1 /* 2 * f_uac2.c -- USB Audio Class 2.0 Function 3 * 4 * Copyright (C) 2011 5 * Yadwinder Singh (yadi.brar01@gmail.com) 6 * Jaswinder Singh (jaswinder.singh@linaro.org) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/usb/audio.h> 15 #include <linux/usb/audio-v2.h> 16 #include <linux/platform_device.h> 17 #include <linux/module.h> 18 19 #include <sound/core.h> 20 #include <sound/pcm.h> 21 #include <sound/pcm_params.h> 22 23 #include "u_uac2.h" 24 25 /* Keep everyone on toes */ 26 #define USB_XFERS 2 27 28 /* 29 * The driver implements a simple UAC_2 topology. 30 * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture 31 * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN 32 * Capture and Playback sampling rates are independently 33 * controlled by two clock sources : 34 * CLK_5 := c_srate, and CLK_6 := p_srate 35 */ 36 #define USB_OUT_IT_ID 1 37 #define IO_IN_IT_ID 2 38 #define IO_OUT_OT_ID 3 39 #define USB_IN_OT_ID 4 40 #define USB_OUT_CLK_ID 5 41 #define USB_IN_CLK_ID 6 42 43 #define CONTROL_ABSENT 0 44 #define CONTROL_RDONLY 1 45 #define CONTROL_RDWR 3 46 47 #define CLK_FREQ_CTRL 0 48 #define CLK_VLD_CTRL 2 49 50 #define COPY_CTRL 0 51 #define CONN_CTRL 2 52 #define OVRLD_CTRL 4 53 #define CLSTR_CTRL 6 54 #define UNFLW_CTRL 8 55 #define OVFLW_CTRL 10 56 57 static const char *uac2_name = "snd_uac2"; 58 59 struct uac2_req { 60 struct uac2_rtd_params *pp; /* parent param */ 61 struct usb_request *req; 62 }; 63 64 struct uac2_rtd_params { 65 struct snd_uac2_chip *uac2; /* parent chip */ 66 bool ep_enabled; /* if the ep is enabled */ 67 /* Size of the ring buffer */ 68 size_t dma_bytes; 69 unsigned char *dma_area; 70 71 struct snd_pcm_substream *ss; 72 73 /* Ring buffer */ 74 ssize_t hw_ptr; 75 76 void *rbuf; 77 78 size_t period_size; 79 80 unsigned max_psize; 81 struct uac2_req ureq[USB_XFERS]; 82 83 spinlock_t lock; 84 }; 85 86 struct snd_uac2_chip { 87 struct platform_device pdev; 88 struct platform_driver pdrv; 89 90 struct uac2_rtd_params p_prm; 91 struct uac2_rtd_params c_prm; 92 93 struct snd_card *card; 94 struct snd_pcm *pcm; 95 96 /* timekeeping for the playback endpoint */ 97 unsigned int p_interval; 98 unsigned int p_residue; 99 100 /* pre-calculated values for playback iso completion */ 101 unsigned int p_pktsize; 102 unsigned int p_pktsize_residue; 103 unsigned int p_framesize; 104 }; 105 106 #define BUFF_SIZE_MAX (PAGE_SIZE * 16) 107 #define PRD_SIZE_MAX PAGE_SIZE 108 #define MIN_PERIODS 4 109 110 static struct snd_pcm_hardware uac2_pcm_hardware = { 111 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER 112 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID 113 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 114 .rates = SNDRV_PCM_RATE_CONTINUOUS, 115 .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX, 116 .buffer_bytes_max = BUFF_SIZE_MAX, 117 .period_bytes_max = PRD_SIZE_MAX, 118 .periods_min = MIN_PERIODS, 119 }; 120 121 struct audio_dev { 122 u8 ac_intf, ac_alt; 123 u8 as_out_intf, as_out_alt; 124 u8 as_in_intf, as_in_alt; 125 126 struct usb_ep *in_ep, *out_ep; 127 struct usb_function func; 128 129 /* The ALSA Sound Card it represents on the USB-Client side */ 130 struct snd_uac2_chip uac2; 131 }; 132 133 static inline 134 struct audio_dev *func_to_agdev(struct usb_function *f) 135 { 136 return container_of(f, struct audio_dev, func); 137 } 138 139 static inline 140 struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u) 141 { 142 return container_of(u, struct audio_dev, uac2); 143 } 144 145 static inline 146 struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p) 147 { 148 return container_of(p, struct snd_uac2_chip, pdev); 149 } 150 151 static inline 152 struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev) 153 { 154 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst); 155 } 156 157 static inline 158 uint num_channels(uint chanmask) 159 { 160 uint num = 0; 161 162 while (chanmask) { 163 num += (chanmask & 1); 164 chanmask >>= 1; 165 } 166 167 return num; 168 } 169 170 static void 171 agdev_iso_complete(struct usb_ep *ep, struct usb_request *req) 172 { 173 unsigned pending; 174 unsigned long flags; 175 unsigned int hw_ptr; 176 bool update_alsa = false; 177 int status = req->status; 178 struct uac2_req *ur = req->context; 179 struct snd_pcm_substream *substream; 180 struct uac2_rtd_params *prm = ur->pp; 181 struct snd_uac2_chip *uac2 = prm->uac2; 182 183 /* i/f shutting down */ 184 if (!prm->ep_enabled || req->status == -ESHUTDOWN) 185 return; 186 187 /* 188 * We can't really do much about bad xfers. 189 * Afterall, the ISOCH xfers could fail legitimately. 190 */ 191 if (status) 192 pr_debug("%s: iso_complete status(%d) %d/%d\n", 193 __func__, status, req->actual, req->length); 194 195 substream = prm->ss; 196 197 /* Do nothing if ALSA isn't active */ 198 if (!substream) 199 goto exit; 200 201 spin_lock_irqsave(&prm->lock, flags); 202 203 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 204 /* 205 * For each IN packet, take the quotient of the current data 206 * rate and the endpoint's interval as the base packet size. 207 * If there is a residue from this division, add it to the 208 * residue accumulator. 209 */ 210 req->length = uac2->p_pktsize; 211 uac2->p_residue += uac2->p_pktsize_residue; 212 213 /* 214 * Whenever there are more bytes in the accumulator than we 215 * need to add one more sample frame, increase this packet's 216 * size and decrease the accumulator. 