1 /* 2 * f_audio.c -- USB Audio class function driver 3 * 4 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> 5 * Copyright (C) 2008 Analog Devices, Inc 6 * 7 * Enter bugs at http://blackfin.uclinux.org/ 8 * 9 * Licensed under the GPL-2 or later. 10 */ 11 12 #include <linux/slab.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/atomic.h> 17 18 #include "u_uac1.h" 19 20 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value); 21 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd); 22 23 /* 24 * DESCRIPTORS ... most are static, but strings and full 25 * configuration descriptors are built on demand. 26 */ 27 28 /* 29 * We have two interfaces- AudioControl and AudioStreaming 30 * TODO: only supcard playback currently 31 */ 32 #define F_AUDIO_AC_INTERFACE 0 33 #define F_AUDIO_AS_INTERFACE 1 34 #define F_AUDIO_NUM_INTERFACES 1 35 36 /* B.3.1 Standard AC Interface Descriptor */ 37 static struct usb_interface_descriptor ac_interface_desc = { 38 .bLength = USB_DT_INTERFACE_SIZE, 39 .bDescriptorType = USB_DT_INTERFACE, 40 .bNumEndpoints = 0, 41 .bInterfaceClass = USB_CLASS_AUDIO, 42 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 43 }; 44 45 /* 46 * The number of AudioStreaming and MIDIStreaming interfaces 47 * in the Audio Interface Collection 48 */ 49 DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); 50 51 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES) 52 /* 1 input terminal, 1 output terminal and 1 feature unit */ 53 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \ 54 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0)) 55 /* B.3.2 Class-Specific AC Interface Descriptor */ 56 static struct uac1_ac_header_descriptor_1 ac_header_desc = { 57 .bLength = UAC_DT_AC_HEADER_LENGTH, 58 .bDescriptorType = USB_DT_CS_INTERFACE, 59 .bDescriptorSubtype = UAC_HEADER, 60 .bcdADC = __constant_cpu_to_le16(0x0100), 61 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH), 62 .bInCollection = F_AUDIO_NUM_INTERFACES, 63 .baInterfaceNr = { 64 /* Interface number of the first AudioStream interface */ 65 [0] = 1, 66 } 67 }; 68 69 #define INPUT_TERMINAL_ID 1 70 static struct uac_input_terminal_descriptor input_terminal_desc = { 71 .bLength = UAC_DT_INPUT_TERMINAL_SIZE, 72 .bDescriptorType = USB_DT_CS_INTERFACE, 73 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 74 .bTerminalID = INPUT_TERMINAL_ID, 75 .wTerminalType = UAC_TERMINAL_STREAMING, 76 .bAssocTerminal = 0, 77 .wChannelConfig = 0x3, 78 }; 79 80 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0); 81 82 #define FEATURE_UNIT_ID 2 83 static struct uac_feature_unit_descriptor_0 feature_unit_desc = { 84 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0), 85 .bDescriptorType = USB_DT_CS_INTERFACE, 86 .bDescriptorSubtype = UAC_FEATURE_UNIT, 87 .bUnitID = FEATURE_UNIT_ID, 88 .bSourceID = INPUT_TERMINAL_ID, 89 .bControlSize = 2, 90 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME), 91 }; 92 93 static struct usb_audio_control mute_control = { 94 .list = LIST_HEAD_INIT(mute_control.list), 95 .name = "Mute Control", 96 .type = UAC_FU_MUTE, 97 /* Todo: add real Mute control code */ 98 .set = generic_set_cmd, 99 .get = generic_get_cmd, 100 }; 101 102 static struct usb_audio_control volume_control = { 103 .list = LIST_HEAD_INIT(volume_control.list), 104 .name = "Volume Control", 105 .type = UAC_FU_VOLUME, 106 /* Todo: add real Volume control code */ 107 .set = generic_set_cmd, 108 .get = generic_get_cmd, 109 }; 110 111 static struct usb_audio_control_selector feature_unit = { 112 .list = LIST_HEAD_INIT(feature_unit.list), 113 .id = FEATURE_UNIT_ID, 114 .name = "Mute & Volume Control", 115 .type = UAC_FEATURE_UNIT, 116 .desc = (struct usb_descriptor_header *)&feature_unit_desc, 117 }; 118 119 #define OUTPUT_TERMINAL_ID 3 120 static struct uac1_output_terminal_descriptor output_terminal_desc = { 121 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE, 