drivers/usb/typec/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/jiffies.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/mutex.h>
  15 #include <linux/power_supply.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/property.h>
  18 #include <linux/sched/clock.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/slab.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/usb/pd.h>
  23 #include <linux/usb/pd_ado.h>
  24 #include <linux/usb/pd_bdo.h>
  25 #include <linux/usb/pd_ext_sdb.h>
  26 #include <linux/usb/pd_vdo.h>
  27 #include <linux/usb/role.h>
  28 #include <linux/usb/tcpm.h>
  29 #include <linux/usb/typec_altmode.h>
  30 #include <linux/workqueue.h>
  31
  32 #define FOREACH_STATE(S)                        \
  33         S(INVALID_STATE),                       \
  34         S(DRP_TOGGLING),                        \
  35         S(SRC_UNATTACHED),                      \
  36         S(SRC_ATTACH_WAIT),                     \
  37         S(SRC_ATTACHED),                        \
  38         S(SRC_STARTUP),                         \
  39         S(SRC_SEND_CAPABILITIES),               \
  40         S(SRC_NEGOTIATE_CAPABILITIES),          \
  41         S(SRC_TRANSITION_SUPPLY),               \
  42         S(SRC_READY),                           \
  43         S(SRC_WAIT_NEW_CAPABILITIES),           \
  44                                                 \
  45         S(SNK_UNATTACHED),                      \
  46         S(SNK_ATTACH_WAIT),                     \
  47         S(SNK_DEBOUNCED),                       \
  48         S(SNK_ATTACHED),                        \
  49         S(SNK_STARTUP),                         \
  50         S(SNK_DISCOVERY),                       \
  51         S(SNK_DISCOVERY_DEBOUNCE),              \
  52         S(SNK_DISCOVERY_DEBOUNCE_DONE),         \
  53         S(SNK_WAIT_CAPABILITIES),               \
  54         S(SNK_NEGOTIATE_CAPABILITIES),          \
  55         S(SNK_NEGOTIATE_PPS_CAPABILITIES),      \
  56         S(SNK_TRANSITION_SINK),                 \
  57         S(SNK_TRANSITION_SINK_VBUS),            \
  58         S(SNK_READY),                           \
  59                                                 \
  60         S(ACC_UNATTACHED),                      \
  61         S(DEBUG_ACC_ATTACHED),                  \
  62         S(AUDIO_ACC_ATTACHED),                  \
  63         S(AUDIO_ACC_DEBOUNCE),                  \
  64                                                 \
  65         S(HARD_RESET_SEND),                     \
  66         S(HARD_RESET_START),                    \
  67         S(SRC_HARD_RESET_VBUS_OFF),             \
  68         S(SRC_HARD_RESET_VBUS_ON),              \
  69         S(SNK_HARD_RESET_SINK_OFF),             \
  70         S(SNK_HARD_RESET_WAIT_VBUS),            \
  71         S(SNK_HARD_RESET_SINK_ON),              \
  72                                                 \
  73         S(SOFT_RESET),                          \
  74         S(SOFT_RESET_SEND),                     \
  75                                                 \
  76         S(DR_SWAP_ACCEPT),                      \
  77         S(DR_SWAP_SEND),                        \
  78         S(DR_SWAP_SEND_TIMEOUT),                \
  79         S(DR_SWAP_CANCEL),                      \
  80         S(DR_SWAP_CHANGE_DR),                   \
  81                                                 \
  82         S(PR_SWAP_ACCEPT),                      \
  83         S(PR_SWAP_SEND),                        \
  84         S(PR_SWAP_SEND_TIMEOUT),                \
  85         S(PR_SWAP_CANCEL),                      \
  86         S(PR_SWAP_START),                       \
  87         S(PR_SWAP_SRC_SNK_TRANSITION_OFF),      \
  88         S(PR_SWAP_SRC_SNK_SOURCE_OFF),          \
  89         S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
  90         S(PR_SWAP_SRC_SNK_SINK_ON),             \
  91         S(PR_SWAP_SNK_SRC_SINK_OFF),            \
  92         S(PR_SWAP_SNK_SRC_SOURCE_ON),           \
  93         S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP),    \
  94                                                 \
  95         S(VCONN_SWAP_ACCEPT),                   \
  96         S(VCONN_SWAP_SEND),                     \
  97         S(VCONN_SWAP_SEND_TIMEOUT),             \
  98         S(VCONN_SWAP_CANCEL),                   \
  99         S(VCONN_SWAP_START),                    \
 100         S(VCONN_SWAP_WAIT_FOR_VCONN),           \
 101         S(VCONN_SWAP_TURN_ON_VCONN),            \
 102         S(VCONN_SWAP_TURN_OFF_VCONN),           \
 103                                                 \
 104         S(SNK_TRY),                             \
 105         S(SNK_TRY_WAIT),                        \
 106         S(SNK_TRY_WAIT_DEBOUNCE),               \
 107         S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS),    \
 108         S(SRC_TRYWAIT),                         \
 109         S(SRC_TRYWAIT_DEBOUNCE),                \
 110         S(SRC_TRYWAIT_UNATTACHED),              \
 111                                                 \
 112         S(SRC_TRY),                             \
 113         S(SRC_TRY_WAIT),                        \
 114         S(SRC_TRY_DEBOUNCE),                    \
 115         S(SNK_TRYWAIT),                         \
 116         S(SNK_TRYWAIT_DEBOUNCE),                \
 117         S(SNK_TRYWAIT_VBUS),                    \
 118         S(BIST_RX),                             \
 119                                                 \
 120         S(GET_STATUS_SEND),                     \
 121         S(GET_STATUS_SEND_TIMEOUT),             \
 122         S(GET_PPS_STATUS_SEND),                 \
 123         S(GET_PPS_STATUS_SEND_TIMEOUT),         \
 124                                                 \
 125         S(ERROR_RECOVERY),                      \
 126         S(PORT_RESET),                          \
 127         S(PORT_RESET_WAIT_OFF)
 128
 129 #define GENERATE_ENUM(e)        e
 130 #define GENERATE_STRING(s)      #s
 131
 132 enum tcpm_state {
 133         FOREACH_STATE(GENERATE_ENUM)
 134 };
 135
 136 static const char * const tcpm_states[] = {
 137         FOREACH_STATE(GENERATE_STRING)
 138 };
 139
 140 enum vdm_states {
 141         VDM_STATE_ERR_BUSY = -3,
 142         VDM_STATE_ERR_SEND = -2,
 143         VDM_STATE_ERR_TMOUT = -1,
 144         VDM_STATE_DONE = 0,
 145         /* Anything >0 represents an active state */
 146         VDM_STATE_READY = 1,
 147         VDM_STATE_BUSY = 2,
 148         VDM_STATE_WAIT_RSP_BUSY = 3,
 149 };
 150
 151 enum pd_msg_request {
 152         PD_MSG_NONE = 0,
 153         PD_MSG_CTRL_REJECT,
 154         PD_MSG_CTRL_WAIT,
 155         PD_MSG_CTRL_NOT_SUPP,
 156         PD_MSG_DATA_SINK_CAP,
 157         PD_MSG_DATA_SOURCE_CAP,
 158 };
 159
 160 /* Events from low level driver */
 161
 162 #define TCPM_CC_EVENT           BIT(0)
 163 #define TCPM_VBUS_EVENT         BIT(1)
 164 #define TCPM_RESET_EVENT        BIT(2)
 165
 166 #define LOG_BUFFER_ENTRIES      1024
 167 #define LOG_BUFFER_ENTRY_SIZE   128
 168
 169 /* Alternate mode support */
 170
 171 #define SVID_DISCOVERY_MAX      16
 172 #define ALTMODE_DISCOVERY_MAX   (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
 173
 174 struct pd_mode_data {
 175         int svid_index;         /* current SVID index           */
 176         int nsvids;
 177         u16 svids[SVID_DISCOVERY_MAX];
 178         int altmodes;           /* number of alternate modes    */
 179         struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
 180 };
 181
 182 struct pd_pps_data {
 183         u32 min_volt;
 184         u32 max_volt;
 185         u32 max_curr;
 186         u32 out_volt;
 187         u32 op_curr;
 188         bool supported;
 189         bool active;
 190 };
 191
 192 struct tcpm_port {
 193         struct device *dev;
 194
 195         struct mutex lock;              /* tcpm state machine lock */
 196         struct workqueue_struct *wq;
 197
 198         struct typec_capability typec_caps;
 199         struct typec_port *typec_port;
 200
 201         struct tcpc_dev *tcpc;
 202         struct usb_role_switch *role_sw;
 203
 204         enum typec_role vconn_role;
 205         enum typec_role pwr_role;
 206         enum typec_data_role data_role;
 207         enum typec_pwr_opmode pwr_opmode;
 208
 209         struct usb_pd_identity partner_ident;
 210         struct typec_partner_desc partner_desc;
 211         struct typec_partner *partner;
 212
 213         enum typec_cc_status cc_req;
 214
 215         enum typec_cc_status cc1;
 216         enum typec_cc_status cc2;
 217         enum typec_cc_polarity polarity;
 218
 219         bool attached;
 220         bool connected;
 221         enum typec_port_type port_type;
 222         bool vbus_present;
 223         bool vbus_never_low;
 224         bool vbus_source;
 225         bool vbus_charge;
 226
 227         bool send_discover;
 228         bool op_vsafe5v;
 229
 230         int try_role;
 231         int try_snk_count;
 232         int try_src_count;
 233
 234         enum pd_msg_request queued_message;
 235
 236         enum tcpm_state enter_state;
 237         enum tcpm_state prev_state;
 238         enum tcpm_state state;
 239         enum tcpm_state delayed_state;
 240         unsigned long delayed_runtime;
 241         unsigned long delay_ms;
 242
 243         spinlock_t pd_event_lock;
 244         u32 pd_events;
 245
 246         struct work_struct event_work;
 247         struct delayed_work state_machine;
 248         struct delayed_work vdm_state_machine;
 249         bool state_machine_running;
 250
 251         struct completion tx_complete;
 252         enum tcpm_transmit_status tx_status;
 253
 254         struct mutex swap_lock;         /* swap command lock */
 255         bool swap_pending;
 256         bool non_pd_role_swap;
 257         struct completion swap_complete;
 258         int swap_status;
 259
 260         unsigned int negotiated_rev;
 261         unsigned int message_id;
 262         unsigned int caps_count;
 263         unsigned int hard_reset_count;
 264         bool pd_capable;
 265         bool explicit_contract;
 266         unsigned int rx_msgid;
 267
 268         /* Partner capabilities/requests */
 269         u32 sink_request;
 270         u32 source_caps[PDO_MAX_OBJECTS];
 271         unsigned int nr_source_caps;
 272         u32 sink_caps[PDO_MAX_OBJECTS];
 273         unsigned int nr_sink_caps;
 274
 275         /* Local capabilities */
 276         u32 src_pdo[PDO_MAX_OBJECTS];
 277         unsigned int nr_src_pdo;
 278         u32 snk_pdo[PDO_MAX_OBJECTS];
 279         unsigned int nr_snk_pdo;
 280         u32 snk_vdo[VDO_MAX_OBJECTS];
 281         unsigned int nr_snk_vdo;
 282
 283         unsigned int operating_snk_mw;
 284         bool update_sink_caps;
 285
 286         /* Requested current / voltage */
 287         u32 current_limit;
 288         u32 supply_voltage;
 289
 290         /* Used to export TA voltage and current */
 291         struct power_supply *psy;
 292         struct power_supply_desc psy_desc;
 293         enum power_supply_usb_type usb_type;
 294
 295         u32 bist_request;
 296
 297         /* PD state for Vendor Defined Messages */
 298         enum vdm_states vdm_state;
 299         u32 vdm_retries;
 300         /* next Vendor Defined Message to send */
 301         u32 vdo_data[VDO_MAX_SIZE];
 302         u8 vdo_count;
 303         /* VDO to retry if UFP responder replied busy */
 304         u32 vdo_retry;
 305
 306         /* PPS */
 307         struct pd_pps_data pps_data;
 308         struct completion pps_complete;
 309         bool pps_pending;
 310         int pps_status;
 311
 312         /* Alternate mode data */
 313         struct pd_mode_data mode_data;
 314         struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
 315         struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
 316
 317         /* Deadline in jiffies to exit src_try_wait state */
 318         unsigned long max_wait;
 319
 320 #ifdef CONFIG_DEBUG_FS
 321         struct dentry *dentry;
 322         struct mutex logbuffer_lock;    /* log buffer access lock */
 323         int logbuffer_head;
 324         int logbuffer_tail;
 325         u8 *logbuffer[LOG_BUFFER_ENTRIES];
 326 #endif
 327 };
 328
 329 struct pd_rx_event {
 330         struct work_struct work;
 331         struct tcpm_port *port;
 332         struct pd_message msg;
 333 };
 334
 335 #define tcpm_cc_is_sink(cc) \
 336         ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
 337          (cc) == TYPEC_CC_RP_3_0)
 338
 339 #define tcpm_port_is_sink(port) \
 340         ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
 341          (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
 342
 343 #define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
 344 #define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
 345 #define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
 346
 347 #define tcpm_port_is_source(port) \
 348         ((tcpm_cc_is_source((port)->cc1) && \
 349          !tcpm_cc_is_source((port)->cc2)) || \
 350          (tcpm_cc_is_source((port)->cc2) && \
 351           !tcpm_cc_is_source((port)->cc1)))
 352
 353 #define tcpm_port_is_debug(port) \
 354         (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
 355
 356 #define tcpm_port_is_audio(port) \
 357         (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
 358
 359 #define tcpm_port_is_audio_detached(port) \
 360         ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
 361          (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
 362
 363 #define tcpm_try_snk(port) \
 364         ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
 365         (port)->port_type == TYPEC_PORT_DRP)
 366
 367 #define tcpm_try_src(port) \
 368         ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
 369         (port)->port_type == TYPEC_PORT_DRP)
 370
 371 static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
 372 {
 373         if (port->port_type == TYPEC_PORT_DRP) {
 374                 if (port->try_role == TYPEC_SINK)
 375                         return SNK_UNATTACHED;
 376                 else if (port->try_role == TYPEC_SOURCE)
 377                         return SRC_UNATTACHED;
 378                 else if (port->tcpc->config->default_role == TYPEC_SINK)
 379                         return SNK_UNATTACHED;
 380                 /* Fall through to return SRC_UNATTACHED */
 381         } else if (port->port_type == TYPEC_PORT_SNK) {
 382                 return SNK_UNATTACHED;
 383         }
 384         return SRC_UNATTACHED;
 385 }
 386
 387 static inline
 388 struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
 389 {
 390         return container_of(cap, struct tcpm_port, typec_caps);
 391 }
 392
 393 static bool tcpm_port_is_disconnected(struct tcpm_port *port)
 394 {
 395         return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
 396                 port->cc2 == TYPEC_CC_OPEN) ||
 397                (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
 398                                     port->cc1 == TYPEC_CC_OPEN) ||
 399                                    (port->polarity == TYPEC_POLARITY_CC2 &&
 400                                     port->cc2 == TYPEC_CC_OPEN)));
 401 }
 402
 403 /*
 404  * Logging
 405  */
 406
 407 #ifdef CONFIG_DEBUG_FS
 408
 409 static bool tcpm_log_full(struct tcpm_port *port)
 410 {
 411         return port->logbuffer_tail ==
 412                 (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 413 }
 414
 415 __printf(2, 0)
 416 static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
 417 {
 418         char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
 419         u64 ts_nsec = local_clock();
 420         unsigned long rem_nsec;
 421
 422         mutex_lock(&port->logbuffer_lock);
 423         if (!port->logbuffer[port->logbuffer_head]) {
 424                 port->logbuffer[port->logbuffer_head] =
 425                                 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
 426                 if (!port->logbuffer[port->logbuffer_head]) {
 427                         mutex_unlock(&port->logbuffer_lock);
 428                         return;
 429                 }
 430         }
 431
 432         vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
 433
 434         if (tcpm_log_full(port)) {
 435                 port->logbuffer_head = max(port->logbuffer_head - 1, 0);
 436                 strcpy(tmpbuffer, "overflow");
 437         }
 438
 439         if (port->logbuffer_head < 0 ||
 440             port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
 441                 dev_warn(port->dev,
 442                          "Bad log buffer index %d\n", port->logbuffer_head);
 443                 goto abort;
 444         }
 445
 446         if (!port->logbuffer[port->logbuffer_head]) {
 447                 dev_warn(port->dev,
 448                          "Log buffer index %d is NULL\n", port->logbuffer_head);
 449                 goto abort;
 450         }
 451
 452         rem_nsec = do_div(ts_nsec, 1000000000);
 453         scnprintf(port->logbuffer[port->logbuffer_head],
 454                   LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
 455                   (unsigned long)ts_nsec, rem_nsec / 1000,
 456                   tmpbuffer);
 457         port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
 458
 459 abort:
 460         mutex_unlock(&port->logbuffer_lock);
 461 }
 462
 463 __printf(2, 3)
 464 static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
 465 {
 466         va_list args;
 467
 468         /* Do not log while disconnected and unattached */
 469         if (tcpm_port_is_disconnected(port) &&
 470             (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
 471              port->state == DRP_TOGGLING))
 472                 return;
 473
 474         va_start(args, fmt);
 475         _tcpm_log(port, fmt, args);
 476         va_end(args);
 477 }
 478
 479 __printf(2, 3)
 480 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
 481 {
 482         va_list args;
 483
 484         va_start(args, fmt);
 485         _tcpm_log(port, fmt, args);
 486         va_end(args);
 487 }
 488
 489 static void tcpm_log_source_caps(struct tcpm_port *port)
 490 {
 491         int i;
 492
 493         for (i = 0; i < port->nr_source_caps; i++) {
 494                 u32 pdo = port->source_caps[i];
 495                 enum pd_pdo_type type = pdo_type(pdo);
 496                 char msg[64];
 497
 498                 switch (type) {
 499                 case PDO_TYPE_FIXED:
 500                         scnprintf(msg, sizeof(msg),
 501                                   "%u mV, %u mA [%s%s%s%s%s%s]",
 502                                   pdo_fixed_voltage(pdo),
 503                                   pdo_max_current(pdo),
 504                                   (pdo & PDO_FIXED_DUAL_ROLE) ?
 505                                                         "R" : "",
 506                                   (pdo & PDO_FIXED_SUSPEND) ?
 507                                                         "S" : "",
 508                                   (pdo & PDO_FIXED_HIGHER_CAP) ?
 509                                                         "H" : "",
 510                                   (pdo & PDO_FIXED_USB_COMM) ?
 511                                                         "U" : "",
 512                                   (pdo & PDO_FIXED_DATA_SWAP) ?
 513                                                         "D" : "",
 514                                   (pdo & PDO_FIXED_EXTPOWER) ?
