed_work(port, 0);
2504         }
2505
2506         switch (type) {
2507         case PD_CTRL_GOOD_CRC:
2508         case PD_CTRL_PING:
2509                 break;
2510         case PD_CTRL_GET_SOURCE_CAP:
2511                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SOURCE_CAP, GET_SOURCE_CAPABILITIES);
2512                 break;
2513         case PD_CTRL_GET_SINK_CAP:
2514                 tcpm_pd_handle_msg(port, PD_MSG_DATA_SINK_CAP, GET_SINK_CAPABILITIES);
2515                 break;
2516         case PD_CTRL_GOTO_MIN:
2517                 break;
2518         case PD_CTRL_PS_RDY:
2519                 switch (port->state) {
2520                 case SNK_TRANSITION_SINK:
2521                         if (port->vbus_present) {
2522                                 tcpm_set_current_limit(port,
2523                                                        port->req_current_limit,
2524                                                        port->req_supply_voltage);
2525                                 port->explicit_contract = true;
2526                                 tcpm_set_auto_vbus_discharge_threshold(port,
2527                                                                        TYPEC_PWR_MODE_PD,
2528                                                                        port->pps_data.active,
2529                                                                        port->supply_voltage);
2530                                 /* Set VDM running flag ASAP */
2531                                 if (port->data_role == TYPEC_HOST &&
2532                                     port->send_discover)
2533                                         port->vdm_sm_running = true;
2534                                 tcpm_set_state(port, SNK_READY, 0);
2535                         } else {
2536                                 /*
2537                                  * Seen after power swap. Keep waiting for VBUS
2538                                  * in a transitional state.
2539                                  */
2540                                 tcpm_set_state(port,
2541                                                SNK_TRANSITION_SINK_VBUS, 0);
2542                         }
2543                         break;
2544                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
2545                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
2546                         break;
2547                 case PR_SWAP_SNK_SRC_SINK_OFF:
2548                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
2549                         break;
2550                 case VCONN_SWAP_WAIT_FOR_VCONN:
2551                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
2552                         break;
2553                 case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
2554                         tcpm_set_state(port, FR_SWAP_SNK_SRC_NEW_SINK_READY, 0);
2555                         break;
2556                 default:
2557                         tcpm_pd_handle_state(port,
2558                                              port->pwr_role == TYPEC_SOURCE ?
2559                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2560                                              SNK_SOFT_RESET,
2561                                              NONE_AMS, 0);
2562                         break;
2563                 }
2564                 break;
2565         case PD_CTRL_REJECT:
2566         case PD_CTRL_WAIT:
2567         case PD_CTRL_NOT_SUPP:
2568                 switch (port->state) {
2569                 case SNK_NEGOTIATE_CAPABILITIES:
2570                         /* USB PD specification, Figure 8-43 */
2571                         if (port->explicit_contract) {
2572                                 next_state = SNK_READY;
2573                                 if (port->data_role == TYPEC_HOST &&
2574                                     port->send_discover)
2575                                         port->vdm_sm_running = true;
2576                         } else {
2577                                 next_state = SNK_WAIT_CAPABILITIES;
2578                         }
2579                         tcpm_set_state(port, next_state, 0);
2580                         break;
2581                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2582                         /* Revert data back from any requested PPS updates */
2583                         port->pps_data.req_out_volt = port->supply_voltage;
2584                         port->pps_data.req_op_curr = port->current_limit;
2585                         port->pps_status = (type == PD_CTRL_WAIT ?
2586                                             -EAGAIN : -EOPNOTSUPP);
2587
2588                         if (port->data_role == TYPEC_HOST &&
2589                             port->send_discover)
2590                                 port->vdm_sm_running = true;
2591
2592                         tcpm_set_state(port, SNK_READY, 0);
2593                         break;
2594                 case DR_SWAP_SEND:
2595                         port->swap_status = (type == PD_CTRL_WAIT ?
2596                                              -EAGAIN : -EOPNOTSUPP);
2597                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
2598                         break;
2599                 case PR_SWAP_SEND:
2600                         port->swap_status = (type == PD_CTRL_WAIT ?
2601                                              -EAGAIN : -EOPNOTSUPP);
2602                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
2603                         break;
2604                 case VCONN_SWAP_SEND:
2605                         port->swap_status = (type == PD_CTRL_WAIT ?
2606                                              -EAGAIN : -EOPNOTSUPP);
2607                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
2608                         break;
2609                 case FR_SWAP_SEND:
2610                         tcpm_set_state(port, FR_SWAP_CANCEL, 0);
2611                         break;
2612                 case GET_SINK_CAP:
2613                         port->sink_cap_done = true;
2614                         tcpm_set_state(port, ready_state(port), 0);
2615                         break;
2616                 case SRC_READY:
2617                 case SNK_READY:
2618                         if (port->vdm_state > VDM_STATE_READY) {
2619                                 port->vdm_state = VDM_STATE_DONE;
2620                                 if (tcpm_vdm_ams(port))
2621                                         tcpm_ams_finish(port);
2622                                 mod_vdm_delayed_work(port, 0);
2623                                 break;
2624                         }
2625                         fallthrough;
2626                 default:
2627                         tcpm_pd_handle_state(port,
2628                                              port->pwr_role == TYPEC_SOURCE ?
2629                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2630                                              SNK_SOFT_RESET,
2631                                              NONE_AMS, 0);
2632                         break;
2633                 }
2634                 break;
2635         case PD_CTRL_ACCEPT:
2636                 switch (port->state) {
2637                 case SNK_NEGOTIATE_CAPABILITIES:
2638                         port->pps_data.active = false;
2639                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2640                         break;
2641                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
2642                         port->pps_data.active = true;
2643                         port->pps_data.min_volt = port->pps_data.req_min_volt;
2644                         port->pps_data.max_volt = port->pps_data.req_max_volt;
2645                         port->pps_data.max_curr = port->pps_data.req_max_curr;
2646                         port->req_supply_voltage = port->pps_data.req_out_volt;
2647                         port->req_current_limit = port->pps_data.req_op_curr;
2648                         power_supply_changed(port->psy);
2649                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
2650                         break;
2651                 case SOFT_RESET_SEND:
2652                         if (port->ams == SOFT_RESET_AMS)
2653                                 tcpm_ams_finish(port);
2654                         if (port->pwr_role == TYPEC_SOURCE) {
2655                                 port->upcoming_state = SRC_SEND_CAPABILITIES;
2656                                 tcpm_ams_start(port, POWER_NEGOTIATION);
2657                         } else {
2658                                 tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
2659                         }
2660                         break;
2661                 case DR_SWAP_SEND:
2662                         if (port->data_role == TYPEC_DEVICE &&
2663                             port->send_discover)
2664                                 port->vdm_sm_running = true;
2665
2666                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
2667                         break;
2668                 case PR_SWAP_SEND:
2669                         tcpm_set_state(port, PR_SWAP_START, 0);
2670                         break;
2671                 case VCONN_SWAP_SEND:
2672                         tcpm_set_state(port, VCONN_SWAP_START, 0);
2673                         break;
2674                 case FR_SWAP_SEND:
2675                         tcpm_set_state(port, FR_SWAP_SNK_SRC_TRANSITION_TO_OFF, 0);
2676                         break;
2677                 default:
2678                         tcpm_pd_handle_state(port,
2679                                              port->pwr_role == TYPEC_SOURCE ?
2680                                              SRC_SOFT_RESET_WAIT_SNK_TX :
2681                                              SNK_SOFT_RESET,
2682                                              NONE_AMS, 0);
2683                         break;
2684                 }
2685                 break;
2686         case PD_CTRL_SOFT_RESET:
2687                 port->ams = SOFT_RESET_AMS;
2688                 tcpm_set_state(port, SOFT_RESET, 0);
2689                 break;
2690         case PD_CTRL_DR_SWAP:
2691                 /*
2692                  * XXX
2693                  * 6.3.9: If an alternate mode is active, a request to swap
2694                  * alternate modes shall trigger a port reset.
2695                  */
2696                 if (port->typec_caps.data != TYPEC_PORT_DRD) {
2697                         tcpm_pd_handle_msg(port,
2698                                            port->negotiated_rev < PD_REV30 ?
2699                                            PD_MSG_CTRL_REJECT :
2700                                            PD_MSG_CTRL_NOT_SUPP,
2701                                            NONE_AMS);
2702                 } else {
2703                         if (port->vdm_sm_running) {
2704                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2705                                 break;
2706                         }
2707
2708                         tcpm_pd_handle_state(port, DR_SWAP_ACCEPT, DATA_ROLE_SWAP, 0);
2709                 }
2710                 break;
2711         case PD_CTRL_PR_SWAP:
2712                 if (port->port_type != TYPEC_PORT_DRP) {
2713                         tcpm_pd_handle_msg(port,
2714                                            port->negotiated_rev < PD_REV30 ?
2715                                            PD_MSG_CTRL_REJECT :
2716                                            PD_MSG_CTRL_NOT_SUPP,
2717                                            NONE_AMS);
2718                 } else {
2719                         if (port->vdm_sm_running) {
2720                                 tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2721                                 break;
2722                         }
2723
2724                         tcpm_pd_handle_state(port, PR_SWAP_ACCEPT, POWER_ROLE_SWAP, 0);
2725                 }
2726                 break;
2727         case PD_CTRL_VCONN_SWAP:
2728                 if (port->vdm_sm_running) {
2729                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
2730                         break;
2731                 }
2732
2733                 tcpm_pd_handle_state(port, VCONN_SWAP_ACCEPT, VCONN_SWAP, 0);
2734                 break;
2735         case PD_CTRL_GET_SOURCE_CAP_EXT:
2736         case PD_CTRL_GET_STATUS:
2737         case PD_CTRL_FR_SWAP:
2738         case PD_CTRL_GET_PPS_STATUS:
2739         case PD_CTRL_GET_COUNTRY_CODES:
2740                 /* Currently not supported */
2741                 tcpm_pd_handle_msg(port,
2742                                    port->negotiated_rev < PD_REV30 ?
2743                                    PD_MSG_CTRL_REJECT :
2744                                    PD_MSG_CTRL_NOT_SUPP,
2745                                    NONE_AMS);
2746                 break;
2747         default:
2748                 tcpm_pd_handle_msg(port,
2749                                    port->negotiated_rev < PD_REV30 ?
2750                                    PD_MSG_CTRL_REJECT :
2751                                    PD_MSG_CTRL_NOT_SUPP,
2752                                    NONE_AMS);
2753                 tcpm_log(port, "Unrecognized ctrl message type %#x", type);
2754                 break;
2755         }
2756 }
2757
2758 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
2759                                     const struct pd_message *msg)
2760 {
2761         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
2762         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
2763
2764         /* stopping VDM state machine if interrupted by other Messages */
2765         if (tcpm_vdm_ams(port)) {
2766                 port->vdm_state = VDM_STATE_ERR_BUSY;
2767                 tcpm_ams_finish(port);
2768                 mod_vdm_delayed_work(port, 0);
2769         }
2770
2771         if (!(le16_to_cpu(msg->ext_msg.header) & PD_EXT_HDR_CHUNKED)) {
2772                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2773                 tcpm_log(port, "Unchunked extended messages unsupported");
2774                 return;
2775         }
2776
2777         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
2778                 tcpm_pd_handle_state(port, CHUNK_NOT_SUPP, NONE_AMS, PD_T_CHUNK_NOT_SUPP);
2779                 tcpm_log(port, "Chunk handling not yet supported");
2780                 return;
2781         }
2782
2783         switch (type) {
2784         case PD_EXT_STATUS:
2785         case PD_EXT_PPS_STATUS:
2786                 if (port->ams == GETTING_SOURCE_SINK_STATUS) {
2787                         tcpm_ams_finish(port);
2788                         tcpm_set_state(port, ready_state(port), 0);
2789                 } else {
2790                         /* unexpected Status or PPS_Status Message */
2791                         tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
2792                                              SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
2793                                              NONE_AMS, 0);
2794                 }
2795                 break;
2796         case PD_EXT_SOURCE_CAP_EXT:
2797         case PD_EXT_GET_BATT_CAP:
2798         case PD_EXT_GET_BATT_STATUS:
2799         case PD_EXT_BATT_CAP:
2800         case PD_EXT_GET_MANUFACTURER_INFO:
2801         case PD_EXT_MANUFACTURER_INFO:
2802         case PD_EXT_SECURITY_REQUEST:
2803         case PD_EXT_SECURITY_RESPONSE:
2804         case PD_EXT_FW_UPDATE_REQUEST:
2805         case PD_EXT_FW_UPDATE_RESPONSE:
2806         case PD_EXT_COUNTRY_INFO:
2807         case PD_EXT_COUNTRY_CODES:
2808                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2809                 break;
2810         default:
2811                 tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
2812                 tcpm_log(port, "Unrecognized extended message type %#x", type);
2813                 break;
2814         }
2815 }
2816
2817 static void tcpm_pd_rx_handler(struct kthread_work *work)
2818 {
2819         struct pd_rx_event *event = container_of(work,
2820                                                  struct pd_rx_event, work);
2821         const struct pd_message *msg = &event->msg;
2822         unsigned int cnt = pd_header_cnt_le(msg->header);
2823         struct tcpm_port *port = event->port;
2824
2825         mutex_lock(&port->lock);
2826
2827         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
2828                  port->attached);
2829
2830         if (port->attached) {
2831                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
2832                 unsigned int msgid = pd_header_msgid_le(msg->header);
2833
2834                 /*
2835                  * USB PD standard, 6.6.1.2:
2836                  * "... if MessageID value in a received Message is the
2837                  * same as the stored value, the receiver shall return a
2838                  * GoodCRC Message with that MessageID value and drop
2839                  * the Message (this is a retry of an already received
2840                  * Message). Note: this shall not apply to the Soft_Reset
2841                  * Message which always has a MessageID value of zero."
2842                  */
2843                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
2844                         goto done;
2845                 port->rx_msgid = msgid;
2846
2847                 /*
2848                  * If both ends believe to be DFP/host, we have a data role
2849                  * mismatch.
2850                  */
2851                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
2852                     (port->data_role == TYPEC_HOST)) {
2853                         tcpm_log(port,
2854                                  "Data role mismatch, initiating error recovery");
2855                         tcpm_set_state(port, ERROR_RECOVERY, 0);
2856                 } else {
2857                         if (le16_to_cpu(msg->header) & PD_HEADER_EXT_HDR)
2858                                 tcpm_pd_ext_msg_request(port, msg);
2859                         else if (cnt)
2860                                 tcpm_pd_data_request(port, msg);
2861                         else
2862                                 tcpm_pd_ctrl_request(port, msg);
2863                 }
2864         }
2865
2866 done:
2867         mutex_unlock(&port->lock);
2868         kfree(event);
2869 }
2870
2871 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
2872 {
2873         struct pd_rx_event *event;
2874
2875         event = kzalloc(sizeof(*event), GFP_ATOMIC);
2876         if (!event)
2877                 return;
2878
2879         kthread_init_work(&event->work, tcpm_pd_rx_handler);
2880         event->port = port;
2881         memcpy(&event->msg, msg, sizeof(*msg));
2882         kthread_queue_work(port->wq, &event->work);
2883 }
2884 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
2885
2886 static int tcpm_pd_send_control(struct tcpm_port *port,
2887                                 enum pd_ctrl_msg_type type)
2888 {
2889         struct pd_message msg;
2890
2891         memset(&msg, 0, sizeof(msg));
2892         msg.header = PD_HEADER_LE(type, port->pwr_role,
2893                                   port->data_role,
2894                                   port->negotiated_rev,
2895                                   port->message_id, 0);
2896
2897         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2898 }
2899
2900 /*
2901  * Send queued message without affecting state.
2902  * Return true if state machine should go back to sleep,
2903  * false otherwise.
