drivers/usb/gadget/function/f_uac2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * f_uac2.c -- USB Audio Class 2.0 Function
   4  *
   5  * Copyright (C) 2011
   6  *    Yadwinder Singh ([email protected])
   7  *    Jaswinder Singh ([email protected])
   8  *
   9  * Copyright (C) 2020
  10  *    Ruslan Bilovol ([email protected])
  11  */
  12
  13 #include <linux/usb/audio.h>
  14 #include <linux/usb/audio-v2.h>
  15 #include <linux/module.h>
  16
  17 #include "u_audio.h"
  18
  19 #include "u_uac2.h"
  20
  21 /* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
  22 #define UAC2_CHANNEL_MASK 0x07FFFFFF
  23
  24 /*
  25  * The driver implements a simple UAC_2 topology.
  26  * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
  27  * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
  28  * Capture and Playback sampling rates are independently
  29  *  controlled by two clock sources :
  30  *    CLK_5 := c_srate, and CLK_6 := p_srate
  31  */
  32 #define USB_OUT_CLK_ID  (out_clk_src_desc.bClockID)
  33 #define USB_IN_CLK_ID   (in_clk_src_desc.bClockID)
  34 #define USB_OUT_FU_ID   (out_feature_unit_desc->bUnitID)
  35 #define USB_IN_FU_ID    (in_feature_unit_desc->bUnitID)
  36
  37 #define CONTROL_ABSENT  0
  38 #define CONTROL_RDONLY  1
  39 #define CONTROL_RDWR    3
  40
  41 #define CLK_FREQ_CTRL   0
  42 #define CLK_VLD_CTRL    2
  43 #define FU_MUTE_CTRL    0
  44 #define FU_VOL_CTRL     2
  45
  46 #define COPY_CTRL       0
  47 #define CONN_CTRL       2
  48 #define OVRLD_CTRL      4
  49 #define CLSTR_CTRL      6
  50 #define UNFLW_CTRL      8
  51 #define OVFLW_CTRL      10
  52
  53 #define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
  54 #define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
  55 #define FUIN_EN(_opts) (EPIN_EN(_opts) \
  56                                 && ((_opts)->p_mute_present \
  57                                 || (_opts)->p_volume_present))
  58 #define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
  59                                 && ((_opts)->c_mute_present \
  60                                 || (_opts)->c_volume_present))
  61 #define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
  62
  63 struct f_uac2 {
  64         struct g_audio g_audio;
  65         u8 ac_intf, as_in_intf, as_out_intf;
  66         u8 ac_alt, as_in_alt, as_out_alt;       /* needed for get_alt() */
  67
  68         struct usb_ctrlrequest setup_cr;        /* will be used in data stage */
  69
  70         /* Interrupt IN endpoint of AC interface */
  71         struct usb_ep   *int_ep;
  72         atomic_t        int_count;
  73         /* transient state, only valid during handling of a single control request */
  74         int clock_id;
  75 };
  76
  77 static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
  78 {
  79         return container_of(f, struct f_uac2, g_audio.func);
  80 }
  81
  82 static inline
  83 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
  84 {
  85         return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
  86 }
  87
  88 static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
  89
  90 /* --------- USB Function Interface ------------- */
  91
  92 enum {
  93         STR_ASSOC,
  94         STR_IF_CTRL,
  95         STR_CLKSRC_IN,
  96         STR_CLKSRC_OUT,
  97         STR_USB_IT,
  98         STR_USB_IT_CH,
  99         STR_IO_IT,
 100         STR_IO_IT_CH,
 101         STR_USB_OT,
 102         STR_IO_OT,
 103         STR_FU_IN,
 104         STR_FU_OUT,
 105         STR_AS_OUT_ALT0,
 106         STR_AS_OUT_ALT1,
 107         STR_AS_IN_ALT0,
 108         STR_AS_IN_ALT1,
 109         NUM_STR_DESCRIPTORS,
 110 };
 111
 112 static struct usb_string strings_fn[NUM_STR_DESCRIPTORS + 1] = {};
 113
 114 static const char *const speed_names[] = {
 115         [USB_SPEED_UNKNOWN] = "UNKNOWN",
 116         [USB_SPEED_LOW] = "LS",
 117         [USB_SPEED_FULL] = "FS",
 118         [USB_SPEED_HIGH] = "HS",
 119         [USB_SPEED_WIRELESS] = "W",
 120         [USB_SPEED_SUPER] = "SS",
 121         [USB_SPEED_SUPER_PLUS] = "SS+",
 122 };
 123
 124 static struct usb_gadget_strings str_fn = {
 125         .language = 0x0409,     /* en-us */
 126         .strings = strings_fn,
 127 };
 128
 129 static struct usb_gadget_strings *fn_strings[] = {
 130         &str_fn,
 131         NULL,
 132 };
 133
 134 static struct usb_interface_assoc_descriptor iad_desc = {
 135         .bLength = sizeof iad_desc,
 136         .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
 137
 138         .bFirstInterface = 0,
 139         .bInterfaceCount = 3,
 140         .bFunctionClass = USB_CLASS_AUDIO,
 141         .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
 142         .bFunctionProtocol = UAC_VERSION_2,
 143 };
 144
 145 /* Audio Control Interface */
 146 static struct usb_interface_descriptor std_ac_if_desc = {
 147         .bLength = sizeof std_ac_if_desc,
 148         .bDescriptorType = USB_DT_INTERFACE,
 149
 150         .bAlternateSetting = 0,
 151         /* .bNumEndpoints = DYNAMIC */
 152         .bInterfaceClass = USB_CLASS_AUDIO,
 153         .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
 154         .bInterfaceProtocol = UAC_VERSION_2,
 155 };
 156
 157 /* Clock source for IN traffic */
 158 static struct uac_clock_source_descriptor in_clk_src_desc = {
 159         .bLength = sizeof in_clk_src_desc,
 160         .bDescriptorType = USB_DT_CS_INTERFACE,
 161
 162         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 163         /* .bClockID = DYNAMIC */
 164         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 165         .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
 166         .bAssocTerminal = 0,
 167 };
 168
 169 /* Clock source for OUT traffic */
 170 static struct uac_clock_source_descriptor out_clk_src_desc = {
 171         .bLength = sizeof out_clk_src_desc,
 172         .bDescriptorType = USB_DT_CS_INTERFACE,
 173
 174         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 175         /* .bClockID = DYNAMIC */
 176         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 177         .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
 178         .bAssocTerminal = 0,
 179 };
 180
 181 /* Input Terminal for USB_OUT */
 182 static struct uac2_input_terminal_descriptor usb_out_it_desc = {
 183         .bLength = sizeof usb_out_it_desc,
 184         .bDescriptorType = USB_DT_CS_INTERFACE,
 185
 186         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 187         /* .bTerminalID = DYNAMIC */
 188         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 189         .bAssocTerminal = 0,
 190         /* .bCSourceID = DYNAMIC */
 191         .iChannelNames = 0,
 192         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 193 };
 194
 195 /* Input Terminal for I/O-In */
 196 static struct uac2_input_terminal_descriptor io_in_it_desc = {
 197         .bLength = sizeof io_in_it_desc,
 198         .bDescriptorType = USB_DT_CS_INTERFACE,
 199
 200         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 201         /* .bTerminalID = DYNAMIC */
 202         /* .wTerminalType = DYNAMIC */
 203         .bAssocTerminal = 0,
 204         /* .bCSourceID = DYNAMIC */
 205         .iChannelNames = 0,
 206         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 207 };
 208
 209 /* Ouput Terminal for USB_IN */
 210 static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
 211         .bLength = sizeof usb_in_ot_desc,
 212         .bDescriptorType = USB_DT_CS_INTERFACE,
 213
 214         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 215         /* .bTerminalID = DYNAMIC */
 216         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 217         .bAssocTerminal = 0,
 218         /* .bSourceID = DYNAMIC */
 219         /* .bCSourceID = DYNAMIC */
 220         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 221 };
 222
 223 /* Ouput Terminal for I/O-Out */
 224 static struct uac2_output_terminal_descriptor io_out_ot_desc = {
 225         .bLength = sizeof io_out_ot_desc,
 226         .bDescriptorType = USB_DT_CS_INTERFACE,
 227
 228         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 229         /* .bTerminalID = DYNAMIC */
 230         /* .wTerminalType = DYNAMIC */
 231         .bAssocTerminal = 0,
 232         /* .bSourceID = DYNAMIC */
 233         /* .bCSourceID = DYNAMIC */
 234         .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
 235 };
 236
 237 static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
 238 static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
 239
 240 static struct uac2_ac_header_descriptor ac_hdr_desc = {
 241         .bLength = sizeof ac_hdr_desc,
 242         .bDescriptorType = USB_DT_CS_INTERFACE,
 243
 244         .bDescriptorSubtype = UAC_MS_HEADER,
 245         .bcdADC = cpu_to_le16(0x200),
 246         .bCategory = UAC2_FUNCTION_IO_BOX,
 247         /* .wTotalLength = DYNAMIC */
 248         .bmControls = 0,
 249 };
 250
 251 /* AC IN Interrupt Endpoint */
 252 static struct usb_endpoint_descriptor fs_ep_int_desc = {
 253         .bLength = USB_DT_ENDPOINT_SIZE,
 254         .bDescriptorType = USB_DT_ENDPOINT,
 255
 256         .bEndpointAddress = USB_DIR_IN,
 257         .bmAttributes = USB_ENDPOINT_XFER_INT,
 258         .wMaxPacketSize = cpu_to_le16(6),
 259         .bInterval = 1,
 260 };
 261
 262 static struct usb_endpoint_descriptor hs_ep_int_desc = {
 263         .bLength = USB_DT_ENDPOINT_SIZE,
 264         .bDescriptorType = USB_DT_ENDPOINT,
 265
 266         .bmAttributes = USB_ENDPOINT_XFER_INT,
 267         .wMaxPacketSize = cpu_to_le16(6),
 268         .bInterval = 4,
 269 };
 270
 271 static struct usb_endpoint_descriptor ss_ep_int_desc = {
 272         .bLength = USB_DT_ENDPOINT_SIZE,
 273         .bDescriptorType = USB_DT_ENDPOINT,
 274
 275         .bEndpointAddress = USB_DIR_IN,
 276         .bmAttributes = USB_ENDPOINT_XFER_INT,
 277         .wMaxPacketSize = cpu_to_le16(6),
 278         .bInterval = 4,
 279 };
 280
 281 static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
 282         .bLength = sizeof(ss_ep_int_desc_comp),
 283         .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
 284         .wBytesPerInterval = cpu_to_le16(6),
 285 };
 286
 287 /* Audio Streaming OUT Interface - Alt0 */
 288 static struct usb_interface_descriptor std_as_out_if0_desc = {
 289         .bLength = sizeof std_as_out_if0_desc,
 290         .bDescriptorType = USB_DT_INTERFACE,
 291
 292         .bAlternateSetting = 0,
 293         .bNumEndpoints = 0,
 294         .bInterfaceClass = USB_CLASS_AUDIO,
 295         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 296         .bInterfaceProtocol = UAC_VERSION_2,
 297 };
 298
 299 /* Audio Streaming OUT Interface - Alt1 */
 300 static struct usb_interface_descriptor std_as_out_if1_desc = {
 301         .bLength = sizeof std_as_out_if1_desc,
 302         .bDescriptorType = USB_DT_INTERFACE,
 303
 304         .bAlternateSetting = 1,
 305         .bNumEndpoints = 1,
 306         .bInterfaceClass = USB_CLASS_AUDIO,
 307         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 308         .bInterfaceProtocol = UAC_VERSION_2,
 309 };
 310
 311 /* Audio Stream OUT Intface Desc */
 312 static struct uac2_as_header_descriptor as_out_hdr_desc = {
 313         .bLength = sizeof as_out_hdr_desc,
 314         .bDescriptorType = USB_DT_CS_INTERFACE,
 315
 316         .bDescriptorSubtype = UAC_AS_GENERAL,
 317         /* .bTerminalLink = DYNAMIC */
 318         .bmControls = 0,
 319         .bFormatType = UAC_FORMAT_TYPE_I,
 320         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 321         .iChannelNames = 0,
 322 };
 323
 324 /* Audio USB_OUT Format */
 325 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
 326         .bLength = sizeof as_out_fmt1_desc,
 327         .bDescriptorType = USB_DT_CS_INTERFACE,
 328         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 329         .bFormatType = UAC_FORMAT_TYPE_I,
 330 };
 331
 332 /* STD AS ISO OUT Endpoint */
 333 static struct usb_endpoint_descriptor fs_epout_desc = {
 334         .bLength = USB_DT_ENDPOINT_SIZE,
 335         .bDescriptorType = USB_DT_ENDPOINT,
 336
 337         .bEndpointAddress = USB_DIR_OUT,
 338         /* .bmAttributes = DYNAMIC */
 339         /* .wMaxPacketSize = DYNAMIC */
 340         .bInterval = 1,
 341 };
 342
 343 static struct usb_endpoint_descriptor hs_epout_desc = {
 344         .bLength = USB_DT_ENDPOINT_SIZE,
 345         .bDescriptorType = USB_DT_ENDPOINT,
 346
 347         /* .bmAttributes = DYNAMIC */
