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 17 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); 18 static 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 */ 34 static 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 */ 46 DECLARE_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 */ 53 static 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 67 static 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 77 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); 78 79 #define FEATURE_UNIT_ID 2 80 static 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 90 static 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 99 static 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 }; 107 108 static 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 3 117 static 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 */ 128 static 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 }; 136 137 static 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 */ 147 static 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 }; 155 156 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); 157 158 static 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 */ 169 static 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 */ 180 static 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 }; 188 189 static 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 }; 207 208 enum { 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 }; 217 218 static 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 }; 228 229 static struct usb_gadget_strings str_uac1 = { 230 .language = 0x0409, /* en-us */ 231 .strings = strings_uac1, 232 }; 233 234 static 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 /*-------------------------------------------------------------------------*/ 244 struct f_audio_buf { 245 u8 *buf; 246 int actual; 247 struct list_head list; 248 }; 249 250 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) 251 { 252 struct f_audio_buf *copy_buf; 253 254 copy_buf = kzalloc_obj(*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 } 266 267 static void f_audio_buffer_free(struct f_audio_buf *audio_buf) 268 { 269 kfree(audio_buf->buf); 270 kfree(audio_buf); 271 } 272 /*-------------------------------------------------------------------------*/ 273 274 struct 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 }; 293 294 static 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 /*-------------------------------------------------------------------------*/ 300 301 static 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 } 320 321 static 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 } 359 360 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) 361 { 362 struct f_audio *audio = req->context; 363 struct usb_ep *out_ep = audio->out_ep; 364 365 switch (req->status) { 366 case 0: 367 if (ep == out_ep) { 368 f_audio_out_ep_complete(ep, req); 369 } else if (audio->set_con) { 370 struct usb_audio_control *con = audio->set_con; 371 u8 type = con->type; 372 u32 data; 373 bool valid_request = false; 374 375 switch (type) { 376 case UAC_FU_MUTE: { 377 u8 value; 378 379 if (req->actual == sizeof(value)) { 380 memcpy(&value, req->buf, sizeof(value)); 381 data = value; 382 valid_request = true; 383 } 384 break; 385 } 386 case UAC_FU_VOLUME: { 387 __le16 value; 388 389 if (req->actual == sizeof(value)) { 390 memcpy(&value, req->buf, sizeof(value)); 391 data = le16_to_cpu(value); 392 valid_request = true; 393 } 394 break; 395 } 396 } 397 398 if (valid_request) 399 con->set(con, audio->set_cmd, data); 400 else 401 usb_ep_set_halt(ep); 402 403 audio->set_con = NULL; 404 } 405 break; 406 default: 407 break; 408 } 409 } 410 411 static int audio_set_intf_req(struct usb_function *f, 412 const struct usb_ctrlrequest *ctrl) 413 { 414 struct f_audio *audio = func_to_audio(f); 415 struct usb_composite_dev *cdev = f->config->cdev; 416 struct usb_request *req = cdev->req; 417 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 418 u16 len = le16_to_cpu(ctrl->wLength); 419 u16 w_value = le16_to_cpu(ctrl->wValue); 420 u8 con_sel = (w_value >> 8) & 0xFF; 421 u8 cmd = (ctrl->bRequest & 0x0F); 422 struct usb_audio_control_selector *cs; 423 struct usb_audio_control *con; 424 425 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 426 ctrl->bRequest, w_value, len, id); 427 428 list_for_each_entry(cs, &audio->cs, list) { 429 if (cs->id == id) { 430 list_for_each_entry(con, &cs->control, list) { 431 if (con->type == con_sel) { 432 audio->set_con = con; 433 break; 434 } 435 } 436 break; 437 } 438 } 439 440 audio->set_cmd = cmd; 441 req->context = audio; 442 req->complete = f_audio_complete; 443 444 return len; 445 } 446 447 static int audio_get_intf_req(struct usb_function *f, 448 const struct usb_ctrlrequest *ctrl) 449 { 450 struct f_audio *audio = func_to_audio(f); 451 struct usb_composite_dev *cdev = f->config->cdev; 452 struct usb_request *req = cdev->req; 453 int value = -EOPNOTSUPP; 454 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 455 u16 len = le16_to_cpu(ctrl->wLength); 456 u16 w_value = le16_to_cpu(ctrl->wValue); 457 u8 con_sel = (w_value >> 8) & 0xFF; 458 u8 cmd = (ctrl->bRequest & 0x0F); 459 struct usb_audio_control_selector *cs; 460 struct usb_audio_control *con; 461 462 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 463 ctrl->bRequest, w_value, len, id); 464 465 list_for_each_entry(cs, &audio->cs, list) { 466 if (cs->id == id) { 467 list_for_each_entry(con, &cs->control, list) { 468 if (con->type == con_sel && con->get) { 469 value = con->get(con, cmd); 470 break; 471 } 472 } 473 break; 474 } 475 } 476 477 req->context = audio; 478 req->complete = f_audio_complete; 479 len = min_t(size_t, sizeof(value), len); 480 memcpy(req->buf, &value, len); 481 482 return len; 483 } 484 485 static int audio_set_endpoint_req(struct usb_function *f, 486 const struct usb_ctrlrequest *ctrl) 487 { 488 struct usb_composite_dev *cdev = f->config->cdev; 489 int value = -EOPNOTSUPP; 490 u16 ep = le16_to_cpu(ctrl->wIndex); 491 u16 len = le16_to_cpu(ctrl->wLength); 492 u16 w_value = le16_to_cpu(ctrl->wValue); 493 494 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 495 ctrl->bRequest, w_value, len, ep); 496 497 switch (ctrl->bRequest) { 498 case UAC_SET_CUR: 499 value = len; 500 break; 501 502 case UAC_SET_MIN: 503 break; 504 505 case UAC_SET_MAX: 506 break; 507 508 case UAC_SET_RES: 509 break; 510 511 case UAC_SET_MEM: 512 break; 513 514 default: 515 break; 516 } 517 518 return value; 519 } 520 521 static int audio_get_endpoint_req(struct usb_function *f, 522 const struct usb_ctrlrequest *ctrl) 523 { 524 struct usb_composite_dev *cdev = f->config->cdev; 525 int value = -EOPNOTSUPP; 526 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 527 u16 len = le16_to_cpu(ctrl->wLength); 528 u16 w_value = le16_to_cpu(ctrl->wValue); 529 530 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 531 ctrl->bRequest, w_value, len, ep); 532 533 switch (ctrl->bRequest) { 534 case UAC_GET_CUR: 535 case UAC_GET_MIN: 536 case UAC_GET_MAX: 537 case UAC_GET_RES: 538 value = len; 539 break; 540 case UAC_GET_MEM: 541 break; 542 default: 543 break; 544 } 545 546 return value; 547 } 548 549 static int 550 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 551 { 552 struct usb_composite_dev *cdev = f->config->cdev; 553 struct usb_request *req = cdev->req; 554 int value = -EOPNOTSUPP; 555 u16 w_index = le16_to_cpu(ctrl->wIndex); 556 u16 w_value = le16_to_cpu(ctrl->wValue); 557 u16 w_length = le16_to_cpu(ctrl->wLength); 558 559 /* composite driver infrastructure handles everything; interface 560 * activation uses set_alt(). 561 */ 562 switch (ctrl->bRequestType) { 563 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 564 value = audio_set_intf_req(f, ctrl); 565 break; 566 567 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 568 value = audio_get_intf_req(f, ctrl); 569 break; 570 571 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 572 value = audio_set_endpoint_req(f, ctrl); 573 break; 574 575 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 576 value = audio_get_endpoint_req(f, ctrl); 577 break; 578 579 default: 580 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", 581 ctrl->bRequestType, ctrl->bRequest, 582 w_value, w_index, w_length); 583 } 584 