drivers/usb/gadget/f_uac2.c

   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 /* Playback(USB-IN) Default Stereo - Fl/Fr */
  24 static int p_chmask = 0x3;
  25 module_param(p_chmask, uint, S_IRUGO);
  26 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
  27
  28 /* Playback Default 48 KHz */
  29 static int p_srate = 48000;
  30 module_param(p_srate, uint, S_IRUGO);
  31 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
  32
  33 /* Playback Default 16bits/sample */
  34 static int p_ssize = 2;
  35 module_param(p_ssize, uint, S_IRUGO);
  36 MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
  37
  38 /* Capture(USB-OUT) Default Stereo - Fl/Fr */
  39 static int c_chmask = 0x3;
  40 module_param(c_chmask, uint, S_IRUGO);
  41 MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
  42
  43 /* Capture Default 64 KHz */
  44 static int c_srate = 64000;
  45 module_param(c_srate, uint, S_IRUGO);
  46 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
  47
  48 /* Capture Default 16bits/sample */
  49 static int c_ssize = 2;
  50 module_param(c_ssize, uint, S_IRUGO);
  51 MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
  52
  53 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  54
  55 #define ALT_SET(x, a)   do {(x) &= ~0xff; (x) |= (a); } while (0)
  56 #define ALT_GET(x)      ((x) & 0xff)
  57 #define INTF_SET(x, i)  do {(x) &= 0xff; (x) |= ((i) << 8); } while (0)
  58 #define INTF_GET(x)     ((x >> 8) & 0xff)
  59
  60 /* Keep everyone on toes */
  61 #define USB_XFERS       2
  62
  63 /*
  64  * The driver implements a simple UAC_2 topology.
  65  * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
  66  * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN
  67  * Capture and Playback sampling rates are independently
  68  *  controlled by two clock sources :
  69  *    CLK_5 := c_srate, and CLK_6 := p_srate
  70  */
  71 #define USB_OUT_IT_ID   1
  72 #define IO_IN_IT_ID     2
  73 #define IO_OUT_OT_ID    3
  74 #define USB_IN_OT_ID    4
  75 #define USB_OUT_CLK_ID  5
  76 #define USB_IN_CLK_ID   6
  77
  78 #define CONTROL_ABSENT  0
  79 #define CONTROL_RDONLY  1
  80 #define CONTROL_RDWR    3
  81
  82 #define CLK_FREQ_CTRL   0
  83 #define CLK_VLD_CTRL    2
  84
  85 #define COPY_CTRL       0
  86 #define CONN_CTRL       2
  87 #define OVRLD_CTRL      4
  88 #define CLSTR_CTRL      6
  89 #define UNFLW_CTRL      8
  90 #define OVFLW_CTRL      10
  91
  92 const char *uac2_name = "snd_uac2";
  93
  94 struct uac2_req {
  95         struct uac2_rtd_params *pp; /* parent param */
  96         struct usb_request *req;
  97 };
  98
  99 struct uac2_rtd_params {
 100         bool ep_enabled; /* if the ep is enabled */
 101         /* Size of the ring buffer */
 102         size_t dma_bytes;
 103         unsigned char *dma_area;
 104
 105         struct snd_pcm_substream *ss;
 106
 107         /* Ring buffer */
 108         ssize_t hw_ptr;
 109
 110         void *rbuf;
 111
 112         size_t period_size;
 113
 114         unsigned max_psize;
 115         struct uac2_req ureq[USB_XFERS];
 116
 117         spinlock_t lock;
 118 };
 119
 120 struct snd_uac2_chip {
 121         struct platform_device pdev;
 122         struct platform_driver pdrv;
 123
 124         struct uac2_rtd_params p_prm;
 125         struct uac2_rtd_params c_prm;
 126
 127         struct snd_card *card;
 128         struct snd_pcm *pcm;
 129 };
 130
 131 #define BUFF_SIZE_MAX   (PAGE_SIZE * 16)
 132 #define PRD_SIZE_MAX    PAGE_SIZE
 133 #define MIN_PERIODS     4
 134
 135 static struct snd_pcm_hardware uac2_pcm_hardware = {
 136         .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
 137                  | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
 138                  | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
 139         .rates = SNDRV_PCM_RATE_CONTINUOUS,
 140         .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
 141         .buffer_bytes_max = BUFF_SIZE_MAX,
 142         .period_bytes_max = PRD_SIZE_MAX,
 143         .periods_min = MIN_PERIODS,
 144 };
 145
 146 struct audio_dev {
 147         /* Currently active {Interface[15:8] | AltSettings[7:0]} */
 148         __u16 ac_alt, as_out_alt, as_in_alt;
 149
 150         struct usb_ep *in_ep, *out_ep;
 151         struct usb_function func;
 152
 153         /* The ALSA Sound Card it represents on the USB-Client side */
 154         struct snd_uac2_chip uac2;
 155 };
 156
 157 static struct audio_dev *agdev_g;
 158
 159 static inline
 160 struct audio_dev *func_to_agdev(struct usb_function *f)
 161 {
 162         return container_of(f, struct audio_dev, func);
 163 }
 164
 165 static inline
 166 struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
 167 {
 168         return container_of(u, struct audio_dev, uac2);
 169 }
 170
 171 static inline
 172 struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
 173 {
 174         return container_of(p, struct snd_uac2_chip, pdev);
 175 }
 176
 177 static inline
 178 struct snd_uac2_chip *prm_to_uac2(struct uac2_rtd_params *r)
 179 {
 180         struct snd_uac2_chip *uac2 = container_of(r,
 181                                         struct snd_uac2_chip, c_prm);
 182
 183         if (&uac2->c_prm != r)
 184                 uac2 = container_of(r, struct snd_uac2_chip, p_prm);
 185
 186         return uac2;
 187 }
 188
 189 static inline
 190 uint num_channels(uint chanmask)
 191 {
 192         uint num = 0;
 193
 194         while (chanmask) {
 195                 num += (chanmask & 1);
 196                 chanmask >>= 1;
 197         }
 198
 199         return num;
 200 }
 201
 202 static void
 203 agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
 204 {
 205         unsigned pending;
 206         unsigned long flags;
 207         bool update_alsa = false;
 208         unsigned char *src, *dst;
 209         int status = req->status;
 210         struct uac2_req *ur = req->context;
 211         struct snd_pcm_substream *substream;
 212         struct uac2_rtd_params *prm = ur->pp;
 213         struct snd_uac2_chip *uac2 = prm_to_uac2(prm);
 214
 215         /* i/f shutting down */
 216         if (!prm->ep_enabled)
 217                 return;
 218
 219         /*
 220          * We can't really do much about bad xfers.
