1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * f_audio.c -- USB Audio class function driver 4 * 5 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> 6 * Copyright (C) 2008 Analog Devices, Inc 7 */ 8 9#include <linux/slab.h> 10#include <linux/kernel.h> 11#include <linux/module.h> 12#include <linux/device.h> 13#include <linux/atomic.h> 14 15#include "u_uac1_legacy.h" 16 17static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); 18static int generic_get_cmd(struct usb_audio_control *con, u8 cmd); 19 20/* 21 * DESCRIPTORS ... most are static, but strings and full 22 * configuration descriptors are built on demand. 23 */ 24 25/* 26 * We have two interfaces- AudioControl and AudioStreaming 27 * TODO: only supcard playback currently 28 */ 29#define F_AUDIO_AC_INTERFACE 0 30#define F_AUDIO_AS_INTERFACE 1 31#define F_AUDIO_NUM_INTERFACES 1 32 33/* B.3.1 Standard AC Interface Descriptor */ 34static struct usb_interface_descriptor ac_interface_desc = { 35 .bLength = USB_DT_INTERFACE_SIZE, 36 .bDescriptorType = USB_DT_INTERFACE, 37 .bNumEndpoints = 0, 38 .bInterfaceClass = USB_CLASS_AUDIO, 39 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 40}; 41 42/* 43 * The number of AudioStreaming and MIDIStreaming interfaces 44 * in the Audio Interface Collection 45 */ 46DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); 47 48#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) 49/* 1 input terminal, 1 output terminal and 1 feature unit */ 50#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \ 51 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0)) 52/* B.3.2 Class-Specific AC Interface Descriptor */ 53static struct uac1_ac_header_descriptor_1 ac_header_desc = { 54 .bLength = UAC_DT_AC_HEADER_LENGTH, 55 .bDescriptorType = USB_DT_CS_INTERFACE, 56 .bDescriptorSubtype = UAC_HEADER, 57 .bcdADC = cpu_to_le16(0x0100), 58 .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH), 59 .bInCollection = F_AUDIO_NUM_INTERFACES, 60 .baInterfaceNr = { 61 /* Interface number of the first AudioStream interface */ 62 [0] = 1, 63 } 64}; 65 66#define INPUT_TERMINAL_ID 1 67static struct uac_input_terminal_descriptor input_terminal_desc = { 68 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 69 .bDescriptorType = USB_DT_CS_INTERFACE, 70 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 71 .bTerminalID = INPUT_TERMINAL_ID, 72 .wTerminalType = UAC_TERMINAL_STREAMING, 73 .bAssocTerminal = 0, 74 .wChannelConfig = 0x3, 75}; 76 77DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); 78 79#define FEATURE_UNIT_ID 2 80static struct uac_feature_unit_descriptor_0 feature_unit_desc = { 81 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0), 82 .bDescriptorType = USB_DT_CS_INTERFACE, 83 .bDescriptorSubtype = UAC_FEATURE_UNIT, 84 .bUnitID = FEATURE_UNIT_ID, 85 .bSourceID = INPUT_TERMINAL_ID, 86 .bControlSize = 2, 87 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME), 88}; 89 90static struct usb_audio_control mute_control = { 91 .list = LIST_HEAD_INIT(mute_control.list), 92 .name = "Mute Control", 93 .type = UAC_FU_MUTE, 94 /* Todo: add real Mute control code */ 95 .set = generic_set_cmd, 96 .get = generic_get_cmd, 97}; 98 99static struct usb_audio_control volume_control = { 100 .list = LIST_HEAD_INIT(volume_control.list), 101 .name = "Volume Control", 102 .type = UAC_FU_VOLUME, 103 /* Todo: add real Volume control code */ 104 .set = generic_set_cmd, 105 .get = generic_get_cmd, 106}; 107 108static struct usb_audio_control_selector feature_unit = { 109 .list = LIST_HEAD_INIT(feature_unit.list), 110 .id = FEATURE_UNIT_ID, 111 .name = "Mute & Volume Control", 112 .type = UAC_FEATURE_UNIT, 113 .desc = (struct usb_descriptor_header *)&feature_unit_desc, 114}; 115 116#define OUTPUT_TERMINAL_ID 3 117static struct uac1_output_terminal_descriptor output_terminal_desc = { 118 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 119 .bDescriptorType = USB_DT_CS_INTERFACE, 120 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 121 .bTerminalID = OUTPUT_TERMINAL_ID, 122 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, 123 .bAssocTerminal = FEATURE_UNIT_ID, 124 .bSourceID = FEATURE_UNIT_ID, 125}; 126 127/* B.4.1 Standard AS Interface Descriptor */ 128static struct usb_interface_descriptor as_interface_alt_0_desc = { 129 .bLength = USB_DT_INTERFACE_SIZE, 130 .bDescriptorType = USB_DT_INTERFACE, 131 .bAlternateSetting = 0, 132 .bNumEndpoints = 0, 133 .bInterfaceClass = USB_CLASS_AUDIO, 134 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 135}; 136 137static struct usb_interface_descriptor as_interface_alt_1_desc = { 138 .bLength = USB_DT_INTERFACE_SIZE, 139 .bDescriptorType = USB_DT_INTERFACE, 140 .bAlternateSetting = 1, 141 .bNumEndpoints = 1, 142 .bInterfaceClass = USB_CLASS_AUDIO, 143 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 144}; 145 146/* B.4.2 Class-Specific AS Interface Descriptor */ 147static struct uac1_as_header_descriptor as_header_desc = { 148 .bLength = UAC_DT_AS_HEADER_SIZE, 149 .bDescriptorType = USB_DT_CS_INTERFACE, 150 .bDescriptorSubtype = UAC_AS_GENERAL, 151 .bTerminalLink = INPUT_TERMINAL_ID, 152 .bDelay = 1, 153 .wFormatTag = UAC_FORMAT_TYPE_I_PCM, 154}; 155 156DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); 157 158static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = { 159 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), 160 .bDescriptorType = USB_DT_CS_INTERFACE, 161 .bDescriptorSubtype = UAC_FORMAT_TYPE, 162 .bFormatType = UAC_FORMAT_TYPE_I, 163 .bSubframeSize = 2, 164 .bBitResolution = 16, 165 .bSamFreqType = 1, 166}; 167 168/* Standard ISO OUT Endpoint Descriptor */ 169static struct usb_endpoint_descriptor as_out_ep_desc = { 170 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 171 .bDescriptorType = USB_DT_ENDPOINT, 172 .bEndpointAddress = USB_DIR_OUT, 173 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE 174 | USB_ENDPOINT_XFER_ISOC, 175 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), 176 .bInterval = 4, 177}; 178 179/* Class-specific AS ISO OUT Endpoint Descriptor */ 180static struct uac_iso_endpoint_descriptor as_iso_out_desc = { 181 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 182 .bDescriptorType = USB_DT_CS_ENDPOINT, 183 .bDescriptorSubtype = UAC_EP_GENERAL, 184 .bmAttributes = 1, 185 .bLockDelayUnits = 1, 186 .wLockDelay = cpu_to_le16(1), 187}; 188 189static struct usb_descriptor_header *f_audio_desc[] = { 190 (struct usb_descriptor_header *)&ac_interface_desc, 191 (struct usb_descriptor_header *)&ac_header_desc, 192 193 (struct usb_descriptor_header *)&input_terminal_desc, 194 (struct usb_descriptor_header *)&output_terminal_desc, 195 (struct usb_descriptor_header *)&feature_unit_desc, 196 197 (struct usb_descriptor_header *)&as_interface_alt_0_desc, 198 (struct usb_descriptor_header *)&as_interface_alt_1_desc, 199 (struct usb_descriptor_header *)&as_header_desc, 200 201 (struct usb_descriptor_header *)&as_type_i_desc, 202 203 (struct usb_descriptor_header *)&as_out_ep_desc, 204 (struct usb_descriptor_header *)&as_iso_out_desc, 205 NULL, 206}; 207 208enum { 209 STR_AC_IF, 210 STR_INPUT_TERMINAL, 211 STR_INPUT_TERMINAL_CH_NAMES, 212 STR_FEAT_DESC_0, 