2904  */
2905 static bool tcpm_send_queued_message(struct tcpm_port *port)
2906 {
2907         enum pd_msg_request queued_message;
2908         int ret;
2909
2910         do {
2911                 queued_message = port->queued_message;
2912                 port->queued_message = PD_MSG_NONE;
2913
2914                 switch (queued_message) {
2915                 case PD_MSG_CTRL_WAIT:
2916                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
2917                         break;
2918                 case PD_MSG_CTRL_REJECT:
2919                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
2920                         break;
2921                 case PD_MSG_CTRL_NOT_SUPP:
2922                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2923                         break;
2924                 case PD_MSG_DATA_SINK_CAP:
2925                         ret = tcpm_pd_send_sink_caps(port);
2926                         if (ret < 0) {
2927                                 tcpm_log(port, "Unable to send snk caps, ret=%d", ret);
2928                                 tcpm_set_state(port, SNK_SOFT_RESET, 0);
2929                         }
2930                         tcpm_ams_finish(port);
2931                         break;
2932                 case PD_MSG_DATA_SOURCE_CAP:
2933                         ret = tcpm_pd_send_source_caps(port);
2934                         if (ret < 0) {
2935                                 tcpm_log(port,
2936                                          "Unable to send src caps, ret=%d",
2937                                          ret);
2938                                 tcpm_set_state(port, SOFT_RESET_SEND, 0);
2939                         } else if (port->pwr_role == TYPEC_SOURCE) {
2940                                 tcpm_ams_finish(port);
2941                                 tcpm_set_state(port, HARD_RESET_SEND,
2942                                                PD_T_SENDER_RESPONSE);
2943                         } else {
2944                                 tcpm_ams_finish(port);
2945                         }
2946                         break;
2947                 default:
2948                         break;
2949                 }
2950         } while (port->queued_message != PD_MSG_NONE);
2951
2952         if (port->delayed_state != INVALID_STATE) {
2953                 if (ktime_after(port->delayed_runtime, ktime_get())) {
2954                         mod_tcpm_delayed_work(port, ktime_to_ms(ktime_sub(port->delayed_runtime,
2955                                                                           ktime_get())));
2956                         return true;
2957                 }
2958                 port->delayed_state = INVALID_STATE;
2959         }
2960         return false;
2961 }
2962
2963 static int tcpm_pd_check_request(struct tcpm_port *port)
2964 {
2965         u32 pdo, rdo = port->sink_request;
2966         unsigned int max, op, pdo_max, index;
2967         enum pd_pdo_type type;
2968
2969         index = rdo_index(rdo);
2970         if (!index || index > port->nr_src_pdo)
2971                 return -EINVAL;
2972
2973         pdo = port->src_pdo[index - 1];
2974         type = pdo_type(pdo);
2975         switch (type) {
2976         case PDO_TYPE_FIXED:
2977         case PDO_TYPE_VAR:
2978                 max = rdo_max_current(rdo);
2979                 op = rdo_op_current(rdo);
2980                 pdo_max = pdo_max_current(pdo);
2981
2982                 if (op > pdo_max)
2983                         return -EINVAL;
2984                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2985                         return -EINVAL;
2986
2987                 if (type == PDO_TYPE_FIXED)
2988                         tcpm_log(port,
2989                                  "Requested %u mV, %u mA for %u / %u mA",
2990                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
2991                 else
2992                         tcpm_log(port,
2993                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
2994                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2995                                  pdo_max, op, max);
2996                 break;
2997         case PDO_TYPE_BATT:
2998                 max = rdo_max_power(rdo);
2999                 op = rdo_op_power(rdo);
3000                 pdo_max = pdo_max_power(pdo);
3001
3002                 if (op > pdo_max)
3003                         return -EINVAL;
3004                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
3005                         return -EINVAL;
3006                 tcpm_log(port,
3007                          "Requested %u -> %u mV, %u mW for %u / %u mW",
3008                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
3009                          pdo_max, op, max);
3010                 break;
3011         default:
3012                 return -EINVAL;
3013         }
3014
3015         port->op_vsafe5v = index == 1;
3016
3017         return 0;
3018 }
3019
3020 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
3021 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
3022
3023 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
3024                               int *src_pdo)
3025 {
3026         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
3027                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
3028                      min_snk_mv = 0;
3029         int ret = -EINVAL;
3030
3031         port->pps_data.supported = false;
3032         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
3033         power_supply_changed(port->psy);
3034
3035         /*
3036          * Select the source PDO providing the most power which has a
3037          * matchig sink cap.
3038          */
3039         for (i = 0; i < port->nr_source_caps; i++) {
3040                 u32 pdo = port->source_caps[i];
3041                 enum pd_pdo_type type = pdo_type(pdo);
3042
3043                 switch (type) {
3044                 case PDO_TYPE_FIXED:
3045                         max_src_mv = pdo_fixed_voltage(pdo);
3046                         min_src_mv = max_src_mv;
3047                         break;
3048                 case PDO_TYPE_BATT:
3049                 case PDO_TYPE_VAR:
3050                         max_src_mv = pdo_max_voltage(pdo);
3051                         min_src_mv = pdo_min_voltage(pdo);
3052                         break;
3053                 case PDO_TYPE_APDO:
3054                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
3055                                 port->pps_data.supported = true;
3056                                 port->usb_type =
3057                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
3058                                 power_supply_changed(port->psy);
3059                         }
3060                         continue;
3061                 default:
3062                         tcpm_log(port, "Invalid source PDO type, ignoring");
3063                         continue;
3064                 }
3065
3066                 switch (type) {
3067                 case PDO_TYPE_FIXED:
3068                 case PDO_TYPE_VAR:
3069                         src_ma = pdo_max_current(pdo);
3070                         src_mw = src_ma * min_src_mv / 1000;
3071                         break;
3072                 case PDO_TYPE_BATT:
3073                         src_mw = pdo_max_power(pdo);
3074                         break;
3075                 case PDO_TYPE_APDO:
3076                         continue;
3077                 default:
3078                         tcpm_log(port, "Invalid source PDO type, ignoring");
3079                         continue;
3080                 }
3081
3082                 for (j = 0; j < port->nr_snk_pdo; j++) {
3083                         pdo = port->snk_pdo[j];
3084
3085                         switch (pdo_type(pdo)) {
3086                         case PDO_TYPE_FIXED:
3087                                 max_snk_mv = pdo_fixed_voltage(pdo);
3088                                 min_snk_mv = max_snk_mv;
3089                                 break;
3090                         case PDO_TYPE_BATT:
3091                         case PDO_TYPE_VAR:
3092                                 max_snk_mv = pdo_max_voltage(pdo);
3093                                 min_snk_mv = pdo_min_voltage(pdo);
3094                                 break;
3095                         case PDO_TYPE_APDO:
3096                                 continue;
3097                         default:
3098                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
3099                                 continue;
3100                         }
3101
3102                         if (max_src_mv <= max_snk_mv &&
3103                                 min_src_mv >= min_snk_mv) {
3104                                 /* Prefer higher voltages if available */
3105                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
3106                                                         src_mw > max_mw) {
3107                                         *src_pdo = i;
3108                                         *sink_pdo = j;
3109                                         max_mw = src_mw;
3110                                         max_mv = min_src_mv;
3111                                         ret = 0;
3112                                 }
3113                         }
3114                 }
3115         }
3116
3117         return ret;
3118 }
3119
3120 #define min_pps_apdo_current(x, y)      \
3121         min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
3122
3123 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
3124 {
3125         unsigned int i, j, max_mw = 0, max_mv = 0;
3126         unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
3127         unsigned int min_snk_mv, max_snk_mv;
3128         unsigned int max_op_mv;
3129         u32 pdo, src, snk;
3130         unsigned int src_pdo = 0, snk_pdo = 0;
3131
3132         /*
3133          * Select the source PPS APDO providing the most power while staying
3134          * within the board's limits. We skip the first PDO as this is always
3135          * 5V 3A.
3136          */
3137         for (i = 1; i < port->nr_source_caps; ++i) {
3138                 pdo = port->source_caps[i];
3139
3140                 switch (pdo_type(pdo)) {
3141                 case PDO_TYPE_APDO:
3142                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3143                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
3144                                 continue;
3145                         }
3146
3147                         min_src_mv = pdo_pps_apdo_min_voltage(pdo);
3148                         max_src_mv = pdo_pps_apdo_max_voltage(pdo);
3149                         src_ma = pdo_pps_apdo_max_current(pdo);
3150                         src_mw = (src_ma * max_src_mv) / 1000;
3151
3152                         /*
3153                          * Now search through the sink PDOs to find a matching
3154                          * PPS APDO. Again skip the first sink PDO as this will
3155                          * always be 5V 3A.
3156                          */
3157                         for (j = 1; j < port->nr_snk_pdo; j++) {
3158                                 pdo = port->snk_pdo[j];
3159
3160                                 switch (pdo_type(pdo)) {
3161                                 case PDO_TYPE_APDO:
3162                                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3163                                                 tcpm_log(port,
3164                                                          "Not PPS APDO (sink), ignoring");
3165                                                 continue;
3166                                         }
3167
3168                                         min_snk_mv =
3169                                                 pdo_pps_apdo_min_voltage(pdo);
3170                                         max_snk_mv =
3171                                                 pdo_pps_apdo_max_voltage(pdo);
3172                                         break;
3173                                 default:
3174                                         tcpm_log(port,
3175                                                  "Not APDO type (sink), ignoring");
3176                                         continue;
3177                                 }
3178
3179                                 if (min_src_mv <= max_snk_mv &&
3180                                     max_src_mv >= min_snk_mv) {
3181                                         max_op_mv = min(max_src_mv, max_snk_mv);
3182                                         src_mw = (max_op_mv * src_ma) / 1000;
3183                                         /* Prefer higher voltages if available */
3184                                         if ((src_mw == max_mw &&
3185                                              max_op_mv > max_mv) ||
3186                                             src_mw > max_mw) {
3187                                                 src_pdo = i;
3188                                                 snk_pdo = j;
3189                                                 max_mw = src_mw;
3190                                                 max_mv = max_op_mv;
3191                                         }
3192                                 }
3193                         }
3194
3195                         break;
3196                 default:
3197                         tcpm_log(port, "Not APDO type (source), ignoring");
3198                         continue;
3199                 }
3200         }
3201
3202         if (src_pdo) {
3203                 src = port->source_caps[src_pdo];
3204                 snk = port->snk_pdo[snk_pdo];
3205
3206                 port->pps_data.req_min_volt = max(pdo_pps_apdo_min_voltage(src),
3207                                                   pdo_pps_apdo_min_voltage(snk));
3208                 port->pps_data.req_max_volt = min(pdo_pps_apdo_max_voltage(src),
3209                                                   pdo_pps_apdo_max_voltage(snk));
3210                 port->pps_data.req_max_curr = min_pps_apdo_current(src, snk);
3211                 port->pps_data.req_out_volt = min(port->pps_data.req_max_volt,
3212                                                   max(port->pps_data.req_min_volt,
3213                                                       port->pps_data.req_out_volt));
3214                 port->pps_data.req_op_curr = min(port->pps_data.req_max_curr,
3215                                                  port->pps_data.req_op_curr);
3216         }
3217
3218         return src_pdo;
3219 }
3220
3221 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
3222 {
3223         unsigned int mv, ma, mw, flags;
3224         unsigned int max_ma, max_mw;
3225         enum pd_pdo_type type;
3226         u32 pdo, matching_snk_pdo;
3227         int src_pdo_index = 0;
3228         int snk_pdo_index = 0;
3229         int ret;
3230
3231         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
3232         if (ret < 0)
3233                 return ret;
3234
3235         pdo = port->source_caps[src_pdo_index];
3236         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
3237         type = pdo_type(pdo);
3238
3239         switch (type) {
3240         case PDO_TYPE_FIXED:
3241                 mv = pdo_fixed_voltage(pdo);
3242                 break;
3243         case PDO_TYPE_BATT:
3244         case PDO_TYPE_VAR:
3245                 mv = pdo_min_voltage(pdo);
3246                 break;
3247         default:
3248                 tcpm_log(port, "Invalid PDO selected!");
3249                 return -EINVAL;
3250         }
3251
3252         /* Select maximum available current within the sink pdo's limit */
3253         if (type == PDO_TYPE_BATT) {
3254                 mw = min_power(pdo, matching_snk_pdo);
3255                 ma = 1000 * mw / mv;
3256         } else {
3257                 ma = min_current(pdo, matching_snk_pdo);
3258                 mw = ma * mv / 1000;
3259         }
3260
3261         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3262
3263         /* Set mismatch bit if offered power is less than operating power */
3264         max_ma = ma;
3265         max_mw = mw;
3266         if (mw < port->operating_snk_mw) {
3267                 flags |= RDO_CAP_MISMATCH;
3268                 if (type == PDO_TYPE_BATT &&
3269                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
3270                         max_mw = pdo_max_power(matching_snk_pdo);
3271                 else if (pdo_max_current(matching_snk_pdo) >
3272                          pdo_max_current(pdo))
3273                         max_ma = pdo_max_current(matching_snk_pdo);
3274         }
3275
3276         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3277                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3278                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3279                  port->polarity);
3280
3281         if (type == PDO_TYPE_BATT) {
3282                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
3283
3284                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
3285                          src_pdo_index, mv, mw,
3286                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3287         } else {
3288                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
3289
3290                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
3291                          src_pdo_index, mv, ma,
3292                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
3293         }
3294
3295         port->req_current_limit = ma;
3296         port->req_supply_voltage = mv;
3297
3298         return 0;
3299 }
3300
3301 static int tcpm_pd_send_request(struct tcpm_port *port)
3302 {
3303         struct pd_message msg;
3304         int ret;
3305         u32 rdo;
3306
3307         ret = tcpm_pd_build_request(port, &rdo);
3308         if (ret < 0)
3309                 return ret;
3310
3311         memset(&msg, 0, sizeof(msg));
3312         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3313                                   port->pwr_role,
3314                                   port->data_role,
3315                                   port->negotiated_rev,
3316                                   port->message_id, 1);
3317         msg.payload[0] = cpu_to_le32(rdo);
3318
3319         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3320 }
3321
3322 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
3323 {
3324         unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
3325         enum pd_pdo_type type;
3326         unsigned int src_pdo_index;
3327         u32 pdo;
3328
3329         src_pdo_index = tcpm_pd_select_pps_apdo(port);
3330         if (!src_pdo_index)
3331                 return -EOPNOTSUPP;
3332
3333         pdo = port->source_caps[src_pdo_index];
3334         type = pdo_type(pdo);
3335
3336         switch (type) {
3337         case PDO_TYPE_APDO:
3338                 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
3339                         tcpm_log(port, "Invalid APDO selected!");
3340                         return -EINVAL;
3341                 }
3342                 max_mv = port->pps_data.req_max_volt;
3343                 max_ma = port->pps_data.req_max_curr;
3344                 out_mv = port->pps_data.req_out_volt;
3345                 op_ma = port->pps_data.req_op_curr;
3346                 break;
3347         default:
3348                 tcpm_log(port, "Invalid PDO selected!");
3349                 return -EINVAL;
3350         }
3351
3352         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
3353
3354         op_mw = (op_ma * out_mv) / 1000;
3355         if (op_mw < port->operating_snk_mw) {
3356                 /*
3357                  * Try raising current to meet power needs. If that's not enough
3358                  * then try upping the voltage. If that's still not enough
3359                  * then we've obviously chosen a PPS APDO which really isn't
3360                  * suitable so abandon ship.
3361                  */
3362                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
3363                 if ((port->operating_snk_mw * 1000) % out_mv)
3364                         ++op_ma;
3365                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
3366
3367                 if (op_ma > max_ma) {
3368                         op_ma = max_ma;
3369                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
3370                         if ((port->operating_snk_mw * 1000) % op_ma)
3371                                 ++out_mv;
3372                         out_mv += RDO_PROG_VOLT_MV_STEP -
3373                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
3374
3375                         if (out_mv > max_mv) {
3376                                 tcpm_log(port, "Invalid PPS APDO selected!");
3377                                 return -EINVAL;
3378                         }
3379                 }
3380         }
3381
3382         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
3383                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
3384                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
3385                  port->polarity);
3386
3387         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
3388
3389         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
3390                  src_pdo_index, out_mv, op_ma);
3391
3392         port->pps_data.req_op_curr = op_ma;
3393         port->pps_data.req_out_volt = out_mv;
3394
3395         return 0;
3396 }
3397
3398 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
3399 {
3400         struct pd_message msg;
3401         int ret;
3402         u32 rdo;
3403
3404         ret = tcpm_pd_build_pps_request(port, &rdo);
3405         if (ret < 0)
3406                 return ret;
3407
3408         memset(&msg, 0, sizeof(msg));
3409         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
3410                                   port->pwr_role,
3411                                   port->data_role,
3412                                   port->negotiated_rev,
3413                                   port->message_id, 1);
3414         msg.payload[0] = cpu_to_le32(rdo);
3415
3416         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
3417 }
3418
3419 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
3420 {
3421         int ret;
3422
3423         if (enable && port->vbus_charge)
3424                 return -EINVAL;
3425
3426         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
3427
3428         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
3429         if (ret < 0)
3430                 return ret;
3431
3432         port->vbus_source = enable;
3433         return 0;
3434 }
3435
3436 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
3437 {
3438         int ret;
3439
3440         if (charge && port->vbus_source)
3441                 return -EINVAL;
3442
3443         if (charge != port->vbus_charge) {
3444                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
3445                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
3446                                            charge);
3447                 if (ret < 0)
3448                         return ret;
3449         }
3450         port->vbus_charge = charge;
3451         power_supply_changed(port->psy);
3452         return 0;
3453 }
3454
3455 static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
3456 {
3457         int ret;
3458
3459         if (!port->tcpc->start_toggling)
3460                 return false;
3461
3462         tcpm_log_force(port, "Start toggling");
3463         ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
3464         return ret == 0;
3465 }
3466
3467 static int tcpm_init_vbus(struct tcpm_port *port)
3468 {
3469         int ret;
3470
3471         ret = port->tcpc->set_vbus(port->tcpc, false, false);
3472         port->vbus_source = false;
3473         port->vbus_charge = false;
3474         return ret;
3475 }
3476
3477 static int tcpm_init_vconn(struct tcpm_port *port)
3478 {
3479         int ret;
3480
3481         ret = port->tcpc->set_vconn(port->tcpc, false);
3482         port->vconn_role = TYPEC_SINK;
3483         return ret;
3484 }
3485
3486 static void tcpm_typec_connect(struct tcpm_port *port)
3487 {
3488         if (!port->connected) {
3489                 /* Make sure we don't report stale identity information */
3490                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
3491                 port->partner_desc.usb_pd = port->pd_capable;
3492                 if (tcpm_port_is_debug(port))
3493                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
3494                 else if (tcpm_port_is_audio(port))
3495                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
3496                 else
3497                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
3498                 port->partner = typec_register_partner(port->typec_port,
3499                                                        &port->partner_desc);
3500                 port->connected = true;
3501         }
3502 }
3503
3504 static int tcpm_src_attach(struct tcpm_port *port)
3505 {
3506         enum typec_cc_polarity polarity =
3507                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
3508                                                          : TYPEC_POLARITY_CC1;
3509         int ret;
3510
3511         if (port->attached)
3512                 return 0;
3513
3514         ret = tcpm_set_polarity(port, polarity);
3515         if (ret < 0)
3516                 return ret;
3517
3518         if (port->tcpc->enable_auto_vbus_discharge) {
3519                 ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, true);
3520                 tcpm_log_force(port, "enable vbus discharge ret:%d", ret);
3521                 if (!ret)
3522                         port->auto_vbus_discharge_enabled = true;
3523         }
3524
3525         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
3526         if (ret < 0)
3527                 return ret;
3528
3529         ret = port->tcpc->set_pd_rx(port->tcpc, true);
3530         if (ret < 0)
3531                 goto out_disable_mux;
3532
3533         /*
3534          * USB Type-C specification, version 1.2,
3535          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
3536          * Enable VCONN only if the non-RD port is set to RA.