 515                                                         "E" : "");
 516                         break;
 517                 case PDO_TYPE_VAR:
 518                         scnprintf(msg, sizeof(msg),
 519                                   "%u-%u mV, %u mA",
 520                                   pdo_min_voltage(pdo),
 521                                   pdo_max_voltage(pdo),
 522                                   pdo_max_current(pdo));
 523                         break;
 524                 case PDO_TYPE_BATT:
 525                         scnprintf(msg, sizeof(msg),
 526                                   "%u-%u mV, %u mW",
 527                                   pdo_min_voltage(pdo),
 528                                   pdo_max_voltage(pdo),
 529                                   pdo_max_power(pdo));
 530                         break;
 531                 case PDO_TYPE_APDO:
 532                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
 533                                 scnprintf(msg, sizeof(msg),
 534                                           "%u-%u mV, %u mA",
 535                                           pdo_pps_apdo_min_voltage(pdo),
 536                                           pdo_pps_apdo_max_voltage(pdo),
 537                                           pdo_pps_apdo_max_current(pdo));
 538                         else
 539                                 strcpy(msg, "undefined APDO");
 540                         break;
 541                 default:
 542                         strcpy(msg, "undefined");
 543                         break;
 544                 }
 545                 tcpm_log(port, " PDO %d: type %d, %s",
 546                          i, type, msg);
 547         }
 548 }
 549
 550 static int tcpm_debug_show(struct seq_file *s, void *v)
 551 {
 552         struct tcpm_port *port = (struct tcpm_port *)s->private;
 553         int tail;
 554
 555         mutex_lock(&port->logbuffer_lock);
 556         tail = port->logbuffer_tail;
 557         while (tail != port->logbuffer_head) {
 558                 seq_printf(s, "%s\n", port->logbuffer[tail]);
 559                 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
 560         }
 561         if (!seq_has_overflowed(s))
 562                 port->logbuffer_tail = tail;
 563         mutex_unlock(&port->logbuffer_lock);
 564
 565         return 0;
 566 }
 567 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 568
 569 static struct dentry *rootdir;
 570
 571 static void tcpm_debugfs_init(struct tcpm_port *port)
 572 {
 573         mutex_init(&port->logbuffer_lock);
 574         /* /sys/kernel/debug/tcpm/usbcX */
 575         if (!rootdir)
 576                 rootdir = debugfs_create_dir("tcpm", NULL);
 577
 578         port->dentry = debugfs_create_file(dev_name(port->dev),
 579                                            S_IFREG | 0444, rootdir,
 580                                            port, &tcpm_debug_fops);
 581 }
 582
 583 static void tcpm_debugfs_exit(struct tcpm_port *port)
 584 {
 585         debugfs_remove(port->dentry);
 586 }
 587
 588 #else
 589
 590 __printf(2, 3)
 591 static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
 592 __printf(2, 3)
 593 static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
 594 static void tcpm_log_source_caps(struct tcpm_port *port) { }
 595 static void tcpm_debugfs_init(const struct tcpm_port *port) { }
 596 static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
 597
 598 #endif
 599
 600 static int tcpm_pd_transmit(struct tcpm_port *port,
 601                             enum tcpm_transmit_type type,
 602                             const struct pd_message *msg)
 603 {
 604         unsigned long timeout;
 605         int ret;
 606
 607         if (msg)
 608                 tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
 609         else
 610                 tcpm_log(port, "PD TX, type: %#x", type);
 611
 612         reinit_completion(&port->tx_complete);
 613         ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
 614         if (ret < 0)
 615                 return ret;
 616
 617         mutex_unlock(&port->lock);
 618         timeout = wait_for_completion_timeout(&port->tx_complete,
 619                                 msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
 620         mutex_lock(&port->lock);
 621         if (!timeout)
 622                 return -ETIMEDOUT;
 623
 624         switch (port->tx_status) {
 625         case TCPC_TX_SUCCESS:
 626                 port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
 627                 return 0;
 628         case TCPC_TX_DISCARDED:
 629                 return -EAGAIN;
 630         case TCPC_TX_FAILED:
 631         default:
 632                 return -EIO;
 633         }
 634 }
 635
 636 void tcpm_pd_transmit_complete(struct tcpm_port *port,
 637                                enum tcpm_transmit_status status)
 638 {
 639         tcpm_log(port, "PD TX complete, status: %u", status);
 640         port->tx_status = status;
 641         complete(&port->tx_complete);
 642 }
 643 EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
 644
 645 static int tcpm_mux_set(struct tcpm_port *port, int state,
 646                         enum usb_role usb_role,
 647                         enum typec_orientation orientation)
 648 {
 649         int ret;
 650
 651         tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
 652                  state, usb_role, orientation);
 653
 654         ret = typec_set_orientation(port->typec_port, orientation);
 655         if (ret)
 656                 return ret;
 657
 658         if (port->role_sw) {
 659                 ret = usb_role_switch_set_role(port->role_sw, usb_role);
 660                 if (ret)
 661                         return ret;
 662         }
 663
 664         return typec_set_mode(port->typec_port, state);
 665 }
 666
 667 static int tcpm_set_polarity(struct tcpm_port *port,
 668                              enum typec_cc_polarity polarity)
 669 {
 670         int ret;
 671
 672         tcpm_log(port, "polarity %d", polarity);
 673
 674         ret = port->tcpc->set_polarity(port->tcpc, polarity);
 675         if (ret < 0)
 676                 return ret;
 677
 678         port->polarity = polarity;
 679
 680         return 0;
 681 }
 682
 683 static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
 684 {
 685         int ret;
 686
 687         tcpm_log(port, "vconn:=%d", enable);
 688
 689         ret = port->tcpc->set_vconn(port->tcpc, enable);
 690         if (!ret) {
 691                 port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
 692                 typec_set_vconn_role(port->typec_port, port->vconn_role);
 693         }
 694
 695         return ret;
 696 }
 697
 698 static u32 tcpm_get_current_limit(struct tcpm_port *port)
 699 {
 700         enum typec_cc_status cc;
 701         u32 limit;
 702
 703         cc = port->polarity ? port->cc2 : port->cc1;
 704         switch (cc) {
 705         case TYPEC_CC_RP_1_5:
 706                 limit = 1500;
 707                 break;
 708         case TYPEC_CC_RP_3_0:
 709                 limit = 3000;
 710                 break;
 711         case TYPEC_CC_RP_DEF:
 712         default:
 713                 if (port->tcpc->get_current_limit)
 714                         limit = port->tcpc->get_current_limit(port->tcpc);
 715                 else
 716                         limit = 0;
 717                 break;
 718         }
 719
 720         return limit;
 721 }
 722
 723 static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
 724 {
 725         int ret = -EOPNOTSUPP;
 726
 727         tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
 728
 729         port->supply_voltage = mv;
 730         port->current_limit = max_ma;
 731
 732         if (port->tcpc->set_current_limit)
 733                 ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
 734
 735         return ret;
 736 }
 737
 738 /*
 739  * Determine RP value to set based on maximum current supported
 740  * by a port if configured as source.
 741  * Returns CC value to report to link partner.
 742  */
 743 static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
 744 {
 745         const u32 *src_pdo = port->src_pdo;
 746         int nr_pdo = port->nr_src_pdo;
 747         int i;
 748
 749         /*
 750          * Search for first entry with matching voltage.
 751          * It should report the maximum supported current.
 752          */
 753         for (i = 0; i < nr_pdo; i++) {
 754                 const u32 pdo = src_pdo[i];
 755
 756                 if (pdo_type(pdo) == PDO_TYPE_FIXED &&
 757                     pdo_fixed_voltage(pdo) == 5000) {
 758                         unsigned int curr = pdo_max_current(pdo);
 759
 760                         if (curr >= 3000)
 761                                 return TYPEC_CC_RP_3_0;
 762                         else if (curr >= 1500)
 763                                 return TYPEC_CC_RP_1_5;
 764                         return TYPEC_CC_RP_DEF;
 765                 }
 766         }
 767
 768         return TYPEC_CC_RP_DEF;
 769 }
 770
 771 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
 772 {
 773         return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
 774                                      port->data_role);
 775 }
 776
 777 static int tcpm_set_roles(struct tcpm_port *port, bool attached,
 778                           enum typec_role role, enum typec_data_role data)
 779 {
 780         enum typec_orientation orientation;
 781         enum usb_role usb_role;
 782         int ret;
 783
 784         if (port->polarity == TYPEC_POLARITY_CC1)
 785                 orientation = TYPEC_ORIENTATION_NORMAL;
 786         else
 787                 orientation = TYPEC_ORIENTATION_REVERSE;
 788
 789         if (data == TYPEC_HOST)
 790                 usb_role = USB_ROLE_HOST;
 791         else
 792                 usb_role = USB_ROLE_DEVICE;
 793
 794         ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
 795         if (ret < 0)
 796                 return ret;
 797
 798         ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
 799         if (ret < 0)
 800                 return ret;
 801
 802         port->pwr_role = role;
 803         port->data_role = data;
 804         typec_set_data_role(port->typec_port, data);
 805         typec_set_pwr_role(port->typec_port, role);
 806
 807         return 0;
 808 }
 809
 810 static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
 811 {
 812         int ret;
 813
 814         ret = port->tcpc->set_roles(port->tcpc, true, role,
 815                                     port->data_role);
 816         if (ret < 0)
 817                 return ret;
 818
 819         port->pwr_role = role;
 820         typec_set_pwr_role(port->typec_port, role);
 821
 822         return 0;
 823 }
 824
 825 static int tcpm_pd_send_source_caps(struct tcpm_port *port)
 826 {
 827         struct pd_message msg;
 828         int i;
 829
 830         memset(&msg, 0, sizeof(msg));
 831         if (!port->nr_src_pdo) {
 832                 /* No source capabilities defined, sink only */
 833                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
 834                                           port->pwr_role,
 835                                           port->data_role,
 836                                           port->negotiated_rev,
 837                                           port->message_id, 0);
 838         } else {
 839                 msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
 840                                           port->pwr_role,
 841                                           port->data_role,
 842                                           port->negotiated_rev,
 843                                           port->message_id,
 844                                           port->nr_src_pdo);
 845         }
 846         for (i = 0; i < port->nr_src_pdo; i++)
 847                 msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
 848
 849         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
 850 }
 851
 852 static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
 853 {
 854         struct pd_message msg;
 855         int i;
 856
 857         memset(&msg, 0, sizeof(msg));
 858         if (!port->nr_snk_pdo) {
 859                 /* No sink capabilities defined, source only */
 860                 msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
 861                                           port->pwr_role,
 862                                           port->data_role,
 863                                           port->negotiated_rev,
 864                                           port->message_id, 0);
 865         } else {
 866                 msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
 867                                           port->pwr_role,
 868                                           port->data_role,
 869                                           port->negotiated_rev,
 870                                           port->message_id,
 871                                           port->nr_snk_pdo);
 872         }
 873         for (i = 0; i < port->nr_snk_pdo; i++)
 874                 msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
 875
 876         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
 877 }
 878
 879 static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
 880                            unsigned int delay_ms)
 881 {
 882         if (delay_ms) {
 883                 tcpm_log(port, "pending state change %s -> %s @ %u ms",
 884                          tcpm_states[port->state], tcpm_states[state],
 885                          delay_ms);
 886                 port->delayed_state = state;
 887                 mod_delayed_work(port->wq, &port->state_machine,
 888                                  msecs_to_jiffies(delay_ms));
 889                 port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
 890                 port->delay_ms = delay_ms;
 891         } else {
 892                 tcpm_log(port, "state change %s -> %s",
 893                          tcpm_states[port->state], tcpm_states[state]);
 894                 port->delayed_state = INVALID_STATE;
 895                 port->prev_state = port->state;
 896                 port->state = state;
 897                 /*
 898                  * Don't re-queue the state machine work item if we're currently
 899                  * in the state machine and we're immediately changing states.
 900                  * tcpm_state_machine_work() will continue running the state
 901                  * machine.
 902                  */
 903                 if (!port->state_machine_running)
 904                         mod_delayed_work(port->wq, &port->state_machine, 0);
 905         }
 906 }
 907
 908 static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
 909                                 unsigned int delay_ms)
 910 {
 911         if (port->enter_state == port->state)
 912                 tcpm_set_state(port, state, delay_ms);
 913         else
 914                 tcpm_log(port,
 915                          "skipped %sstate change %s -> %s [%u ms], context state %s",
 916                          delay_ms ? "delayed " : "",
 917                          tcpm_states[port->state], tcpm_states[state],
 918                          delay_ms, tcpm_states[port->enter_state]);
 919 }
 920
 921 static void tcpm_queue_message(struct tcpm_port *port,
 922                                enum pd_msg_request message)
 923 {
 924         port->queued_message = message;
 925         mod_delayed_work(port->wq, &port->state_machine, 0);
 926 }
 927
 928 /*
 929  * VDM/VDO handling functions
 930  */
 931 static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
 932                            const u32 *data, int cnt)
 933 {
 934         port->vdo_count = cnt + 1;
 935         port->vdo_data[0] = header;
 936         memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
 937         /* Set ready, vdm state machine will actually send */
 938         port->vdm_retries = 0;
 939         port->vdm_state = VDM_STATE_READY;
 940 }
 941
 942 static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
 943                                   int cnt)
 944 {
 945         u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
 946         u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
 947
 948         memset(&port->mode_data, 0, sizeof(port->mode_data));
 949
 950         port->partner_ident.id_header = vdo;
 951         port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
 952         port->partner_ident.product = product;
 953
 954         typec_partner_set_identity(port->partner);
 955
 956         tcpm_log(port, "Identity: %04x:%04x.%04x",
 957                  PD_IDH_VID(vdo),
 958                  PD_PRODUCT_PID(product), product & 0xffff);
 959 }
 960
 961 static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
 962                                int cnt)
 963 {
 964         struct pd_mode_data *pmdata = &port->mode_data;
 965         int i;
 966
 967         for (i = 1; i < cnt; i++) {
 968                 u32 p = le32_to_cpu(payload[i]);
 969                 u16 svid;
 970
 971                 svid = (p >> 16) & 0xffff;
 972                 if (!svid)
 973                         return false;
 974
 975                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
 976                         goto abort;
 977
 978                 pmdata->svids[pmdata->nsvids++] = svid;
 979                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
 980
 981                 svid = p & 0xffff;
 982                 if (!svid)
 983                         return false;
 984
 985                 if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
 986                         goto abort;
 987
 988                 pmdata->svids[pmdata->nsvids++] = svid;
 989                 tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
 990         }
 991         return true;
 992 abort:
 993         tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
 994         return false;
 995 }
 996
 997 static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
 998                                int cnt)
 999 {
1000         struct pd_mode_data *pmdata = &port->mode_data;
1001         struct typec_altmode_desc *paltmode;
1002         int i;
1003
1004         if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
1005                 /* Already logged in svdm_consume_svids() */
1006                 return;
1007         }
1008
1009         for (i = 1; i < cnt; i++) {
1010                 paltmode = &pmdata->altmode_desc[pmdata->altmodes];
1011                 memset(paltmode, 0, sizeof(*paltmode));
1012
1013                 paltmode->svid = pmdata->svids[pmdata->svid_index];
1014                 paltmode->mode = i;
1015                 paltmode->vdo = le32_to_cpu(payload[i]);
1016
1017                 tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
1018                          pmdata->altmodes, paltmode->svid,
1019                          paltmode->mode, paltmode->vdo);
1020
1021                 pmdata->altmodes++;
1022         }
1023 }
1024
1025 static void tcpm_register_partner_altmodes(struct tcpm_port *port)
1026 {
1027         struct pd_mode_data *modep = &port->mode_data;
1028         struct typec_altmode *altmode;
1029         int i;
1030
1031         for (i = 0; i < modep->altmodes; i++) {
1032                 altmode = typec_partner_register_altmode(port->partner,
1033                                                 &modep->altmode_desc[i]);
1034                 if (!altmode)
1035                         tcpm_log(port, "Failed to register partner SVID 0x%04x",
1036                                  modep->altmode_desc[i].svid);
1037                 port->partner_altmode[i] = altmode;
1038         }
1039 }
1040
1041 #define supports_modal(port)    PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
1042
1043 static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
1044                         u32 *response)
1045 {
1046         struct typec_altmode *adev;
1047         struct typec_altmode *pdev;
1048         struct pd_mode_data *modep;
1049         u32 p[PD_MAX_PAYLOAD];
1050         int rlen = 0;
1051         int cmd_type;
1052         int cmd;
1053         int i;
1054
1055         for (i = 0; i < cnt; i++)
1056                 p[i] = le32_to_cpu(payload[i]);
1057
1058         cmd_type = PD_VDO_CMDT(p[0]);
1059         cmd = PD_VDO_CMD(p[0]);
1060
1061         tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
1062                  p[0], cmd_type, cmd, cnt);
1063
1064         modep = &port->mode_data;
1065
1066         adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
1067                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1068
1069         pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
1070                                    PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
1071
1072         switch (cmd_type) {
1073         case CMDT_INIT:
1074                 switch (cmd) {
1075                 case CMD_DISCOVER_IDENT:
1076                         /* 6.4.4.3.1: Only respond as UFP (device) */
1077                         if (port->data_role == TYPEC_DEVICE &&
1078                             port->nr_snk_vdo) {
1079                                 for (i = 0; i <  port->nr_snk_vdo; i++)
1080                                         response[i + 1] = port->snk_vdo[i];
1081                                 rlen = port->nr_snk_vdo + 1;
1082                         }
1083                         break;
1084                 case CMD_DISCOVER_SVID:
1085                         break;
1086                 case CMD_DISCOVER_MODES:
1087                         break;
1088                 case CMD_ENTER_MODE:
1089                         break;
1090                 case CMD_EXIT_MODE:
1091                         break;
1092                 case CMD_ATTENTION:
1093                         /* Attention command does not have response */
1094                         typec_altmode_attention(adev, p[1]);
1095                         return 0;
1096                 default:
1097                         break;
1098                 }
1099                 if (rlen >= 1) {
1100                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
1101                 } else if (rlen == 0) {
1102                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
1103                         rlen = 1;
1104                 } else {
1105                         response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
1106                         rlen = 1;
1107                 }
1108                 break;
1109         case CMDT_RSP_ACK:
1110                 /* silently drop message if we are not connected */
1111                 if (IS_ERR_OR_NULL(port->partner))
1112                         break;
1113
1114                 switch (cmd) {
1115                 case CMD_DISCOVER_IDENT:
1116                         /* 6.4.4.3.1 */
1117                         svdm_consume_identity(port, payload, cnt);
1118                         response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
1119                         rlen = 1;
1120                         break;
1121                 case CMD_DISCOVER_SVID:
1122                         /* 6.4.4.3.2 */
1123                         if (svdm_consume_svids(port, payload, cnt)) {
1124                                 response[0] = VDO(USB_SID_PD, 1,
1125                                                   CMD_DISCOVER_SVID);
1126                                 rlen = 1;
1127                         } else if (modep->nsvids && supports_modal(port)) {
1128                                 response[0] = VDO(modep->svids[0], 1,
1129                                                   CMD_DISCOVER_MODES);
1130                                 rlen = 1;
1131                         }
1132                         break;
1133                 case CMD_DISCOVER_MODES:
1134                         /* 6.4.4.3.3 */
1135                         svdm_consume_modes(port, payload, cnt);
1136                         modep->svid_index++;
1137                         if (modep->svid_index < modep->nsvids) {
1138                                 u16 svid = modep->svids[modep->svid_index];
1139                                 response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
1140                                 rlen = 1;
1141                         } else {
1142                                 tcpm_register_partner_altmodes(port);
1143                         }
1144                         break;
1145                 case CMD_ENTER_MODE:
1146                         typec_altmode_update_active(pdev, true);
1147
1148                         if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
1149                                 response[0] = VDO(adev->svid, 1, CMD_EXIT_MODE);
1150                                 response[0] |= VDO_OPOS(adev->mode);
1151                                 return 1;
1152                         }
1153                         return 0;
1154                 case CMD_EXIT_MODE:
1155                         typec_altmode_update_active(pdev, false);
1156
1157                         /* Back to USB Operation */
1158                         WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB,
1159                                                      NULL));
1160                         break;
1161                 default:
1162                         break;
1163                 }
1164                 break;
1165         case CMDT_RSP_NAK:
1166                 switch (cmd) {
1167                 case CMD_ENTER_MODE:
1168                         /* Back to USB Operation */
1169                         WARN_ON(typec_altmode_notify(adev, TYPEC_STATE_USB,
1170                                                      NULL));
1171                         break;
1172                 default:
1173                         break;
1174                 }
1175                 break;
1176         default:
1177                 break;
1178         }
1179
1180         /* Informing the alternate mode drivers about everything */
1181         typec_altmode_vdm(adev, p[0], &p[1], cnt);
1182
1183         return rlen;
1184 }
1185
1186 static void tcpm_handle_vdm_request(struct tcpm_port *port,
1187                                     const __le32 *payload, int cnt)
1188 {
1189         int rlen = 0;
1190         u32 response[8] = { };
1191         u32 p0 = le32_to_cpu(payload[0]);
1192
1193         if (port->vdm_state == VDM_STATE_BUSY) {
1194                 /* If UFP responded busy retry after timeout */
1195                 if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
1196                         port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
1197                         port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
1198                                 CMDT_INIT;
1199                         mod_delayed_work(port->wq, &port->vdm_state_machine,
1200                                          msecs_to_jiffies(PD_T_VDM_BUSY));
1201                         return;
1202                 }
1203                 port->vdm_state = VDM_STATE_DONE;
1204         }
1205
1206         if (PD_VDO_SVDM(p0))
1207                 rlen = tcpm_pd_svdm(port, payload, cnt, response);
1208
1209         if (rlen > 0) {
1210                 tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
1211                 mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1212         }
1213 }
1214
1215 static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
1216                           const u32 *data, int count)
1217 {
1218         u32 header;
1219
1220         if (WARN_ON(count > VDO_MAX_SIZE - 1))
1221                 count = VDO_MAX_SIZE - 1;
1222
1223         /* set VDM header with VID & CMD */
1224         header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1225                         1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
1226         tcpm_queue_vdm(port, header, data, count);
1227
1228         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1229 }
1230
1231 static unsigned int vdm_ready_timeout(u32 vdm_hdr)
1232 {
1233         unsigned int timeout;
1234         int cmd = PD_VDO_CMD(vdm_hdr);
1235
1236         /* its not a structured VDM command */
1237         if (!PD_VDO_SVDM(vdm_hdr))
1238                 return PD_T_VDM_UNSTRUCTURED;
1239
1240         switch (PD_VDO_CMDT(vdm_hdr)) {
1241         case CMDT_INIT:
1242                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1243                         timeout = PD_T_VDM_WAIT_MODE_E;
1244                 else
1245                         timeout = PD_T_VDM_SNDR_RSP;
1246                 break;
1247         default:
1248                 if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
1249                         timeout = PD_T_VDM_E_MODE;
1250                 else
1251                         timeout = PD_T_VDM_RCVR_RSP;
1252                 break;
1253         }
1254         return timeout;
1255 }
1256
1257 static void vdm_run_state_machine(struct tcpm_port *port)
1258 {
1259         struct pd_message msg;
1260         int i, res;
1261
1262         switch (port->vdm_state) {
1263         case VDM_STATE_READY:
1264                 /* Only transmit VDM if attached */
1265                 if (!port->attached) {
1266                         port->vdm_state = VDM_STATE_ERR_BUSY;
1267                         break;
1268                 }
1269
1270                 /*
1271                  * if there's traffic or we're not in PDO ready state don't send
1272                  * a VDM.