 348         /* .wMaxPacketSize = DYNAMIC */
 349         /* .bInterval = DYNAMIC */
 350 };
 351
 352 static struct usb_endpoint_descriptor ss_epout_desc = {
 353         .bLength = USB_DT_ENDPOINT_SIZE,
 354         .bDescriptorType = USB_DT_ENDPOINT,
 355
 356         .bEndpointAddress = USB_DIR_OUT,
 357         /* .bmAttributes = DYNAMIC */
 358         /* .wMaxPacketSize = DYNAMIC */
 359         /* .bInterval = DYNAMIC */
 360 };
 361
 362 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
 363         .bLength                = sizeof(ss_epout_desc_comp),
 364         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 365         .bMaxBurst              = 0,
 366         .bmAttributes           = 0,
 367         /* wBytesPerInterval = DYNAMIC */
 368 };
 369
 370 /* CS AS ISO OUT Endpoint */
 371 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
 372         .bLength = sizeof as_iso_out_desc,
 373         .bDescriptorType = USB_DT_CS_ENDPOINT,
 374
 375         .bDescriptorSubtype = UAC_EP_GENERAL,
 376         .bmAttributes = 0,
 377         .bmControls = 0,
 378         .bLockDelayUnits = 0,
 379         .wLockDelay = 0,
 380 };
 381
 382 /* STD AS ISO IN Feedback Endpoint */
 383 static struct usb_endpoint_descriptor fs_epin_fback_desc = {
 384         .bLength = USB_DT_ENDPOINT_SIZE,
 385         .bDescriptorType = USB_DT_ENDPOINT,
 386
 387         .bEndpointAddress = USB_DIR_IN,
 388         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 389         .wMaxPacketSize = cpu_to_le16(3),
 390         .bInterval = 1,
 391 };
 392
 393 static struct usb_endpoint_descriptor hs_epin_fback_desc = {
 394         .bLength = USB_DT_ENDPOINT_SIZE,
 395         .bDescriptorType = USB_DT_ENDPOINT,
 396
 397         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 398         .wMaxPacketSize = cpu_to_le16(4),
 399         .bInterval = 4,
 400 };
 401
 402 static struct usb_endpoint_descriptor ss_epin_fback_desc = {
 403         .bLength = USB_DT_ENDPOINT_SIZE,
 404         .bDescriptorType = USB_DT_ENDPOINT,
 405
 406         .bEndpointAddress = USB_DIR_IN,
 407         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
 408         .wMaxPacketSize = cpu_to_le16(4),
 409         .bInterval = 4,
 410 };
 411
 412 static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
 413         .bLength                = sizeof(ss_epin_fback_desc_comp),
 414         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 415         .bMaxBurst              = 0,
 416         .bmAttributes           = 0,
 417         .wBytesPerInterval      = cpu_to_le16(4),
 418 };
 419
 420
 421 /* Audio Streaming IN Interface - Alt0 */
 422 static struct usb_interface_descriptor std_as_in_if0_desc = {
 423         .bLength = sizeof std_as_in_if0_desc,
 424         .bDescriptorType = USB_DT_INTERFACE,
 425
 426         .bAlternateSetting = 0,
 427         .bNumEndpoints = 0,
 428         .bInterfaceClass = USB_CLASS_AUDIO,
 429         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 430         .bInterfaceProtocol = UAC_VERSION_2,
 431 };
 432
 433 /* Audio Streaming IN Interface - Alt1 */
 434 static struct usb_interface_descriptor std_as_in_if1_desc = {
 435         .bLength = sizeof std_as_in_if1_desc,
 436         .bDescriptorType = USB_DT_INTERFACE,
 437
 438         .bAlternateSetting = 1,
 439         .bNumEndpoints = 1,
 440         .bInterfaceClass = USB_CLASS_AUDIO,
 441         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 442         .bInterfaceProtocol = UAC_VERSION_2,
 443 };
 444
 445 /* Audio Stream IN Intface Desc */
 446 static struct uac2_as_header_descriptor as_in_hdr_desc = {
 447         .bLength = sizeof as_in_hdr_desc,
 448         .bDescriptorType = USB_DT_CS_INTERFACE,
 449
 450         .bDescriptorSubtype = UAC_AS_GENERAL,
 451         /* .bTerminalLink = DYNAMIC */
 452         .bmControls = 0,
 453         .bFormatType = UAC_FORMAT_TYPE_I,
 454         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 455         .iChannelNames = 0,
 456 };
 457
 458 /* Audio USB_IN Format */
 459 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
 460         .bLength = sizeof as_in_fmt1_desc,
 461         .bDescriptorType = USB_DT_CS_INTERFACE,
 462         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 463         .bFormatType = UAC_FORMAT_TYPE_I,
 464 };
 465
 466 /* STD AS ISO IN Endpoint */
 467 static struct usb_endpoint_descriptor fs_epin_desc = {
 468         .bLength = USB_DT_ENDPOINT_SIZE,
 469         .bDescriptorType = USB_DT_ENDPOINT,
 470
 471         .bEndpointAddress = USB_DIR_IN,
 472         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 473         /* .wMaxPacketSize = DYNAMIC */
 474         .bInterval = 1,
 475 };
 476
 477 static struct usb_endpoint_descriptor hs_epin_desc = {
 478         .bLength = USB_DT_ENDPOINT_SIZE,
 479         .bDescriptorType = USB_DT_ENDPOINT,
 480
 481         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 482         /* .wMaxPacketSize = DYNAMIC */
 483         /* .bInterval = DYNAMIC */
 484 };
 485
 486 static struct usb_endpoint_descriptor ss_epin_desc = {
 487         .bLength = USB_DT_ENDPOINT_SIZE,
 488         .bDescriptorType = USB_DT_ENDPOINT,
 489
 490         .bEndpointAddress = USB_DIR_IN,
 491         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 492         /* .wMaxPacketSize = DYNAMIC */
 493         /* .bInterval = DYNAMIC */
 494 };
 495
 496 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
 497         .bLength                = sizeof(ss_epin_desc_comp),
 498         .bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
 499         .bMaxBurst              = 0,
 500         .bmAttributes           = 0,
 501         /* wBytesPerInterval = DYNAMIC */
 502 };
 503
 504 /* CS AS ISO IN Endpoint */
 505 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
 506         .bLength = sizeof as_iso_in_desc,
 507         .bDescriptorType = USB_DT_CS_ENDPOINT,
 508
 509         .bDescriptorSubtype = UAC_EP_GENERAL,
 510         .bmAttributes = 0,
 511         .bmControls = 0,
 512         .bLockDelayUnits = 0,
 513         .wLockDelay = 0,
 514 };
 515
 516 static struct usb_descriptor_header *fs_audio_desc[] = {
 517         (struct usb_descriptor_header *)&iad_desc,
 518         (struct usb_descriptor_header *)&std_ac_if_desc,
 519
 520         (struct usb_descriptor_header *)&ac_hdr_desc,
 521         (struct usb_descriptor_header *)&in_clk_src_desc,
 522         (struct usb_descriptor_header *)&out_clk_src_desc,
 523         (struct usb_descriptor_header *)&usb_out_it_desc,
 524         (struct usb_descriptor_header *)&out_feature_unit_desc,
 525         (struct usb_descriptor_header *)&io_in_it_desc,
 526         (struct usb_descriptor_header *)&usb_in_ot_desc,
 527         (struct usb_descriptor_header *)&in_feature_unit_desc,
 528         (struct usb_descriptor_header *)&io_out_ot_desc,
 529
 530         (struct usb_descriptor_header *)&fs_ep_int_desc,
 531
 532         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 533         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 534
 535         (struct usb_descriptor_header *)&as_out_hdr_desc,
 536         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 537         (struct usb_descriptor_header *)&fs_epout_desc,
 538         (struct usb_descriptor_header *)&as_iso_out_desc,
 539         (struct usb_descriptor_header *)&fs_epin_fback_desc,
 540
 541         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 542         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 543
 544         (struct usb_descriptor_header *)&as_in_hdr_desc,
 545         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 546         (struct usb_descriptor_header *)&fs_epin_desc,
 547         (struct usb_descriptor_header *)&as_iso_in_desc,
 548         NULL,
 549 };
 550
 551 static struct usb_descriptor_header *hs_audio_desc[] = {
 552         (struct usb_descriptor_header *)&iad_desc,
 553         (struct usb_descriptor_header *)&std_ac_if_desc,
 554
 555         (struct usb_descriptor_header *)&ac_hdr_desc,
 556         (struct usb_descriptor_header *)&in_clk_src_desc,
 557         (struct usb_descriptor_header *)&out_clk_src_desc,
 558         (struct usb_descriptor_header *)&usb_out_it_desc,
 559         (struct usb_descriptor_header *)&out_feature_unit_desc,
 560         (struct usb_descriptor_header *)&io_in_it_desc,
 561         (struct usb_descriptor_header *)&usb_in_ot_desc,
 562         (struct usb_descriptor_header *)&in_feature_unit_desc,
 563         (struct usb_descriptor_header *)&io_out_ot_desc,
 564
 565         (struct usb_descriptor_header *)&hs_ep_int_desc,
 566
 567         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 568         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 569
 570         (struct usb_descriptor_header *)&as_out_hdr_desc,
 571         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 572         (struct usb_descriptor_header *)&hs_epout_desc,
 573         (struct usb_descriptor_header *)&as_iso_out_desc,
 574         (struct usb_descriptor_header *)&hs_epin_fback_desc,
 575
 576         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 577         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 578
 579         (struct usb_descriptor_header *)&as_in_hdr_desc,
 580         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 581         (struct usb_descriptor_header *)&hs_epin_desc,
 582         (struct usb_descriptor_header *)&as_iso_in_desc,
 583         NULL,
 584 };
 585
 586 static struct usb_descriptor_header *ss_audio_desc[] = {
 587         (struct usb_descriptor_header *)&iad_desc,
 588         (struct usb_descriptor_header *)&std_ac_if_desc,
 589
 590         (struct usb_descriptor_header *)&ac_hdr_desc,
 591         (struct usb_descriptor_header *)&in_clk_src_desc,
 592         (struct usb_descriptor_header *)&out_clk_src_desc,
 593         (struct usb_descriptor_header *)&usb_out_it_desc,
 594   (struct usb_descriptor_header *)&out_feature_unit_desc,
 595         (struct usb_descriptor_header *)&io_in_it_desc,
 596         (struct usb_descriptor_header *)&usb_in_ot_desc,
 597         (struct usb_descriptor_header *)&in_feature_unit_desc,
 598         (struct usb_descriptor_header *)&io_out_ot_desc,
 599
 600         (struct usb_descriptor_header *)&ss_ep_int_desc,
 601         (struct usb_descriptor_header *)&ss_ep_int_desc_comp,
 602
 603         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 604         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 605
 606         (struct usb_descriptor_header *)&as_out_hdr_desc,
 607         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 608         (struct usb_descriptor_header *)&ss_epout_desc,
 609         (struct usb_descriptor_header *)&ss_epout_desc_comp,
 610         (struct usb_descriptor_header *)&as_iso_out_desc,
 611         (struct usb_descriptor_header *)&ss_epin_fback_desc,
 612         (struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
 613
 614         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 615         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 616
 617         (struct usb_descriptor_header *)&as_in_hdr_desc,
 618         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 619         (struct usb_descriptor_header *)&ss_epin_desc,
 620         (struct usb_descriptor_header *)&ss_epin_desc_comp,
 621         (struct usb_descriptor_header *)&as_iso_in_desc,
 622         NULL,
 623 };
 624
 625 struct cntrl_cur_lay2 {
 626         __le16  wCUR;
 627 };
 628
 629 struct cntrl_range_lay2 {
 630         __le16  wNumSubRanges;
 631         __le16  wMIN;
 632         __le16  wMAX;
 633         __le16  wRES;
 634 } __packed;
 635
 636 struct cntrl_cur_lay3 {
 637         __le32  dCUR;
 638 };
 639
 640 struct cntrl_subrange_lay3 {
 641         __le32  dMIN;
 642         __le32  dMAX;
 643         __le32  dRES;
 644 } __packed;
 645
 646 #define ranges_lay3_size(c) (sizeof(c.wNumSubRanges)    \
 647                 + le16_to_cpu(c.wNumSubRanges)          \
 648                 * sizeof(struct cntrl_subrange_lay3))
 649
 650 #define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n)            \
 651         struct cntrl_ranges_lay3_##k {                  \
 652         __le16  wNumSubRanges;                          \
 653         struct cntrl_subrange_lay3 r[n];                \
 654 } __packed
 655
 656 DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES);
 657
 658 static int get_max_srate(const int *srates)
 659 {
 660         int i, max_srate = 0;
 661
 662         for (i = 0; i < UAC_MAX_RATES; i++) {