3537          */
3538         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
3539             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
3540                 ret = tcpm_set_vconn(port, true);
3541                 if (ret < 0)
3542                         goto out_disable_pd;
3543         }
3544
3545         ret = tcpm_set_vbus(port, true);
3546         if (ret < 0)
3547                 goto out_disable_vconn;
3548
3549         port->pd_capable = false;
3550
3551         port->partner = NULL;
3552
3553         port->attached = true;
3554         port->send_discover = true;
3555
3556         return 0;
3557
3558 out_disable_vconn:
3559         tcpm_set_vconn(port, false);
3560 out_disable_pd:
3561         port->tcpc->set_pd_rx(port->tcpc, false);
3562 out_disable_mux:
3563         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3564                      TYPEC_ORIENTATION_NONE);
3565         return ret;
3566 }
3567
3568 static void tcpm_typec_disconnect(struct tcpm_port *port)
3569 {
3570         if (port->connected) {
3571                 typec_unregister_partner(port->partner);
3572                 port->partner = NULL;
3573                 port->connected = false;
3574         }
3575 }
3576
3577 static void tcpm_unregister_altmodes(struct tcpm_port *port)
3578 {
3579         struct pd_mode_data *modep = &port->mode_data;
3580         int i;
3581
3582         for (i = 0; i < modep->altmodes; i++) {
3583                 typec_unregister_altmode(port->partner_altmode[i]);
3584                 port->partner_altmode[i] = NULL;
3585         }
3586
3587         memset(modep, 0, sizeof(*modep));
3588 }
3589
3590 static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
3591 {
3592         tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
3593
3594         if (port->tcpc->set_partner_usb_comm_capable)
3595                 port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
3596 }
3597
3598 static void tcpm_reset_port(struct tcpm_port *port)
3599 {
3600         int ret;
3601
3602         if (port->tcpc->enable_auto_vbus_discharge) {
3603                 ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, false);
3604                 tcpm_log_force(port, "Disable vbus discharge ret:%d", ret);
3605                 if (!ret)
3606                         port->auto_vbus_discharge_enabled = false;
3607         }
3608         port->in_ams = false;
3609         port->ams = NONE_AMS;
3610         port->vdm_sm_running = false;
3611         tcpm_unregister_altmodes(port);
3612         tcpm_typec_disconnect(port);
3613         port->attached = false;
3614         port->pd_capable = false;
3615         port->pps_data.supported = false;
3616         tcpm_set_partner_usb_comm_capable(port, false);
3617
3618         /*
3619          * First Rx ID should be 0; set this to a sentinel of -1 so that
3620          * we can check tcpm_pd_rx_handler() if we had seen it before.
3621          */
3622         port->rx_msgid = -1;
3623
3624         port->tcpc->set_pd_rx(port->tcpc, false);
3625         tcpm_init_vbus(port);   /* also disables charging */
3626         tcpm_init_vconn(port);
3627         tcpm_set_current_limit(port, 0, 0);
3628         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
3629         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
3630                      TYPEC_ORIENTATION_NONE);
3631         tcpm_set_attached_state(port, false);
3632         port->try_src_count = 0;
3633         port->try_snk_count = 0;
3634         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
3635         power_supply_changed(port->psy);
3636         port->nr_sink_caps = 0;
3637         port->sink_cap_done = false;
3638         if (port->tcpc->enable_frs)
3639                 port->tcpc->enable_frs(port->tcpc, false);
3640 }
3641
3642 static void tcpm_detach(struct tcpm_port *port)
3643 {
3644         if (tcpm_port_is_disconnected(port))
3645                 port->hard_reset_count = 0;
3646
3647         if (!port->attached)
3648                 return;
3649
3650         if (port->tcpc->set_bist_data) {
3651                 tcpm_log(port, "disable BIST MODE TESTDATA");
3652                 port->tcpc->set_bist_data(port->tcpc, false);
3653         }
3654
3655         tcpm_reset_port(port);
3656 }
3657
3658 static void tcpm_src_detach(struct tcpm_port *port)
3659 {
3660         tcpm_detach(port);
3661 }
3662
3663 static int tcpm_snk_attach(struct tcpm_port *port)
3664 {
3665         int ret;
3666
3667         if (port->attached)
3668                 return 0;
3669
3670         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
3671                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
3672         if (ret < 0)
3673                 return ret;
3674
3675         if (port->tcpc->enable_auto_vbus_discharge) {
3676                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
3677                 ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, true);
3678                 tcpm_log_force(port, "enable vbus discharge ret:%d", ret);
3679                 if (!ret)
3680                         port->auto_vbus_discharge_enabled = true;
3681         }
3682
3683         ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
3684         if (ret < 0)
3685                 return ret;
3686
3687         port->pd_capable = false;
3688
3689         port->partner = NULL;
3690
3691         port->attached = true;
3692         port->send_discover = true;
3693
3694         return 0;
3695 }
3696
3697 static void tcpm_snk_detach(struct tcpm_port *port)
3698 {
3699         tcpm_detach(port);
3700 }
3701
3702 static int tcpm_acc_attach(struct tcpm_port *port)
3703 {
3704         int ret;
3705
3706         if (port->attached)
3707                 return 0;
3708
3709         ret = tcpm_set_roles(port, true, TYPEC_SOURCE,
3710                              tcpm_data_role_for_source(port));
3711         if (ret < 0)
3712                 return ret;
3713
3714         port->partner = NULL;
3715
3716         tcpm_typec_connect(port);
3717
3718         port->attached = true;
3719
3720         return 0;
3721 }
3722
3723 static void tcpm_acc_detach(struct tcpm_port *port)
3724 {
3725         tcpm_detach(port);
3726 }
3727
3728 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
3729 {
3730         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
3731                 return HARD_RESET_SEND;
3732         if (port->pd_capable)
3733                 return ERROR_RECOVERY;
3734         if (port->pwr_role == TYPEC_SOURCE)
3735                 return SRC_UNATTACHED;
3736         if (port->state == SNK_WAIT_CAPABILITIES)
3737                 return SNK_READY;
3738         return SNK_UNATTACHED;
3739 }
3740
3741 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
3742 {
3743         if (port->port_type == TYPEC_PORT_DRP) {
3744                 if (port->pwr_role == TYPEC_SOURCE)
3745                         return SRC_UNATTACHED;
3746                 else
3747                         return SNK_UNATTACHED;
3748         } else if (port->port_type == TYPEC_PORT_SRC) {
3749                 return SRC_UNATTACHED;
3750         }
3751
3752         return SNK_UNATTACHED;
3753 }
3754
3755 static void tcpm_swap_complete(struct tcpm_port *port, int result)
3756 {
3757         if (port->swap_pending) {
3758                 port->swap_status = result;
3759                 port->swap_pending = false;
3760                 port->non_pd_role_swap = false;
3761                 complete(&port->swap_complete);
3762         }
3763 }
3764
3765 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
3766 {
3767         switch (cc) {
3768         case TYPEC_CC_RP_1_5:
3769                 return TYPEC_PWR_MODE_1_5A;
3770         case TYPEC_CC_RP_3_0:
3771                 return TYPEC_PWR_MODE_3_0A;
3772         case TYPEC_CC_RP_DEF:
3773         default:
3774                 return TYPEC_PWR_MODE_USB;
3775         }
3776 }
3777
3778 static void run_state_machine(struct tcpm_port *port)
3779 {
3780         int ret;
3781         enum typec_pwr_opmode opmode;
3782         unsigned int msecs;
3783         enum tcpm_state upcoming_state;
3784
3785         port->enter_state = port->state;
3786         switch (port->state) {
3787         case TOGGLING:
3788                 break;
3789         /* SRC states */
3790         case SRC_UNATTACHED:
3791                 if (!port->non_pd_role_swap)
3792                         tcpm_swap_complete(port, -ENOTCONN);
3793                 tcpm_src_detach(port);
3794                 if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
3795                         tcpm_set_state(port, TOGGLING, 0);
3796                         break;
3797                 }
3798                 tcpm_set_cc(port, tcpm_rp_cc(port));
3799                 if (port->port_type == TYPEC_PORT_DRP)
3800                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
3801                 break;
3802         case SRC_ATTACH_WAIT:
3803                 if (tcpm_port_is_debug(port))
3804                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
3805                                        PD_T_CC_DEBOUNCE);
3806                 else if (tcpm_port_is_audio(port))
3807                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
3808                                        PD_T_CC_DEBOUNCE);
3809                 else if (tcpm_port_is_source(port) && port->vbus_vsafe0v)
3810                         tcpm_set_state(port,
3811                                        tcpm_try_snk(port) ? SNK_TRY
3812                                                           : SRC_ATTACHED,
3813                                        PD_T_CC_DEBOUNCE);
3814                 break;
3815
3816         case SNK_TRY:
3817                 port->try_snk_count++;
3818                 /*
3819                  * Requirements:
3820                  * - Do not drive vconn or vbus
3821                  * - Terminate CC pins (both) to Rd
3822                  * Action:
3823                  * - Wait for tDRPTry (PD_T_DRP_TRY).
3824                  *   Until then, ignore any state changes.
3825                  */
3826                 tcpm_set_cc(port, TYPEC_CC_RD);
3827                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
3828                 break;
3829         case SNK_TRY_WAIT:
3830                 if (tcpm_port_is_sink(port)) {
3831                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
3832                 } else {
3833                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3834                         port->max_wait = 0;
3835                 }
3836                 break;
3837         case SNK_TRY_WAIT_DEBOUNCE:
3838                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
3839                                PD_T_TRY_CC_DEBOUNCE);
3840                 break;
3841         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
3842                 if (port->vbus_present && tcpm_port_is_sink(port))
3843                         tcpm_set_state(port, SNK_ATTACHED, 0);
3844                 else
3845                         port->max_wait = 0;
3846                 break;
3847         case SRC_TRYWAIT:
3848                 tcpm_set_cc(port, tcpm_rp_cc(port));
3849                 if (port->max_wait == 0) {
3850                         port->max_wait = jiffies +
3851                                          msecs_to_jiffies(PD_T_DRP_TRY);
3852                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3853                                        PD_T_DRP_TRY);
3854                 } else {
3855                         if (time_is_after_jiffies(port->max_wait))
3856                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
3857                                                jiffies_to_msecs(port->max_wait -
3858                                                                 jiffies));
3859                         else
3860                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3861                 }
3862                 break;
3863         case SRC_TRYWAIT_DEBOUNCE:
3864                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
3865                 break;
3866         case SRC_TRYWAIT_UNATTACHED:
3867                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3868                 break;
3869
3870         case SRC_ATTACHED:
3871                 ret = tcpm_src_attach(port);
3872                 tcpm_set_state(port, SRC_UNATTACHED,
3873                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
3874                 break;
3875         case SRC_STARTUP:
3876                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
3877                 typec_set_pwr_opmode(port->typec_port, opmode);
3878                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3879                 port->caps_count = 0;
3880                 port->negotiated_rev = PD_MAX_REV;
3881                 port->message_id = 0;
3882                 port->rx_msgid = -1;
3883                 port->explicit_contract = false;
3884                 /* SNK -> SRC POWER/FAST_ROLE_SWAP finished */
3885                 if (port->ams == POWER_ROLE_SWAP ||
3886                     port->ams == FAST_ROLE_SWAP)
3887                         tcpm_ams_finish(port);
3888                 port->upcoming_state = SRC_SEND_CAPABILITIES;
3889                 tcpm_ams_start(port, POWER_NEGOTIATION);
3890                 break;
3891         case SRC_SEND_CAPABILITIES:
3892                 port->caps_count++;
3893                 if (port->caps_count > PD_N_CAPS_COUNT) {
3894                         tcpm_set_state(port, SRC_READY, 0);
3895                         break;
3896                 }
3897                 ret = tcpm_pd_send_source_caps(port);
3898                 if (ret < 0) {
3899                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
3900                                        PD_T_SEND_SOURCE_CAP);
3901                 } else {
3902                         /*
3903                          * Per standard, we should clear the reset counter here.
3904                          * However, that can result in state machine hang-ups.
3905                          * Reset it only in READY state to improve stability.
3906                          */
3907                         /* port->hard_reset_count = 0; */
3908                         port->caps_count = 0;
3909                         port->pd_capable = true;
3910                         tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
3911                                             PD_T_SEND_SOURCE_CAP);
3912                 }
3913                 break;
3914         case SRC_SEND_CAPABILITIES_TIMEOUT:
3915                 /*
3916                  * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
3917                  *
3918                  * PD 2.0 sinks are supposed to accept src-capabilities with a
3919                  * 3.0 header and simply ignore any src PDOs which the sink does
3920                  * not understand such as PPS but some 2.0 sinks instead ignore
3921                  * the entire PD_DATA_SOURCE_CAP message, causing contract
3922                  * negotiation to fail.
3923                  *
3924                  * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
3925                  * sending src-capabilities with a lower PD revision to
3926                  * make these broken sinks work.
3927                  */
3928                 if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
3929                         tcpm_set_state(port, HARD_RESET_SEND, 0);
3930                 } else if (port->negotiated_rev > PD_REV20) {
3931                         port->negotiated_rev--;
3932                         port->hard_reset_count = 0;
3933                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3934                 } else {
3935                         tcpm_set_state(port, hard_reset_state(port), 0);
3936                 }
3937                 break;
3938         case SRC_NEGOTIATE_CAPABILITIES:
3939                 ret = tcpm_pd_check_request(port);
3940                 if (ret < 0) {
3941                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
3942                         if (!port->explicit_contract) {
3943                                 tcpm_set_state(port,
3944                                                SRC_WAIT_NEW_CAPABILITIES, 0);
3945                         } else {
3946                                 tcpm_set_state(port, SRC_READY, 0);
3947                         }
3948                 } else {
3949                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3950                         tcpm_set_partner_usb_comm_capable(port,
3951                                                           !!(port->sink_request & RDO_USB_COMM));
3952                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
3953                                        PD_T_SRC_TRANSITION);
3954                 }
3955                 break;
3956         case SRC_TRANSITION_SUPPLY:
3957                 /* XXX: regulator_set_voltage(vbus, ...) */
3958                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3959                 port->explicit_contract = true;
3960                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
3961                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
3962                 tcpm_set_state_cond(port, SRC_READY, 0);
3963                 break;
3964         case SRC_READY:
3965 #if 1
3966                 port->hard_reset_count = 0;
3967 #endif
3968                 port->try_src_count = 0;
3969
3970                 tcpm_swap_complete(port, 0);
3971                 tcpm_typec_connect(port);
3972
3973                 if (port->ams != NONE_AMS)
3974                         tcpm_ams_finish(port);
3975                 if (port->next_ams != NONE_AMS) {
3976                         port->ams = port->next_ams;
3977                         port->next_ams = NONE_AMS;
3978                 }
3979
3980                 /*
3981                  * If previous AMS is interrupted, switch to the upcoming
3982                  * state.
3983                  */
3984                 if (port->upcoming_state != INVALID_STATE) {
3985                         upcoming_state = port->upcoming_state;
3986                         port->upcoming_state = INVALID_STATE;
3987                         tcpm_set_state(port, upcoming_state, 0);
3988                         break;
3989                 }
3990
3991                 /*
3992                  * 6.4.4.3.1 Discover Identity
3993                  * "The Discover Identity Command Shall only be sent to SOP when there is an
3994                  * Explicit Contract."
3995                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
3996                  * port->explicit_contract to decide whether to send the command.