213 STR_OUTPUT_TERMINAL, 214 STR_AS_IF_ALT0, 215 STR_AS_IF_ALT1, 216}; 217 218static struct usb_string strings_uac1[] = { 219 [STR_AC_IF].s = "AC Interface", 220 [STR_INPUT_TERMINAL].s = "Input terminal", 221 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels", 222 [STR_FEAT_DESC_0].s = "Volume control & mute", 223 [STR_OUTPUT_TERMINAL].s = "Output terminal", 224 [STR_AS_IF_ALT0].s = "AS Interface", 225 [STR_AS_IF_ALT1].s = "AS Interface", 226 { }, 227}; 228 229static struct usb_gadget_strings str_uac1 = { 230 .language = 0x0409, /* en-us */ 231 .strings = strings_uac1, 232}; 233 234static struct usb_gadget_strings *uac1_strings[] = { 235 &str_uac1, 236 NULL, 237}; 238 239/* 240 * This function is an ALSA sound card following USB Audio Class Spec 1.0. 241 */ 242 243/*-------------------------------------------------------------------------*/ 244struct f_audio_buf { 245 u8 *buf; 246 int actual; 247 struct list_head list; 248}; 249 250static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) 251{ 252 struct f_audio_buf *copy_buf; 253 254 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC); 255 if (!copy_buf) 256 return ERR_PTR(-ENOMEM); 257 258 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); 259 if (!copy_buf->buf) { 260 kfree(copy_buf); 261 return ERR_PTR(-ENOMEM); 262 } 263 264 return copy_buf; 265} 266 267static void f_audio_buffer_free(struct f_audio_buf *audio_buf) 268{ 269 kfree(audio_buf->buf); 270 kfree(audio_buf); 271} 272/*-------------------------------------------------------------------------*/ 273 274struct f_audio { 275 struct gaudio card; 276 277 u8 ac_intf, ac_alt; 278 u8 as_intf, as_alt; 279 280 /* endpoints handle full and/or high speeds */ 281 struct usb_ep *out_ep; 282 283 spinlock_t lock; 284 struct f_audio_buf *copy_buf; 285 struct work_struct playback_work; 286 struct list_head play_queue; 287 288 /* Control Set command */ 289 struct list_head cs; 290 u8 set_cmd; 291 struct usb_audio_control *set_con; 292}; 293 294static inline struct f_audio *func_to_audio(struct usb_function *f) 295{ 296 return container_of(f, struct f_audio, card.func); 297} 298 299/*-------------------------------------------------------------------------*/ 300 301static void f_audio_playback_work(struct work_struct *data) 302{ 303 struct f_audio *audio = container_of(data, struct f_audio, 304 playback_work); 305 struct f_audio_buf *play_buf; 306 307 spin_lock_irq(&audio->lock); 308 if (list_empty(&audio->play_queue)) { 309 spin_unlock_irq(&audio->lock); 310 return; 311 } 312 play_buf = list_first_entry(&audio->play_queue, 313 struct f_audio_buf, list); 314 list_del(&play_buf->list); 315 spin_unlock_irq(&audio->lock); 316 317 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual); 318 f_audio_buffer_free(play_buf); 319} 320 321static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req) 322{ 323 struct f_audio *audio = req->context; 324 struct usb_composite_dev *cdev = audio->card.func.config->cdev; 325 struct f_audio_buf *copy_buf = audio->copy_buf; 326 struct f_uac1_legacy_opts *opts; 327 int audio_buf_size; 328 int err; 329 330 opts = container_of(audio->card.func.fi, struct f_uac1_legacy_opts, 331 func_inst); 332 audio_buf_size = opts->audio_buf_size; 333 334 if (!copy_buf) 335 return -EINVAL; 336 337 /* Copy buffer is full, add it to the play_queue */ 338 if (audio_buf_size - copy_buf->actual < req->actual) { 339 spin_lock_irq(&audio->lock); 340 list_add_tail(©_buf->list, &audio->play_queue); 341 spin_unlock_irq(&audio->lock); 342 schedule_work(&audio->playback_work); 343 copy_buf = f_audio_buffer_alloc(audio_buf_size); 