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/device.h> 15 #include <linux/atomic.h> 16 17 #include "u_uac1.h" 18 19 #define OUT_EP_MAX_PACKET_SIZE 200 20 static int req_buf_size = OUT_EP_MAX_PACKET_SIZE; 21 module_param(req_buf_size, int, S_IRUGO); 22 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size"); 23 24 static int req_count = 256; 25 module_param(req_count, int, S_IRUGO); 26 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count"); 27 28 static int audio_buf_size = 48000; 29 module_param(audio_buf_size, int, S_IRUGO); 30 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size"); 31 32 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); 33 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd); 34 35 /* 36 * DESCRIPTORS ... most are static, but strings and full 37 * configuration descriptors are built on demand. 38 */ 39 40 /* 41 * We have two interfaces- AudioControl and AudioStreaming 42 * TODO: only supcard playback currently 43 */ 44 #define F_AUDIO_AC_INTERFACE 0 45 #define F_AUDIO_AS_INTERFACE 1 46 #define F_AUDIO_NUM_INTERFACES 2 47 48 /* B.3.1 Standard AC Interface Descriptor */ 49 static struct usb_interface_descriptor ac_interface_desc __initdata = { 50 .bLength = USB_DT_INTERFACE_SIZE, 51 .bDescriptorType = USB_DT_INTERFACE, 52 .bNumEndpoints = 0, 53 .bInterfaceClass = USB_CLASS_AUDIO, 54 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 55 }; 56 57 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2); 58 59 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) 60 /* 1 input terminal, 1 output terminal and 1 feature unit */ 61 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \ 62 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0)) 63 /* B.3.2 Class-Specific AC Interface Descriptor */ 64 static struct uac1_ac_header_descriptor_2 ac_header_desc = { 65 .bLength = UAC_DT_AC_HEADER_LENGTH, 66 .bDescriptorType = USB_DT_CS_INTERFACE, 67 .bDescriptorSubtype = UAC_HEADER, 68 .bcdADC = __constant_cpu_to_le16(0x0100), 69 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH), 70 .bInCollection = F_AUDIO_NUM_INTERFACES, 71 .baInterfaceNr = { 72 [0] = F_AUDIO_AC_INTERFACE, 73 [1] = F_AUDIO_AS_INTERFACE, 74 } 75 }; 76 77 #define INPUT_TERMINAL_ID 1 78 static struct uac_input_terminal_descriptor input_terminal_desc = { 79 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 80 .bDescriptorType = USB_DT_CS_INTERFACE, 81 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 82 .bTerminalID = INPUT_TERMINAL_ID, 83 .wTerminalType = UAC_TERMINAL_STREAMING, 84 .bAssocTerminal = 0, 85 .wChannelConfig = 0x3, 86 }; 87 88 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); 89 90 #define FEATURE_UNIT_ID 2 91 static struct uac_feature_unit_descriptor_0 feature_unit_desc = { 92 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0), 93 .bDescriptorType = USB_DT_CS_INTERFACE, 94 .bDescriptorSubtype = UAC_FEATURE_UNIT, 95 .bUnitID = FEATURE_UNIT_ID, 96 .bSourceID = INPUT_TERMINAL_ID, 97 .bControlSize = 2, 98 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME), 99 }; 100 101 static struct usb_audio_control mute_control = { 102 .list = LIST_HEAD_INIT(mute_control.list), 103 .name = "Mute Control", 104 .type = UAC_FU_MUTE, 105 /* Todo: add real Mute control code */ 106 .set = generic_set_cmd, 107 .get = generic_get_cmd, 108 }; 109 110 static struct usb_audio_control volume_control = { 111 .list = LIST_HEAD_INIT(volume_control.list), 112 .name = "Volume Control", 113 .type = UAC_FU_VOLUME, 114 /* Todo: add real Volume control code */ 115 .set = generic_set_cmd, 116 .get = generic_get_cmd, 117 }; 118 119 static struct