 663                 if (srates[i] == 0)
 664                         break;
 665                 if (srates[i] > max_srate)
 666                         max_srate = srates[i];
 667         }
 668         return max_srate;
 669 }
 670
 671 static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts,
 672         u8 bint, unsigned int factor, bool is_playback)
 673 {
 674         int chmask, srate, ssize;
 675         u16 max_size_bw;
 676
 677         if (is_playback) {
 678                 chmask = uac2_opts->p_chmask;
 679                 srate = get_max_srate(uac2_opts->p_srates);
 680                 ssize = uac2_opts->p_ssize;
 681         } else {
 682                 chmask = uac2_opts->c_chmask;
 683                 srate = get_max_srate(uac2_opts->c_srates);
 684                 ssize = uac2_opts->c_ssize;
 685         }
 686
 687         if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
 688                 // playback is always async, capture only when configured
 689                 // Win10 requires max packet size + 1 frame
 690                 srate = srate * (1000 + uac2_opts->fb_max) / 1000;
 691                 // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
 692                 max_size_bw = num_channels(chmask) * ssize *
 693                         (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))));
 694         } else {
 695                 // adding 1 frame provision for Win10
 696                 max_size_bw = num_channels(chmask) * ssize *
 697                         (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1);
 698         }
 699         return max_size_bw;
 700 }
 701
 702 static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts,
 703         struct usb_endpoint_descriptor *ep_desc,
 704         enum usb_device_speed speed, bool is_playback)
 705 {
 706         u16 max_size_bw, max_size_ep;
 707         u8 bint, opts_bint;
 708         char *dir;
 709
 710         switch (speed) {
 711         case USB_SPEED_FULL:
 712                 max_size_ep = 1023;
 713                 // fixed
 714                 bint = ep_desc->bInterval;
 715                 max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 1000, is_playback);
 716                 break;
 717
 718         case USB_SPEED_HIGH:
 719         case USB_SPEED_SUPER:
 720                 max_size_ep = 1024;
 721                 if (is_playback)
 722                         opts_bint = uac2_opts->p_hs_bint;
 723                 else
 724                         opts_bint = uac2_opts->c_hs_bint;
 725
 726                 if (opts_bint > 0) {
 727                         /* fixed bint */
 728                         bint = opts_bint;
 729                         max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 8000, is_playback);
 730                 } else {
 731                         /* checking bInterval from 4 to 1 whether the required bandwidth fits */
 732                         for (bint = 4; bint > 0; --bint) {
 733                                 max_size_bw = get_max_bw_for_bint(
 734                                         uac2_opts, bint, 8000, is_playback);
 735                                 if (max_size_bw <= max_size_ep)
 736                                         break;
 737                         }
 738                 }
 739                 break;
 740
 741         default:
 742                 return -EINVAL;
 743         }
 744
 745         if (is_playback)
 746                 dir = "Playback";
 747         else
 748                 dir = "Capture";
 749
 750         if (max_size_bw <= max_size_ep)
 751                 dev_dbg(dev,
 752                         "%s %s: Would use wMaxPacketSize %d and bInterval %d\n",
 753                         speed_names[speed], dir, max_size_bw, bint);
 754         else {
 755                 dev_warn(dev,
 756                         "%s %s: Req. wMaxPacketSize %d at bInterval %d > max ISOC %d, may drop data!\n",
 757                         speed_names[speed], dir, max_size_bw, bint, max_size_ep);
 758                 max_size_bw = max_size_ep;
 759         }
 760
 761         ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw);
 762         ep_desc->bInterval = bint;
 763
 764         return 0;
 765 }
 766
 767 static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
 768 {
 769         struct uac2_feature_unit_descriptor *fu_desc;
 770         int channels = num_channels(chmask);
 771         int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
 772
 773         fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
 774         if (!fu_desc)
 775                 return NULL;
 776
 777         fu_desc->bLength = fu_desc_size;
 778         fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
 779
 780         fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
 781
 782         /* bUnitID, bSourceID and bmaControls will be defined later */
 783
 784         return fu_desc;
 785 }
 786
 787 /* Use macro to overcome line length limitation */
 788 #define USBDHDR(p) (struct usb_descriptor_header *)(p)
 789
 790 static void setup_headers(struct f_uac2_opts *opts,
 791                           struct usb_descriptor_header **headers,
 792                           enum usb_device_speed speed)
 793 {
 794         struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
 795         struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
 796         struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
 797         struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
 798         struct usb_endpoint_descriptor *epout_desc;
 799         struct usb_endpoint_descriptor *epin_desc;
 800         struct usb_endpoint_descriptor *epin_fback_desc;
 801         struct usb_endpoint_descriptor *ep_int_desc;
 802         int i;
 803
 804         switch (speed) {
 805         case USB_SPEED_FULL:
 806                 epout_desc = &fs_epout_desc;
 807                 epin_desc = &fs_epin_desc;
 808                 epin_fback_desc = &fs_epin_fback_desc;
 809                 ep_int_desc = &fs_ep_int_desc;
 810                 break;
 811         case USB_SPEED_HIGH:
 812                 epout_desc = &hs_epout_desc;
 813                 epin_desc = &hs_epin_desc;
 814                 epin_fback_desc = &hs_epin_fback_desc;
 815                 ep_int_desc = &hs_ep_int_desc;
 816                 break;
 817         default:
 818                 epout_desc = &ss_epout_desc;
 819                 epin_desc = &ss_epin_desc;
 820                 epout_desc_comp = &ss_epout_desc_comp;
 821                 epin_desc_comp = &ss_epin_desc_comp;
 822                 epin_fback_desc = &ss_epin_fback_desc;
 823                 epin_fback_desc_comp = &ss_epin_fback_desc_comp;
 824                 ep_int_desc = &ss_ep_int_desc;
 825                 ep_int_desc_comp = &ss_ep_int_desc_comp;
 826         }
 827
 828         i = 0;
 829         headers[i++] = USBDHDR(&iad_desc);
 830         headers[i++] = USBDHDR(&std_ac_if_desc);
 831         headers[i++] = USBDHDR(&ac_hdr_desc);
 832         if (EPIN_EN(opts))
 833                 headers[i++] = USBDHDR(&in_clk_src_desc);
 834         if (EPOUT_EN(opts)) {
 835                 headers[i++] = USBDHDR(&out_clk_src_desc);
 836                 headers[i++] = USBDHDR(&usb_out_it_desc);
 837
 838                 if (FUOUT_EN(opts))
 839                         headers[i++] = USBDHDR(out_feature_unit_desc);
 840         }
 841
 842         if (EPIN_EN(opts)) {
 843                 headers[i++] = USBDHDR(&io_in_it_desc);
 844
 845                 if (FUIN_EN(opts))
 846                         headers[i++] = USBDHDR(in_feature_unit_desc);
 847
 848                 headers[i++] = USBDHDR(&usb_in_ot_desc);
 849         }
 850
 851         if (EPOUT_EN(opts))
 852                 headers[i++] = USBDHDR(&io_out_ot_desc);
 853
 854         if (FUOUT_EN(opts) || FUIN_EN(opts)) {
 855                 headers[i++] = USBDHDR(ep_int_desc);
 856                 if (ep_int_desc_comp)
 857                         headers[i++] = USBDHDR(ep_int_desc_comp);
 858         }
 859
 860         if (EPOUT_EN(opts)) {
 861                 headers[i++] = USBDHDR(&std_as_out_if0_desc);
 862                 headers[i++] = USBDHDR(&std_as_out_if1_desc);
 863                 headers[i++] = USBDHDR(&as_out_hdr_desc);
 864                 headers[i++] = USBDHDR(&as_out_fmt1_desc);
 865                 headers[i++] = USBDHDR(epout_desc);
 866                 if (epout_desc_comp)
 867                         headers[i++] = USBDHDR(epout_desc_comp);
 868
 869                 headers[i++] = USBDHDR(&as_iso_out_desc);
 870
 871                 if (EPOUT_FBACK_IN_EN(opts)) {
 872                         headers[i++] = USBDHDR(epin_fback_desc);
 873                         if (epin_fback_desc_comp)
 874                                 headers[i++] = USBDHDR(epin_fback_desc_comp);
 875                 }
 876         }
 877
 878         if (EPIN_EN(opts)) {
 879                 headers[i++] = USBDHDR(&std_as_in_if0_desc);
 880                 headers[i++] = USBDHDR(&std_as_in_if1_desc);
 881                 headers[i++] = USBDHDR(&as_in_hdr_desc);
 882                 headers[i++] = USBDHDR(&as_in_fmt1_desc);
 883                 headers[i++] = USBDHDR(epin_desc);
 884                 if (epin_desc_comp)
 885                         headers[i++] = USBDHDR(epin_desc_comp);
 886
 887                 headers[i++] = USBDHDR(&as_iso_in_desc);
 888         }
 889         headers[i] = NULL;
 890 }
 891
 892 static void setup_descriptor(struct f_uac2_opts *opts)
 893 {
 894         /* patch descriptors */
 895         int i = 1; /* ID's start with 1 */
 896
 897         if (EPOUT_EN(opts))
 898                 usb_out_it_desc.bTerminalID = i++;
 899         if (EPIN_EN(opts))
 900                 io_in_it_desc.bTerminalID = i++;
 901         if (EPOUT_EN(opts))
 902                 io_out_ot_desc.bTerminalID = i++;
 903         if (EPIN_EN(opts))
 904                 usb_in_ot_desc.bTerminalID = i++;
 905         if (FUOUT_EN(opts))
 906                 out_feature_unit_desc->bUnitID = i++;
 907         if (FUIN_EN(opts))
 908                 in_feature_unit_desc->bUnitID = i++;
 909         if (EPOUT_EN(opts))
 910                 out_clk_src_desc.bClockID = i++;
 911         if (EPIN_EN(opts))
 912                 in_clk_src_desc.bClockID = i++;
 913
 914         usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
 915
 916         if (FUIN_EN(opts)) {
 917                 usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
 918                 in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
 919         } else {
 920                 usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
 921         }
 922
 923         usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
 924         io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
 925         io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
 926
 927         if (FUOUT_EN(opts)) {
 928                 io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
 929                 out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
 930         } else {
 931                 io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
 932         }
 933
 934         as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
 935         as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
 936
 937         iad_desc.bInterfaceCount = 1;
 938         ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
 939
 940         if (EPIN_EN(opts)) {
 941                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 942
 943                 len += sizeof(in_clk_src_desc);
 944                 len += sizeof(usb_in_ot_desc);
 945
 946                 if (FUIN_EN(opts))
 947                         len += in_feature_unit_desc->bLength;
 948
 949                 len += sizeof(io_in_it_desc);
 950                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 951                 iad_desc.bInterfaceCount++;
 952         }
 953         if (EPOUT_EN(opts)) {
 954                 u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
 955
 956                 len += sizeof(out_clk_src_desc);
 957                 len += sizeof(usb_out_it_desc);
 958
 959                 if (FUOUT_EN(opts))
 960                         len += out_feature_unit_desc->bLength;
 961
 962                 len += sizeof(io_out_ot_desc);
 963                 ac_hdr_desc.wTotalLength = cpu_to_le16(len);
 964                 iad_desc.bInterfaceCount++;
 965         }
 966
 967         io_in_it_desc.wTerminalType = cpu_to_le16(opts->c_terminal_type);
