drivers/usb/gadget/function/f_uac1.c

   1 /*
   2  * f_audio.c -- USB Audio class function driver
   3   *
   4  * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
   5  * Copyright (C) 2008 Analog Devices, Inc
   6  *
   7  * Enter bugs at http://blackfin.uclinux.org/
   8  *
   9  * Licensed under the GPL-2 or later.
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/atomic.h>
  17
  18 #include "u_uac1.h"
  19
  20 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
  21 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
  22
  23 /*
  24  * DESCRIPTORS ... most are static, but strings and full
  25  * configuration descriptors are built on demand.
  26  */
  27
  28 /*
  29  * We have two interfaces- AudioControl and AudioStreaming
  30  * TODO: only supcard playback currently
  31  */
  32 #define F_AUDIO_AC_INTERFACE    0
  33 #define F_AUDIO_AS_INTERFACE    1
  34 #define F_AUDIO_NUM_INTERFACES  2
  35
  36 /* B.3.1  Standard AC Interface Descriptor */
  37 static struct usb_interface_descriptor ac_interface_desc = {
  38         .bLength =              USB_DT_INTERFACE_SIZE,
  39         .bDescriptorType =      USB_DT_INTERFACE,
  40         .bNumEndpoints =        0,
  41         .bInterfaceClass =      USB_CLASS_AUDIO,
  42         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOCONTROL,
  43 };
  44
  45 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
  46
  47 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
  48 /* 1 input terminal, 1 output terminal and 1 feature unit */
  49 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
  50         + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
  51 /* B.3.2  Class-Specific AC Interface Descriptor */
  52 static struct uac1_ac_header_descriptor_2 ac_header_desc = {
  53         .bLength =              UAC_DT_AC_HEADER_LENGTH,
  54         .bDescriptorType =      USB_DT_CS_INTERFACE,
  55         .bDescriptorSubtype =   UAC_HEADER,
  56         .bcdADC =               __constant_cpu_to_le16(0x0100),
  57         .wTotalLength =         __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
  58         .bInCollection =        F_AUDIO_NUM_INTERFACES,
  59         .baInterfaceNr = {
  60                 [0] =           F_AUDIO_AC_INTERFACE,
  61                 [1] =           F_AUDIO_AS_INTERFACE,
  62         }
  63 };
  64
  65 #define INPUT_TERMINAL_ID       1
  66 static struct uac_input_terminal_descriptor input_terminal_desc = {
  67         .bLength =              UAC_DT_INPUT_TERMINAL_SIZE,
  68         .bDescriptorType =      USB_DT_CS_INTERFACE,
  69         .bDescriptorSubtype =   UAC_INPUT_TERMINAL,
  70         .bTerminalID =          INPUT_TERMINAL_ID,
  71         .wTerminalType =        UAC_TERMINAL_STREAMING,
  72         .bAssocTerminal =       0,
  73         .wChannelConfig =       0x3,
  74 };
  75
  76 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
  77
  78 #define FEATURE_UNIT_ID         2
  79 static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
  80         .bLength                = UAC_DT_FEATURE_UNIT_SIZE(0),
  81         .bDescriptorType        = USB_DT_CS_INTERFACE,
  82         .bDescriptorSubtype     = UAC_FEATURE_UNIT,
  83         .bUnitID                = FEATURE_UNIT_ID,
  84         .bSourceID              = INPUT_TERMINAL_ID,
  85         .bControlSize           = 2,
  86         .bmaControls[0]         = (UAC_FU_MUTE | UAC_FU_VOLUME),
  87 };
  88
  89 static struct usb_audio_control mute_control = {
  90         .list = LIST_HEAD_INIT(mute_control.list),
  91         .name = "Mute Control",
  92         .type = UAC_FU_MUTE,
  93         /* Todo: add real Mute control code */
  94         .set = generic_set_cmd,
  95         .get = generic_get_cmd,
  96 };
  97
  98 static struct usb_audio_control volume_control = {
  99         .list = LIST_HEAD_INIT(volume_control.list),
 100         .name = "Volume Control",
 101         .type = UAC_FU_VOLUME,
 102         /* Todo: add real Volume control code */
 103         .set = generic_set_cmd,
 104         .get = generic_get_cmd,
 105 };
 106
 107 static struct usb_audio_control_selector feature_unit = {
 108         .list = LIST_HEAD_INIT(feature_unit.list),
 109         .id = FEATURE_UNIT_ID,
 110         .name = "Mute & Volume Control",
 111         .type = UAC_FEATURE_UNIT,
 112         .desc = (struct usb_descriptor_header *)&feature_unit_desc,
 113 };
 114
 115 #define OUTPUT_TERMINAL_ID      3
 116 static struct uac1_output_terminal_descriptor output_terminal_desc = {
 117         .bLength                = UAC_DT_OUTPUT_TERMINAL_SIZE,
 118         .bDescriptorType        = USB_DT_CS_INTERFACE,
