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 57const char *uac2_name = "snd_uac2"; 58 59struct uac2_req { 60 struct uac2_rtd_params *pp; /* parent param */ 61 struct usb_request *req; 62}; 63 64struct 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 86struct 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 110static 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 121struct 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 133static inline 134struct audio_dev *func_to_agdev(struct usb_function *f) 135{ 136 return container_of(f, struct audio_dev, func); 137} 138 139static inline 140struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u) 141{ 142 return container_of(u, struct audio_dev, uac2); 143} 144 145static inline 146struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p) 147{ 148 return container_of(p, struct snd_uac2_chip, pdev); 149} 150 151static inline 152struct 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 157static inline 158uint 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 170static void 171agdev_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 258exit: 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 268static int 269uac2_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 308static 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 321static 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 344static 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 361static 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 */ 428static int uac2_pcm_null(struct snd_pcm_substream *substream) 429{ 430 return 0; 431} 432 433static 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 444static 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 496snd_fail: 497 snd_card_free(card); 498 499 uac2->pcm = NULL; 500 uac2->card = NULL; 501 502 return err; 503} 504 505static 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 515static void snd_uac2_release(struct device *dev) 516{ 517 dev_dbg(dev, "releasing '%s'\n", dev_name(dev)); 518} 519 520static 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 546static 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 557enum { 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 572static char clksrc_in[8]; 573static char clksrc_out[8]; 574 575static 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 591static struct usb_gadget_strings str_fn = { 592 .language = 0x0409, /* en-us */ 593 .strings = strings_fn, 594}; 595 596static struct usb_gadget_strings *fn_strings[] = { 597 &str_fn, 598 NULL, 599}; 600 601static struct usb_qualifier_descriptor devqual_desc = { 602 .bLength = sizeof devqual_desc, 603 .bDescriptorType = USB_DT_DEVICE_QUALIFIER, 604 605 .bcdUSB = cpu_to_le16(0x200), 606 .bDeviceClass = USB_CLASS_MISC, 607 .bDeviceSubClass = 0x02, 608 .bDeviceProtocol = 0x01, 609 .bNumConfigurations = 1, 610 .bRESERVED = 0, 611}; 612 613static struct usb_interface_assoc_descriptor iad_desc = { 614 .bLength = sizeof iad_desc, 615 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION, 616 617 .bFirstInterface = 0, 618 .bInterfaceCount = 3, 619 .bFunctionClass = USB_CLASS_AUDIO, 620 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED, 621 .bFunctionProtocol = UAC_VERSION_2, 622}; 623 624/* Audio Control Interface */ 625static struct usb_interface_descriptor std_ac_if_desc = { 626 .bLength = sizeof std_ac_if_desc, 627 .bDescriptorType = USB_DT_INTERFACE, 628 629 .bAlternateSetting = 0, 630 .bNumEndpoints = 0, 631 .bInterfaceClass = USB_CLASS_AUDIO, 632 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, 633 .bInterfaceProtocol = UAC_VERSION_2, 634}; 635 636/* Clock source for IN traffic */ 637struct uac_clock_source_descriptor in_clk_src_desc = { 638 .bLength = sizeof in_clk_src_desc, 639 .bDescriptorType = USB_DT_CS_INTERFACE, 640 641 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 642 .bClockID = USB_IN_CLK_ID, 643 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 644 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 