 221          * Afterall, the ISOCH xfers could fail legitimately.
 222          */
 223         if (status)
 224                 pr_debug("%s: iso_complete status(%d) %d/%d\n",
 225                         __func__, status, req->actual, req->length);
 226
 227         substream = prm->ss;
 228
 229         /* Do nothing if ALSA isn't active */
 230         if (!substream)
 231                 goto exit;
 232
 233         spin_lock_irqsave(&prm->lock, flags);
 234
 235         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 236                 src = prm->dma_area + prm->hw_ptr;
 237                 req->actual = req->length;
 238                 dst = req->buf;
 239         } else {
 240                 dst = prm->dma_area + prm->hw_ptr;
 241                 src = req->buf;
 242         }
 243
 244         pending = prm->hw_ptr % prm->period_size;
 245         pending += req->actual;
 246         if (pending >= prm->period_size)
 247                 update_alsa = true;
 248
 249         prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
 250
 251         spin_unlock_irqrestore(&prm->lock, flags);
 252
 253         /* Pack USB load in ALSA ring buffer */
 254         memcpy(dst, src, req->actual);
 255 exit:
 256         if (usb_ep_queue(ep, req, GFP_ATOMIC))
 257                 dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
 258
 259         if (update_alsa)
 260                 snd_pcm_period_elapsed(substream);
 261
 262         return;
 263 }
 264
 265 static int
 266 uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 267 {
 268         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 269         struct audio_dev *agdev = uac2_to_agdev(uac2);
 270         struct uac2_rtd_params *prm;
 271         unsigned long flags;
 272         struct usb_ep *ep;
 273         int err = 0;
 274
 275         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 276                 ep = agdev->in_ep;
 277                 prm = &uac2->p_prm;
 278         } else {
 279                 ep = agdev->out_ep;
 280                 prm = &uac2->c_prm;
 281         }
 282
 283         spin_lock_irqsave(&prm->lock, flags);
 284
 285         /* Reset */
 286         prm->hw_ptr = 0;
 287
 288         switch (cmd) {
 289         case SNDRV_PCM_TRIGGER_START:
 290         case SNDRV_PCM_TRIGGER_RESUME:
 291                 prm->ss = substream;
 292                 break;
 293         case SNDRV_PCM_TRIGGER_STOP:
 294         case SNDRV_PCM_TRIGGER_SUSPEND:
 295                 prm->ss = NULL;
 296                 break;
 297         default:
 298                 err = -EINVAL;
 299         }
 300
 301         spin_unlock_irqrestore(&prm->lock, flags);
 302
 303         /* Clear buffer after Play stops */
 304         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
 305                 memset(prm->rbuf, 0, prm->max_psize * USB_XFERS);
 306
 307         return err;
 308 }
 309
 310 static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream)
 311 {
 312         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 313         struct uac2_rtd_params *prm;
 314
 315         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 316                 prm = &uac2->p_prm;
 317         else
 318                 prm = &uac2->c_prm;
 319
 320         return bytes_to_frames(substream->runtime, prm->hw_ptr);
 321 }
 322
 323 static int uac2_pcm_hw_params(struct snd_pcm_substream *substream,
 324                                struct snd_pcm_hw_params *hw_params)
 325 {
 326         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 327         struct uac2_rtd_params *prm;
 328         int err;
 329
 330         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 331                 prm = &uac2->p_prm;
 332         else
 333                 prm = &uac2->c_prm;
 334
 335         err = snd_pcm_lib_malloc_pages(substream,
 336                                         params_buffer_bytes(hw_params));
 337         if (err >= 0) {
 338                 prm->dma_bytes = substream->runtime->dma_bytes;
 339                 prm->dma_area = substream->runtime->dma_area;
 340                 prm->period_size = params_period_bytes(hw_params);
 341         }
 342
 343         return err;
 344 }
 345
 346 static int uac2_pcm_hw_free(struct snd_pcm_substream *substream)
 347 {
 348         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 349         struct uac2_rtd_params *prm;
 350
 351         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 352                 prm = &uac2->p_prm;
 353         else
 354                 prm = &uac2->c_prm;
 355
 356         prm->dma_area = NULL;
 357         prm->dma_bytes = 0;
 358         prm->period_size = 0;
 359
 360         return snd_pcm_lib_free_pages(substream);
 361 }
 362
 363 static int uac2_pcm_open(struct snd_pcm_substream *substream)
 364 {
 365         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 366         struct snd_pcm_runtime *runtime = substream->runtime;
 367
 368         runtime->hw = uac2_pcm_hardware;
 369
 370         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 371                 spin_lock_init(&uac2->p_prm.lock);
 372                 runtime->hw.rate_min = p_srate;
 373                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; /* ! p_ssize ! */
 374                 runtime->hw.channels_min = num_channels(p_chmask);
 375                 runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize
 376                                                 / runtime->hw.periods_min;
 377         } else {
 378                 spin_lock_init(&uac2->c_prm.lock);
 379                 runtime->hw.rate_min = c_srate;
 380                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE; /* ! c_ssize ! */
 381                 runtime->hw.channels_min = num_channels(c_chmask);
 382                 runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize
 383                                                 / runtime->hw.periods_min;
 384         }
 385
 386         runtime->hw.rate_max = runtime->hw.rate_min;
 387         runtime->hw.channels_max = runtime->hw.channels_min;
 388
 389         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 390
 391         return 0;
 392 }
 393
 394 /* ALSA cries without these function pointers */
 395 static int uac2_pcm_null(struct snd_pcm_substream *substream)
 396 {
 397         return 0;
 398 }
 399