3997                  */
3998                 if (port->explicit_contract)
3999                         mod_send_discover_delayed_work(port, 0);
4000                 else
4001                         port->send_discover = false;
4002
4003                 /*
4004                  * 6.3.5
4005                  * Sending ping messages is not necessary if
4006                  * - the source operates at vSafe5V
4007                  * or
4008                  * - The system is not operating in PD mode
4009                  * or
4010                  * - Both partners are connected using a Type-C connector
4011                  *
4012                  * There is no actual need to send PD messages since the local
4013                  * port type-c and the spec does not clearly say whether PD is
4014                  * possible when type-c is connected to Type-A/B
4015                  */
4016                 break;
4017         case SRC_WAIT_NEW_CAPABILITIES:
4018                 /* Nothing to do... */
4019                 break;
4020
4021         /* SNK states */
4022         case SNK_UNATTACHED:
4023                 if (!port->non_pd_role_swap)
4024                         tcpm_swap_complete(port, -ENOTCONN);
4025                 tcpm_pps_complete(port, -ENOTCONN);
4026                 tcpm_snk_detach(port);
4027                 if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
4028                         tcpm_set_state(port, TOGGLING, 0);
4029                         break;
4030                 }
4031                 tcpm_set_cc(port, TYPEC_CC_RD);
4032                 if (port->port_type == TYPEC_PORT_DRP)
4033                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
4034                 break;
4035         case SNK_ATTACH_WAIT:
4036                 if ((port->cc1 == TYPEC_CC_OPEN &&
4037                      port->cc2 != TYPEC_CC_OPEN) ||
4038                     (port->cc1 != TYPEC_CC_OPEN &&
4039                      port->cc2 == TYPEC_CC_OPEN))
4040                         tcpm_set_state(port, SNK_DEBOUNCED,
4041                                        PD_T_CC_DEBOUNCE);
4042                 else if (tcpm_port_is_disconnected(port))
4043                         tcpm_set_state(port, SNK_UNATTACHED,
4044                                        PD_T_PD_DEBOUNCE);
4045                 break;
4046         case SNK_DEBOUNCED:
4047                 if (tcpm_port_is_disconnected(port))
4048                         tcpm_set_state(port, SNK_UNATTACHED,
4049                                        PD_T_PD_DEBOUNCE);
4050                 else if (port->vbus_present)
4051                         tcpm_set_state(port,
4052                                        tcpm_try_src(port) ? SRC_TRY
4053                                                           : SNK_ATTACHED,
4054                                        0);
4055                 else
4056                         /* Wait for VBUS, but not forever */
4057                         tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
4058                 break;
4059
4060         case SRC_TRY:
4061                 port->try_src_count++;
4062                 tcpm_set_cc(port, tcpm_rp_cc(port));
4063                 port->max_wait = 0;
4064                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4065                 break;
4066         case SRC_TRY_WAIT:
4067                 if (port->max_wait == 0) {
4068                         port->max_wait = jiffies +
4069                                          msecs_to_jiffies(PD_T_DRP_TRY);
4070                         msecs = PD_T_DRP_TRY;
4071                 } else {
4072                         if (time_is_after_jiffies(port->max_wait))
4073                                 msecs = jiffies_to_msecs(port->max_wait -
4074                                                          jiffies);
4075                         else
4076                                 msecs = 0;
4077                 }
4078                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
4079                 break;
4080         case SRC_TRY_DEBOUNCE:
4081                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
4082                 break;
4083         case SNK_TRYWAIT:
4084                 tcpm_set_cc(port, TYPEC_CC_RD);
4085                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
4086                 break;
4087         case SNK_TRYWAIT_VBUS:
4088                 /*
4089                  * TCPM stays in this state indefinitely until VBUS
4090                  * is detected as long as Rp is not detected for
4091                  * more than a time period of tPDDebounce.
4092                  */
4093                 if (port->vbus_present && tcpm_port_is_sink(port)) {
4094                         tcpm_set_state(port, SNK_ATTACHED, 0);
4095                         break;
4096                 }
4097                 if (!tcpm_port_is_sink(port))
4098                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4099                 break;
4100         case SNK_TRYWAIT_DEBOUNCE:
4101                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
4102                 break;
4103         case SNK_ATTACHED:
4104                 ret = tcpm_snk_attach(port);
4105                 if (ret < 0)
4106                         tcpm_set_state(port, SNK_UNATTACHED, 0);
4107                 else
4108                         tcpm_set_state(port, SNK_STARTUP, 0);
4109                 break;
4110         case SNK_STARTUP:
4111                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
4112                                               port->cc2 : port->cc1);
4113                 typec_set_pwr_opmode(port->typec_port, opmode);
4114                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
4115                 port->negotiated_rev = PD_MAX_REV;
4116                 port->message_id = 0;
4117                 port->rx_msgid = -1;
4118                 port->explicit_contract = false;
4119
4120                 if (port->ams == POWER_ROLE_SWAP ||
4121                     port->ams == FAST_ROLE_SWAP)
4122                         /* SRC -> SNK POWER/FAST_ROLE_SWAP finished */
4123                         tcpm_ams_finish(port);
4124
4125                 tcpm_set_state(port, SNK_DISCOVERY, 0);
4126                 break;
4127         case SNK_DISCOVERY:
4128                 if (port->vbus_present) {
4129                         u32 current_lim = tcpm_get_current_limit(port);
4130
4131                         if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
4132                                 current_lim = PD_P_SNK_STDBY_MW / 5;
4133                         tcpm_set_current_limit(port, current_lim, 5000);
4134                         tcpm_set_charge(port, true);
4135                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4136                         break;
4137                 }
4138                 /*
4139                  * For DRP, timeouts differ. Also, handling is supposed to be
4140                  * different and much more complex (dead battery detection;
4141                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
4142                  */
4143                 tcpm_set_state(port, hard_reset_state(port),
4144                                port->port_type == TYPEC_PORT_DRP ?
4145                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
4146                 break;
4147         case SNK_DISCOVERY_DEBOUNCE:
4148                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
4149                                PD_T_CC_DEBOUNCE);
4150                 break;
4151         case SNK_DISCOVERY_DEBOUNCE_DONE:
4152                 if (!tcpm_port_is_disconnected(port) &&
4153                     tcpm_port_is_sink(port) &&
4154                     ktime_after(port->delayed_runtime, ktime_get())) {
4155                         tcpm_set_state(port, SNK_DISCOVERY,
4156                                        ktime_to_ms(ktime_sub(port->delayed_runtime, ktime_get())));
4157                         break;
4158                 }
4159                 tcpm_set_state(port, unattached_state(port), 0);
4160                 break;
4161         case SNK_WAIT_CAPABILITIES:
4162                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
4163                 if (ret < 0) {
4164                         tcpm_set_state(port, SNK_READY, 0);
4165                         break;
4166                 }
4167                 /*
4168                  * If VBUS has never been low, and we time out waiting
4169                  * for source cap, try a soft reset first, in case we
4170                  * were already in a stable contract before this boot.
4171                  * Do this only once.
4172                  */
4173                 if (port->vbus_never_low) {
4174                         port->vbus_never_low = false;
4175                         tcpm_set_state(port, SNK_SOFT_RESET,
4176                                        PD_T_SINK_WAIT_CAP);
4177                 } else {
4178                         tcpm_set_state(port, hard_reset_state(port),
4179                                        PD_T_SINK_WAIT_CAP);
4180                 }
4181                 break;
4182         case SNK_NEGOTIATE_CAPABILITIES:
4183                 port->pd_capable = true;
4184                 tcpm_set_partner_usb_comm_capable(port,
4185                                                   !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
4186                 port->hard_reset_count = 0;
4187                 ret = tcpm_pd_send_request(port);
4188                 if (ret < 0) {
4189                         /* Let the Source send capabilities again. */
4190                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4191                 } else {
4192                         tcpm_set_state_cond(port, hard_reset_state(port),
4193                                             PD_T_SENDER_RESPONSE);
4194                 }
4195                 break;
4196         case SNK_NEGOTIATE_PPS_CAPABILITIES:
4197                 ret = tcpm_pd_send_pps_request(port);
4198                 if (ret < 0) {
4199                         port->pps_status = ret;
4200                         /*
4201                          * If this was called due to updates to sink
4202                          * capabilities, and pps is no longer valid, we should
4203                          * safely fall back to a standard PDO.
4204                          */
4205                         if (port->update_sink_caps)
4206                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4207                         else
4208                                 tcpm_set_state(port, SNK_READY, 0);
4209                 } else {
4210                         tcpm_set_state_cond(port, hard_reset_state(port),
4211                                             PD_T_SENDER_RESPONSE);
4212                 }
4213                 break;
4214         case SNK_TRANSITION_SINK:
4215                 /* From the USB PD spec:
4216                  * "The Sink Shall transition to Sink Standby before a positive or
4217                  * negative voltage transition of VBUS. During Sink Standby
4218                  * the Sink Shall reduce its power draw to pSnkStdby."
4219                  *
4220                  * This is not applicable to PPS though as the port can continue
4221                  * to draw negotiated power without switching to standby.
4222                  */
4223                 if (port->supply_voltage != port->req_supply_voltage && !port->pps_data.active &&
4224                     port->current_limit * port->supply_voltage / 1000 > PD_P_SNK_STDBY_MW) {
4225                         u32 stdby_ma = PD_P_SNK_STDBY_MW * 1000 / port->supply_voltage;
4226
4227                         tcpm_log(port, "Setting standby current %u mV @ %u mA",
4228                                  port->supply_voltage, stdby_ma);
4229                         tcpm_set_current_limit(port, stdby_ma, port->supply_voltage);
4230                 }
4231                 fallthrough;
4232         case SNK_TRANSITION_SINK_VBUS:
4233                 tcpm_set_state(port, hard_reset_state(port),
4234                                PD_T_PS_TRANSITION);
4235                 break;
4236         case SNK_READY:
4237                 port->try_snk_count = 0;
4238                 port->update_sink_caps = false;
4239                 if (port->explicit_contract) {
4240                         typec_set_pwr_opmode(port->typec_port,
4241                                              TYPEC_PWR_MODE_PD);
4242                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
4243                 }
4244
4245                 if (!port->pd_capable && port->slow_charger_loop)
4246                         tcpm_set_current_limit(port, tcpm_get_current_limit(port), 5000);
4247                 tcpm_swap_complete(port, 0);
4248                 tcpm_typec_connect(port);
4249                 mod_enable_frs_delayed_work(port, 0);
4250                 tcpm_pps_complete(port, port->pps_status);
4251
4252                 if (port->ams != NONE_AMS)
4253                         tcpm_ams_finish(port);
4254                 if (port->next_ams != NONE_AMS) {
4255                         port->ams = port->next_ams;
4256                         port->next_ams = NONE_AMS;
4257                 }
4258
4259                 /*
4260                  * If previous AMS is interrupted, switch to the upcoming
4261                  * state.
4262                  */
4263                 if (port->upcoming_state != INVALID_STATE) {
4264                         upcoming_state = port->upcoming_state;
4265                         port->upcoming_state = INVALID_STATE;
4266                         tcpm_set_state(port, upcoming_state, 0);
4267                         break;
4268                 }
4269
4270                 /*
4271                  * 6.4.4.3.1 Discover Identity
4272                  * "The Discover Identity Command Shall only be sent to SOP when there is an
4273                  * Explicit Contract."
4274                  * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using
4275                  * port->explicit_contract.
4276                  */
4277                 if (port->explicit_contract)
4278                         mod_send_discover_delayed_work(port, 0);
4279                 else
4280                         port->send_discover = false;
4281
4282                 power_supply_changed(port->psy);
4283                 break;
4284
4285         /* Accessory states */
4286         case ACC_UNATTACHED:
4287                 tcpm_acc_detach(port);
4288                 tcpm_set_state(port, SRC_UNATTACHED, 0);
4289                 break;
4290         case DEBUG_ACC_ATTACHED:
4291         case AUDIO_ACC_ATTACHED:
4292                 ret = tcpm_acc_attach(port);
4293                 if (ret < 0)
4294                         tcpm_set_state(port, ACC_UNATTACHED, 0);
4295                 break;
4296         case AUDIO_ACC_DEBOUNCE:
4297                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
4298                 break;
4299
4300         /* Hard_Reset states */
4301         case HARD_RESET_SEND:
4302                 if (port->ams != NONE_AMS)
4303                         tcpm_ams_finish(port);
4304                 /*
4305                  * State machine will be directed to HARD_RESET_START,
4306                  * thus set upcoming_state to INVALID_STATE.
4307                  */
4308                 port->upcoming_state = INVALID_STATE;
4309                 tcpm_ams_start(port, HARD_RESET);
4310                 break;
4311         case HARD_RESET_START:
4312                 port->sink_cap_done = false;
4313                 if (port->tcpc->enable_frs)
4314                         port->tcpc->enable_frs(port->tcpc, false);
4315                 port->hard_reset_count++;
4316                 port->tcpc->set_pd_rx(port->tcpc, false);
4317                 tcpm_unregister_altmodes(port);
4318                 port->nr_sink_caps = 0;
4319                 port->send_discover = true;
4320                 if (port->pwr_role == TYPEC_SOURCE)
4321                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
4322                                        PD_T_PS_HARD_RESET);
4323                 else
4324                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
4325                 break;
4326         case SRC_HARD_RESET_VBUS_OFF:
4327                 /*
4328                  * 7.1.5 Response to Hard Resets
4329                  * Hard Reset Signaling indicates a communication failure has occurred and the
4330                  * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall
4331                  * drive VBUS to vSafe0V as shown in Figure 7-9.
4332                  */
4333                 tcpm_set_vconn(port, false);
4334                 tcpm_set_vbus(port, false);
4335                 tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
4336                                tcpm_data_role_for_source(port));
4337                 /*
4338                  * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V +
4339                  * PD_T_SRC_RECOVER before turning vbus back on.
4340                  * From Table 7-12 Sequence Description for a Source Initiated Hard Reset:
4341                  * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then
4342                  * tells the Device Policy Manager to instruct the power supply to perform a
4343                  * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2).
4344                  * 5. After tSrcRecover the Source applies power to VBUS in an attempt to
4345                  * re-establish communication with the Sink and resume USB Default Operation.
4346                  * The transition to vSafe5V Shall occur within tSrcTurnOn(t4).
4347                  */
4348                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER);
4349                 break;
4350         case SRC_HARD_RESET_VBUS_ON:
4351                 tcpm_set_vconn(port, true);
4352                 tcpm_set_vbus(port, true);
4353                 if (port->ams == HARD_RESET)
4354                         tcpm_ams_finish(port);
4355                 port->tcpc->set_pd_rx(port->tcpc, true);
4356                 tcpm_set_attached_state(port, true);
4357                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
4358                 break;
4359         case SNK_HARD_RESET_SINK_OFF:
4360                 /* Do not discharge/disconnect during hard reseet */
4361                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
4362                 memset(&port->pps_data, 0, sizeof(port->pps_data));
4363                 tcpm_set_vconn(port, false);
4364                 if (port->pd_capable)
4365                         tcpm_set_charge(port, false);
4366                 tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
4367                                tcpm_data_role_for_sink(port));
4368                 /*
4369                  * VBUS may or may not toggle, depending on the adapter.
4370                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
4371                  * directly after timeout.
4372                  */
4373                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
4374                 break;
4375         case SNK_HARD_RESET_WAIT_VBUS:
4376                 if (port->ams == HARD_RESET)
4377                         tcpm_ams_finish(port);
4378                 /* Assume we're disconnected if VBUS doesn't come back. */
4379                 tcpm_set_state(port, SNK_UNATTACHED,
4380                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
4381                 break;
4382         case SNK_HARD_RESET_SINK_ON:
4383                 /* Note: There is no guarantee that VBUS is on in this state */
4384                 /*
4385                  * XXX:
4386                  * The specification suggests that dual mode ports in sink
4387                  * mode should transition to state PE_SRC_Transition_to_default.
4388                  * See USB power delivery specification chapter 8.3.3.6.1.3.
4389                  * This would mean to to
4390                  * - turn off VCONN, reset power supply
4391                  * - request hardware reset
4392                  * - turn on VCONN
4393                  * - Transition to state PE_Src_Startup
4394                  * SNK only ports shall transition to state Snk_Startup
4395                  * (see chapter 8.3.3.3.8).
4396                  * Similar, dual-mode ports in source mode should transition
4397                  * to PE_SNK_Transition_to_default.