645 .bAssocTerminal = 0, 646}; 647 648/* Clock source for OUT traffic */ 649struct uac_clock_source_descriptor out_clk_src_desc = { 650 .bLength = sizeof out_clk_src_desc, 651 .bDescriptorType = USB_DT_CS_INTERFACE, 652 653 .bDescriptorSubtype = UAC2_CLOCK_SOURCE, 654 .bClockID = USB_OUT_CLK_ID, 655 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED, 656 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL), 657 .bAssocTerminal = 0, 658}; 659 660/* Input Terminal for USB_OUT */ 661struct uac2_input_terminal_descriptor usb_out_it_desc = { 662 .bLength = sizeof usb_out_it_desc, 663 .bDescriptorType = USB_DT_CS_INTERFACE, 664 665 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 666 .bTerminalID = USB_OUT_IT_ID, 667 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 668 .bAssocTerminal = 0, 669 .bCSourceID = USB_OUT_CLK_ID, 670 .iChannelNames = 0, 671 .bmControls = (CONTROL_RDWR << COPY_CTRL), 672}; 673 674/* Input Terminal for I/O-In */ 675struct uac2_input_terminal_descriptor io_in_it_desc = { 676 .bLength = sizeof io_in_it_desc, 677 .bDescriptorType = USB_DT_CS_INTERFACE, 678 679 .bDescriptorSubtype = UAC_INPUT_TERMINAL, 680 .bTerminalID = IO_IN_IT_ID, 681 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED), 682 .bAssocTerminal = 0, 683 .bCSourceID = USB_IN_CLK_ID, 684 .iChannelNames = 0, 685 .bmControls = (CONTROL_RDWR << COPY_CTRL), 686}; 687 688/* Ouput Terminal for USB_IN */ 689struct uac2_output_terminal_descriptor usb_in_ot_desc = { 690 .bLength = sizeof usb_in_ot_desc, 691 .bDescriptorType = USB_DT_CS_INTERFACE, 692 693 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 694 .bTerminalID = USB_IN_OT_ID, 695 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING), 696 .bAssocTerminal = 0, 697 .bSourceID = IO_IN_IT_ID, 698 .bCSourceID = USB_IN_CLK_ID, 699 .bmControls = (CONTROL_RDWR << COPY_CTRL), 700}; 701 702/* Ouput Terminal for I/O-Out */ 703struct uac2_output_terminal_descriptor io_out_ot_desc = { 704 .bLength = sizeof io_out_ot_desc, 705 .bDescriptorType = USB_DT_CS_INTERFACE, 706 707 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL, 708 .bTerminalID = IO_OUT_OT_ID, 709 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED), 710 .bAssocTerminal = 0, 711 .bSourceID = USB_OUT_IT_ID, 712 .bCSourceID = USB_OUT_CLK_ID, 713 .bmControls = (CONTROL_RDWR << COPY_CTRL), 714}; 715 716struct uac2_ac_header_descriptor ac_hdr_desc = { 717 .bLength = sizeof ac_hdr_desc, 718 .bDescriptorType = USB_DT_CS_INTERFACE, 719 720 .bDescriptorSubtype = UAC_MS_HEADER, 721 .bcdADC = cpu_to_le16(0x200), 722 .bCategory = UAC2_FUNCTION_IO_BOX, 723 .wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc 724 + sizeof usb_out_it_desc + sizeof io_in_it_desc 725 + sizeof usb_in_ot_desc + sizeof io_out_ot_desc, 726 .bmControls = 0, 727}; 728 729/* Audio Streaming OUT Interface - Alt0 */ 730static struct usb_interface_descriptor std_as_out_if0_desc = { 731 .bLength = sizeof std_as_out_if0_desc, 732 .bDescriptorType = USB_DT_INTERFACE, 733 734 .bAlternateSetting = 0, 735 .bNumEndpoints = 0, 736 .bInterfaceClass = USB_CLASS_AUDIO, 737 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 738 .bInterfaceProtocol = UAC_VERSION_2, 739}; 740 741/* Audio Streaming OUT Interface - Alt1 */ 742static struct usb_interface_descriptor std_as_out_if1_desc = { 743 .bLength = sizeof std_as_out_if1_desc, 744 .bDescriptorType = USB_DT_INTERFACE, 745 746 .bAlternateSetting = 1, 747 .bNumEndpoints = 1, 748 .bInterfaceClass = USB_CLASS_AUDIO, 749 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 750 .bInterfaceProtocol = UAC_VERSION_2, 751}; 752 753/* Audio Stream OUT Intface Desc */ 754struct uac2_as_header_descriptor as_out_hdr_desc = { 755 .bLength = sizeof as_out_hdr_desc, 756 .bDescriptorType = USB_DT_CS_INTERFACE, 757 758 .bDescriptorSubtype = UAC_AS_GENERAL, 759 .bTerminalLink = USB_OUT_IT_ID, 760 .bmControls = 0, 761 .bFormatType = UAC_FORMAT_TYPE_I, 762 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 763 .iChannelNames = 0, 764}; 