585 /* respond with data transfer or status phase? */ 586 if (value >= 0) { 587 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", 588 ctrl->bRequestType, ctrl->bRequest, 589 w_value, w_index, w_length); 590 req->zero = 0; 591 req->length = value; 592 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 593 if (value < 0) 594 ERROR(cdev, "audio response on err %d\n", value); 595 } 596 597 /* device either stalls (value < 0) or reports success */ 598 return value; 599 } 600 601 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 602 { 603 struct f_audio *audio = func_to_audio(f); 604 struct usb_composite_dev *cdev = f->config->cdev; 605 struct usb_ep *out_ep = audio->out_ep; 606 struct usb_request *req; 607 struct f_uac1_legacy_opts *opts; 608 int req_buf_size, req_count, audio_buf_size; 609 int i = 0, err = 0; 610 611 DBG(cdev, "intf %d, alt %d\n", intf, alt); 612 613 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 614 req_buf_size = opts->req_buf_size; 615 req_count = opts->req_count; 616 audio_buf_size = opts->audio_buf_size; 617 618 /* No i/f has more than 2 alt settings */ 619 if (alt > 1) { 620 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); 621 return -EINVAL; 622 } 623 624 if (intf == audio->ac_intf) { 625 /* Control I/f has only 1 AltSetting - 0 */ 626 if (alt) { 627 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); 628 return -EINVAL; 629 } 630 return 0; 631 } else if (intf == audio->as_intf) { 632 if (alt == 1) { 633 err = config_ep_by_speed(cdev->gadget, f, out_ep); 634 if (err) 635 return err; 636 637 usb_ep_enable(out_ep); 638 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); 639 if (IS_ERR(audio->copy_buf)) 640 return -ENOMEM; 641 642 /* 643 * allocate a bunch of read buffers 644 * and queue them all at once. 645 */ 646 for (i = 0; i < req_count && err == 0; i++) { 647 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); 648 if (req) { 649 req->buf = kzalloc(req_buf_size, 650 GFP_ATOMIC); 651 if (req->buf) { 652 req->length = req_buf_size; 653 req->context = audio; 654 req->complete = 655 f_audio_complete; 656 err = usb_ep_queue(out_ep, 657 req, GFP_ATOMIC); 658 if (err) 659 ERROR(cdev, 660 "%s queue req: %d\n", 661 out_ep->name, err); 662 } else 663 err = -ENOMEM; 664 } else 665 err = -ENOMEM; 666 } 667 668 } else { 669 struct f_audio_buf *copy_buf = audio->copy_buf; 670 if (copy_buf) { 671 list_add_tail(©_buf->list, 672 &audio->play_queue); 673 schedule_work(&audio->playback_work); 674 } 675 } 676 audio->as_alt = alt; 677 } 678 679 return err; 680 } 681 682 static int f_audio_get_alt(struct usb_function *f, unsigned intf) 683 { 684 struct f_audio *audio = func_to_audio(f); 685 struct usb_composite_dev *cdev = f->config->cdev; 686 687 if (intf == audio->ac_intf) 688 return audio->ac_alt; 689 else if (intf == audio->as_intf) 690 return audio->as_alt; 691 else 692 ERROR(cdev, "%s:%d Invalid Interface %d!\n", 693 __func__, __LINE__, intf); 694 695 return -EINVAL; 696 } 697 698 static void f_audio_disable(struct usb_function *f) 699 { 700 return; 701 } 702 703 /*-------------------------------------------------------------------------*/ 704 705 static void f_audio_build_desc(struct f_audio *audio) 706 { 707 struct gaudio *card = &audio->card; 708 u8 *sam_freq; 709 int rate; 710 711 /* Set channel numbers */ 712 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); 713 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); 714 715 /* Set sample rates */ 716 rate = u_audio_get_playback_rate(card); 717 sam_freq = as_type_i_desc.tSamFreq[0]; 718 memcpy(sam_freq, &rate, 3); 719 720 /* Todo: Set Sample bits and other parameters */ 721 722 return; 723 } 724 725 /* audio function driver setup/binding */ 726 static int 727 f_audio_bind(struct usb_configuration *c, struct usb_function *f) 728 { 729 struct usb_composite_dev *cdev = c->cdev; 730 struct f_audio *audio = func_to_audio(f); 731 struct usb_string *us; 732 int status; 733 struct usb_ep *ep = NULL; 734 struct f_uac1_legacy_opts *audio_opts; 735 736 audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 737 audio->card.gadget = c->cdev->gadget; 738 /* set up ASLA audio devices */ 739 if (!audio_opts->bound) { 