 968         io_out_ot_desc.wTerminalType = cpu_to_le16(opts->p_terminal_type);
 969
 970         setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
 971         setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
 972         setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
 973 }
 974
 975 static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
 976 {
 977         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
 978         const char *msg = NULL;
 979
 980         if (!opts->p_chmask && !opts->c_chmask)
 981                 msg = "no playback and capture channels";
 982         else if (opts->p_chmask & ~UAC2_CHANNEL_MASK)
 983                 msg = "unsupported playback channels mask";
 984         else if (opts->c_chmask & ~UAC2_CHANNEL_MASK)
 985                 msg = "unsupported capture channels mask";
 986         else if ((opts->p_ssize < 1) || (opts->p_ssize > 4))
 987                 msg = "incorrect playback sample size";
 988         else if ((opts->c_ssize < 1) || (opts->c_ssize > 4))
 989                 msg = "incorrect capture sample size";
 990         else if (!opts->p_srates[0])
 991                 msg = "incorrect playback sampling rate";
 992         else if (!opts->c_srates[0])
 993                 msg = "incorrect capture sampling rate";
 994
 995         else if (opts->p_volume_max <= opts->p_volume_min)
 996                 msg = "incorrect playback volume max/min";
 997         else if (opts->c_volume_max <= opts->c_volume_min)
 998                 msg = "incorrect capture volume max/min";
 999         else if (opts->p_volume_res <= 0)
1000                 msg = "negative/zero playback volume resolution";
1001         else if (opts->c_volume_res <= 0)
1002                 msg = "negative/zero capture volume resolution";
1003
1004         else if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res)
1005                 msg = "incorrect playback volume resolution";
1006         else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res)
1007                 msg = "incorrect capture volume resolution";
1008
1009         else if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4))
1010                 msg = "incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)";
1011         else if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4))
1012                 msg = "incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)";
1013
1014         if (msg) {
1015                 dev_err(dev, "Error: %s\n", msg);
1016                 return -EINVAL;
1017         }
1018
1019         return 0;
1020 }
1021
1022 static int
1023 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
1024 {
1025         struct f_uac2 *uac2 = func_to_uac2(fn);
1026         struct g_audio *agdev = func_to_g_audio(fn);
1027         struct usb_composite_dev *cdev = cfg->cdev;
1028         struct usb_gadget *gadget = cdev->gadget;
1029         struct device *dev = &gadget->dev;
1030         struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
1031         struct usb_string *us;
1032         int ret;
1033
1034         ret = afunc_validate_opts(agdev, dev);
1035         if (ret)
1036                 return ret;
1037
1038         strings_fn[STR_ASSOC].s = uac2_opts->function_name;
1039         strings_fn[STR_IF_CTRL].s = uac2_opts->if_ctrl_name;
1040         strings_fn[STR_CLKSRC_IN].s = uac2_opts->clksrc_in_name;
1041         strings_fn[STR_CLKSRC_OUT].s = uac2_opts->clksrc_out_name;
1042
1043         strings_fn[STR_USB_IT].s = uac2_opts->c_it_name;
1044         strings_fn[STR_USB_IT_CH].s = uac2_opts->c_it_ch_name;
1045         strings_fn[STR_IO_OT].s = uac2_opts->c_ot_name;
1046         strings_fn[STR_FU_OUT].s = uac2_opts->c_fu_vol_name;
1047         strings_fn[STR_AS_OUT_ALT0].s = "Playback Inactive";
1048         strings_fn[STR_AS_OUT_ALT1].s = "Playback Active";
1049
1050         strings_fn[STR_IO_IT].s = uac2_opts->p_it_name;
1051         strings_fn[STR_IO_IT_CH].s = uac2_opts->p_it_ch_name;
1052         strings_fn[STR_USB_OT].s = uac2_opts->p_ot_name;
1053         strings_fn[STR_FU_IN].s = uac2_opts->p_fu_vol_name;
1054         strings_fn[STR_AS_IN_ALT0].s = "Capture Inactive";
1055         strings_fn[STR_AS_IN_ALT1].s = "Capture Active";
1056
1057         us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
1058         if (IS_ERR(us))
1059                 return PTR_ERR(us);
1060
1061         if (FUOUT_EN(uac2_opts)) {
1062                 out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
1063                 if (!out_feature_unit_desc)
1064                         return -ENOMEM;
1065         }
1066         if (FUIN_EN(uac2_opts)) {
1067                 in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
1068                 if (!in_feature_unit_desc) {
1069                         ret = -ENOMEM;
1070                         goto err_free_fu;
1071                 }
1072         }
1073
1074         iad_desc.iFunction = us[STR_ASSOC].id;
1075         std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
1076         in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
1077         out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
1078         usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
1079         usb_out_it_desc.iChannelNames = us[STR_USB_IT_CH].id;
1080         io_in_it_desc.iTerminal = us[STR_IO_IT].id;
1081         io_in_it_desc.iChannelNames = us[STR_IO_IT_CH].id;
1082         usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
1083         io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
1084         std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
1085         std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
1086         std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
1087         std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
1088
1089         if (FUOUT_EN(uac2_opts)) {
1090                 u8 *i_feature = (u8 *)out_feature_unit_desc +
1091                                 out_feature_unit_desc->bLength - 1;
1092                 *i_feature = us[STR_FU_OUT].id;
1093         }
1094         if (FUIN_EN(uac2_opts)) {
1095                 u8 *i_feature = (u8 *)in_feature_unit_desc +
1096                                 in_feature_unit_desc->bLength - 1;
1097                 *i_feature = us[STR_FU_IN].id;
1098         }
1099
1100
1101         /* Initialize the configurable parameters */
1102         usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1103         usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1104         io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1105         io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1106         as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1107         as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1108         as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1109         as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1110         as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1111         as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1112         as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1113         as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1114         if (FUOUT_EN(uac2_opts)) {
1115                 __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
1116                 u32 control = 0;
1117
1118                 if (uac2_opts->c_mute_present)
1119                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1120                 if (uac2_opts->c_volume_present)
1121                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1122                 *bma = cpu_to_le32(control);
1123         }
1124         if (FUIN_EN(uac2_opts)) {
1125                 __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
1126                 u32 control = 0;
1127
1128                 if (uac2_opts->p_mute_present)
1129                         control |= CONTROL_RDWR << FU_MUTE_CTRL;
1130                 if (uac2_opts->p_volume_present)
1131                         control |= CONTROL_RDWR << FU_VOL_CTRL;
1132                 *bma = cpu_to_le32(control);
1133         }
1134
1135         ret = usb_interface_id(cfg, fn);
1136         if (ret < 0) {
1137                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1138                 goto err_free_fu;
1139         }
1140         iad_desc.bFirstInterface = ret;
1141
1142         std_ac_if_desc.bInterfaceNumber = ret;
1143         uac2->ac_intf = ret;
1144         uac2->ac_alt = 0;
1145
1146         if (EPOUT_EN(uac2_opts)) {
1147                 ret = usb_interface_id(cfg, fn);
1148                 if (ret < 0) {
1149                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1150                         goto err_free_fu;
1151                 }
1152                 std_as_out_if0_desc.bInterfaceNumber = ret;
1153                 std_as_out_if1_desc.bInterfaceNumber = ret;
1154                 std_as_out_if1_desc.bNumEndpoints = 1;
1155                 uac2->as_out_intf = ret;
1156                 uac2->as_out_alt = 0;
1157
1158                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1159                         fs_epout_desc.bmAttributes =
1160                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1161                         hs_epout_desc.bmAttributes =
1162                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1163                         ss_epout_desc.bmAttributes =
1164                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
1165                         std_as_out_if1_desc.bNumEndpoints++;
1166                 } else {
1167                         fs_epout_desc.bmAttributes =
1168                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1169                         hs_epout_desc.bmAttributes =
1170                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1171                         ss_epout_desc.bmAttributes =
1172                           USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
1173                 }
1174         }
1175
1176         if (EPIN_EN(uac2_opts)) {
1177                 ret = usb_interface_id(cfg, fn);
1178                 if (ret < 0) {
1179                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1180                         goto err_free_fu;
1181                 }
1182                 std_as_in_if0_desc.bInterfaceNumber = ret;
1183                 std_as_in_if1_desc.bInterfaceNumber = ret;
1184                 uac2->as_in_intf = ret;
1185                 uac2->as_in_alt = 0;
1186         }
1187
1188         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
1189                 uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
1190                 if (!uac2->int_ep) {
1191                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1192                         ret = -ENODEV;
1193                         goto err_free_fu;
1194                 }
1195
1196                 std_ac_if_desc.bNumEndpoints = 1;
1197         }
1198
1199         hs_epin_desc.bInterval = uac2_opts->p_hs_bint;
1200         ss_epin_desc.bInterval = uac2_opts->p_hs_bint;
1201         hs_epout_desc.bInterval = uac2_opts->c_hs_bint;
1202         ss_epout_desc.bInterval = uac2_opts->c_hs_bint;
1203
1204         /* Calculate wMaxPacketSize according to audio bandwidth */
1205         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epin_desc,
1206                                         USB_SPEED_FULL, true);
1207         if (ret < 0) {
1208                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1209                 return ret;
1210         }
1211
1212         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epout_desc,
1213                                         USB_SPEED_FULL, false);
1214         if (ret < 0) {
1215                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1216                 return ret;
1217         }
1218
1219         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epin_desc,
1220                                         USB_SPEED_HIGH, true);
1221         if (ret < 0) {
1222                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1223                 return ret;
1224         }
1225
1226         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epout_desc,
1227                                         USB_SPEED_HIGH, false);
1228         if (ret < 0) {
1229                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1230                 return ret;
1231         }
1232
1233         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epin_desc,