1273                  */
1274                 if (port->state != SRC_READY && port->state != SNK_READY)
1275                         break;
1276
1277                 /* Prepare and send VDM */
1278                 memset(&msg, 0, sizeof(msg));
1279                 msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
1280                                           port->pwr_role,
1281                                           port->data_role,
1282                                           port->negotiated_rev,
1283                                           port->message_id, port->vdo_count);
1284                 for (i = 0; i < port->vdo_count; i++)
1285                         msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
1286                 res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
1287                 if (res < 0) {
1288                         port->vdm_state = VDM_STATE_ERR_SEND;
1289                 } else {
1290                         unsigned long timeout;
1291
1292                         port->vdm_retries = 0;
1293                         port->vdm_state = VDM_STATE_BUSY;
1294                         timeout = vdm_ready_timeout(port->vdo_data[0]);
1295                         mod_delayed_work(port->wq, &port->vdm_state_machine,
1296                                          timeout);
1297                 }
1298                 break;
1299         case VDM_STATE_WAIT_RSP_BUSY:
1300                 port->vdo_data[0] = port->vdo_retry;
1301                 port->vdo_count = 1;
1302                 port->vdm_state = VDM_STATE_READY;
1303                 break;
1304         case VDM_STATE_BUSY:
1305                 port->vdm_state = VDM_STATE_ERR_TMOUT;
1306                 break;
1307         case VDM_STATE_ERR_SEND:
1308                 /*
1309                  * A partner which does not support USB PD will not reply,
1310                  * so this is not a fatal error. At the same time, some
1311                  * devices may not return GoodCRC under some circumstances,
1312                  * so we need to retry.
1313                  */
1314                 if (port->vdm_retries < 3) {
1315                         tcpm_log(port, "VDM Tx error, retry");
1316                         port->vdm_retries++;
1317                         port->vdm_state = VDM_STATE_READY;
1318                 }
1319                 break;
1320         default:
1321                 break;
1322         }
1323 }
1324
1325 static void vdm_state_machine_work(struct work_struct *work)
1326 {
1327         struct tcpm_port *port = container_of(work, struct tcpm_port,
1328                                               vdm_state_machine.work);
1329         enum vdm_states prev_state;
1330
1331         mutex_lock(&port->lock);
1332
1333         /*
1334          * Continue running as long as the port is not busy and there was
1335          * a state change.
1336          */
1337         do {
1338                 prev_state = port->vdm_state;
1339                 vdm_run_state_machine(port);
1340         } while (port->vdm_state != prev_state &&
1341                  port->vdm_state != VDM_STATE_BUSY);
1342
1343         mutex_unlock(&port->lock);
1344 }
1345
1346 enum pdo_err {
1347         PDO_NO_ERR,
1348         PDO_ERR_NO_VSAFE5V,
1349         PDO_ERR_VSAFE5V_NOT_FIRST,
1350         PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
1351         PDO_ERR_FIXED_NOT_SORTED,
1352         PDO_ERR_VARIABLE_BATT_NOT_SORTED,
1353         PDO_ERR_DUPE_PDO,
1354         PDO_ERR_PPS_APDO_NOT_SORTED,
1355         PDO_ERR_DUPE_PPS_APDO,
1356 };
1357
1358 static const char * const pdo_err_msg[] = {
1359         [PDO_ERR_NO_VSAFE5V] =
1360         " err: source/sink caps should atleast have vSafe5V",
1361         [PDO_ERR_VSAFE5V_NOT_FIRST] =
1362         " err: vSafe5V Fixed Supply Object Shall always be the first object",
1363         [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
1364         " err: PDOs should be in the following order: Fixed; Battery; Variable",
1365         [PDO_ERR_FIXED_NOT_SORTED] =
1366         " err: Fixed supply pdos should be in increasing order of their fixed voltage",
1367         [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
1368         " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
1369         [PDO_ERR_DUPE_PDO] =
1370         " err: Variable/Batt supply pdos cannot have same min/max voltage",
1371         [PDO_ERR_PPS_APDO_NOT_SORTED] =
1372         " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
1373         [PDO_ERR_DUPE_PPS_APDO] =
1374         " err: Programmable power supply apdos cannot have same min/max voltage and max current",
1375 };
1376
1377 static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
1378                                   unsigned int nr_pdo)
1379 {
1380         unsigned int i;
1381
1382         /* Should at least contain vSafe5v */
1383         if (nr_pdo < 1)
1384                 return PDO_ERR_NO_VSAFE5V;
1385
1386         /* The vSafe5V Fixed Supply Object Shall always be the first object */
1387         if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
1388             pdo_fixed_voltage(pdo[0]) != VSAFE5V)
1389                 return PDO_ERR_VSAFE5V_NOT_FIRST;
1390
1391         for (i = 1; i < nr_pdo; i++) {
1392                 if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
1393                         return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
1394                 } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
1395                         enum pd_pdo_type type = pdo_type(pdo[i]);
1396
1397                         switch (type) {
1398                         /*
1399                          * The remaining Fixed Supply Objects, if
1400                          * present, shall be sent in voltage order;
1401                          * lowest to highest.
1402                          */
1403                         case PDO_TYPE_FIXED:
1404                                 if (pdo_fixed_voltage(pdo[i]) <=
1405                                     pdo_fixed_voltage(pdo[i - 1]))
1406                                         return PDO_ERR_FIXED_NOT_SORTED;
1407                                 break;
1408                         /*
1409                          * The Battery Supply Objects and Variable
1410                          * supply, if present shall be sent in Minimum
1411                          * Voltage order; lowest to highest.
1412                          */
1413                         case PDO_TYPE_VAR:
1414                         case PDO_TYPE_BATT:
1415                                 if (pdo_min_voltage(pdo[i]) <
1416                                     pdo_min_voltage(pdo[i - 1]))
1417                                         return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
1418                                 else if ((pdo_min_voltage(pdo[i]) ==
1419                                           pdo_min_voltage(pdo[i - 1])) &&
1420                                          (pdo_max_voltage(pdo[i]) ==
1421                                           pdo_min_voltage(pdo[i - 1])))
1422                                         return PDO_ERR_DUPE_PDO;
1423                                 break;
1424                         /*
1425                          * The Programmable Power Supply APDOs, if present,
1426                          * shall be sent in Maximum Voltage order;
1427                          * lowest to highest.
1428                          */
1429                         case PDO_TYPE_APDO:
1430                                 if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
1431                                         break;
1432
1433                                 if (pdo_pps_apdo_max_current(pdo[i]) <
1434                                     pdo_pps_apdo_max_current(pdo[i - 1]))
1435                                         return PDO_ERR_PPS_APDO_NOT_SORTED;
1436                                 else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
1437                                           pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
1438                                          pdo_pps_apdo_max_voltage(pdo[i]) ==
1439                                           pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
1440                                          pdo_pps_apdo_max_current(pdo[i]) ==
1441                                           pdo_pps_apdo_max_current(pdo[i - 1]))
1442                                         return PDO_ERR_DUPE_PPS_APDO;
1443                                 break;
1444                         default:
1445                                 tcpm_log_force(port, " Unknown pdo type");
1446                         }
1447                 }
1448         }
1449
1450         return PDO_NO_ERR;
1451 }
1452
1453 static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
1454                               unsigned int nr_pdo)
1455 {
1456         enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
1457
1458         if (err_index != PDO_NO_ERR) {
1459                 tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
1460                 return -EINVAL;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static int tcpm_altmode_enter(struct typec_altmode *altmode)
1467 {
1468         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1469         u32 header;
1470
1471         mutex_lock(&port->lock);
1472         header = VDO(altmode->svid, 1, CMD_ENTER_MODE);
1473         header |= VDO_OPOS(altmode->mode);
1474
1475         tcpm_queue_vdm(port, header, NULL, 0);
1476         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1477         mutex_unlock(&port->lock);
1478
1479         return 0;
1480 }
1481
1482 static int tcpm_altmode_exit(struct typec_altmode *altmode)
1483 {
1484         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1485         u32 header;
1486
1487         mutex_lock(&port->lock);
1488         header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
1489         header |= VDO_OPOS(altmode->mode);
1490
1491         tcpm_queue_vdm(port, header, NULL, 0);
1492         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1493         mutex_unlock(&port->lock);
1494
1495         return 0;
1496 }
1497
1498 static int tcpm_altmode_vdm(struct typec_altmode *altmode,
1499                             u32 header, const u32 *data, int count)
1500 {
1501         struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
1502
1503         mutex_lock(&port->lock);
1504         tcpm_queue_vdm(port, header, data, count - 1);
1505         mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
1506         mutex_unlock(&port->lock);
1507
1508         return 0;
1509 }
1510
1511 static const struct typec_altmode_ops tcpm_altmode_ops = {
1512         .enter = tcpm_altmode_enter,
1513         .exit = tcpm_altmode_exit,
1514         .vdm = tcpm_altmode_vdm,
1515 };
1516
1517 /*
1518  * PD (data, control) command handling functions
1519  */
1520 static inline enum tcpm_state ready_state(struct tcpm_port *port)
1521 {
1522         if (port->pwr_role == TYPEC_SOURCE)
1523                 return SRC_READY;
1524         else
1525                 return SNK_READY;
1526 }
1527
1528 static int tcpm_pd_send_control(struct tcpm_port *port,
1529                                 enum pd_ctrl_msg_type type);
1530
1531 static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
1532                               int cnt)
1533 {
1534         u32 p0 = le32_to_cpu(payload[0]);
1535         unsigned int type = usb_pd_ado_type(p0);
1536
1537         if (!type) {
1538                 tcpm_log(port, "Alert message received with no type");
1539                 return;
1540         }
1541
1542         /* Just handling non-battery alerts for now */
1543         if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
1544                 switch (port->state) {
1545                 case SRC_READY:
1546                 case SNK_READY:
1547                         tcpm_set_state(port, GET_STATUS_SEND, 0);
1548                         break;
1549                 default:
1550                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1551                         break;
1552                 }
1553         }
1554 }
1555
1556 static void tcpm_pd_data_request(struct tcpm_port *port,
1557                                  const struct pd_message *msg)
1558 {
1559         enum pd_data_msg_type type = pd_header_type_le(msg->header);
1560         unsigned int cnt = pd_header_cnt_le(msg->header);
1561         unsigned int rev = pd_header_rev_le(msg->header);
1562         unsigned int i;
1563
1564         switch (type) {
1565         case PD_DATA_SOURCE_CAP:
1566                 if (port->pwr_role != TYPEC_SINK)
1567                         break;
1568
1569                 for (i = 0; i < cnt; i++)
1570                         port->source_caps[i] = le32_to_cpu(msg->payload[i]);
1571
1572                 port->nr_source_caps = cnt;
1573
1574                 tcpm_log_source_caps(port);
1575
1576                 tcpm_validate_caps(port, port->source_caps,
1577                                    port->nr_source_caps);
1578
1579                 /*
1580                  * Adjust revision in subsequent message headers, as required,
1581                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1582                  * support Rev 1.0 so just do nothing in that scenario.
1583                  */
1584                 if (rev == PD_REV10)
1585                         break;
1586
1587                 if (rev < PD_MAX_REV)
1588                         port->negotiated_rev = rev;
1589
1590                 /*
1591                  * This message may be received even if VBUS is not
1592                  * present. This is quite unexpected; see USB PD
1593                  * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
1594                  * However, at the same time, we must be ready to
1595                  * receive this message and respond to it 15ms after
1596                  * receiving PS_RDY during power swap operations, no matter
1597                  * if VBUS is available or not (USB PD specification,
1598                  * section 6.5.9.2).
1599                  * So we need to accept the message either way,
1600                  * but be prepared to keep waiting for VBUS after it was
1601                  * handled.
1602                  */
1603                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
1604                 break;
1605         case PD_DATA_REQUEST:
1606                 if (port->pwr_role != TYPEC_SOURCE ||
1607                     cnt != 1) {
1608                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1609                         break;
1610                 }
1611
1612                 /*
1613                  * Adjust revision in subsequent message headers, as required,
1614                  * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
1615                  * support Rev 1.0 so just reject in that scenario.
1616                  */
1617                 if (rev == PD_REV10) {
1618                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1619                         break;
1620                 }
1621
1622                 if (rev < PD_MAX_REV)
1623                         port->negotiated_rev = rev;
1624
1625                 port->sink_request = le32_to_cpu(msg->payload[0]);
1626                 tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
1627                 break;
1628         case PD_DATA_SINK_CAP:
1629                 /* We don't do anything with this at the moment... */
1630                 for (i = 0; i < cnt; i++)
1631                         port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
1632                 port->nr_sink_caps = cnt;
1633                 break;
1634         case PD_DATA_VENDOR_DEF:
1635                 tcpm_handle_vdm_request(port, msg->payload, cnt);
1636                 break;
1637         case PD_DATA_BIST:
1638                 if (port->state == SRC_READY || port->state == SNK_READY) {
1639                         port->bist_request = le32_to_cpu(msg->payload[0]);
1640                         tcpm_set_state(port, BIST_RX, 0);
1641                 }
1642                 break;
1643         case PD_DATA_ALERT:
1644                 tcpm_handle_alert(port, msg->payload, cnt);
1645                 break;
1646         case PD_DATA_BATT_STATUS:
1647         case PD_DATA_GET_COUNTRY_INFO:
1648                 /* Currently unsupported */
1649                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1650                 break;
1651         default:
1652                 tcpm_log(port, "Unhandled data message type %#x", type);
1653                 break;
1654         }
1655 }
1656
1657 static void tcpm_pps_complete(struct tcpm_port *port, int result)
1658 {
1659         if (port->pps_pending) {
1660                 port->pps_status = result;
1661                 port->pps_pending = false;
1662                 complete(&port->pps_complete);
1663         }
1664 }
1665
1666 static void tcpm_pd_ctrl_request(struct tcpm_port *port,
1667                                  const struct pd_message *msg)
1668 {
1669         enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1670         enum tcpm_state next_state;
1671
1672         switch (type) {
1673         case PD_CTRL_GOOD_CRC:
1674         case PD_CTRL_PING:
1675                 break;
1676         case PD_CTRL_GET_SOURCE_CAP:
1677                 switch (port->state) {
1678                 case SRC_READY:
1679                 case SNK_READY:
1680                         tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
1681                         break;
1682                 default:
1683                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1684                         break;
1685                 }
1686                 break;
1687         case PD_CTRL_GET_SINK_CAP:
1688                 switch (port->state) {
1689                 case SRC_READY:
1690                 case SNK_READY:
1691                         tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
1692                         break;
1693                 default:
1694                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1695                         break;
1696                 }
1697                 break;
1698         case PD_CTRL_GOTO_MIN:
1699                 break;
1700         case PD_CTRL_PS_RDY:
1701                 switch (port->state) {
1702                 case SNK_TRANSITION_SINK:
1703                         if (port->vbus_present) {
1704                                 tcpm_set_current_limit(port,
1705                                                        port->current_limit,
1706                                                        port->supply_voltage);
1707                                 port->explicit_contract = true;
1708                                 tcpm_set_state(port, SNK_READY, 0);
1709                         } else {
1710                                 /*
1711                                  * Seen after power swap. Keep waiting for VBUS
1712                                  * in a transitional state.
1713                                  */
1714                                 tcpm_set_state(port,
1715                                                SNK_TRANSITION_SINK_VBUS, 0);
1716                         }
1717                         break;
1718                 case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
1719                         tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
1720                         break;
1721                 case PR_SWAP_SNK_SRC_SINK_OFF:
1722                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
1723                         break;
1724                 case VCONN_SWAP_WAIT_FOR_VCONN:
1725                         tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
1726                         break;
1727                 default:
1728                         break;
1729                 }
1730                 break;
1731         case PD_CTRL_REJECT:
1732         case PD_CTRL_WAIT:
1733         case PD_CTRL_NOT_SUPP:
1734                 switch (port->state) {
1735                 case SNK_NEGOTIATE_CAPABILITIES:
1736                         /* USB PD specification, Figure 8-43 */
1737                         if (port->explicit_contract)
1738                                 next_state = SNK_READY;
1739                         else
1740                                 next_state = SNK_WAIT_CAPABILITIES;
1741                         tcpm_set_state(port, next_state, 0);
1742                         break;
1743                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1744                         /* Revert data back from any requested PPS updates */
1745                         port->pps_data.out_volt = port->supply_voltage;
1746                         port->pps_data.op_curr = port->current_limit;
1747                         port->pps_status = (type == PD_CTRL_WAIT ?
1748                                             -EAGAIN : -EOPNOTSUPP);
1749                         tcpm_set_state(port, SNK_READY, 0);
1750                         break;
1751                 case DR_SWAP_SEND:
1752                         port->swap_status = (type == PD_CTRL_WAIT ?
1753                                              -EAGAIN : -EOPNOTSUPP);
1754                         tcpm_set_state(port, DR_SWAP_CANCEL, 0);
1755                         break;
1756                 case PR_SWAP_SEND:
1757                         port->swap_status = (type == PD_CTRL_WAIT ?
1758                                              -EAGAIN : -EOPNOTSUPP);
1759                         tcpm_set_state(port, PR_SWAP_CANCEL, 0);
1760                         break;
1761                 case VCONN_SWAP_SEND:
1762                         port->swap_status = (type == PD_CTRL_WAIT ?
1763                                              -EAGAIN : -EOPNOTSUPP);
1764                         tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
1765                         break;
1766                 default:
1767                         break;
1768                 }
1769                 break;
1770         case PD_CTRL_ACCEPT:
1771                 switch (port->state) {
1772                 case SNK_NEGOTIATE_CAPABILITIES:
1773                         port->pps_data.active = false;
1774                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1775                         break;
1776                 case SNK_NEGOTIATE_PPS_CAPABILITIES:
1777                         port->pps_data.active = true;
1778                         port->supply_voltage = port->pps_data.out_volt;
1779                         port->current_limit = port->pps_data.op_curr;
1780                         tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
1781                         break;
1782                 case SOFT_RESET_SEND:
1783                         port->message_id = 0;
1784                         port->rx_msgid = -1;
1785                         if (port->pwr_role == TYPEC_SOURCE)
1786                                 next_state = SRC_SEND_CAPABILITIES;
1787                         else
1788                                 next_state = SNK_WAIT_CAPABILITIES;
1789                         tcpm_set_state(port, next_state, 0);
1790                         break;
1791                 case DR_SWAP_SEND:
1792                         tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
1793                         break;
1794                 case PR_SWAP_SEND:
1795                         tcpm_set_state(port, PR_SWAP_START, 0);
1796                         break;
1797                 case VCONN_SWAP_SEND:
1798                         tcpm_set_state(port, VCONN_SWAP_START, 0);
1799                         break;
1800                 default:
1801                         break;
1802                 }
1803                 break;
1804         case PD_CTRL_SOFT_RESET:
1805                 tcpm_set_state(port, SOFT_RESET, 0);
1806                 break;
1807         case PD_CTRL_DR_SWAP:
1808                 if (port->port_type != TYPEC_PORT_DRP) {
1809                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1810                         break;
1811                 }
1812                 /*
1813                  * XXX
1814                  * 6.3.9: If an alternate mode is active, a request to swap
1815                  * alternate modes shall trigger a port reset.