 119         .bDescriptorSubtype     = UAC_OUTPUT_TERMINAL,
 120         .bTerminalID            = OUTPUT_TERMINAL_ID,
 121         .wTerminalType          = UAC_OUTPUT_TERMINAL_SPEAKER,
 122         .bAssocTerminal         = FEATURE_UNIT_ID,
 123         .bSourceID              = FEATURE_UNIT_ID,
 124 };
 125
 126 /* B.4.1  Standard AS Interface Descriptor */
 127 static struct usb_interface_descriptor as_interface_alt_0_desc = {
 128         .bLength =              USB_DT_INTERFACE_SIZE,
 129         .bDescriptorType =      USB_DT_INTERFACE,
 130         .bAlternateSetting =    0,
 131         .bNumEndpoints =        0,
 132         .bInterfaceClass =      USB_CLASS_AUDIO,
 133         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 134 };
 135
 136 static struct usb_interface_descriptor as_interface_alt_1_desc = {
 137         .bLength =              USB_DT_INTERFACE_SIZE,
 138         .bDescriptorType =      USB_DT_INTERFACE,
 139         .bAlternateSetting =    1,
 140         .bNumEndpoints =        1,
 141         .bInterfaceClass =      USB_CLASS_AUDIO,
 142         .bInterfaceSubClass =   USB_SUBCLASS_AUDIOSTREAMING,
 143 };
 144
 145 /* B.4.2  Class-Specific AS Interface Descriptor */
 146 static struct uac1_as_header_descriptor as_header_desc = {
 147         .bLength =              UAC_DT_AS_HEADER_SIZE,
 148         .bDescriptorType =      USB_DT_CS_INTERFACE,
 149         .bDescriptorSubtype =   UAC_AS_GENERAL,
 150         .bTerminalLink =        INPUT_TERMINAL_ID,
 151         .bDelay =               1,
 152         .wFormatTag =           UAC_FORMAT_TYPE_I_PCM,
 153 };
 154
 155 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
 156
 157 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
 158         .bLength =              UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
 159         .bDescriptorType =      USB_DT_CS_INTERFACE,
 160         .bDescriptorSubtype =   UAC_FORMAT_TYPE,
 161         .bFormatType =          UAC_FORMAT_TYPE_I,
 162         .bSubframeSize =        2,
 163         .bBitResolution =       16,
 164         .bSamFreqType =         1,
 165 };
 166
 167 /* Standard ISO OUT Endpoint Descriptor */
 168 static struct usb_endpoint_descriptor as_out_ep_desc  = {
 169         .bLength =              USB_DT_ENDPOINT_AUDIO_SIZE,
 170         .bDescriptorType =      USB_DT_ENDPOINT,
 171         .bEndpointAddress =     USB_DIR_OUT,
 172         .bmAttributes =         USB_ENDPOINT_SYNC_ADAPTIVE
 173                                 | USB_ENDPOINT_XFER_ISOC,
 174         .wMaxPacketSize =       cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 175         .bInterval =            4,
 176 };
 177
 178 /* Class-specific AS ISO OUT Endpoint Descriptor */
 179 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
 180         .bLength =              UAC_ISO_ENDPOINT_DESC_SIZE,
 181         .bDescriptorType =      USB_DT_CS_ENDPOINT,
 182         .bDescriptorSubtype =   UAC_EP_GENERAL,
 183         .bmAttributes =         1,
 184         .bLockDelayUnits =      1,
 185         .wLockDelay =           __constant_cpu_to_le16(1),
 186 };
 187
 188 static struct usb_descriptor_header *f_audio_desc[] = {
 189         (struct usb_descriptor_header *)&ac_interface_desc,
 190         (struct usb_descriptor_header *)&ac_header_desc,
 191
 192         (struct usb_descriptor_header *)&input_terminal_desc,
 193         (struct usb_descriptor_header *)&output_terminal_desc,
 194         (struct usb_descriptor_header *)&feature_unit_desc,
 195
 196         (struct usb_descriptor_header *)&as_interface_alt_0_desc,
 197         (struct usb_descriptor_header *)&as_interface_alt_1_desc,
 198         (struct usb_descriptor_header *)&as_header_desc,
 199
 200         (struct usb_descriptor_header *)&as_type_i_desc,
 201
 202         (struct usb_descriptor_header *)&as_out_ep_desc,
 203         (struct usb_descriptor_header *)&as_iso_out_desc,
 204         NULL,
 205 };
 206
 207 enum {
 208         STR_AC_IF,
 209         STR_INPUT_TERMINAL,
 210         STR_INPUT_TERMINAL_CH_NAMES,
 211         STR_FEAT_DESC_0,
 212         STR_OUTPUT_TERMINAL,
 213         STR_AS_IF_ALT0,
 214         STR_AS_IF_ALT1,
 215 };
 216
 217 static struct usb_string strings_uac1[] = {
 218         [STR_AC_IF].s = "AC Interface",
 219         [STR_INPUT_TERMINAL].s = "Input terminal",
 220         [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
 221         [STR_FEAT_DESC_0].s = "Volume control & mute",
 222         [STR_OUTPUT_TERMINAL].s = "Output terminal",
 223         [STR_AS_IF_ALT0].s = "AS Interface",
 224         [STR_AS_IF_ALT1].s = "AS Interface",
 225         { },