344 if (IS_ERR(copy_buf)) 345 return -ENOMEM; 346 } 347 348 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); 349 copy_buf->actual += req->actual; 350 audio->copy_buf = copy_buf; 351 352 err = usb_ep_queue(ep, req, GFP_ATOMIC); 353 if (err) 354 ERROR(cdev, "%s queue req: %d\n", ep->name, err); 355 356 return 0; 357 358} 359 360static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) 361{ 362 struct f_audio *audio = req->context; 363 int status = req->status; 364 u32 data = 0; 365 struct usb_ep *out_ep = audio->out_ep; 366 367 switch (status) { 368 369 case 0: /* normal completion? */ 370 if (ep == out_ep) 371 f_audio_out_ep_complete(ep, req); 372 else if (audio->set_con) { 373 memcpy(&data, req->buf, req->length); 374 audio->set_con->set(audio->set_con, audio->set_cmd, 375 le16_to_cpu(data)); 376 audio->set_con = NULL; 377 } 378 break; 379 default: 380 break; 381 } 382} 383 384static int audio_set_intf_req(struct usb_function *f, 385 const struct usb_ctrlrequest *ctrl) 386{ 387 struct f_audio *audio = func_to_audio(f); 388 struct usb_composite_dev *cdev = f->config->cdev; 389 struct usb_request *req = cdev->req; 390 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 391 u16 len = le16_to_cpu(ctrl->wLength); 392 u16 w_value = le16_to_cpu(ctrl->wValue); 393 u8 con_sel = (w_value >> 8) & 0xFF; 394 u8 cmd = (ctrl->bRequest & 0x0F); 395 struct usb_audio_control_selector *cs; 396 struct usb_audio_control *con; 397 398 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 399 ctrl->bRequest, w_value, len, id); 400 401 list_for_each_entry(cs, &audio->cs, list) { 402 if (cs->id == id) { 403 list_for_each_entry(con, &cs->control, list) { 404 if (con->type == con_sel) { 405 audio->set_con = con; 406 break; 407 } 408 } 409 break; 410 } 411 } 412 413 audio->set_cmd = cmd; 414 req->context = audio; 415 req->complete = f_audio_complete; 416 417 return len; 418} 419 420static int audio_get_intf_req(struct usb_function *f, 421 const struct usb_ctrlrequest *ctrl) 422{ 423 struct f_audio *audio = func_to_audio(f); 424 struct usb_composite_dev *cdev = f->config->cdev; 425 struct usb_request *req = cdev->req; 426 int value = -EOPNOTSUPP; 427 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 428 u16 len = le16_to_cpu(ctrl->wLength); 429 u16 w_value = le16_to_cpu(ctrl->wValue); 430 u8 con_sel = (w_value >> 8) & 0xFF; 431 u8 cmd = (ctrl->bRequest & 0x0F); 432 struct usb_audio_control_selector *cs; 433 struct usb_audio_control *con; 434 435 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 436 ctrl->bRequest, w_value, len, id); 437 438 list_for_each_entry(cs, &audio->cs, list) { 439 if (cs->id == id) { 440 list_for_each_entry(con, &cs->control, list) { 441 if (con->type == con_sel && con->get) { 442 value = con->get(con, cmd); 443 break; 444 } 445 } 446 break; 447 } 448 } 449 450 req->context = audio; 451 req->complete = f_audio_complete; 452 len = min_t(size_t, sizeof(value), len); 453 memcpy(req->buf, &value, len); 454 455 return len; 456} 457 458static int audio_set_endpoint_req(struct usb_function *f, 459 const struct usb_ctrlrequest *ctrl) 460{ 461 struct usb_composite_dev *cdev = f->config->cdev; 462 int value = -EOPNOTSUPP; 463 u16 ep = le16_to_cpu(ctrl->wIndex); 464 u16 len = le16_to_cpu(ctrl->wLength); 465 u16 w_value = le16_to_cpu(ctrl->wValue); 466 467 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 468 ctrl->bRequest, w_value, len, ep); 469 470 switch (ctrl->bRequest) { 471 case UAC_SET_CUR: 472 value = len; 473 break; 474 475 case UAC_SET_MIN: 476 break; 477 478 case UAC_SET_MAX: 479 break; 