1816                  */
1817                 switch (port->state) {
1818                 case SRC_READY:
1819                 case SNK_READY:
1820                         tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
1821                         break;
1822                 default:
1823                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1824                         break;
1825                 }
1826                 break;
1827         case PD_CTRL_PR_SWAP:
1828                 if (port->port_type != TYPEC_PORT_DRP) {
1829                         tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
1830                         break;
1831                 }
1832                 switch (port->state) {
1833                 case SRC_READY:
1834                 case SNK_READY:
1835                         tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
1836                         break;
1837                 default:
1838                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1839                         break;
1840                 }
1841                 break;
1842         case PD_CTRL_VCONN_SWAP:
1843                 switch (port->state) {
1844                 case SRC_READY:
1845                 case SNK_READY:
1846                         tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
1847                         break;
1848                 default:
1849                         tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
1850                         break;
1851                 }
1852                 break;
1853         case PD_CTRL_GET_SOURCE_CAP_EXT:
1854         case PD_CTRL_GET_STATUS:
1855         case PD_CTRL_FR_SWAP:
1856         case PD_CTRL_GET_PPS_STATUS:
1857         case PD_CTRL_GET_COUNTRY_CODES:
1858                 /* Currently not supported */
1859                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1860                 break;
1861         default:
1862                 tcpm_log(port, "Unhandled ctrl message type %#x", type);
1863                 break;
1864         }
1865 }
1866
1867 static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
1868                                     const struct pd_message *msg)
1869 {
1870         enum pd_ext_msg_type type = pd_header_type_le(msg->header);
1871         unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
1872
1873         if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
1874                 tcpm_log(port, "Unchunked extended messages unsupported");
1875                 return;
1876         }
1877
1878         if (data_size > PD_EXT_MAX_CHUNK_DATA) {
1879                 tcpm_log(port, "Chunk handling not yet supported");
1880                 return;
1881         }
1882
1883         switch (type) {
1884         case PD_EXT_STATUS:
1885                 /*
1886                  * If PPS related events raised then get PPS status to clear
1887                  * (see USB PD 3.0 Spec, 6.5.2.4)
1888                  */
1889                 if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
1890                     USB_PD_EXT_SDB_PPS_EVENTS)
1891                         tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
1892                 else
1893                         tcpm_set_state(port, ready_state(port), 0);
1894                 break;
1895         case PD_EXT_PPS_STATUS:
1896                 /*
1897                  * For now the PPS status message is used to clear events
1898                  * and nothing more.
1899                  */
1900                 tcpm_set_state(port, ready_state(port), 0);
1901                 break;
1902         case PD_EXT_SOURCE_CAP_EXT:
1903         case PD_EXT_GET_BATT_CAP:
1904         case PD_EXT_GET_BATT_STATUS:
1905         case PD_EXT_BATT_CAP:
1906         case PD_EXT_GET_MANUFACTURER_INFO:
1907         case PD_EXT_MANUFACTURER_INFO:
1908         case PD_EXT_SECURITY_REQUEST:
1909         case PD_EXT_SECURITY_RESPONSE:
1910         case PD_EXT_FW_UPDATE_REQUEST:
1911         case PD_EXT_FW_UPDATE_RESPONSE:
1912         case PD_EXT_COUNTRY_INFO:
1913         case PD_EXT_COUNTRY_CODES:
1914                 tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
1915                 break;
1916         default:
1917                 tcpm_log(port, "Unhandled extended message type %#x", type);
1918                 break;
1919         }
1920 }
1921
1922 static void tcpm_pd_rx_handler(struct work_struct *work)
1923 {
1924         struct pd_rx_event *event = container_of(work,
1925                                                  struct pd_rx_event, work);
1926         const struct pd_message *msg = &event->msg;
1927         unsigned int cnt = pd_header_cnt_le(msg->header);
1928         struct tcpm_port *port = event->port;
1929
1930         mutex_lock(&port->lock);
1931
1932         tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
1933                  port->attached);
1934
1935         if (port->attached) {
1936                 enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
1937                 unsigned int msgid = pd_header_msgid_le(msg->header);
1938
1939                 /*
1940                  * USB PD standard, 6.6.1.2:
1941                  * "... if MessageID value in a received Message is the
1942                  * same as the stored value, the receiver shall return a
1943                  * GoodCRC Message with that MessageID value and drop
1944                  * the Message (this is a retry of an already received
1945                  * Message). Note: this shall not apply to the Soft_Reset
1946                  * Message which always has a MessageID value of zero."
1947                  */
1948                 if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
1949                         goto done;
1950                 port->rx_msgid = msgid;
1951
1952                 /*
1953                  * If both ends believe to be DFP/host, we have a data role
1954                  * mismatch.
1955                  */
1956                 if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
1957                     (port->data_role == TYPEC_HOST)) {
1958                         tcpm_log(port,
1959                                  "Data role mismatch, initiating error recovery");
1960                         tcpm_set_state(port, ERROR_RECOVERY, 0);
1961                 } else {
1962                         if (msg->header & PD_HEADER_EXT_HDR)
1963                                 tcpm_pd_ext_msg_request(port, msg);
1964                         else if (cnt)
1965                                 tcpm_pd_data_request(port, msg);
1966                         else
1967                                 tcpm_pd_ctrl_request(port, msg);
1968                 }
1969         }
1970
1971 done:
1972         mutex_unlock(&port->lock);
1973         kfree(event);
1974 }
1975
1976 void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
1977 {
1978         struct pd_rx_event *event;
1979
1980         event = kzalloc(sizeof(*event), GFP_ATOMIC);
1981         if (!event)
1982                 return;
1983
1984         INIT_WORK(&event->work, tcpm_pd_rx_handler);
1985         event->port = port;
1986         memcpy(&event->msg, msg, sizeof(*msg));
1987         queue_work(port->wq, &event->work);
1988 }
1989 EXPORT_SYMBOL_GPL(tcpm_pd_receive);
1990
1991 static int tcpm_pd_send_control(struct tcpm_port *port,
1992                                 enum pd_ctrl_msg_type type)
1993 {
1994         struct pd_message msg;
1995
1996         memset(&msg, 0, sizeof(msg));
1997         msg.header = PD_HEADER_LE(type, port->pwr_role,
1998                                   port->data_role,
1999                                   port->negotiated_rev,
2000                                   port->message_id, 0);
2001
2002         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2003 }
2004
2005 /*
2006  * Send queued message without affecting state.
2007  * Return true if state machine should go back to sleep,
2008  * false otherwise.
2009  */
2010 static bool tcpm_send_queued_message(struct tcpm_port *port)
2011 {
2012         enum pd_msg_request queued_message;
2013
2014         do {
2015                 queued_message = port->queued_message;
2016                 port->queued_message = PD_MSG_NONE;
2017
2018                 switch (queued_message) {
2019                 case PD_MSG_CTRL_WAIT:
2020                         tcpm_pd_send_control(port, PD_CTRL_WAIT);
2021                         break;
2022                 case PD_MSG_CTRL_REJECT:
2023                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
2024                         break;
2025                 case PD_MSG_CTRL_NOT_SUPP:
2026                         tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
2027                         break;
2028                 case PD_MSG_DATA_SINK_CAP:
2029                         tcpm_pd_send_sink_caps(port);
2030                         break;
2031                 case PD_MSG_DATA_SOURCE_CAP:
2032                         tcpm_pd_send_source_caps(port);
2033                         break;
2034                 default:
2035                         break;
2036                 }
2037         } while (port->queued_message != PD_MSG_NONE);
2038
2039         if (port->delayed_state != INVALID_STATE) {
2040                 if (time_is_after_jiffies(port->delayed_runtime)) {
2041                         mod_delayed_work(port->wq, &port->state_machine,
2042                                          port->delayed_runtime - jiffies);
2043                         return true;
2044                 }
2045                 port->delayed_state = INVALID_STATE;
2046         }
2047         return false;
2048 }
2049
2050 static int tcpm_pd_check_request(struct tcpm_port *port)
2051 {
2052         u32 pdo, rdo = port->sink_request;
2053         unsigned int max, op, pdo_max, index;
2054         enum pd_pdo_type type;
2055
2056         index = rdo_index(rdo);
2057         if (!index || index > port->nr_src_pdo)
2058                 return -EINVAL;
2059
2060         pdo = port->src_pdo[index - 1];
2061         type = pdo_type(pdo);
2062         switch (type) {
2063         case PDO_TYPE_FIXED:
2064         case PDO_TYPE_VAR:
2065                 max = rdo_max_current(rdo);
2066                 op = rdo_op_current(rdo);
2067                 pdo_max = pdo_max_current(pdo);
2068
2069                 if (op > pdo_max)
2070                         return -EINVAL;
2071                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2072                         return -EINVAL;
2073
2074                 if (type == PDO_TYPE_FIXED)
2075                         tcpm_log(port,
2076                                  "Requested %u mV, %u mA for %u / %u mA",
2077                                  pdo_fixed_voltage(pdo), pdo_max, op, max);
2078                 else
2079                         tcpm_log(port,
2080                                  "Requested %u -> %u mV, %u mA for %u / %u mA",
2081                                  pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2082                                  pdo_max, op, max);
2083                 break;
2084         case PDO_TYPE_BATT:
2085                 max = rdo_max_power(rdo);
2086                 op = rdo_op_power(rdo);
2087                 pdo_max = pdo_max_power(pdo);
2088
2089                 if (op > pdo_max)
2090                         return -EINVAL;
2091                 if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
2092                         return -EINVAL;
2093                 tcpm_log(port,
2094                          "Requested %u -> %u mV, %u mW for %u / %u mW",
2095                          pdo_min_voltage(pdo), pdo_max_voltage(pdo),
2096                          pdo_max, op, max);
2097                 break;
2098         default:
2099                 return -EINVAL;
2100         }
2101
2102         port->op_vsafe5v = index == 1;
2103
2104         return 0;
2105 }
2106
2107 #define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
2108 #define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
2109
2110 static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
2111                               int *src_pdo)
2112 {
2113         unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
2114                      max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
2115                      min_snk_mv = 0;
2116         int ret = -EINVAL;
2117
2118         port->pps_data.supported = false;
2119         port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
2120
2121         /*
2122          * Select the source PDO providing the most power which has a
2123          * matchig sink cap.
2124          */
2125         for (i = 0; i < port->nr_source_caps; i++) {
2126                 u32 pdo = port->source_caps[i];
2127                 enum pd_pdo_type type = pdo_type(pdo);
2128
2129                 switch (type) {
2130                 case PDO_TYPE_FIXED:
2131                         max_src_mv = pdo_fixed_voltage(pdo);
2132                         min_src_mv = max_src_mv;
2133                         break;
2134                 case PDO_TYPE_BATT:
2135                 case PDO_TYPE_VAR:
2136                         max_src_mv = pdo_max_voltage(pdo);
2137                         min_src_mv = pdo_min_voltage(pdo);
2138                         break;
2139                 case PDO_TYPE_APDO:
2140                         if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
2141                                 port->pps_data.supported = true;
2142                                 port->usb_type =
2143                                         POWER_SUPPLY_USB_TYPE_PD_PPS;
2144                         }
2145                         continue;
2146                 default:
2147                         tcpm_log(port, "Invalid source PDO type, ignoring");
2148                         continue;
2149                 }
2150
2151                 switch (type) {
2152                 case PDO_TYPE_FIXED:
2153                 case PDO_TYPE_VAR:
2154                         src_ma = pdo_max_current(pdo);
2155                         src_mw = src_ma * min_src_mv / 1000;
2156                         break;
2157                 case PDO_TYPE_BATT:
2158                         src_mw = pdo_max_power(pdo);
2159                         break;
2160                 case PDO_TYPE_APDO:
2161                         continue;
2162                 default:
2163                         tcpm_log(port, "Invalid source PDO type, ignoring");
2164                         continue;
2165                 }
2166
2167                 for (j = 0; j < port->nr_snk_pdo; j++) {
2168                         pdo = port->snk_pdo[j];
2169
2170                         switch (pdo_type(pdo)) {
2171                         case PDO_TYPE_FIXED:
2172                                 max_snk_mv = pdo_fixed_voltage(pdo);
2173                                 min_snk_mv = max_snk_mv;
2174                                 break;
2175                         case PDO_TYPE_BATT:
2176                         case PDO_TYPE_VAR:
2177                                 max_snk_mv = pdo_max_voltage(pdo);
2178                                 min_snk_mv = pdo_min_voltage(pdo);
2179                                 break;
2180                         case PDO_TYPE_APDO:
2181                                 continue;
2182                         default:
2183                                 tcpm_log(port, "Invalid sink PDO type, ignoring");
2184                                 continue;
2185                         }
2186
2187                         if (max_src_mv <= max_snk_mv &&
2188                                 min_src_mv >= min_snk_mv) {
2189                                 /* Prefer higher voltages if available */
2190                                 if ((src_mw == max_mw && min_src_mv > max_mv) ||
2191                                                         src_mw > max_mw) {
2192                                         *src_pdo = i;
2193                                         *sink_pdo = j;
2194                                         max_mw = src_mw;
2195                                         max_mv = min_src_mv;
2196                                         ret = 0;
2197                                 }
2198                         }
2199                 }
2200         }
2201
2202         return ret;
2203 }
2204
2205 #define min_pps_apdo_current(x, y)      \
2206         min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
2207
2208 static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
2209 {
2210         unsigned int i, j, max_mw = 0, max_mv = 0;
2211         unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
2212         unsigned int min_snk_mv, max_snk_mv, snk_ma;
2213         u32 pdo;
2214         unsigned int src_pdo = 0, snk_pdo = 0;
2215
2216         /*
2217          * Select the source PPS APDO providing the most power while staying
2218          * within the board's limits. We skip the first PDO as this is always
2219          * 5V 3A.
2220          */
2221         for (i = 1; i < port->nr_source_caps; ++i) {
2222                 pdo = port->source_caps[i];
2223
2224                 switch (pdo_type(pdo)) {
2225                 case PDO_TYPE_APDO:
2226                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2227                                 tcpm_log(port, "Not PPS APDO (source), ignoring");
2228                                 continue;
2229                         }
2230
2231                         min_src_mv = pdo_pps_apdo_min_voltage(pdo);
2232                         max_src_mv = pdo_pps_apdo_max_voltage(pdo);
2233                         src_ma = pdo_pps_apdo_max_current(pdo);
2234                         src_mw = (src_ma * max_src_mv) / 1000;
2235
2236                         /*
2237                          * Now search through the sink PDOs to find a matching
2238                          * PPS APDO. Again skip the first sink PDO as this will
2239                          * always be 5V 3A.
2240                          */
2241                         for (j = 1; j < port->nr_snk_pdo; j++) {
2242                                 pdo = port->snk_pdo[j];
2243
2244                                 switch (pdo_type(pdo)) {
2245                                 case PDO_TYPE_APDO:
2246                                         if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2247                                                 tcpm_log(port,
2248                                                          "Not PPS APDO (sink), ignoring");
2249                                                 continue;
2250                                         }
2251
2252                                         min_snk_mv =
2253                                                 pdo_pps_apdo_min_voltage(pdo);
2254                                         max_snk_mv =
2255                                                 pdo_pps_apdo_max_voltage(pdo);
2256                                         snk_ma =
2257                                                 pdo_pps_apdo_max_current(pdo);
2258                                         break;
2259                                 default:
2260                                         tcpm_log(port,
2261                                                  "Not APDO type (sink), ignoring");
2262                                         continue;
2263                                 }
2264
2265                                 if (max_src_mv <= max_snk_mv &&
2266                                     min_src_mv >= min_snk_mv) {
2267                                         /* Prefer higher voltages if available */
2268                                         if ((src_mw == max_mw &&
2269                                              min_src_mv > max_mv) ||
2270                                             src_mw > max_mw) {
2271                                                 src_pdo = i;
2272                                                 snk_pdo = j;
2273                                                 max_mw = src_mw;
2274                                                 max_mv = max_src_mv;
2275                                         }
2276                                 }
2277                         }
2278
2279                         break;
2280                 default:
2281                         tcpm_log(port, "Not APDO type (source), ignoring");
2282                         continue;
2283                 }
2284         }
2285
2286         if (src_pdo) {
2287                 pdo = port->source_caps[src_pdo];
2288
2289                 port->pps_data.min_volt = pdo_pps_apdo_min_voltage(pdo);
2290                 port->pps_data.max_volt = pdo_pps_apdo_max_voltage(pdo);
2291                 port->pps_data.max_curr =
2292                         min_pps_apdo_current(pdo, port->snk_pdo[snk_pdo]);
2293                 port->pps_data.out_volt =
2294                         min(pdo_pps_apdo_max_voltage(pdo), port->pps_data.out_volt);
2295                 port->pps_data.op_curr =
2296                         min(port->pps_data.max_curr, port->pps_data.op_curr);
2297         }
2298
2299         return src_pdo;
2300 }
2301
2302 static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
2303 {
2304         unsigned int mv, ma, mw, flags;
2305         unsigned int max_ma, max_mw;
2306         enum pd_pdo_type type;
2307         u32 pdo, matching_snk_pdo;
2308         int src_pdo_index = 0;
2309         int snk_pdo_index = 0;
2310         int ret;
2311
2312         ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
2313         if (ret < 0)
2314                 return ret;
2315
2316         pdo = port->source_caps[src_pdo_index];
2317         matching_snk_pdo = port->snk_pdo[snk_pdo_index];
2318         type = pdo_type(pdo);
2319
2320         switch (type) {
2321         case PDO_TYPE_FIXED:
2322                 mv = pdo_fixed_voltage(pdo);
2323                 break;
2324         case PDO_TYPE_BATT:
2325         case PDO_TYPE_VAR:
2326                 mv = pdo_min_voltage(pdo);
2327                 break;
2328         default:
2329                 tcpm_log(port, "Invalid PDO selected!");
2330                 return -EINVAL;
2331         }
2332
2333         /* Select maximum available current within the sink pdo's limit */
2334         if (type == PDO_TYPE_BATT) {
2335                 mw = min_power(pdo, matching_snk_pdo);
2336                 ma = 1000 * mw / mv;
2337         } else {
2338                 ma = min_current(pdo, matching_snk_pdo);
2339                 mw = ma * mv / 1000;
2340         }
2341
2342         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2343
2344         /* Set mismatch bit if offered power is less than operating power */
2345         max_ma = ma;
2346         max_mw = mw;
2347         if (mw < port->operating_snk_mw) {
2348                 flags |= RDO_CAP_MISMATCH;
2349                 if (type == PDO_TYPE_BATT &&
2350                     (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
2351                         max_mw = pdo_max_power(matching_snk_pdo);
2352                 else if (pdo_max_current(matching_snk_pdo) >
2353                          pdo_max_current(pdo))
2354                         max_ma = pdo_max_current(matching_snk_pdo);
2355         }
2356
2357         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2358                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
2359                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2360                  port->polarity);
2361
2362         if (type == PDO_TYPE_BATT) {
2363                 *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
2364
2365                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
2366                          src_pdo_index, mv, mw,
2367                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2368         } else {
2369                 *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
2370
2371                 tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
2372                          src_pdo_index, mv, ma,
2373                          flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
2374         }
2375
2376         port->current_limit = ma;
2377         port->supply_voltage = mv;
2378
2379         return 0;
2380 }
2381
2382 static int tcpm_pd_send_request(struct tcpm_port *port)
2383 {
2384         struct pd_message msg;
2385         int ret;
2386         u32 rdo;
2387
2388         ret = tcpm_pd_build_request(port, &rdo);
2389         if (ret < 0)
2390                 return ret;
2391
2392         memset(&msg, 0, sizeof(msg));
2393         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2394                                   port->pwr_role,
2395                                   port->data_role,
2396                                   port->negotiated_rev,
2397                                   port->message_id, 1);
2398         msg.payload[0] = cpu_to_le32(rdo);
2399
2400         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2401 }
2402
2403 static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
2404 {
2405         unsigned int out_mv, op_ma, op_mw, min_mv, max_mv, max_ma, flags;
2406         enum pd_pdo_type type;
2407         unsigned int src_pdo_index;
2408         u32 pdo;
2409
2410         src_pdo_index = tcpm_pd_select_pps_apdo(port);
2411         if (!src_pdo_index)
2412                 return -EOPNOTSUPP;
2413
2414         pdo = port->source_caps[src_pdo_index];
2415         type = pdo_type(pdo);
2416
2417         switch (type) {
2418         case PDO_TYPE_APDO:
2419                 if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
2420                         tcpm_log(port, "Invalid APDO selected!");
2421                         return -EINVAL;
2422                 }
2423                 min_mv = port->pps_data.min_volt;
2424                 max_mv = port->pps_data.max_volt;
2425                 max_ma = port->pps_data.max_curr;
2426                 out_mv = port->pps_data.out_volt;
2427                 op_ma = port->pps_data.op_curr;
2428                 break;
2429         default:
2430                 tcpm_log(port, "Invalid PDO selected!");
2431                 return -EINVAL;
2432         }
2433
2434         flags = RDO_USB_COMM | RDO_NO_SUSPEND;
2435
2436         op_mw = (op_ma * out_mv) / 1000;
2437         if (op_mw < port->operating_snk_mw) {
2438                 /*
2439                  * Try raising current to meet power needs. If that's not enough
2440                  * then try upping the voltage. If that's still not enough
2441                  * then we've obviously chosen a PPS APDO which really isn't
2442                  * suitable so abandon ship.