 226 };
 227
 228 static struct usb_gadget_strings str_uac1 = {
 229         .language = 0x0409,     /* en-us */
 230         .strings = strings_uac1,
 231 };
 232
 233 static struct usb_gadget_strings *uac1_strings[] = {
 234         &str_uac1,
 235         NULL,
 236 };
 237
 238 /*
 239  * This function is an ALSA sound card following USB Audio Class Spec 1.0.
 240  */
 241
 242 /*-------------------------------------------------------------------------*/
 243 struct f_audio_buf {
 244         u8 *buf;
 245         int actual;
 246         struct list_head list;
 247 };
 248
 249 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
 250 {
 251         struct f_audio_buf *copy_buf;
 252
 253         copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
 254         if (!copy_buf)
 255                 return ERR_PTR(-ENOMEM);
 256
 257         copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
 258         if (!copy_buf->buf) {
 259                 kfree(copy_buf);
 260                 return ERR_PTR(-ENOMEM);
 261         }
 262
 263         return copy_buf;
 264 }
 265
 266 static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
 267 {
 268         kfree(audio_buf->buf);
 269         kfree(audio_buf);
 270 }
 271 /*-------------------------------------------------------------------------*/
 272
 273 struct f_audio {
 274         struct gaudio                   card;
 275
 276         /* endpoints handle full and/or high speeds */
 277         struct usb_ep                   *out_ep;
 278
 279         spinlock_t                      lock;
 280         struct f_audio_buf *copy_buf;
 281         struct work_struct playback_work;
 282         struct list_head play_queue;
 283
 284         /* Control Set command */
 285         struct list_head cs;
 286         u8 set_cmd;
 287         struct usb_audio_control *set_con;
 288 };
 289
 290 static inline struct f_audio *func_to_audio(struct usb_function *f)
 291 {
 292         return container_of(f, struct f_audio, card.func);
 293 }
 294
 295 /*-------------------------------------------------------------------------*/
 296
 297 static void f_audio_playback_work(struct work_struct *data)
 298 {
 299         struct f_audio *audio = container_of(data, struct f_audio,
 300                                         playback_work);
 301         struct f_audio_buf *play_buf;
 302
 303         spin_lock_irq(&audio->lock);
 304         if (list_empty(&audio->play_queue)) {
 305                 spin_unlock_irq(&audio->lock);
 306                 return;
 307         }
 308         play_buf = list_first_entry(&audio->play_queue,
 309                         struct f_audio_buf, list);
 310         list_del(&play_buf->list);
 311         spin_unlock_irq(&audio->lock);
 312
 313         u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
 314         f_audio_buffer_free(play_buf);
 315 }
 316
 317 static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
 318 {
 319         struct f_audio *audio = req->context;
 320         struct usb_composite_dev *cdev = audio->card.func.config->cdev;
 321         struct f_audio_buf *copy_buf = audio->copy_buf;
 322         struct f_uac1_opts *opts;
 323         int audio_buf_size;
 324         int err;
 325
 326         opts = container_of(audio->card.func.fi, struct f_uac1_opts,
 327                             func_inst);
 328         audio_buf_size = opts->audio_buf_size;
 329
 330         if (!copy_buf)
 331                 return -EINVAL;
 332
 333         /* Copy buffer is full, add it to the play_queue */
 334         if (audio_buf_size - copy_buf->actual < req->actual) {
 335                 list_add_tail(&copy_buf->list, &audio->play_queue);
 336                 schedule_work(&audio->playback_work);
 337                 copy_buf = f_audio_buffer_alloc(audio_buf_size);
 338                 if (IS_ERR(copy_buf))
 339                         return -ENOMEM;
 340         }
 341
 342         memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
 343         copy_buf->actual += req->actual;
 344         audio->copy_buf = copy_buf;
 345
 346         err = usb_ep_queue(ep, req, GFP_ATOMIC);
 347         if (err)
 348                 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
 349
 350         return 0;
 351
 352 }
 353
 354 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
 355 {
 356         struct f_audio *audio = req->context;
 357         int status = req->status;
 358         u32 data = 0;
 359         struct usb_ep *out_ep = audio->out_ep;
 360
 361         switch (status) {
 362
 363         case 0:                         /* normal completion? */
 364                 if (ep == out_ep)