usb_audio_control_selector feature_unit = { 120 .list = LIST_HEAD_INIT(feature_unit.list), 121 .id = FEATURE_UNIT_ID, 122 .name = "Mute & Volume Control", 123 .type = UAC_FEATURE_UNIT, 124 .desc = (struct usb_descriptor_header *)&feature_unit_desc, 125 }; 126 127 #define OUTPUT_TERMINAL_ID 3 128 static struct uac1_output_terminal_descriptor output_terminal_desc = { 129 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 130 .bDescriptorType = USB_DT_CS_INTERFACE, 131 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 132 .bTerminalID = OUTPUT_TERMINAL_ID, 133 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, 134 .bAssocTerminal = FEATURE_UNIT_ID, 135 .bSourceID = FEATURE_UNIT_ID, 136 }; 137 138 /* B.4.1 Standard AS Interface Descriptor */ 139 static struct usb_interface_descriptor as_interface_alt_0_desc = { 140 .bLength = USB_DT_INTERFACE_SIZE, 141 .bDescriptorType = USB_DT_INTERFACE, 142 .bAlternateSetting = 0, 143 .bNumEndpoints = 0, 144 .bInterfaceClass = USB_CLASS_AUDIO, 145 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 146 }; 147 148 static struct usb_interface_descriptor as_interface_alt_1_desc = { 149 .bLength = USB_DT_INTERFACE_SIZE, 150 .bDescriptorType = USB_DT_INTERFACE, 151 .bAlternateSetting = 1, 152 .bNumEndpoints = 1, 153 .bInterfaceClass = USB_CLASS_AUDIO, 154 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 155 }; 156 157 /* B.4.2 Class-Specific AS Interface Descriptor */ 158 static struct uac1_as_header_descriptor as_header_desc = { 159 .bLength = UAC_DT_AS_HEADER_SIZE, 160 .bDescriptorType = USB_DT_CS_INTERFACE, 161 .bDescriptorSubtype = UAC_AS_GENERAL, 162 .bTerminalLink = INPUT_TERMINAL_ID, 163 .bDelay = 1, 164 .wFormatTag = UAC_FORMAT_TYPE_I_PCM, 165 }; 166 167 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); 168 169 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = { 170 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), 171 .bDescriptorType = USB_DT_CS_INTERFACE, 172 .bDescriptorSubtype = UAC_FORMAT_TYPE, 173 .bFormatType = UAC_FORMAT_TYPE_I, 174 .bSubframeSize = 2, 175 .bBitResolution = 16, 176 .bSamFreqType = 1, 177 }; 178 179 /* Standard ISO OUT Endpoint Descriptor */ 180 static struct usb_endpoint_descriptor as_out_ep_desc = { 181 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 182 .bDescriptorType = USB_DT_ENDPOINT, 183 .bEndpointAddress = USB_DIR_OUT, 184 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE 185 | USB_ENDPOINT_XFER_ISOC, 186 .wMaxPacketSize = __constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE), 187 .bInterval = 4, 188 }; 189 190 /* Class-specific AS ISO OUT Endpoint Descriptor */ 191 static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = { 192 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 193 .bDescriptorType = USB_DT_CS_ENDPOINT, 194 .bDescriptorSubtype = UAC_EP_GENERAL, 195 .bmAttributes = 1, 196 .bLockDelayUnits = 1, 197 .wLockDelay = __constant_cpu_to_le16(1), 198 }; 199 200 static struct usb_descriptor_header *f_audio_desc[] __initdata = { 201 (struct usb_descriptor_header *)&ac_interface_desc, 202 (struct usb_descriptor_header *)&ac_header_desc, 203 204 (struct usb_descriptor_header *)&input_terminal_desc, 205 (struct usb_descriptor_header *)&output_terminal_desc, 206 (struct usb_descriptor_header *)&feature_unit_desc, 207 208 (struct usb_descriptor_header *)&as_interface_alt_0_desc, 209 (struct usb_descriptor_header *)&as_interface_alt_1_desc, 210 (struct usb_descriptor_header *)&as_header_desc, 211 212 (struct usb_descriptor_header *)&as_type_i_desc, 213 214 (struct usb_descriptor_header *)&as_out_ep_desc, 215 (struct usb_descriptor_header *)&as_iso_out_desc, 216 NULL, 217 }; 218 219 /* 220 * This function is an ALSA sound card following USB Audio Class Spec 1.0. 