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(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 } 266 267 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 list_add_tail(©_buf->list, &audio->play_queue); 340 schedule_work(&audio->playback_work); 341 copy_buf = f_audio_buffer_alloc(audio_buf_size); 342 if (IS_ERR(copy_buf)) 343 return -ENOMEM; 344 } 345 346 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual); 347 copy_buf->actual += req->actual; 348 audio->copy_buf = copy_buf; 349 350 err = usb_ep_queue(ep, req, GFP_ATOMIC); 351 if (err) 352 ERROR(cdev, "%s queue req: %d\n", ep->name, err); 353 354 return 0; 355 356 } 357 358 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req) 359 { 360 struct f_audio *audio = req->context; 361 int status = req->status; 362 u32 data = 0; 363 struct usb_ep *out_ep = audio->out_ep; 364 365 switch (status) { 366 367 case 0: /* normal completion? */ 368 if (ep == out_ep) 369 f_audio_out_ep_complete(ep, req); 370 else if (audio->set_con) { 371 memcpy(&data, req->buf, req->length); 372 audio->set_con->set(audio->set_con, audio->set_cmd, 373 le16_to_cpu(data)); 374 audio->set_con = NULL; 375 } 376 break; 377 default: 378 break; 379 } 380 } 381 382 static int audio_set_intf_req(struct usb_function *f, 383 const struct usb_ctrlrequest *ctrl) 384 { 385 struct f_audio *audio = func_to_audio(f); 386 struct usb_composite_dev *cdev = f->config->cdev; 387 struct usb_request *req = cdev->req; 388 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 389 u16 len = le16_to_cpu(ctrl->wLength); 390 u16 w_value = le16_to_cpu(ctrl->wValue); 391 u8 con_sel = (w_value >> 8) & 0xFF; 392 u8 cmd = (ctrl->bRequest & 0x0F); 393 struct usb_audio_control_selector *cs; 394 struct usb_audio_control *con; 395 396 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 397 ctrl->bRequest, w_value, len, id); 398 399 list_for_each_entry(cs, &audio->cs, list) { 400 if (cs->id == id) { 401 list_for_each_entry(con, &cs->control, list) { 402 if (con->type == con_sel) { 403 audio->set_con = con; 404 break; 405 } 406 } 407 break; 408 } 409 } 410 411 audio->set_cmd = cmd; 412 req->context = audio; 413 req->complete = f_audio_complete; 414 415 return len; 416 } 417 418 static int audio_get_intf_req(struct usb_function *f, 419 const struct usb_ctrlrequest *ctrl) 420 { 421 struct f_audio *audio = func_to_audio(f); 422 struct usb_composite_dev *cdev = f->config->cdev; 423 struct usb_request *req = cdev->req; 424 int value = -EOPNOTSUPP; 425 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 426 u16 len = le16_to_cpu(ctrl->wLength); 427 u16 w_value = le16_to_cpu(ctrl->wValue); 428 u8 con_sel = (w_value >> 8) & 0xFF; 429 u8 cmd = (ctrl->bRequest & 0x0F); 430 struct usb_audio_control_selector *cs; 431 struct usb_audio_control *con; 432 433 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n", 434 ctrl->bRequest, w_value, len, id); 435 436 list_for_each_entry(cs, &audio->cs, list) { 437 if (cs->id == id) { 438 list_for_each_entry(con, &cs->control, list) { 439 if (con->type == con_sel && con->get) { 440 value = con->get(con, cmd); 441 break; 442 } 443 } 444 break; 445 } 446 } 447 448 req->context = audio; 449 req->complete = f_audio_complete; 450 len = min_t(size_t, sizeof(value), len); 451 memcpy(req->buf, &value, len); 452 453 return len; 454 } 455 456 static int audio_set_endpoint_req(struct usb_function *f, 457 const struct usb_ctrlrequest *ctrl) 458 { 459 struct usb_composite_dev *cdev = f->config->cdev; 460 int value = -EOPNOTSUPP; 461 u16 ep = le16_to_cpu(ctrl->wIndex); 462 u16 len = le16_to_cpu(ctrl->wLength); 463 u16 w_value = le16_to_cpu(ctrl->wValue); 464 465 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 466 ctrl->bRequest, w_value, len, ep); 467 468 switch (ctrl->bRequest) { 469 case UAC_SET_CUR: 470 value = len; 471 break; 472 473 case UAC_SET_MIN: 474 break; 475 476 case UAC_SET_MAX: 477 break; 478 479 case UAC_SET_RES: 480 break; 481 482 case UAC_SET_MEM: 483 break; 484 485 default: 486 break; 487 } 488 489 return value; 490 } 491 492 static int audio_get_endpoint_req(struct usb_function *f, 493 const struct usb_ctrlrequest *ctrl) 494 { 495 struct usb_composite_dev *cdev = f->config->cdev; 496 int value = -EOPNOTSUPP; 497 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); 498 u16 len = le16_to_cpu(ctrl->wLength); 499 u16 w_value = le16_to_cpu(ctrl->wValue); 500 501 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", 502 ctrl->bRequest, w_value, len, ep); 503 504 switch (ctrl->bRequest) { 505 case UAC_GET_CUR: 506 case UAC_GET_MIN: 507 case UAC_GET_MAX: 508 case UAC_GET_RES: 509 value = len; 510 break; 511 case UAC_GET_MEM: 512 break; 513 default: 514 break; 515 } 516 517 return value; 518 } 519 520 static int 521 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) 522 { 523 struct usb_composite_dev *cdev = f->config->cdev; 524 struct usb_request *req = cdev->req; 525 int value = -EOPNOTSUPP; 526 u16 w_index = le16_to_cpu(ctrl->wIndex); 527 u16 w_value = le16_to_cpu(ctrl->wValue); 528 u16 w_length = le16_to_cpu(ctrl->wLength); 529 530 /* composite driver infrastructure handles everything; interface 531 * activation uses set_alt(). 