1234                                         USB_SPEED_SUPER, true);
1235         if (ret < 0) {
1236                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1237                 return ret;
1238         }
1239
1240         ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epout_desc,
1241                                         USB_SPEED_SUPER, false);
1242         if (ret < 0) {
1243                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1244                 return ret;
1245         }
1246
1247         if (EPOUT_EN(uac2_opts)) {
1248                 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1249                 if (!agdev->out_ep) {
1250                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1251                         ret = -ENODEV;
1252                         goto err_free_fu;
1253                 }
1254                 if (EPOUT_FBACK_IN_EN(uac2_opts)) {
1255                         agdev->in_ep_fback = usb_ep_autoconfig(gadget,
1256                                                        &fs_epin_fback_desc);
1257                         if (!agdev->in_ep_fback) {
1258                                 dev_err(dev, "%s:%d Error!\n",
1259                                         __func__, __LINE__);
1260                                 ret = -ENODEV;
1261                                 goto err_free_fu;
1262                         }
1263                 }
1264         }
1265
1266         if (EPIN_EN(uac2_opts)) {
1267                 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1268                 if (!agdev->in_ep) {
1269                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1270                         ret = -ENODEV;
1271                         goto err_free_fu;
1272                 }
1273         }
1274
1275         agdev->in_ep_maxpsize = max_t(u16,
1276                                 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
1277                                 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
1278         agdev->out_ep_maxpsize = max_t(u16,
1279                                 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
1280                                 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
1281
1282         agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
1283                                 le16_to_cpu(ss_epin_desc.wMaxPacketSize));
1284         agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
1285                                 le16_to_cpu(ss_epout_desc.wMaxPacketSize));
1286
1287         ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
1288         ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
1289
1290         // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
1291         hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1292         hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1293         hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1294         hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1295         ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1296         ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
1297         ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1298         ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
1299
1300         setup_descriptor(uac2_opts);
1301
1302         ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
1303                                      ss_audio_desc);
1304         if (ret)
1305                 goto err_free_fu;
1306
1307         agdev->gadget = gadget;
1308
1309         agdev->params.p_chmask = uac2_opts->p_chmask;
1310         memcpy(agdev->params.p_srates, uac2_opts->p_srates,
1311                         sizeof(agdev->params.p_srates));
1312         agdev->params.p_ssize = uac2_opts->p_ssize;
1313         if (FUIN_EN(uac2_opts)) {
1314                 agdev->params.p_fu.id = USB_IN_FU_ID;
1315                 agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
1316                 agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
1317                 agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
1318                 agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
1319                 agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
1320         }
1321         agdev->params.c_chmask = uac2_opts->c_chmask;
1322         memcpy(agdev->params.c_srates, uac2_opts->c_srates,
1323                         sizeof(agdev->params.c_srates));
1324         agdev->params.c_ssize = uac2_opts->c_ssize;
1325         if (FUOUT_EN(uac2_opts)) {
1326                 agdev->params.c_fu.id = USB_OUT_FU_ID;
1327                 agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
1328                 agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
1329                 agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
1330                 agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
1331                 agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
1332         }
1333         agdev->params.req_number = uac2_opts->req_number;
1334         agdev->params.fb_max = uac2_opts->fb_max;
1335
1336         if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
1337     agdev->notify = afunc_notify;
1338
1339         ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
1340         if (ret)
1341                 goto err_free_descs;
1342
1343         return 0;
1344
1345 err_free_descs:
1346         usb_free_all_descriptors(fn);
1347         agdev->gadget = NULL;
1348 err_free_fu:
1349         kfree(out_feature_unit_desc);
1350         out_feature_unit_desc = NULL;
1351         kfree(in_feature_unit_desc);
1352         in_feature_unit_desc = NULL;
1353         return ret;
1354 }
1355
1356 static void
1357 afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
1358 {
1359         struct g_audio *agdev = req->context;
1360         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1361
1362         atomic_dec(&uac2->int_count);
1363         kfree(req->buf);
1364         usb_ep_free_request(_ep, req);
1365 }
1366
1367 static int
1368 afunc_notify(struct g_audio *agdev, int unit_id, int cs)
1369 {
1370         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1371         struct usb_request *req;
1372         struct uac2_interrupt_data_msg *msg;
1373         u16 w_index, w_value;
1374         int ret;
1375
1376         if (!uac2->int_ep->enabled)
1377                 return 0;
1378
1379         if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
1380                 atomic_dec(&uac2->int_count);
1381                 return 0;
1382         }
1383
1384         req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
1385         if (req == NULL) {
1386                 ret = -ENOMEM;
1387                 goto err_dec_int_count;
1388         }
1389
1390         msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
1391         if (msg == NULL) {
1392                 ret = -ENOMEM;
1393                 goto err_free_request;
1394         }
1395
1396         w_index = unit_id << 8 | uac2->ac_intf;
1397         w_value = cs << 8;
1398
1399         msg->bInfo = 0; /* Non-vendor, interface interrupt */
1400         msg->bAttribute = UAC2_CS_CUR;
1401         msg->wIndex = cpu_to_le16(w_index);
1402         msg->wValue = cpu_to_le16(w_value);
1403
1404         req->length = sizeof(*msg);
1405         req->buf = msg;
1406         req->context = agdev;
1407         req->complete = afunc_notify_complete;
1408
1409         ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC);
1410
1411         if (ret)
1412                 goto err_free_msg;
1413
1414         return 0;
1415
1416 err_free_msg:
1417         kfree(msg);
1418 err_free_request:
1419         usb_ep_free_request(uac2->int_ep, req);
1420 err_dec_int_count:
1421         atomic_dec(&uac2->int_count);
1422
1423         return ret;
1424 }
1425
1426 static int
1427 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1428 {
1429         struct usb_composite_dev *cdev = fn->config->cdev;
1430         struct f_uac2 *uac2 = func_to_uac2(fn);
1431         struct g_audio *agdev = func_to_g_audio(fn);
1432         struct usb_gadget *gadget = cdev->gadget;
1433         struct device *dev = &gadget->dev;
1434         int ret = 0;
1435
1436         /* No i/f has more than 2 alt settings */
1437         if (alt > 1) {
1438                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1439                 return -EINVAL;
1440         }
1441
1442         if (intf == uac2->ac_intf) {
1443                 /* Control I/f has only 1 AltSetting - 0 */
1444                 if (alt) {
1445                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1446                         return -EINVAL;
1447                 }
1448
1449                 /* restart interrupt endpoint */
1450                 if (uac2->int_ep) {
1451                         usb_ep_disable(uac2->int_ep);
1452                         config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
1453                         usb_ep_enable(uac2->int_ep);
1454                 }
1455
1456                 return 0;
1457         }
1458
1459         if (intf == uac2->as_out_intf) {
1460                 uac2->as_out_alt = alt;
1461
1462                 if (alt)
1463                         ret = u_audio_start_capture(&uac2->g_audio);
1464                 else
1465                         u_audio_stop_capture(&uac2->g_audio);
1466         } else if (intf == uac2->as_in_intf) {
1467                 uac2->as_in_alt = alt;
1468
1469                 if (alt)
1470                         ret = u_audio_start_playback(&uac2->g_audio);
1471                 else
1472                         u_audio_stop_playback(&uac2->g_audio);
1473         } else {
1474                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1475                 return -EINVAL;
1476         }
1477
1478         return ret;
1479 }
1480
1481 static int
1482 afunc_get_alt(struct usb_function *fn, unsigned intf)
1483 {
1484         struct f_uac2 *uac2 = func_to_uac2(fn);
1485         struct g_audio *agdev = func_to_g_audio(fn);
1486
1487         if (intf == uac2->ac_intf)
1488                 return uac2->ac_alt;
1489         else if (intf == uac2->as_out_intf)
1490                 return uac2->as_out_alt;
1491         else if (intf == uac2->as_in_intf)
1492                 return uac2->as_in_alt;
1493         else
1494                 dev_err(&agdev->gadget->dev,
1495                         "%s:%d Invalid Interface %d!\n",
1496                         __func__, __LINE__, intf);
1497
1498         return -EINVAL;
1499 }
1500
1501 static void
1502 afunc_disable(struct usb_function *fn)
1503 {
1504         struct f_uac2 *uac2 = func_to_uac2(fn);
1505
1506         uac2->as_in_alt = 0;
1507         uac2->as_out_alt = 0;
1508         u_audio_stop_capture(&uac2->g_audio);
1509         u_audio_stop_playback(&uac2->g_audio);
1510         if (uac2->int_ep)
1511                 usb_ep_disable(uac2->int_ep);
1512 }
1513
1514 static void
1515 afunc_suspend(struct usb_function *fn)
1516 {
1517         struct f_uac2 *uac2 = func_to_uac2(fn);
1518
1519         u_audio_suspend(&uac2->g_audio);
1520 }
1521
1522 static int
1523 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1524 {
1525         struct usb_request *req = fn->config->cdev->req;
1526         struct g_audio *agdev = func_to_g_audio(fn);
1527         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1528         u16 w_length = le16_to_cpu(cr->wLength);
1529         u16 w_index = le16_to_cpu(cr->wIndex);
1530         u16 w_value = le16_to_cpu(cr->wValue);
1531         u8 entity_id = (w_index >> 8) & 0xff;
1532         u8 control_selector = w_value >> 8;
1533         int value = -EOPNOTSUPP;
1534         u32 p_srate, c_srate;
1535
1536         u_audio_get_playback_srate(agdev, &p_srate);
1537         u_audio_get_capture_srate(agdev, &c_srate);
1538
1539         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1540                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1541                         struct cntrl_cur_lay3 c;
1542
1543                         memset(&c, 0, sizeof(struct cntrl_cur_lay3));
1544
1545                         if (entity_id == USB_IN_CLK_ID)
1546                                 c.dCUR = cpu_to_le32(p_srate);
1547                         else if (entity_id == USB_OUT_CLK_ID)
1548                                 c.dCUR = cpu_to_le32(c_srate);
1549
1550                         value = min_t(unsigned int, w_length, sizeof(c));