221 */ 222 223 /*-------------------------------------------------------------------------*/ 224 struct f_audio_buf { 225 u8 *buf; 226 int actual; 227 struct list_head list; 228 }; 229 230 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) 231 { 232 struct f_audio_buf *copy_buf; 233 234 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC); 235 if (!copy_buf) 236 return ERR_PTR(-ENOMEM); 237 238 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); 239 if (!copy_buf->buf) { 240 kfree(copy_buf); 241 return ERR_PTR(-ENOMEM); 242 } 243 244 return copy_buf; 245 } 246 247 static void f_audio_buffer_free(struct f_audio_buf *audio_buf) 248 { 249 kfree(audio_buf->buf); 250 kfree(audio_buf); 251 } 252 /*-------------------------------------------------------------------------*/ 253 254 struct f_audio { 255 struct gaudio card; 256 257 /* endpoints handle full and/or high speeds */ 258 struct usb_ep *out_ep; 259 260 spinlock_t lock; 261 struct f_audio_buf *copy_buf; 262 struct work_struct playback_work; 263 struct list_head play_queue; 264 265 /* Control Set command */ 266 struct list_head cs; 267 u8 set_cmd; 268 struct usb_audio_control *set_con; 269 }; 270 271 static inline struct f_audio *func_to_audio(struct usb_function *f) 272 { 273 return container_of(f, struct f_audio, card.func); 274 } 275 276 /*-------------------------------------------------------------------------*/ 277 278 static void f_audio_playback_work(struct work_struct *data) 279 { 280 struct f_audio *audio = container_of(data, struct f_audio, 281 playback_work); 282 struct f_audio_buf *play_buf; 283 284 spin_lock_irq(&audio->lock); 285 if (list_empty(&audio->play_queue)) { 286 spin_unlock_irq(&audio->lock); 287 return; 288 } 289 play_buf = list_first_entry(&audio->play_queue, 290 struct f_audio_buf, list); 291 list_del(&play_buf->list); 292 spin_unlock_irq(&audio->lock); 293 294 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual); 295 f_audio_buffer_free(play_buf); 296 } 297 298 static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req) 299 { 300 struct f_audio *audio = req->context; 301 struct usb_composite_dev *cdev = audio->card.func.config->cdev; 302 struct f_audio_buf *copy_buf = audio->copy_buf; 303 int err; 304 305 if (!copy_buf) 306 return -EINVAL; 307 308 /* Copy buffer is full, add it to the play_queue */ 309 if (audio_buf_size - copy_buf->actual < req->actual) { 310 list_add_tail(©_buf->list, &audio->play_queue); 311 schedule_work(&audio->playback_work); 312 copy_buf = f_audio_buffer_alloc(audio_buf_size); 313 if (IS_ERR(copy_buf)) 314 return -ENOMEM; 315 } 316 317 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); 318 copy_buf->actual += req->actual; 319 audio->copy_buf = copy_buf; 320 321 err = usb_ep_queue(ep, req, GFP_ATOMIC); 322 if (err) 323 ERROR(cdev, "%s queue req: %d\n", ep->name, err); 324 325 return 0; 326 327 } 328 329 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) 330 { 331 struct f_audio *audio = req->context; 332 int status = req->status; 333 u32 data = 0; 334 struct usb_ep *out_ep = audio->out_ep; 335 336 switch (status) { 337 338 case 0: /* normal completion? */ 339 if (ep == out_ep) 340 f_audio_out_ep_complete(ep, req); 341 else if (audio->set_con) { 342 memcpy(&data, req->buf, req->length); 343 audio->set_con->set(audio->set_con, audio->set_cmd, 344 le16_to_cpu(data)); 345 audio->set_con = NULL; 346 } 347 break; 348 default: 349 break; 350 } 351 } 352 353 static int audio_set_intf_req(struct usb_function *f, 354 const struct