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 <asm/atomic.h> 16 17#include "u_audio.h" 18 19#define OUT_EP_MAX_PACKET_SIZE 200 20static int req_buf_size = OUT_EP_MAX_PACKET_SIZE; 21module_param(req_buf_size, int, S_IRUGO); 22MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size"); 23 24static int req_count = 256; 25module_param(req_count, int, S_IRUGO); 26MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count"); 27 28static int audio_buf_size = 48000; 29module_param(audio_buf_size, int, S_IRUGO); 30MODULE_PARM_DESC(audio_buf_size, "Audio buffer size"); 31 32static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); 33static 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 */ 49static 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 57DECLARE_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 */ 64static 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 78static 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 88DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); 89 90#define FEATURE_UNIT_ID 2 91static 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 101static 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 110static 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 119static 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 128static 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 */ 139static 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 148static 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 */ 158static 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 167DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); 168 169static 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 */ 180static struct usb_endpoint_descriptor as_out_ep_desc __initdata = { 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 */ 191static 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 200static 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/* string IDs are assigned dynamically */ 220 221#define STRING_MANUFACTURER_IDX 0 222#define STRING_PRODUCT_IDX 1 223 224static char manufacturer[50]; 225 226static struct usb_string strings_dev[] = { 227 [STRING_MANUFACTURER_IDX].s = manufacturer, 228 [STRING_PRODUCT_IDX].s = DRIVER_DESC, 229 { } /* end of list */ 230}; 231 232static struct usb_gadget_strings stringtab_dev = { 233 .language = 0x0409, /* en-us */ 234 .strings = strings_dev, 235}; 236 237static struct usb_gadget_strings *audio_strings[] = { 238 &stringtab_dev, 239 NULL, 240}; 241 242/* 243 * This function is an ALSA sound card following USB Audio Class Spec 1.0. 244 */ 245 246/*-------------------------------------------------------------------------*/ 247struct f_audio_buf { 248 u8 *buf; 249 int actual; 250 struct list_head list; 251}; 252 253static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) 254{ 255 struct f_audio_buf *copy_buf; 256 257 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC); 258 if (!copy_buf) 259 return ERR_PTR(-ENOMEM); 260 261 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); 262 if (!copy_buf->buf) { 263 kfree(copy_buf); 264 return ERR_PTR(-ENOMEM); 265 } 266 267 return copy_buf; 268} 269 270static void f_audio_buffer_free(struct f_audio_buf *audio_buf) 271{ 272 kfree(audio_buf->buf); 273 kfree(audio_buf); 274} 275/*-------------------------------------------------------------------------*/ 276 277struct f_audio { 278 struct gaudio card; 279 280 /* endpoints handle full and/or high speeds */ 281 struct usb_ep *out_ep; 282 struct usb_endpoint_descriptor *out_desc; 283 284 spinlock_t lock; 285 struct f_audio_buf *copy_buf; 286 struct work_struct playback_work; 287 struct list_head play_queue; 288 289 /* Control Set command */ 290 struct list_head cs; 291 u8 set_cmd; 292 struct usb_audio_control *set_con; 293}; 294 295static inline struct f_audio *func_to_audio(struct usb_function *f) 296{ 297 return container_of(f, struct f_audio, card.func); 298} 299 300/*-------------------------------------------------------------------------*/ 301 302static void f_audio_playback_work(struct work_struct *data) 303{ 304 struct f_audio *audio = container_of(data, struct f_audio, 305 playback_work); 306 struct f_audio_buf *play_buf; 307 308 spin_lock_irq(&audio->lock); 309 if (list_empty(&audio->play_queue)) { 310 spin_unlock_irq(&audio->lock); 311 return; 312 } 313 play_buf = list_first_entry(&audio->play_queue, 314 struct f_audio_buf, list); 315 list_del(&play_buf->list); 316 spin_unlock_irq(&audio->lock); 317 318 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual); 319 f_audio_buffer_free(play_buf); 320 321 return; 322} 323 324static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req) 325{ 326 struct f_audio *audio = req->context; 327 struct usb_composite_dev *cdev = audio->card.func.config->cdev; 