480 481 case UAC_SET_RES: 482 break; 483 484 case UAC_SET_MEM: 485 break; 486 487 default: 488 break; 489 } 490 491 return value; 492} 493 494static int audio_get_endpoint_req(struct usb_function *f, 495 const struct usb_ctrlrequest *ctrl) 496{ 497 struct usb_composite_dev *cdev = f->config->cdev; 498 int value = -EOPNOTSUPP; 499 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 500 u16 len = le16_to_cpu(ctrl->wLength); 501 u16 w_value = le16_to_cpu(ctrl->wValue); 502 503 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 504 ctrl->bRequest, w_value, len, ep); 505 506 switch (ctrl->bRequest) { 507 case UAC_GET_CUR: 508 case UAC_GET_MIN: 509 case UAC_GET_MAX: 510 case UAC_GET_RES: 511 value = len; 512 break; 513 case UAC_GET_MEM: 514 break; 515 default: 516 break; 517 } 518 519 return value; 520} 521 522static int 523f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 524{ 525 struct usb_composite_dev *cdev = f->config->cdev; 526 struct usb_request *req = cdev->req; 527 int value = -EOPNOTSUPP; 528 u16 w_index = le16_to_cpu(ctrl->wIndex); 529 u16 w_value = le16_to_cpu(ctrl->wValue); 530 u16 w_length = le16_to_cpu(ctrl->wLength); 531 532 /* composite driver infrastructure handles everything; interface 533 * activation uses set_alt(). 534 */ 535 switch (ctrl->bRequestType) { 536 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 537 value = audio_set_intf_req(f, ctrl); 538 break; 539 540 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 541 value = audio_get_intf_req(f, ctrl); 542 break; 543 544 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 545 value = audio_set_endpoint_req(f, ctrl); 546 break; 547 548 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 549 value = audio_get_endpoint_req(f, ctrl); 550 break; 551 552 default: 553 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", 554 ctrl->bRequestType, ctrl->bRequest, 555 w_value, w_index, w_length); 556 } 557 558 /* respond with data transfer or status phase? */ 559 if (value >= 0) { 560 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", 561 ctrl->bRequestType, ctrl->bRequest, 562 w_value, w_index, w_length); 563 req->zero = 0; 564 req->length = value; 565 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 566 if (value < 0) 567 ERROR(cdev, "audio response on err %d\n", value); 568 } 569 570 /* device either stalls (value < 0) or reports success */ 571 return value; 572} 573 574static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 575{ 576 struct f_audio *audio = func_to_audio(f); 577 struct usb_composite_dev *cdev = f->config->cdev; 578 struct usb_ep *out_ep = audio->out_ep; 579 struct usb_request *req; 580 struct f_uac1_legacy_opts *opts; 581 int req_buf_size, req_count, audio_buf_size; 582 int i = 0, err = 0; 583 584 DBG(cdev, "intf %d, alt %d\n", intf, alt); 585 586 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 587 req_buf_size = opts->req_buf_size; 588 req_count = opts->req_count; 589 audio_buf_size = opts->audio_buf_size; 590 591 /* No i/f has more than 2 alt settings */ 592 if (alt > 1) { 593 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); 594 return -EINVAL; 595 } 596 597 if (intf == audio->ac_intf) { 598 /* Control I/f has only 1 AltSetting - 0 */ 599 if (alt) { 600 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); 601 return -EINVAL; 602 } 603 return 0; 604 } else if (intf == audio->as_intf) { 605 if (alt == 1) { 606 err = config_ep_by_speed(cdev->gadget, f, out_ep); 607 if (err) 608 return err; 609 610 usb_ep_enable(out_ep); 611 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); 612 if (IS_ERR(audio->copy_buf)) 613 return -ENOMEM; 614 615 /* 616 * allocate a bunch of read buffers 617 * and queue them all at once. 618 */ 619 for (i = 0; i < req_count && err == 0; i++) { 620 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); 621 if (req) { 622 req->buf = kzalloc(req_buf_size, 623 GFP_ATOMIC); 624 if (req->buf) { 625 req->length = req_buf_size; 626 req->context = audio; 627 req->complete = 628 f_audio_complete; 629 err = usb_ep_queue(out_ep, 630 req, GFP_ATOMIC); 631 if (err) 632 ERROR(cdev, 633 "%s queue req: %d\n", 634 out_ep->name, err); 635 } else 636 err = -ENOMEM; 637 } else 638 err = -ENOMEM; 639 } 640 641 } else { 642 struct f_audio_buf *copy_buf = audio->copy_buf; 643 if (copy_buf) { 644 list_add_tail(©_buf->list, 645 &audio->play_queue); 646 schedule_work(&audio->playback_work); 647 } 648 } 649 audio->as_alt = alt; 650 } 651 652 return err; 653} 654 655static int f_audio_get_alt(struct usb_function *f, unsigned intf) 656{ 657 struct f_audio *audio = func_to_audio(f); 658 struct usb_composite_dev *cdev = f->config->cdev; 659 660 if (intf == audio->ac_intf) 661 return audio->ac_alt; 662 else if (intf == audio->as_intf) 663 return audio->as_alt; 664 else 665 ERROR(cdev, "%s:%d Invalid Interface %d!\n", 666 __func__, __LINE__, intf); 667 668 return -EINVAL; 669} 670 671static void f_audio_disable(struct usb_function *f) 672{ 673 return; 674} 675 676/*-------------------------------------------------------------------------*/ 677 678static void f_audio_build_desc(struct f_audio *audio) 679{ 680 struct gaudio *card = &audio->card; 681 u8 *sam_freq; 682 int rate; 683 684 /* Set channel numbers */ 685 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); 686 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); 687 688 /* Set sample rates */ 689 rate = u_audio_get_playback_rate(card); 690 sam_freq = as_type_i_desc.tSamFreq[0]; 691 memcpy(sam_freq, &rate, 3); 692 693 /* Todo: Set Sample bits and other parameters */ 694 695 return; 696} 697 698/* audio function driver setup/binding */ 699static int 700f_audio_bind(struct usb_configuration *c, struct usb_function *f) 701{ 702 struct usb_composite_dev *cdev = c->cdev; 703 struct f_audio *audio = func_to_audio(f); 704 struct usb_string *us; 705 int status; 706 struct usb_ep *ep = NULL; 707 struct f_uac1_legacy_opts *audio_opts; 708 709 audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 710 audio->card.gadget = c->cdev->gadget; 711 /* set up ASLA audio devices */ 712 if (!audio_opts->bound) { 713 status = gaudio_setup(&audio->card); 714 if (status < 0) 715 return status; 716 audio_opts->bound = true; 717 } 718 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); 719 if (IS_ERR(us)) 720 return PTR_ERR(us); 721 ac_interface_desc.iInterface = us[STR_AC_IF].id; 722 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id; 723 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id; 724 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id; 725 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id; 726 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id; 727 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id; 728 729 730 f_audio_build_desc(audio); 731 732 /* allocate instance-specific interface IDs, and patch descriptors */ 733 status = usb_interface_id(c, f); 734 if (status < 0) 735 goto fail; 736 ac_interface_desc.bInterfaceNumber = status; 737 audio->ac_intf = status; 738 audio->ac_alt = 0; 739 740 status = usb_interface_id(c, f); 741 if (status < 0) 742 goto fail; 743 as_interface_alt_0_desc.bInterfaceNumber = status; 744 