2443                  */
2444                 op_ma = (port->operating_snk_mw * 1000) / out_mv;
2445                 if ((port->operating_snk_mw * 1000) % out_mv)
2446                         ++op_ma;
2447                 op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
2448
2449                 if (op_ma > max_ma) {
2450                         op_ma = max_ma;
2451                         out_mv = (port->operating_snk_mw * 1000) / op_ma;
2452                         if ((port->operating_snk_mw * 1000) % op_ma)
2453                                 ++out_mv;
2454                         out_mv += RDO_PROG_VOLT_MV_STEP -
2455                                   (out_mv % RDO_PROG_VOLT_MV_STEP);
2456
2457                         if (out_mv > max_mv) {
2458                                 tcpm_log(port, "Invalid PPS APDO selected!");
2459                                 return -EINVAL;
2460                         }
2461                 }
2462         }
2463
2464         tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
2465                  port->cc_req, port->cc1, port->cc2, port->vbus_source,
2466                  port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
2467                  port->polarity);
2468
2469         *rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
2470
2471         tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
2472                  src_pdo_index, out_mv, op_ma);
2473
2474         port->pps_data.op_curr = op_ma;
2475         port->pps_data.out_volt = out_mv;
2476
2477         return 0;
2478 }
2479
2480 static int tcpm_pd_send_pps_request(struct tcpm_port *port)
2481 {
2482         struct pd_message msg;
2483         int ret;
2484         u32 rdo;
2485
2486         ret = tcpm_pd_build_pps_request(port, &rdo);
2487         if (ret < 0)
2488                 return ret;
2489
2490         memset(&msg, 0, sizeof(msg));
2491         msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
2492                                   port->pwr_role,
2493                                   port->data_role,
2494                                   port->negotiated_rev,
2495                                   port->message_id, 1);
2496         msg.payload[0] = cpu_to_le32(rdo);
2497
2498         return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
2499 }
2500
2501 static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
2502 {
2503         int ret;
2504
2505         if (enable && port->vbus_charge)
2506                 return -EINVAL;
2507
2508         tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
2509
2510         ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
2511         if (ret < 0)
2512                 return ret;
2513
2514         port->vbus_source = enable;
2515         return 0;
2516 }
2517
2518 static int tcpm_set_charge(struct tcpm_port *port, bool charge)
2519 {
2520         int ret;
2521
2522         if (charge && port->vbus_source)
2523                 return -EINVAL;
2524
2525         if (charge != port->vbus_charge) {
2526                 tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
2527                 ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
2528                                            charge);
2529                 if (ret < 0)
2530                         return ret;
2531         }
2532         port->vbus_charge = charge;
2533         return 0;
2534 }
2535
2536 static bool tcpm_start_drp_toggling(struct tcpm_port *port,
2537                                     enum typec_cc_status cc)
2538 {
2539         int ret;
2540
2541         if (port->tcpc->start_drp_toggling &&
2542             port->port_type == TYPEC_PORT_DRP) {
2543                 tcpm_log_force(port, "Start DRP toggling");
2544                 ret = port->tcpc->start_drp_toggling(port->tcpc, cc);
2545                 if (!ret)
2546                         return true;
2547         }
2548
2549         return false;
2550 }
2551
2552 static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
2553 {
2554         tcpm_log(port, "cc:=%d", cc);
2555         port->cc_req = cc;
2556         port->tcpc->set_cc(port->tcpc, cc);
2557 }
2558
2559 static int tcpm_init_vbus(struct tcpm_port *port)
2560 {
2561         int ret;
2562
2563         ret = port->tcpc->set_vbus(port->tcpc, false, false);
2564         port->vbus_source = false;
2565         port->vbus_charge = false;
2566         return ret;
2567 }
2568
2569 static int tcpm_init_vconn(struct tcpm_port *port)
2570 {
2571         int ret;
2572
2573         ret = port->tcpc->set_vconn(port->tcpc, false);
2574         port->vconn_role = TYPEC_SINK;
2575         return ret;
2576 }
2577
2578 static void tcpm_typec_connect(struct tcpm_port *port)
2579 {
2580         if (!port->connected) {
2581                 /* Make sure we don't report stale identity information */
2582                 memset(&port->partner_ident, 0, sizeof(port->partner_ident));
2583                 port->partner_desc.usb_pd = port->pd_capable;
2584                 if (tcpm_port_is_debug(port))
2585                         port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
2586                 else if (tcpm_port_is_audio(port))
2587                         port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
2588                 else
2589                         port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
2590                 port->partner = typec_register_partner(port->typec_port,
2591                                                        &port->partner_desc);
2592                 port->connected = true;
2593         }
2594 }
2595
2596 static int tcpm_src_attach(struct tcpm_port *port)
2597 {
2598         enum typec_cc_polarity polarity =
2599                                 port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
2600                                                          : TYPEC_POLARITY_CC1;
2601         int ret;
2602
2603         if (port->attached)
2604                 return 0;
2605
2606         ret = tcpm_set_polarity(port, polarity);
2607         if (ret < 0)
2608                 return ret;
2609
2610         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2611         if (ret < 0)
2612                 return ret;
2613
2614         ret = port->tcpc->set_pd_rx(port->tcpc, true);
2615         if (ret < 0)
2616                 goto out_disable_mux;
2617
2618         /*
2619          * USB Type-C specification, version 1.2,
2620          * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
2621          * Enable VCONN only if the non-RD port is set to RA.
2622          */
2623         if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
2624             (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
2625                 ret = tcpm_set_vconn(port, true);
2626                 if (ret < 0)
2627                         goto out_disable_pd;
2628         }
2629
2630         ret = tcpm_set_vbus(port, true);
2631         if (ret < 0)
2632                 goto out_disable_vconn;
2633
2634         port->pd_capable = false;
2635
2636         port->partner = NULL;
2637
2638         port->attached = true;
2639         port->send_discover = true;
2640
2641         return 0;
2642
2643 out_disable_vconn:
2644         tcpm_set_vconn(port, false);
2645 out_disable_pd:
2646         port->tcpc->set_pd_rx(port->tcpc, false);
2647 out_disable_mux:
2648         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2649                      TYPEC_ORIENTATION_NONE);
2650         return ret;
2651 }
2652
2653 static void tcpm_typec_disconnect(struct tcpm_port *port)
2654 {
2655         if (port->connected) {
2656                 typec_unregister_partner(port->partner);
2657                 port->partner = NULL;
2658                 port->connected = false;
2659         }
2660 }
2661
2662 static void tcpm_unregister_altmodes(struct tcpm_port *port)
2663 {
2664         struct pd_mode_data *modep = &port->mode_data;
2665         int i;
2666
2667         for (i = 0; i < modep->altmodes; i++) {
2668                 typec_unregister_altmode(port->partner_altmode[i]);
2669                 port->partner_altmode[i] = NULL;
2670         }
2671
2672         memset(modep, 0, sizeof(*modep));
2673 }
2674
2675 static void tcpm_reset_port(struct tcpm_port *port)
2676 {
2677         tcpm_unregister_altmodes(port);
2678         tcpm_typec_disconnect(port);
2679         port->attached = false;
2680         port->pd_capable = false;
2681         port->pps_data.supported = false;
2682
2683         /*
2684          * First Rx ID should be 0; set this to a sentinel of -1 so that
2685          * we can check tcpm_pd_rx_handler() if we had seen it before.
2686          */
2687         port->rx_msgid = -1;
2688
2689         port->tcpc->set_pd_rx(port->tcpc, false);
2690         tcpm_init_vbus(port);   /* also disables charging */
2691         tcpm_init_vconn(port);
2692         tcpm_set_current_limit(port, 0, 0);
2693         tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
2694         tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
2695                      TYPEC_ORIENTATION_NONE);
2696         tcpm_set_attached_state(port, false);
2697         port->try_src_count = 0;
2698         port->try_snk_count = 0;
2699         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
2700
2701         power_supply_changed(port->psy);
2702 }
2703
2704 static void tcpm_detach(struct tcpm_port *port)
2705 {
2706         if (!port->attached)
2707                 return;
2708
2709         if (tcpm_port_is_disconnected(port))
2710                 port->hard_reset_count = 0;
2711
2712         tcpm_reset_port(port);
2713 }
2714
2715 static void tcpm_src_detach(struct tcpm_port *port)
2716 {
2717         tcpm_detach(port);
2718 }
2719
2720 static int tcpm_snk_attach(struct tcpm_port *port)
2721 {
2722         int ret;
2723
2724         if (port->attached)
2725                 return 0;
2726
2727         ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
2728                                 TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
2729         if (ret < 0)
2730                 return ret;
2731
2732         ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
2733         if (ret < 0)
2734                 return ret;
2735
2736         port->pd_capable = false;
2737
2738         port->partner = NULL;
2739
2740         port->attached = true;
2741         port->send_discover = true;
2742
2743         return 0;
2744 }
2745
2746 static void tcpm_snk_detach(struct tcpm_port *port)
2747 {
2748         tcpm_detach(port);
2749 }
2750
2751 static int tcpm_acc_attach(struct tcpm_port *port)
2752 {
2753         int ret;
2754
2755         if (port->attached)
2756                 return 0;
2757
2758         ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
2759         if (ret < 0)
2760                 return ret;
2761
2762         port->partner = NULL;
2763
2764         tcpm_typec_connect(port);
2765
2766         port->attached = true;
2767
2768         return 0;
2769 }
2770
2771 static void tcpm_acc_detach(struct tcpm_port *port)
2772 {
2773         tcpm_detach(port);
2774 }
2775
2776 static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
2777 {
2778         if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
2779                 return HARD_RESET_SEND;
2780         if (port->pd_capable)
2781                 return ERROR_RECOVERY;
2782         if (port->pwr_role == TYPEC_SOURCE)
2783                 return SRC_UNATTACHED;
2784         if (port->state == SNK_WAIT_CAPABILITIES)
2785                 return SNK_READY;
2786         return SNK_UNATTACHED;
2787 }
2788
2789 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
2790 {
2791         if (port->port_type == TYPEC_PORT_DRP) {
2792                 if (port->pwr_role == TYPEC_SOURCE)
2793                         return SRC_UNATTACHED;
2794                 else
2795                         return SNK_UNATTACHED;
2796         } else if (port->port_type == TYPEC_PORT_SRC) {
2797                 return SRC_UNATTACHED;
2798         }
2799
2800         return SNK_UNATTACHED;
2801 }
2802
2803 static void tcpm_check_send_discover(struct tcpm_port *port)
2804 {
2805         if (port->data_role == TYPEC_HOST && port->send_discover &&
2806             port->pd_capable) {
2807                 tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
2808                 port->send_discover = false;
2809         }
2810 }
2811
2812 static void tcpm_swap_complete(struct tcpm_port *port, int result)
2813 {
2814         if (port->swap_pending) {
2815                 port->swap_status = result;
2816                 port->swap_pending = false;
2817                 port->non_pd_role_swap = false;
2818                 complete(&port->swap_complete);
2819         }
2820 }
2821
2822 static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
2823 {
2824         switch (cc) {
2825         case TYPEC_CC_RP_1_5:
2826                 return TYPEC_PWR_MODE_1_5A;
2827         case TYPEC_CC_RP_3_0:
2828                 return TYPEC_PWR_MODE_3_0A;
2829         case TYPEC_CC_RP_DEF:
2830         default:
2831                 return TYPEC_PWR_MODE_USB;
2832         }
2833 }
2834
2835 static void run_state_machine(struct tcpm_port *port)
2836 {
2837         int ret;
2838         enum typec_pwr_opmode opmode;
2839         unsigned int msecs;
2840
2841         port->enter_state = port->state;
2842         switch (port->state) {
2843         case DRP_TOGGLING:
2844                 break;
2845         /* SRC states */
2846         case SRC_UNATTACHED:
2847                 if (!port->non_pd_role_swap)
2848                         tcpm_swap_complete(port, -ENOTCONN);
2849                 tcpm_src_detach(port);
2850                 if (tcpm_start_drp_toggling(port, tcpm_rp_cc(port))) {
2851                         tcpm_set_state(port, DRP_TOGGLING, 0);
2852                         break;
2853                 }
2854                 tcpm_set_cc(port, tcpm_rp_cc(port));
2855                 if (port->port_type == TYPEC_PORT_DRP)
2856                         tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
2857                 break;
2858         case SRC_ATTACH_WAIT:
2859                 if (tcpm_port_is_debug(port))
2860                         tcpm_set_state(port, DEBUG_ACC_ATTACHED,
2861                                        PD_T_CC_DEBOUNCE);
2862                 else if (tcpm_port_is_audio(port))
2863                         tcpm_set_state(port, AUDIO_ACC_ATTACHED,
2864                                        PD_T_CC_DEBOUNCE);
2865                 else if (tcpm_port_is_source(port))
2866                         tcpm_set_state(port,
2867                                        tcpm_try_snk(port) ? SNK_TRY
2868                                                           : SRC_ATTACHED,
2869                                        PD_T_CC_DEBOUNCE);
2870                 break;
2871
2872         case SNK_TRY:
2873                 port->try_snk_count++;
2874                 /*
2875                  * Requirements:
2876                  * - Do not drive vconn or vbus
2877                  * - Terminate CC pins (both) to Rd
2878                  * Action:
2879                  * - Wait for tDRPTry (PD_T_DRP_TRY).
2880                  *   Until then, ignore any state changes.
2881                  */
2882                 tcpm_set_cc(port, TYPEC_CC_RD);
2883                 tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
2884                 break;
2885         case SNK_TRY_WAIT:
2886                 if (tcpm_port_is_sink(port)) {
2887                         tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
2888                 } else {
2889                         tcpm_set_state(port, SRC_TRYWAIT, 0);
2890                         port->max_wait = 0;
2891                 }
2892                 break;
2893         case SNK_TRY_WAIT_DEBOUNCE:
2894                 tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
2895                                PD_T_PD_DEBOUNCE);
2896                 break;
2897         case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
2898                 if (port->vbus_present && tcpm_port_is_sink(port)) {
2899                         tcpm_set_state(port, SNK_ATTACHED, 0);
2900                 } else {
2901                         tcpm_set_state(port, SRC_TRYWAIT, 0);
2902                         port->max_wait = 0;
2903                 }
2904                 break;
2905         case SRC_TRYWAIT:
2906                 tcpm_set_cc(port, tcpm_rp_cc(port));
2907                 if (port->max_wait == 0) {
2908                         port->max_wait = jiffies +
2909                                          msecs_to_jiffies(PD_T_DRP_TRY);
2910                         tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2911                                        PD_T_DRP_TRY);
2912                 } else {
2913                         if (time_is_after_jiffies(port->max_wait))
2914                                 tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
2915                                                jiffies_to_msecs(port->max_wait -
2916                                                                 jiffies));
2917                         else
2918                                 tcpm_set_state(port, SNK_UNATTACHED, 0);
2919                 }
2920                 break;
2921         case SRC_TRYWAIT_DEBOUNCE:
2922                 tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
2923                 break;
2924         case SRC_TRYWAIT_UNATTACHED:
2925                 tcpm_set_state(port, SNK_UNATTACHED, 0);
2926                 break;
2927
2928         case SRC_ATTACHED:
2929                 ret = tcpm_src_attach(port);
2930                 tcpm_set_state(port, SRC_UNATTACHED,
2931                                ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
2932                 break;
2933         case SRC_STARTUP:
2934                 opmode =  tcpm_get_pwr_opmode(tcpm_rp_cc(port));
2935                 typec_set_pwr_opmode(port->typec_port, opmode);
2936                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
2937                 port->caps_count = 0;
2938                 port->negotiated_rev = PD_MAX_REV;
2939                 port->message_id = 0;
2940                 port->rx_msgid = -1;
2941                 port->explicit_contract = false;
2942                 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
2943                 break;
2944         case SRC_SEND_CAPABILITIES:
2945                 port->caps_count++;
2946                 if (port->caps_count > PD_N_CAPS_COUNT) {
2947                         tcpm_set_state(port, SRC_READY, 0);
2948                         break;
2949                 }
2950                 ret = tcpm_pd_send_source_caps(port);
2951                 if (ret < 0) {
2952                         tcpm_set_state(port, SRC_SEND_CAPABILITIES,
2953                                        PD_T_SEND_SOURCE_CAP);
2954                 } else {
2955                         /*
2956                          * Per standard, we should clear the reset counter here.
2957                          * However, that can result in state machine hang-ups.
2958                          * Reset it only in READY state to improve stability.
2959                          */
2960                         /* port->hard_reset_count = 0; */
2961                         port->caps_count = 0;
2962                         port->pd_capable = true;
2963                         tcpm_set_state_cond(port, hard_reset_state(port),
2964                                             PD_T_SEND_SOURCE_CAP);
2965                 }
2966                 break;
2967         case SRC_NEGOTIATE_CAPABILITIES:
2968                 ret = tcpm_pd_check_request(port);
2969                 if (ret < 0) {
2970                         tcpm_pd_send_control(port, PD_CTRL_REJECT);
2971                         if (!port->explicit_contract) {
2972                                 tcpm_set_state(port,
2973                                                SRC_WAIT_NEW_CAPABILITIES, 0);
2974                         } else {
2975                                 tcpm_set_state(port, SRC_READY, 0);
2976                         }
2977                 } else {
2978                         tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
2979                         tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
2980                                        PD_T_SRC_TRANSITION);
2981                 }
2982                 break;
2983         case SRC_TRANSITION_SUPPLY:
2984                 /* XXX: regulator_set_voltage(vbus, ...) */
2985                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
2986                 port->explicit_contract = true;
2987                 typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
2988                 port->pwr_opmode = TYPEC_PWR_MODE_PD;
2989                 tcpm_set_state_cond(port, SRC_READY, 0);
2990                 break;
2991         case SRC_READY:
2992 #if 1
2993                 port->hard_reset_count = 0;
2994 #endif
2995                 port->try_src_count = 0;
2996
2997                 tcpm_swap_complete(port, 0);
2998                 tcpm_typec_connect(port);
2999
3000                 tcpm_check_send_discover(port);
3001                 /*
3002                  * 6.3.5
3003                  * Sending ping messages is not necessary if
3004                  * - the source operates at vSafe5V
3005                  * or
3006                  * - The system is not operating in PD mode
3007                  * or
3008                  * - Both partners are connected using a Type-C connector
3009                  *
3010                  * There is no actual need to send PD messages since the local
3011                  * port type-c and the spec does not clearly say whether PD is
3012                  * possible when type-c is connected to Type-A/B
3013                  */
3014                 break;
3015         case SRC_WAIT_NEW_CAPABILITIES:
3016                 /* Nothing to do... */
3017                 break;
3018
3019         /* SNK states */
3020         case SNK_UNATTACHED:
3021                 if (!port->non_pd_role_swap)
3022                         tcpm_swap_complete(port, -ENOTCONN);
3023                 tcpm_pps_complete(port, -ENOTCONN);
3024                 tcpm_snk_detach(port);
3025                 if (tcpm_start_drp_toggling(port, TYPEC_CC_RD)) {
3026                         tcpm_set_state(port, DRP_TOGGLING, 0);
3027                         break;
3028                 }
3029                 tcpm_set_cc(port, TYPEC_CC_RD);
3030                 if (port->port_type == TYPEC_PORT_DRP)
3031                         tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
3032                 break;
3033         case SNK_ATTACH_WAIT:
3034                 if ((port->cc1 == TYPEC_CC_OPEN &&
3035                      port->cc2 != TYPEC_CC_OPEN) ||
3036                     (port->cc1 != TYPEC_CC_OPEN &&
3037                      port->cc2 == TYPEC_CC_OPEN))
3038                         tcpm_set_state(port, SNK_DEBOUNCED,
3039                                        PD_T_CC_DEBOUNCE);
3040                 else if (tcpm_port_is_disconnected(port))
3041                         tcpm_set_state(port, SNK_UNATTACHED,
3042                                        PD_T_PD_DEBOUNCE);
3043                 break;
3044         case SNK_DEBOUNCED:
3045                 if (tcpm_port_is_disconnected(port))
3046                         tcpm_set_state(port, SNK_UNATTACHED,
3047                                        PD_T_PD_DEBOUNCE);
3048                 else if (port->vbus_present)
3049                         tcpm_set_state(port,
3050                                        tcpm_try_src(port) ? SRC_TRY
3051                                                           : SNK_ATTACHED,
3052                                        0);
3053                 else
3054                         /* Wait for VBUS, but not forever */
3055                         tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
3056                 break;
3057
3058         case SRC_TRY:
3059                 port->try_src_count++;
3060                 tcpm_set_cc(port, tcpm_rp_cc(port));
3061                 port->max_wait = 0;
3062                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3063                 break;
3064         case SRC_TRY_WAIT:
3065                 if (port->max_wait == 0) {
3066                         port->max_wait = jiffies +
3067                                          msecs_to_jiffies(PD_T_DRP_TRY);
3068                         msecs = PD_T_DRP_TRY;
3069                 } else {
3070                         if (time_is_after_jiffies(port->max_wait))
3071                                 msecs = jiffies_to_msecs(port->max_wait -
3072                                                          jiffies);
3073                         else
3074                                 msecs = 0;
3075                 }
3076                 tcpm_set_state(port, SNK_TRYWAIT, msecs);
3077                 break;
3078         case SRC_TRY_DEBOUNCE:
3079                 tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
3080                 break;
3081         case SNK_TRYWAIT:
3082                 tcpm_set_cc(port, TYPEC_CC_RD);
3083                 tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
3084                 break;
3085         case SNK_TRYWAIT_VBUS:
3086                 /*
3087                  * TCPM stays in this state indefinitely until VBUS
3088                  * is detected as long as Rp is not detected for
3089                  * more than a time period of tPDDebounce.