328 struct f_audio_buf *copy_buf = audio->copy_buf; 329 int err; 330 331 if (!copy_buf) 332 return -EINVAL; 333 334 /* Copy buffer is full, add it to the play_queue */ 335 if (audio_buf_size - copy_buf->actual < req->actual) { 336 list_add_tail(©_buf->list, &audio->play_queue); 337 schedule_work(&audio->playback_work); 338 copy_buf = f_audio_buffer_alloc(audio_buf_size); 339 if (IS_ERR(copy_buf)) 340 return -ENOMEM; 341 } 342 343 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); 344 copy_buf->actual += req->actual; 345 audio->copy_buf = copy_buf; 346 347 err = usb_ep_queue(ep, req, GFP_ATOMIC); 348 if (err) 349 ERROR(cdev, "%s queue req: %d\n", ep->name, err); 350 351 return 0; 352 353} 354 355static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) 356{ 357 struct f_audio *audio = req->context; 358 int status = req->status; 359 u32 data = 0; 360 struct usb_ep *out_ep = audio->out_ep; 361 362 switch (status) { 363 364 case 0: /* normal completion? */ 365 if (ep == out_ep) 366 f_audio_out_ep_complete(ep, req); 367 else if (audio->set_con) { 368 memcpy(&data, req->buf, req->length); 369 audio->set_con->set(audio->set_con, audio->set_cmd, 370 le16_to_cpu(data)); 371 audio->set_con = NULL; 372 } 373 break; 374 default: 375 break; 376 } 377} 378 379static int audio_set_intf_req(struct usb_function *f, 380 const struct usb_ctrlrequest *ctrl) 381{ 382 struct f_audio *audio = func_to_audio(f); 383 struct usb_composite_dev *cdev = f->config->cdev; 384 struct usb_request *req = cdev->req; 385 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 386 u16 len = le16_to_cpu(ctrl->wLength); 387 u16 w_value = le16_to_cpu(ctrl->wValue); 388 u8 con_sel = (w_value >> 8) & 0xFF; 389 u8 cmd = (ctrl->bRequest & 0x0F); 390 struct usb_audio_control_selector *cs; 391 struct usb_audio_control *con; 392 393 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 394 ctrl->bRequest, w_value, len, id); 395 396 list_for_each_entry(cs, &audio->cs, list) { 397 if (cs->id == id) { 398 list_for_each_entry(con, &cs->control, list) { 399 if (con->type == con_sel) { 400 audio->set_con = con; 401 break; 402 } 403 } 404 break; 405 } 406 } 407 408 audio->set_cmd = cmd; 409 req->context = audio; 410 req->complete = f_audio_complete; 411 412 return len; 413} 414 415static int audio_get_intf_req(struct usb_function *f, 416 const struct usb_ctrlrequest *ctrl) 417{ 418 struct f_audio *audio = func_to_audio(f); 419 struct usb_composite_dev *cdev = f->config->cdev; 420 struct usb_request *req = cdev->req; 421 int value = -EOPNOTSUPP; 422 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 423 u16 len = le16_to_cpu(ctrl->wLength); 424 u16 w_value = le16_to_cpu(ctrl->wValue); 425 u8 con_sel = (w_value >> 8) & 0xFF; 426 u8 cmd = (ctrl->bRequest & 0x0F); 427 struct usb_audio_control_selector *cs; 428 struct usb_audio_control *con; 429 430 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 431 ctrl->bRequest, w_value, len, id); 432 433 list_for_each_entry(cs, &audio->cs, list) { 434 if (cs->id == id) { 435 list_for_each_entry(con, &cs->control, list) { 436 if (con->type == con_sel && con->get) { 437 value = con->get(con, cmd); 438 break; 439 } 440 } 441 break; 442 } 443 } 444 445 req->context = audio; 446 req->complete = f_audio_complete; 447 memcpy(req->buf, &value, len); 448 449 return len; 450} 451 452static 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 = 0; 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 488static 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 = 3; 506 break; 507 case UAC_GET_MEM: 508 break; 509 default: 510 break; 511 } 512 513 return value; 514} 515 516static int 517f_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 568static 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 int i = 0, err = 0; 575 576 DBG(cdev, "intf %d, alt %d\n", intf, alt); 577 578 if (intf == 1) { 579 if (alt == 1) { 580 usb_ep_enable(out_ep, audio->out_desc); 581 out_ep->driver_data = audio; 582 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); 583 if (IS_ERR(audio->copy_buf)) 584 return -ENOMEM; 585 586 /* 587 * allocate a bunch of read buffers 588 * and queue them all at once. 589 */ 590 for (i = 0; i < req_count && err == 0; i++) { 591 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); 592 if (req) { 593 req->buf = kzalloc(req_buf_size, 594 GFP_ATOMIC); 595 if (req->buf) { 596 req->length = req_buf_size; 597 req->context = audio; 598 req->complete = 599 f_audio_complete; 600 err = usb_ep_queue(out_ep, 601 req, GFP_ATOMIC); 602 if (err) 603 ERROR(cdev, 604 "%s queue req: %d\n", 605 out_ep->name, err); 606 } else 607 err = -ENOMEM; 608 } else 609 err = -ENOMEM; 610 } 611 612 } else { 613 struct f_audio_buf *copy_buf = audio->copy_buf; 614 if (copy_buf) { 615 list_add_tail(©_buf->list, 616 &audio->play_queue); 617 