1551                         memcpy(req->buf, &c, value);
1552                 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1553                         *(u8 *)req->buf = 1;
1554                         value = min_t(unsigned int, w_length, 1);
1555                 } else {
1556                         dev_err(&agdev->gadget->dev,
1557                                 "%s:%d control_selector=%d TODO!\n",
1558                                 __func__, __LINE__, control_selector);
1559                 }
1560         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1561                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1562                 unsigned int is_playback = 0;
1563
1564                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1565                         is_playback = 1;
1566
1567                 if (control_selector == UAC_FU_MUTE) {
1568                         unsigned int mute;
1569
1570                         u_audio_get_mute(agdev, is_playback, &mute);
1571
1572                         *(u8 *)req->buf = mute;
1573                         value = min_t(unsigned int, w_length, 1);
1574                 } else if (control_selector == UAC_FU_VOLUME) {
1575                         struct cntrl_cur_lay2 c;
1576                         s16 volume;
1577
1578                         memset(&c, 0, sizeof(struct cntrl_cur_lay2));
1579
1580                         u_audio_get_volume(agdev, is_playback, &volume);
1581                         c.wCUR = cpu_to_le16(volume);
1582
1583                         value = min_t(unsigned int, w_length, sizeof(c));
1584                         memcpy(req->buf, &c, value);
1585                 } else {
1586                         dev_err(&agdev->gadget->dev,
1587                                 "%s:%d control_selector=%d TODO!\n",
1588                                 __func__, __LINE__, control_selector);
1589                 }
1590         } else {
1591                 dev_err(&agdev->gadget->dev,
1592                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1593                         __func__, __LINE__, entity_id, control_selector);
1594         }
1595
1596         return value;
1597 }
1598
1599 static int
1600 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1601 {
1602         struct usb_request *req = fn->config->cdev->req;
1603         struct g_audio *agdev = func_to_g_audio(fn);
1604         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1605         u16 w_length = le16_to_cpu(cr->wLength);
1606         u16 w_index = le16_to_cpu(cr->wIndex);
1607         u16 w_value = le16_to_cpu(cr->wValue);
1608         u8 entity_id = (w_index >> 8) & 0xff;
1609         u8 control_selector = w_value >> 8;
1610         int value = -EOPNOTSUPP;
1611
1612         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1613                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1614                         struct cntrl_ranges_lay3_srates rs;
1615                         int i;
1616                         int wNumSubRanges = 0;
1617                         int srate;
1618                         int *srates;
1619
1620                         if (entity_id == USB_IN_CLK_ID)
1621                                 srates = opts->p_srates;
1622                         else if (entity_id == USB_OUT_CLK_ID)
1623                                 srates = opts->c_srates;
1624                         else
1625                                 return -EOPNOTSUPP;
1626                         for (i = 0; i < UAC_MAX_RATES; i++) {
1627                                 srate = srates[i];
1628                                 if (srate == 0)
1629                                         break;
1630
1631                                 rs.r[wNumSubRanges].dMIN = cpu_to_le32(srate);
1632                                 rs.r[wNumSubRanges].dMAX = cpu_to_le32(srate);
1633                                 rs.r[wNumSubRanges].dRES = 0;
1634                                 wNumSubRanges++;
1635                                 dev_dbg(&agdev->gadget->dev,
1636                                         "%s(): clk %d: rate ID %d: %d\n",
1637                                         __func__, entity_id, wNumSubRanges, srate);
1638                         }
1639                         rs.wNumSubRanges = cpu_to_le16(wNumSubRanges);
1640                         value = min_t(unsigned int, w_length, ranges_lay3_size(rs));
1641                         dev_dbg(&agdev->gadget->dev, "%s(): sending %d rates, size %d\n",
1642                                 __func__, rs.wNumSubRanges, value);
1643                         memcpy(req->buf, &rs, value);
1644                 } else {
1645                         dev_err(&agdev->gadget->dev,
1646                                 "%s:%d control_selector=%d TODO!\n",
1647                                 __func__, __LINE__, control_selector);
1648                 }
1649         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1650                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1651                 unsigned int is_playback = 0;
1652
1653                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1654                         is_playback = 1;
1655
1656                 if (control_selector == UAC_FU_VOLUME) {
1657                         struct cntrl_range_lay2 r;
1658                         s16 max_db, min_db, res_db;
1659
1660                         if (is_playback) {
1661                                 max_db = opts->p_volume_max;
1662                                 min_db = opts->p_volume_min;
1663                                 res_db = opts->p_volume_res;
1664                         } else {
1665                                 max_db = opts->c_volume_max;
1666                                 min_db = opts->c_volume_min;
1667                                 res_db = opts->c_volume_res;
1668                         }
1669
1670                         r.wMAX = cpu_to_le16(max_db);
1671                         r.wMIN = cpu_to_le16(min_db);
1672                         r.wRES = cpu_to_le16(res_db);
1673                         r.wNumSubRanges = cpu_to_le16(1);
1674
1675                         value = min_t(unsigned int, w_length, sizeof(r));
1676                         memcpy(req->buf, &r, value);
1677                 } else {
1678                         dev_err(&agdev->gadget->dev,
1679                                 "%s:%d control_selector=%d TODO!\n",
1680                                 __func__, __LINE__, control_selector);
1681                 }
1682         } else {
1683                 dev_err(&agdev->gadget->dev,
1684                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1685                         __func__, __LINE__, entity_id, control_selector);
1686         }
1687
1688         return value;
1689 }
1690
1691 static int
1692 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1693 {
1694         if (cr->bRequest == UAC2_CS_CUR)
1695                 return in_rq_cur(fn, cr);
1696         else if (cr->bRequest == UAC2_CS_RANGE)
1697                 return in_rq_range(fn, cr);
1698         else
1699                 return -EOPNOTSUPP;
1700 }
1701
1702 static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req)
1703 {
1704         struct usb_function *fn = ep->driver_data;
1705         struct g_audio *agdev = func_to_g_audio(fn);
1706         struct f_uac2 *uac2 = func_to_uac2(fn);
1707         u32 val;
1708
1709         if (req->actual != 4)
1710                 return;
1711
1712         val = le32_to_cpu(*((__le32 *)req->buf));
1713         dev_dbg(&agdev->gadget->dev, "%s val: %d.\n", __func__, val);
1714         if (uac2->clock_id == USB_IN_CLK_ID) {
1715                 u_audio_set_playback_srate(agdev, val);
1716         } else if (uac2->clock_id == USB_OUT_CLK_ID) {
1717                 u_audio_set_capture_srate(agdev, val);
1718         }
1719 }
1720
1721 static void
1722 out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
1723 {
1724         struct g_audio *agdev = req->context;
1725         struct usb_composite_dev *cdev = agdev->func.config->cdev;
1726         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1727         struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
1728         struct usb_ctrlrequest *cr = &uac2->setup_cr;
1729         u16 w_index = le16_to_cpu(cr->wIndex);
1730         u16 w_value = le16_to_cpu(cr->wValue);
1731         u8 entity_id = (w_index >> 8) & 0xff;
1732         u8 control_selector = w_value >> 8;
1733
1734         if (req->status != 0) {
1735                 dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
1736                 return;
1737         }
1738
1739         if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1740                 (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1741                 unsigned int is_playback = 0;
1742
1743                 if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
1744                         is_playback = 1;
1745
1746                 if (control_selector == UAC_FU_MUTE) {
1747                         u8 mute = *(u8 *)req->buf;
1748
1749                         u_audio_set_mute(agdev, is_playback, mute);
1750
1751                         return;
1752                 } else if (control_selector == UAC_FU_VOLUME) {
1753                         struct cntrl_cur_lay2 *c = req->buf;
1754                         s16 volume;
1755
1756                         volume = le16_to_cpu(c->wCUR);
1757                         u_audio_set_volume(agdev, is_playback, volume);
1758
1759                         return;
1760                 } else {
1761                         dev_err(&agdev->gadget->dev,
1762                                 "%s:%d control_selector=%d TODO!\n",
1763                                 __func__, __LINE__, control_selector);
1764                         usb_ep_set_halt(ep);
1765                 }
1766         }
1767 }
1768
1769 static int
1770 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1771 {
1772         struct usb_composite_dev *cdev = fn->config->cdev;
1773         struct usb_request *req = fn->config->cdev->req;
1774         struct g_audio *agdev = func_to_g_audio(fn);
1775         struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
1776         struct f_uac2 *uac2 = func_to_uac2(fn);
1777         u16 w_length = le16_to_cpu(cr->wLength);
1778         u16 w_index = le16_to_cpu(cr->wIndex);
1779         u16 w_value = le16_to_cpu(cr->wValue);
1780         u8 entity_id = (w_index >> 8) & 0xff;
1781         u8 control_selector = w_value >> 8;
1782         u8 clock_id = w_index >> 8;
1783
1784         if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
1785                 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1786                         dev_dbg(&agdev->gadget->dev,
1787                                 "control_selector UAC2_CS_CONTROL_SAM_FREQ, clock: %d\n", clock_id);
1788                         cdev->gadget->ep0->driver_data = fn;
1789                         uac2->clock_id = clock_id;
1790                         req->complete = uac2_cs_control_sam_freq;
1791                         return w_length;
1792                 }
1793         } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
1794                         (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
1795                 memcpy(&uac2->setup_cr, cr, sizeof(*cr));
1796                 req->context = agdev;
1797                 req->complete = out_rq_cur_complete;
1798
1799                 return w_length;
1800         } else {
1801                 dev_err(&agdev->gadget->dev,
1802                         "%s:%d entity_id=%d control_selector=%d TODO!\n",
1803                         __func__, __LINE__, entity_id, control_selector);
1804         }
1805         return -EOPNOTSUPP;
1806 }
1807
1808 static int
1809 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1810 {
1811         struct f_uac2 *uac2 = func_to_uac2(fn);
1812         struct g_audio *agdev = func_to_g_audio(fn);
1813         u16 w_index = le16_to_cpu(cr->wIndex);
1814         u8 intf = w_index & 0xff;
1815
1816         if (intf != uac2->ac_intf) {
1817                 dev_err(&agdev->gadget->dev,
1818                         "%s:%d Error!\n", __func__, __LINE__);
1819                 return -EOPNOTSUPP;
1820         }
1821
1822         if (cr->bRequestType & USB_DIR_IN)
1823                 return ac_rq_in(fn, cr);
1824         else if (cr->bRequest == UAC2_CS_CUR)
1825                 return out_rq_cur(fn, cr);
1826
1827         return -EOPNOTSUPP;
1828 }
1829
1830 static int
1831 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1832 {