217 */ 218 if (uac2->p_residue / uac2->p_interval >= uac2->p_framesize) { 219 req->length += uac2->p_framesize; 220 uac2->p_residue -= uac2->p_framesize * 221 uac2->p_interval; 222 } 223 224 req->actual = req->length; 225 } 226 227 pending = prm->hw_ptr % prm->period_size; 228 pending += req->actual; 229 if (pending >= prm->period_size) 230 update_alsa = true; 231 232 hw_ptr = prm->hw_ptr; 233 prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes; 234 235 spin_unlock_irqrestore(&prm->lock, flags); 236 237 /* Pack USB load in ALSA ring buffer */ 238 pending = prm->dma_bytes - hw_ptr; 239 240 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 241 if (unlikely(pending < req->actual)) { 242 memcpy(req->buf, prm->dma_area + hw_ptr, pending); 243 memcpy(req->buf + pending, prm->dma_area, 244 req->actual - pending); 245 } else { 246 memcpy(req->buf, prm->dma_area + hw_ptr, req->actual); 247 } 248 } else { 249 if (unlikely(pending < req->actual)) { 250 memcpy(prm->dma_area + hw_ptr, req->buf, pending); 251 memcpy(prm->dma_area, req->buf + pending, 252 req->actual - pending); 253 } else { 254 memcpy(prm->dma_area + hw_ptr, req->buf, req->actual); 255 } 256 } 257 258 exit: 259 if (usb_ep_queue(ep, req, GFP_ATOMIC)) 260 dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__); 261 262 if (update_alsa) 263 snd_pcm_period_elapsed(substream); 264 265 return; 266 } 267 268 static int 269 uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd) 270 { 271 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 272 struct uac2_rtd_params *prm; 273 unsigned long flags; 274 int err = 0; 275 276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 277 prm = &uac2->p_prm; 278 else 279 prm = &uac2->c_prm; 280 281 spin_lock_irqsave(&prm->lock, flags); 282 283 /* Reset */ 284 prm->hw_ptr = 0; 285 286 switch (cmd) { 287 case SNDRV_PCM_TRIGGER_START: 288 case SNDRV_PCM_TRIGGER_RESUME: 289 prm->ss = substream; 290 break; 291 case SNDRV_PCM_TRIGGER_STOP: 292 case SNDRV_PCM_TRIGGER_SUSPEND: 293 prm->ss = NULL; 294 break; 295 default: 296 err = -EINVAL; 297 } 298 299 spin_unlock_irqrestore(&prm->lock, flags); 300 301 /* Clear buffer after Play stops */ 302 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss) 303 memset(prm->rbuf, 0, prm->max_psize * USB_XFERS); 304 305 return err; 306 } 307 308 static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream) 309 { 310 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 311 struct uac2_rtd_params *prm; 312 313 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 314 prm = &uac2->p_prm; 315 else 316 prm = &uac2->c_prm; 317 318 return bytes_to_frames(substream->runtime, prm->hw_ptr); 319 } 320 321 static int uac2_pcm_hw_params(struct snd_pcm_substream *substream, 322 struct snd_pcm_hw_params *hw_params) 323 { 324 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 325 struct uac2_rtd_params *prm; 326 int err; 327 328 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 329 prm = &uac2->p_prm; 330 else 331 prm = &uac2->c_prm; 332 333 err = snd_pcm_lib_malloc_pages(substream, 334 params_buffer_bytes(hw_params)); 335 if (err >= 0) { 336 prm->dma_bytes = substream->runtime->dma_bytes; 337 prm->dma_area = substream->runtime->dma_area; 338 prm->period_size = params_period_bytes(hw_params); 339 } 340 341 return err; 342 } 343 344 static int uac2_pcm_hw_free(struct snd_pcm_substream *substream) 345 { 346 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 347 struct uac2_rtd_params *prm; 348 349 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 350 prm = &uac2->p_prm; 351 else 352 prm = &uac2->c_prm; 353 354 prm->dma_area = NULL; 355 prm->dma_bytes = 0; 356 prm->period_size = 0; 357 358 return snd_pcm_lib_free_pages(substream); 359 } 360 361 static int uac2_pcm_open(struct snd_pcm_substream *substream) 362 { 363 struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream); 364 struct snd_pcm_runtime *runtime = substream->runtime; 365 struct audio_dev *audio_dev; 366 struct f_uac2_opts *opts; 367 int p_ssize, c_ssize; 368 int p_srate, c_srate; 369 int p_chmask, c_chmask; 370 371 audio_dev = uac2_to_agdev(uac2); 372 opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst); 373 p_ssize = opts->p_ssize; 374 c_ssize = opts->c_ssize; 375 p_srate = opts->p_srate; 376 c_srate = opts->c_srate; 377 p_chmask = opts->p_chmask; 378 c_chmask = opts->c_chmask; 379 uac2->p_residue = 0; 380 381 runtime->hw = uac2_pcm_hardware; 382 383 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 384 spin_lock_init(&uac2->p_prm.lock); 385 runtime->hw.rate_min = p_srate; 386 switch (p_ssize) { 387 case 3: 388 runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE; 389 break; 390 case 4: 391 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE; 392 break; 393 default: 394 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; 395 break; 396 } 397 runtime->hw.channels_min = num_channels(p_chmask); 398 runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize 399 / runtime->hw.periods_min; 400 } else { 401 spin_lock_init(&uac2->c_prm.lock); 402 runtime->hw.rate_min = c_srate; 403 switch (c_ssize) { 404 case 3: 405 runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE; 406 break; 407 case 4: 408 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE; 409 break; 410 default: 411 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; 412 break; 413 } 414 runtime->hw.channels_min = num_channels(c_chmask); 415 runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize 416 / runtime->hw.periods_min; 417 } 418 419 runtime->hw.rate_max = runtime->hw.rate_min; 420 runtime->hw.channels_max = runtime->hw.channels_min; 421 422 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 423 424 return 0; 425 } 426 427 /* ALSA cries without these function pointers */ 428 static int uac2_pcm_null(struct snd_pcm_substream *substream) 429 { 430 return 0; 431 } 432 433 static struct snd_pcm_ops uac2_pcm_ops = { 434 .open = uac2_pcm_open, 435 .close = uac2_pcm_null, 436 .ioctl = snd_pcm_lib_ioctl, 437 .hw_params = uac2_pcm_hw_params, 438 .hw_free = uac2_pcm_hw_free, 439 .trigger = uac2_pcm_trigger, 440 .pointer = uac2_pcm_pointer, 441 .prepare = uac2_pcm_null, 442 }; 443 444 static int snd_uac2_probe(struct platform_device *pdev) 445 { 446 struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev); 447 struct snd_card *card; 448 struct snd_pcm *pcm; 449 struct audio_dev *audio_dev; 450 struct f_uac2_opts *opts; 451 int err; 452 int p_chmask, c_chmask; 453 454 audio_dev = uac2_to_agdev(uac2); 455 opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst); 456 p_chmask = opts->p_chmask; 457 c_chmask = opts->c_chmask; 458 459 /* Choose any slot, with no id */ 460 err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card); 461 if (err < 0) 462 return err; 463 464 uac2->card = card; 465 466 /* 467 * Create first PCM device 468 * Create a substream only for non-zero channel streams 469 */ 470 err = snd_pcm_new(uac2->card, "UAC2 PCM", 0, 471 p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm); 472 if (err < 0) 473 goto snd_fail; 474 475 strcpy(pcm->name, "UAC2 PCM"); 476 pcm->private_data = uac2; 477 478 uac2->pcm = pcm; 479 480 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops); 481 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops); 482 483 strcpy(card->driver, "UAC2_Gadget"); 484 strcpy(card->shortname, "UAC2_Gadget"); 485 sprintf(card->longname, "UAC2_Gadget %i", pdev->id); 486 487 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, 488 snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX); 489 490 err = snd_card_register(card); 491 if (!err) { 492 platform_set_drvdata(pdev, card); 493 return 0; 494 } 495 496 snd_fail: 497 snd_card_free(card); 498 499 uac2->pcm = NULL; 500 uac2->card = NULL; 501 502 return err; 503 } 504 505 static int snd_uac2_remove(struct platform_device *pdev) 506 { 507 struct snd_card *card = platform_get_drvdata(pdev); 508 509 if (card) 510 return snd_card_free(card); 511 512 return 0; 513 } 514 515 static void snd_uac2_release(struct device *dev) 516 { 517 dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); 518 } 519 520 static int alsa_uac2_init(struct audio_dev *agdev) 521 { 522 struct snd_uac2_chip *uac2 = &agdev->uac2; 523 int err; 524 525 uac2->pdrv.probe = snd_uac2_probe; 526 uac2->pdrv.remove = snd_uac2_remove; 527 uac2->pdrv.driver.name = uac2_name; 528 529 uac2->pdev.id = 0; 530 uac2->pdev.name = uac2_name; 531 uac2->pdev.dev.release = snd_uac2_release; 532 533 /* Register snd_uac2 driver */ 534 err = platform_driver_register(&uac2->pdrv); 535 if (err) 536 return err; 537 538 /* Register snd_uac2 device */ 539 err = platform_device_register(&uac2->pdev); 540 if (err) 541 platform_driver_unregister(&uac2->pdrv); 542 543 return err; 544 } 545 546 static void alsa_uac2_exit(struct audio_dev *agdev) 547 { 548 struct snd_uac2_chip *uac2 = &agdev->uac2; 549 550 platform_driver_unregister(&uac2->pdrv); 551 platform_device_unregister(&uac2->pdev); 552 } 553 554 555 /* --------- USB Function Interface ------------- */ 556 557 enum { 558 STR_ASSOC, 559 STR_IF_CTRL, 560 STR_CLKSRC_IN, 561 STR_CLKSRC_OUT, 562 STR_USB_IT, 563 STR_IO_IT, 564 STR_USB_OT, 565 STR_IO_OT, 566 STR_AS_OUT_ALT0, 567 STR_AS_OUT_ALT1, 568 STR_AS_IN_ALT0, 569 STR_AS_IN_ALT1, 570 }; 571 572 static char clksrc_in[8]; 573 static char clksrc_out[8]; 574 575 static struct usb_string strings_fn[] = { 576 [STR_ASSOC].s = "Source/Sink", 577 [STR_IF_CTRL].s = "Topology Control", 578 [STR_CLKSRC_IN].s = clksrc_in, 579 [STR_CLKSRC_OUT].s = clksrc_out, 580 [STR_USB_IT].s = "USBH Out", 581 [STR_IO_IT].s = "USBD Out", 582 [STR_USB_OT].s = "USBH In", 583 [STR_IO_OT].s = "USBD In", 584 [STR_AS_OUT_ALT0].s = "Playback Inactive", 585 [STR_AS_OUT_ALT1].s = "Playback Active", 586 [STR_AS_IN_ALT0].s = "Capture Inactive", 587 [STR_AS_IN_ALT1].s = "Capture Active", 588 { }, 589 }; 590 591 static struct usb_gadget_strings str_fn = { 592 .language = 0x0409, /* en-us */ 593 .strings = strings_fn, 594 }; 595 596 static struct usb_gadget_strings *fn_strings[] = { 597 &str_fn, 598 NULL, 599 }; 600 601 static struct usb_interface_assoc_descriptor iad_desc = { 602 .bLength = sizeof iad_desc, 603 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 604 605 .bFirstInterface = 0, 606 .bInterfaceCount = 3, 607 .bFunctionClass = USB_CLASS_AUDIO, 608 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED, 609 .bFunctionProtocol = UAC_VERSION_2, 610 }; 611 612 /* Audio Control Interface */ 613 static struct usb_interface_descriptor std_ac_if_desc = { 614 .bLength = sizeof std_ac_if_desc, 615 .bDescriptorType = USB_DT_INTERFACE, 616 617 .bAlternateSetting = 0, 618 .bNumEndpoints = 0, 619 .bInterfaceClass = USB_CLASS_AUDIO, 620 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 621 .bInterfaceProtocol = UAC_VERSION_2, 622 }; 623 624 /* Clock source for IN traffic */ 625 static struct uac_clock_source_descriptor in_clk_src_desc = { 626 .bLength = sizeof in_clk_src_desc, 627 .bDescriptorType = USB_DT_CS_INTERFACE, 628 629 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 630 .bClockID = USB_IN_CLK_ID, 631 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 632 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 633 .bAssocTerminal = 0, 634 }; 635 636 /* Clock source for OUT traffic */ 637 static struct uac_clock_source_descriptor out_clk_src_desc = { 638 .bLength = sizeof out_clk_src_desc, 639 .bDescriptorType = USB_DT_CS_INTERFACE, 640 641 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 642 .bClockID = USB_OUT_CLK_ID, 643 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 644 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 645 .bAssocTerminal = 0, 646 }; 647 648 /* Input Terminal for USB_OUT */ 649 static struct uac2_input_terminal_descriptor usb_out_it_desc = { 650 .bLength = sizeof usb_out_it_desc, 651 .bDescriptorType = USB_DT_CS_INTERFACE, 652 653 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 654 .bTerminalID = USB_OUT_IT_ID, 655 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 656 .bAssocTerminal = 0, 657 .bCSourceID = USB_OUT_CLK_ID, 658 .iChannelNames = 0, 659 .bmControls = (CONTROL_RDWR << COPY_CTRL), 660 }; 661 662 /* Input Terminal for I/O-In */ 663 static struct uac2_input_terminal_descriptor io_in_it_desc = { 664 .bLength = sizeof io_in_it_desc, 665 .bDescriptorType = USB_DT_CS_INTERFACE, 666 667 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 668 .bTerminalID = IO_IN_IT_ID, 669 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED), 670 .bAssocTerminal = 0, 671 .bCSourceID = USB_IN_CLK_ID, 672 .iChannelNames = 0, 673 .bmControls = (CONTROL_RDWR << COPY_CTRL), 674 }; 675 676 /* Ouput Terminal for USB_IN */ 677 static struct uac2_output_terminal_descriptor usb_in_ot_desc = { 678 .bLength = sizeof usb_in_ot_desc, 679 .bDescriptorType = USB_DT_CS_INTERFACE, 680 681 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 682 .bTerminalID = USB_IN_OT_ID, 683 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 684 .bAssocTerminal = 0, 685 .bSourceID = IO_IN_IT_ID, 686 .bCSourceID = USB_IN_CLK_ID, 687 .bmControls = (CONTROL_RDWR << COPY_CTRL), 688 }; 689 690 /* Ouput Terminal for I/O-Out */ 691 static struct uac2_output_terminal_descriptor io_out_ot_desc = { 692 .bLength = sizeof io_out_ot_desc, 693 .bDescriptorType = USB_DT_CS_INTERFACE, 694 695 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 696 .bTerminalID = IO_OUT_OT_ID, 697 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED), 698 .bAssocTerminal = 0, 699 .bSourceID = USB_OUT_IT_ID, 700 .bCSourceID = USB_OUT_CLK_ID, 701 .bmControls = (CONTROL_RDWR << COPY_CTRL), 702 }; 703 704 static struct uac2_ac_header_descriptor ac_hdr_desc = { 705 .bLength = sizeof ac_hdr_desc, 706 .bDescriptorType = USB_DT_CS_INTERFACE, 707 708 .bDescriptorSubtype = UAC_MS_HEADER, 709 .bcdADC = cpu_to_le16(0x200), 710 .bCategory = UAC2_FUNCTION_IO_BOX, 711 .wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc 712 + sizeof usb_out_it_desc + sizeof io_in_it_desc 713 + sizeof usb_in_ot_desc + sizeof io_out_ot_desc, 714 .bmControls = 0, 715 }; 716 717 /* Audio Streaming OUT Interface - Alt0 */ 718 static struct usb_interface_descriptor std_as_out_if0_desc = { 719 .bLength = sizeof std_as_out_if0_desc, 720 .bDescriptorType = USB_DT_INTERFACE, 721 722 .bAlternateSetting = 0, 723 .bNumEndpoints = 0, 724 .bInterfaceClass = USB_CLASS_AUDIO, 725 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 726 .bInterfaceProtocol = UAC_VERSION_2, 727 }; 728 729 /* Audio Streaming OUT Interface - Alt1 */ 730 static struct usb_interface_descriptor std_as_out_if1_desc = { 731 .bLength = sizeof std_as_out_if1_desc, 732 .bDescriptorType = USB_DT_INTERFACE, 733 734 .bAlternateSetting = 1, 735 .bNumEndpoints = 1, 736 .bInterfaceClass = USB_CLASS_AUDIO, 737 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 738 .bInterfaceProtocol = UAC_VERSION_2, 739 }; 740 741 /* Audio Stream OUT Intface Desc */ 742 static struct uac2_as_header_descriptor as_out_hdr_desc = { 743 .bLength = sizeof as_out_hdr_desc, 744 .bDescriptorType = USB_DT_CS_INTERFACE, 745 746 .bDescriptorSubtype = UAC_AS_GENERAL, 747 .bTerminalLink = USB_OUT_IT_ID, 748 .bmControls = 0, 749 .bFormatType = UAC_FORMAT_TYPE_I, 750 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 751 .iChannelNames = 0, 752 }; 753 754 /* Audio USB_OUT Format */ 755 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = { 756 .bLength = sizeof as_out_fmt1_desc, 757 .bDescriptorType = USB_DT_CS_INTERFACE, 758 .bDescriptorSubtype = UAC_FORMAT_TYPE, 759 .bFormatType = UAC_FORMAT_TYPE_I, 760 }; 761 762 /* STD AS ISO OUT Endpoint */ 763 static struct usb_endpoint_descriptor fs_epout_desc = { 764 .bLength = USB_DT_ENDPOINT_SIZE, 765 .bDescriptorType = USB_DT_ENDPOINT, 766 767 .bEndpointAddress = USB_DIR_OUT, 768 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 769 .wMaxPacketSize = cpu_to_le16(1023), 770 .bInterval = 1, 771 }; 772 773 static struct usb_endpoint_descriptor hs_epout_desc = { 774 .bLength = USB_DT_ENDPOINT_SIZE, 775 .bDescriptorType = USB_DT_ENDPOINT, 776 777 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 778 .wMaxPacketSize = cpu_to_le16(1024), 779 .bInterval = 4, 780 }; 781 782 /* CS AS ISO OUT Endpoint */ 783 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = { 784 .bLength = sizeof as_iso_out_desc, 785 .bDescriptorType = USB_DT_CS_ENDPOINT, 786 787 .bDescriptorSubtype = UAC_EP_GENERAL, 788 .bmAttributes = 0, 789 .bmControls = 0, 790 .bLockDelayUnits = 0, 791 .wLockDelay = 0, 792 }; 793 794 /* Audio Streaming IN Interface - Alt0 */ 795 static struct usb_interface_descriptor std_as_in_if0_desc = { 796 .bLength = sizeof std_as_in_if0_desc, 797 .bDescriptorType = USB_DT_INTERFACE, 798 799 .bAlternateSetting = 0, 800 .bNumEndpoints = 0, 801 .bInterfaceClass = USB_CLASS_AUDIO, 802 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 803 .bInterfaceProtocol = UAC_VERSION_2, 804 }; 805 806 /* Audio Streaming IN Interface - Alt1 */ 807 static struct usb_interface_descriptor std_as_in_if1_desc = { 808 .bLength = sizeof std_as_in_if1_desc, 809 .bDescriptorType = USB_DT_INTERFACE, 810 811 .bAlternateSetting = 1, 812 .bNumEndpoints = 1, 813 .bInterfaceClass = USB_CLASS_AUDIO, 814 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 815 .bInterfaceProtocol = UAC_VERSION_2, 816 }; 817 818 /* Audio Stream IN Intface Desc */ 819 static struct uac2_as_header_descriptor as_in_hdr_desc = { 820 .bLength = sizeof as_in_hdr_desc, 821 .bDescriptorType = USB_DT_CS_INTERFACE, 822 823 .bDescriptorSubtype = UAC_AS_GENERAL, 824 .bTerminalLink = USB_IN_OT_ID, 825 .bmControls = 0, 826 .bFormatType = UAC_FORMAT_TYPE_I, 827 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 828 .iChannelNames = 0, 829 }; 830 831 /* Audio USB_IN Format */ 832 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = { 833 .bLength = sizeof as_in_fmt1_desc, 834 .bDescriptorType = USB_DT_CS_INTERFACE, 835 .bDescriptorSubtype = UAC_FORMAT_TYPE, 836 .bFormatType = UAC_FORMAT_TYPE_I, 837 }; 838 839 /* STD AS ISO IN Endpoint */ 840 static struct usb_endpoint_descriptor fs_epin_desc = { 841 .bLength = USB_DT_ENDPOINT_SIZE, 842 .bDescriptorType = USB_DT_ENDPOINT, 843 844 .bEndpointAddress = USB_DIR_IN, 845 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 846 .wMaxPacketSize = cpu_to_le16(1023), 847 .bInterval = 1, 848 }; 849 850 static struct usb_endpoint_descriptor hs_epin_desc = { 851 .bLength = USB_DT_ENDPOINT_SIZE, 852 .bDescriptorType = USB_DT_ENDPOINT, 853 854 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 855 .wMaxPacketSize = cpu_to_le16(1024), 856 .bInterval = 4, 857 }; 858 859 /* CS AS ISO IN Endpoint */ 860 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = { 861 .bLength = sizeof as_iso_in_desc, 862 .bDescriptorType = USB_DT_CS_ENDPOINT, 863 864 .bDescriptorSubtype = UAC_EP_GENERAL, 865 .bmAttributes = 0, 866 .bmControls = 0, 867 .bLockDelayUnits = 0, 868 .wLockDelay = 0, 869 }; 870 871 static struct usb_descriptor_header *fs_audio_desc[] = { 872 (struct usb_descriptor_header *)&iad_desc, 873 (struct usb_descriptor_header *)&std_ac_if_desc, 874 875 (struct usb_descriptor_header *)&ac_hdr_desc, 876 (struct usb_descriptor_header *)&in_clk_src_desc, 877 (struct usb_descriptor_header *)&out_clk_src_desc, 878 (struct usb_descriptor_header *)&usb_out_it_desc, 879 (struct usb_descriptor_header *)&io_in_it_desc, 880 (struct usb_descriptor_header *)&usb_in_ot_desc, 881 (struct usb_descriptor_header *)&io_out_ot_desc, 882 883 (struct usb_descriptor_header *)&std_as_out_if0_desc, 884 (struct usb_descriptor_header *)&std_as_out_if1_desc, 885 886 (struct usb_descriptor_header *)&as_out_hdr_desc, 887 (struct usb_descriptor_header *)&as_out_fmt1_desc, 888 (struct usb_descriptor_header *)&fs_epout_desc, 889 (struct usb_descriptor_header *)&as_iso_out_desc, 890 891 (struct usb_descriptor_header *)&std_as_in_if0_desc, 892 (struct usb_descriptor_header *)&std_as_in_if1_desc, 893 894 (struct usb_descriptor_header *)&as_in_hdr_desc, 895 (struct usb_descriptor_header *)&as_in_fmt1_desc, 896 (struct usb_descriptor_header *)&fs_epin_desc, 897 (struct usb_descriptor_header *)&as_iso_in_desc, 898 NULL, 899 }; 900 901 static struct usb_descriptor_header *hs_audio_desc[] = { 902 (struct usb_descriptor_header *)&iad_desc, 903 (struct usb_descriptor_header *)&std_ac_if_desc, 904 905 (struct usb_descriptor_header *)&ac_hdr_desc, 906 (struct usb_descriptor_header *)&in_clk_src_desc, 907 (struct usb_descriptor_header *)&out_clk_src_desc, 908 (struct usb_descriptor_header *)&usb_out_it_desc, 909 (struct usb_descriptor_header *)&io_in_it_desc, 910 (struct usb_descriptor_header *)&usb_in_ot_desc, 911 (struct usb_descriptor_header *)&io_out_ot_desc, 912 913 (struct usb_descriptor_header *)&std_as_out_if0_desc, 914 (struct usb_descriptor_header *)&std_as_out_if1_desc, 915 916 (struct usb_descriptor_header *)&as_out_hdr_desc, 917 (struct usb_descriptor_header *)&as_out_fmt1_desc, 918 (struct usb_descriptor_header *)&hs_epout_desc, 919 (struct usb_descriptor_header *)&as_iso_out_desc, 920 921 (struct usb_descriptor_header *)&std_as_in_if0_desc, 922 (struct usb_descriptor_header *)&std_as_in_if1_desc, 923 924 (struct usb_descriptor_header *)&as_in_hdr_desc, 925 (struct usb_descriptor_header *)&as_in_fmt1_desc, 926 (struct usb_descriptor_header *)&hs_epin_desc, 927 (struct usb_descriptor_header *)&as_iso_in_desc, 928 NULL, 929 }; 930 931 struct cntrl_cur_lay3 { 932 __u32 dCUR; 933 }; 934 935 struct cntrl_range_lay3 { 936 __u16 wNumSubRanges; 937 __u32 dMIN; 938 __u32 dMAX; 939 __u32 dRES; 940 } __packed; 941 942 static inline void 943 free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep) 944 { 945 struct snd_uac2_chip *uac2 = prm->uac2; 946 int i; 947 948 if (!prm->ep_enabled) 949 return; 950 951 prm->ep_enabled = false; 952 953 for (i = 0; i < USB_XFERS; i++) { 954 if (prm->ureq[i].req) { 955 usb_ep_dequeue(ep, prm->ureq[i].req); 956 usb_ep_free_request(ep, prm->ureq[i].req); 957 prm->ureq[i].req = NULL; 958 } 959 } 960 961 if (usb_ep_disable(ep)) 962 dev_err(&uac2->pdev.dev, 963 "%s:%d Error!\n", __func__, __LINE__); 964 } 965 966 static void set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, 967 struct usb_endpoint_descriptor *ep_desc, 968 unsigned int factor, bool is_playback) 969 { 970 int chmask, srate, ssize; 971 u16 max_packet_size; 972 973 if (is_playback) { 974 chmask = uac2_opts->p_chmask; 975 srate = uac2_opts->p_srate; 976 ssize = uac2_opts->p_ssize; 977 } else { 978 chmask = uac2_opts->c_chmask; 979 srate = uac2_opts->c_srate; 980 ssize = uac2_opts->c_ssize; 981 } 982 983 max_packet_size = num_channels(chmask) * ssize * 984 DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1))); 985 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_packet_size, 986 le16_to_cpu(ep_desc->wMaxPacketSize))); 987 } 988 989 static int 990 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) 991 { 992 struct audio_dev *agdev = func_to_agdev(fn); 993 struct snd_uac2_chip *uac2 = &agdev->uac2; 994 struct usb_composite_dev *cdev = cfg->cdev; 995 struct usb_gadget *gadget = cdev->gadget; 996 struct device *dev = &uac2->pdev.dev; 997 struct uac2_rtd_params *prm; 998 struct f_uac2_opts *uac2_opts; 999 struct usb_string *us; 1000 int ret; 1001 1002 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst); 1003 1004 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn)); 