765 766/* Audio USB_OUT Format */ 767struct uac2_format_type_i_descriptor as_out_fmt1_desc = { 768 .bLength = sizeof as_out_fmt1_desc, 769 .bDescriptorType = USB_DT_CS_INTERFACE, 770 .bDescriptorSubtype = UAC_FORMAT_TYPE, 771 .bFormatType = UAC_FORMAT_TYPE_I, 772}; 773 774/* STD AS ISO OUT Endpoint */ 775struct usb_endpoint_descriptor fs_epout_desc = { 776 .bLength = USB_DT_ENDPOINT_SIZE, 777 .bDescriptorType = USB_DT_ENDPOINT, 778 779 .bEndpointAddress = USB_DIR_OUT, 780 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 781 .wMaxPacketSize = cpu_to_le16(1023), 782 .bInterval = 1, 783}; 784 785struct usb_endpoint_descriptor hs_epout_desc = { 786 .bLength = USB_DT_ENDPOINT_SIZE, 787 .bDescriptorType = USB_DT_ENDPOINT, 788 789 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 790 .wMaxPacketSize = cpu_to_le16(1024), 791 .bInterval = 4, 792}; 793 794/* CS AS ISO OUT Endpoint */ 795static struct uac2_iso_endpoint_descriptor as_iso_out_desc = { 796 .bLength = sizeof as_iso_out_desc, 797 .bDescriptorType = USB_DT_CS_ENDPOINT, 798 799 .bDescriptorSubtype = UAC_EP_GENERAL, 800 .bmAttributes = 0, 801 .bmControls = 0, 802 .bLockDelayUnits = 0, 803 .wLockDelay = 0, 804}; 805 806/* Audio Streaming IN Interface - Alt0 */ 807static struct usb_interface_descriptor std_as_in_if0_desc = { 808 .bLength = sizeof std_as_in_if0_desc, 809 .bDescriptorType = USB_DT_INTERFACE, 810 811 .bAlternateSetting = 0, 812 .bNumEndpoints = 0, 813 .bInterfaceClass = USB_CLASS_AUDIO, 814 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 815 .bInterfaceProtocol = UAC_VERSION_2, 816}; 817 818/* Audio Streaming IN Interface - Alt1 */ 819static struct usb_interface_descriptor std_as_in_if1_desc = { 820 .bLength = sizeof std_as_in_if1_desc, 821 .bDescriptorType = USB_DT_INTERFACE, 822 823 .bAlternateSetting = 1, 824 .bNumEndpoints = 1, 825 .bInterfaceClass = USB_CLASS_AUDIO, 826 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING, 827 .bInterfaceProtocol = UAC_VERSION_2, 828}; 829 830/* Audio Stream IN Intface Desc */ 831struct uac2_as_header_descriptor as_in_hdr_desc = { 832 .bLength = sizeof as_in_hdr_desc, 833 .bDescriptorType = USB_DT_CS_INTERFACE, 834 835 .bDescriptorSubtype = UAC_AS_GENERAL, 836 .bTerminalLink = USB_IN_OT_ID, 837 .bmControls = 0, 838 .bFormatType = UAC_FORMAT_TYPE_I, 839 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM), 840 .iChannelNames = 0, 841}; 842 843/* Audio USB_IN Format */ 844struct uac2_format_type_i_descriptor as_in_fmt1_desc = { 845 .bLength = sizeof as_in_fmt1_desc, 846 .bDescriptorType = USB_DT_CS_INTERFACE, 847 .bDescriptorSubtype = UAC_FORMAT_TYPE, 848 .bFormatType = UAC_FORMAT_TYPE_I, 849}; 850 851/* STD AS ISO IN Endpoint */ 852struct usb_endpoint_descriptor fs_epin_desc = { 853 .bLength = USB_DT_ENDPOINT_SIZE, 854 .bDescriptorType = USB_DT_ENDPOINT, 855 856 .bEndpointAddress = USB_DIR_IN, 857 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 858 .wMaxPacketSize = cpu_to_le16(1023), 859 .bInterval = 1, 860}; 861 862struct usb_endpoint_descriptor hs_epin_desc = { 863 .bLength = USB_DT_ENDPOINT_SIZE, 864 .bDescriptorType = USB_DT_ENDPOINT, 865 866 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC, 867 .wMaxPacketSize = cpu_to_le16(1024), 868 .bInterval = 4, 869}; 870 871/* CS AS ISO IN Endpoint */ 872static struct uac2_iso_endpoint_descriptor as_iso_in_desc = { 873 .bLength = sizeof as_iso_in_desc, 874 .bDescriptorType = USB_DT_CS_ENDPOINT, 875 876 .bDescriptorSubtype = UAC_EP_GENERAL, 877 .bmAttributes = 0, 878 .bmControls = 0, 879 .bLockDelayUnits = 0, 880 .wLockDelay = 0, 881}; 882 883static struct usb_descriptor_header *fs_audio_desc[] = { 884 (struct usb_descriptor_header *)&iad_desc, 885 (struct usb_descriptor_header *)&std_ac_if_desc, 886 887 (struct usb_descriptor_header *)&ac_hdr_desc, 888 (struct usb_descriptor_header *)&in_clk_src_desc, 889 (struct usb_descriptor_header *)&out_clk_src_desc, 890 (struct usb_descriptor_header *)&usb_out_it_desc, 891 (struct usb_descriptor_header *)&io_in_it_desc, 892 (struct