740 status = gaudio_setup(&audio->card); 741 if (status < 0) 742 return status; 743 audio_opts->bound = true; 744 } 745 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); 746 if (IS_ERR(us)) 747 return PTR_ERR(us); 748 ac_interface_desc.iInterface = us[STR_AC_IF].id; 749 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id; 750 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id; 751 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id; 752 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id; 753 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id; 754 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id; 755 756 757 f_audio_build_desc(audio); 758 759 /* allocate instance-specific interface IDs, and patch descriptors */ 760 status = usb_interface_id(c, f); 761 if (status < 0) 762 goto fail; 763 ac_interface_desc.bInterfaceNumber = status; 764 audio->ac_intf = status; 765 audio->ac_alt = 0; 766 767 status = usb_interface_id(c, f); 768 if (status < 0) 769 goto fail; 770 as_interface_alt_0_desc.bInterfaceNumber = status; 771 as_interface_alt_1_desc.bInterfaceNumber = status; 772 audio->as_intf = status; 773 audio->as_alt = 0; 774 775 status = -ENODEV; 776 777 /* allocate instance-specific endpoints */ 778 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 779 if (!ep) 780 goto fail; 781 audio->out_ep = ep; 782 audio->out_ep->desc = &as_out_ep_desc; 783 784 /* copy descriptors, and track endpoint copies */ 785 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, 786 NULL); 787 if (status) 788 goto fail; 789 return 0; 790 791 fail: 792 gaudio_cleanup(&audio->card); 793 return status; 794 } 795 796 /*-------------------------------------------------------------------------*/ 797 798 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) 799 { 800 con->data[cmd] = value; 801 802 return 0; 803 } 804 805 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) 806 { 807 return con->data[cmd]; 808 } 809 810 /* Todo: add more control selecotor dynamically */ 811 static int control_selector_init(struct f_audio *audio) 812 { 813 INIT_LIST_HEAD(&audio->cs); 814 list_add(&feature_unit.list, &audio->cs); 815 816 INIT_LIST_HEAD(&feature_unit.control); 817 list_add(&mute_control.list, &feature_unit.control); 818 list_add(&volume_control.list, &feature_unit.control); 819 820 volume_control.data[UAC__CUR] = 0xffc0; 821 volume_control.data[UAC__MIN] = 0xe3a0; 822 volume_control.data[UAC__MAX] = 0xfff0; 823 volume_control.data[UAC__RES] = 0x0030; 824 825 return 0; 826 } 827 828 static inline 829 struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item) 830 { 831 return container_of(to_config_group(item), struct f_uac1_legacy_opts, 832 func_inst.group); 833 } 834 835 static void f_uac1_attr_release(struct config_item *item) 836 { 837 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); 838 839 usb_put_function_instance(&opts->func_inst); 840 } 841 842 static const struct configfs_item_operations f_uac1_item_ops = { 843 .release = f_uac1_attr_release, 844 }; 845 846 #define UAC1_INT_ATTRIBUTE(name) \ 847 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 848 char *page) \ 849 { \ 850 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 851 int result; \ 852 \ 853 mutex_lock(&opts->lock); \ 854 result = sprintf(page, "%u\n", opts->name); \ 855 mutex_unlock(&opts->lock); \ 856 \ 857 return result; \ 858 } \ 859 \ 860 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 861 const char *page, size_t len) \ 862 { \ 863 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 864 int ret; \ 865 u32 num; \ 866 \ 867 mutex_lock(&opts->lock); \ 868 if (opts->refcnt) { \ 869 ret = -EBUSY; \ 870 goto end; \ 871 } \ 872 \ 873 ret = kstrtou32(page, 0, &num); \ 874 if (ret) \ 875 goto end; \ 876 \ 877 opts->name = num; \ 878 ret = len; \ 879 \ 880 end: \ 881 mutex_unlock(&opts->lock); \ 882 return ret; \ 883 } \ 884 \ 885 CONFIGFS_ATTR(f_uac1_opts_, name) 886 887 UAC1_INT_ATTRIBUTE(req_buf_size); 888 UAC1_INT_ATTRIBUTE(req_count); 889 UAC1_INT_ATTRIBUTE(audio_buf_size); 890 891 #define UAC1_STR_ATTRIBUTE(name) \ 892 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 893 char *page) \ 