3090                  */
3091                 if (port->vbus_present && tcpm_port_is_sink(port)) {
3092                         tcpm_set_state(port, SNK_ATTACHED, 0);
3093                         break;
3094                 }
3095                 if (!tcpm_port_is_sink(port))
3096                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3097                 break;
3098         case SNK_TRYWAIT_DEBOUNCE:
3099                 tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
3100                 break;
3101         case SNK_ATTACHED:
3102                 ret = tcpm_snk_attach(port);
3103                 if (ret < 0)
3104                         tcpm_set_state(port, SNK_UNATTACHED, 0);
3105                 else
3106                         tcpm_set_state(port, SNK_STARTUP, 0);
3107                 break;
3108         case SNK_STARTUP:
3109                 opmode =  tcpm_get_pwr_opmode(port->polarity ?
3110                                               port->cc2 : port->cc1);
3111                 typec_set_pwr_opmode(port->typec_port, opmode);
3112                 port->pwr_opmode = TYPEC_PWR_MODE_USB;
3113                 port->negotiated_rev = PD_MAX_REV;
3114                 port->message_id = 0;
3115                 port->rx_msgid = -1;
3116                 port->explicit_contract = false;
3117                 tcpm_set_state(port, SNK_DISCOVERY, 0);
3118                 break;
3119         case SNK_DISCOVERY:
3120                 if (port->vbus_present) {
3121                         tcpm_set_current_limit(port,
3122                                                tcpm_get_current_limit(port),
3123                                                5000);
3124                         tcpm_set_charge(port, true);
3125                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3126                         break;
3127                 }
3128                 /*
3129                  * For DRP, timeouts differ. Also, handling is supposed to be
3130                  * different and much more complex (dead battery detection;
3131                  * see USB power delivery specification, section 8.3.3.6.1.5.1).
3132                  */
3133                 tcpm_set_state(port, hard_reset_state(port),
3134                                port->port_type == TYPEC_PORT_DRP ?
3135                                         PD_T_DB_DETECT : PD_T_NO_RESPONSE);
3136                 break;
3137         case SNK_DISCOVERY_DEBOUNCE:
3138                 tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
3139                                PD_T_CC_DEBOUNCE);
3140                 break;
3141         case SNK_DISCOVERY_DEBOUNCE_DONE:
3142                 if (!tcpm_port_is_disconnected(port) &&
3143                     tcpm_port_is_sink(port) &&
3144                     time_is_after_jiffies(port->delayed_runtime)) {
3145                         tcpm_set_state(port, SNK_DISCOVERY,
3146                                        jiffies_to_msecs(port->delayed_runtime -
3147                                                         jiffies));
3148                         break;
3149                 }
3150                 tcpm_set_state(port, unattached_state(port), 0);
3151                 break;
3152         case SNK_WAIT_CAPABILITIES:
3153                 ret = port->tcpc->set_pd_rx(port->tcpc, true);
3154                 if (ret < 0) {
3155                         tcpm_set_state(port, SNK_READY, 0);
3156                         break;
3157                 }
3158                 /*
3159                  * If VBUS has never been low, and we time out waiting
3160                  * for source cap, try a soft reset first, in case we
3161                  * were already in a stable contract before this boot.
3162                  * Do this only once.
3163                  */
3164                 if (port->vbus_never_low) {
3165                         port->vbus_never_low = false;
3166                         tcpm_set_state(port, SOFT_RESET_SEND,
3167                                        PD_T_SINK_WAIT_CAP);
3168                 } else {
3169                         tcpm_set_state(port, hard_reset_state(port),
3170                                        PD_T_SINK_WAIT_CAP);
3171                 }
3172                 break;
3173         case SNK_NEGOTIATE_CAPABILITIES:
3174                 port->pd_capable = true;
3175                 port->hard_reset_count = 0;
3176                 ret = tcpm_pd_send_request(port);
3177                 if (ret < 0) {
3178                         /* Let the Source send capabilities again. */
3179                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3180                 } else {
3181                         tcpm_set_state_cond(port, hard_reset_state(port),
3182                                             PD_T_SENDER_RESPONSE);
3183                 }
3184                 break;
3185         case SNK_NEGOTIATE_PPS_CAPABILITIES:
3186                 ret = tcpm_pd_send_pps_request(port);
3187                 if (ret < 0) {
3188                         port->pps_status = ret;
3189                         /*
3190                          * If this was called due to updates to sink
3191                          * capabilities, and pps is no longer valid, we should
3192                          * safely fall back to a standard PDO.
3193                          */
3194                         if (port->update_sink_caps)
3195                                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
3196                         else
3197                                 tcpm_set_state(port, SNK_READY, 0);
3198                 } else {
3199                         tcpm_set_state_cond(port, hard_reset_state(port),
3200                                             PD_T_SENDER_RESPONSE);
3201                 }
3202                 break;
3203         case SNK_TRANSITION_SINK:
3204         case SNK_TRANSITION_SINK_VBUS:
3205                 tcpm_set_state(port, hard_reset_state(port),
3206                                PD_T_PS_TRANSITION);
3207                 break;
3208         case SNK_READY:
3209                 port->try_snk_count = 0;
3210                 port->update_sink_caps = false;
3211                 if (port->explicit_contract) {
3212                         typec_set_pwr_opmode(port->typec_port,
3213                                              TYPEC_PWR_MODE_PD);
3214                         port->pwr_opmode = TYPEC_PWR_MODE_PD;
3215                 }
3216
3217                 tcpm_swap_complete(port, 0);
3218                 tcpm_typec_connect(port);
3219                 tcpm_check_send_discover(port);
3220                 tcpm_pps_complete(port, port->pps_status);
3221
3222                 power_supply_changed(port->psy);
3223
3224                 break;
3225
3226         /* Accessory states */
3227         case ACC_UNATTACHED:
3228                 tcpm_acc_detach(port);
3229                 tcpm_set_state(port, SRC_UNATTACHED, 0);
3230                 break;
3231         case DEBUG_ACC_ATTACHED:
3232         case AUDIO_ACC_ATTACHED:
3233                 ret = tcpm_acc_attach(port);
3234                 if (ret < 0)
3235                         tcpm_set_state(port, ACC_UNATTACHED, 0);
3236                 break;
3237         case AUDIO_ACC_DEBOUNCE:
3238                 tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
3239                 break;
3240
3241         /* Hard_Reset states */
3242         case HARD_RESET_SEND:
3243                 tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
3244                 tcpm_set_state(port, HARD_RESET_START, 0);
3245                 break;
3246         case HARD_RESET_START:
3247                 port->hard_reset_count++;
3248                 port->tcpc->set_pd_rx(port->tcpc, false);
3249                 tcpm_unregister_altmodes(port);
3250                 port->send_discover = true;
3251                 if (port->pwr_role == TYPEC_SOURCE)
3252                         tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
3253                                        PD_T_PS_HARD_RESET);
3254                 else
3255                         tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
3256                 break;
3257         case SRC_HARD_RESET_VBUS_OFF:
3258                 tcpm_set_vconn(port, true);
3259                 tcpm_set_vbus(port, false);
3260                 tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
3261                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
3262                 break;
3263         case SRC_HARD_RESET_VBUS_ON:
3264                 tcpm_set_vbus(port, true);
3265                 port->tcpc->set_pd_rx(port->tcpc, true);
3266                 tcpm_set_attached_state(port, true);
3267                 tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
3268                 break;
3269         case SNK_HARD_RESET_SINK_OFF:
3270                 memset(&port->pps_data, 0, sizeof(port->pps_data));
3271                 tcpm_set_vconn(port, false);
3272                 tcpm_set_charge(port, false);
3273                 tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
3274                 /*
3275                  * VBUS may or may not toggle, depending on the adapter.
3276                  * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
3277                  * directly after timeout.
3278                  */
3279                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
3280                 break;
3281         case SNK_HARD_RESET_WAIT_VBUS:
3282                 /* Assume we're disconnected if VBUS doesn't come back. */
3283                 tcpm_set_state(port, SNK_UNATTACHED,
3284                                PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
3285                 break;
3286         case SNK_HARD_RESET_SINK_ON:
3287                 /* Note: There is no guarantee that VBUS is on in this state */
3288                 /*
3289                  * XXX:
3290                  * The specification suggests that dual mode ports in sink
3291                  * mode should transition to state PE_SRC_Transition_to_default.
3292                  * See USB power delivery specification chapter 8.3.3.6.1.3.
3293                  * This would mean to to
3294                  * - turn off VCONN, reset power supply
3295                  * - request hardware reset
3296                  * - turn on VCONN
3297                  * - Transition to state PE_Src_Startup
3298                  * SNK only ports shall transition to state Snk_Startup
3299                  * (see chapter 8.3.3.3.8).
3300                  * Similar, dual-mode ports in source mode should transition
3301                  * to PE_SNK_Transition_to_default.
3302                  */
3303                 tcpm_set_attached_state(port, true);
3304                 tcpm_set_state(port, SNK_STARTUP, 0);
3305                 break;
3306
3307         /* Soft_Reset states */
3308         case SOFT_RESET:
3309                 port->message_id = 0;
3310                 port->rx_msgid = -1;
3311                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3312                 if (port->pwr_role == TYPEC_SOURCE)
3313                         tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
3314                 else
3315                         tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
3316                 break;
3317         case SOFT_RESET_SEND:
3318                 port->message_id = 0;
3319                 port->rx_msgid = -1;
3320                 if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
3321                         tcpm_set_state_cond(port, hard_reset_state(port), 0);
3322                 else
3323                         tcpm_set_state_cond(port, hard_reset_state(port),
3324                                             PD_T_SENDER_RESPONSE);
3325                 break;
3326
3327         /* DR_Swap states */
3328         case DR_SWAP_SEND:
3329                 tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
3330                 tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
3331                                     PD_T_SENDER_RESPONSE);
3332                 break;
3333         case DR_SWAP_ACCEPT:
3334                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3335                 tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
3336                 break;
3337         case DR_SWAP_SEND_TIMEOUT:
3338                 tcpm_swap_complete(port, -ETIMEDOUT);
3339                 tcpm_set_state(port, ready_state(port), 0);
3340                 break;
3341         case DR_SWAP_CHANGE_DR:
3342                 if (port->data_role == TYPEC_HOST) {
3343                         tcpm_unregister_altmodes(port);
3344                         tcpm_set_roles(port, true, port->pwr_role,
3345                                        TYPEC_DEVICE);
3346                 } else {
3347                         tcpm_set_roles(port, true, port->pwr_role,
3348                                        TYPEC_HOST);
3349                         port->send_discover = true;
3350                 }
3351                 tcpm_set_state(port, ready_state(port), 0);
3352                 break;
3353
3354         /* PR_Swap states */
3355         case PR_SWAP_ACCEPT:
3356                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3357                 tcpm_set_state(port, PR_SWAP_START, 0);
3358                 break;
3359         case PR_SWAP_SEND:
3360                 tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
3361                 tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
3362                                     PD_T_SENDER_RESPONSE);
3363                 break;
3364         case PR_SWAP_SEND_TIMEOUT:
3365                 tcpm_swap_complete(port, -ETIMEDOUT);
3366                 tcpm_set_state(port, ready_state(port), 0);
3367                 break;
3368         case PR_SWAP_START:
3369                 if (port->pwr_role == TYPEC_SOURCE)
3370                         tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
3371                                        PD_T_SRC_TRANSITION);
3372                 else
3373                         tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
3374                 break;
3375         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3376                 tcpm_set_vbus(port, false);
3377                 port->explicit_contract = false;
3378                 /* allow time for Vbus discharge, must be < tSrcSwapStdby */
3379                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
3380                                PD_T_SRCSWAPSTDBY);
3381                 break;
3382         case PR_SWAP_SRC_SNK_SOURCE_OFF:
3383                 tcpm_set_cc(port, TYPEC_CC_RD);
3384                 /* allow CC debounce */
3385                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
3386                                PD_T_CC_DEBOUNCE);
3387                 break;
3388         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3389                 /*
3390                  * USB-PD standard, 6.2.1.4, Port Power Role:
3391                  * "During the Power Role Swap Sequence, for the initial Source
3392                  * Port, the Port Power Role field shall be set to Sink in the
3393                  * PS_RDY Message indicating that the initial Source’s power
3394                  * supply is turned off"
3395                  */
3396                 tcpm_set_pwr_role(port, TYPEC_SINK);
3397                 if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
3398                         tcpm_set_state(port, ERROR_RECOVERY, 0);
3399                         break;
3400                 }
3401                 tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
3402                 break;
3403         case PR_SWAP_SRC_SNK_SINK_ON:
3404                 tcpm_set_state(port, SNK_STARTUP, 0);
3405                 break;
3406         case PR_SWAP_SNK_SRC_SINK_OFF:
3407                 tcpm_set_charge(port, false);
3408                 tcpm_set_state(port, hard_reset_state(port),
3409                                PD_T_PS_SOURCE_OFF);
3410                 break;
3411         case PR_SWAP_SNK_SRC_SOURCE_ON:
3412                 tcpm_set_cc(port, tcpm_rp_cc(port));
3413                 tcpm_set_vbus(port, true);
3414                 /*
3415                  * allow time VBUS ramp-up, must be < tNewSrc
3416                  * Also, this window overlaps with CC debounce as well.
3417                  * So, Wait for the max of two which is PD_T_NEWSRC
3418                  */
3419                 tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
3420                                PD_T_NEWSRC);
3421                 break;
3422         case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
3423                 /*
3424                  * USB PD standard, 6.2.1.4:
3425                  * "Subsequent Messages initiated by the Policy Engine,
3426                  * such as the PS_RDY Message sent to indicate that Vbus
3427                  * is ready, will have the Port Power Role field set to
3428                  * Source."
3429                  */
3430                 tcpm_set_pwr_role(port, TYPEC_SOURCE);
3431                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3432                 tcpm_set_state(port, SRC_STARTUP, 0);
3433                 break;
3434
3435         case VCONN_SWAP_ACCEPT:
3436                 tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
3437                 tcpm_set_state(port, VCONN_SWAP_START, 0);
3438                 break;
3439         case VCONN_SWAP_SEND:
3440                 tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
3441                 tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
3442                                PD_T_SENDER_RESPONSE);
3443                 break;
3444         case VCONN_SWAP_SEND_TIMEOUT:
3445                 tcpm_swap_complete(port, -ETIMEDOUT);
3446                 tcpm_set_state(port, ready_state(port), 0);
3447                 break;
3448         case VCONN_SWAP_START:
3449                 if (port->vconn_role == TYPEC_SOURCE)
3450                         tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
3451                 else
3452                         tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
3453                 break;
3454         case VCONN_SWAP_WAIT_FOR_VCONN:
3455                 tcpm_set_state(port, hard_reset_state(port),
3456                                PD_T_VCONN_SOURCE_ON);
3457                 break;
3458         case VCONN_SWAP_TURN_ON_VCONN:
3459                 tcpm_set_vconn(port, true);
3460                 tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
3461                 tcpm_set_state(port, ready_state(port), 0);
3462                 break;
3463         case VCONN_SWAP_TURN_OFF_VCONN:
3464                 tcpm_set_vconn(port, false);
3465                 tcpm_set_state(port, ready_state(port), 0);
3466                 break;
3467
3468         case DR_SWAP_CANCEL:
3469         case PR_SWAP_CANCEL:
3470         case VCONN_SWAP_CANCEL:
3471                 tcpm_swap_complete(port, port->swap_status);
3472                 if (port->pwr_role == TYPEC_SOURCE)
3473                         tcpm_set_state(port, SRC_READY, 0);
3474                 else
3475                         tcpm_set_state(port, SNK_READY, 0);
3476                 break;
3477
3478         case BIST_RX:
3479                 switch (BDO_MODE_MASK(port->bist_request)) {
3480                 case BDO_MODE_CARRIER2:
3481                         tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
3482                         break;
3483                 default:
3484                         break;
3485                 }
3486                 /* Always switch to unattached state */
3487                 tcpm_set_state(port, unattached_state(port), 0);
3488                 break;
3489         case GET_STATUS_SEND:
3490                 tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
3491                 tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
3492                                PD_T_SENDER_RESPONSE);
3493                 break;
3494         case GET_STATUS_SEND_TIMEOUT:
3495                 tcpm_set_state(port, ready_state(port), 0);
3496                 break;
3497         case GET_PPS_STATUS_SEND:
3498                 tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
3499                 tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
3500                                PD_T_SENDER_RESPONSE);
3501                 break;
3502         case GET_PPS_STATUS_SEND_TIMEOUT:
3503                 tcpm_set_state(port, ready_state(port), 0);
3504                 break;
3505         case ERROR_RECOVERY:
3506                 tcpm_swap_complete(port, -EPROTO);
3507                 tcpm_pps_complete(port, -EPROTO);
3508                 tcpm_set_state(port, PORT_RESET, 0);
3509                 break;
3510         case PORT_RESET:
3511                 tcpm_reset_port(port);
3512                 tcpm_set_cc(port, TYPEC_CC_OPEN);
3513                 tcpm_set_state(port, PORT_RESET_WAIT_OFF,
3514                                PD_T_ERROR_RECOVERY);
3515                 break;
3516         case PORT_RESET_WAIT_OFF:
3517                 tcpm_set_state(port,
3518                                tcpm_default_state(port),
3519                                port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
3520                 break;
3521         default:
3522                 WARN(1, "Unexpected port state %d\n", port->state);
3523                 break;
3524         }
3525 }
3526
3527 static void tcpm_state_machine_work(struct work_struct *work)
3528 {
3529         struct tcpm_port *port = container_of(work, struct tcpm_port,
3530                                               state_machine.work);
3531         enum tcpm_state prev_state;
3532
3533         mutex_lock(&port->lock);
3534         port->state_machine_running = true;
3535
3536         if (port->queued_message && tcpm_send_queued_message(port))
3537                 goto done;
3538
3539         /* If we were queued due to a delayed state change, update it now */
3540         if (port->delayed_state) {
3541                 tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
3542                          tcpm_states[port->state],
3543                          tcpm_states[port->delayed_state], port->delay_ms);
3544                 port->prev_state = port->state;
3545                 port->state = port->delayed_state;
3546                 port->delayed_state = INVALID_STATE;
3547         }
3548
3549         /*
3550          * Continue running as long as we have (non-delayed) state changes
3551          * to make.