 400 static struct snd_pcm_ops uac2_pcm_ops = {
 401         .open = uac2_pcm_open,
 402         .close = uac2_pcm_null,
 403         .ioctl = snd_pcm_lib_ioctl,
 404         .hw_params = uac2_pcm_hw_params,
 405         .hw_free = uac2_pcm_hw_free,
 406         .trigger = uac2_pcm_trigger,
 407         .pointer = uac2_pcm_pointer,
 408         .prepare = uac2_pcm_null,
 409 };
 410
 411 static int __devinit snd_uac2_probe(struct platform_device *pdev)
 412 {
 413         struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev);
 414         struct snd_card *card;
 415         struct snd_pcm *pcm;
 416         int err;
 417
 418         /* Choose any slot, with no id */
 419         err = snd_card_create(-1, NULL, THIS_MODULE, 0, &card);
 420         if (err < 0)
 421                 return err;
 422
 423         uac2->card = card;
 424
 425         /*
 426          * Create first PCM device
 427          * Create a substream only for non-zero channel streams
 428          */
 429         err = snd_pcm_new(uac2->card, "UAC2 PCM", 0,
 430                                p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
 431         if (err < 0)
 432                 goto snd_fail;
 433
 434         strcpy(pcm->name, "UAC2 PCM");
 435         pcm->private_data = uac2;
 436
 437         uac2->pcm = pcm;
 438
 439         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops);
 440         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops);
 441
 442         strcpy(card->driver, "UAC2_Gadget");
 443         strcpy(card->shortname, "UAC2_Gadget");
 444         sprintf(card->longname, "UAC2_Gadget %i", pdev->id);
 445
 446         snd_card_set_dev(card, &pdev->dev);
 447
 448         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 449                 snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
 450
 451         err = snd_card_register(card);
 452         if (!err) {
 453                 platform_set_drvdata(pdev, card);
 454                 return 0;
 455         }
 456
 457 snd_fail:
 458         snd_card_free(card);
 459
 460         uac2->pcm = NULL;
 461         uac2->card = NULL;
 462
 463         return err;
 464 }
 465
 466 static int snd_uac2_remove(struct platform_device *pdev)
 467 {
 468         struct snd_card *card = platform_get_drvdata(pdev);
 469
 470         platform_set_drvdata(pdev, NULL);
 471
 472         if (card)
 473                 return snd_card_free(card);
 474
 475         return 0;
 476 }
 477
 478 static int alsa_uac2_init(struct audio_dev *agdev)
 479 {
 480         struct snd_uac2_chip *uac2 = &agdev->uac2;
 481         int err;
 482
 483         uac2->pdrv.probe = snd_uac2_probe;
 484         uac2->pdrv.remove = snd_uac2_remove;
 485         uac2->pdrv.driver.name = uac2_name;
 486
 487         uac2->pdev.id = 0;
 488         uac2->pdev.name = uac2_name;
 489
 490         /* Register snd_uac2 driver */
 491         err = platform_driver_register(&uac2->pdrv);
 492         if (err)
 493                 return err;
 494
 495         /* Register snd_uac2 device */
 496         err = platform_device_register(&uac2->pdev);
 497         if (err)
 498                 platform_driver_unregister(&uac2->pdrv);
 499
 500         return err;
 501 }
 502
 503 static void alsa_uac2_exit(struct audio_dev *agdev)
 504 {
 505         struct snd_uac2_chip *uac2 = &agdev->uac2;
 506
 507         platform_driver_unregister(&uac2->pdrv);
 508         platform_device_unregister(&uac2->pdev);
 509 }
 510
 511
 512 /* --------- USB Function Interface ------------- */
 513
 514 enum {
 515         STR_ASSOC,
 516         STR_IF_CTRL,
 517         STR_CLKSRC_IN,
 518         STR_CLKSRC_OUT,
 519         STR_USB_IT,
 520         STR_IO_IT,
 521         STR_USB_OT,
 522         STR_IO_OT,
 523         STR_AS_OUT_ALT0,
 524         STR_AS_OUT_ALT1,
 525         STR_AS_IN_ALT0,
 526         STR_AS_IN_ALT1,
 527 };
 528
 529 static const char ifassoc[] = "Source/Sink";
 530 static const char ifctrl[] = "Topology Control";
 531 static char clksrc_in[8];
 532 static char clksrc_out[8];
 533 static const char usb_it[] = "USBH Out";
 534 static const char io_it[] = "USBD Out";
 535 static const char usb_ot[] = "USBH In";
 536 static const char io_ot[] = "USBD In";
 537 static const char out_alt0[] = "Playback Inactive";
 538 static const char out_alt1[] = "Playback Active";
 539 static const char in_alt0[] = "Capture Inactive";
 540 static const char in_alt1[] = "Capture Active";
 541
 542 static struct usb_string strings_fn[] = {
 543         [STR_ASSOC].s = ifassoc,
 544         [STR_IF_CTRL].s = ifctrl,
 545         [STR_CLKSRC_IN].s = clksrc_in,
 546         [STR_CLKSRC_OUT].s = clksrc_out,
 547         [STR_USB_IT].s = usb_it,
 548         [STR_IO_IT].s = io_it,
 549         [STR_USB_OT].s = usb_ot,
 550         [STR_IO_OT].s = io_ot,
 551         [STR_AS_OUT_ALT0].s = out_alt0,
 552         [STR_AS_OUT_ALT1].s = out_alt1,
 553         [STR_AS_IN_ALT0].s = in_alt0,
 554         [STR_AS_IN_ALT1].s = in_alt1,
 555         { },
 556 };
 557
 558 static struct usb_gadget_strings str_fn = {
 559         .language = 0x0409,     /* en-us */
 560         .strings = strings_fn,
 561 };
 562
 563 static struct usb_gadget_strings *fn_strings[] = {
 564         &str_fn,
 565         NULL,
 566 };
 567
 568 static struct usb_qualifier_descriptor devqual_desc = {
 569         .bLength = sizeof devqual_desc,
 570         .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
 571
 572         .bcdUSB = cpu_to_le16(0x200),
 573         .bDeviceClass = USB_CLASS_MISC,
 574         .bDeviceSubClass = 0x02,
 575         .bDeviceProtocol = 0x01,
 576         .bNumConfigurations = 1,
 577         .bRESERVED = 0,
 578 };
 579
 580 static struct usb_interface_assoc_descriptor iad_desc = {
 581         .bLength = sizeof iad_desc,
 582         .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
 583
 584         .bFirstInterface = 0,
 585         .bInterfaceCount = 3,
 586         .bFunctionClass = USB_CLASS_AUDIO,
 587         .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
 588         .bFunctionProtocol = UAC_VERSION_2,
 589 };
 590
 591 /* Audio Control Interface */
 592 static struct usb_interface_descriptor std_ac_if_desc = {
 593         .bLength = sizeof std_ac_if_desc,
 594         .bDescriptorType = USB_DT_INTERFACE,
 595
 596         .bAlternateSetting = 0,
 597         .bNumEndpoints = 0,