usb_ctrlrequest *ctrl) 355 { 356 struct f_audio *audio = func_to_audio(f); 357 struct usb_composite_dev *cdev = f->config->cdev; 358 struct usb_request *req = cdev->req; 359 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 360 u16 len = le16_to_cpu(ctrl->wLength); 361 u16 w_value = le16_to_cpu(ctrl->wValue); 362 u8 con_sel = (w_value >> 8) & 0xFF; 363 u8 cmd = (ctrl->bRequest & 0x0F); 364 struct usb_audio_control_selector *cs; 365 struct usb_audio_control *con; 366 367 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 368 ctrl->bRequest, w_value, len, id); 369 370 list_for_each_entry(cs, &audio->cs, list) { 371 if (cs->id == id) { 372 list_for_each_entry(con, &cs->control, list) { 373 if (con->type == con_sel) { 374 audio->set_con = con; 375 break; 376 } 377 } 378 break; 379 } 380 } 381 382 audio->set_cmd = cmd; 383 req->context = audio; 384 req->complete = f_audio_complete; 385 386 return len; 387 } 388 389 static int audio_get_intf_req(struct usb_function *f, 390 const struct usb_ctrlrequest *ctrl) 391 { 392 struct f_audio *audio = func_to_audio(f); 393 struct usb_composite_dev *cdev = f->config->cdev; 394 struct usb_request *req = cdev->req; 395 int value = -EOPNOTSUPP; 396 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 397 u16 len = le16_to_cpu(ctrl->wLength); 398 u16 w_value = le16_to_cpu(ctrl->wValue); 399 u8 con_sel = (w_value >> 8) & 0xFF; 400 u8 cmd = (ctrl->bRequest & 0x0F); 401 struct usb_audio_control_selector *cs; 402 struct usb_audio_control *con; 403 404 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 405 ctrl->bRequest, w_value, len, id); 406 407 list_for_each_entry(cs, &audio->cs, list) { 408 if (cs->id == id) { 409 list_for_each_entry(con, &cs->control, list) { 410 if (con->type == con_sel && con->get) { 411 value = con->get(con, cmd); 412 break; 413 } 414 } 415 break; 416 } 417 } 418 419 req->context = audio; 420 req->complete = f_audio_complete; 421 len = min_t(size_t, sizeof(value), len); 422 memcpy(req->buf, &value, len); 423 424 return len; 425 } 426 427 static int audio_set_endpoint_req(struct usb_function *f, 428 const struct usb_ctrlrequest *ctrl) 429 { 430 struct usb_composite_dev *cdev = f->config->cdev; 431 int value = -EOPNOTSUPP; 432 u16 ep = le16_to_cpu(ctrl->wIndex); 433 u16 len = le16_to_cpu(ctrl->wLength); 434 u16 w_value = le16_to_cpu(ctrl->wValue); 435 436 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 437 ctrl->bRequest, w_value, len, ep); 438 439 switch (ctrl->bRequest) { 440 case UAC_SET_CUR: 441 value = len; 442 break; 443 444 case UAC_SET_MIN: 445 break; 446 447 case UAC_SET_MAX: 448 break; 449 450 case UAC_SET_RES: 451 break; 452 453 case UAC_SET_MEM: 454 break; 455 456 default: 457 break; 458 } 459 460 return value; 461 } 462 463 static int audio_get_endpoint_req(struct usb_function *f, 464 const struct usb_ctrlrequest *ctrl) 465 { 466 struct usb_composite_dev *cdev = f->config->cdev; 467 int value = -EOPNOTSUPP; 468 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 469 u16 len = le16_to_cpu(ctrl->wLength); 470 u16 w_value = le16_to_cpu(ctrl->wValue); 471 472 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 473 ctrl->bRequest, w_value, len, ep); 474 475 switch (ctrl->bRequest) { 476 case UAC_GET_CUR: 477 case UAC_GET_MIN: 478 case UAC_GET_MAX: 479 case UAC_GET_RES: 480 value = len; 481 break; 482 case UAC_GET_MEM: 483 break; 484 default: 485 break; 486 } 487 488 return value; 489 } 490 491 static int 492 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 493 { 494 struct usb_composite_dev *cdev = f->config->cdev; 495 struct usb_request *req = cdev->req; 496 int value = -EOPNOTSUPP; 497 u16 w_index = le16_to_cpu(ctrl->wIndex); 498 u16 w_value = le16_to_cpu(ctrl->wValue); 499 u16 w_length = le16_to_cpu(ctrl->wLength); 500 501 /* composite driver infrastructure handles everything; interface 502 * activation uses set_alt(). 