as_interface_alt_1_desc.bInterfaceNumber = status; 745 audio->as_intf = status; 746 audio->as_alt = 0; 747 748 status = -ENODEV; 749 750 /* allocate instance-specific endpoints */ 751 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 752 if (!ep) 753 goto fail; 754 audio->out_ep = ep; 755 audio->out_ep->desc = &as_out_ep_desc; 756 757 /* copy descriptors, and track endpoint copies */ 758 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, 759 NULL); 760 if (status) 761 goto fail; 762 return 0; 763 764fail: 765 gaudio_cleanup(&audio->card); 766 return status; 767} 768 769/*-------------------------------------------------------------------------*/ 770 771static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) 772{ 773 con->data[cmd] = value; 774 775 return 0; 776} 777 778static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) 779{ 780 return con->data[cmd]; 781} 782 783/* Todo: add more control selecotor dynamically */ 784static int control_selector_init(struct f_audio *audio) 785{ 786 INIT_LIST_HEAD(&audio->cs); 787 list_add(&feature_unit.list, &audio->cs); 788 789 INIT_LIST_HEAD(&feature_unit.control); 790 list_add(&mute_control.list, &feature_unit.control); 791 list_add(&volume_control.list, &feature_unit.control); 792 793 volume_control.data[UAC__CUR] = 0xffc0; 794 volume_control.data[UAC__MIN] = 0xe3a0; 795 volume_control.data[UAC__MAX] = 0xfff0; 796 volume_control.data[UAC__RES] = 0x0030; 797 798 return 0; 799} 800 801static inline 802struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item) 803{ 804 return container_of(to_config_group(item), struct f_uac1_legacy_opts, 805 func_inst.group); 806} 807 808static void f_uac1_attr_release(struct config_item *item) 809{ 810 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); 811 812 usb_put_function_instance(&opts->func_inst); 813} 814 815static struct configfs_item_operations f_uac1_item_ops = { 816 .release = f_uac1_attr_release, 817}; 818 819#define UAC1_INT_ATTRIBUTE(name) \ 820static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 821 char *page) \ 822{ \ 823 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 824 int result; \ 825 \ 826 mutex_lock(&opts->lock); \ 827 result = sprintf(page, "%u\n", opts->name); \ 828 mutex_unlock(&opts->lock); \ 829 \ 830 return result; \ 831} \ 832 \ 833static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 834 const char *page, size_t len) \ 835{ \ 836 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 837 int ret; \ 838 u32 num; \ 839 \ 840 mutex_lock(&opts->lock); \ 841 if (opts->refcnt) { \ 842 ret = -EBUSY; \ 843 goto end; \ 844 } \ 845 \ 846 ret = kstrtou32(page, 0, &num); \ 847 if (ret) \ 848 goto end; \ 849 \ 850 opts->name = num; \ 851 ret = len; \ 852 \ 853end: \ 854 mutex_unlock(&opts->lock); \ 855 return ret; \ 856} \ 857 \ 858CONFIGFS_ATTR(f_uac1_opts_, name) 859 860UAC1_INT_ATTRIBUTE(req_buf_size); 861UAC1_INT_ATTRIBUTE(req_count); 862UAC1_INT_ATTRIBUTE(audio_buf_size); 863 864#define UAC1_STR_ATTRIBUTE(name) \ 865static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 866 char *page) \ 867{ \ 868 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 869 int result; \ 870 \ 871 mutex_lock(&opts->lock); \ 872 result = sprintf(page, "%s\n", opts->name); \ 873 mutex_unlock(&opts->lock); \ 874 \ 875 return result; \ 876} \ 877 \ 878static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 879 const char *page, size_t len) \ 880{ \ 881 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 882 int ret = -EBUSY; \ 883 char *tmp; \ 884 \ 885 mutex_lock(&opts->lock); \ 886 if (opts->refcnt) \ 887 goto