usb_descriptor_header *)&usb_in_ot_desc, 893 (struct usb_descriptor_header *)&io_out_ot_desc, 894 895 (struct usb_descriptor_header *)&std_as_out_if0_desc, 896 (struct usb_descriptor_header *)&std_as_out_if1_desc, 897 898 (struct usb_descriptor_header *)&as_out_hdr_desc, 899 (struct usb_descriptor_header *)&as_out_fmt1_desc, 900 (struct usb_descriptor_header *)&fs_epout_desc, 901 (struct usb_descriptor_header *)&as_iso_out_desc, 902 903 (struct usb_descriptor_header *)&std_as_in_if0_desc, 904 (struct usb_descriptor_header *)&std_as_in_if1_desc, 905 906 (struct usb_descriptor_header *)&as_in_hdr_desc, 907 (struct usb_descriptor_header *)&as_in_fmt1_desc, 908 (struct usb_descriptor_header *)&fs_epin_desc, 909 (struct usb_descriptor_header *)&as_iso_in_desc, 910 NULL, 911}; 912 913static struct usb_descriptor_header *hs_audio_desc[] = { 914 (struct usb_descriptor_header *)&iad_desc, 915 (struct usb_descriptor_header *)&std_ac_if_desc, 916 917 (struct usb_descriptor_header *)&ac_hdr_desc, 918 (struct usb_descriptor_header *)&in_clk_src_desc, 919 (struct usb_descriptor_header *)&out_clk_src_desc, 920 (struct usb_descriptor_header *)&usb_out_it_desc, 921 (struct usb_descriptor_header *)&io_in_it_desc, 922 (struct usb_descriptor_header *)&usb_in_ot_desc, 923 (struct usb_descriptor_header *)&io_out_ot_desc, 924 925 (struct usb_descriptor_header *)&std_as_out_if0_desc, 926 (struct usb_descriptor_header *)&std_as_out_if1_desc, 927 928 (struct usb_descriptor_header *)&as_out_hdr_desc, 929 (struct usb_descriptor_header *)&as_out_fmt1_desc, 930 (struct usb_descriptor_header *)&hs_epout_desc, 931 (struct usb_descriptor_header *)&as_iso_out_desc, 932 933 (struct usb_descriptor_header *)&std_as_in_if0_desc, 934 (struct usb_descriptor_header *)&std_as_in_if1_desc, 935 936 (struct usb_descriptor_header *)&as_in_hdr_desc, 937 (struct usb_descriptor_header *)&as_in_fmt1_desc, 938 (struct usb_descriptor_header *)&hs_epin_desc, 939 (struct usb_descriptor_header *)&as_iso_in_desc, 940 NULL, 941}; 942 943struct cntrl_cur_lay3 { 944 __u32 dCUR; 945}; 946 947struct cntrl_range_lay3 { 948 __u16 wNumSubRanges; 949 __u32 dMIN; 950 __u32 dMAX; 951 __u32 dRES; 952} __packed; 953 954static inline void 955free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep) 956{ 957 struct snd_uac2_chip *uac2 = prm->uac2; 958 int i; 959 960 if (!prm->ep_enabled) 961 return; 962 963 prm->ep_enabled = false; 964 965 for (i = 0; i < USB_XFERS; i++) { 966 if (prm->ureq[i].req) { 967 usb_ep_dequeue(ep, prm->ureq[i].req); 968 usb_ep_free_request(ep, prm->ureq[i].req); 969 prm->ureq[i].req = NULL; 970 } 971 } 972 973 if (usb_ep_disable(ep)) 974 dev_err(&uac2->pdev.dev, 975 "%s:%d Error!\n", __func__, __LINE__); 976} 977 978static int 979afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) 980{ 981 struct audio_dev *agdev = func_to_agdev(fn); 982 struct snd_uac2_chip *uac2 = &agdev->uac2; 983 struct usb_composite_dev *cdev = cfg->cdev; 984 struct usb_gadget *gadget = cdev->gadget; 985 struct device *dev = &uac2->pdev.dev; 986 struct uac2_rtd_params *prm; 987 struct f_uac2_opts *uac2_opts; 988 struct usb_string *us; 989 int ret; 990 991 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst); 992 993 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn)); 994 if (IS_ERR(us)) 995 return PTR_ERR(us); 996 iad_desc.iFunction = us[STR_ASSOC].id; 997 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id; 998 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id; 999 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id; 1000 usb_out_it_desc.iTerminal = us[STR_USB_IT].id; 1001 io_in_it_desc.iTerminal = us[STR_IO_IT].id; 1002 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id; 1003 io_out_ot_desc.iTerminal = us[STR_IO_OT].id; 1004 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id; 1005 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id; 1006 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id; 1007 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id; 1008 1009 1010 /* Initialize