1005 if (IS_ERR(us)) 1006 return PTR_ERR(us); 1007 iad_desc.iFunction = us[STR_ASSOC].id; 1008 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id; 1009 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id; 1010 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id; 1011 usb_out_it_desc.iTerminal = us[STR_USB_IT].id; 1012 io_in_it_desc.iTerminal = us[STR_IO_IT].id; 1013 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id; 1014 io_out_ot_desc.iTerminal = us[STR_IO_OT].id; 1015 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id; 1016 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id; 1017 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id; 1018 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id; 1019 1020 1021 /* Initialize the configurable parameters */ 1022 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1023 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1024 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1025 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1026 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1027 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1028 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1029 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1030 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize; 1031 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8; 1032 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize; 1033 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8; 1034 1035 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate); 1036 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate); 1037 1038 ret = usb_interface_id(cfg, fn); 1039 if (ret < 0) { 1040 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1041 return ret; 1042 } 1043 std_ac_if_desc.bInterfaceNumber = ret; 1044 agdev->ac_intf = ret; 1045 agdev->ac_alt = 0; 1046 1047 ret = usb_interface_id(cfg, fn); 1048 if (ret < 0) { 1049 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1050 return ret; 1051 } 1052 std_as_out_if0_desc.bInterfaceNumber = ret; 1053 std_as_out_if1_desc.bInterfaceNumber = ret; 1054 agdev->as_out_intf = ret; 1055 agdev->as_out_alt = 0; 1056 1057 ret = usb_interface_id(cfg, fn); 1058 if (ret < 0) { 1059 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1060 return ret; 1061 } 1062 std_as_in_if0_desc.bInterfaceNumber = ret; 1063 std_as_in_if1_desc.bInterfaceNumber = ret; 1064 agdev->as_in_intf = ret; 1065 agdev->as_in_alt = 0; 1066 1067 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc); 1068 if (!agdev->out_ep) { 1069 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1070 goto err; 1071 } 1072 1073 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc); 1074 if (!agdev->in_ep) { 1075 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1076 goto err; 1077 } 1078 1079 uac2->p_prm.uac2 = uac2; 1080 uac2->c_prm.uac2 = uac2; 1081 1082 /* Calculate wMaxPacketSize according to audio bandwidth */ 1083 set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true); 1084 set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false); 1085 set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true); 1086 set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false); 1087 1088 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress; 1089 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress; 1090 1091 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL, 1092 NULL); 1093 if (ret) 1094 goto err; 1095 1096 prm = &agdev->uac2.c_prm; 1097 prm->max_psize = hs_epout_desc.wMaxPacketSize; 1098 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL); 1099 if (!prm->rbuf) { 1100 prm->max_psize = 0; 1101 goto err_free_descs; 1102 } 1103 1104 prm = &agdev->uac2.p_prm; 1105 prm->max_psize = hs_epin_desc.wMaxPacketSize; 1106 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL); 1107 if (!prm->rbuf) { 1108 prm->max_psize = 0; 1109 goto err_free_descs; 1110 } 1111 1112 ret = alsa_uac2_init(agdev); 1113 if (ret) 1114 goto err_free_descs; 1115 return 0; 1116 1117 err_free_descs: 1118 usb_free_all_descriptors(fn); 1119 err: 1120 kfree(agdev->uac2.p_prm.rbuf); 1121 kfree(agdev->uac2.c_prm.rbuf); 1122 return -EINVAL; 1123 } 1124 1125 static int 1126 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) 1127 { 1128 struct usb_composite_dev *cdev = fn->config->cdev; 1129 struct audio_dev *agdev = func_to_agdev(fn); 1130 struct snd_uac2_chip *uac2 = &agdev->uac2; 1131 struct usb_gadget *gadget = cdev->gadget; 1132 struct device *dev = &uac2->pdev.dev; 1133 struct usb_request *req; 1134 struct usb_ep *ep; 1135 struct uac2_rtd_params *prm; 1136 int req_len, i; 1137 1138 /* No i/f has more than 2 alt settings */ 1139 if (alt > 1) { 1140 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1141 return -EINVAL; 1142 } 1143 1144 if (intf == agdev->ac_intf) { 1145 /* Control I/f has only 1 AltSetting - 0 */ 1146 if (alt) { 1147 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1148 return -EINVAL; 1149 } 1150 return 0; 1151 } 1152 1153 if (intf == agdev->as_out_intf) { 1154 ep = agdev->out_ep; 1155 prm = &uac2->c_prm; 1156 config_ep_by_speed(gadget, fn, ep); 1157 agdev->as_out_alt = alt; 1158 req_len = prm->max_psize; 1159 } else if (intf == agdev->as_in_intf) { 1160 struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev); 1161 unsigned int factor, rate; 1162 struct usb_endpoint_descriptor *ep_desc; 1163 1164 ep = agdev->in_ep; 1165 prm = &uac2->p_prm; 1166 config_ep_by_speed(gadget, fn, ep); 1167 agdev->as_in_alt = alt; 1168 1169 /* pre-calculate the playback endpoint's interval */ 1170 if (gadget->speed == USB_SPEED_FULL) { 1171 ep_desc = &fs_epin_desc; 1172 factor = 1000; 1173 } else { 1174 ep_desc = &hs_epin_desc; 1175 factor = 8000; 