532 */ 533 switch (ctrl->bRequestType) { 534 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 535 value = audio_set_intf_req(f, ctrl); 536 break; 537 538 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE: 539 value = audio_get_intf_req(f, ctrl); 540 break; 541 542 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 543 value = audio_set_endpoint_req(f, ctrl); 544 break; 545 546 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT: 547 value = audio_get_endpoint_req(f, ctrl); 548 break; 549 550 default: 551 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n", 552 ctrl->bRequestType, ctrl->bRequest, 553 w_value, w_index, w_length); 554 } 555 556 /* respond with data transfer or status phase? */ 557 if (value >= 0) { 558 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n", 559 ctrl->bRequestType, ctrl->bRequest, 560 w_value, w_index, w_length); 561 req->zero = 0; 562 req->length = value; 563 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 564 if (value < 0) 565 ERROR(cdev, "audio response on err %d\n", value); 566 } 567 568 /* device either stalls (value < 0) or reports success */ 569 return value; 570 } 571 572 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt) 573 { 574 struct f_audio *audio = func_to_audio(f); 575 struct usb_composite_dev *cdev = f->config->cdev; 576 struct usb_ep *out_ep = audio->out_ep; 577 struct usb_request *req; 578 struct f_uac1_legacy_opts *opts; 579 int req_buf_size, req_count, audio_buf_size; 580 int i = 0, err = 0; 581 582 DBG(cdev, "intf %d, alt %d\n", intf, alt); 583 584 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 585 req_buf_size = opts->req_buf_size; 586 req_count = opts->req_count; 587 audio_buf_size = opts->audio_buf_size; 588 589 /* No i/f has more than 2 alt settings */ 590 if (alt > 1) { 591 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); 592 return -EINVAL; 593 } 594 595 if (intf == audio->ac_intf) { 596 /* Control I/f has only 1 AltSetting - 0 */ 597 if (alt) { 598 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__); 599 return -EINVAL; 600 } 601 return 0; 602 } else if (intf == audio->as_intf) { 603 if (alt == 1) { 604 err = config_ep_by_speed(cdev->gadget, f, out_ep); 605 if (err) 606 return err; 607 608 usb_ep_enable(out_ep); 609 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); 610 if (IS_ERR(audio->copy_buf)) 611 return -ENOMEM; 612 613 /* 614 * allocate a bunch of read buffers 615 * and queue them all at once. 616 */ 617 for (i = 0; i < req_count && err == 0; i++) { 618 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); 619 if (req) { 620 req->buf = kzalloc(req_buf_size, 621 GFP_ATOMIC); 622 if (req->buf) { 623 req->length = req_buf_size; 624 req->context = audio; 625 req->complete = 626 f_audio_complete; 627 err = usb_ep_queue(out_ep, 628 req, GFP_ATOMIC); 629 if (err) 630 ERROR(cdev, 631 "%s queue req: %d\n", 632 out_ep->name, err); 633 } else 634 err = -ENOMEM; 635 } else 636 err = -ENOMEM; 637 } 638 639 } else { 640 struct f_audio_buf *copy_buf = audio->copy_buf; 641 if (copy_buf) { 642 list_add_tail(©_buf->list, 643 &audio->play_queue); 644 schedule_work(&audio->playback_work); 645 } 646 } 647 audio->as_alt = alt; 648 } 649 650 return err; 651 } 652 653 static int f_audio_get_alt(struct usb_function *f, unsigned intf) 654 { 655 struct f_audio *audio = func_to_audio(f); 656 struct usb_composite_dev *cdev = f->config->cdev; 657 658 if (intf == audio->ac_intf) 659 return audio->ac_alt; 660 else if (intf == audio->as_intf) 661 return audio->as_alt; 662 else 663 ERROR(cdev, "%s:%d Invalid Interface %d!