 598         .bInterfaceClass = USB_CLASS_AUDIO,
 599         .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
 600         .bInterfaceProtocol = UAC_VERSION_2,
 601 };
 602
 603 /* Clock source for IN traffic */
 604 struct uac_clock_source_descriptor in_clk_src_desc = {
 605         .bLength = sizeof in_clk_src_desc,
 606         .bDescriptorType = USB_DT_CS_INTERFACE,
 607
 608         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 609         .bClockID = USB_IN_CLK_ID,
 610         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 611         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 612         .bAssocTerminal = 0,
 613 };
 614
 615 /* Clock source for OUT traffic */
 616 struct uac_clock_source_descriptor out_clk_src_desc = {
 617         .bLength = sizeof out_clk_src_desc,
 618         .bDescriptorType = USB_DT_CS_INTERFACE,
 619
 620         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 621         .bClockID = USB_OUT_CLK_ID,
 622         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 623         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 624         .bAssocTerminal = 0,
 625 };
 626
 627 /* Input Terminal for USB_OUT */
 628 struct uac2_input_terminal_descriptor usb_out_it_desc = {
 629         .bLength = sizeof usb_out_it_desc,
 630         .bDescriptorType = USB_DT_CS_INTERFACE,
 631
 632         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 633         .bTerminalID = USB_OUT_IT_ID,
 634         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 635         .bAssocTerminal = 0,
 636         .bCSourceID = USB_OUT_CLK_ID,
 637         .iChannelNames = 0,
 638         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 639 };
 640
 641 /* Input Terminal for I/O-In */
 642 struct uac2_input_terminal_descriptor io_in_it_desc = {
 643         .bLength = sizeof io_in_it_desc,
 644         .bDescriptorType = USB_DT_CS_INTERFACE,
 645
 646         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 647         .bTerminalID = IO_IN_IT_ID,
 648         .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
 649         .bAssocTerminal = 0,
 650         .bCSourceID = USB_IN_CLK_ID,
 651         .iChannelNames = 0,
 652         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 653 };
 654
 655 /* Ouput Terminal for USB_IN */
 656 struct uac2_output_terminal_descriptor usb_in_ot_desc = {
 657         .bLength = sizeof usb_in_ot_desc,
 658         .bDescriptorType = USB_DT_CS_INTERFACE,
 659
 660         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 661         .bTerminalID = USB_IN_OT_ID,
 662         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 663         .bAssocTerminal = 0,
 664         .bSourceID = IO_IN_IT_ID,
 665         .bCSourceID = USB_IN_CLK_ID,
 666         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 667 };
 668
 669 /* Ouput Terminal for I/O-Out */
 670 struct uac2_output_terminal_descriptor io_out_ot_desc = {
 671         .bLength = sizeof io_out_ot_desc,
 672         .bDescriptorType = USB_DT_CS_INTERFACE,
 673
 674         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 675         .bTerminalID = IO_OUT_OT_ID,
 676         .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
 677         .bAssocTerminal = 0,
 678         .bSourceID = USB_OUT_IT_ID,
 679         .bCSourceID = USB_OUT_CLK_ID,
 680         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 681 };
 682
 683 struct uac2_ac_header_descriptor ac_hdr_desc = {
 684         .bLength = sizeof ac_hdr_desc,
 685         .bDescriptorType = USB_DT_CS_INTERFACE,
 686
 687         .bDescriptorSubtype = UAC_MS_HEADER,
 688         .bcdADC = cpu_to_le16(0x200),
 689         .bCategory = UAC2_FUNCTION_IO_BOX,
 690         .wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc
 691                          + sizeof usb_out_it_desc + sizeof io_in_it_desc
 692                         + sizeof usb_in_ot_desc + sizeof io_out_ot_desc,
 693         .bmControls = 0,
 694 };
 695
 696 /* Audio Streaming OUT Interface - Alt0 */
 697 static struct usb_interface_descriptor std_as_out_if0_desc = {
 698         .bLength = sizeof std_as_out_if0_desc,
 699         .bDescriptorType = USB_DT_INTERFACE,
 700
 701         .bAlternateSetting = 0,
 702         .bNumEndpoints = 0,
 703         .bInterfaceClass = USB_CLASS_AUDIO,
 704         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 705         .bInterfaceProtocol = UAC_VERSION_2,
 706 };
 707
 708 /* Audio Streaming OUT Interface - Alt1 */
 709 static struct usb_interface_descriptor std_as_out_if1_desc = {
 710         .bLength = sizeof std_as_out_if1_desc,
 711         .bDescriptorType = USB_DT_INTERFACE,
 712
 713         .bAlternateSetting = 1,
 714         .bNumEndpoints = 1,
 715         .bInterfaceClass = USB_CLASS_AUDIO,
 716         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 717         .bInterfaceProtocol = UAC_VERSION_2,
 718 };
 719
 720 /* Audio Stream OUT Intface Desc */
 721 struct uac2_as_header_descriptor as_out_hdr_desc = {
 722         .bLength = sizeof as_out_hdr_desc,
 723         .bDescriptorType = USB_DT_CS_INTERFACE,
 724
 725         .bDescriptorSubtype = UAC_AS_GENERAL,
 726         .bTerminalLink = USB_OUT_IT_ID,
 727         .bmControls = 0,
 728         .bFormatType = UAC_FORMAT_TYPE_I,
 729         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 730         .iChannelNames = 0,
 731 };
 732
 733 /* Audio USB_OUT Format */
 734 struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
 735         .bLength = sizeof as_out_fmt1_desc,
 736         .bDescriptorType = USB_DT_CS_INTERFACE,
 737         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 738         .bFormatType = UAC_FORMAT_TYPE_I,
 739 };
 740
 741 /* STD AS ISO OUT Endpoint */
 742 struct usb_endpoint_descriptor fs_epout_desc = {
 743         .bLength = USB_DT_ENDPOINT_SIZE,
 744         .bDescriptorType = USB_DT_ENDPOINT,
 745
 746         .bEndpointAddress = USB_DIR_OUT,
 747         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 748         .bInterval = 1,
 749 };
 750
 751 struct usb_endpoint_descriptor hs_epout_desc = {
 752         .bLength = USB_DT_ENDPOINT_SIZE,
 753         .bDescriptorType = USB_DT_ENDPOINT,
 754
 755         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 756         .bInterval = 4,
 757 };
 758
 759 /* CS AS ISO OUT Endpoint */
 760 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