503 */ 504 switch (ctrl->bRequestType) { 505 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 506 value = audio_set_intf_req(f, ctrl); 507 break; 508 509 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 510 value = audio_get_intf_req(f, ctrl); 511 break; 512 513 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 514 value = audio_set_endpoint_req(f, ctrl); 515 break; 516 517 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 518 value = audio_get_endpoint_req(f, ctrl); 519 break; 520 521 default: 522 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", 523 ctrl->bRequestType, ctrl->bRequest, 524 w_value, w_index, w_length); 525 } 526 527 /* respond with data transfer or status phase? */ 528 if (value >= 0) { 529 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", 530 ctrl->bRequestType, ctrl->bRequest, 531 w_value, w_index, w_length); 532 req->zero = 0; 533 req->length = value; 534 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 535 if (value < 0) 536 ERROR(cdev, "audio response on err %d\n", value); 537 } 538 539 /* device either stalls (value < 0) or reports success */ 540 return value; 541 } 542 543 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 544 { 545 struct f_audio *audio = func_to_audio(f); 546 struct usb_composite_dev *cdev = f->config->cdev; 547 struct usb_ep *out_ep = audio->out_ep; 548 struct usb_request *req; 549 int i = 0, err = 0; 550 551 DBG(cdev, "intf %d, alt %d\n", intf, alt); 552 553 if (intf == 1) { 554 if (alt == 1) { 555 usb_ep_enable(out_ep); 556 out_ep->driver_data = audio; 557 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); 558 if (IS_ERR(audio->copy_buf)) 559 return -ENOMEM; 560 561 /* 562 * allocate a bunch of read buffers 563 * and queue them all at once. 564 */ 565 for (i = 0; i < req_count && err == 0; i++) { 566 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); 567 if (req) { 568 req->buf = kzalloc(req_buf_size, 569 GFP_ATOMIC); 570 if (req->buf) { 571 req->length = req_buf_size; 572 req->context = audio; 573 req->complete = 574 f_audio_complete; 575 err = usb_ep_queue(out_ep, 576 req, GFP_ATOMIC); 577 if (err) 578 ERROR(cdev, 579 "%s queue req: %d\n", 580 out_ep->name, err); 581 } else 582 err = -ENOMEM; 583 } else 584 err = -ENOMEM; 585 } 586 587 } else { 588 struct f_audio_buf *copy_buf = audio->copy_buf; 589 if (copy_buf) { 590 list_add_tail(©_buf->list, 591 &audio->play_queue); 592 schedule_work(&audio->playback_work); 593 } 594 } 595 } 596 597 return err; 598 } 599 600 static void f_audio_disable(struct usb_function *f) 601 { 602 return; 603 } 604 605 /*-------------------------------------------------------------------------*/ 606 607 static void f_audio_build_desc(struct f_audio *audio) 608 { 609 struct gaudio *card = &audio->card; 610 u8 *sam_freq; 611 int rate; 612 613 /* Set channel numbers */ 614 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); 615 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); 616 617 /* Set sample rates */ 618 rate = u_audio_get_playback_rate(card); 619 sam_freq = as_type_i_desc.tSamFreq[0]; 620 memcpy(sam_freq, &rate, 3); 621 622 /* Todo: Set Sample bits and other parameters */ 623 624 return; 625 } 626 627 /* audio function driver setup/binding */ 628 static int __init 629 f_audio_bind(struct usb_configuration *c, struct usb_function *f) 630 { 631 struct usb_composite_dev *cdev = c->cdev; 632 struct