\n", 664 __func__, __LINE__, intf); 665 666 return -EINVAL; 667 } 668 669 static void f_audio_disable(struct usb_function *f) 670 { 671 return; 672 } 673 674 /*-------------------------------------------------------------------------*/ 675 676 static void f_audio_build_desc(struct f_audio *audio) 677 { 678 struct gaudio *card = &audio->card; 679 u8 *sam_freq; 680 int rate; 681 682 /* Set channel numbers */ 683 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); 684 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); 685 686 /* Set sample rates */ 687 rate = u_audio_get_playback_rate(card); 688 sam_freq = as_type_i_desc.tSamFreq[0]; 689 memcpy(sam_freq, &rate, 3); 690 691 /* Todo: Set Sample bits and other parameters */ 692 693 return; 694 } 695 696 /* audio function driver setup/binding */ 697 static int 698 f_audio_bind(struct usb_configuration *c, struct usb_function *f) 699 { 700 struct usb_composite_dev *cdev = c->cdev; 701 struct f_audio *audio = func_to_audio(f); 702 struct usb_string *us; 703 int status; 704 struct usb_ep *ep = NULL; 705 struct f_uac1_legacy_opts *audio_opts; 706 707 audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst); 708 audio->card.gadget = c->cdev->gadget; 709 /* set up ASLA audio devices */ 710 if (!audio_opts->bound) { 711 status = gaudio_setup(&audio->card); 712 if (status < 0) 713 return status; 714 audio_opts->bound = true; 715 } 716 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); 717 if (IS_ERR(us)) 718 return PTR_ERR(us); 719 ac_interface_desc.iInterface = us[STR_AC_IF].id; 720 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id; 721 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id; 722 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id; 723 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id; 724 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id; 725 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id; 726 727 728 f_audio_build_desc(audio); 729 730 /* allocate instance-specific interface IDs, and patch descriptors */ 731 status = usb_interface_id(c, f); 732 if (status < 0) 733 goto fail; 734 ac_interface_desc.bInterfaceNumber = status; 735 audio->ac_intf = status; 736 audio->ac_alt = 0; 737 738 status = usb_interface_id(c, f); 739 if (status < 0) 740 goto fail; 741 as_interface_alt_0_desc.bInterfaceNumber = status; 742 as_interface_alt_1_desc.bInterfaceNumber = status; 743 audio->as_intf = status; 744 audio->as_alt = 0; 745 746 status = -ENODEV; 747 748 /* allocate instance-specific endpoints */ 749 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 750 if (!ep) 751 goto fail; 752 audio->out_ep = ep; 753 audio->out_ep->desc = &as_out_ep_desc; 754 755 status = -ENOMEM; 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; 763 764 fail: 765 gaudio_cleanup(&audio->card); 766 return status; 767 } 768 769 /*-------------------------------------------------------------------------*/ 770 771 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) 772 { 773 con->data[cmd] = value; 774 775 return 0; 776 } 777 778 static 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 */ 784 static 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 } 800 801 static inline 802 struct 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 } 807 808 static 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 } 814 815 static struct configfs_item_operations f_uac1_item_ops = { 816 .release = f_uac1_attr_release, 817 }; 818 819 #define UAC1_INT_ATTRIBUTE(name) \ 820 static 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 \ 833 static 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 \ 853 end: \ 854 mutex_unlock(&opts->lock); \ 855 return ret; \ 856 } \ 857 \ 858 CONFIGFS_ATTR(f_uac1_opts_, name) 859 860 UAC1_INT_ATTRIBUTE(req_buf_size); 861 UAC1_INT_ATTRIBUTE(req_count); 862 UAC1_INT_ATTRIBUTE(audio_buf_size); 863 864 #define UAC1_STR_ATTRIBUTE(name) \ 865 static 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 \ 878 static 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 \ 900 end: \ 901 mutex_unlock(&opts->lock); \ 902 return ret; \ 903 } \ 904 \ 905 CONFIGFS_ATTR(f_uac1_opts_, name) 906 907 UAC1_STR_ATTRIBUTE(fn_play); 908 UAC1_STR_ATTRIBUTE(fn_cap); 909 UAC1_STR_ATTRIBUTE(fn_cntl); 910 911 static 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 }; 920 921 static 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 }; 926 927 static 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 } 940 941 static 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 } 963 964 static 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 } 976 977 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 978 { 979 usb_free_all_descriptors(f); 980 } 981 982 static 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 1016 DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc); 1017 MODULE_LICENSE("GPL"); 1018 MODULE_AUTHOR("Bryan Wu"); 1019