 761         .bLength = sizeof as_iso_out_desc,
 762         .bDescriptorType = USB_DT_CS_ENDPOINT,
 763
 764         .bDescriptorSubtype = UAC_EP_GENERAL,
 765         .bmAttributes = 0,
 766         .bmControls = 0,
 767         .bLockDelayUnits = 0,
 768         .wLockDelay = 0,
 769 };
 770
 771 /* Audio Streaming IN Interface - Alt0 */
 772 static struct usb_interface_descriptor std_as_in_if0_desc = {
 773         .bLength = sizeof std_as_in_if0_desc,
 774         .bDescriptorType = USB_DT_INTERFACE,
 775
 776         .bAlternateSetting = 0,
 777         .bNumEndpoints = 0,
 778         .bInterfaceClass = USB_CLASS_AUDIO,
 779         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 780         .bInterfaceProtocol = UAC_VERSION_2,
 781 };
 782
 783 /* Audio Streaming IN Interface - Alt1 */
 784 static struct usb_interface_descriptor std_as_in_if1_desc = {
 785         .bLength = sizeof std_as_in_if1_desc,
 786         .bDescriptorType = USB_DT_INTERFACE,
 787
 788         .bAlternateSetting = 1,
 789         .bNumEndpoints = 1,
 790         .bInterfaceClass = USB_CLASS_AUDIO,
 791         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 792         .bInterfaceProtocol = UAC_VERSION_2,
 793 };
 794
 795 /* Audio Stream IN Intface Desc */
 796 struct uac2_as_header_descriptor as_in_hdr_desc = {
 797         .bLength = sizeof as_in_hdr_desc,
 798         .bDescriptorType = USB_DT_CS_INTERFACE,
 799
 800         .bDescriptorSubtype = UAC_AS_GENERAL,
 801         .bTerminalLink = USB_IN_OT_ID,
 802         .bmControls = 0,
 803         .bFormatType = UAC_FORMAT_TYPE_I,
 804         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 805         .iChannelNames = 0,
 806 };
 807
 808 /* Audio USB_IN Format */
 809 struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
 810         .bLength = sizeof as_in_fmt1_desc,
 811         .bDescriptorType = USB_DT_CS_INTERFACE,
 812         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 813         .bFormatType = UAC_FORMAT_TYPE_I,
 814 };
 815
 816 /* STD AS ISO IN Endpoint */
 817 struct usb_endpoint_descriptor fs_epin_desc = {
 818         .bLength = USB_DT_ENDPOINT_SIZE,
 819         .bDescriptorType = USB_DT_ENDPOINT,
 820
 821         .bEndpointAddress = USB_DIR_IN,
 822         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 823         .bInterval = 1,
 824 };
 825
 826 struct usb_endpoint_descriptor hs_epin_desc = {
 827         .bLength = USB_DT_ENDPOINT_SIZE,
 828         .bDescriptorType = USB_DT_ENDPOINT,
 829
 830         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 831         .bInterval = 4,
 832 };
 833
 834 /* CS AS ISO IN Endpoint */
 835 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
 836         .bLength = sizeof as_iso_in_desc,
 837         .bDescriptorType = USB_DT_CS_ENDPOINT,
 838
 839         .bDescriptorSubtype = UAC_EP_GENERAL,
 840         .bmAttributes = 0,
 841         .bmControls = 0,
 842         .bLockDelayUnits = 0,
 843         .wLockDelay = 0,
 844 };
 845
 846 static struct usb_descriptor_header *fs_audio_desc[] = {
 847         (struct usb_descriptor_header *)&iad_desc,
 848         (struct usb_descriptor_header *)&std_ac_if_desc,
 849
 850         (struct usb_descriptor_header *)&ac_hdr_desc,
 851         (struct usb_descriptor_header *)&in_clk_src_desc,
 852         (struct usb_descriptor_header *)&out_clk_src_desc,
 853         (struct usb_descriptor_header *)&usb_out_it_desc,
 854         (struct usb_descriptor_header *)&io_in_it_desc,
 855         (struct usb_descriptor_header *)&usb_in_ot_desc,
 856         (struct usb_descriptor_header *)&io_out_ot_desc,
 857
 858         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 859         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 860
 861         (struct usb_descriptor_header *)&as_out_hdr_desc,
 862         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 863         (struct usb_descriptor_header *)&fs_epout_desc,
 864         (struct usb_descriptor_header *)&as_iso_out_desc,
 865
 866         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 867         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 868
 869         (struct usb_descriptor_header *)&as_in_hdr_desc,
 870         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 871         (struct usb_descriptor_header *)&fs_epin_desc,
 872         (struct usb_descriptor_header *)&as_iso_in_desc,
 873         NULL,
 874 };
 875
 876 static struct usb_descriptor_header *hs_audio_desc[] = {
 877         (struct usb_descriptor_header *)&iad_desc,
 878         (struct usb_descriptor_header *)&std_ac_if_desc,
 879
 880         (struct usb_descriptor_header *)&ac_hdr_desc,
 881         (struct usb_descriptor_header *)&in_clk_src_desc,
 882         (struct usb_descriptor_header *)&out_clk_src_desc,
 883         (struct usb_descriptor_header *)&usb_out_it_desc,
 884         (struct usb_descriptor_header *)&io_in_it_desc,
 885         (struct usb_descriptor_header *)&usb_in_ot_desc,
 886         (struct usb_descriptor_header *)&io_out_ot_desc,
 887
 888         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 889         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 890
 891         (struct usb_descriptor_header *)&as_out_hdr_desc,
 892         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 893         (struct usb_descriptor_header *)&hs_epout_desc,
 894         (struct usb_descriptor_header *)&as_iso_out_desc,
 895
 896         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 897         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 898
 899         (struct usb_descriptor_header *)&as_in_hdr_desc,
 900         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 901         (struct usb_descriptor_header *)&hs_epin_desc,
 902         (struct usb_descriptor_header *)&as_iso_in_desc,
 903         NULL,
 904 };
 905
 906 struct cntrl_cur_lay3 {
 907         __u32   dCUR;
 908 };
 909
 910 struct cntrl_range_lay3 {
 911         __u16   wNumSubRanges;
 912         __u32   dMIN;
 913         __u32   dMAX;
 914         __u32   dRES;
 915 } __packed;
 916
 917 static inline void
 918 free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
 919 {
 920         struct snd_uac2_chip *uac2 = prm_to_uac2(prm);
 921         int i;
 922
 923         prm->ep_enabled = false;
 924
 925         for (i = 0; i < USB_XFERS; i++) {
 926                 if (prm->ureq[i].req) {