 365                         f_audio_out_ep_complete(ep, req);
 366                 else if (audio->set_con) {
 367                         memcpy(&data, req->buf, req->length);
 368                         audio->set_con->set(audio->set_con, audio->set_cmd,
 369                                         le16_to_cpu(data));
 370                         audio->set_con = NULL;
 371                 }
 372                 break;
 373         default:
 374                 break;
 375         }
 376 }
 377
 378 static int audio_set_intf_req(struct usb_function *f,
 379                 const struct usb_ctrlrequest *ctrl)
 380 {
 381         struct f_audio          *audio = func_to_audio(f);
 382         struct usb_composite_dev *cdev = f->config->cdev;
 383         struct usb_request      *req = cdev->req;
 384         u8                      id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
 385         u16                     len = le16_to_cpu(ctrl->wLength);
 386         u16                     w_value = le16_to_cpu(ctrl->wValue);
 387         u8                      con_sel = (w_value >> 8) & 0xFF;
 388         u8                      cmd = (ctrl->bRequest & 0x0F);
 389         struct usb_audio_control_selector *cs;
 390         struct usb_audio_control *con;
 391
 392         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
 393                         ctrl->bRequest, w_value, len, id);
 394
 395         list_for_each_entry(cs, &audio->cs, list) {
 396                 if (cs->id == id) {
 397                         list_for_each_entry(con, &cs->control, list) {
 398                                 if (con->type == con_sel) {
 399                                         audio->set_con = con;
 400                                         break;
 401                                 }
 402                         }
 403                         break;
 404                 }
 405         }
 406
 407         audio->set_cmd = cmd;
 408         req->context = audio;
 409         req->complete = f_audio_complete;
 410
 411         return len;
 412 }
 413
 414 static int audio_get_intf_req(struct usb_function *f,
 415                 const struct usb_ctrlrequest *ctrl)
 416 {
 417         struct f_audio          *audio = func_to_audio(f);
 418         struct usb_composite_dev *cdev = f->config->cdev;
 419         struct usb_request      *req = cdev->req;
 420         int                     value = -EOPNOTSUPP;
 421         u8                      id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
 422         u16                     len = le16_to_cpu(ctrl->wLength);
 423         u16                     w_value = le16_to_cpu(ctrl->wValue);
 424         u8                      con_sel = (w_value >> 8) & 0xFF;
 425         u8                      cmd = (ctrl->bRequest & 0x0F);
 426         struct usb_audio_control_selector *cs;
 427         struct usb_audio_control *con;
 428
 429         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
 430                         ctrl->bRequest, w_value, len, id);
 431
 432         list_for_each_entry(cs, &audio->cs, list) {
 433                 if (cs->id == id) {
 434                         list_for_each_entry(con, &cs->control, list) {
 435                                 if (con->type == con_sel && con->get) {
 436                                         value = con->get(con, cmd);
 437                                         break;
 438                                 }
 439                         }
 440                         break;
 441                 }
 442         }
 443
 444         req->context = audio;
 445         req->complete = f_audio_complete;
 446         len = min_t(size_t, sizeof(value), len);
 447         memcpy(req->buf, &value, len);
 448
 449         return len;
 450 }
 451
 452 static int audio_set_endpoint_req(struct usb_function *f,
 453                 const struct usb_ctrlrequest *ctrl)
 454 {
 455         struct usb_composite_dev *cdev = f->config->cdev;
 456         int                     value = -EOPNOTSUPP;
 457         u16                     ep = le16_to_cpu(ctrl->wIndex);
 458         u16                     len = le16_to_cpu(ctrl->wLength);
 459         u16                     w_value = le16_to_cpu(ctrl->wValue);
 460
 461         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 462                         ctrl->bRequest, w_value, len, ep);
 463
 464         switch (ctrl->bRequest) {
 465         case UAC_SET_CUR:
 466                 value = len;
 467                 break;
 468
 469         case UAC_SET_MIN:
 470                 break;
 471
 472         case UAC_SET_MAX:
 473                 break;
 474
 475         case UAC_SET_RES:
 476                 break;
 477
 478         case UAC_SET_MEM:
 479                 break;
 480
 481         default:
 482                 break;
 483         }
 484
 485         return value;
 486 }
 487
 488 static int audio_get_endpoint_req(struct usb_function *f,
 489                 const struct usb_ctrlrequest *ctrl)
 490 {
 491         struct usb_composite_dev *cdev = f->config->cdev;
 492         int value = -EOPNOTSUPP;
 493         u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
 494         u16 len = le16_to_cpu(ctrl->wLength);
 495         u16 w_value = le16_to_cpu(ctrl->wValue);
 496
 497         DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
 498                         ctrl->bRequest, w_value, len, ep);
 499
 500         switch (ctrl->bRequest) {
 501         case UAC_GET_CUR:
 502         case UAC_GET_MIN:
 503         case UAC_GET_MAX:
 504         case UAC_GET_RES:
 505                 value = len;
 506                 break;
 507         case UAC_GET_MEM:
 508                 break;
 509         default:
 510                 break;
 511         }
 512
 513         return value;
 514 }
 515
 516 static int
 517 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 518 {
 519         struct usb_composite_dev *cdev = f->config->cdev;
 520         struct usb_request      *req = cdev->req;
 521         int                     value = -EOPNOTSUPP;
 522         u16                     w_index = le16_to_cpu(ctrl->wIndex);
 523         u16                     w_value = le16_to_cpu(ctrl->wValue);
 524         u16                     w_length = le16_to_cpu(ctrl->wLength);
 525
 526         /* composite driver infrastructure handles everything; interface
 527          * activation uses set_alt().
 528          */
 529         switch (ctrl->bRequestType) {
 530         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 531                 value = audio_set_intf_req(f, ctrl);
 532                 break;
 533
 534         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
 535                 value = audio_get_intf_req(f, ctrl);
 536                 break;
 537
 538         case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 539                 value = audio_set_endpoint_req(f, ctrl);
 540                 break;
 541
 542         case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
 543                 value = audio_get_endpoint_req(f, ctrl);
 544                 break;
 545
 546         default:
 547                 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
 548                         ctrl->bRequestType, ctrl->bRequest,
 549                         w_value, w_index, w_length);
 550         }
 551
 552         /* respond with data transfer or status phase? */
 553         if (value >= 0) {
 554                 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
 555                         ctrl->bRequestType, ctrl->bRequest,
 556                         w_value, w_index, w_length);
 557                 req->zero = 0;
 558                 req->length = value;
 559                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
 560                 if (value < 0)
 561                         ERROR(cdev, "audio response on err %d\n", value);
 562         }
 563
 564         /* device either stalls (value < 0) or reports success */
 565         return value;
 566 }
 567
 568 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 569 {
 570         struct f_audio          *audio = func_to_audio(f);
 571         struct usb_composite_dev *cdev = f->config->cdev;
 572         struct usb_ep *out_ep = audio->out_ep;
 573         struct usb_request *req;
 574         struct f_uac1_opts *opts;
 575         int req_buf_size, req_count, audio_buf_size;
 576         int i = 0, err = 0;
 577
 578         DBG(cdev, "intf %d, alt %d\n", intf, alt);
 579
 580         opts = container_of(f->fi, struct f_uac1_opts, func_inst);
 581         req_buf_size = opts->req_buf_size;
 582         req_count = opts->req_count;
 583         audio_buf_size = opts->audio_buf_size;
 584
 585         if (intf == 1) {
 586                 if (alt == 1) {
 587                         usb_ep_enable(out_ep);
 588                         out_ep->driver_data = audio;
 589                         audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
 590                         if (IS_ERR(audio->copy_buf))
 591                                 return -ENOMEM;
 592
 593                         /*
 594                          * allocate a bunch of read buffers
 595                          * and queue them all at once.
