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 * Enter bugs at http://blackfin.uclinux.org/ 9 */ 10 11 #include <linux/slab.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/device.h> 15 #include <linux/atomic.h> 16 17 #include "u_uac1_legacy.h" 18 19 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); 20 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd); 21 22 /* 23 * DESCRIPTORS ... most are static, but strings and full 24 * configuration descriptors are built on demand. 25 */ 26 27 /* 28 * We have two interfaces- AudioControl and AudioStreaming 29 * TODO: only supcard playback currently 30 */ 31 #define F_AUDIO_AC_INTERFACE 0 32 #define F_AUDIO_AS_INTERFACE 1 33 #define F_AUDIO_NUM_INTERFACES 1 34 35 /* B.3.1 Standard AC Interface Descriptor */ 36 static struct usb_interface_descriptor ac_interface_desc = { 37 .bLength = USB_DT_INTERFACE_SIZE, 38 .bDescriptorType = USB_DT_INTERFACE, 39 .bNumEndpoints = 0, 40 .bInterfaceClass = USB_CLASS_AUDIO, 41 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 42 }; 43 44 /* 45 * The number of AudioStreaming and MIDIStreaming interfaces 46 * in the Audio Interface Collection 47 */ 48 DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); 49 50 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) 51 /* 1 input terminal, 1 output terminal and 1 feature unit */ 52 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \ 53 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0)) 54 /* B.3.2 Class-Specific AC Interface Descriptor */ 55 static struct uac1_ac_header_descriptor_1 ac_header_desc = { 56 .bLength = UAC_DT_AC_HEADER_LENGTH, 57 .bDescriptorType = USB_DT_CS_INTERFACE, 58 .bDescriptorSubtype = UAC_HEADER, 59 .bcdADC = __constant_cpu_to_le16(0x0100), 60 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH), 61 .bInCollection = F_AUDIO_NUM_INTERFACES, 62 .baInterfaceNr = { 63 /* Interface number of the first AudioStream interface */ 64 [0] = 1, 65 } 66 }; 67 68 #define INPUT_TERMINAL_ID 1 69 static struct uac_input_terminal_descriptor input_terminal_desc = { 70 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 71 .bDescriptorType = USB_DT_CS_INTERFACE, 72 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 73 .bTerminalID = INPUT_TERMINAL_ID, 74 .wTerminalType = UAC_TERMINAL_STREAMING, 75 .bAssocTerminal = 0, 76 .wChannelConfig = 0x3, 77 }; 78 79 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); 80 81 #define FEATURE_UNIT_ID 2 82 static struct uac_feature_unit_descriptor_0 feature_unit_desc = { 83 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0), 84 .bDescriptorType = USB_DT_CS_INTERFACE, 85 .bDescriptorSubtype = UAC_FEATURE_UNIT, 86 .bUnitID = FEATURE_UNIT_ID, 87 .bSourceID = INPUT_TERMINAL_ID, 88 .bControlSize = 2, 89 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME), 90 }; 91 92 static struct usb_audio_control mute_control = { 93 .list = LIST_HEAD_INIT(mute_control.list), 94 .name = "Mute Control", 95 .type = UAC_FU_MUTE, 96 /* Todo: add real Mute control code */ 97 .set = generic_set_cmd, 98 .get = generic_get_cmd, 99 }; 100 101 static struct usb_audio_control volume_control = { 102 .list = LIST_HEAD_INIT(volume_control.list), 103 .name = "Volume Control", 104 .type = UAC_FU_VOLUME, 105 /* Todo: add real Volume control code */ 106 .set = generic_set_cmd, 107 .get = generic_get_cmd, 108 }; 109 110 static struct usb_audio_control_selector feature_unit = { 111 .list = LIST_HEAD_INIT(feature_unit.list), 112 .id = FEATURE_UNIT_ID, 113 .name = "Mute & Volume Control", 114 .type = UAC_FEATURE_UNIT, 115 .desc = (struct usb_descriptor_header *)&feature_unit_desc, 116 }; 117 118 #define OUTPUT_TERMINAL_ID 3 119 static struct