the configurable parameters */ 1011 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1012 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1013 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1014 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1015 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask); 1016 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask); 1017 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask); 1018 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask); 1019 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize; 1020 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8; 1021 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize; 1022 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8; 1023 1024 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate); 1025 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate); 1026 1027 ret = usb_interface_id(cfg, fn); 1028 if (ret < 0) { 1029 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1030 return ret; 1031 } 1032 std_ac_if_desc.bInterfaceNumber = ret; 1033 agdev->ac_intf = ret; 1034 agdev->ac_alt = 0; 1035 1036 ret = usb_interface_id(cfg, fn); 1037 if (ret < 0) { 1038 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1039 return ret; 1040 } 1041 std_as_out_if0_desc.bInterfaceNumber = ret; 1042 std_as_out_if1_desc.bInterfaceNumber = ret; 1043 agdev->as_out_intf = ret; 1044 agdev->as_out_alt = 0; 1045 1046 ret = usb_interface_id(cfg, fn); 1047 if (ret < 0) { 1048 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1049 return ret; 1050 } 1051 std_as_in_if0_desc.bInterfaceNumber = ret; 1052 std_as_in_if1_desc.bInterfaceNumber = ret; 1053 agdev->as_in_intf = ret; 1054 agdev->as_in_alt = 0; 1055 1056 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc); 1057 if (!agdev->out_ep) { 1058 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1059 goto err; 1060 } 1061 agdev->out_ep->driver_data = agdev; 1062 1063 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc); 1064 if (!agdev->in_ep) { 1065 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1066 goto err; 1067 } 1068 agdev->in_ep->driver_data = agdev; 1069 1070 uac2->p_prm.uac2 = uac2; 1071 uac2->c_prm.uac2 = uac2; 1072 1073 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress; 1074 hs_epout_desc.wMaxPacketSize = fs_epout_desc.wMaxPacketSize; 1075 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress; 1076 hs_epin_desc.wMaxPacketSize = fs_epin_desc.wMaxPacketSize; 1077 1078 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL); 1079 if (ret) 1080 goto err; 1081 1082 prm = &agdev->uac2.c_prm; 1083 prm->max_psize = hs_epout_desc.wMaxPacketSize; 1084 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL); 1085 if (!prm->rbuf) { 1086 prm->max_psize = 0; 1087 goto err_free_descs; 1088 } 1089 1090 prm = &agdev->uac2.p_prm; 1091 prm->max_psize = hs_epin_desc.wMaxPacketSize; 1092 prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL); 1093 if (!prm->rbuf) { 1094 prm->max_psize = 0; 1095 goto err_free_descs; 1096 } 1097 1098 ret = alsa_uac2_init(agdev); 1099 if (ret) 1100 goto err_free_descs; 1101 return 0; 1102 1103err_free_descs: 1104 usb_free_all_descriptors(fn); 1105err: 1106 kfree(agdev->uac2.p_prm.rbuf); 1107 kfree(agdev->uac2.c_prm.rbuf); 1108 if (agdev->in_ep) 1109 agdev->in_ep->driver_data = NULL; 1110 if (agdev->out_ep) 1111 agdev->out_ep->driver_data = NULL; 1112 return -EINVAL; 1113} 1114 1115static int 1116afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) 1117{ 1118 struct usb_composite_dev *cdev = fn->config->cdev; 1119 struct audio_dev *agdev = func_to_agdev(fn); 1120 struct snd_uac2_chip *uac2 = &agdev->uac2; 1121 struct usb_gadget *gadget = cdev->gadget; 1122 struct device *dev = &uac2->pdev.dev; 1123 struct usb_request *req; 1124 struct usb_ep *ep; 1125 struct uac2_rtd_params *prm; 1126 int req_len, i; 1127 1128 /* No i/f has more than 2 alt settings */ 1129 if (alt > 1) { 1130 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1131 