3552          */
3553         do {
3554                 prev_state = port->state;
3555                 run_state_machine(port);
3556                 if (port->queued_message)
3557                         tcpm_send_queued_message(port);
3558         } while (port->state != prev_state && !port->delayed_state);
3559
3560 done:
3561         port->state_machine_running = false;
3562         mutex_unlock(&port->lock);
3563 }
3564
3565 static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
3566                             enum typec_cc_status cc2)
3567 {
3568         enum typec_cc_status old_cc1, old_cc2;
3569         enum tcpm_state new_state;
3570
3571         old_cc1 = port->cc1;
3572         old_cc2 = port->cc2;
3573         port->cc1 = cc1;
3574         port->cc2 = cc2;
3575
3576         tcpm_log_force(port,
3577                        "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
3578                        old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
3579                        port->polarity,
3580                        tcpm_port_is_disconnected(port) ? "disconnected"
3581                                                        : "connected");
3582
3583         switch (port->state) {
3584         case DRP_TOGGLING:
3585                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3586                     tcpm_port_is_source(port))
3587                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3588                 else if (tcpm_port_is_sink(port))
3589                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3590                 break;
3591         case SRC_UNATTACHED:
3592         case ACC_UNATTACHED:
3593                 if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
3594                     tcpm_port_is_source(port))
3595                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3596                 break;
3597         case SRC_ATTACH_WAIT:
3598                 if (tcpm_port_is_disconnected(port) ||
3599                     tcpm_port_is_audio_detached(port))
3600                         tcpm_set_state(port, SRC_UNATTACHED, 0);
3601                 else if (cc1 != old_cc1 || cc2 != old_cc2)
3602                         tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
3603                 break;
3604         case SRC_ATTACHED:
3605         case SRC_SEND_CAPABILITIES:
3606         case SRC_READY:
3607                 if (tcpm_port_is_disconnected(port) ||
3608                     !tcpm_port_is_source(port))
3609                         tcpm_set_state(port, SRC_UNATTACHED, 0);
3610                 break;
3611         case SNK_UNATTACHED:
3612                 if (tcpm_port_is_sink(port))
3613                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3614                 break;
3615         case SNK_ATTACH_WAIT:
3616                 if ((port->cc1 == TYPEC_CC_OPEN &&
3617                      port->cc2 != TYPEC_CC_OPEN) ||
3618                     (port->cc1 != TYPEC_CC_OPEN &&
3619                      port->cc2 == TYPEC_CC_OPEN))
3620                         new_state = SNK_DEBOUNCED;
3621                 else if (tcpm_port_is_disconnected(port))
3622                         new_state = SNK_UNATTACHED;
3623                 else
3624                         break;
3625                 if (new_state != port->delayed_state)
3626                         tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
3627                 break;
3628         case SNK_DEBOUNCED:
3629                 if (tcpm_port_is_disconnected(port))
3630                         new_state = SNK_UNATTACHED;
3631                 else if (port->vbus_present)
3632                         new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
3633                 else
3634                         new_state = SNK_UNATTACHED;
3635                 if (new_state != port->delayed_state)
3636                         tcpm_set_state(port, SNK_DEBOUNCED, 0);
3637                 break;
3638         case SNK_READY:
3639                 if (tcpm_port_is_disconnected(port))
3640                         tcpm_set_state(port, unattached_state(port), 0);
3641                 else if (!port->pd_capable &&
3642                          (cc1 != old_cc1 || cc2 != old_cc2))
3643                         tcpm_set_current_limit(port,
3644                                                tcpm_get_current_limit(port),
3645                                                5000);
3646                 break;
3647
3648         case AUDIO_ACC_ATTACHED:
3649                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3650                         tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
3651                 break;
3652         case AUDIO_ACC_DEBOUNCE:
3653                 if (tcpm_port_is_audio(port))
3654                         tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
3655                 break;
3656
3657         case DEBUG_ACC_ATTACHED:
3658                 if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
3659                         tcpm_set_state(port, ACC_UNATTACHED, 0);
3660                 break;
3661
3662         case SNK_TRY:
3663                 /* Do nothing, waiting for timeout */
3664                 break;
3665
3666         case SNK_DISCOVERY:
3667                 /* CC line is unstable, wait for debounce */
3668                 if (tcpm_port_is_disconnected(port))
3669                         tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
3670                 break;
3671         case SNK_DISCOVERY_DEBOUNCE:
3672                 break;
3673
3674         case SRC_TRYWAIT:
3675                 /* Hand over to state machine if needed */
3676                 if (!port->vbus_present && tcpm_port_is_source(port))
3677                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3678                 break;
3679         case SRC_TRYWAIT_DEBOUNCE:
3680                 if (port->vbus_present || !tcpm_port_is_source(port))
3681                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3682                 break;
3683         case SNK_TRY_WAIT_DEBOUNCE:
3684                 if (!tcpm_port_is_sink(port)) {
3685                         port->max_wait = 0;
3686                         tcpm_set_state(port, SRC_TRYWAIT, 0);
3687                 }
3688                 break;
3689         case SRC_TRY_WAIT:
3690                 if (tcpm_port_is_source(port))
3691                         tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
3692                 break;
3693         case SRC_TRY_DEBOUNCE:
3694                 tcpm_set_state(port, SRC_TRY_WAIT, 0);
3695                 break;
3696         case SNK_TRYWAIT_DEBOUNCE:
3697                 if (tcpm_port_is_sink(port))
3698                         tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
3699                 break;
3700         case SNK_TRYWAIT_VBUS:
3701                 if (!tcpm_port_is_sink(port))
3702                         tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
3703                 break;
3704         case SNK_TRYWAIT:
3705                 /* Do nothing, waiting for tCCDebounce */
3706                 break;
3707         case PR_SWAP_SNK_SRC_SINK_OFF:
3708         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3709         case PR_SWAP_SRC_SNK_SOURCE_OFF:
3710         case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
3711         case PR_SWAP_SNK_SRC_SOURCE_ON:
3712                 /*
3713                  * CC state change is expected in PR_SWAP
3714                  * Ignore it.
3715                  */
3716                 break;
3717
3718         default:
3719                 if (tcpm_port_is_disconnected(port))
3720                         tcpm_set_state(port, unattached_state(port), 0);
3721                 break;
3722         }
3723 }
3724
3725 static void _tcpm_pd_vbus_on(struct tcpm_port *port)
3726 {
3727         tcpm_log_force(port, "VBUS on");
3728         port->vbus_present = true;
3729         switch (port->state) {
3730         case SNK_TRANSITION_SINK_VBUS:
3731                 port->explicit_contract = true;
3732                 tcpm_set_state(port, SNK_READY, 0);
3733                 break;
3734         case SNK_DISCOVERY:
3735                 tcpm_set_state(port, SNK_DISCOVERY, 0);
3736                 break;
3737
3738         case SNK_DEBOUNCED:
3739                 tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
3740                                                         : SNK_ATTACHED,
3741                                        0);
3742                 break;
3743         case SNK_HARD_RESET_WAIT_VBUS:
3744                 tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
3745                 break;
3746         case SRC_ATTACHED:
3747                 tcpm_set_state(port, SRC_STARTUP, 0);
3748                 break;
3749         case SRC_HARD_RESET_VBUS_ON:
3750                 tcpm_set_state(port, SRC_STARTUP, 0);
3751                 break;
3752
3753         case SNK_TRY:
3754                 /* Do nothing, waiting for timeout */
3755                 break;
3756         case SRC_TRYWAIT:
3757                 /* Do nothing, Waiting for Rd to be detected */
3758                 break;
3759         case SRC_TRYWAIT_DEBOUNCE:
3760                 tcpm_set_state(port, SRC_TRYWAIT, 0);
3761                 break;
3762         case SNK_TRY_WAIT_DEBOUNCE:
3763                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3764                 break;
3765         case SNK_TRYWAIT:
3766                 /* Do nothing, waiting for tCCDebounce */
3767                 break;
3768         case SNK_TRYWAIT_VBUS:
3769                 if (tcpm_port_is_sink(port))
3770                         tcpm_set_state(port, SNK_ATTACHED, 0);
3771                 break;
3772         case SNK_TRYWAIT_DEBOUNCE:
3773                 /* Do nothing, waiting for Rp */
3774                 break;
3775         case SRC_TRY_WAIT:
3776         case SRC_TRY_DEBOUNCE:
3777                 /* Do nothing, waiting for sink detection */
3778                 break;
3779         default:
3780                 break;
3781         }
3782 }
3783
3784 static void _tcpm_pd_vbus_off(struct tcpm_port *port)
3785 {
3786         tcpm_log_force(port, "VBUS off");
3787         port->vbus_present = false;
3788         port->vbus_never_low = false;
3789         switch (port->state) {
3790         case SNK_HARD_RESET_SINK_OFF:
3791                 tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
3792                 break;
3793         case SRC_HARD_RESET_VBUS_OFF:
3794                 tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
3795                 break;
3796         case HARD_RESET_SEND:
3797                 break;
3798
3799         case SNK_TRY:
3800                 /* Do nothing, waiting for timeout */
3801                 break;
3802         case SRC_TRYWAIT:
3803                 /* Hand over to state machine if needed */
3804                 if (tcpm_port_is_source(port))
3805                         tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
3806                 break;
3807         case SNK_TRY_WAIT_DEBOUNCE:
3808                 /* Do nothing, waiting for PD_DEBOUNCE to do be done */
3809                 break;
3810         case SNK_TRYWAIT:
3811         case SNK_TRYWAIT_VBUS:
3812         case SNK_TRYWAIT_DEBOUNCE:
3813                 break;
3814         case SNK_ATTACH_WAIT:
3815                 tcpm_set_state(port, SNK_UNATTACHED, 0);
3816                 break;
3817
3818         case SNK_NEGOTIATE_CAPABILITIES:
3819                 break;
3820
3821         case PR_SWAP_SRC_SNK_TRANSITION_OFF:
3822                 tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
3823                 break;
3824
3825         case PR_SWAP_SNK_SRC_SINK_OFF:
3826                 /* Do nothing, expected */
3827                 break;
3828
3829         case PORT_RESET_WAIT_OFF:
3830                 tcpm_set_state(port, tcpm_default_state(port), 0);
3831                 break;
3832         case SRC_TRY_WAIT:
3833         case SRC_TRY_DEBOUNCE:
3834                 /* Do nothing, waiting for sink detection */
3835                 break;
3836         default:
3837                 if (port->pwr_role == TYPEC_SINK &&
3838                     port->attached)
3839                         tcpm_set_state(port, SNK_UNATTACHED, 0);
3840                 break;
3841         }
3842 }
3843
3844 static void _tcpm_pd_hard_reset(struct tcpm_port *port)
3845 {
3846         tcpm_log_force(port, "Received hard reset");
3847         /*
3848          * If we keep receiving hard reset requests, executing the hard reset
3849          * must have failed. Revert to error recovery if that happens.
3850          */
3851         tcpm_set_state(port,
3852                        port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
3853                                 HARD_RESET_START : ERROR_RECOVERY,
3854                        0);
3855 }
3856
3857 static void tcpm_pd_event_handler(struct work_struct *work)
3858 {
3859         struct tcpm_port *port = container_of(work, struct tcpm_port,
3860                                               event_work);
3861         u32 events;
3862
3863         mutex_lock(&port->lock);
3864
3865         spin_lock(&port->pd_event_lock);
3866         while (port->pd_events) {
3867                 events = port->pd_events;
3868                 port->pd_events = 0;
3869                 spin_unlock(&port->pd_event_lock);
3870                 if (events & TCPM_RESET_EVENT)
3871                         _tcpm_pd_hard_reset(port);
3872                 if (events & TCPM_VBUS_EVENT) {
3873                         bool vbus;
3874
3875                         vbus = port->tcpc->get_vbus(port->tcpc);
3876                         if (vbus)
3877                                 _tcpm_pd_vbus_on(port);
3878                         else
3879                                 _tcpm_pd_vbus_off(port);
3880                 }
3881                 if (events & TCPM_CC_EVENT) {
3882                         enum typec_cc_status cc1, cc2;
3883
3884                         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
3885                                 _tcpm_cc_change(port, cc1, cc2);
3886                 }
3887                 spin_lock(&port->pd_event_lock);
3888         }
3889         spin_unlock(&port->pd_event_lock);
3890         mutex_unlock(&port->lock);
3891 }
3892
3893 void tcpm_cc_change(struct tcpm_port *port)
3894 {
3895         spin_lock(&port->pd_event_lock);
3896         port->pd_events |= TCPM_CC_EVENT;
3897         spin_unlock(&port->pd_event_lock);
3898         queue_work(port->wq, &port->event_work);
3899 }
3900 EXPORT_SYMBOL_GPL(tcpm_cc_change);
3901
3902 void tcpm_vbus_change(struct tcpm_port *port)
3903 {
3904         spin_lock(&port->pd_event_lock);
3905         port->pd_events |= TCPM_VBUS_EVENT;
3906         spin_unlock(&port->pd_event_lock);
3907         queue_work(port->wq, &port->event_work);
3908 }
3909 EXPORT_SYMBOL_GPL(tcpm_vbus_change);
3910
3911 void tcpm_pd_hard_reset(struct tcpm_port *port)
3912 {
3913         spin_lock(&port->pd_event_lock);
3914         port->pd_events = TCPM_RESET_EVENT;
3915         spin_unlock(&port->pd_event_lock);
3916         queue_work(port->wq, &port->event_work);
3917 }
3918 EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
3919
3920 static int tcpm_dr_set(const struct typec_capability *cap,
3921                        enum typec_data_role data)
3922 {
3923         struct tcpm_port *port = typec_cap_to_tcpm(cap);
3924         int ret;
3925
3926         mutex_lock(&port->swap_lock);
3927         mutex_lock(&port->lock);
3928
3929         if (port->port_type != TYPEC_PORT_DRP) {
3930                 ret = -EINVAL;
3931                 goto port_unlock;
3932         }
3933         if (port->state != SRC_READY && port->state != SNK_READY) {
3934                 ret = -EAGAIN;
3935                 goto port_unlock;
3936         }
3937
3938         if (port->data_role == data) {
3939                 ret = 0;
3940                 goto port_unlock;
3941         }
3942
3943         /*
3944          * XXX
3945          * 6.3.9: If an alternate mode is active, a request to swap
3946          * alternate modes shall trigger a port reset.
3947          * Reject data role swap request in this case.
3948          */
3949
3950         if (!port->pd_capable) {
3951                 /*
3952                  * If the partner is not PD capable, reset the port to
3953                  * trigger a role change. This can only work if a preferred
3954                  * role is configured, and if it matches the requested role.
3955                  */
3956                 if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
3957                     port->try_role == port->pwr_role) {
3958                         ret = -EINVAL;
3959                         goto port_unlock;
3960                 }
3961                 port->non_pd_role_swap = true;
3962                 tcpm_set_state(port, PORT_RESET, 0);
3963         } else {
3964                 tcpm_set_state(port, DR_SWAP_SEND, 0);
3965         }
3966
3967         port->swap_status = 0;
3968         port->swap_pending = true;
3969         reinit_completion(&port->swap_complete);
3970         mutex_unlock(&port->lock);
3971
3972         if (!wait_for_completion_timeout(&port->swap_complete,
3973                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
3974                 ret = -ETIMEDOUT;
3975         else
3976                 ret = port->swap_status;
3977
3978         port->non_pd_role_swap = false;
3979         goto swap_unlock;
3980
3981 port_unlock:
3982         mutex_unlock(&port->lock);
3983 swap_unlock:
3984         mutex_unlock(&port->swap_lock);
3985         return ret;
3986 }
3987
3988 static int tcpm_pr_set(const struct typec_capability *cap,
3989                        enum typec_role role)
3990 {
3991         struct tcpm_port *port = typec_cap_to_tcpm(cap);
3992         int ret;
3993
3994         mutex_lock(&port->swap_lock);
3995         mutex_lock(&port->lock);
3996
3997         if (port->port_type != TYPEC_PORT_DRP) {
3998                 ret = -EINVAL;
3999                 goto port_unlock;
4000         }
4001         if (port->state != SRC_READY && port->state != SNK_READY) {
4002                 ret = -EAGAIN;
4003                 goto port_unlock;
4004         }
4005
4006         if (role == port->pwr_role) {
4007                 ret = 0;
4008                 goto port_unlock;
4009         }
4010
4011         port->swap_status = 0;
4012         port->swap_pending = true;
4013         reinit_completion(&port->swap_complete);
4014         tcpm_set_state(port, PR_SWAP_SEND, 0);
4015         mutex_unlock(&port->lock);
4016
4017         if (!wait_for_completion_timeout(&port->swap_complete,
4018                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4019                 ret = -ETIMEDOUT;
4020         else
4021                 ret = port->swap_status;
4022
4023         goto swap_unlock;
4024
4025 port_unlock:
4026         mutex_unlock(&port->lock);
4027 swap_unlock:
4028         mutex_unlock(&port->swap_lock);
4029         return ret;
4030 }
4031
4032 static int tcpm_vconn_set(const struct typec_capability *cap,
4033                           enum typec_role role)
4034 {
4035         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4036         int ret;
4037
4038         mutex_lock(&port->swap_lock);
4039         mutex_lock(&port->lock);
4040
4041         if (port->state != SRC_READY && port->state != SNK_READY) {
4042                 ret = -EAGAIN;
4043                 goto port_unlock;
4044         }
4045
4046         if (role == port->vconn_role) {
4047                 ret = 0;
4048                 goto port_unlock;
4049         }
4050
4051         port->swap_status = 0;
4052         port->swap_pending = true;
4053         reinit_completion(&port->swap_complete);
4054         tcpm_set_state(port, VCONN_SWAP_SEND, 0);
4055         mutex_unlock(&port->lock);
4056
4057         if (!wait_for_completion_timeout(&port->swap_complete,
4058                                 msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
4059                 ret = -ETIMEDOUT;
4060         else
4061                 ret = port->swap_status;
4062
4063         goto swap_unlock;
4064
4065 port_unlock:
4066         mutex_unlock(&port->lock);
4067 swap_unlock:
4068         mutex_unlock(&port->swap_lock);
4069         return ret;
4070 }
4071
4072 static int tcpm_try_role(const struct typec_capability *cap, int role)
4073 {
4074         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4075         struct tcpc_dev *tcpc = port->tcpc;
4076         int ret = 0;
4077
4078         mutex_lock(&port->lock);
4079         if (tcpc->try_role)
4080                 ret = tcpc->try_role(tcpc, role);
4081         if (!ret && !tcpc->config->try_role_hw)
4082                 port->try_role = role;
4083         port->try_src_count = 0;
4084         port->try_snk_count = 0;
4085         mutex_unlock(&port->lock);
4086
4087         return ret;
4088 }
4089
4090 static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
4091 {
4092         unsigned int target_mw;
4093         int ret;
4094
4095         mutex_lock(&port->swap_lock);
4096         mutex_lock(&port->lock);
4097
4098         if (!port->pps_data.active) {
4099                 ret = -EOPNOTSUPP;
4100                 goto port_unlock;
4101         }
4102
4103         if (port->state != SNK_READY) {
4104                 ret = -EAGAIN;
4105                 goto port_unlock;
4106         }
4107
4108         if (op_curr > port->pps_data.max_curr) {
4109                 ret = -EINVAL;
4110                 goto port_unlock;
4111         }
4112
4113         target_mw = (op_curr * port->pps_data.out_volt) / 1000;
4114         if (target_mw < port->operating_snk_mw) {
4115                 ret = -EINVAL;
4116                 goto port_unlock;
4117         }
4118
4119         reinit_completion(&port->pps_complete);
4120         port->pps_data.op_curr = op_curr;
4121         port->pps_status = 0;
4122         port->pps_pending = true;
4123         tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4124         mutex_unlock(&port->lock);
4125
4126         if (!wait_for_completion_timeout(&port->pps_complete,
4127                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4128                 ret = -ETIMEDOUT;
4129         else
4130                 ret = port->pps_status;
4131
4132         goto swap_unlock;
4133
4134 port_unlock:
4135         mutex_unlock(&port->lock);
4136 swap_unlock:
4137         mutex_unlock(&port->swap_lock);
4138
4139         return ret;
4140 }
4141
4142 static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
4143 {
4144         unsigned int target_mw;
4145         int ret;
4146
4147         mutex_lock(&port->swap_lock);
4148         mutex_lock(&port->lock);
4149
4150         if (!port->pps_data.active) {
4151                 ret = -EOPNOTSUPP;
4152                 goto port_unlock;
4153         }
4154
4155         if (port->state != SNK_READY) {
4156                 ret = -EAGAIN;
4157                 goto port_unlock;
4158         }
4159
4160         if (out_volt < port->pps_data.min_volt ||
4161             out_volt > port->pps_data.max_volt) {
4162                 ret = -EINVAL;
4163                 goto port_unlock;
4164         }
4165
4166         target_mw = (port->pps_data.op_curr * out_volt) / 1000;
4167         if (target_mw < port->operating_snk_mw) {
4168                 ret = -EINVAL;
4169                 goto port_unlock;
4170         }
4171
4172         reinit_completion(&port->pps_complete);
4173         port->pps_data.out_volt = out_volt;
4174         port->pps_status = 0;
4175         port->pps_pending = true;
4176         tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4177         mutex_unlock(&port->lock);
4178
4179         if (!wait_for_completion_timeout(&port->pps_complete,
4180                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4181                 ret = -ETIMEDOUT;
4182         else
4183                 ret = port->pps_status;
4184
4185         goto swap_unlock;
4186
4187 port_unlock:
4188         mutex_unlock(&port->lock);
4189 swap_unlock:
4190         mutex_unlock(&port->swap_lock);
4191
4192         return ret;
4193 }
4194
4195 static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
4196 {
4197         int ret = 0;
4198
4199         mutex_lock(&port->swap_lock);
4200         mutex_lock(&port->lock);
4201
4202         if (!port->pps_data.supported) {
4203                 ret = -EOPNOTSUPP;
4204                 goto port_unlock;
4205         }
4206
4207         /* Trying to deactivate PPS when already deactivated so just bail */
4208         if (!port->pps_data.active && !activate)
4209                 goto port_unlock;
4210
4211         if (port->state != SNK_READY) {
4212                 ret = -EAGAIN;
4213                 goto port_unlock;
4214         }
4215
4216         reinit_completion(&port->pps_complete);
4217         port->pps_status = 0;
4218         port->pps_pending = true;
4219
4220         /* Trigger PPS request or move back to standard PDO contract */
4221         if (activate) {
4222                 port->pps_data.out_volt = port->supply_voltage;
4223                 port->pps_data.op_curr = port->current_limit;
4224                 tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4225         } else {
4226                 tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4227         }
4228         mutex_unlock(&port->lock);
4229
4230         if (!wait_for_completion_timeout(&port->pps_complete,
4231                                 msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
4232                 ret = -ETIMEDOUT;
4233         else
4234                 ret = port->pps_status;
4235
4236         goto swap_unlock;
4237
4238 port_unlock:
4239         mutex_unlock(&port->lock);
4240 swap_unlock:
4241         mutex_unlock(&port->swap_lock);
4242
4243         return ret;
4244 }
4245
4246 static void tcpm_init(struct tcpm_port *port)
4247 {
4248         enum typec_cc_status cc1, cc2;
4249
4250         port->tcpc->init(port->tcpc);
4251
4252         tcpm_reset_port(port);
4253
4254         /*
4255          * XXX
4256          * Should possibly wait for VBUS to settle if it was enabled locally
4257          * since tcpm_reset_port() will disable VBUS.