4398                  */
4399                 if (port->pd_capable) {
4400                         tcpm_set_current_limit(port,
4401                                                tcpm_get_current_limit(port),
4402                                                5000);
4403                         tcpm_set_charge(port, true);
4404                 }
4405                 if (port->ams == HARD_RESET)
4406                         tcpm_ams_finish(port);
4407                 tcpm_set_attached_state(port, true);
4408                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4409                 tcpm_set_state(port, SNK_STARTUP, 0);
4410                 break;
4411
4412         /* Soft_Reset states */
4413         case SOFT_RESET:
4414                 port->message_id = 0;
4415                 port->rx_msgid = -1;
4416                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4417                 tcpm_ams_finish(port);
4418                 if (port->pwr_role == TYPEC_SOURCE) {
4419                         port->upcoming_state = SRC_SEND_CAPABILITIES;
4420                         tcpm_ams_start(port, POWER_NEGOTIATION);
4421                 } else {
4422                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
4423                 }
4424                 break;
4425         case SRC_SOFT_RESET_WAIT_SNK_TX:
4426         case SNK_SOFT_RESET:
4427                 if (port->ams != NONE_AMS)
4428                         tcpm_ams_finish(port);
4429                 port->upcoming_state = SOFT_RESET_SEND;
4430                 tcpm_ams_start(port, SOFT_RESET_AMS);
4431                 break;
4432         case SOFT_RESET_SEND:
4433                 port->message_id = 0;
4434                 port->rx_msgid = -1;
4435                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
4436                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
4437                 else
4438                         tcpm_set_state_cond(port, hard_reset_state(port),
4439                                             PD_T_SENDER_RESPONSE);
4440                 break;
4441
4442         /* DR_Swap states */
4443         case DR_SWAP_SEND:
4444                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
4445                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
4446                                     PD_T_SENDER_RESPONSE);
4447                 break;
4448         case DR_SWAP_ACCEPT:
4449                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4450                 /* Set VDM state machine running flag ASAP */
4451                 if (port->data_role == TYPEC_DEVICE && port->send_discover)
4452                         port->vdm_sm_running = true;
4453                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
4454                 break;
4455         case DR_SWAP_SEND_TIMEOUT:
4456                 tcpm_swap_complete(port, -ETIMEDOUT);
4457                 tcpm_ams_finish(port);
4458                 tcpm_set_state(port, ready_state(port), 0);
4459                 break;
4460         case DR_SWAP_CHANGE_DR:
4461                 if (port->data_role == TYPEC_HOST) {
4462                         tcpm_unregister_altmodes(port);
4463                         tcpm_set_roles(port, true, port->pwr_role,
4464                                        TYPEC_DEVICE);
4465                 } else {
4466                         tcpm_set_roles(port, true, port->pwr_role,
4467                                        TYPEC_HOST);
4468                         port->send_discover = true;
4469                 }
4470                 tcpm_ams_finish(port);
4471                 tcpm_set_state(port, ready_state(port), 0);
4472                 break;
4473
4474         case FR_SWAP_SEND:
4475                 if (tcpm_pd_send_control(port, PD_CTRL_FR_SWAP)) {
4476                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4477                         break;
4478                 }
4479                 tcpm_set_state_cond(port, FR_SWAP_SEND_TIMEOUT, PD_T_SENDER_RESPONSE);
4480                 break;
4481         case FR_SWAP_SEND_TIMEOUT:
4482                 tcpm_set_state(port, ERROR_RECOVERY, 0);
4483                 break;
4484         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4485                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_OFF);
4486                 break;
4487         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4488                 if (port->vbus_source)
4489                         tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
4490                 else
4491                         tcpm_set_state(port, ERROR_RECOVERY, PD_T_RECEIVER_RESPONSE);
4492                 break;
4493         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4494                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4495                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4496                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4497                         break;
4498                 }
4499                 tcpm_set_cc(port, tcpm_rp_cc(port));
4500                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4501                 break;
4502
4503         /* PR_Swap states */
4504         case PR_SWAP_ACCEPT:
4505                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4506                 tcpm_set_state(port, PR_SWAP_START, 0);
4507                 break;
4508         case PR_SWAP_SEND:
4509                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
4510                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
4511                                     PD_T_SENDER_RESPONSE);
4512                 break;
4513         case PR_SWAP_SEND_TIMEOUT:
4514                 tcpm_swap_complete(port, -ETIMEDOUT);
4515                 tcpm_set_state(port, ready_state(port), 0);
4516                 break;
4517         case PR_SWAP_START:
4518                 if (port->pwr_role == TYPEC_SOURCE)
4519                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
4520                                        PD_T_SRC_TRANSITION);
4521                 else
4522                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
4523                 break;
4524         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4525                 /*
4526                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4527                  * as this is not a disconnect.
4528                  */
4529                 tcpm_set_vbus(port, false);
4530                 port->explicit_contract = false;
4531                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
4532                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
4533                                PD_T_SRCSWAPSTDBY);
4534                 break;
4535         case PR_SWAP_SRC_SNK_SOURCE_OFF:
4536                 tcpm_set_cc(port, TYPEC_CC_RD);
4537                 /* allow CC debounce */
4538                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
4539                                PD_T_CC_DEBOUNCE);
4540                 break;
4541         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4542                 /*
4543                  * USB-PD standard, 6.2.1.4, Port Power Role:
4544                  * "During the Power Role Swap Sequence, for the initial Source
4545                  * Port, the Port Power Role field shall be set to Sink in the
4546                  * PS_RDY Message indicating that the initial Source’s power
4547                  * supply is turned off"
4548                  */
4549                 tcpm_set_pwr_role(port, TYPEC_SINK);
4550                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
4551                         tcpm_set_state(port, ERROR_RECOVERY, 0);
4552                         break;
4553                 }
4554                 tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
4555                 break;
4556         case PR_SWAP_SRC_SNK_SINK_ON:
4557                 /* Set the vbus disconnect threshold for implicit contract */
4558                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
4559                 tcpm_set_state(port, SNK_STARTUP, 0);
4560                 break;
4561         case PR_SWAP_SNK_SRC_SINK_OFF:
4562                 /*
4563                  * Prevent vbus discharge circuit from turning on during PR_SWAP
4564                  * as this is not a disconnect.
4565                  */
4566                 tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB,
4567                                                        port->pps_data.active, 0);
4568                 tcpm_set_charge(port, false);
4569                 tcpm_set_state(port, hard_reset_state(port),
4570                                PD_T_PS_SOURCE_OFF);
4571                 break;
4572         case PR_SWAP_SNK_SRC_SOURCE_ON:
4573                 tcpm_set_cc(port, tcpm_rp_cc(port));
4574                 tcpm_set_vbus(port, true);
4575                 /*
4576                  * allow time VBUS ramp-up, must be < tNewSrc
4577                  * Also, this window overlaps with CC debounce as well.
4578                  * So, Wait for the max of two which is PD_T_NEWSRC
4579                  */
4580                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
4581                                PD_T_NEWSRC);
4582                 break;
4583         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
4584                 /*
4585                  * USB PD standard, 6.2.1.4:
4586                  * "Subsequent Messages initiated by the Policy Engine,
4587                  * such as the PS_RDY Message sent to indicate that Vbus
4588                  * is ready, will have the Port Power Role field set to
4589                  * Source."
4590                  */
4591                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
4592                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4593                 tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START);
4594                 break;
4595
4596         case VCONN_SWAP_ACCEPT:
4597                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
4598                 tcpm_ams_finish(port);
4599                 tcpm_set_state(port, VCONN_SWAP_START, 0);
4600                 break;
4601         case VCONN_SWAP_SEND:
4602                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
4603                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
4604                                PD_T_SENDER_RESPONSE);
4605                 break;
4606         case VCONN_SWAP_SEND_TIMEOUT:
4607                 tcpm_swap_complete(port, -ETIMEDOUT);
4608                 if (port->data_role == TYPEC_HOST && port->send_discover)
4609                         port->vdm_sm_running = true;
4610                 tcpm_set_state(port, ready_state(port), 0);
4611                 break;
4612         case VCONN_SWAP_START:
4613                 if (port->vconn_role == TYPEC_SOURCE)
4614                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
4615                 else
4616                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
4617                 break;
4618         case VCONN_SWAP_WAIT_FOR_VCONN:
4619                 tcpm_set_state(port, hard_reset_state(port),
4620                                PD_T_VCONN_SOURCE_ON);
4621                 break;
4622         case VCONN_SWAP_TURN_ON_VCONN:
4623                 tcpm_set_vconn(port, true);
4624                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
4625                 if (port->data_role == TYPEC_HOST && port->send_discover)
4626                         port->vdm_sm_running = true;
4627                 tcpm_set_state(port, ready_state(port), 0);
4628                 break;
4629         case VCONN_SWAP_TURN_OFF_VCONN:
4630                 tcpm_set_vconn(port, false);
4631                 if (port->data_role == TYPEC_HOST && port->send_discover)
4632                         port->vdm_sm_running = true;
4633                 tcpm_set_state(port, ready_state(port), 0);
4634                 break;
4635
4636         case DR_SWAP_CANCEL:
4637         case PR_SWAP_CANCEL:
4638         case VCONN_SWAP_CANCEL:
4639                 tcpm_swap_complete(port, port->swap_status);
4640                 if (port->data_role == TYPEC_HOST && port->send_discover)
4641                         port->vdm_sm_running = true;
4642                 if (port->pwr_role == TYPEC_SOURCE)
4643                         tcpm_set_state(port, SRC_READY, 0);
4644                 else
4645                         tcpm_set_state(port, SNK_READY, 0);
4646                 break;
4647         case FR_SWAP_CANCEL:
4648                 if (port->pwr_role == TYPEC_SOURCE)
4649                         tcpm_set_state(port, SRC_READY, 0);
4650                 else
4651                         tcpm_set_state(port, SNK_READY, 0);
4652                 break;
4653
4654         case BIST_RX:
4655                 switch (BDO_MODE_MASK(port->bist_request)) {
4656                 case BDO_MODE_CARRIER2:
4657                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
4658                         tcpm_set_state(port, unattached_state(port),
4659                                        PD_T_BIST_CONT_MODE);
4660                         break;
4661                 case BDO_MODE_TESTDATA:
4662                         if (port->tcpc->set_bist_data) {
4663                                 tcpm_log(port, "Enable BIST MODE TESTDATA");
4664                                 port->tcpc->set_bist_data(port->tcpc, true);
4665                         }
4666                         break;
4667                 default:
4668                         break;
4669                 }
4670                 break;
4671         case GET_STATUS_SEND:
4672                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
4673                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
4674                                PD_T_SENDER_RESPONSE);
4675                 break;
4676         case GET_STATUS_SEND_TIMEOUT:
4677                 tcpm_set_state(port, ready_state(port), 0);
4678                 break;
4679         case GET_PPS_STATUS_SEND:
4680                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
4681                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
4682                                PD_T_SENDER_RESPONSE);
4683                 break;
4684         case GET_PPS_STATUS_SEND_TIMEOUT:
4685                 tcpm_set_state(port, ready_state(port), 0);
4686                 break;
4687         case GET_SINK_CAP:
4688                 tcpm_pd_send_control(port, PD_CTRL_GET_SINK_CAP);
4689                 tcpm_set_state(port, GET_SINK_CAP_TIMEOUT, PD_T_SENDER_RESPONSE);
4690                 break;
4691         case GET_SINK_CAP_TIMEOUT:
4692                 port->sink_cap_done = true;
4693                 tcpm_set_state(port, ready_state(port), 0);
4694                 break;
4695         case ERROR_RECOVERY:
4696                 tcpm_swap_complete(port, -EPROTO);
4697                 tcpm_pps_complete(port, -EPROTO);
4698                 tcpm_set_state(port, PORT_RESET, 0);
4699                 break;
4700         case PORT_RESET:
4701                 tcpm_reset_port(port);
4702                 tcpm_set_cc(port, TYPEC_CC_OPEN);
4703                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
4704                                PD_T_ERROR_RECOVERY);
4705                 break;
4706         case PORT_RESET_WAIT_OFF:
4707                 tcpm_set_state(port,
4708                                tcpm_default_state(port),
4709                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
4710                 break;
4711
4712         /* AMS intermediate state */
4713         case AMS_START:
4714                 if (port->upcoming_state == INVALID_STATE) {
4715                         tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ?
4716                                        SRC_READY : SNK_READY, 0);
4717                         break;
4718                 }
4719
4720                 upcoming_state = port->upcoming_state;
4721                 port->upcoming_state = INVALID_STATE;
4722                 tcpm_set_state(port, upcoming_state, 0);
4723                 break;
4724
4725         /* Chunk state */
4726         case CHUNK_NOT_SUPP:
4727                 tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
4728                 tcpm_set_state(port, port->pwr_role == TYPEC_SOURCE ? SRC_READY : SNK_READY, 0);
4729                 break;
4730         default:
4731                 WARN(1, "Unexpected port state %d\n", port->state);
4732                 break;
4733         }
4734 }
4735
4736 static void tcpm_state_machine_work(struct kthread_work *work)
4737 {
4738         struct tcpm_port *port = container_of(work, struct tcpm_port, state_machine);
4739         enum tcpm_state prev_state;
4740
4741         mutex_lock(&port->lock);
4742         port->state_machine_running = true;
4743
4744         if (port->queued_message && tcpm_send_queued_message(port))
4745                 goto done;
4746
4747         /* If we were queued due to a delayed state change, update it now */
4748         if (port->delayed_state) {
4749                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
4750                          tcpm_states[port->state],
4751                          tcpm_states[port->delayed_state], port->delay_ms);
4752                 port->prev_state = port->state;
4753                 port->state = port->delayed_state;
4754                 port->delayed_state = INVALID_STATE;
4755         }
4756
4757         /*
4758          * Continue running as long as we have (non-delayed) state changes
4759          * to make.
4760          */
4761         do {
4762                 prev_state = port->state;
4763                 run_state_machine(port);
4764                 if (port->queued_message)
4765                         tcpm_send_queued_message(port);
4766         } while (port->state != prev_state && !port->delayed_state);
4767
4768 done:
4769         port->state_machine_running = false;
4770         mutex_unlock(&port->lock);
4771 }
4772
4773 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
4774                             enum typec_cc_status cc2)
4775 {
4776         enum typec_cc_status old_cc1, old_cc2;
4777         enum tcpm_state new_state;
4778
4779         old_cc1 = port->cc1;
4780         old_cc2 = port->cc2;
4781         port->cc1 = cc1;
4782         port->cc2 = cc2;
4783
4784         tcpm_log_force(port,
4785                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
4786                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
4787                        port->polarity,
4788                        tcpm_port_is_disconnected(port) ? "disconnected"
4789                                                        : "connected");
4790
4791         switch (port->state) {
4792         case TOGGLING:
4793                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4794                     tcpm_port_is_source(port))
4795                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4796                 else if (tcpm_port_is_sink(port))
4797                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4798                 break;
4799         case SRC_UNATTACHED:
4800         case ACC_UNATTACHED:
4801                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
4802                     tcpm_port_is_source(port))
4803                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4804                 break;
4805         case SRC_ATTACH_WAIT:
4806                 if (tcpm_port_is_disconnected(port) ||
4807                     tcpm_port_is_audio_detached(port))
4808                         tcpm_set_state(port, SRC_UNATTACHED, 0);
4809                 else if (cc1 != old_cc1 || cc2 != old_cc2)
4810                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
4811                 break;
4812         case SRC_ATTACHED:
4813         case SRC_SEND_CAPABILITIES:
4814         case SRC_READY:
4815                 if (tcpm_port_is_disconnected(port) ||
4816                     !tcpm_port_is_source(port)) {
4817                         if (port->port_type == TYPEC_PORT_SRC)
4818                                 tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
4819                         else
4820                                 tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
4821                 }
4822                 break;
4823         case SNK_UNATTACHED:
4824                 if (tcpm_port_is_sink(port))
4825                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4826                 break;
4827         case SNK_ATTACH_WAIT:
4828                 if ((port->cc1 == TYPEC_CC_OPEN &&
4829                      port->cc2 != TYPEC_CC_OPEN) ||
4830                     (port->cc1 != TYPEC_CC_OPEN &&
4831                      port->cc2 == TYPEC_CC_OPEN))
4832                         new_state = SNK_DEBOUNCED;
4833                 else if (tcpm_port_is_disconnected(port))
4834                         new_state = SNK_UNATTACHED;
4835                 else
4836                         break;
4837                 if (new_state != port->delayed_state)
4838                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
4839                 break;
4840         case SNK_DEBOUNCED:
4841                 if (tcpm_port_is_disconnected(port))
4842                         new_state = SNK_UNATTACHED;
4843                 else if (port->vbus_present)
4844                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
4845                 else
4846                         new_state = SNK_UNATTACHED;
4847                 if (new_state != port->delayed_state)
4848                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
4849                 break;
4850         case SNK_READY:
4851                 /*
4852                  * EXIT condition is based primarily on vbus disconnect and CC is secondary.
4853                  * "A port that has entered into USB PD communications with the Source and
4854                  * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
4855                  * cable disconnect in addition to monitoring VBUS.
4856                  *
4857                  * A port that is monitoring the CC voltage for disconnect (but is not in
4858                  * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
4859                  * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
4860                  * vRd-USB for tPDDebounce."
4861                  *
4862                  * When set_auto_vbus_discharge_threshold is enabled, CC pins go
4863                  * away before vbus decays to disconnect threshold. Allow
4864                  * disconnect to be driven by vbus disconnect when auto vbus
4865                  * discharge is enabled.