122 .bDescriptorType = USB_DT_CS_INTERFACE, 123 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 124 .bTerminalID = OUTPUT_TERMINAL_ID, 125 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER, 126 .bAssocTerminal = FEATURE_UNIT_ID, 127 .bSourceID = FEATURE_UNIT_ID, 128 }; 129 130 /* B.4.1 Standard AS Interface Descriptor */ 131 static struct usb_interface_descriptor as_interface_alt_0_desc = { 132 .bLength = USB_DT_INTERFACE_SIZE, 133 .bDescriptorType = USB_DT_INTERFACE, 134 .bAlternateSetting = 0, 135 .bNumEndpoints = 0, 136 .bInterfaceClass = USB_CLASS_AUDIO, 137 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 138 }; 139 140 static struct usb_interface_descriptor as_interface_alt_1_desc = { 141 .bLength = USB_DT_INTERFACE_SIZE, 142 .bDescriptorType = USB_DT_INTERFACE, 143 .bAlternateSetting = 1, 144 .bNumEndpoints = 1, 145 .bInterfaceClass = USB_CLASS_AUDIO, 146 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 147 }; 148 149 /* B.4.2 Class-Specific AS Interface Descriptor */ 150 static struct uac1_as_header_descriptor as_header_desc = { 151 .bLength = UAC_DT_AS_HEADER_SIZE, 152 .bDescriptorType = USB_DT_CS_INTERFACE, 153 .bDescriptorSubtype = UAC_AS_GENERAL, 154 .bTerminalLink = INPUT_TERMINAL_ID, 155 .bDelay = 1, 156 .wFormatTag = UAC_FORMAT_TYPE_I_PCM, 157 }; 158 159 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1); 160 161 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = { 162 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1), 163 .bDescriptorType = USB_DT_CS_INTERFACE, 164 .bDescriptorSubtype = UAC_FORMAT_TYPE, 165 .bFormatType = UAC_FORMAT_TYPE_I, 166 .bSubframeSize = 2, 167 .bBitResolution = 16, 168 .bSamFreqType = 1, 169 }; 170 171 /* Standard ISO OUT Endpoint Descriptor */ 172 static struct usb_endpoint_descriptor as_out_ep_desc = { 173 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, 174 .bDescriptorType = USB_DT_ENDPOINT, 175 .bEndpointAddress = USB_DIR_OUT, 176 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE 177 | USB_ENDPOINT_XFER_ISOC, 178 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE), 179 .bInterval = 4, 180 }; 181 182 /* Class-specific AS ISO OUT Endpoint Descriptor */ 183 static struct uac_iso_endpoint_descriptor as_iso_out_desc = { 184 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE, 185 .bDescriptorType = USB_DT_CS_ENDPOINT, 186 .bDescriptorSubtype = UAC_EP_GENERAL, 187 .bmAttributes = 1, 188 .bLockDelayUnits = 1, 189 .wLockDelay = __constant_cpu_to_le16(1), 190 }; 191 192 static struct usb_descriptor_header *f_audio_desc[] = { 193 (struct usb_descriptor_header *)&ac_interface_desc, 194 (struct usb_descriptor_header *)&ac_header_desc, 195 196 (struct usb_descriptor_header *)&input_terminal_desc, 197 (struct usb_descriptor_header *)&output_terminal_desc, 198 (struct usb_descriptor_header *)&feature_unit_desc, 199 200 (struct usb_descriptor_header *)&as_interface_alt_0_desc, 201 (struct usb_descriptor_header *)&as_interface_alt_1_desc, 202 (struct usb_descriptor_header *)&as_header_desc, 203 204 (struct usb_descriptor_header *)&as_type_i_desc, 205 206 (struct usb_descriptor_header *)&as_out_ep_desc, 207 (struct usb_descriptor_header *)&as_iso_out_desc, 208 NULL, 209 }; 210 211 enum { 212 STR_AC_IF, 213 STR_INPUT_TERMINAL, 214 STR_INPUT_TERMINAL_CH_NAMES, 215 STR_FEAT_DESC_0, 216 STR_OUTPUT_TERMINAL, 217 STR_AS_IF_ALT0, 218 STR_AS_IF_ALT1, 219 }; 220 221 static struct usb_string strings_uac1[] = { 222 [STR_AC_IF].s = "AC Interface", 223 [STR_INPUT_TERMINAL].s = "Input terminal", 224 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels", 225 [STR_FEAT_DESC_0].s = "Volume control & mute", 226 [STR_OUTPUT_TERMINAL].s = "Output terminal", 227 [STR_AS_IF_ALT0].s = "AS Interface", 228 [STR_AS_IF_ALT1].s = "AS Interface", 229 { }, 230 }; 231 232 static struct usb_gadget_strings str_uac1 = { 233 .language = 0x0409, /* en-us */ 234 .strings = strings_uac1, 235 }; 236 237 static struct usb_gadget_strings *uac1_strings[] = { 238 &str_uac1, 239 NULL, 240 }; 241 242 /* 243 * This function is an ALSA sound card following USB Audio Class Spec 1.0. 