end; \ 888 \ 889 tmp = kstrndup(page, len, GFP_KERNEL); \ 890 if (tmp) { \ 891 ret = -ENOMEM; \ 892 goto end; \ 893 } \ 894 if (opts->name##_alloc) \ 895 kfree(opts->name); \ 896 opts->name##_alloc = true; \ 897 opts->name = tmp; \ 898 ret = len; \ 899 \ 900end: \ 901 mutex_unlock(&opts->lock); \ 902 return ret; \ 903} \ 904 \ 905CONFIGFS_ATTR(f_uac1_opts_, name) 906 907UAC1_STR_ATTRIBUTE(fn_play); 908UAC1_STR_ATTRIBUTE(fn_cap); 909UAC1_STR_ATTRIBUTE(fn_cntl); 910 911static struct configfs_attribute *f_uac1_attrs[] = { 912 &f_uac1_opts_attr_req_buf_size, 913 &f_uac1_opts_attr_req_count, 914 &f_uac1_opts_attr_audio_buf_size, 915 &f_uac1_opts_attr_fn_play, 916 &f_uac1_opts_attr_fn_cap, 917 &f_uac1_opts_attr_fn_cntl, 918 NULL, 919}; 920 921static const struct config_item_type f_uac1_func_type = { 922 .ct_item_ops = &f_uac1_item_ops, 923 .ct_attrs = f_uac1_attrs, 924 .ct_owner = THIS_MODULE, 925}; 926 927static void f_audio_free_inst(struct usb_function_instance *f) 928{ 929 struct f_uac1_legacy_opts *opts; 930 931 opts = container_of(f, struct f_uac1_legacy_opts, func_inst); 932 if (opts->fn_play_alloc) 933 kfree(opts->fn_play); 934 if (opts->fn_cap_alloc) 935 kfree(opts->fn_cap); 936 if (opts->fn_cntl_alloc) 937 kfree(opts->fn_cntl); 938 kfree(opts); 939} 940 941static struct usb_function_instance *f_audio_alloc_inst(void) 942{ 943 struct f_uac1_legacy_opts *opts; 944 945 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 946 if (!opts) 947 return ERR_PTR(-ENOMEM); 948 949 mutex_init(&opts->lock); 950 opts->func_inst.free_func_inst = f_audio_free_inst; 951 952 config_group_init_type_name(&opts->func_inst.group, "", 953 &f_uac1_func_type); 954 955 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; 956 opts->req_count = UAC1_REQ_COUNT; 957 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE; 958 opts->fn_play = FILE_PCM_PLAYBACK; 959 opts->fn_cap = FILE_PCM_CAPTURE; 960 opts->fn_cntl = FILE_CONTROL; 961 return &opts->func_inst; 962} 963 964static void f_audio_free(struct usb_function *f) 965{ 966 struct f_audio *audio = func_to_audio(f); 967 struct f_uac1_legacy_opts *opts; 968 969 gaudio_cleanup(&audio->card); 970 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 971 kfree(audio); 972 mutex_lock(&opts->lock); 973 --opts->refcnt; 974 mutex_unlock(&opts->lock); 975} 976 977static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 978{ 979 usb_free_all_descriptors(f); 980} 981 982static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) 983{ 984 struct f_audio *audio; 985 struct f_uac1_legacy_opts *opts; 986 987 /* allocate and initialize one new instance */ 988 audio = kzalloc(sizeof(*audio), GFP_KERNEL); 989 if (!audio) 990 return ERR_PTR(-ENOMEM); 991 992 audio->card.func.name = "g_audio"; 993 994 opts = container_of(fi, struct f_uac1_legacy_opts, func_inst); 995 mutex_lock(&opts->lock); 996 ++opts->refcnt; 997 mutex_unlock(&opts->lock); 998 INIT_LIST_HEAD(&audio->play_queue); 999 spin_lock_init(&audio->lock); 1000 1001 audio->card.func.bind = f_audio_bind; 1002 audio->card.func.unbind = f_audio_unbind; 1003 audio->card.func.set_alt = f_audio_set_alt; 1004 audio->card.func.get_alt = f_audio_get_alt; 1005 audio->card.func.setup = f_audio_setup; 1006 audio->card.func.disable = f_audio_disable; 1007 audio->card.func.free_func = f_audio_free; 1008 1009 control_selector_init(audio); 1010 1011 INIT_WORK(&audio->playback_work, f_audio_playback_work); 1012 1013 return &audio->card.func; 1014} 1015 1016DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc); 1017MODULE_LICENSE("GPL"); 1018MODULE_AUTHOR("Bryan Wu"); 1019