4866                  */
4867                 if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
4868                         tcpm_set_state(port, unattached_state(port), 0);
4869                 else if (!port->pd_capable &&
4870                          (cc1 != old_cc1 || cc2 != old_cc2))
4871                         tcpm_set_current_limit(port,
4872                                                tcpm_get_current_limit(port),
4873                                                5000);
4874                 break;
4875
4876         case AUDIO_ACC_ATTACHED:
4877                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
4878                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
4879                 break;
4880         case AUDIO_ACC_DEBOUNCE:
4881                 if (tcpm_port_is_audio(port))
4882                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
4883                 break;
4884
4885         case DEBUG_ACC_ATTACHED:
4886                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
4887                         tcpm_set_state(port, ACC_UNATTACHED, 0);
4888                 break;
4889
4890         case SNK_TRY:
4891                 /* Do nothing, waiting for timeout */
4892                 break;
4893
4894         case SNK_DISCOVERY:
4895                 /* CC line is unstable, wait for debounce */
4896                 if (tcpm_port_is_disconnected(port))
4897                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
4898                 break;
4899         case SNK_DISCOVERY_DEBOUNCE:
4900                 break;
4901
4902         case SRC_TRYWAIT:
4903                 /* Hand over to state machine if needed */
4904                 if (!port->vbus_present && tcpm_port_is_source(port))
4905                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
4906                 break;
4907         case SRC_TRYWAIT_DEBOUNCE:
4908                 if (port->vbus_present || !tcpm_port_is_source(port))
4909                         tcpm_set_state(port, SRC_TRYWAIT, 0);
4910                 break;
4911         case SNK_TRY_WAIT_DEBOUNCE:
4912                 if (!tcpm_port_is_sink(port)) {
4913                         port->max_wait = 0;
4914                         tcpm_set_state(port, SRC_TRYWAIT, 0);
4915                 }
4916                 break;
4917         case SRC_TRY_WAIT:
4918                 if (tcpm_port_is_source(port))
4919                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
4920                 break;
4921         case SRC_TRY_DEBOUNCE:
4922                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
4923                 break;
4924         case SNK_TRYWAIT_DEBOUNCE:
4925                 if (tcpm_port_is_sink(port))
4926                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
4927                 break;
4928         case SNK_TRYWAIT_VBUS:
4929                 if (!tcpm_port_is_sink(port))
4930                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
4931                 break;
4932         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
4933                 if (!tcpm_port_is_sink(port))
4934                         tcpm_set_state(port, SRC_TRYWAIT, PD_T_TRY_CC_DEBOUNCE);
4935                 else
4936                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS, 0);
4937                 break;
4938         case SNK_TRYWAIT:
4939                 /* Do nothing, waiting for tCCDebounce */
4940                 break;
4941         case PR_SWAP_SNK_SRC_SINK_OFF:
4942         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
4943         case PR_SWAP_SRC_SNK_SOURCE_OFF:
4944         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
4945         case PR_SWAP_SNK_SRC_SOURCE_ON:
4946                 /*
4947                  * CC state change is expected in PR_SWAP
4948                  * Ignore it.
4949                  */
4950                 break;
4951         case FR_SWAP_SEND:
4952         case FR_SWAP_SEND_TIMEOUT:
4953         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
4954         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
4955         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
4956                 /* Do nothing, CC change expected */
4957                 break;
4958
4959         case PORT_RESET:
4960         case PORT_RESET_WAIT_OFF:
4961                 /*
4962                  * State set back to default mode once the timer completes.
4963                  * Ignore CC changes here.
4964                  */
4965                 break;
4966         default:
4967                 /*
4968                  * While acting as sink and auto vbus discharge is enabled, Allow disconnect
4969                  * to be driven by vbus disconnect.
4970                  */
4971                 if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
4972                                                          port->auto_vbus_discharge_enabled))
4973                         tcpm_set_state(port, unattached_state(port), 0);
4974                 break;
4975         }
4976 }
4977
4978 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
4979 {
4980         tcpm_log_force(port, "VBUS on");
4981         port->vbus_present = true;
4982         /*
4983          * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
4984          * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
4985          */
4986         port->vbus_vsafe0v = false;
4987
4988         switch (port->state) {
4989         case SNK_TRANSITION_SINK_VBUS:
4990                 port->explicit_contract = true;
4991                 /* Set the VDM flag ASAP */
4992                 if (port->data_role == TYPEC_HOST && port->send_discover)
4993                         port->vdm_sm_running = true;
4994                 tcpm_set_state(port, SNK_READY, 0);
4995                 break;
4996         case SNK_DISCOVERY:
4997                 tcpm_set_state(port, SNK_DISCOVERY, 0);
4998                 break;
4999
5000         case SNK_DEBOUNCED:
5001                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
5002                                                         : SNK_ATTACHED,
5003                                        0);
5004                 break;
5005         case SNK_HARD_RESET_WAIT_VBUS:
5006                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
5007                 break;
5008         case SRC_ATTACHED:
5009                 tcpm_set_state(port, SRC_STARTUP, 0);
5010                 break;
5011         case SRC_HARD_RESET_VBUS_ON:
5012                 tcpm_set_state(port, SRC_STARTUP, 0);
5013                 break;
5014
5015         case SNK_TRY:
5016                 /* Do nothing, waiting for timeout */
5017                 break;
5018         case SRC_TRYWAIT:
5019                 /* Do nothing, Waiting for Rd to be detected */
5020                 break;
5021         case SRC_TRYWAIT_DEBOUNCE:
5022                 tcpm_set_state(port, SRC_TRYWAIT, 0);
5023                 break;
5024         case SNK_TRY_WAIT_DEBOUNCE:
5025                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5026                 break;
5027         case SNK_TRYWAIT:
5028                 /* Do nothing, waiting for tCCDebounce */
5029                 break;
5030         case SNK_TRYWAIT_VBUS:
5031                 if (tcpm_port_is_sink(port))
5032                         tcpm_set_state(port, SNK_ATTACHED, 0);
5033                 break;
5034         case SNK_TRYWAIT_DEBOUNCE:
5035                 /* Do nothing, waiting for Rp */
5036                 break;
5037         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
5038                 if (port->vbus_present && tcpm_port_is_sink(port))
5039                         tcpm_set_state(port, SNK_ATTACHED, 0);
5040                 break;
5041         case SRC_TRY_WAIT:
5042         case SRC_TRY_DEBOUNCE:
5043                 /* Do nothing, waiting for sink detection */
5044                 break;
5045         case FR_SWAP_SEND:
5046         case FR_SWAP_SEND_TIMEOUT:
5047         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5048         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5049                 if (port->tcpc->frs_sourcing_vbus)
5050                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5051                 break;
5052         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5053                 if (port->tcpc->frs_sourcing_vbus)
5054                         port->tcpc->frs_sourcing_vbus(port->tcpc);
5055                 tcpm_set_state(port, FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED, 0);
5056                 break;
5057
5058         case PORT_RESET:
5059         case PORT_RESET_WAIT_OFF:
5060                 /*
5061                  * State set back to default mode once the timer completes.
5062                  * Ignore vbus changes here.
5063                  */
5064                 break;
5065
5066         default:
5067                 break;
5068         }
5069 }
5070
5071 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
5072 {
5073         tcpm_log_force(port, "VBUS off");
5074         port->vbus_present = false;
5075         port->vbus_never_low = false;
5076         switch (port->state) {
5077         case SNK_HARD_RESET_SINK_OFF:
5078                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
5079                 break;
5080         case HARD_RESET_SEND:
5081                 break;
5082         case SNK_TRY:
5083                 /* Do nothing, waiting for timeout */
5084                 break;
5085         case SRC_TRYWAIT:
5086                 /* Hand over to state machine if needed */
5087                 if (tcpm_port_is_source(port))
5088                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
5089                 break;
5090         case SNK_TRY_WAIT_DEBOUNCE:
5091                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
5092                 break;
5093         case SNK_TRYWAIT:
5094         case SNK_TRYWAIT_VBUS:
5095         case SNK_TRYWAIT_DEBOUNCE:
5096                 break;
5097         case SNK_ATTACH_WAIT:
5098                 tcpm_set_state(port, SNK_UNATTACHED, 0);
5099                 break;
5100
5101         case SNK_NEGOTIATE_CAPABILITIES:
5102                 break;
5103
5104         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
5105                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
5106                 break;
5107
5108         case PR_SWAP_SNK_SRC_SINK_OFF:
5109                 /* Do nothing, expected */
5110                 break;
5111
5112         case PR_SWAP_SNK_SRC_SOURCE_ON:
5113                 /*
5114                  * Do nothing when vbus off notification is received.
5115                  * TCPM can wait for PD_T_NEWSRC in PR_SWAP_SNK_SRC_SOURCE_ON
5116                  * for the vbus source to ramp up.
5117                  */
5118                 break;
5119
5120         case PORT_RESET_WAIT_OFF:
5121                 tcpm_set_state(port, tcpm_default_state(port), 0);
5122                 break;
5123
5124         case SRC_TRY_WAIT:
5125         case SRC_TRY_DEBOUNCE:
5126                 /* Do nothing, waiting for sink detection */
5127                 break;
5128
5129         case SRC_STARTUP:
5130         case SRC_SEND_CAPABILITIES:
5131         case SRC_SEND_CAPABILITIES_TIMEOUT:
5132         case SRC_NEGOTIATE_CAPABILITIES:
5133         case SRC_TRANSITION_SUPPLY:
5134         case SRC_READY:
5135         case SRC_WAIT_NEW_CAPABILITIES:
5136                 /*
5137                  * Force to unattached state to re-initiate connection.
5138                  * DRP port should move to Unattached.SNK instead of Unattached.SRC if
5139                  * sink removed. Although sink removal here is due to source's vbus collapse,
5140                  * treat it the same way for consistency.
5141                  */
5142                 if (port->port_type == TYPEC_PORT_SRC)
5143                         tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
5144                 else
5145                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5146                 break;
5147
5148         case PORT_RESET:
5149                 /*
5150                  * State set back to default mode once the timer completes.
5151                  * Ignore vbus changes here.
5152                  */
5153                 break;
5154
5155         case FR_SWAP_SEND:
5156         case FR_SWAP_SEND_TIMEOUT:
5157         case FR_SWAP_SNK_SRC_TRANSITION_TO_OFF:
5158         case FR_SWAP_SNK_SRC_NEW_SINK_READY:
5159         case FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED:
5160                 /* Do nothing, vbus drop expected */
5161                 break;
5162
5163         default:
5164                 if (port->pwr_role == TYPEC_SINK && port->attached)
5165                         tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
5166                 break;
5167         }
5168 }
5169
5170 static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
5171 {
5172         tcpm_log_force(port, "VBUS VSAFE0V");
5173         port->vbus_vsafe0v = true;
5174         switch (port->state) {
5175         case SRC_HARD_RESET_VBUS_OFF:
5176                 /*
5177                  * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait
5178                  * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V.
5179                  */
5180                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
5181                 break;
5182         case SRC_ATTACH_WAIT:
5183                 if (tcpm_port_is_source(port))
5184                         tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
5185                                        PD_T_CC_DEBOUNCE);
5186                 break;
5187         case SRC_STARTUP:
5188         case SRC_SEND_CAPABILITIES:
5189         case SRC_SEND_CAPABILITIES_TIMEOUT:
5190         case SRC_NEGOTIATE_CAPABILITIES:
5191         case SRC_TRANSITION_SUPPLY:
5192         case SRC_READY:
5193         case SRC_WAIT_NEW_CAPABILITIES:
5194                 if (port->auto_vbus_discharge_enabled) {
5195                         if (port->port_type == TYPEC_PORT_SRC)
5196                                 tcpm_set_state(port, SRC_UNATTACHED, 0);
5197                         else
5198                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
5199                 }
5200                 break;
5201         default:
5202                 if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
5203                         tcpm_set_state(port, SNK_UNATTACHED, 0);
5204                 break;
5205         }
5206 }
5207
5208 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
5209 {
5210         tcpm_log_force(port, "Received hard reset");
5211         if (port->bist_request == BDO_MODE_TESTDATA && port->tcpc->set_bist_data)
5212                 port->tcpc->set_bist_data(port->tcpc, false);
5213
5214         if (port->ams != NONE_AMS)
5215                 port->ams = NONE_AMS;
5216         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
5217                 port->ams = HARD_RESET;
5218         /*
5219          * If we keep receiving hard reset requests, executing the hard reset
5220          * must have failed. Revert to error recovery if that happens.
5221          */
5222         tcpm_set_state(port,
5223                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
5224                                 HARD_RESET_START : ERROR_RECOVERY,
5225                        0);
5226 }
5227
5228 static void tcpm_pd_event_handler(struct kthread_work *work)
5229 {
5230         struct tcpm_port *port = container_of(work, struct tcpm_port,
5231                                               event_work);
5232         u32 events;
5233
5234         mutex_lock(&port->lock);
5235
5236         spin_lock(&port->pd_event_lock);
5237         while (port->pd_events) {
5238                 events = port->pd_events;
5239                 port->pd_events = 0;
5240                 spin_unlock(&port->pd_event_lock);
5241                 if (events & TCPM_RESET_EVENT)
5242                         _tcpm_pd_hard_reset(port);
5243                 if (events & TCPM_VBUS_EVENT) {
5244                         bool vbus;
5245
5246                         vbus = port->tcpc->get_vbus(port->tcpc);
5247                         if (vbus) {
5248                                 _tcpm_pd_vbus_on(port);
5249                         } else {
5250                                 _tcpm_pd_vbus_off(port);
5251                                 /*
5252                                  * When TCPC does not support detecting vsafe0v voltage level,
5253                                  * treat vbus absent as vsafe0v. Else invoke is_vbus_vsafe0v
5254                                  * to see if vbus has discharge to VSAFE0V.
5255                                  */
5256                                 if (!port->tcpc->is_vbus_vsafe0v ||
5257                                     port->tcpc->is_vbus_vsafe0v(port->tcpc))
5258                                         _tcpm_pd_vbus_vsafe0v(port);
5259                         }
5260                 }
5261                 if (events & TCPM_CC_EVENT) {
5262                         enum typec_cc_status cc1, cc2;
5263
5264                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5265                                 _tcpm_cc_change(port, cc1, cc2);
5266                 }
5267                 if (events & TCPM_FRS_EVENT) {
5268                         if (port->state == SNK_READY) {
5269                                 int ret;
5270
5271                                 port->upcoming_state = FR_SWAP_SEND;
5272                                 ret = tcpm_ams_start(port, FAST_ROLE_SWAP);
5273                                 if (ret == -EAGAIN)
5274                                         port->upcoming_state = INVALID_STATE;
5275                         } else {
5276                                 tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
5277                         }
5278                 }
5279                 if (events & TCPM_SOURCING_VBUS) {
5280                         tcpm_log(port, "sourcing vbus");
5281                         /*
5282                          * In fast role swap case TCPC autonomously sources vbus. Set vbus_source
5283                          * true as TCPM wouldn't have called tcpm_set_vbus.
5284                          *
5285                          * When vbus is sourced on the command on TCPM i.e. TCPM called
5286                          * tcpm_set_vbus to source vbus, vbus_source would already be true.