return -EINVAL; 1132 } 1133 1134 if (intf == agdev->ac_intf) { 1135 /* Control I/f has only 1 AltSetting - 0 */ 1136 if (alt) { 1137 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1138 return -EINVAL; 1139 } 1140 return 0; 1141 } 1142 1143 if (intf == agdev->as_out_intf) { 1144 ep = agdev->out_ep; 1145 prm = &uac2->c_prm; 1146 config_ep_by_speed(gadget, fn, ep); 1147 agdev->as_out_alt = alt; 1148 req_len = prm->max_psize; 1149 } else if (intf == agdev->as_in_intf) { 1150 struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev); 1151 unsigned int factor, rate; 1152 struct usb_endpoint_descriptor *ep_desc; 1153 1154 ep = agdev->in_ep; 1155 prm = &uac2->p_prm; 1156 config_ep_by_speed(gadget, fn, ep); 1157 agdev->as_in_alt = alt; 1158 1159 /* pre-calculate the playback endpoint's interval */ 1160 if (gadget->speed == USB_SPEED_FULL) { 1161 ep_desc = &fs_epin_desc; 1162 factor = 1000; 1163 } else { 1164 ep_desc = &hs_epin_desc; 1165 factor = 125; 1166 } 1167 1168 /* pre-compute some values for iso_complete() */ 1169 uac2->p_framesize = opts->p_ssize * 1170 num_channels(opts->p_chmask); 1171 rate = opts->p_srate * uac2->p_framesize; 1172 uac2->p_interval = (1 << (ep_desc->bInterval - 1)) * factor; 1173 uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval, 1174 prm->max_psize); 1175 1176 if (uac2->p_pktsize < prm->max_psize) 1177 uac2->p_pktsize_residue = rate % uac2->p_interval; 1178 else 1179 uac2->p_pktsize_residue = 0; 1180 1181 req_len = uac2->p_pktsize; 1182 uac2->p_residue = 0; 1183 } else { 1184 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1185 return -EINVAL; 1186 } 1187 1188 if (alt == 0) { 1189 free_ep(prm, ep); 1190 return 0; 1191 } 1192 1193 prm->ep_enabled = true; 1194 usb_ep_enable(ep); 1195 1196 for (i = 0; i < USB_XFERS; i++) { 1197 if (!prm->ureq[i].req) { 1198 req = usb_ep_alloc_request(ep, GFP_ATOMIC); 1199 if (req == NULL) 1200 return -ENOMEM; 1201 1202 prm->ureq[i].req = req; 1203 prm->ureq[i].pp = prm; 1204 1205 req->zero = 0; 1206 req->context = &prm->ureq[i]; 1207 req->length = req_len; 1208 req->complete = agdev_iso_complete; 1209 req->buf = prm->rbuf + i * prm->max_psize; 1210 } 1211 1212 if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC)) 1213 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__); 1214 } 1215 1216 return 0; 1217} 1218 1219static int 1220afunc_get_alt(struct usb_function *fn, unsigned intf) 1221{ 1222 struct audio_dev *agdev = func_to_agdev(fn); 1223 struct snd_uac2_chip *uac2 = &agdev->uac2; 1224 1225 if (intf == agdev->ac_intf) 1226 return agdev->ac_alt; 1227 else if (intf == agdev->as_out_intf) 1228 return agdev->as_out_alt; 1229 else if (intf == agdev->as_in_intf) 1230 return agdev->as_in_alt; 1231 else 1232 dev_err(&uac2->pdev.dev, 1233 "%s:%d Invalid Interface %d!\n", 1234 __func__, __LINE__, intf); 1235 1236 return -EINVAL; 1237} 1238 1239static void 1240afunc_disable(struct usb_function *fn) 1241{ 1242 struct audio_dev *agdev = func_to_agdev(fn); 1243 struct snd_uac2_chip *uac2 = &agdev->uac2; 1244 1245 free_ep(&uac2->p_prm, agdev->in_ep); 1246 agdev->as_in_alt = 0; 1247 1248 free_ep(&uac2->c_prm, agdev->out_ep); 1249 agdev->as_out_alt = 0; 1250} 1251 1252static int 1253in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1254{ 1255 struct usb_request *req = fn->config->cdev->req; 1256 struct audio_dev *agdev = func_to_agdev(fn); 1257 struct snd_uac2_chip *uac2 = &agdev->uac2; 1258 struct f_uac2_opts *opts; 1259 u16 w_length = le16_to_cpu(cr->wLength); 1260 u16 w_index = le16_to_cpu(cr->wIndex); 1261 u16 w_value = le16_to_cpu(cr->wValue); 1262 u8 entity_id = (w_index >> 8) & 0xff; 1263 u8 control_selector = w_value >> 8; 1264 int value = -EOPNOTSUPP; 1265 int p_srate, c_srate; 1266 1267 opts = agdev_to_uac2_opts(agdev); 1268 p_srate = opts->p_srate; 1269 c_srate = opts->c_srate; 1270 1271 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1272 struct cntrl_cur_lay3 c; 1273 1274 if (entity_id == USB_IN_CLK_ID) 1275 c.dCUR = p_srate; 1276 else if (entity_id == USB_OUT_CLK_ID) 1277 c.dCUR = c_srate; 1278 1279 value = min_t(unsigned, w_length, sizeof c); 1280 memcpy(req->buf, &c, value); 1281 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) { 1282 *(u8 *)req->buf = 1; 1283 value = min_t(unsigned, w_length, 1); 1284 } else { 1285 dev_err(&uac2->pdev.dev, 1286 "%s:%d control_selector=%d TODO!