1833         struct usb_composite_dev *cdev = fn->config->cdev;
1834         struct g_audio *agdev = func_to_g_audio(fn);
1835         struct usb_request *req = cdev->req;
1836         u16 w_length = le16_to_cpu(cr->wLength);
1837         int value = -EOPNOTSUPP;
1838
1839         /* Only Class specific requests are supposed to reach here */
1840         if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1841                 return -EOPNOTSUPP;
1842
1843         if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1844                 value = setup_rq_inf(fn, cr);
1845         else
1846                 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
1847                                 __func__, __LINE__);
1848
1849         if (value >= 0) {
1850                 req->length = value;
1851                 req->zero = value < w_length;
1852                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1853                 if (value < 0) {
1854                         dev_err(&agdev->gadget->dev,
1855                                 "%s:%d Error!\n", __func__, __LINE__);
1856                         req->status = 0;
1857                 }
1858         }
1859
1860         return value;
1861 }
1862
1863 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1864 {
1865         return container_of(to_config_group(item), struct f_uac2_opts,
1866                             func_inst.group);
1867 }
1868
1869 static void f_uac2_attr_release(struct config_item *item)
1870 {
1871         struct f_uac2_opts *opts = to_f_uac2_opts(item);
1872
1873         usb_put_function_instance(&opts->func_inst);
1874 }
1875
1876 static struct configfs_item_operations f_uac2_item_ops = {
1877         .release        = f_uac2_attr_release,
1878 };
1879
1880 #define uac2_kstrtou8 kstrtou8
1881 #define uac2_kstrtou32 kstrtou32
1882 #define uac2_kstrtos16 kstrtos16
1883 #define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
1884
1885 static const char *u8_fmt = "%u\n";
1886 static const char *u32_fmt = "%u\n";
1887 static const char *s16_fmt = "%hd\n";
1888 static const char *bool_fmt = "%u\n";
1889
1890 #define UAC2_ATTRIBUTE(type, name)                                      \
1891 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1892                                          char *page)                    \
1893 {                                                                       \
1894         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1895         int result;                                                     \
1896                                                                         \
1897         mutex_lock(&opts->lock);                                        \
1898         result = sprintf(page, type##_fmt, opts->name);                 \
1899         mutex_unlock(&opts->lock);                                      \
1900                                                                         \
1901         return result;                                                  \
1902 }                                                                       \
1903                                                                         \
1904 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1905                                           const char *page, size_t len) \
1906 {                                                                       \
1907         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1908         int ret;                                                        \
1909         type num;                                                       \
1910                                                                         \
1911         mutex_lock(&opts->lock);                                        \
1912         if (opts->refcnt) {                                             \
1913                 ret = -EBUSY;                                           \
1914                 goto end;                                               \
1915         }                                                               \
1916                                                                         \
1917         ret = uac2_kstrto##type(page, 0, &num);                         \
1918         if (ret)                                                        \
1919                 goto end;                                               \
1920                                                                         \
1921         opts->name = num;                                               \
1922         ret = len;                                                      \
1923                                                                         \
1924 end:                                                                    \
1925         mutex_unlock(&opts->lock);                                      \
1926         return ret;                                                     \
1927 }                                                                       \
1928                                                                         \
1929 CONFIGFS_ATTR(f_uac2_opts_, name)
1930
1931 #define UAC2_ATTRIBUTE_SYNC(name)                                       \
1932 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1933                                          char *page)                    \
1934 {                                                                       \
1935         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1936         int result;                                                     \
1937         char *str;                                                      \
1938                                                                         \
1939         mutex_lock(&opts->lock);                                        \
1940         switch (opts->name) {                                           \
1941         case USB_ENDPOINT_SYNC_ASYNC:                                   \
1942                 str = "async";                                          \
1943                 break;                                                  \
1944         case USB_ENDPOINT_SYNC_ADAPTIVE:                                \
1945                 str = "adaptive";                                       \
1946                 break;                                                  \
1947         default:                                                        \
1948                 str = "unknown";                                        \
1949                 break;                                                  \
1950         }                                                               \
1951         result = sprintf(page, "%s\n", str);                            \
1952         mutex_unlock(&opts->lock);                                      \
1953                                                                         \
1954         return result;                                                  \
1955 }                                                                       \
1956                                                                         \
1957 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
1958                                           const char *page, size_t len) \
1959 {                                                                       \
1960         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1961         int ret = 0;                                                    \
1962                                                                         \
1963         mutex_lock(&opts->lock);                                        \
1964         if (opts->refcnt) {                                             \
1965                 ret = -EBUSY;                                           \
1966                 goto end;                                               \
1967         }                                                               \
1968                                                                         \
1969         if (!strncmp(page, "async", 5))                                 \
1970                 opts->name = USB_ENDPOINT_SYNC_ASYNC;                   \
1971         else if (!strncmp(page, "adaptive", 8))                         \
1972                 opts->name = USB_ENDPOINT_SYNC_ADAPTIVE;                \
1973         else {                                                          \
1974                 ret = -EINVAL;                                          \
1975                 goto end;                                               \
1976         }                                                               \
1977                                                                         \
1978         ret = len;                                                      \
1979                                                                         \
1980 end:                                                                    \
1981         mutex_unlock(&opts->lock);                                      \
1982         return ret;                                                     \
1983 }                                                                       \
1984                                                                         \
1985 CONFIGFS_ATTR(f_uac2_opts_, name)
1986
1987 #define UAC2_RATE_ATTRIBUTE(name)                                       \
1988 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
1989                                          char *page)                    \
1990 {                                                                       \
1991         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
1992         int result = 0;                                                 \
1993         int i;                                                          \
1994                                                                         \
1995         mutex_lock(&opts->lock);                                        \
1996         page[0] = '\0';                                                 \
1997         for (i = 0; i < UAC_MAX_RATES; i++) {                           \
1998                 if (opts->name##s[i] == 0)                              \
1999                         break;                                          \
2000                 result += sprintf(page + strlen(page), "%u,",           \
2001                                 opts->name##s[i]);                      \
2002         }                                                               \
2003         if (strlen(page) > 0)                                           \
2004                 page[strlen(page) - 1] = '\n';                          \
2005         mutex_unlock(&opts->lock);                                      \
2006                                                                         \
2007         return result;                                                  \
2008 }                                                                       \
2009                                                                         \
2010 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
2011                                           const char *page, size_t len) \
2012 {                                                                       \
2013         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2014         char *split_page = NULL;                                        \
2015         int ret = -EINVAL;                                              \
2016         char *token;                                                    \
2017         u32 num;                                                        \
2018         int i;                                                          \
2019                                                                         \
2020         mutex_lock(&opts->lock);                                        \
2021         if (opts->refcnt) {                                             \
2022                 ret = -EBUSY;                                           \
2023                 goto end;                                               \
2024         }                                                               \
2025                                                                         \
2026         i = 0;                                                          \
2027         memset(opts->name##s, 0x00, sizeof(opts->name##s));             \
2028         split_page = kstrdup(page, GFP_KERNEL);                         \