5287                          */
5288                         port->vbus_source = true;
5289                         _tcpm_pd_vbus_on(port);
5290                 }
5291
5292                 spin_lock(&port->pd_event_lock);
5293         }
5294         spin_unlock(&port->pd_event_lock);
5295         mutex_unlock(&port->lock);
5296 }
5297
5298 void tcpm_cc_change(struct tcpm_port *port)
5299 {
5300         spin_lock(&port->pd_event_lock);
5301         port->pd_events |= TCPM_CC_EVENT;
5302         spin_unlock(&port->pd_event_lock);
5303         kthread_queue_work(port->wq, &port->event_work);
5304 }
5305 EXPORT_SYMBOL_GPL(tcpm_cc_change);
5306
5307 void tcpm_vbus_change(struct tcpm_port *port)
5308 {
5309         spin_lock(&port->pd_event_lock);
5310         port->pd_events |= TCPM_VBUS_EVENT;
5311         spin_unlock(&port->pd_event_lock);
5312         kthread_queue_work(port->wq, &port->event_work);
5313 }
5314 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
5315
5316 void tcpm_pd_hard_reset(struct tcpm_port *port)
5317 {
5318         spin_lock(&port->pd_event_lock);
5319         port->pd_events = TCPM_RESET_EVENT;
5320         spin_unlock(&port->pd_event_lock);
5321         kthread_queue_work(port->wq, &port->event_work);
5322 }
5323 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
5324
5325 void tcpm_sink_frs(struct tcpm_port *port)
5326 {
5327         spin_lock(&port->pd_event_lock);
5328         port->pd_events = TCPM_FRS_EVENT;
5329         spin_unlock(&port->pd_event_lock);
5330         kthread_queue_work(port->wq, &port->event_work);
5331 }
5332 EXPORT_SYMBOL_GPL(tcpm_sink_frs);
5333
5334 void tcpm_sourcing_vbus(struct tcpm_port *port)
5335 {
5336         spin_lock(&port->pd_event_lock);
5337         port->pd_events = TCPM_SOURCING_VBUS;
5338         spin_unlock(&port->pd_event_lock);
5339         kthread_queue_work(port->wq, &port->event_work);
5340 }
5341 EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus);
5342
5343 static void tcpm_enable_frs_work(struct kthread_work *work)
5344 {
5345         struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);
5346         int ret;
5347
5348         mutex_lock(&port->lock);
5349         /* Not FRS capable */
5350         if (!port->connected || port->port_type != TYPEC_PORT_DRP ||
5351             port->pwr_opmode != TYPEC_PWR_MODE_PD ||
5352             !port->tcpc->enable_frs ||
5353             /* Sink caps queried */
5354             port->sink_cap_done || port->negotiated_rev < PD_REV30)
5355                 goto unlock;
5356
5357         /* Send when the state machine is idle */
5358         if (port->state != SNK_READY || port->vdm_sm_running || port->send_discover)
5359                 goto resched;
5360
5361         port->upcoming_state = GET_SINK_CAP;
5362         ret = tcpm_ams_start(port, GET_SINK_CAPABILITIES);
5363         if (ret == -EAGAIN) {
5364                 port->upcoming_state = INVALID_STATE;
5365         } else {
5366                 port->sink_cap_done = true;
5367                 goto unlock;
5368         }
5369 resched:
5370         mod_enable_frs_delayed_work(port, GET_SINK_CAP_RETRY_MS);
5371 unlock:
5372         mutex_unlock(&port->lock);
5373 }
5374
5375 static void tcpm_send_discover_work(struct kthread_work *work)
5376 {
5377         struct tcpm_port *port = container_of(work, struct tcpm_port, send_discover_work);
5378
5379         mutex_lock(&port->lock);
5380         /* No need to send DISCOVER_IDENTITY anymore */
5381         if (!port->send_discover)
5382                 goto unlock;
5383
5384         /* Retry if the port is not idle */
5385         if ((port->state != SRC_READY && port->state != SNK_READY) || port->vdm_sm_running) {
5386                 mod_send_discover_delayed_work(port, SEND_DISCOVER_RETRY_MS);
5387                 goto unlock;
5388         }
5389
5390         /* Only send the Message if the port is host for PD rev2.0 */
5391         if (port->data_role == TYPEC_HOST || port->negotiated_rev > PD_REV20)
5392                 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
5393
5394 unlock:
5395         mutex_unlock(&port->lock);
5396 }
5397
5398 static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
5399 {
5400         struct tcpm_port *port = typec_get_drvdata(p);
5401         int ret;
5402
5403         mutex_lock(&port->swap_lock);
5404         mutex_lock(&port->lock);
5405
5406         if (port->typec_caps.data != TYPEC_PORT_DRD) {
5407                 ret = -EINVAL;
5408                 goto port_unlock;
5409         }
5410         if (port->state != SRC_READY && port->state != SNK_READY) {
5411                 ret = -EAGAIN;
5412                 goto port_unlock;
5413         }
5414
5415         if (port->data_role == data) {
5416                 ret = 0;
5417                 goto port_unlock;
5418         }
5419
5420         /*
5421          * XXX
5422          * 6.3.9: If an alternate mode is active, a request to swap
5423          * alternate modes shall trigger a port reset.
5424          * Reject data role swap request in this case.
5425          */
5426
5427         if (!port->pd_capable) {
5428                 /*
5429                  * If the partner is not PD capable, reset the port to
5430                  * trigger a role change. This can only work if a preferred
5431                  * role is configured, and if it matches the requested role.
5432                  */
5433                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
5434                     port->try_role == port->pwr_role) {
5435                         ret = -EINVAL;
5436                         goto port_unlock;
5437                 }
5438                 port->non_pd_role_swap = true;
5439                 tcpm_set_state(port, PORT_RESET, 0);
5440         } else {
5441                 port->upcoming_state = DR_SWAP_SEND;
5442                 ret = tcpm_ams_start(port, DATA_ROLE_SWAP);
5443                 if (ret == -EAGAIN) {
5444                         port->upcoming_state = INVALID_STATE;
5445                         goto port_unlock;
5446                 }
5447         }
5448
5449         port->swap_status = 0;
5450         port->swap_pending = true;
5451         reinit_completion(&port->swap_complete);
5452         mutex_unlock(&port->lock);
5453
5454         if (!wait_for_completion_timeout(&port->swap_complete,
5455                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5456                 ret = -ETIMEDOUT;
5457         else
5458                 ret = port->swap_status;
5459
5460         port->non_pd_role_swap = false;
5461         goto swap_unlock;
5462
5463 port_unlock:
5464         mutex_unlock(&port->lock);
5465 swap_unlock:
5466         mutex_unlock(&port->swap_lock);
5467         return ret;
5468 }
5469
5470 static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
5471 {
5472         struct tcpm_port *port = typec_get_drvdata(p);
5473         int ret;
5474
5475         mutex_lock(&port->swap_lock);
5476         mutex_lock(&port->lock);
5477
5478         if (port->port_type != TYPEC_PORT_DRP) {
5479                 ret = -EINVAL;
5480                 goto port_unlock;
5481         }
5482         if (port->state != SRC_READY && port->state != SNK_READY) {
5483                 ret = -EAGAIN;
5484                 goto port_unlock;
5485         }
5486
5487         if (role == port->pwr_role) {
5488                 ret = 0;
5489                 goto port_unlock;
5490         }
5491
5492         port->upcoming_state = PR_SWAP_SEND;
5493         ret = tcpm_ams_start(port, POWER_ROLE_SWAP);
5494         if (ret == -EAGAIN) {
5495                 port->upcoming_state = INVALID_STATE;
5496                 goto port_unlock;
5497         }
5498
5499         port->swap_status = 0;
5500         port->swap_pending = true;
5501         reinit_completion(&port->swap_complete);
5502         mutex_unlock(&port->lock);
5503
5504         if (!wait_for_completion_timeout(&port->swap_complete,
5505                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5506                 ret = -ETIMEDOUT;
5507         else
5508                 ret = port->swap_status;
5509
5510         goto swap_unlock;
5511
5512 port_unlock:
5513         mutex_unlock(&port->lock);
5514 swap_unlock:
5515         mutex_unlock(&port->swap_lock);
5516         return ret;
5517 }
5518
5519 static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
5520 {
5521         struct tcpm_port *port = typec_get_drvdata(p);
5522         int ret;
5523
5524         mutex_lock(&port->swap_lock);
5525         mutex_lock(&port->lock);
5526
5527         if (port->state != SRC_READY && port->state != SNK_READY) {
5528                 ret = -EAGAIN;
5529                 goto port_unlock;
5530         }
5531
5532         if (role == port->vconn_role) {
5533                 ret = 0;
5534                 goto port_unlock;
5535         }
5536
5537         port->upcoming_state = VCONN_SWAP_SEND;
5538         ret = tcpm_ams_start(port, VCONN_SWAP);
5539         if (ret == -EAGAIN) {
5540                 port->upcoming_state = INVALID_STATE;
5541                 goto port_unlock;
5542         }
5543
5544         port->swap_status = 0;
5545         port->swap_pending = true;
5546         reinit_completion(&port->swap_complete);
5547         mutex_unlock(&port->lock);
5548
5549         if (!wait_for_completion_timeout(&port->swap_complete,
5550                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
5551                 ret = -ETIMEDOUT;
5552         else
5553                 ret = port->swap_status;
5554
5555         goto swap_unlock;
5556
5557 port_unlock:
5558         mutex_unlock(&port->lock);
5559 swap_unlock:
5560         mutex_unlock(&port->swap_lock);
5561         return ret;
5562 }
5563
5564 static int tcpm_try_role(struct typec_port *p, int role)
5565 {
5566         struct tcpm_port *port = typec_get_drvdata(p);
5567         struct tcpc_dev *tcpc = port->tcpc;
5568         int ret = 0;
5569
5570         mutex_lock(&port->lock);
5571         if (tcpc->try_role)
5572                 ret = tcpc->try_role(tcpc, role);
5573         if (!ret)
5574                 port->try_role = role;
5575         port->try_src_count = 0;
5576         port->try_snk_count = 0;
5577         mutex_unlock(&port->lock);
5578
5579         return ret;
5580 }
5581
5582 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 req_op_curr)
5583 {
5584         unsigned int target_mw;
5585         int ret;
5586
5587         mutex_lock(&port->swap_lock);
5588         mutex_lock(&port->lock);
5589
5590         if (!port->pps_data.active) {
5591                 ret = -EOPNOTSUPP;
5592                 goto port_unlock;
5593         }
5594
5595         if (port->state != SNK_READY) {
5596                 ret = -EAGAIN;
5597                 goto port_unlock;
5598         }
5599
5600         if (req_op_curr > port->pps_data.max_curr) {
5601                 ret = -EINVAL;
5602                 goto port_unlock;
5603         }
5604
5605         target_mw = (req_op_curr * port->supply_voltage) / 1000;
5606         if (target_mw < port->operating_snk_mw) {
5607                 ret = -EINVAL;
5608                 goto port_unlock;
5609         }
5610
5611         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5612         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5613         if (ret == -EAGAIN) {
5614                 port->upcoming_state = INVALID_STATE;
5615                 goto port_unlock;
5616         }
5617
5618         /* Round down operating current to align with PPS valid steps */
5619         req_op_curr = req_op_curr - (req_op_curr % RDO_PROG_CURR_MA_STEP);
5620
5621         reinit_completion(&port->pps_complete);
5622         port->pps_data.req_op_curr = req_op_curr;
5623         port->pps_status = 0;
5624         port->pps_pending = true;
5625         mutex_unlock(&port->lock);
5626
5627         if (!wait_for_completion_timeout(&port->pps_complete,
5628                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5629                 ret = -ETIMEDOUT;
5630         else
5631                 ret = port->pps_status;
5632
5633         goto swap_unlock;
5634
5635 port_unlock:
5636         mutex_unlock(&port->lock);
5637 swap_unlock:
5638         mutex_unlock(&port->swap_lock);
5639
5640         return ret;
5641 }
5642
5643 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 req_out_volt)
5644 {
5645         unsigned int target_mw;
5646         int ret;
5647
5648         mutex_lock(&port->swap_lock);
5649         mutex_lock(&port->lock);
5650
5651         if (!port->pps_data.active) {
5652                 ret = -EOPNOTSUPP;
5653                 goto port_unlock;
5654         }
5655
5656         if (port->state != SNK_READY) {
5657                 ret = -EAGAIN;
5658                 goto port_unlock;
5659         }
5660
5661         if (req_out_volt < port->pps_data.min_volt ||
5662             req_out_volt > port->pps_data.max_volt) {
5663                 ret = -EINVAL;
5664                 goto port_unlock;
5665         }
5666
5667         target_mw = (port->current_limit * req_out_volt) / 1000;
5668         if (target_mw < port->operating_snk_mw) {
5669                 ret = -EINVAL;
5670                 goto port_unlock;
5671         }
5672
5673         port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5674         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5675         if (ret == -EAGAIN) {
5676                 port->upcoming_state = INVALID_STATE;
5677                 goto port_unlock;
5678         }
5679
5680         /* Round down output voltage to align with PPS valid steps */
5681         req_out_volt = req_out_volt - (req_out_volt % RDO_PROG_VOLT_MV_STEP);
5682
5683         reinit_completion(&port->pps_complete);
5684         port->pps_data.req_out_volt = req_out_volt;
5685         port->pps_status = 0;
5686         port->pps_pending = true;
5687         mutex_unlock(&port->lock);
5688
5689         if (!wait_for_completion_timeout(&port->pps_complete,
5690                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5691                 ret = -ETIMEDOUT;
5692         else
5693                 ret = port->pps_status;
5694
5695         goto swap_unlock;
5696
5697 port_unlock:
5698         mutex_unlock(&port->lock);
5699 swap_unlock:
5700         mutex_unlock(&port->swap_lock);
5701
5702         return ret;
5703 }
5704
5705 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
5706 {
5707         int ret = 0;
5708
5709         mutex_lock(&port->swap_lock);
5710         mutex_lock(&port->lock);
5711
5712         if (!port->pps_data.supported) {
5713                 ret = -EOPNOTSUPP;
5714                 goto port_unlock;
5715         }
5716
5717         /* Trying to deactivate PPS when already deactivated so just bail */
5718         if (!port->pps_data.active && !activate)
5719                 goto port_unlock;
5720
5721         if (port->state != SNK_READY) {
5722                 ret = -EAGAIN;
5723                 goto port_unlock;
5724         }
5725
5726         if (activate)
5727                 port->upcoming_state = SNK_NEGOTIATE_PPS_CAPABILITIES;
5728         else
5729                 port->upcoming_state = SNK_NEGOTIATE_CAPABILITIES;
5730         ret = tcpm_ams_start(port, POWER_NEGOTIATION);
5731         if (ret == -EAGAIN) {
5732                 port->upcoming_state = INVALID_STATE;
5733                 goto port_unlock;
5734         }
5735
5736         reinit_completion(&port->pps_complete);
5737         port->pps_status = 0;
5738         port->pps_pending = true;
5739
5740         /* Trigger PPS request or move back to standard PDO contract */
5741         if (activate) {
5742                 port->pps_data.req_out_volt = port->supply_voltage;
5743                 port->pps_data.req_op_curr = port->current_limit;
5744         }
5745         mutex_unlock(&port->lock);
5746
5747         if (!wait_for_completion_timeout(&port->pps_complete,
5748                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
5749                 ret = -ETIMEDOUT;
5750         else
5751                 ret = port->pps_status;
5752
5753         goto swap_unlock;
5754
5755 port_unlock:
5756         mutex_unlock(&port->lock);
5757 swap_unlock:
5758         mutex_unlock(&port->swap_lock);
5759
5760         return ret;
5761 }
5762
5763 static void tcpm_init(struct tcpm_port *port)
5764 {
5765         enum typec_cc_status cc1, cc2;
5766
5767         port->tcpc->init(port->tcpc);
5768
5769         tcpm_reset_port(port);
5770
5771         /*
5772          * XXX
5773          * Should possibly wait for VBUS to settle if it was enabled locally
5774          * since tcpm_reset_port() will disable VBUS.
5775          */
5776         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
5777         if (port->vbus_present)
5778                 port->vbus_never_low = true;
5779
5780         /*
5781          * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
5782          * So implicitly vbus_vsafe0v = false.
5783          *
5784          * 2. When vbus_present is false and TCPC does NOT support querying
5785          * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
5786          * vbus_vsafe0v is true.
5787          *
5788          * 3. When vbus_present is false and TCPC does support querying vsafe0v,
5789          * then, query tcpc for vsafe0v status.
5790          */
5791         if (port->vbus_present)
5792                 port->vbus_vsafe0v = false;
5793         else if (!port->tcpc->is_vbus_vsafe0v)
5794                 port->vbus_vsafe0v = true;
5795         else
5796                 port->vbus_vsafe0v = port->tcpc->is_vbus_vsafe0v(port->tcpc);
5797
5798         tcpm_set_state(port, tcpm_default_state(port), 0);
5799
5800         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
5801                 _tcpm_cc_change(port, cc1, cc2);
5802
5803         /*
5804          * Some adapters need a clean slate at startup, and won't recover
5805          * otherwise. So do not try to be fancy and force a clean disconnect.
5806          */
5807         tcpm_set_state(port, PORT_RESET, 0);
5808 }
5809
5810 static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
5811 {
5812         struct tcpm_port *port = typec_get_drvdata(p);
5813
5814         mutex_lock(&port->lock);
5815         if (type == port->port_type)
5816                 goto port_unlock;
5817
5818         port->port_type = type;
5819
5820         if (!port->connected) {
5821                 tcpm_set_state(port, PORT_RESET, 0);
5822         } else if (type == TYPEC_PORT_SNK) {
5823                 if (!(port->pwr_role == TYPEC_SINK &&
5824                       port->data_role == TYPEC_DEVICE))
5825                         tcpm_set_state(port, PORT_RESET, 0);
5826         } else if (type == TYPEC_PORT_SRC) {
5827                 if (!(port->pwr_role == TYPEC_SOURCE &&
5828                       port->data_role == TYPEC_HOST))
5829                         tcpm_set_state(port, PORT_RESET, 0);
5830         }
5831
5832 port_unlock:
5833         mutex_unlock(&port->lock);
5834         return 0;
5835 }
5836
5837 static const struct typec_operations tcpm_ops = {
5838         .try_role = tcpm_try_role,
5839         .dr_set = tcpm_dr_set,
5840         .pr_set = tcpm_pr_set,
5841         .vconn_set = tcpm_vconn_set,
5842         .port_type_set = tcpm_port_type_set
5843 };
5844
5845 void tcpm_tcpc_reset(struct tcpm_port *port)
5846 {
5847         mutex_lock(&port->lock);
5848         /* XXX: Maintain PD connection if possible? */
5849         tcpm_init(port);
5850         mutex_unlock(&port->lock);
5851 }
5852 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
5853
5854 static int tcpm_fw_get_caps(struct tcpm_port *port,
5855                             struct fwnode_handle *fwnode)
5856 {
5857         const char *cap_str;
5858         int ret;
5859         u32 mw, frs_current;
5860
5861         if (!fwnode)
5862                 return -EINVAL;
5863
5864         /*
5865          * This fwnode has a "compatible" property, but is never populated as a
5866          * struct device. Instead we simply parse it to read the properties.