uac1_output_terminal_descriptor output_terminal_desc = { 120 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 121 .bDescriptorType = USB_DT_CS_INTERFACE, 122 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 123 .bTerminalID = OUTPUT_TERMINAL_ID, 124 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, 125 .bAssocTerminal = FEATURE_UNIT_ID, 126 .bSourceID = FEATURE_UNIT_ID, 127 }; 128 129 /* B.4.1 Standard AS Interface Descriptor */ 130 static struct usb_interface_descriptor as_interface_alt_0_desc = { 131 .bLength = USB_DT_INTERFACE_SIZE, 132 .bDescriptorType = USB_DT_INTERFACE, 133 .bAlternateSetting = 0, 134 .bNumEndpoints = 0, 135 .bInterfaceClass = USB_CLASS_AUDIO, 136 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 137 }; 138 139 static struct usb_interface_descriptor as_interface_alt_1_desc = { 140 .bLength = USB_DT_INTERFACE_SIZE, 141 .bDescriptorType = USB_DT_INTERFACE, 142 .bAlternateSetting = 1, 143 .bNumEndpoints = 1, 144 .bInterfaceClass = USB_CLASS_AUDIO, 145 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 146 }; 147 148 /* B.4.2 Class-Specific AS Interface Descriptor */ 149 static struct uac1_as_header_descriptor as_header_desc = { 150 .bLength = UAC_DT_AS_HEADER_SIZE, 151 .bDescriptorType = USB_DT_CS_INTERFACE, 152 .bDescriptorSubtype = UAC_AS_GENERAL, 153 .bTerminalLink = INPUT_TERMINAL_ID, 154 .bDelay = 1, 155 .wFormatTag = UAC_FORMAT_TYPE_I_PCM, 156 }; 157 158 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); 159 160 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = { 161 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), 162 .bDescriptorType = USB_DT_CS_INTERFACE, 163 .bDescriptorSubtype = UAC_FORMAT_TYPE, 164 .bFormatType = UAC_FORMAT_TYPE_I, 165 .bSubframeSize = 2, 166 .bBitResolution = 16, 167 .bSamFreqType = 1, 168 }; 169 170 /* Standard ISO OUT Endpoint Descriptor */ 171 static struct usb_endpoint_descriptor as_out_ep_desc = { 172 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 173 .bDescriptorType = USB_DT_ENDPOINT, 174 .bEndpointAddress = USB_DIR_OUT, 175 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE 176 | USB_ENDPOINT_XFER_ISOC, 177 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), 178 .bInterval = 4, 179 }; 180 181 /* Class-specific AS ISO OUT Endpoint Descriptor */ 182 static struct uac_iso_endpoint_descriptor as_iso_out_desc = { 183 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 184 .bDescriptorType = USB_DT_CS_ENDPOINT, 185 .bDescriptorSubtype = UAC_EP_GENERAL, 186 .bmAttributes = 1, 187 .bLockDelayUnits = 1, 188 .wLockDelay = __constant_cpu_to_le16(1), 189 }; 190 191 static struct usb_descriptor_header *f_audio_desc[] = { 192 (struct usb_descriptor_header *)&ac_interface_desc, 193 (struct usb_descriptor_header *)&ac_header_desc, 194 195 (struct usb_descriptor_header *)&input_terminal_desc, 196 (struct usb_descriptor_header *)&output_terminal_desc, 197 (struct usb_descriptor_header *)&feature_unit_desc, 198 199 (struct usb_descriptor_header *)&as_interface_alt_0_desc, 200 (struct usb_descriptor_header *)&as_interface_alt_1_desc, 201 (struct usb_descriptor_header *)&as_header_desc, 202 203 (struct usb_descriptor_header *)&as_type_i_desc, 204 205 (struct usb_descriptor_header *)&as_out_ep_desc, 206 (struct usb_descriptor_header *)&as_iso_out_desc, 207 NULL, 208 }; 209 210 enum { 211 STR_AC_IF, 212 STR_INPUT_TERMINAL, 213 STR_INPUT_TERMINAL_CH_NAMES, 214 STR_FEAT_DESC_0, 215 STR_OUTPUT_TERMINAL, 216 STR_AS_IF_ALT0, 217 STR_AS_IF_ALT1, 218 }; 219 220 static struct usb_string strings_uac1[] = { 221 [STR_AC_IF].s = "AC Interface", 222 [STR_INPUT_TERMINAL].s = "Input terminal", 223 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels", 224 [STR_FEAT_DESC_0].s = "Volume control & mute", 225 [STR_OUTPUT_TERMINAL].s = "Output terminal", 226 [STR_AS_IF_ALT0].s = "AS Interface", 227 [STR_AS_IF_ALT1].s = "AS Interface", 228 { }, 229 }; 230 231 static struct usb_gadget_strings str_uac1 = { 232 .language = 0x0409, /* en-us */ 233 .strings = strings_uac1, 234 }; 235 236 static struct usb_gadget_strings *uac1_strings[] = { 237 &str_uac1, 238 NULL, 239 }; 240 241 /* 242 * This function is an ALSA sound card following USB Audio Class Spec 1.0. 