schedule_work(&audio->playback_work); 618 } 619 } 620 } 621 622 return err; 623} 624 625static void f_audio_disable(struct usb_function *f) 626{ 627 return; 628} 629 630/*-------------------------------------------------------------------------*/ 631 632static void f_audio_build_desc(struct f_audio *audio) 633{ 634 struct gaudio *card = &audio->card; 635 u8 *sam_freq; 636 int rate; 637 638 /* Set channel numbers */ 639 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); 640 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); 641 642 /* Set sample rates */ 643 rate = u_audio_get_playback_rate(card); 644 sam_freq = as_type_i_desc.tSamFreq[0]; 645 memcpy(sam_freq, &rate, 3); 646 647 /* Todo: Set Sample bits and other parameters */ 648 649 return; 650} 651 652/* audio function driver setup/binding */ 653static int __init 654f_audio_bind(struct usb_configuration *c, struct usb_function *f) 655{ 656 struct usb_composite_dev *cdev = c->cdev; 657 struct f_audio *audio = func_to_audio(f); 658 int status; 659 struct usb_ep *ep; 660 661 f_audio_build_desc(audio); 662 663 /* allocate instance-specific interface IDs, and patch descriptors */ 664 status = usb_interface_id(c, f); 665 if (status < 0) 666 goto fail; 667 ac_interface_desc.bInterfaceNumber = status; 668 669 status = usb_interface_id(c, f); 670 if (status < 0) 671 goto fail; 672 as_interface_alt_0_desc.bInterfaceNumber = status; 673 as_interface_alt_1_desc.bInterfaceNumber = status; 674 675 status = -ENODEV; 676 677 /* allocate instance-specific endpoints */ 678 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 679 if (!ep) 680 goto fail; 681 audio->out_ep = ep; 682 ep->driver_data = cdev; /* claim */ 683 684 status = -ENOMEM; 685 686 /* supcard all relevant hardware speeds... we expect that when 687 * hardware is dual speed, all bulk-capable endpoints work at 688 * both speeds 689 */ 690 691 /* copy descriptors, and track endpoint copies */ 692 if (gadget_is_dualspeed(c->cdev->gadget)) { 693 c->highspeed = true; 694 f->hs_descriptors = usb_copy_descriptors(f_audio_desc); 695 } else 696 f->descriptors = usb_copy_descriptors(f_audio_desc); 697 698 return 0; 699 700fail: 701 702 return status; 703} 704 705static void 706f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 707{ 708 struct f_audio *audio = func_to_audio(f); 709 710 usb_free_descriptors(f->descriptors); 711 kfree(audio); 712} 713 714/*-------------------------------------------------------------------------*/ 715 716static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) 717{ 718 con->data[cmd] = value; 719 720 return 0; 721} 722 723static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) 724{ 725 return con->data[cmd]; 726} 727 728/* Todo: add more control selecotor dynamically */ 729int __init control_selector_init(struct f_audio *audio) 730{ 731 INIT_LIST_HEAD(&audio->cs); 732 list_add(&feature_unit.list, &audio->cs); 733 734 INIT_LIST_HEAD(&feature_unit.control); 735 list_add(&mute_control.list, &feature_unit.control); 736 list_add(&volume_control.list, &feature_unit.control); 737 738 volume_control.data[UAC__CUR] = 0xffc0; 739 volume_control.data[UAC__MIN] = 0xe3a0; 740 volume_control.data[UAC__MAX] = 0xfff0; 741 volume_control.data[UAC__RES] = 0x0030; 742 743 return 0; 744} 745 746/** 747 * audio_bind_config - add USB audio fucntion to a configuration 748 * @c: the configuration to supcard the USB audio function 749 * Context: single threaded during gadget setup 750 * 751 * Returns zero on success, else negative errno. 752 */ 753int __init audio_bind_config(struct usb_configuration *c) 754{ 755 struct f_audio *audio; 756 int status; 757 758 /* allocate and initialize one new instance */ 759 audio = kzalloc(sizeof *audio, GFP_KERNEL); 760 if (!audio) 761 return -ENOMEM; 762 763 audio->card.func.name = "g_audio"; 764 audio->card.gadget = c->cdev->gadget; 765 766 INIT_LIST_HEAD(&audio->play_queue); 767 spin_lock_init(&audio->lock); 768 769 /* set up ASLA audio devices */ 770 status = gaudio_setup(&audio->card); 771 if (status < 0) 772 goto setup_fail; 773 774 audio->card.func.strings = audio_strings; 775 audio->card.func.bind = f_audio_bind; 776 audio->card.func.unbind = f_audio_unbind; 777 audio->card.func.set_alt = f_audio_set_alt; 778 audio->card.func.setup = f_audio_setup; 779 audio->card.func.disable = f_audio_disable; 780 audio->out_desc = &as_out_ep_desc; 781 782 control_selector_init(audio); 783 784 INIT_WORK(&audio->playback_work, f_audio_playback_work); 785 786 status = usb_add_function(c, &audio->card.func); 787 if (status) 788 goto add_fail; 789 790 INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n", 791 audio_buf_size, req_buf_size, req_count); 792 793 return status; 794 795add_fail: 796 gaudio_cleanup(); 797setup_fail: 798 kfree(audio); 799 return status; 800} 801