f_audio *audio = func_to_audio(f); 633 int status; 634 struct usb_ep *ep = NULL; 635 636 f_audio_build_desc(audio); 637 638 /* allocate instance-specific interface IDs, and patch descriptors */ 639 status = usb_interface_id(c, f); 640 if (status < 0) 641 goto fail; 642 ac_interface_desc.bInterfaceNumber = status; 643 644 status = usb_interface_id(c, f); 645 if (status < 0) 646 goto fail; 647 as_interface_alt_0_desc.bInterfaceNumber = status; 648 as_interface_alt_1_desc.bInterfaceNumber = status; 649 650 status = -ENODEV; 651 652 /* allocate instance-specific endpoints */ 653 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 654 if (!ep) 655 goto fail; 656 audio->out_ep = ep; 657 audio->out_ep->desc = &as_out_ep_desc; 658 ep->driver_data = cdev; /* claim */ 659 660 status = -ENOMEM; 661 662 /* copy descriptors, and track endpoint copies */ 663 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL); 664 if (status) 665 goto fail; 666 return 0; 667 668 fail: 669 if (ep) 670 ep->driver_data = NULL; 671 return status; 672 } 673 674 static void 675 f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 676 { 677 struct f_audio *audio = func_to_audio(f); 678 679 usb_free_all_descriptors(f); 680 kfree(audio); 681 } 682 683 /*-------------------------------------------------------------------------*/ 684 685 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) 686 { 687 con->data[cmd] = value; 688 689 return 0; 690 } 691 692 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) 693 { 694 return con->data[cmd]; 695 } 696 697 /* Todo: add more control selecotor dynamically */ 698 static int __init control_selector_init(struct f_audio *audio) 699 { 700 INIT_LIST_HEAD(&audio->cs); 701 list_add(&feature_unit.list, &audio->cs); 702 703 INIT_LIST_HEAD(&feature_unit.control); 704 list_add(&mute_control.list, &feature_unit.control); 705 list_add(&volume_control.list, &feature_unit.control); 706 707 volume_control.data[UAC__CUR] = 0xffc0; 708 volume_control.data[UAC__MIN] = 0xe3a0; 709 volume_control.data[UAC__MAX] = 0xfff0; 710 volume_control.data[UAC__RES] = 0x0030; 711 712 return 0; 713 } 714 715 /** 716 * audio_bind_config - add USB audio function to a configuration 717 * @c: the configuration to supcard the USB audio function 718 * Context: single threaded during gadget setup 719 * 720 * Returns zero on success, else negative errno. 721 */ 722 static int __init audio_bind_config(struct usb_configuration *c) 723 { 724 struct f_audio *audio; 725 int status; 726 727 /* allocate and initialize one new instance */ 728 audio = kzalloc(sizeof *audio, GFP_KERNEL); 729 if (!audio) 730 return -ENOMEM; 731 732 audio->card.func.name = "g_audio"; 733 audio->card.gadget = c->cdev->gadget; 734 735 INIT_LIST_HEAD(&audio->play_queue); 736 spin_lock_init(&audio->lock); 737 738 /* set up ASLA audio devices */ 739 status = gaudio_setup(&audio->card); 740 if (status < 0) 741 goto setup_fail; 742 743 audio->card.func.strings = audio_strings; 744 audio->card.func.bind = f_audio_bind; 745 audio->card.func.unbind = f_audio_unbind; 746 audio->card.func.set_alt = f_audio_set_alt; 747 audio->card.func.setup = f_audio_setup; 748 audio->card.func.disable = f_audio_disable; 749 750 control_selector_init(audio); 751 752 INIT_WORK(&audio->playback_work, f_audio_playback_work); 753 754 status = usb_add_function(c, &audio->card.func); 755 if (status) 756 goto add_fail; 757 758 INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n", 759 audio_buf_size, req_buf_size, req_count); 760 761 return status; 762 763 add_fail: 764 gaudio_cleanup(); 765 setup_fail: 766 kfree(audio); 767 return status; 768 } 769