\n", 1287 __func__, __LINE__, control_selector); 1288 } 1289 1290 return value; 1291} 1292 1293static int 1294in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1295{ 1296 struct usb_request *req = fn->config->cdev->req; 1297 struct audio_dev *agdev = func_to_agdev(fn); 1298 struct snd_uac2_chip *uac2 = &agdev->uac2; 1299 struct f_uac2_opts *opts; 1300 u16 w_length = le16_to_cpu(cr->wLength); 1301 u16 w_index = le16_to_cpu(cr->wIndex); 1302 u16 w_value = le16_to_cpu(cr->wValue); 1303 u8 entity_id = (w_index >> 8) & 0xff; 1304 u8 control_selector = w_value >> 8; 1305 struct cntrl_range_lay3 r; 1306 int value = -EOPNOTSUPP; 1307 int p_srate, c_srate; 1308 1309 opts = agdev_to_uac2_opts(agdev); 1310 p_srate = opts->p_srate; 1311 c_srate = opts->c_srate; 1312 1313 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) { 1314 if (entity_id == USB_IN_CLK_ID) 1315 r.dMIN = p_srate; 1316 else if (entity_id == USB_OUT_CLK_ID) 1317 r.dMIN = c_srate; 1318 else 1319 return -EOPNOTSUPP; 1320 1321 r.dMAX = r.dMIN; 1322 r.dRES = 0; 1323 r.wNumSubRanges = 1; 1324 1325 value = min_t(unsigned, w_length, sizeof r); 1326 memcpy(req->buf, &r, value); 1327 } else { 1328 dev_err(&uac2->pdev.dev, 1329 "%s:%d control_selector=%d TODO!\n", 1330 __func__, __LINE__, control_selector); 1331 } 1332 1333 return value; 1334} 1335 1336static int 1337ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1338{ 1339 if (cr->bRequest == UAC2_CS_CUR) 1340 return in_rq_cur(fn, cr); 1341 else if (cr->bRequest == UAC2_CS_RANGE) 1342 return in_rq_range(fn, cr); 1343 else 1344 return -EOPNOTSUPP; 1345} 1346 1347static int 1348out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1349{ 1350 u16 w_length = le16_to_cpu(cr->wLength); 1351 u16 w_value = le16_to_cpu(cr->wValue); 1352 u8 control_selector = w_value >> 8; 1353 1354 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) 1355 return w_length; 1356 1357 return -EOPNOTSUPP; 1358} 1359 1360static int 1361setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1362{ 1363 struct audio_dev *agdev = func_to_agdev(fn); 1364 struct snd_uac2_chip *uac2 = &agdev->uac2; 1365 u16 w_index = le16_to_cpu(cr->wIndex); 1366 u8 intf = w_index & 0xff; 1367 1368 if (intf != agdev->ac_intf) { 1369 dev_err(&uac2->pdev.dev, 1370 "%s:%d Error!\n", __func__, __LINE__); 1371 return -EOPNOTSUPP; 1372 } 1373 1374 if (cr->bRequestType & USB_DIR_IN) 1375 return ac_rq_in(fn, cr); 1376 else if (cr->bRequest == UAC2_CS_CUR) 1377 return out_rq_cur(fn, cr); 1378 1379 return -EOPNOTSUPP; 1380} 1381 1382static int 1383afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr) 1384{ 1385 struct usb_composite_dev *cdev = fn->config->cdev; 1386 struct audio_dev *agdev = func_to_agdev(fn); 1387 struct snd_uac2_chip *uac2 = &agdev->uac2; 1388 struct usb_request *req = cdev->req; 1389 u16 w_length = le16_to_cpu(cr->wLength); 1390 int value = -EOPNOTSUPP; 1391 1392 /* Only Class specific requests are supposed to reach here */ 1393 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) 1394 return -EOPNOTSUPP; 1395 1396 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE) 1397 value = setup_rq_inf(fn, cr); 1398 else 1399 dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__); 1400 1401 if (value >= 0) { 1402 req->length = value; 1403 req->zero = value < w_length; 1404 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 1405 if (value < 0) { 1406 dev_err(&uac2->pdev.dev, 1407 "%s:%d Error!