244 */ 245 246 /*-------------------------------------------------------------------------*/ 247 struct f_audio_buf { 248 u8 *buf; 249 int actual; 250 struct list_head list; 251 }; 252 253 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size) 254 { 255 struct f_audio_buf *copy_buf; 256 257 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC); 258 if (!copy_buf) 259 return ERR_PTR(-ENOMEM); 260 261 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC); 262 if (!copy_buf->buf) { 263 kfree(copy_buf); 264 return ERR_PTR(-ENOMEM); 265 } 266 267 return copy_buf; 268 } 269 270 static void f_audio_buffer_free(struct f_audio_buf *audio_buf) 271 { 272 kfree(audio_buf->buf); 273 kfree(audio_buf); 274 } 275 /*-------------------------------------------------------------------------*/ 276 277 struct f_audio { 278 struct gaudio card; 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_opts *opts; 327 int audio_buf_size; 328 int err; 329 330 opts = container_of(audio->card.func.fi, struct f_uac1_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_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_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 if (intf == 1) { 590 if (alt == 1) { 591 err = config_ep_by_speed(cdev->gadget, f, out_ep); 592 if (err) 593 return err; 594 595 usb_ep_enable(out_ep); 596 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size); 597 if (IS_ERR(audio->copy_buf)) 598 return -ENOMEM; 599 600 /* 601 * allocate a bunch of read buffers 602 * and queue them all at once. 603 */ 604 for (i = 0; i < req_count && err == 0; i++) { 605 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC); 606 if (req) { 607 req->buf = kzalloc(req_buf_size, 608 GFP_ATOMIC); 609 if (req->buf) { 610 req->length = req_buf_size; 611 req->context = audio; 612 req->complete = 613 f_audio_complete; 614 err = usb_ep_queue(out_ep, 615 req, GFP_ATOMIC); 616 if (err) 617 ERROR(cdev, 618 "%s queue req: %d\n", 619 out_ep->name, err); 620 } else 621 err = -ENOMEM; 622 } else 623 err = -ENOMEM; 624 } 625 626 } else { 627 struct f_audio_buf *copy_buf = audio->copy_buf; 628 if (copy_buf) { 629 list_add_tail(©_buf->list, 630 &audio->play_queue); 631 schedule_work(&audio->playback_work); 632 } 633 } 634 } 635 636 return err; 637 } 638 639 static void f_audio_disable(struct usb_function *f) 640 { 641 return; 642 } 643 644 /*-------------------------------------------------------------------------*/ 645 646 static void f_audio_build_desc(struct f_audio *audio) 647 { 648 struct gaudio *card = &audio->card; 649 u8 *sam_freq; 650 int rate; 651 652 /* Set channel numbers */ 653 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card); 654 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card); 655 656 /* Set sample rates */ 657 rate = u_audio_get_playback_rate(card); 658 sam_freq = as_type_i_desc.tSamFreq[0]; 659 memcpy(sam_freq, &rate, 3); 660 661 /* Todo: Set Sample bits and other parameters */ 662 663 return; 664 } 665 666 /* audio function driver setup/binding */ 667 static int 668 f_audio_bind(struct usb_configuration *c, struct usb_function *f) 669 { 670 struct usb_composite_dev *cdev = c->cdev; 671 struct f_audio *audio = func_to_audio(f); 672 struct usb_string *us; 673 int status; 674 struct usb_ep *ep = NULL; 675 struct f_uac1_opts *audio_opts; 676 677 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst); 678 audio->card.gadget = c->cdev->gadget; 679 /* set up ASLA audio devices */ 680 if (!audio_opts->bound) { 681 status = gaudio_setup(&audio->card); 682 if (status < 0) 683 return status; 684 audio_opts->bound = true; 685 } 686 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); 687 if (IS_ERR(us)) 688 return PTR_ERR(us); 689 ac_interface_desc.iInterface = us[STR_AC_IF].id; 690 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id; 691 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id; 692 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id; 693 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id; 694 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id; 695 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id; 696 697 698 f_audio_build_desc(audio); 699 700 /* allocate instance-specific interface IDs, and patch descriptors */ 701 status = usb_interface_id(c, f); 702 if (status < 0) 703 goto fail; 704 ac_interface_desc.bInterfaceNumber = status; 705 706 status = usb_interface_id(c, f); 707 if (status < 0) 708 goto fail; 709 as_interface_alt_0_desc.bInterfaceNumber = status; 710 as_interface_alt_1_desc.bInterfaceNumber = status; 711 712 status = -ENODEV; 713 714 /* allocate instance-specific endpoints */ 715 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc); 716 if (!ep) 717 goto fail; 718 audio->out_ep = ep; 719 audio->out_ep->desc = &as_out_ep_desc; 720 721 status = -ENOMEM; 722 723 /* copy descriptors, and track endpoint copies */ 724 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL, 725 NULL); 726 if (status) 727 goto fail; 728 return 0; 729 730 fail: 731 gaudio_cleanup(&audio->card); 732 return status; 733 } 734 735 /*-------------------------------------------------------------------------*/ 736 737 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value) 738 { 739 con->data[cmd] = value; 740 741 return 0; 742 } 743 744 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd) 745 { 746 return con->data[cmd]; 747 } 748 749 /* Todo: add more control selecotor dynamically */ 750 static int control_selector_init(struct f_audio *audio) 751 { 752 INIT_LIST_HEAD(&audio->cs); 753 list_add(&feature_unit.list, &audio->cs); 754 755 INIT_LIST_HEAD(&feature_unit.control); 756 list_add(&mute_control.list, &feature_unit.control); 757 list_add(&volume_control.list, &feature_unit.control); 758 759 volume_control.data[UAC__CUR] = 0xffc0; 760 volume_control.data[UAC__MIN] = 0xe3a0; 761 volume_control.data[UAC__MAX] = 0xfff0; 762 volume_control.data[UAC__RES] = 0x0030; 763 764 return 0; 765 } 766 767 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item) 768 { 769 return container_of(to_config_group(item), struct f_uac1_opts, 770 func_inst.group); 771 } 772 773 static void f_uac1_attr_release(struct config_item *item) 774 { 775 struct f_uac1_opts *opts = to_f_uac1_opts(item); 776 777 usb_put_function_instance(&opts->func_inst); 778 } 779 780 static struct configfs_item_operations f_uac1_item_ops = { 781 .release = f_uac1_attr_release, 782 }; 783 784 #define UAC1_INT_ATTRIBUTE(name) \ 785 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 786 char *page) \ 787 { \ 788 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 789 int result; \ 790 \ 791 mutex_lock(&opts->lock); \ 792 result = sprintf(page, "%u\n", opts->name); \ 793 mutex_unlock(&opts->lock); \ 794 \ 795 return result; \ 796 } \ 797 \ 798 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 799 const char *page, size_t len) \ 800 { \ 801 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 802 int ret; \ 803 u32 num; \ 804 \ 805 mutex_lock(&opts->lock); \ 806 if (opts->refcnt) { \ 807 ret = -EBUSY; \ 808 goto end; \ 809 } \ 810 \ 811 ret = kstrtou32(page, 0, &num); \ 812 if (ret) \ 813 goto end; \ 814 \ 815 opts->name = num; \ 816 ret = len; \ 817 \ 818 end: \ 819 mutex_unlock(&opts->lock); \ 820 return ret; \ 821 } \ 822 \ 823 CONFIGFS_ATTR(f_uac1_opts_, name) 824 825 UAC1_INT_ATTRIBUTE(req_buf_size); 826 UAC1_INT_ATTRIBUTE(req_count); 827 UAC1_INT_ATTRIBUTE(audio_buf_size); 828 829 #define UAC1_STR_ATTRIBUTE(name) \ 830 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \ 831 char *page) \ 832 { \ 833 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 834 int result; \ 835 \ 836 