1176 } 1177 1178 /* pre-compute some values for iso_complete() */ 1179 uac2->p_framesize = opts->p_ssize * 1180 num_channels(opts->p_chmask); 1181 rate = opts->p_srate * uac2->p_framesize; 1182 uac2->p_interval = factor / (1 << (ep_desc->bInterval - 1)); 1183 uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval, 1184 prm->max_psize); 1185 1186 if (uac2->p_pktsize < prm->max_psize) 1187 uac2->p_pktsize_residue = rate % uac2->p_interval; 1188 else 1189 uac2->p_pktsize_residue = 0; 1190 1191 req_len = uac2->p_pktsize; 1192 uac2->p_residue = 0; 1193 } else { 1194 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1195 return -EINVAL; 1196 } 1197 1198 if (alt == 0) { 1199 free_ep(prm, ep); 1200 return 0; 1201 } 1202 1203 prm->ep_enabled = true; 1204 usb_ep_enable(ep); 1205 1206 for (i = 0; i < USB_XFERS; i++) { 1207 if (!prm->ureq[i].req) { 1208 req = usb_ep_alloc_request(ep, GFP_ATOMIC); 1209 if (req == NULL) 1210 return -ENOMEM; 1211 1212 prm->ureq[i].req = req; 1213 prm->ureq[i].pp = prm; 1214 1215 req->zero = 0; 1216 req->context = &prm->ureq[i]; 1217 req->length = req_len; 1218 req->complete = agdev_iso_complete; 1219 req->buf = prm->rbuf + i * prm->max_psize; 1220 } 1221 1222 if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC)) 1223 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1224 } 1225 1226 return 0; 1227 } 1228 1229 static int 1230 afunc_get_alt(struct usb_function *fn, unsigned intf) 1231 { 1232 struct audio_dev *agdev = func_to_agdev(fn); 1233 struct snd_uac2_chip *uac2 = &agdev->uac2; 1234 1235 if (intf == agdev->ac_intf) 1236 return agdev->ac_alt; 1237 else if (intf == agdev->as_out_intf) 1238 return agdev->as_out_alt; 1239 else if (intf == agdev->as_in_intf) 1240 return agdev->as_in_alt; 1241 else 1242 dev_err(&uac2->pdev.dev, 1243 "%s:%d Invalid Interface %d!\n", 1244 __func__, __LINE__, intf); 1245 1246 return -EINVAL; 1247 } 1248 1249 static void 1250 afunc_disable(struct usb_function *fn) 1251 { 1252 struct audio_dev *agdev = func_to_agdev(fn); 1253 struct snd_uac2_chip *uac2 = &agdev->uac2; 1254 1255 free_ep(&uac2->p_prm, agdev->in_ep); 1256 agdev->as_in_alt = 0; 1257 1258 free_ep(&uac2->c_prm, agdev->out_ep); 1259 agdev->as_out_alt = 0; 1260 } 1261 1262 static int 1263 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1264 { 1265 struct usb_request *req = fn->config->cdev->req; 1266 struct audio_dev *agdev = func_to_agdev(fn); 1267 struct snd_uac2_chip *uac2 = &agdev->uac2; 1268 struct f_uac2_opts *opts; 1269 u16 w_length = le16_to_cpu(cr->wLength); 1270 u16 w_index = le16_to_cpu(cr->wIndex); 1271 u16 w_value = le16_to_cpu(cr->wValue); 1272 u8 entity_id = (w_index >> 8) & 0xff; 1273 u8 control_selector = w_value >> 8; 1274 int value = -EOPNOTSUPP; 1275 int p_srate, c_srate; 1276 1277 opts = agdev_to_uac2_opts(agdev); 1278 p_srate = opts->p_srate; 1279 c_srate = opts->c_srate; 1280 1281 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1282 struct cntrl_cur_lay3 c; 1283 memset(&c, 0, sizeof(struct cntrl_cur_lay3)); 1284 1285 if (entity_id == USB_IN_CLK_ID) 1286 c.dCUR = p_srate; 1287 else if (entity_id == USB_OUT_CLK_ID) 1288 c.dCUR = c_srate; 1289 1290 value = min_t(unsigned, w_length, sizeof c); 1291 memcpy(req->buf, &c, value); 1292 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) { 1293 *(u8 *)req->buf = 1; 1294 value = min_t(unsigned, w_length, 1); 1295 } else { 1296 dev_err(&uac2->pdev.dev, 1297 "%s:%d control_selector=%d TODO!\n", 1298 __func__, __LINE__, control_selector); 1299 } 1300 1301 return value; 1302 } 1303 1304 static int 1305 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1306 { 1307 struct usb_request *req = fn->config->cdev->req; 1308 struct audio_dev *agdev = func_to_agdev(fn); 1309 struct snd_uac2_chip *uac2 = &agdev->uac2; 1310 struct f_uac2_opts *opts; 1311 u16 w_length = le16_to_cpu(cr->wLength); 1312 u16 w_index = le16_to_cpu(cr->wIndex); 1313 u16 w_value = le16_to_cpu(cr->wValue); 1314 u8 entity_id = (w_index >> 8) & 0xff; 1315 u8 control_selector = w_value >> 8; 1316 struct cntrl_range_lay3 r; 1317 int value = -EOPNOTSUPP; 1318 int p_srate, c_srate; 1319 1320 opts = agdev_to_uac2_opts(agdev); 1321 p_srate = opts->p_srate; 1322 c_srate = opts->c_srate; 1323 1324 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1325 if (entity_id == USB_IN_CLK_ID) 1326 r.dMIN = p_srate; 1327 else if (entity_id == USB_OUT_CLK_ID) 1328 r.dMIN = c_srate; 1329 else 1330 return -EOPNOTSUPP; 1331 1332 r.dMAX = r.dMIN; 1333 r.dRES = 0; 1334 r.wNumSubRanges = 1; 1335 1336 value = min_t(unsigned, w_length, sizeof r); 1337 memcpy(req->buf, &r, value); 1338 } else { 1339 dev_err(&uac2->pdev.dev, 1340 "%s:%d control_selector=%d TODO!\n", 1341 __func__, __LINE__, control_selector); 1342 } 1343 1344 return value; 1345 } 1346 1347 static int 1348 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1349 { 1350 if (cr->bRequest == UAC2_CS_CUR) 1351 return in_rq_cur(fn, cr); 1352 else if (cr->bRequest == UAC2_CS_RANGE) 1353 return in_rq_range(fn, cr); 1354 else 1355 return -EOPNOTSUPP; 1356 } 1357 1358 static int 1359 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1360 { 1361 u16 w_length = le16_to_cpu(cr->wLength); 1362 u16 w_value = le16_to_cpu(cr->wValue); 1363 u8 control_selector = w_value >> 8; 1364 1365 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) 1366 return w_length; 1367 1368 return -EOPNOTSUPP; 1369 } 1370 1371 static int 1372 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1373 { 1374 struct audio_dev *agdev = func_to_agdev(fn); 1375 struct snd_uac2_chip *uac2 = &agdev->uac2; 1376 u16 w_index = le16_to_cpu(cr->wIndex); 1377 u8 intf = w_index & 0xff; 1378 1379 if (intf != agdev->ac_intf) { 1380 dev_err(&uac2->pdev.dev, 1381 "%s:%d Error!