 927                         usb_ep_dequeue(ep, prm->ureq[i].req);
 928                         usb_ep_free_request(ep, prm->ureq[i].req);
 929                         prm->ureq[i].req = NULL;
 930                 }
 931         }
 932
 933         if (usb_ep_disable(ep))
 934                 dev_err(&uac2->pdev.dev,
 935                         "%s:%d Error!\n", __func__, __LINE__);
 936 }
 937
 938 static int __init
 939 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 940 {
 941         struct audio_dev *agdev = func_to_agdev(fn);
 942         struct snd_uac2_chip *uac2 = &agdev->uac2;
 943         struct usb_composite_dev *cdev = cfg->cdev;
 944         struct usb_gadget *gadget = cdev->gadget;
 945         struct uac2_rtd_params *prm;
 946         int ret;
 947
 948         ret = usb_interface_id(cfg, fn);
 949         if (ret < 0) {
 950                 dev_err(&uac2->pdev.dev,
 951                         "%s:%d Error!\n", __func__, __LINE__);
 952                 return ret;
 953         }
 954         std_ac_if_desc.bInterfaceNumber = ret;
 955         ALT_SET(agdev->ac_alt, 0);
 956         INTF_SET(agdev->ac_alt, ret);
 957
 958         ret = usb_interface_id(cfg, fn);
 959         if (ret < 0) {
 960                 dev_err(&uac2->pdev.dev,
 961                         "%s:%d Error!\n", __func__, __LINE__);
 962                 return ret;
 963         }
 964         std_as_out_if0_desc.bInterfaceNumber = ret;
 965         std_as_out_if1_desc.bInterfaceNumber = ret;
 966         ALT_SET(agdev->as_out_alt, 0);
 967         INTF_SET(agdev->as_out_alt, ret);
 968
 969         ret = usb_interface_id(cfg, fn);
 970         if (ret < 0) {
 971                 dev_err(&uac2->pdev.dev,
 972                         "%s:%d Error!\n", __func__, __LINE__);
 973                 return ret;
 974         }
 975         std_as_in_if0_desc.bInterfaceNumber = ret;
 976         std_as_in_if1_desc.bInterfaceNumber = ret;
 977         ALT_SET(agdev->as_in_alt, 0);
 978         INTF_SET(agdev->as_in_alt, ret);
 979
 980         agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
 981         if (!agdev->out_ep)
 982                 dev_err(&uac2->pdev.dev,
 983                         "%s:%d Error!\n", __func__, __LINE__);
 984         agdev->out_ep->driver_data = agdev;
 985
 986         agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
 987         if (!agdev->in_ep)
 988                 dev_err(&uac2->pdev.dev,
 989                         "%s:%d Error!\n", __func__, __LINE__);
 990         agdev->in_ep->driver_data = agdev;
 991
 992         hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
 993         hs_epout_desc.wMaxPacketSize = fs_epout_desc.wMaxPacketSize;
 994         hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
 995         hs_epin_desc.wMaxPacketSize = fs_epin_desc.wMaxPacketSize;
 996
 997         fn->descriptors = usb_copy_descriptors(fs_audio_desc);
 998         if (gadget_is_dualspeed(gadget))
 999                 fn->hs_descriptors = usb_copy_descriptors(hs_audio_desc);
1000
1001         prm = &agdev->uac2.c_prm;
1002         prm->max_psize = hs_epout_desc.wMaxPacketSize;
1003         prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1004         if (!prm->rbuf) {
1005                 prm->max_psize = 0;
1006                 dev_err(&uac2->pdev.dev,
1007                         "%s:%d Error!\n", __func__, __LINE__);
1008         }
1009
1010         prm = &agdev->uac2.p_prm;
1011         prm->max_psize = hs_epin_desc.wMaxPacketSize;
1012         prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1013         if (!prm->rbuf) {
1014                 prm->max_psize = 0;
1015                 dev_err(&uac2->pdev.dev,
1016                         "%s:%d Error!\n", __func__, __LINE__);
1017         }
1018
1019         return alsa_uac2_init(agdev);
1020 }
1021
1022 static void
1023 afunc_unbind(struct usb_configuration *cfg, struct usb_function *fn)
1024 {
1025         struct audio_dev *agdev = func_to_agdev(fn);
1026         struct usb_composite_dev *cdev = cfg->cdev;
1027         struct usb_gadget *gadget = cdev->gadget;
1028         struct uac2_rtd_params *prm;
1029
1030         alsa_uac2_exit(agdev);
1031
1032         prm = &agdev->uac2.p_prm;
1033         kfree(prm->rbuf);
1034
1035         prm = &agdev->uac2.c_prm;
1036         kfree(prm->rbuf);
1037
1038         if (gadget_is_dualspeed(gadget))
1039                 usb_free_descriptors(fn->hs_descriptors);
1040         usb_free_descriptors(fn->descriptors);
1041
1042         if (agdev->in_ep)
1043                 agdev->in_ep->driver_data = NULL;
1044         if (agdev->out_ep)
1045                 agdev->out_ep->driver_data = NULL;
1046 }
1047
1048 static int
1049 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1050 {
1051         struct usb_composite_dev *cdev = fn->config->cdev;
1052         struct audio_dev *agdev = func_to_agdev(fn);
1053         struct snd_uac2_chip *uac2 = &agdev->uac2;
1054         struct usb_gadget *gadget = cdev->gadget;
1055         struct usb_request *req;
1056         struct usb_ep *ep;
1057         struct uac2_rtd_params *prm;
1058         int i;
1059
1060         /* No i/f has more than 2 alt settings */
1061         if (alt > 1) {
1062                 dev_err(&uac2->pdev.dev,
1063                         "%s:%d Error!\n", __func__, __LINE__);
1064                 return -EINVAL;
1065         }
1066
1067         if (intf == INTF_GET(agdev->ac_alt)) {
1068                 /* Control I/f has only 1 AltSetting - 0 */
1069                 if (alt) {
1070                         dev_err(&uac2->pdev.dev,
1071                                 "%s:%d Error!\n", __func__, __LINE__);
1072                         return -EINVAL;
1073                 }
1074                 return 0;
1075         }
1076
1077         if (intf == INTF_GET(agdev->as_out_alt)) {
1078                 ep = agdev->out_ep;
1079                 prm = &uac2->c_prm;
1080                 config_ep_by_speed(gadget, fn, ep);
1081                 ALT_SET(agdev->as_out_alt, alt);
1082         } else if (intf == INTF_GET(agdev->as_in_alt)) {
1083                 ep = agdev->in_ep;
1084                 prm = &uac2->p_prm;
1085                 config_ep_by_speed(gadget, fn, ep);
1086                 ALT_SET(agdev->as_in_alt, alt);
1087         } else {
1088                 dev_err(&uac2->pdev.dev,
1089                         "%s:%d Error!\n", __func__, __LINE__);