 596                          */
 597                         for (i = 0; i < req_count && err == 0; i++) {
 598                                 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
 599                                 if (req) {
 600                                         req->buf = kzalloc(req_buf_size,
 601                                                         GFP_ATOMIC);
 602                                         if (req->buf) {
 603                                                 req->length = req_buf_size;
 604                                                 req->context = audio;
 605                                                 req->complete =
 606                                                         f_audio_complete;
 607                                                 err = usb_ep_queue(out_ep,
 608                                                         req, GFP_ATOMIC);
 609                                                 if (err)
 610                                                         ERROR(cdev,
 611                                                         "%s queue req: %d\n",
 612                                                         out_ep->name, err);
 613                                         } else
 614                                                 err = -ENOMEM;
 615                                 } else
 616                                         err = -ENOMEM;
 617                         }
 618
 619                 } else {
 620                         struct f_audio_buf *copy_buf = audio->copy_buf;
 621                         if (copy_buf) {
 622                                 list_add_tail(&copy_buf->list,
 623                                                 &audio->play_queue);
 624                                 schedule_work(&audio->playback_work);
 625                         }
 626                 }
 627         }
 628
 629         return err;
 630 }
 631
 632 static void f_audio_disable(struct usb_function *f)
 633 {
 634         return;
 635 }
 636
 637 /*-------------------------------------------------------------------------*/
 638
 639 static void f_audio_build_desc(struct f_audio *audio)
 640 {
 641         struct gaudio *card = &audio->card;
 642         u8 *sam_freq;
 643         int rate;
 644
 645         /* Set channel numbers */
 646         input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
 647         as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
 648
 649         /* Set sample rates */
 650         rate = u_audio_get_playback_rate(card);
 651         sam_freq = as_type_i_desc.tSamFreq[0];
 652         memcpy(sam_freq, &rate, 3);
 653
 654         /* Todo: Set Sample bits and other parameters */
 655
 656         return;
 657 }
 658
 659 /* audio function driver setup/binding */
 660 static int
 661 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 662 {
 663         struct usb_composite_dev *cdev = c->cdev;
 664         struct f_audio          *audio = func_to_audio(f);
 665         struct usb_string       *us;
 666         int                     status;
 667         struct usb_ep           *ep = NULL;
 668         struct f_uac1_opts      *audio_opts;
 669
 670         audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
 671         audio->card.gadget = c->cdev->gadget;
 672         audio_opts->card = &audio->card;
 673         /* set up ASLA audio devices */
 674         if (!audio_opts->bound) {
 675                 status = gaudio_setup(&audio->card);
 676                 if (status < 0)
 677                         return status;
 678                 audio_opts->bound = true;
 679         }
 680         us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
 681         if (IS_ERR(us))
 682                 return PTR_ERR(us);
 683         ac_interface_desc.iInterface = us[STR_AC_IF].id;
 684         input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
 685         input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
 686         feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
 687         output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
 688         as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
 689         as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
 690
 691
 692         f_audio_build_desc(audio);
 693
 694         /* allocate instance-specific interface IDs, and patch descriptors */
 695         status = usb_interface_id(c, f);
 696         if (status < 0)
 697                 goto fail;
 698         ac_interface_desc.bInterfaceNumber = status;
 699
 700         status = usb_interface_id(c, f);
 701         if (status < 0)
 702                 goto fail;
 703         as_interface_alt_0_desc.bInterfaceNumber = status;
 704         as_interface_alt_1_desc.bInterfaceNumber = status;
 705
 706         status = -ENODEV;
 707
 708         /* allocate instance-specific endpoints */
 709         ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
 710         if (!ep)
 711                 goto fail;
 712         audio->out_ep = ep;
 713         audio->out_ep->desc = &as_out_ep_desc;
 714         ep->driver_data = cdev; /* claim */
 715
 716         status = -ENOMEM;
 717
 718         /* copy descriptors, and track endpoint copies */
 719         status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL);
 720         if (status)
 721                 goto fail;
 722         return 0;
 723
 724 fail:
 725         gaudio_cleanup(&audio->card);
 726         if (ep)
 727                 ep->driver_data = NULL;
 728         return status;
 729 }
 730
 731 /*-------------------------------------------------------------------------*/
 732
 733 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
 734 {
 735         con->data[cmd] = value;
 736
 737         return 0;
 738 }
 739
 740 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
 741 {
 742         return con->data[cmd];
 743 }
 744