5867          * This it breaks fw_devlink=on. To maintain backward compatibility
5868          * with existing DT files, we work around this by deleting any
5869          * fwnode_links to/from this fwnode.
5870          */
5871         fw_devlink_purge_absent_suppliers(fwnode);
5872
5873         /* USB data support is optional */
5874         ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
5875         if (ret == 0) {
5876                 ret = typec_find_port_data_role(cap_str);
5877                 if (ret < 0)
5878                         return ret;
5879                 port->typec_caps.data = ret;
5880         }
5881
5882         ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
5883         if (ret < 0)
5884                 return ret;
5885
5886         ret = typec_find_port_power_role(cap_str);
5887         if (ret < 0)
5888                 return ret;
5889         port->typec_caps.type = ret;
5890         port->port_type = port->typec_caps.type;
5891
5892         port->slow_charger_loop = fwnode_property_read_bool(fwnode, "slow-charger-loop");
5893         if (port->port_type == TYPEC_PORT_SNK)
5894                 goto sink;
5895
5896         /* Get source pdos */
5897         ret = fwnode_property_count_u32(fwnode, "source-pdos");
5898         if (ret <= 0)
5899                 return -EINVAL;
5900
5901         port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
5902         ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
5903                                              port->src_pdo, port->nr_src_pdo);
5904         if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
5905                                             port->nr_src_pdo))
5906                 return -EINVAL;
5907
5908         if (port->port_type == TYPEC_PORT_SRC)
5909                 return 0;
5910
5911         /* Get the preferred power role for DRP */
5912         ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
5913         if (ret < 0)
5914                 return ret;
5915
5916         port->typec_caps.prefer_role = typec_find_power_role(cap_str);
5917         if (port->typec_caps.prefer_role < 0)
5918                 return -EINVAL;
5919 sink:
5920         /* Get sink pdos */
5921         ret = fwnode_property_count_u32(fwnode, "sink-pdos");
5922         if (ret <= 0)
5923                 return -EINVAL;
5924
5925         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
5926         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
5927                                              port->snk_pdo, port->nr_snk_pdo);
5928         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
5929                                             port->nr_snk_pdo))
5930                 return -EINVAL;
5931
5932         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
5933                 return -EINVAL;
5934         port->operating_snk_mw = mw / 1000;
5935
5936         port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
5937
5938         /* FRS can only be supported byb DRP ports */
5939         if (port->port_type == TYPEC_PORT_DRP) {
5940                 ret = fwnode_property_read_u32(fwnode, "new-source-frs-typec-current",
5941                                                &frs_current);
5942                 if (ret >= 0 && frs_current <= FRS_5V_3A)
5943                         port->new_source_frs_current = frs_current;
5944         }
5945
5946         /* sink-vdos is optional */
5947         ret = fwnode_property_count_u32(fwnode, "sink-vdos");
5948         if (ret < 0)
5949                 ret = 0;
5950
5951         port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
5952         if (port->nr_snk_vdo) {
5953                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
5954                                                      port->snk_vdo,
5955                                                      port->nr_snk_vdo);
5956                 if (ret < 0)
5957                         return ret;
5958         }
5959
5960         /* If sink-vdos is found, sink-vdos-v1 is expected for backward compatibility. */
5961         if (port->nr_snk_vdo) {
5962                 ret = fwnode_property_count_u32(fwnode, "sink-vdos-v1");
5963                 if (ret < 0)
5964                         return ret;
5965                 else if (ret == 0)
5966                         return -ENODATA;
5967
5968                 port->nr_snk_vdo_v1 = min(ret, VDO_MAX_OBJECTS);
5969                 ret = fwnode_property_read_u32_array(fwnode, "sink-vdos-v1",
5970                                                      port->snk_vdo_v1,
5971                                                      port->nr_snk_vdo_v1);
5972                 if (ret < 0)
5973                         return ret;
5974         }
5975
5976         return 0;
5977 }
5978
5979 /* Power Supply access to expose source power information */
5980 enum tcpm_psy_online_states {
5981         TCPM_PSY_OFFLINE = 0,
5982         TCPM_PSY_FIXED_ONLINE,
5983         TCPM_PSY_PROG_ONLINE,
5984 };
5985
5986 static enum power_supply_property tcpm_psy_props[] = {
5987         POWER_SUPPLY_PROP_USB_TYPE,
5988         POWER_SUPPLY_PROP_ONLINE,
5989         POWER_SUPPLY_PROP_VOLTAGE_MIN,
5990         POWER_SUPPLY_PROP_VOLTAGE_MAX,
5991         POWER_SUPPLY_PROP_VOLTAGE_NOW,
5992         POWER_SUPPLY_PROP_CURRENT_MAX,
5993         POWER_SUPPLY_PROP_CURRENT_NOW,
5994 };
5995
5996 static int tcpm_psy_get_online(struct tcpm_port *port,
5997                                union power_supply_propval *val)
5998 {
5999         if (port->vbus_charge) {
6000                 if (port->pps_data.active)
6001                         val->intval = TCPM_PSY_PROG_ONLINE;
6002                 else
6003                         val->intval = TCPM_PSY_FIXED_ONLINE;
6004         } else {
6005                 val->intval = TCPM_PSY_OFFLINE;
6006         }
6007
6008         return 0;
6009 }
6010
6011 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
6012                                     union power_supply_propval *val)
6013 {
6014         if (port->pps_data.active)
6015                 val->intval = port->pps_data.min_volt * 1000;
6016         else
6017                 val->intval = port->supply_voltage * 1000;
6018
6019         return 0;
6020 }
6021
6022 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
6023                                     union power_supply_propval *val)
6024 {
6025         if (port->pps_data.active)
6026                 val->intval = port->pps_data.max_volt * 1000;
6027         else
6028                 val->intval = port->supply_voltage * 1000;
6029
6030         return 0;
6031 }
6032
6033 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
6034                                     union power_supply_propval *val)
6035 {
6036         val->intval = port->supply_voltage * 1000;
6037
6038         return 0;
6039 }
6040
6041 static int tcpm_psy_get_current_max(struct tcpm_port *port,
6042                                     union power_supply_propval *val)
6043 {
6044         if (port->pps_data.active)
6045                 val->intval = port->pps_data.max_curr * 1000;
6046         else
6047                 val->intval = port->current_limit * 1000;
6048
6049         return 0;
6050 }
6051
6052 static int tcpm_psy_get_current_now(struct tcpm_port *port,
6053                                     union power_supply_propval *val)
6054 {
6055         val->intval = port->current_limit * 1000;
6056
6057         return 0;
6058 }
6059
6060 static int tcpm_psy_get_prop(struct power_supply *psy,
6061                              enum power_supply_property psp,
6062                              union power_supply_propval *val)
6063 {
6064         struct tcpm_port *port = power_supply_get_drvdata(psy);
6065         int ret = 0;
6066
6067         switch (psp) {
6068         case POWER_SUPPLY_PROP_USB_TYPE:
6069                 val->intval = port->usb_type;
6070                 break;
6071         case POWER_SUPPLY_PROP_ONLINE:
6072                 ret = tcpm_psy_get_online(port, val);
6073                 break;
6074         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
6075                 ret = tcpm_psy_get_voltage_min(port, val);
6076                 break;
6077         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
6078                 ret = tcpm_psy_get_voltage_max(port, val);
6079                 break;
6080         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6081                 ret = tcpm_psy_get_voltage_now(port, val);
6082                 break;
6083         case POWER_SUPPLY_PROP_CURRENT_MAX:
6084                 ret = tcpm_psy_get_current_max(port, val);
6085                 break;
6086         case POWER_SUPPLY_PROP_CURRENT_NOW:
6087                 ret = tcpm_psy_get_current_now(port, val);
6088                 break;
6089         default:
6090                 ret = -EINVAL;
6091                 break;
6092         }
6093
6094         return ret;
6095 }
6096
6097 static int tcpm_psy_set_online(struct tcpm_port *port,
6098                                const union power_supply_propval *val)
6099 {
6100         int ret;
6101
6102         switch (val->intval) {
6103         case TCPM_PSY_FIXED_ONLINE:
6104                 ret = tcpm_pps_activate(port, false);
6105                 break;
6106         case TCPM_PSY_PROG_ONLINE:
6107                 ret = tcpm_pps_activate(port, true);
6108                 break;
6109         default:
6110                 ret = -EINVAL;
6111                 break;
6112         }
6113
6114         return ret;
6115 }
6116
6117 static int tcpm_psy_set_prop(struct power_supply *psy,
6118                              enum power_supply_property psp,
6119                              const union power_supply_propval *val)
6120 {
6121         struct tcpm_port *port = power_supply_get_drvdata(psy);
6122         int ret;
6123
6124         switch (psp) {
6125         case POWER_SUPPLY_PROP_ONLINE:
6126                 ret = tcpm_psy_set_online(port, val);
6127                 break;
6128         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6129                 if (val->intval < port->pps_data.min_volt * 1000 ||
6130                     val->intval > port->pps_data.max_volt * 1000)
6131                         ret = -EINVAL;
6132                 else
6133                         ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
6134                 break;
6135         case POWER_SUPPLY_PROP_CURRENT_NOW:
6136                 if (val->intval > port->pps_data.max_curr * 1000)
6137                         ret = -EINVAL;
6138                 else
6139                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
6140                 break;
6141         default:
6142                 ret = -EINVAL;
6143                 break;
6144         }
6145         power_supply_changed(port->psy);
6146         return ret;
6147 }
6148
6149 static int tcpm_psy_prop_writeable(struct power_supply *psy,
6150                                    enum power_supply_property psp)
6151 {
6152         switch (psp) {
6153         case POWER_SUPPLY_PROP_ONLINE:
6154         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
6155         case POWER_SUPPLY_PROP_CURRENT_NOW:
6156                 return 1;
6157         default:
6158                 return 0;
6159         }
6160 }
6161
6162 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
6163         POWER_SUPPLY_USB_TYPE_C,
6164         POWER_SUPPLY_USB_TYPE_PD,
6165         POWER_SUPPLY_USB_TYPE_PD_PPS,
6166 };
6167
6168 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
6169
6170 static int devm_tcpm_psy_register(struct tcpm_port *port)
6171 {
6172         struct power_supply_config psy_cfg = {};
6173         const char *port_dev_name = dev_name(port->dev);
6174         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
6175                                      strlen(port_dev_name) + 1;
6176         char *psy_name;
6177
6178         psy_cfg.drv_data = port;
6179         psy_cfg.fwnode = dev_fwnode(port->dev);
6180         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
6181         if (!psy_name)
6182                 return -ENOMEM;
6183
6184         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
6185                  port_dev_name);
6186         port->psy_desc.name = psy_name;
6187         port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
6188         port->psy_desc.usb_types = tcpm_psy_usb_types;
6189         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
6190         port->psy_desc.properties = tcpm_psy_props;
6191         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props);
6192         port->psy_desc.get_property = tcpm_psy_get_prop;
6193         port->psy_desc.set_property = tcpm_psy_set_prop;
6194         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable;
6195
6196         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
6197
6198         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
6199                                                &psy_cfg);
6200
6201         return PTR_ERR_OR_ZERO(port->psy);
6202 }
6203
6204 static enum hrtimer_restart state_machine_timer_handler(struct hrtimer *timer)
6205 {
6206         struct tcpm_port *port = container_of(timer, struct tcpm_port, state_machine_timer);
6207
6208         kthread_queue_work(port->wq, &port->state_machine);
6209         return HRTIMER_NORESTART;
6210 }
6211
6212 static enum hrtimer_restart vdm_state_machine_timer_handler(struct hrtimer *timer)
6213 {
6214         struct tcpm_port *port = container_of(timer, struct tcpm_port, vdm_state_machine_timer);
6215
6216         kthread_queue_work(port->wq, &port->vdm_state_machine);
6217         return HRTIMER_NORESTART;
6218 }
6219
6220 static enum hrtimer_restart enable_frs_timer_handler(struct hrtimer *timer)
6221 {
6222         struct tcpm_port *port = container_of(timer, struct tcpm_port, enable_frs_timer);
6223
6224         kthread_queue_work(port->wq, &port->enable_frs);
6225         return HRTIMER_NORESTART;
6226 }
6227
6228 static enum hrtimer_restart send_discover_timer_handler(struct hrtimer *timer)
6229 {
6230         struct tcpm_port *port = container_of(timer, struct tcpm_port, send_discover_timer);
6231
6232         kthread_queue_work(port->wq, &port->send_discover_work);
6233         return HRTIMER_NORESTART;
6234 }
6235
6236 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
6237 {
6238         struct tcpm_port *port;
6239         int err;
6240
6241         if (!dev || !tcpc ||
6242             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
6243             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
6244             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
6245                 return ERR_PTR(-EINVAL);
6246
6247         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
6248         if (!port)
6249                 return ERR_PTR(-ENOMEM);
6250
6251         port->dev = dev;
6252         port->tcpc = tcpc;
6253
6254         mutex_init(&port->lock);
6255         mutex_init(&port->swap_lock);
6256
6257         port->wq = kthread_create_worker(0, dev_name(dev));
6258         if (IS_ERR(port->wq))
6259                 return ERR_CAST(port->wq);
6260         sched_set_fifo(port->wq->task);
6261
6262         kthread_init_work(&port->state_machine, tcpm_state_machine_work);
6263         kthread_init_work(&port->vdm_state_machine, vdm_state_machine_work);
6264         kthread_init_work(&port->event_work, tcpm_pd_event_handler);
6265         kthread_init_work(&port->enable_frs, tcpm_enable_frs_work);
6266         kthread_init_work(&port->send_discover_work, tcpm_send_discover_work);
6267         hrtimer_init(&port->state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6268         port->state_machine_timer.function = state_machine_timer_handler;
6269         hrtimer_init(&port->vdm_state_machine_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6270         port->vdm_state_machine_timer.function = vdm_state_machine_timer_handler;
6271         hrtimer_init(&port->enable_frs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6272         port->enable_frs_timer.function = enable_frs_timer_handler;
6273         hrtimer_init(&port->send_discover_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
6274         port->send_discover_timer.function = send_discover_timer_handler;
6275
6276         spin_lock_init(&port->pd_event_lock);
6277
6278         init_completion(&port->tx_complete);
6279         init_completion(&port->swap_complete);
6280         init_completion(&port->pps_complete);
6281         tcpm_debugfs_init(port);
6282
6283         err = tcpm_fw_get_caps(port, tcpc->fwnode);
6284         if (err < 0)
6285                 goto out_destroy_wq;
6286
6287         port->try_role = port->typec_caps.prefer_role;
6288
6289         port->typec_caps.fwnode = tcpc->fwnode;
6290         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
6291         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
6292         port->typec_caps.svdm_version = SVDM_VER_2_0;
6293         port->typec_caps.driver_data = port;
6294         port->typec_caps.ops = &tcpm_ops;
6295         port->typec_caps.orientation_aware = 1;
6296
6297         port->partner_desc.identity = &port->partner_ident;
6298         port->port_type = port->typec_caps.type;
6299
6300         port->role_sw = usb_role_switch_get(port->dev);
6301         if (IS_ERR(port->role_sw)) {
6302                 err = PTR_ERR(port->role_sw);
6303                 goto out_destroy_wq;
6304         }
6305
6306         err = devm_tcpm_psy_register(port);
6307         if (err)
6308                 goto out_role_sw_put;
6309         power_supply_changed(port->psy);
6310
6311         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
6312         if (IS_ERR(port->typec_port)) {
6313                 err = PTR_ERR(port->typec_port);
6314                 goto out_role_sw_put;
6315         }
6316
6317         typec_port_register_altmodes(port->typec_port,
6318                                      &tcpm_altmode_ops, port,
6319                                      port->port_altmode, ALTMODE_DISCOVERY_MAX);
6320
6321         mutex_lock(&port->lock);
6322         tcpm_init(port);
6323         mutex_unlock(&port->lock);
6324
6325         tcpm_log(port, "%s: registered", dev_name(dev));
6326         return port;
6327
6328 out_role_sw_put:
6329         usb_role_switch_put(port->role_sw);
6330 out_destroy_wq:
6331         tcpm_debugfs_exit(port);
6332         kthread_destroy_worker(port->wq);
6333         return ERR_PTR(err);
6334 }
6335 EXPORT_SYMBOL_GPL(tcpm_register_port);
6336
6337 void tcpm_unregister_port(struct tcpm_port *port)
6338 {
6339         int i;
6340
6341         hrtimer_cancel(&port->send_discover_timer);
6342         hrtimer_cancel(&port->enable_frs_timer);
6343         hrtimer_cancel(&port->vdm_state_machine_timer);
6344         hrtimer_cancel(&port->state_machine_timer);
6345
6346         tcpm_reset_port(port);
6347         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
6348                 typec_unregister_altmode(port->port_altmode[i]);
6349         typec_unregister_port(port->typec_port);
6350         usb_role_switch_put(port->role_sw);
6351         tcpm_debugfs_exit(port);
6352         kthread_destroy_worker(port->wq);
6353 }
6354 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
6355
6356 MODULE_AUTHOR("Guenter Roeck <[email protected]>");
6357 MODULE_DESCRIPTION("USB Type-C Port Manager");
6358 MODULE_LICENSE("GPL");