mutex_lock(&opts->lock); \ 837 result = sprintf(page, "%s\n", opts->name); \ 838 mutex_unlock(&opts->lock); \ 839 \ 840 return result; \ 841 } \ 842 \ 843 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \ 844 const char *page, size_t len) \ 845 { \ 846 struct f_uac1_opts *opts = to_f_uac1_opts(item); \ 847 int ret = -EBUSY; \ 848 char *tmp; \ 849 \ 850 mutex_lock(&opts->lock); \ 851 if (opts->refcnt) \ 852 goto end; \ 853 \ 854 tmp = kstrndup(page, len, GFP_KERNEL); \ 855 if (tmp) { \ 856 ret = -ENOMEM; \ 857 goto end; \ 858 } \ 859 if (opts->name##_alloc) \ 860 kfree(opts->name); \ 861 opts->name##_alloc = true; \ 862 opts->name = tmp; \ 863 ret = len; \ 864 \ 865 end: \ 866 mutex_unlock(&opts->lock); \ 867 return ret; \ 868 } \ 869 \ 870 CONFIGFS_ATTR(f_uac1_opts_, name) 871 872 UAC1_STR_ATTRIBUTE(fn_play); 873 UAC1_STR_ATTRIBUTE(fn_cap); 874 UAC1_STR_ATTRIBUTE(fn_cntl); 875 876 static struct configfs_attribute *f_uac1_attrs[] = { 877 &f_uac1_opts_attr_req_buf_size, 878 &f_uac1_opts_attr_req_count, 879 &f_uac1_opts_attr_audio_buf_size, 880 &f_uac1_opts_attr_fn_play, 881 &f_uac1_opts_attr_fn_cap, 882 &f_uac1_opts_attr_fn_cntl, 883 NULL, 884 }; 885 886 static struct config_item_type f_uac1_func_type = { 887 .ct_item_ops = &f_uac1_item_ops, 888 .ct_attrs = f_uac1_attrs, 889 .ct_owner = THIS_MODULE, 890 }; 891 892 static void f_audio_free_inst(struct usb_function_instance *f) 893 { 894 struct f_uac1_opts *opts; 895 896 opts = container_of(f, struct f_uac1_opts, func_inst); 897 if (opts->fn_play_alloc) 898 kfree(opts->fn_play); 899 if (opts->fn_cap_alloc) 900 kfree(opts->fn_cap); 901 if (opts->fn_cntl_alloc) 902 kfree(opts->fn_cntl); 903 kfree(opts); 904 } 905 906 static struct usb_function_instance *f_audio_alloc_inst(void) 907 { 908 struct f_uac1_opts *opts; 909 910 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 911 if (!opts) 912 return ERR_PTR(-ENOMEM); 913 914 mutex_init(&opts->lock); 915 opts->func_inst.free_func_inst = f_audio_free_inst; 916 917 config_group_init_type_name(&opts->func_inst.group, "", 918 &f_uac1_func_type); 919 920 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; 921 opts->req_count = UAC1_REQ_COUNT; 922 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE; 923 opts->fn_play = FILE_PCM_PLAYBACK; 924 opts->fn_cap = FILE_PCM_CAPTURE; 925 opts->fn_cntl = FILE_CONTROL; 926 return &opts->func_inst; 927 } 928 929 static void f_audio_free(struct usb_function *f) 930 { 931 struct f_audio *audio = func_to_audio(f); 932 struct f_uac1_opts *opts; 933 934 gaudio_cleanup(&audio->card); 935 opts = container_of(f->fi, struct f_uac1_opts, func_inst); 936 kfree(audio); 937 mutex_lock(&opts->lock); 938 --opts->refcnt; 939 mutex_unlock(&opts->lock); 940 } 941 942 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f) 943 { 944 usb_free_all_descriptors(f); 945 } 946 947 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi) 948 { 949 struct f_audio *audio; 950 struct f_uac1_opts *opts; 951 952 /* allocate and initialize one new instance */ 953 audio = kzalloc(sizeof(*audio), GFP_KERNEL); 954 if (!audio) 955 return ERR_PTR(-ENOMEM); 956 957 audio->card.func.name = "g_audio"; 958 959 opts = container_of(fi, struct f_uac1_opts, func_inst); 960 mutex_lock(&opts->lock); 961 ++opts->refcnt; 962 mutex_unlock(&opts->lock); 963 INIT_LIST_HEAD(&audio->play_queue); 964 spin_lock_init(&audio->lock); 965 966 audio->card.func.bind = f_audio_bind; 967 audio->card.func.unbind = f_audio_unbind; 968 audio->card.func.set_alt = f_audio_set_alt; 969 audio->card.func.setup = f_audio_setup; 970 audio->card.func.disable = f_audio_disable; 971 audio->card.func.free_func = f_audio_free; 972 973 control_selector_init(audio); 974 975 INIT_WORK(&audio->playback_work, f_audio_playback_work); 976 977 return &audio->card.func; 978 } 979 980 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc); 981 MODULE_LICENSE("GPL"); 982 MODULE_AUTHOR("Bryan Wu"); 983