 745 /* Todo: add more control selecotor dynamically */
 746 static int control_selector_init(struct f_audio *audio)
 747 {
 748         INIT_LIST_HEAD(&audio->cs);
 749         list_add(&feature_unit.list, &audio->cs);
 750
 751         INIT_LIST_HEAD(&feature_unit.control);
 752         list_add(&mute_control.list, &feature_unit.control);
 753         list_add(&volume_control.list, &feature_unit.control);
 754
 755         volume_control.data[UAC__CUR] = 0xffc0;
 756         volume_control.data[UAC__MIN] = 0xe3a0;
 757         volume_control.data[UAC__MAX] = 0xfff0;
 758         volume_control.data[UAC__RES] = 0x0030;
 759
 760         return 0;
 761 }
 762
 763 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
 764 {
 765         return container_of(to_config_group(item), struct f_uac1_opts,
 766                             func_inst.group);
 767 }
 768
 769 CONFIGFS_ATTR_STRUCT(f_uac1_opts);
 770 CONFIGFS_ATTR_OPS(f_uac1_opts);
 771
 772 static void f_uac1_attr_release(struct config_item *item)
 773 {
 774         struct f_uac1_opts *opts = to_f_uac1_opts(item);
 775
 776         usb_put_function_instance(&opts->func_inst);
 777 }
 778
 779 static struct configfs_item_operations f_uac1_item_ops = {
 780         .release        = f_uac1_attr_release,
 781         .show_attribute = f_uac1_opts_attr_show,
 782         .store_attribute = f_uac1_opts_attr_store,
 783 };
 784
 785 #define UAC1_INT_ATTRIBUTE(name)                                        \
 786 static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts,      \
 787                                          char *page)                    \
 788 {                                                                       \
 789         int result;                                                     \
 790                                                                         \
 791         mutex_lock(&opts->lock);                                        \
 792         result = sprintf(page, "%u\n", opts->name);                     \
 793         mutex_unlock(&opts->lock);                                      \
 794                                                                         \
 795         return result;                                                  \
 796 }                                                                       \
 797                                                                         \
 798 static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts,     \
 799                                           const char *page, size_t len) \
 800 {                                                                       \
 801         int ret;                                                        \
 802         u32 num;                                                        \
 803                                                                         \
 804         mutex_lock(&opts->lock);                                        \
 805         if (opts->refcnt) {                                             \
 806                 ret = -EBUSY;                                           \
 807                 goto end;                                               \
 808         }                                                               \
 809                                                                         \
 810         ret = kstrtou32(page, 0, &num);                                 \
 811         if (ret)                                                        \
 812                 goto end;                                               \
 813                                                                         \
 814         opts->name = num;                                               \
 815         ret = len;                                                      \
 816                                                                         \
 817 end:                                                                    \
 818         mutex_unlock(&opts->lock);                                      \
 819         return ret;                                                     \
 820 }                                                                       \
 821                                                                         \
 822 static struct f_uac1_opts_attribute f_uac1_opts_##name =                \
 823         __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR,                        \
 824                         f_uac1_opts_##name##_show,                      \
 825                         f_uac1_opts_##name##_store)
 826
 827 UAC1_INT_ATTRIBUTE(req_buf_size);
 828 UAC1_INT_ATTRIBUTE(req_count);
 829 UAC1_INT_ATTRIBUTE(audio_buf_size);
 830
 831 #define UAC1_STR_ATTRIBUTE(name)                                        \
 832 static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts,      \
 833                                          char *page)                    \
 834 {                                                                       \
 835         int result;                                                     \
 836                                                                         \
 837         mutex_lock(&opts->lock);                                        \
 838         result = sprintf(page, "%s\n", opts->name);                     \
 839         mutex_unlock(&opts->lock);                                      \
 840                                                                         \
 841         return result;                                                  \
 842 }                                                                       \
 843                                                                         \
 844 static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts,     \
 845                                           const char *page, size_t len) \
 846 {                                                                       \