\n", __func__, __LINE__); 1382 return -EOPNOTSUPP; 1383 } 1384 1385 if (cr->bRequestType & USB_DIR_IN) 1386 return ac_rq_in(fn, cr); 1387 else if (cr->bRequest == UAC2_CS_CUR) 1388 return out_rq_cur(fn, cr); 1389 1390 return -EOPNOTSUPP; 1391 } 1392 1393 static int 1394 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1395 { 1396 struct usb_composite_dev *cdev = fn->config->cdev; 1397 struct audio_dev *agdev = func_to_agdev(fn); 1398 struct snd_uac2_chip *uac2 = &agdev->uac2; 1399 struct usb_request *req = cdev->req; 1400 u16 w_length = le16_to_cpu(cr->wLength); 1401 int value = -EOPNOTSUPP; 1402 1403 /* Only Class specific requests are supposed to reach here */ 1404 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) 1405 return -EOPNOTSUPP; 1406 1407 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE) 1408 value = setup_rq_inf(fn, cr); 1409 else 1410 dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__); 1411 1412 if (value >= 0) { 1413 req->length = value; 1414 req->zero = value < w_length; 1415 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 1416 if (value < 0) { 1417 dev_err(&uac2->pdev.dev, 1418 "%s:%d Error!\n", __func__, __LINE__); 1419 req->status = 0; 1420 } 1421 } 1422 1423 return value; 1424 } 1425 1426 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item) 1427 { 1428 return container_of(to_config_group(item), struct f_uac2_opts, 1429 func_inst.group); 1430 } 1431 1432 static void f_uac2_attr_release(struct config_item *item) 1433 { 1434 struct f_uac2_opts *opts = to_f_uac2_opts(item); 1435 1436 usb_put_function_instance(&opts->func_inst); 1437 } 1438 1439 static struct configfs_item_operations f_uac2_item_ops = { 1440 .release = f_uac2_attr_release, 1441 }; 1442 1443 #define UAC2_ATTRIBUTE(name) \ 1444 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \ 1445 char *page) \ 1446 { \ 1447 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1448 int result; \ 1449 \ 1450 mutex_lock(&opts->lock); \ 1451 result = sprintf(page, "%u\n", opts->name); \ 1452 mutex_unlock(&opts->lock); \ 1453 \ 1454 return result; \ 1455 } \ 1456 \ 1457 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \ 1458 const char *page, size_t len) \ 1459 { \ 1460 struct f_uac2_opts *opts = to_f_uac2_opts(item); \ 1461 int ret; \ 1462 u32 num; \ 1463 \ 1464 mutex_lock(&opts->lock); \ 1465 if (opts->refcnt) { \ 1466 ret = -EBUSY; \ 1467 goto end; \ 1468 } \ 1469 \ 1470 ret = kstrtou32(page, 0, &num); \ 1471 if (ret) \ 1472 goto end; \ 1473 \ 1474 opts->name = num; \ 1475 ret = len; \ 1476 \ 1477 end: \ 1478 mutex_unlock(&opts->lock); \ 1479 return ret; \ 1480 } \ 1481 \ 1482 CONFIGFS_ATTR(f_uac2_opts_, name) 1483 1484 UAC2_ATTRIBUTE(p_chmask); 1485 UAC2_ATTRIBUTE(p_srate); 1486 UAC2_ATTRIBUTE(p_ssize); 1487 UAC2_ATTRIBUTE(c_chmask); 1488 UAC2_ATTRIBUTE(c_srate); 1489 UAC2_ATTRIBUTE(c_ssize); 1490 1491 static struct configfs_attribute *f_uac2_attrs[] = { 1492 &f_uac2_opts_attr_p_chmask, 1493 &f_uac2_opts_attr_p_srate, 1494 &f_uac2_opts_attr_p_ssize, 1495 &f_uac2_opts_attr_c_chmask, 1496 &f_uac2_opts_attr_c_srate, 1497 &f_uac2_opts_attr_c_ssize, 1498 NULL, 1499 }; 1500 1501 static struct config_item_type f_uac2_func_type = { 1502 .ct_item_ops = &f_uac2_item_ops, 1503 .ct_attrs = f_uac2_attrs, 1504 .ct_owner = THIS_MODULE, 1505 }; 1506 1507 static void afunc_free_inst(struct usb_function_instance *f) 1508 { 1509 struct f_uac2_opts *opts; 1510 1511 opts = container_of(f, struct f_uac2_opts, func_inst); 1512 kfree(opts); 1513 } 1514 1515 static struct usb_function_instance *afunc_alloc_inst(void) 1516 { 1517 struct f_uac2_opts *opts; 1518 1519 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1520 if (!opts) 1521 return ERR_PTR(-ENOMEM); 1522 1523 mutex_init(&opts->lock); 1524 opts->func_inst.free_func_inst = afunc_free_inst; 1525 1526 config_group_init_type_name(&opts->func_inst.group, "", 1527 &f_uac2_func_type); 1528 1529 opts->p_chmask = UAC2_DEF_PCHMASK; 1530 opts->p_srate = UAC2_DEF_PSRATE; 1531 opts->p_ssize = UAC2_DEF_PSSIZE; 1532 opts->c_chmask = UAC2_DEF_CCHMASK; 1533 opts->c_srate = UAC2_DEF_CSRATE; 1534 opts->c_ssize = UAC2_DEF_CSSIZE; 1535 return &opts->func_inst; 1536 } 1537 1538 static void afunc_free(struct usb_function *f) 1539 { 1540 struct audio_dev *agdev; 1541 struct f_uac2_opts *opts; 1542 1543 agdev = func_to_agdev(f); 1544 opts = container_of(f->fi, struct f_uac2_opts, func_inst); 1545 kfree(agdev); 1546 mutex_lock(&opts->lock); 1547 --opts->refcnt; 1548 mutex_unlock(&opts->lock); 1549 } 1550 1551 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f) 1552 { 1553 struct audio_dev *agdev = func_to_agdev(f); 1554 struct uac2_rtd_params *prm; 1555 1556 alsa_uac2_exit(agdev); 1557 1558 prm = &agdev->uac2.p_prm; 1559 kfree(prm->rbuf); 1560 1561 prm = &agdev->uac2.c_prm; 1562 kfree(prm->rbuf); 1563 usb_free_all_descriptors(f); 1564 } 1565 1566 static struct usb_function *afunc_alloc(struct usb_function_instance *fi) 1567 { 1568 struct audio_dev *agdev; 1569 struct f_uac2_opts *opts; 1570 1571 agdev = kzalloc(sizeof(*agdev), GFP_KERNEL); 1572 if (agdev == NULL) 1573 return ERR_PTR(-ENOMEM); 1574 1575 opts = container_of(fi, struct f_uac2_opts, func_inst); 1576 mutex_lock(&opts->lock); 1577 ++opts->refcnt; 1578 mutex_unlock(&opts->lock); 1579 1580 agdev->func.name = "uac2_func"; 1581 agdev->func.bind = afunc_bind; 1582 agdev->func.unbind = afunc_unbind; 1583 agdev->func.set_alt = afunc_set_alt; 1584 agdev->func.get_alt = afunc_get_alt; 1585 agdev->func.disable = afunc_disable; 1586 agdev->func.setup = afunc_setup; 1587 agdev->func.free_func = afunc_free; 1588 1589 return &agdev->func; 1590 } 1591 1592 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc); 1593 MODULE_LICENSE("GPL"); 1594 MODULE_AUTHOR("Yadwinder Singh"); 1595 MODULE_AUTHOR("Jaswinder Singh"); 1596