894 { \ 895 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 896 int result; \ 897 \ 898 mutex_lock(&opts->lock); \ 899 result = sprintf(page, "%s\n", opts->name); \ 900 mutex_unlock(&opts->lock); \ 901 \ 902 return result; \ 903 } \ 904 \ 905 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 906 const char *page, size_t len) \ 907 { \ 908 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \ 909 int ret = -EBUSY; \ 910 char *tmp; \ 911 \ 912 mutex_lock(&opts->lock); \ 913 if (opts->refcnt) \ 914 goto end; \ 915 \ 916 tmp = kstrndup(page, len, GFP_KERNEL); \ 917 if (tmp) { \ 918 ret = -ENOMEM; \ 919 goto end; \ 920 } \ 921 if (opts->name##_alloc) \ 922 kfree(opts->name); \ 923 opts->name##_alloc = true; \ 924 opts->name = tmp; \ 925 ret = len; \ 926 \ 927 end: \ 928 mutex_unlock(&opts->lock); \ 929 return ret; \ 930 } \ 931 \ 932 CONFIGFS_ATTR(f_uac1_opts_, name) 933 934 UAC1_STR_ATTRIBUTE(fn_play); 935 UAC1_STR_ATTRIBUTE(fn_cap); 936 UAC1_STR_ATTRIBUTE(fn_cntl); 937 938 static struct configfs_attribute *f_uac1_attrs[] = { 939 &f_uac1_opts_attr_req_buf_size, 940 &f_uac1_opts_attr_req_count, 941 &f_uac1_opts_attr_audio_buf_size, 942 &f_uac1_opts_attr_fn_play, 943 &f_uac1_opts_attr_fn_cap, 944 &f_uac1_opts_attr_fn_cntl, 945 NULL, 946 }; 947 948 static const struct config_item_type f_uac1_func_type = { 949 .ct_item_ops = &f_uac1_item_ops, 950 .ct_attrs = f_uac1_attrs, 951 .ct_owner = THIS_MODULE, 952 }; 953 954 static void f_audio_free_inst(struct usb_function_instance *f) 955 { 956 struct f_uac1_legacy_opts *opts; 957 958 opts = container_of(f, struct f_uac1_legacy_opts, func_inst); 959 if (opts->fn_play_alloc) 960 kfree(opts->fn_play); 961 if (opts->fn_cap_alloc) 962 kfree(opts->fn_cap); 963 if (opts->fn_cntl_alloc) 964 kfree(opts->fn_cntl); 965 kfree(opts); 966 } 967 968 static struct usb_function_instance *f_audio_alloc_inst(void) 969 { 970 struct f_uac1_legacy_opts *opts; 971 972 opts = kzalloc_obj(*opts); 973 if (!opts) 974 return ERR_PTR(-ENOMEM); 975 976 mutex_init(&opts->lock); 977 opts->func_inst.free_func_inst = f_audio_free_inst; 978 979 config_group_init_type_name(&opts->func_inst.group, "", 980 &f_uac1_func_type); 981 982 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; 983 opts->req_count = UAC1_REQ_COUNT; 984 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE; 985 opts->fn_play = FILE_PCM_PLAYBACK; 986 opts->fn_cap = FILE_PCM_CAPTURE; 987 opts->fn_cntl = FILE_CONTROL; 988 return &opts->func_inst; 989 } 990 991 static void f_audio_free(struct usb_function *f) 992 { 993 struct f_audio *audio = func_to_audio(f); 994 struct f_uac1_legacy_opts *opts; 995 996 gaudio_cleanup(&audio->card); 997 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 998 kfree(audio); 999 mutex_lock(&opts->lock); 1000 --opts->refcnt; 1001 mutex_unlock(&opts->lock); 1002 } 1003 1004 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 1005 { 1006 usb_free_all_descriptors(f); 1007 } 1008 1009 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) 1010 { 1011 struct f_audio *audio; 1012 struct f_uac1_legacy_opts *opts; 1013 1014 /* allocate and initialize one new instance */ 1015 audio = kzalloc_obj(*audio); 1016 if (!audio) 1017 return ERR_PTR(-ENOMEM); 1018 1019 audio->card.func.name = "g_audio"; 1020 1021 opts = container_of(fi, struct f_uac1_legacy_opts, func_inst); 1022 mutex_lock(&opts->lock); 1023 ++opts->refcnt; 1024 mutex_unlock(&opts->lock); 1025 INIT_LIST_HEAD(&audio->play_queue); 1026 spin_lock_init(&audio->lock); 1027 1028 audio->card.func.bind = f_audio_bind; 1029 audio->card.func.unbind = f_audio_unbind; 1030 audio->card.func.set_alt = f_audio_set_alt; 1031 audio->card.func.get_alt = f_audio_get_alt; 1032 audio->card.func.setup = f_audio_setup; 1033 audio->card.func.disable = f_audio_disable; 1034 audio->card.func.free_func = f_audio_free; 1035 1036 control_selector_init(audio); 1037 1038 INIT_WORK(&audio->playback_work, f_audio_playback_work); 1039 1040 return &audio->card.func; 1041 } 1042 1043 DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc); 1044 MODULE_DESCRIPTION("USB Audio class function driver"); 1045 MODULE_LICENSE("GPL"); 1046 MODULE_AUTHOR("Bryan Wu"); 1047