2029         while ((token = strsep(&split_page, ",")) != NULL) {            \
2030                 ret = kstrtou32(token, 0, &num);                        \
2031                 if (ret)                                                \
2032                         goto end;                                       \
2033                                                                         \
2034                 opts->name##s[i++] = num;                               \
2035                 ret = len;                                              \
2036         };                                                              \
2037                                                                         \
2038 end:                                                                    \
2039         kfree(split_page);                                              \
2040         mutex_unlock(&opts->lock);                                      \
2041         return ret;                                                     \
2042 }                                                                       \
2043                                                                         \
2044 CONFIGFS_ATTR(f_uac2_opts_, name)
2045
2046 #define UAC2_ATTRIBUTE_STRING(name)                                     \
2047 static ssize_t f_uac2_opts_##name##_show(struct config_item *item,      \
2048                                          char *page)                    \
2049 {                                                                       \
2050         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2051         int result;                                                     \
2052                                                                         \
2053         mutex_lock(&opts->lock);                                        \
2054         result = scnprintf(page, sizeof(opts->name), "%s", opts->name); \
2055         mutex_unlock(&opts->lock);                                      \
2056                                                                         \
2057         return result;                                                  \
2058 }                                                                       \
2059                                                                         \
2060 static ssize_t f_uac2_opts_##name##_store(struct config_item *item,     \
2061                                           const char *page, size_t len) \
2062 {                                                                       \
2063         struct f_uac2_opts *opts = to_f_uac2_opts(item);                \
2064         int ret = len;                                                  \
2065                                                                         \
2066         mutex_lock(&opts->lock);                                        \
2067         if (opts->refcnt) {                                             \
2068                 ret = -EBUSY;                                           \
2069                 goto end;                                               \
2070         }                                                               \
2071                                                                         \
2072         if (len && page[len - 1] == '\n')                               \
2073                 len--;                                                  \
2074                                                                         \
2075         scnprintf(opts->name, min(sizeof(opts->name), len + 1),         \
2076                   "%s", page);                                          \
2077                                                                         \
2078 end:                                                                    \
2079         mutex_unlock(&opts->lock);                                      \
2080         return ret;                                                     \
2081 }                                                                       \
2082                                                                         \
2083 CONFIGFS_ATTR(f_uac2_opts_, name)
2084
2085 UAC2_ATTRIBUTE(u32, p_chmask);
2086 UAC2_RATE_ATTRIBUTE(p_srate);
2087 UAC2_ATTRIBUTE(u32, p_ssize);
2088 UAC2_ATTRIBUTE(u8, p_hs_bint);
2089 UAC2_ATTRIBUTE(u32, c_chmask);
2090 UAC2_RATE_ATTRIBUTE(c_srate);
2091 UAC2_ATTRIBUTE_SYNC(c_sync);
2092 UAC2_ATTRIBUTE(u32, c_ssize);
2093 UAC2_ATTRIBUTE(u8, c_hs_bint);
2094 UAC2_ATTRIBUTE(u32, req_number);
2095
2096 UAC2_ATTRIBUTE(bool, p_mute_present);
2097 UAC2_ATTRIBUTE(bool, p_volume_present);
2098 UAC2_ATTRIBUTE(s16, p_volume_min);
2099 UAC2_ATTRIBUTE(s16, p_volume_max);
2100 UAC2_ATTRIBUTE(s16, p_volume_res);
2101
2102 UAC2_ATTRIBUTE(bool, c_mute_present);
2103 UAC2_ATTRIBUTE(bool, c_volume_present);
2104 UAC2_ATTRIBUTE(s16, c_volume_min);
2105 UAC2_ATTRIBUTE(s16, c_volume_max);
2106 UAC2_ATTRIBUTE(s16, c_volume_res);
2107 UAC2_ATTRIBUTE(u32, fb_max);
2108 UAC2_ATTRIBUTE_STRING(function_name);
2109 UAC2_ATTRIBUTE_STRING(if_ctrl_name);
2110 UAC2_ATTRIBUTE_STRING(clksrc_in_name);
2111 UAC2_ATTRIBUTE_STRING(clksrc_out_name);
2112
2113 UAC2_ATTRIBUTE_STRING(p_it_name);
2114 UAC2_ATTRIBUTE_STRING(p_it_ch_name);
2115 UAC2_ATTRIBUTE_STRING(p_ot_name);
2116 UAC2_ATTRIBUTE_STRING(p_fu_vol_name);
2117
2118 UAC2_ATTRIBUTE_STRING(c_it_name);
2119 UAC2_ATTRIBUTE_STRING(c_it_ch_name);
2120 UAC2_ATTRIBUTE_STRING(c_ot_name);
2121 UAC2_ATTRIBUTE_STRING(c_fu_vol_name);
2122
2123 UAC2_ATTRIBUTE(s16, p_terminal_type);
2124 UAC2_ATTRIBUTE(s16, c_terminal_type);
2125
2126
2127 static struct configfs_attribute *f_uac2_attrs[] = {
2128         &f_uac2_opts_attr_p_chmask,
2129         &f_uac2_opts_attr_p_srate,
2130         &f_uac2_opts_attr_p_ssize,
2131         &f_uac2_opts_attr_p_hs_bint,
2132         &f_uac2_opts_attr_c_chmask,
2133         &f_uac2_opts_attr_c_srate,
2134         &f_uac2_opts_attr_c_ssize,
2135         &f_uac2_opts_attr_c_hs_bint,
2136         &f_uac2_opts_attr_c_sync,
2137         &f_uac2_opts_attr_req_number,
2138         &f_uac2_opts_attr_fb_max,
2139
2140         &f_uac2_opts_attr_p_mute_present,
2141         &f_uac2_opts_attr_p_volume_present,
2142         &f_uac2_opts_attr_p_volume_min,
2143         &f_uac2_opts_attr_p_volume_max,
2144         &f_uac2_opts_attr_p_volume_res,
2145
2146         &f_uac2_opts_attr_c_mute_present,
2147         &f_uac2_opts_attr_c_volume_present,
2148         &f_uac2_opts_attr_c_volume_min,
2149         &f_uac2_opts_attr_c_volume_max,
2150         &f_uac2_opts_attr_c_volume_res,
2151
2152         &f_uac2_opts_attr_function_name,
2153         &f_uac2_opts_attr_if_ctrl_name,
2154         &f_uac2_opts_attr_clksrc_in_name,
2155         &f_uac2_opts_attr_clksrc_out_name,
2156
2157         &f_uac2_opts_attr_p_it_name,
2158         &f_uac2_opts_attr_p_it_ch_name,
2159         &f_uac2_opts_attr_p_ot_name,
2160         &f_uac2_opts_attr_p_fu_vol_name,
2161
2162         &f_uac2_opts_attr_c_it_name,
2163         &f_uac2_opts_attr_c_it_ch_name,
2164         &f_uac2_opts_attr_c_ot_name,
2165         &f_uac2_opts_attr_c_fu_vol_name,
2166
2167         &f_uac2_opts_attr_p_terminal_type,
2168         &f_uac2_opts_attr_c_terminal_type,
2169
2170         NULL,
2171 };
2172
2173 static const struct config_item_type f_uac2_func_type = {
2174         .ct_item_ops    = &f_uac2_item_ops,
2175         .ct_attrs       = f_uac2_attrs,
2176         .ct_owner       = THIS_MODULE,
2177 };
2178
2179 static void afunc_free_inst(struct usb_function_instance *f)
2180 {
2181         struct f_uac2_opts *opts;
2182
2183         opts = container_of(f, struct f_uac2_opts, func_inst);
2184         kfree(opts);
2185 }
2186
2187 static struct usb_function_instance *afunc_alloc_inst(void)
2188 {
2189         struct f_uac2_opts *opts;
2190
2191         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
2192         if (!opts)
2193                 return ERR_PTR(-ENOMEM);
2194
2195         mutex_init(&opts->lock);
2196         opts->func_inst.free_func_inst = afunc_free_inst;
2197
2198         config_group_init_type_name(&opts->func_inst.group, "",
2199                                     &f_uac2_func_type);
2200
2201         opts->p_chmask = UAC2_DEF_PCHMASK;
2202         opts->p_srates[0] = UAC2_DEF_PSRATE;
2203         opts->p_ssize = UAC2_DEF_PSSIZE;
2204         opts->p_hs_bint = UAC2_DEF_PHSBINT;
2205         opts->c_chmask = UAC2_DEF_CCHMASK;
2206         opts->c_srates[0] = UAC2_DEF_CSRATE;
2207         opts->c_ssize = UAC2_DEF_CSSIZE;
2208         opts->c_hs_bint = UAC2_DEF_CHSBINT;
2209         opts->c_sync = UAC2_DEF_CSYNC;
2210
2211         opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
2212         opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
2213         opts->p_volume_min = UAC2_DEF_MIN_DB;
2214         opts->p_volume_max = UAC2_DEF_MAX_DB;
2215         opts->p_volume_res = UAC2_DEF_RES_DB;
2216
2217         opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
2218         opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
2219         opts->c_volume_min = UAC2_DEF_MIN_DB;
2220         opts->c_volume_max = UAC2_DEF_MAX_DB;
2221         opts->c_volume_res = UAC2_DEF_RES_DB;
2222
2223         opts->req_number = UAC2_DEF_REQ_NUM;
2224         opts->fb_max = FBACK_FAST_MAX;
2225
2226         scnprintf(opts->function_name, sizeof(opts->function_name), "Source/Sink");
2227         scnprintf(opts->if_ctrl_name, sizeof(opts->if_ctrl_name), "Topology Control");
2228         scnprintf(opts->clksrc_in_name, sizeof(opts->clksrc_in_name), "Input Clock");
2229         scnprintf(opts->clksrc_out_name, sizeof(opts->clksrc_out_name), "Output Clock");
2230
2231         scnprintf(opts->p_it_name, sizeof(opts->p_it_name), "USBD Out");
2232         scnprintf(opts->p_it_ch_name, sizeof(opts->p_it_ch_name), "Capture Channels");
2233         scnprintf(opts->p_ot_name, sizeof(opts->p_ot_name), "USBH In");
2234         scnprintf(opts->p_fu_vol_name, sizeof(opts->p_fu_vol_name), "Capture Volume");
2235
2236         scnprintf(opts->c_it_name, sizeof(opts->c_it_name), "USBH Out");
2237         scnprintf(opts->c_it_ch_name, sizeof(opts->c_it_ch_name), "Playback Channels");
2238         scnprintf(opts->c_ot_name, sizeof(opts->c_ot_name), "USBD In");
2239         scnprintf(opts->c_fu_vol_name, sizeof(opts->c_fu_vol_name), "Playback Volume");
2240
2241         opts->p_terminal_type = UAC2_DEF_P_TERM_TYPE;
2242         opts->c_terminal_type = UAC2_DEF_C_TERM_TYPE;
2243
2244         return &opts->func_inst;
2245 }
2246
2247 static void afunc_free(struct usb_function *f)
2248 {
2249         struct g_audio *agdev;
2250         struct f_uac2_opts *opts;
2251
2252         agdev = func_to_g_audio(f);
2253         opts = container_of(f->fi, struct f_uac2_opts, func_inst);
2254         kfree(agdev);
2255         mutex_lock(&opts->lock);
2256         --opts->refcnt;
2257         mutex_unlock(&opts->lock);
2258 }
2259
2260 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
2261 {
2262         struct g_audio *agdev = func_to_g_audio(f);
2263
2264         g_audio_cleanup(agdev);
2265         usb_free_all_descriptors(f);
2266
2267         agdev->gadget = NULL;
2268
2269         kfree(out_feature_unit_desc);
2270         out_feature_unit_desc = NULL;
2271         kfree(in_feature_unit_desc);
2272         in_feature_unit_desc = NULL;
2273 }
2274
2275 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
2276 {
2277         struct f_uac2   *uac2;
2278         struct f_uac2_opts *opts;
2279
2280         uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
2281         if (uac2 == NULL)
2282                 return ERR_PTR(-ENOMEM);
2283
2284         opts = container_of(fi, struct f_uac2_opts, func_inst);
2285         mutex_lock(&opts->lock);
2286         ++opts->refcnt;
2287         mutex_unlock(&opts->lock);
2288
2289         uac2->g_audio.func.name = "uac2_func";
2290         uac2->g_audio.func.bind = afunc_bind;
2291         uac2->g_audio.func.unbind = afunc_unbind;
2292         uac2->g_audio.func.set_alt = afunc_set_alt;
2293         uac2->g_audio.func.get_alt = afunc_get_alt;
2294         uac2->g_audio.func.disable = afunc_disable;
2295         uac2->g_audio.func.suspend = afunc_suspend;
2296         uac2->g_audio.func.setup = afunc_setup;
2297         uac2->g_audio.func.free_func = afunc_free;
2298
2299         return &uac2->g_audio.func;
2300 }
2301
2302 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
2303 MODULE_DESCRIPTION("USB Audio Class 2.0 Function");
2304 MODULE_LICENSE("GPL");
2305 MODULE_AUTHOR("Yadwinder Singh");
2306 MODULE_AUTHOR("Jaswinder Singh");
2307 MODULE_AUTHOR("Ruslan Bilovol");