4258          */
4259         port->vbus_present = port->tcpc->get_vbus(port->tcpc);
4260         if (port->vbus_present)
4261                 port->vbus_never_low = true;
4262
4263         tcpm_set_state(port, tcpm_default_state(port), 0);
4264
4265         if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
4266                 _tcpm_cc_change(port, cc1, cc2);
4267
4268         /*
4269          * Some adapters need a clean slate at startup, and won't recover
4270          * otherwise. So do not try to be fancy and force a clean disconnect.
4271          */
4272         tcpm_set_state(port, PORT_RESET, 0);
4273 }
4274
4275 static int tcpm_port_type_set(const struct typec_capability *cap,
4276                               enum typec_port_type type)
4277 {
4278         struct tcpm_port *port = typec_cap_to_tcpm(cap);
4279
4280         mutex_lock(&port->lock);
4281         if (type == port->port_type)
4282                 goto port_unlock;
4283
4284         port->port_type = type;
4285
4286         if (!port->connected) {
4287                 tcpm_set_state(port, PORT_RESET, 0);
4288         } else if (type == TYPEC_PORT_SNK) {
4289                 if (!(port->pwr_role == TYPEC_SINK &&
4290                       port->data_role == TYPEC_DEVICE))
4291                         tcpm_set_state(port, PORT_RESET, 0);
4292         } else if (type == TYPEC_PORT_SRC) {
4293                 if (!(port->pwr_role == TYPEC_SOURCE &&
4294                       port->data_role == TYPEC_HOST))
4295                         tcpm_set_state(port, PORT_RESET, 0);
4296         }
4297
4298 port_unlock:
4299         mutex_unlock(&port->lock);
4300         return 0;
4301 }
4302
4303 void tcpm_tcpc_reset(struct tcpm_port *port)
4304 {
4305         mutex_lock(&port->lock);
4306         /* XXX: Maintain PD connection if possible? */
4307         tcpm_init(port);
4308         mutex_unlock(&port->lock);
4309 }
4310 EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
4311
4312 static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
4313                           unsigned int nr_pdo)
4314 {
4315         unsigned int i;
4316
4317         if (nr_pdo > PDO_MAX_OBJECTS)
4318                 nr_pdo = PDO_MAX_OBJECTS;
4319
4320         for (i = 0; i < nr_pdo; i++)
4321                 dest_pdo[i] = src_pdo[i];
4322
4323         return nr_pdo;
4324 }
4325
4326 static int tcpm_copy_vdos(u32 *dest_vdo, const u32 *src_vdo,
4327                           unsigned int nr_vdo)
4328 {
4329         unsigned int i;
4330
4331         if (nr_vdo > VDO_MAX_OBJECTS)
4332                 nr_vdo = VDO_MAX_OBJECTS;
4333
4334         for (i = 0; i < nr_vdo; i++)
4335                 dest_vdo[i] = src_vdo[i];
4336
4337         return nr_vdo;
4338 }
4339
4340 static int tcpm_fw_get_caps(struct tcpm_port *port,
4341                             struct fwnode_handle *fwnode)
4342 {
4343         const char *cap_str;
4344         int ret;
4345         u32 mw;
4346
4347         if (!fwnode)
4348                 return -EINVAL;
4349
4350         /* USB data support is optional */
4351         ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
4352         if (ret == 0) {
4353                 port->typec_caps.data = typec_find_port_data_role(cap_str);
4354                 if (port->typec_caps.data < 0)
4355                         return -EINVAL;
4356         }
4357
4358         ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
4359         if (ret < 0)
4360                 return ret;
4361
4362         port->typec_caps.type = typec_find_port_power_role(cap_str);
4363         if (port->typec_caps.type < 0)
4364                 return -EINVAL;
4365         port->port_type = port->typec_caps.type;
4366
4367         if (port->port_type == TYPEC_PORT_SNK)
4368                 goto sink;
4369
4370         /* Get source pdos */
4371         ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4372                                              NULL, 0);
4373         if (ret <= 0)
4374                 return -EINVAL;
4375
4376         port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
4377         ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
4378                                              port->src_pdo, port->nr_src_pdo);
4379         if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
4380                                             port->nr_src_pdo))
4381                 return -EINVAL;
4382
4383         if (port->port_type == TYPEC_PORT_SRC)
4384                 return 0;
4385
4386         /* Get the preferred power role for DRP */
4387         ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
4388         if (ret < 0)
4389                 return ret;
4390
4391         port->typec_caps.prefer_role = typec_find_power_role(cap_str);
4392         if (port->typec_caps.prefer_role < 0)
4393                 return -EINVAL;
4394 sink:
4395         /* Get sink pdos */
4396         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4397                                              NULL, 0);
4398         if (ret <= 0)
4399                 return -EINVAL;
4400
4401         port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
4402         ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
4403                                              port->snk_pdo, port->nr_snk_pdo);
4404         if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
4405                                             port->nr_snk_pdo))
4406                 return -EINVAL;
4407
4408         if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
4409                 return -EINVAL;
4410         port->operating_snk_mw = mw / 1000;
4411
4412         return 0;
4413 }
4414
4415 int tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
4416                                     unsigned int nr_pdo)
4417 {
4418         if (tcpm_validate_caps(port, pdo, nr_pdo))
4419                 return -EINVAL;
4420
4421         mutex_lock(&port->lock);
4422         port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo);
4423         switch (port->state) {
4424         case SRC_UNATTACHED:
4425         case SRC_ATTACH_WAIT:
4426         case SRC_TRYWAIT:
4427                 tcpm_set_cc(port, tcpm_rp_cc(port));
4428                 break;
4429         case SRC_SEND_CAPABILITIES:
4430         case SRC_NEGOTIATE_CAPABILITIES:
4431         case SRC_READY:
4432         case SRC_WAIT_NEW_CAPABILITIES:
4433                 tcpm_set_cc(port, tcpm_rp_cc(port));
4434                 tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
4435                 break;
4436         default:
4437                 break;
4438         }
4439         mutex_unlock(&port->lock);
4440         return 0;
4441 }
4442 EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities);
4443
4444 int tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
4445                                   unsigned int nr_pdo,
4446                                   unsigned int operating_snk_mw)
4447 {
4448         if (tcpm_validate_caps(port, pdo, nr_pdo))
4449                 return -EINVAL;
4450
4451         mutex_lock(&port->lock);
4452         port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo);
4453         port->operating_snk_mw = operating_snk_mw;
4454         port->update_sink_caps = true;
4455
4456         switch (port->state) {
4457         case SNK_NEGOTIATE_CAPABILITIES:
4458         case SNK_NEGOTIATE_PPS_CAPABILITIES:
4459         case SNK_READY:
4460         case SNK_TRANSITION_SINK:
4461         case SNK_TRANSITION_SINK_VBUS:
4462                 if (port->pps_data.active)
4463                         tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
4464                 else
4465                         tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
4466                 break;
4467         default:
4468                 break;
4469         }
4470         mutex_unlock(&port->lock);
4471         return 0;
4472 }
4473 EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
4474
4475 /* Power Supply access to expose source power information */
4476 enum tcpm_psy_online_states {
4477         TCPM_PSY_OFFLINE = 0,
4478         TCPM_PSY_FIXED_ONLINE,
4479         TCPM_PSY_PROG_ONLINE,
4480 };
4481
4482 static enum power_supply_property tcpm_psy_props[] = {
4483         POWER_SUPPLY_PROP_USB_TYPE,
4484         POWER_SUPPLY_PROP_ONLINE,
4485         POWER_SUPPLY_PROP_VOLTAGE_MIN,
4486         POWER_SUPPLY_PROP_VOLTAGE_MAX,
4487         POWER_SUPPLY_PROP_VOLTAGE_NOW,
4488         POWER_SUPPLY_PROP_CURRENT_MAX,
4489         POWER_SUPPLY_PROP_CURRENT_NOW,
4490 };
4491
4492 static int tcpm_psy_get_online(struct tcpm_port *port,
4493                                union power_supply_propval *val)
4494 {
4495         if (port->vbus_charge) {
4496                 if (port->pps_data.active)
4497                         val->intval = TCPM_PSY_PROG_ONLINE;
4498                 else
4499                         val->intval = TCPM_PSY_FIXED_ONLINE;
4500         } else {
4501                 val->intval = TCPM_PSY_OFFLINE;
4502         }
4503
4504         return 0;
4505 }
4506
4507 static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
4508                                     union power_supply_propval *val)
4509 {
4510         if (port->pps_data.active)
4511                 val->intval = port->pps_data.min_volt * 1000;
4512         else
4513                 val->intval = port->supply_voltage * 1000;
4514
4515         return 0;
4516 }
4517
4518 static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
4519                                     union power_supply_propval *val)
4520 {
4521         if (port->pps_data.active)
4522                 val->intval = port->pps_data.max_volt * 1000;
4523         else
4524                 val->intval = port->supply_voltage * 1000;
4525
4526         return 0;
4527 }
4528
4529 static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
4530                                     union power_supply_propval *val)
4531 {
4532         val->intval = port->supply_voltage * 1000;
4533
4534         return 0;
4535 }
4536
4537 static int tcpm_psy_get_current_max(struct tcpm_port *port,
4538                                     union power_supply_propval *val)
4539 {
4540         if (port->pps_data.active)
4541                 val->intval = port->pps_data.max_curr * 1000;
4542         else
4543                 val->intval = port->current_limit * 1000;
4544
4545         return 0;
4546 }
4547
4548 static int tcpm_psy_get_current_now(struct tcpm_port *port,
4549                                     union power_supply_propval *val)
4550 {
4551         val->intval = port->current_limit * 1000;
4552
4553         return 0;
4554 }
4555
4556 static int tcpm_psy_get_prop(struct power_supply *psy,
4557                              enum power_supply_property psp,
4558                              union power_supply_propval *val)
4559 {
4560         struct tcpm_port *port = power_supply_get_drvdata(psy);
4561         int ret = 0;
4562
4563         switch (psp) {
4564         case POWER_SUPPLY_PROP_USB_TYPE:
4565                 val->intval = port->usb_type;
4566                 break;
4567         case POWER_SUPPLY_PROP_ONLINE:
4568                 ret = tcpm_psy_get_online(port, val);
4569                 break;
4570         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
4571                 ret = tcpm_psy_get_voltage_min(port, val);
4572                 break;
4573         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
4574                 ret = tcpm_psy_get_voltage_max(port, val);
4575                 break;
4576         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4577                 ret = tcpm_psy_get_voltage_now(port, val);
4578                 break;
4579         case POWER_SUPPLY_PROP_CURRENT_MAX:
4580                 ret = tcpm_psy_get_current_max(port, val);
4581                 break;
4582         case POWER_SUPPLY_PROP_CURRENT_NOW:
4583                 ret = tcpm_psy_get_current_now(port, val);
4584                 break;
4585         default:
4586                 ret = -EINVAL;
4587                 break;
4588         }
4589
4590         return ret;
4591 }
4592
4593 static int tcpm_psy_set_online(struct tcpm_port *port,
4594                                const union power_supply_propval *val)
4595 {
4596         int ret;
4597
4598         switch (val->intval) {
4599         case TCPM_PSY_FIXED_ONLINE:
4600                 ret = tcpm_pps_activate(port, false);
4601                 break;
4602         case TCPM_PSY_PROG_ONLINE:
4603                 ret = tcpm_pps_activate(port, true);
4604                 break;
4605         default:
4606                 ret = -EINVAL;
4607                 break;
4608         }
4609
4610         return ret;
4611 }
4612
4613 static int tcpm_psy_set_prop(struct power_supply *psy,
4614                              enum power_supply_property psp,
4615                              const union power_supply_propval *val)
4616 {
4617         struct tcpm_port *port = power_supply_get_drvdata(psy);
4618         int ret;
4619
4620         switch (psp) {
4621         case POWER_SUPPLY_PROP_ONLINE:
4622                 ret = tcpm_psy_set_online(port, val);
4623                 break;
4624         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4625                 if (val->intval < port->pps_data.min_volt * 1000 ||
4626                     val->intval > port->pps_data.max_volt * 1000)
4627                         ret = -EINVAL;
4628                 else
4629                         ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
4630                 break;
4631         case POWER_SUPPLY_PROP_CURRENT_NOW:
4632                 if (val->intval > port->pps_data.max_curr * 1000)
4633                         ret = -EINVAL;
4634                 else
4635                         ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
4636                 break;
4637         default:
4638                 ret = -EINVAL;
4639                 break;
4640         }
4641
4642         return ret;
4643 }
4644
4645 static int tcpm_psy_prop_writeable(struct power_supply *psy,
4646                                    enum power_supply_property psp)
4647 {
4648         switch (psp) {
4649         case POWER_SUPPLY_PROP_ONLINE:
4650         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
4651         case POWER_SUPPLY_PROP_CURRENT_NOW:
4652                 return 1;
4653         default:
4654                 return 0;
4655         }
4656 }
4657
4658 static enum power_supply_usb_type tcpm_psy_usb_types[] = {
4659         POWER_SUPPLY_USB_TYPE_C,
4660         POWER_SUPPLY_USB_TYPE_PD,
4661         POWER_SUPPLY_USB_TYPE_PD_PPS,
4662 };
4663
4664 static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
4665
4666 static int devm_tcpm_psy_register(struct tcpm_port *port)
4667 {
4668         struct power_supply_config psy_cfg = {};
4669         const char *port_dev_name = dev_name(port->dev);
4670         size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
4671                                      strlen(port_dev_name) + 1;
4672         char *psy_name;
4673
4674         psy_cfg.drv_data = port;
4675         psy_cfg.fwnode = dev_fwnode(port->dev);
4676         psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
4677         if (!psy_name)
4678                 return -ENOMEM;
4679
4680         snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
4681                  port_dev_name);
4682         port->psy_desc.name = psy_name;
4683         port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
4684         port->psy_desc.usb_types = tcpm_psy_usb_types;
4685         port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
4686         port->psy_desc.properties = tcpm_psy_props,
4687         port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
4688         port->psy_desc.get_property = tcpm_psy_get_prop,
4689         port->psy_desc.set_property = tcpm_psy_set_prop,
4690         port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
4691
4692         port->usb_type = POWER_SUPPLY_USB_TYPE_C;
4693
4694         port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
4695                                                &psy_cfg);
4696
4697         return PTR_ERR_OR_ZERO(port->psy);
4698 }
4699
4700 static int tcpm_copy_caps(struct tcpm_port *port,
4701                           const struct tcpc_config *tcfg)
4702 {
4703         if (tcpm_validate_caps(port, tcfg->src_pdo, tcfg->nr_src_pdo) ||
4704             tcpm_validate_caps(port, tcfg->snk_pdo, tcfg->nr_snk_pdo))
4705                 return -EINVAL;
4706
4707         port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcfg->src_pdo,
4708                                           tcfg->nr_src_pdo);
4709         port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcfg->snk_pdo,
4710                                           tcfg->nr_snk_pdo);
4711
4712         port->nr_snk_vdo = tcpm_copy_vdos(port->snk_vdo, tcfg->snk_vdo,
4713                                           tcfg->nr_snk_vdo);
4714
4715         port->operating_snk_mw = tcfg->operating_snk_mw;
4716
4717         port->typec_caps.prefer_role = tcfg->default_role;
4718         port->typec_caps.type = tcfg->type;
4719         port->typec_caps.data = tcfg->data;
4720
4721         return 0;
4722 }
4723
4724 struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
4725 {
4726         struct tcpm_port *port;
4727         int i, err;
4728
4729         if (!dev || !tcpc ||
4730             !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
4731             !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
4732             !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
4733                 return ERR_PTR(-EINVAL);
4734
4735         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
4736         if (!port)
4737                 return ERR_PTR(-ENOMEM);
4738
4739         port->dev = dev;
4740         port->tcpc = tcpc;
4741
4742         mutex_init(&port->lock);
4743         mutex_init(&port->swap_lock);
4744
4745         port->wq = create_singlethread_workqueue(dev_name(dev));
4746         if (!port->wq)
4747                 return ERR_PTR(-ENOMEM);
4748         INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
4749         INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
4750         INIT_WORK(&port->event_work, tcpm_pd_event_handler);
4751
4752         spin_lock_init(&port->pd_event_lock);
4753
4754         init_completion(&port->tx_complete);
4755         init_completion(&port->swap_complete);
4756         init_completion(&port->pps_complete);
4757         tcpm_debugfs_init(port);
4758
4759         err = tcpm_fw_get_caps(port, tcpc->fwnode);
4760         if ((err < 0) && tcpc->config)
4761                 err = tcpm_copy_caps(port, tcpc->config);
4762         if (err < 0)
4763                 goto out_destroy_wq;
4764
4765         if (!tcpc->config || !tcpc->config->try_role_hw)
4766                 port->try_role = port->typec_caps.prefer_role;
4767         else
4768                 port->try_role = TYPEC_NO_PREFERRED_ROLE;
4769
4770         port->typec_caps.fwnode = tcpc->fwnode;
4771         port->typec_caps.revision = 0x0120;     /* Type-C spec release 1.2 */
4772         port->typec_caps.pd_revision = 0x0300;  /* USB-PD spec release 3.0 */
4773         port->typec_caps.dr_set = tcpm_dr_set;
4774         port->typec_caps.pr_set = tcpm_pr_set;
4775         port->typec_caps.vconn_set = tcpm_vconn_set;
4776         port->typec_caps.try_role = tcpm_try_role;
4777         port->typec_caps.port_type_set = tcpm_port_type_set;
4778
4779         port->partner_desc.identity = &port->partner_ident;
4780         port->port_type = port->typec_caps.type;
4781
4782         port->role_sw = usb_role_switch_get(port->dev);
4783         if (IS_ERR(port->role_sw)) {
4784                 err = PTR_ERR(port->role_sw);
4785                 goto out_destroy_wq;
4786         }
4787
4788         err = devm_tcpm_psy_register(port);
4789         if (err)
4790                 goto out_destroy_wq;
4791
4792         port->typec_port = typec_register_port(port->dev, &port->typec_caps);
4793         if (IS_ERR(port->typec_port)) {
4794                 err = PTR_ERR(port->typec_port);
4795                 goto out_destroy_wq;
4796         }
4797
4798         if (tcpc->config && tcpc->config->alt_modes) {
4799                 const struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
4800
4801                 i = 0;
4802                 while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
4803                         struct typec_altmode *alt;
4804
4805                         alt = typec_port_register_altmode(port->typec_port,
4806                                                           paltmode);
4807                         if (IS_ERR(alt)) {
4808                                 tcpm_log(port,
4809                                          "%s: failed to register port alternate mode 0x%x",
4810                                          dev_name(dev), paltmode->svid);
4811                                 break;
4812                         }
4813                         typec_altmode_set_drvdata(alt, port);
4814                         alt->ops = &tcpm_altmode_ops;
4815                         port->port_altmode[i] = alt;
4816                         i++;
4817                         paltmode++;
4818                 }
4819         }
4820
4821         mutex_lock(&port->lock);
4822         tcpm_init(port);
4823         mutex_unlock(&port->lock);
4824
4825         tcpm_log(port, "%s: registered", dev_name(dev));
4826         return port;
4827
4828 out_destroy_wq:
4829         usb_role_switch_put(port->role_sw);
4830         destroy_workqueue(port->wq);
4831         return ERR_PTR(err);
4832 }
4833 EXPORT_SYMBOL_GPL(tcpm_register_port);
4834
4835 void tcpm_unregister_port(struct tcpm_port *port)
4836 {
4837         int i;
4838
4839         tcpm_reset_port(port);
4840         for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
4841                 typec_unregister_altmode(port->port_altmode[i]);
4842         typec_unregister_port(port->typec_port);
4843         usb_role_switch_put(port->role_sw);
4844         tcpm_debugfs_exit(port);
4845         destroy_workqueue(port->wq);
4846 }
4847 EXPORT_SYMBOL_GPL(tcpm_unregister_port);
4848
4849 MODULE_AUTHOR("Guenter Roeck <[email protected]>");
4850 MODULE_DESCRIPTION("USB Type-C Port Manager");
4851 MODULE_LICENSE("GPL");