243 */ 244 245 /*-------------------------------------------------------------------------*/ 246 struct f_audio_buf { 247 u8 *buf; 248 int actual; 249 struct list_head list; 250 }; 251 252 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) 253 { 254 struct f_audio_buf *copy_buf; 255 256 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC); 257 if (!copy_buf) 258 return ERR_PTR(-ENOMEM); 259 260 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); 261 if (!copy_buf->buf) { 262 kfree(copy_buf); 263 return ERR_PTR(-ENOMEM); 264 } 265 266 return copy_buf; 267 } 268 269 static void f_audio_buffer_free(struct f_audio_buf *audio_buf) 270 { 271 kfree(audio_buf->buf); 272 kfree(audio_buf); 273 } 274 /*-------------------------------------------------------------------------*/ 275 276 struct f_audio { 277 struct gaudio card; 278 279 u8 ac_intf, ac_alt; 280 u8 as_intf, as_alt; 281 282 /* endpoints handle full and/or high speeds */ 283 struct usb_ep *out_ep; 284 285 spinlock_t lock; 286 struct f_audio_buf *copy_buf; 287 struct work_struct playback_work; 288 struct list_head play_queue; 289 290 /* Control Set command */ 291 struct list_head cs; 292 u8 set_cmd; 293 struct usb_audio_control *set_con; 294 }; 295 296 static inline struct f_audio *func_to_audio(struct usb_function *f) 297 { 298 return container_of(f, struct f_audio, card.func); 299 } 300 301 /*-------------------------------------------------------------------------*/ 302 303 static void f_audio_playback_work(struct work_struct *data) 304 { 305 struct f_audio *audio = container_of(data, struct f_audio, 306 playback_work); 307 struct f_audio_buf *play_buf; 308 309 spin_lock_irq(&audio->lock); 310 if (list_empty(&audio->play_queue)) { 311 spin_unlock_irq(&audio->lock); 312 return; 313 } 314 play_buf = list_first_entry(&audio->play_queue, 315 struct f_audio_buf, list); 316 list_del(&play_buf->list); 317 spin_unlock_irq(&audio->lock); 318 319 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual); 320 f_audio_buffer_free(play_buf); 321 } 322 323 static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req) 324 { 325 struct f_audio *audio = req->context; 326 struct usb_composite_dev *cdev = audio->card.func.config->cdev; 327 struct f_audio_buf *copy_buf = audio->copy_buf; 328 struct f_uac1_legacy_opts *opts; 329 int audio_buf_size; 330 int err; 331 332 opts = container_of(audio->card.func.fi, struct f_uac1_legacy_opts, 333 func_inst); 334 audio_buf_size = opts->audio_buf_size; 335 336 if (!copy_buf) 337 return -EINVAL; 338 339 /* Copy buffer is full, add it to the play_queue */ 340 if (audio_buf_size - copy_buf->actual < req->actual) { 341 list_add_tail(©_buf->list, &audio->play_queue); 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 } 359 360 static 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 } 383 384 static 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 } 419 420 static 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 } 457 458 static 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 } 493 494 static 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 } 521 522 static int 523 f_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 } 573 574 static 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 } 654 655 static 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 } 670 671 static void f_audio_disable(struct usb_function *f) 672 { 673 return; 674 } 675 676 /*-------------------------------------------------------------------------*/ 677 678 static 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 */ 699 static int 700 f_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 status = -ENOMEM; 758 759 /* copy descriptors, and track endpoint copies */ 760 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, 761 NULL); 762 if (status) 763 goto fail; 764 return 0; 765 766 fail: 767 gaudio_cleanup(&audio->card); 768 return status; 769 } 770 771 /*-------------------------------------------------------------------------*/ 772 773 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) 774 { 775 con->data[cmd] = value; 776 777 return 0; 778 } 779 780 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) 781 { 782 return con->data[cmd]; 783 } 784 785 /* Todo: add more control selecotor dynamically */ 786 static int control_selector_init(struct f_audio *audio) 787 { 788 INIT_LIST_HEAD(&audio->cs); 789 list_add(&feature_unit.list, &audio->cs); 790 791 INIT_LIST_HEAD(&feature_unit.control); 792 list_add(&mute_control.list, &feature_unit.control); 793 list_add(&volume_control.list, &feature_unit.control); 794 795 volume_control.data[UAC__CUR] = 0xffc0; 796 volume_control.data[UAC__MIN] = 0xe3a0; 797 volume_control.data[UAC__MAX] = 0xfff0; 798 volume_control.data[UAC__RES] = 0x0030; 799 800 return 0; 801 } 802 803 static inline 804 struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item) 805 { 806 return container_of(to_config_group(item), struct f_uac1_legacy_opts, 807 func_inst.group); 808 } 809 810 static void f_uac1_attr_release(struct config_item *item) 811 { 812 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); 813 814 usb_put_function_instance(&opts->func_inst); 815 } 816 817 static struct configfs_item_operations f_uac1_item_ops = { 818 .release = f_uac1_attr_release, 819 }; 820 821 #define UAC1_INT_ATTRIBUTE(name) \ 822 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 823 char *page) \ 824 { \ 825 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 826 int result; \ 827 \ 828 mutex_lock(&opts->lock); \ 829 result = sprintf(page, "%u\n", opts->name); \ 830 mutex_unlock(&opts->lock); \ 831 \ 832 return result; \ 833 } \ 834 \ 835 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 836 const char *page, size_t len) \ 837 { \ 838 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 839 int ret; \ 840 u32 num; \ 841 \ 842 mutex_lock(&opts->lock); \ 843 if (opts->refcnt) { \ 844 ret = -EBUSY; \ 845 goto end; \ 846 } \ 847 \ 848 ret = kstrtou32(page, 0, &num); \ 849 if (ret) \ 850 goto end; \ 851 \ 852 opts->name = num; \ 853 ret = len; \ 854 \ 855 end: \ 856 mutex_unlock(&opts->lock); \ 857 return ret; \ 858 } \ 859 \ 860 CONFIGFS_ATTR(f_uac1_opts_, name) 861 862 UAC1_INT_ATTRIBUTE(req_buf_size); 863 UAC1_INT_ATTRIBUTE(req_count); 864 UAC1_INT_ATTRIBUTE(audio_buf_size); 865 866 #define UAC1_STR_ATTRIBUTE(name) \ 867 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 868 char *page) \ 869 { \ 870 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 871 int result; \ 872 \ 873 mutex_lock(&opts->lock); \ 874 result = sprintf(page, "%s\n", opts->name); \ 875 mutex_unlock(&opts->lock); \ 876 \ 877 return result; \ 878 } \ 879 \ 880 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 881 const char *page, size_t len) \ 882 { \ 883 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 884 int ret = -EBUSY; \ 885 char *tmp; \ 886 \ 887 mutex_lock(&opts->lock); \ 888 if (opts->refcnt) \ 889 goto end; \ 890 \ 891 tmp = kstrndup(page, len, GFP_KERNEL); \ 892 if (tmp) { \ 893 ret = -ENOMEM; \ 894 goto end; \ 895 } \ 896 if (opts->name##_alloc) \ 897 kfree(opts->name); \ 898 opts->name##_alloc = true; \ 899 opts->name = tmp; \ 900 ret = len; \ 901 \ 902 end: \ 903 mutex_unlock(&opts->lock); \ 904 return ret; \ 905 } \ 906 \ 907 CONFIGFS_ATTR(f_uac1_opts_, name) 908 909 UAC1_STR_ATTRIBUTE(fn_play); 910 UAC1_STR_ATTRIBUTE(fn_cap); 911 UAC1_STR_ATTRIBUTE(fn_cntl); 912 913 static struct configfs_attribute *f_uac1_attrs[] = { 914 &f_uac1_opts_attr_req_buf_size, 915 &f_uac1_opts_attr_req_count, 916 &f_uac1_opts_attr_audio_buf_size, 917 &f_uac1_opts_attr_fn_play, 918 &f_uac1_opts_attr_fn_cap, 919 &f_uac1_opts_attr_fn_cntl, 920 NULL, 921 }; 922 923 static const struct config_item_type f_uac1_func_type = { 924 .ct_item_ops = &f_uac1_item_ops, 925 .ct_attrs = f_uac1_attrs, 926 .ct_owner = THIS_MODULE, 927 }; 928 929 static void f_audio_free_inst(struct usb_function_instance *f) 930 { 931 struct f_uac1_legacy_opts *opts; 932 933 opts = container_of(f, struct f_uac1_legacy_opts, func_inst); 934 if (opts->fn_play_alloc) 935 kfree(opts->fn_play); 936 if (opts->fn_cap_alloc) 937 kfree(opts->fn_cap); 938 if (opts->fn_cntl_alloc) 939 kfree(opts->fn_cntl); 940 kfree(opts); 941 } 942 943 static struct usb_function_instance *f_audio_alloc_inst(void) 944 { 945 struct f_uac1_legacy_opts *opts; 946 947 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 948 if (!opts) 949 return ERR_PTR(-ENOMEM); 950 951 mutex_init(&opts->lock); 952 opts->func_inst.free_func_inst = f_audio_free_inst; 953 954 config_group_init_type_name(&opts->func_inst.group, "", 955 &f_uac1_func_type); 956 957 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; 958 opts->req_count = UAC1_REQ_COUNT; 959 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE; 960 opts->fn_play = FILE_PCM_PLAYBACK; 961 opts->fn_cap = FILE_PCM_CAPTURE; 962 opts->fn_cntl = FILE_CONTROL; 963 return &opts->func_inst; 964 } 965 966 static void f_audio_free(struct usb_function *f) 967 { 968 struct f_audio *audio = func_to_audio(f); 969 struct f_uac1_legacy_opts *opts; 970 971 gaudio_cleanup(&audio->card); 972 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 973 kfree(audio); 974 mutex_lock(&opts->lock); 975 --opts->refcnt; 976 mutex_unlock(&opts->lock); 977 } 978 979 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 980 { 981 usb_free_all_descriptors(f); 982 } 983 984 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) 985 { 986 struct f_audio *audio; 987 struct f_uac1_legacy_opts *opts; 988 989 /* allocate and initialize one new instance */ 990 audio = kzalloc(sizeof(*audio), GFP_KERNEL); 991 if (!audio) 992 return ERR_PTR(-ENOMEM); 993 994 audio->card.func.name = "g_audio"; 995 996 opts = container_of(fi, struct f_uac1_legacy_opts, func_inst); 997 mutex_lock(&opts->lock); 998 ++opts->refcnt; 999 mutex_unlock(&opts->lock); 1000 INIT_LIST_HEAD(&audio->play_queue); 1001 spin_lock_init(&audio->lock); 1002 1003 audio->card.func.bind = f_audio_bind; 1004 audio->card.func.unbind = f_audio_unbind; 1005 audio->card.func.set_alt = f_audio_set_alt; 1006 audio->card.func.get_alt = f_audio_get_alt; 1007 audio->card.func.setup = f_audio_setup; 1008 audio->card.func.disable = f_audio_disable; 1009 audio->card.func.free_func = f_audio_free; 1010 1011 control_selector_init(audio); 1012 1013 INIT_WORK(&audio->playback_work, f_audio_playback_work); 1014 1015 return &audio->card.func; 1016 } 1017 1018 DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc); 1019 MODULE_LICENSE("GPL"); 1020 MODULE_AUTHOR("Bryan Wu"); 1021