1090                 return -EINVAL;
1091         }
1092
1093         if (alt == 0) {
1094                 free_ep(prm, ep);
1095                 return 0;
1096         }
1097
1098         prm->ep_enabled = true;
1099         usb_ep_enable(ep);
1100
1101         for (i = 0; i < USB_XFERS; i++) {
1102                 if (prm->ureq[i].req) {
1103                         if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
1104                                 dev_err(&uac2->pdev.dev, "%d Error!\n",
1105                                         __LINE__);
1106                         continue;
1107                 }
1108
1109                 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
1110                 if (req == NULL) {
1111                         dev_err(&uac2->pdev.dev,
1112                                 "%s:%d Error!\n", __func__, __LINE__);
1113                         return -EINVAL;
1114                 }
1115
1116                 prm->ureq[i].req = req;
1117                 prm->ureq[i].pp = prm;
1118
1119                 req->zero = 0;
1120                 req->dma = DMA_ADDR_INVALID;
1121                 req->context = &prm->ureq[i];
1122                 req->length = prm->max_psize;
1123                 req->complete = agdev_iso_complete;
1124                 req->buf = prm->rbuf + i * req->length;
1125
1126                 if (usb_ep_queue(ep, req, GFP_ATOMIC))
1127                         dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
1128         }
1129
1130         return 0;
1131 }
1132
1133 static int
1134 afunc_get_alt(struct usb_function *fn, unsigned intf)
1135 {
1136         struct audio_dev *agdev = func_to_agdev(fn);
1137         struct snd_uac2_chip *uac2 = &agdev->uac2;
1138
1139         if (intf == INTF_GET(agdev->ac_alt))
1140                 return ALT_GET(agdev->ac_alt);
1141         else if (intf == INTF_GET(agdev->as_out_alt))
1142                 return ALT_GET(agdev->as_out_alt);
1143         else if (intf == INTF_GET(agdev->as_in_alt))
1144                 return ALT_GET(agdev->as_in_alt);
1145         else
1146                 dev_err(&uac2->pdev.dev,
1147                         "%s:%d Invalid Interface %d!\n",
1148                         __func__, __LINE__, intf);
1149
1150         return -EINVAL;
1151 }
1152
1153 static void
1154 afunc_disable(struct usb_function *fn)
1155 {
1156         struct audio_dev *agdev = func_to_agdev(fn);
1157         struct snd_uac2_chip *uac2 = &agdev->uac2;
1158
1159         free_ep(&uac2->p_prm, agdev->in_ep);
1160         ALT_SET(agdev->as_in_alt, 0);
1161
1162         free_ep(&uac2->c_prm, agdev->out_ep);
1163         ALT_SET(agdev->as_out_alt, 0);
1164 }
1165
1166 static int
1167 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1168 {
1169         struct usb_request *req = fn->config->cdev->req;
1170         struct audio_dev *agdev = func_to_agdev(fn);
1171         struct snd_uac2_chip *uac2 = &agdev->uac2;
1172         u16 w_length = le16_to_cpu(cr->wLength);
1173         u16 w_index = le16_to_cpu(cr->wIndex);
1174         u16 w_value = le16_to_cpu(cr->wValue);
1175         u8 entity_id = (w_index >> 8) & 0xff;
1176         u8 control_selector = w_value >> 8;
1177         int value = -EOPNOTSUPP;
1178
1179         if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1180                 struct cntrl_cur_lay3 c;
1181
1182                 if (entity_id == USB_IN_CLK_ID)
1183                         c.dCUR = p_srate;
1184                 else if (entity_id == USB_OUT_CLK_ID)
1185                         c.dCUR = c_srate;
1186
1187                 value = min_t(unsigned, w_length, sizeof c);
1188                 memcpy(req->buf, &c, value);
1189         } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1190                 *(u8 *)req->buf = 1;
1191                 value = min_t(unsigned, w_length, 1);
1192         } else {
1193                 dev_err(&uac2->pdev.dev,
1194                         "%s:%d control_selector=%d TODO!\n",
1195                         __func__, __LINE__, control_selector);
1196         }
1197
1198         return value;
1199 }
1200
1201 static int
1202 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1203 {
1204         struct usb_request *req = fn->config->cdev->req;
1205         struct audio_dev *agdev = func_to_agdev(fn);
1206         struct snd_uac2_chip *uac2 = &agdev->uac2;
1207         u16 w_length = le16_to_cpu(cr->wLength);
1208         u16 w_index = le16_to_cpu(cr->wIndex);
1209         u16 w_value = le16_to_cpu(cr->wValue);
1210         u8 entity_id = (w_index >> 8) & 0xff;
1211         u8 control_selector = w_value >> 8;
1212         struct cntrl_range_lay3 r;
1213         int value = -EOPNOTSUPP;
1214
1215         if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1216                 if (entity_id == USB_IN_CLK_ID)
1217                         r.dMIN = p_srate;
1218                 else if (entity_id == USB_OUT_CLK_ID)
1219                         r.dMIN = c_srate;
1220                 else
1221                         return -EOPNOTSUPP;
1222
1223                 r.dMAX = r.dMIN;
1224                 r.dRES = 0;
1225                 r.wNumSubRanges = 1;
1226
1227                 value = min_t(unsigned, w_length, sizeof r);
1228                 memcpy(req->buf, &r, value);
1229         } else {
1230                 dev_err(&uac2->pdev.dev,
1231                         "%s:%d control_selector=%d TODO!\n",
1232                         __func__, __LINE__, control_selector);
1233         }
1234
1235         return value;
1236 }
1237
1238 static int
1239 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1240 {
1241         if (cr->bRequest == UAC2_CS_CUR)
1242                 return in_rq_cur(fn, cr);
1243         else if (cr->bRequest == UAC2_CS_RANGE)
1244                 return in_rq_range(fn, cr);
1245         else
1246                 return -EOPNOTSUPP;
1247 }
1248
1249 static int
1250 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1251 {
1252         u16 w_length = le16_to_cpu(cr->wLength);
1253         u16 w_value = le16_to_cpu(cr->wValue);
1254         u8 control_selector = w_value >> 8;
1255
1256         if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
1257                 return w_length;
1258
1259         return -EOPNOTSUPP;
1260 }
1261
1262 static int
1263 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1264 {