\n", __func__, __LINE__); 1408 req->status = 0; 1409 } 1410 } 1411 1412 return value; 1413} 1414 1415static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item) 1416{ 1417 return container_of(to_config_group(item), struct f_uac2_opts, 1418 func_inst.group); 1419} 1420 1421CONFIGFS_ATTR_STRUCT(f_uac2_opts); 1422CONFIGFS_ATTR_OPS(f_uac2_opts); 1423 1424static void f_uac2_attr_release(struct config_item *item) 1425{ 1426 struct f_uac2_opts *opts = to_f_uac2_opts(item); 1427 1428 usb_put_function_instance(&opts->func_inst); 1429} 1430 1431static struct configfs_item_operations f_uac2_item_ops = { 1432 .release = f_uac2_attr_release, 1433 .show_attribute = f_uac2_opts_attr_show, 1434 .store_attribute = f_uac2_opts_attr_store, 1435}; 1436 1437#define UAC2_ATTRIBUTE(name) \ 1438static ssize_t f_uac2_opts_##name##_show(struct f_uac2_opts *opts, \ 1439 char *page) \ 1440{ \ 1441 int result; \ 1442 \ 1443 mutex_lock(&opts->lock); \ 1444 result = sprintf(page, "%u\n", opts->name); \ 1445 mutex_unlock(&opts->lock); \ 1446 \ 1447 return result; \ 1448} \ 1449 \ 1450static ssize_t f_uac2_opts_##name##_store(struct f_uac2_opts *opts, \ 1451 const char *page, size_t len) \ 1452{ \ 1453 int ret; \ 1454 u32 num; \ 1455 \ 1456 mutex_lock(&opts->lock); \ 1457 if (opts->refcnt) { \ 1458 ret = -EBUSY; \ 1459 goto end; \ 1460 } \ 1461 \ 1462 ret = kstrtou32(page, 0, &num); \ 1463 if (ret) \ 1464 goto end; \ 1465 \ 1466 opts->name = num; \ 1467 ret = len; \ 1468 \ 1469end: \ 1470 mutex_unlock(&opts->lock); \ 1471 return ret; \ 1472} \ 1473 \ 1474static struct f_uac2_opts_attribute f_uac2_opts_##name = \ 1475 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \ 1476 f_uac2_opts_##name##_show, \ 1477 f_uac2_opts_##name##_store) 1478 1479UAC2_ATTRIBUTE(p_chmask); 1480UAC2_ATTRIBUTE(p_srate); 1481UAC2_ATTRIBUTE(p_ssize); 1482UAC2_ATTRIBUTE(c_chmask); 1483UAC2_ATTRIBUTE(c_srate); 1484UAC2_ATTRIBUTE(c_ssize); 1485 1486static struct configfs_attribute *f_uac2_attrs[] = { 1487 &f_uac2_opts_p_chmask.attr, 1488 &f_uac2_opts_p_srate.attr, 1489 &f_uac2_opts_p_ssize.attr, 1490 &f_uac2_opts_c_chmask.attr, 1491 &f_uac2_opts_c_srate.attr, 1492 &f_uac2_opts_c_ssize.attr, 1493 NULL, 1494}; 1495 1496static struct config_item_type f_uac2_func_type = { 1497 .ct_item_ops = &f_uac2_item_ops, 1498 .ct_attrs = f_uac2_attrs, 1499 .ct_owner = THIS_MODULE, 1500}; 1501 1502static void afunc_free_inst(struct usb_function_instance *f) 1503{ 1504 struct f_uac2_opts *opts; 1505 1506 opts = container_of(f, struct f_uac2_opts, func_inst); 1507 kfree(opts); 1508} 1509 1510static struct usb_function_instance *afunc_alloc_inst(void) 1511{ 1512 struct f_uac2_opts *opts; 1513 1514 opts = kzalloc(sizeof(*opts), GFP_KERNEL); 1515 if (!opts) 1516 return ERR_PTR(-ENOMEM); 1517 1518 mutex_init(&opts->lock); 1519 opts->func_inst.free_func_inst = afunc_free_inst; 1520 1521 config_group_init_type_name(&opts->func_inst.group, "", 1522 &f_uac2_func_type); 1523 1524 opts->p_chmask = UAC2_DEF_PCHMASK; 1525 opts->p_srate = UAC2_DEF_PSRATE; 1526 opts->p_ssize = UAC2_DEF_PSSIZE; 1527 opts->c_chmask = UAC2_DEF_CCHMASK; 1528 opts->c_srate = UAC2_DEF_CSRATE; 1529 opts->c_ssize = UAC2_DEF_CSSIZE; 1530 return &opts->func_inst; 1531} 1532 1533static void afunc_free(struct usb_function *f) 1534{ 1535 struct audio_dev *agdev; 1536 struct f_uac2_opts *opts; 1537 1538 agdev = func_to_agdev(f); 1539 opts = container_of(f->fi, struct f_uac2_opts, func_inst); 1540 kfree(agdev); 1541 mutex_lock(&opts->lock); 1542 --opts->refcnt; 1543 mutex_unlock(&opts->lock); 1544} 1545 1546static void afunc_unbind(struct usb_configuration *c, struct usb_function *f) 1547{ 1548 struct audio_dev *agdev = func_to_agdev(f); 1549 struct uac2_rtd_params *prm; 1550 1551 alsa_uac2_exit(agdev); 1552 1553 prm = &agdev->uac2.p_prm; 1554 kfree(prm->rbuf); 1555 1556 prm = &agdev->uac2.c_prm; 1557 kfree(prm->rbuf); 1558 usb_free_all_descriptors(f); 1559 1560 if (agdev->in_ep) 1561 agdev->in_ep->driver_data = NULL; 1562 if (agdev->out_ep) 1563 agdev->out_ep->driver_data = NULL; 1564} 1565 1566struct 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 1592DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc); 1593MODULE_LICENSE("GPL"); 1594MODULE_AUTHOR("Yadwinder Singh"); 1595MODULE_AUTHOR("Jaswinder Singh"); 1596