 847         int ret = -EBUSY;                                               \
 848         char *tmp;                                                      \
 849                                                                         \
 850         mutex_lock(&opts->lock);                                        \
 851         if (opts->refcnt)                                               \
 852                 goto end;                                               \
 853                                                                         \
 854         tmp = kstrndup(page, len, GFP_KERNEL);                          \
 855         if (tmp) {                                                      \
 856                 ret = -ENOMEM;                                          \
 857                 goto end;                                               \
 858         }                                                               \
 859         if (opts->name##_alloc)                                         \
 860                 kfree(opts->name);                                      \
 861         opts->name##_alloc = true;                                      \
 862         opts->name = tmp;                                               \
 863         ret = len;                                                      \
 864                                                                         \
 865 end:                                                                    \
 866         mutex_unlock(&opts->lock);                                      \
 867         return ret;                                                     \
 868 }                                                                       \
 869                                                                         \
 870 static struct f_uac1_opts_attribute f_uac1_opts_##name =                \
 871         __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR,                        \
 872                         f_uac1_opts_##name##_show,                      \
 873                         f_uac1_opts_##name##_store)
 874
 875 UAC1_STR_ATTRIBUTE(fn_play);
 876 UAC1_STR_ATTRIBUTE(fn_cap);
 877 UAC1_STR_ATTRIBUTE(fn_cntl);
 878
 879 static struct configfs_attribute *f_uac1_attrs[] = {
 880         &f_uac1_opts_req_buf_size.attr,
 881         &f_uac1_opts_req_count.attr,
 882         &f_uac1_opts_audio_buf_size.attr,
 883         &f_uac1_opts_fn_play.attr,
 884         &f_uac1_opts_fn_cap.attr,
 885         &f_uac1_opts_fn_cntl.attr,
 886         NULL,
 887 };
 888
 889 static struct config_item_type f_uac1_func_type = {
 890         .ct_item_ops    = &f_uac1_item_ops,
 891         .ct_attrs       = f_uac1_attrs,
 892         .ct_owner       = THIS_MODULE,
 893 };
 894
 895 static void f_audio_free_inst(struct usb_function_instance *f)
 896 {
 897         struct f_uac1_opts *opts;
 898
 899         opts = container_of(f, struct f_uac1_opts, func_inst);
 900         if (opts->fn_play_alloc)
 901                 kfree(opts->fn_play);
 902         if (opts->fn_cap_alloc)
 903                 kfree(opts->fn_cap);
 904         if (opts->fn_cntl_alloc)
 905                 kfree(opts->fn_cntl);
 906         kfree(opts);
 907 }
 908
 909 static struct usb_function_instance *f_audio_alloc_inst(void)
 910 {
 911         struct f_uac1_opts *opts;
 912
 913         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
 914         if (!opts)
 915                 return ERR_PTR(-ENOMEM);
 916
 917         mutex_init(&opts->lock);
 918         opts->func_inst.free_func_inst = f_audio_free_inst;
 919
 920         config_group_init_type_name(&opts->func_inst.group, "",
 921                                     &f_uac1_func_type);
 922
 923         opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
 924         opts->req_count = UAC1_REQ_COUNT;
 925         opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
 926         opts->fn_play = FILE_PCM_PLAYBACK;
 927         opts->fn_cap = FILE_PCM_CAPTURE;
 928         opts->fn_cntl = FILE_CONTROL;
 929         return &opts->func_inst;
 930 }
 931
 932 static void f_audio_free(struct usb_function *f)
 933 {
 934         struct f_audio *audio = func_to_audio(f);
 935         struct f_uac1_opts *opts;
 936
 937         gaudio_cleanup(&audio->card);
 938         opts = container_of(f->fi, struct f_uac1_opts, func_inst);
 939         kfree(audio);
 940         mutex_lock(&opts->lock);
 941         --opts->refcnt;
 942         mutex_unlock(&opts->lock);
 943 }
 944
 945 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
 946 {
 947         usb_free_all_descriptors(f);
 948 }
 949
 950 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
 951 {
 952         struct f_audio *audio;
 953         struct f_uac1_opts *opts;
 954
 955         /* allocate and initialize one new instance */
 956         audio = kzalloc(sizeof(*audio), GFP_KERNEL);
 957         if (!audio)
 958                 return ERR_PTR(-ENOMEM);
 959
 960         audio->card.func.name = "g_audio";
 961
 962         opts = container_of(fi, struct f_uac1_opts, func_inst);
 963         mutex_lock(&opts->lock);
 964         ++opts->refcnt;
 965         mutex_unlock(&opts->lock);
 966         INIT_LIST_HEAD(&audio->play_queue);
 967         spin_lock_init(&audio->lock);
 968
 969         audio->card.func.bind = f_audio_bind;
 970         audio->card.func.unbind = f_audio_unbind;
 971         audio->card.func.set_alt = f_audio_set_alt;
 972         audio->card.func.setup = f_audio_setup;
 973         audio->card.func.disable = f_audio_disable;
 974         audio->card.func.free_func = f_audio_free;
 975
 976         control_selector_init(audio);
 977
 978         INIT_WORK(&audio->playback_work, f_audio_playback_work);
 979
 980         return &audio->card.func;
 981 }
 982
 983 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
 984 MODULE_LICENSE("GPL");
 985 MODULE_AUTHOR("Bryan Wu");