1265         struct audio_dev *agdev = func_to_agdev(fn);
1266         struct snd_uac2_chip *uac2 = &agdev->uac2;
1267         u16 w_index = le16_to_cpu(cr->wIndex);
1268         u8 intf = w_index & 0xff;
1269
1270         if (intf != INTF_GET(agdev->ac_alt)) {
1271                 dev_err(&uac2->pdev.dev,
1272                         "%s:%d Error!\n", __func__, __LINE__);
1273                 return -EOPNOTSUPP;
1274         }
1275
1276         if (cr->bRequestType & USB_DIR_IN)
1277                 return ac_rq_in(fn, cr);
1278         else if (cr->bRequest == UAC2_CS_CUR)
1279                 return out_rq_cur(fn, cr);
1280
1281         return -EOPNOTSUPP;
1282 }
1283
1284 static int
1285 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1286 {
1287         struct usb_composite_dev *cdev = fn->config->cdev;
1288         struct audio_dev *agdev = func_to_agdev(fn);
1289         struct snd_uac2_chip *uac2 = &agdev->uac2;
1290         struct usb_request *req = cdev->req;
1291         u16 w_length = le16_to_cpu(cr->wLength);
1292         int value = -EOPNOTSUPP;
1293
1294         /* Only Class specific requests are supposed to reach here */
1295         if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1296                 return -EOPNOTSUPP;
1297
1298         if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1299                 value = setup_rq_inf(fn, cr);
1300         else
1301                 dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__);
1302
1303         if (value >= 0) {
1304                 req->length = value;
1305                 req->zero = value < w_length;
1306                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1307                 if (value < 0) {
1308                         dev_err(&uac2->pdev.dev,
1309                                 "%s:%d Error!\n", __func__, __LINE__);
1310                         req->status = 0;
1311                 }
1312         }
1313
1314         return value;
1315 }
1316
1317 static int audio_bind_config(struct usb_configuration *cfg)
1318 {
1319         int id, res;
1320
1321         agdev_g = kzalloc(sizeof *agdev_g, GFP_KERNEL);
1322         if (agdev_g == NULL) {
1323                 printk(KERN_ERR "Unable to allocate audio gadget\n");
1324                 return -ENOMEM;
1325         }
1326
1327         id = usb_string_id(cfg->cdev);
1328         if (id < 0)
1329                 return id;
1330
1331         strings_fn[STR_ASSOC].id = id;
1332         iad_desc.iFunction = id,
1333
1334         id = usb_string_id(cfg->cdev);
1335         if (id < 0)
1336                 return id;
1337
1338         strings_fn[STR_IF_CTRL].id = id;
1339         std_ac_if_desc.iInterface = id,
1340
1341         id = usb_string_id(cfg->cdev);
1342         if (id < 0)
1343                 return id;
1344
1345         strings_fn[STR_CLKSRC_IN].id = id;
1346         in_clk_src_desc.iClockSource = id,
1347
1348         id = usb_string_id(cfg->cdev);
1349         if (id < 0)
1350                 return id;
1351
1352         strings_fn[STR_CLKSRC_OUT].id = id;
1353         out_clk_src_desc.iClockSource = id,
1354
1355         id = usb_string_id(cfg->cdev);
1356         if (id < 0)
1357                 return id;
1358
1359         strings_fn[STR_USB_IT].id = id;
1360         usb_out_it_desc.iTerminal = id,
1361
1362         id = usb_string_id(cfg->cdev);
1363         if (id < 0)
1364                 return id;
1365
1366         strings_fn[STR_IO_IT].id = id;
1367         io_in_it_desc.iTerminal = id;
1368
1369         id = usb_string_id(cfg->cdev);
1370         if (id < 0)
1371                 return id;
1372
1373         strings_fn[STR_USB_OT].id = id;
1374         usb_in_ot_desc.iTerminal = id;
1375
1376         id = usb_string_id(cfg->cdev);
1377         if (id < 0)
1378                 return id;
1379
1380         strings_fn[STR_IO_OT].id = id;
1381         io_out_ot_desc.iTerminal = id;
1382
1383         id = usb_string_id(cfg->cdev);
1384         if (id < 0)
1385                 return id;
1386
1387         strings_fn[STR_AS_OUT_ALT0].id = id;
1388         std_as_out_if0_desc.iInterface = id;
1389
1390         id = usb_string_id(cfg->cdev);
1391         if (id < 0)
1392                 return id;
1393
1394         strings_fn[STR_AS_OUT_ALT1].id = id;
1395         std_as_out_if1_desc.iInterface = id;
1396
1397         id = usb_string_id(cfg->cdev);
1398         if (id < 0)
1399                 return id;
1400
1401         strings_fn[STR_AS_IN_ALT0].id = id;
1402         std_as_in_if0_desc.iInterface = id;
1403
1404         id = usb_string_id(cfg->cdev);
1405         if (id < 0)
1406                 return id;
1407
1408         strings_fn[STR_AS_IN_ALT1].id = id;
1409         std_as_in_if1_desc.iInterface = id;
1410
1411         agdev_g->func.name = "uac2_func";
1412         agdev_g->func.strings = fn_strings;
1413         agdev_g->func.bind = afunc_bind;
1414         agdev_g->func.unbind = afunc_unbind;
1415         agdev_g->func.set_alt = afunc_set_alt;
1416         agdev_g->func.get_alt = afunc_get_alt;
1417         agdev_g->func.disable = afunc_disable;
1418         agdev_g->func.setup = afunc_setup;
1419
1420         /* Initialize the configurable parameters */
1421         usb_out_it_desc.bNrChannels = num_channels(c_chmask);
1422         usb_out_it_desc.bmChannelConfig = cpu_to_le32(c_chmask);
1423         io_in_it_desc.bNrChannels = num_channels(p_chmask);
1424         io_in_it_desc.bmChannelConfig = cpu_to_le32(p_chmask);
1425         as_out_hdr_desc.bNrChannels = num_channels(c_chmask);
1426         as_out_hdr_desc.bmChannelConfig = cpu_to_le32(c_chmask);
1427         as_in_hdr_desc.bNrChannels = num_channels(p_chmask);
1428         as_in_hdr_desc.bmChannelConfig = cpu_to_le32(p_chmask);
1429         as_out_fmt1_desc.bSubslotSize = c_ssize;
1430         as_out_fmt1_desc.bBitResolution = c_ssize * 8;
1431         as_in_fmt1_desc.bSubslotSize = p_ssize;
1432         as_in_fmt1_desc.bBitResolution = p_ssize * 8;
1433
1434         snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", p_srate);
1435         snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", c_srate);
1436
1437         res = usb_add_function(cfg, &agdev_g->func);
1438         if (res < 0)
1439                 kfree(agdev_g);
1440
1441         return res;
1442 }
1443
1444 static void
1445 uac2_unbind_config(struct usb_configuration *cfg)
1446 {
1447         kfree(agdev_g);
1448         agdev_g = NULL;
1449 }