drivers/usb/gadget/function/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 #include "u_uac2.h"
  24
  25 /* Keep everyone on toes */
  26 #define USB_XFERS       2
  27
  28 /*
  29  * The driver implements a simple UAC_2 topology.
  30  * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
  31  * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN
  32  * Capture and Playback sampling rates are independently
  33  *  controlled by two clock sources :
  34  *    CLK_5 := c_srate, and CLK_6 := p_srate
  35  */
  36 #define USB_OUT_IT_ID   1
  37 #define IO_IN_IT_ID     2
  38 #define IO_OUT_OT_ID    3
  39 #define USB_IN_OT_ID    4
  40 #define USB_OUT_CLK_ID  5
  41 #define USB_IN_CLK_ID   6
  42
  43 #define CONTROL_ABSENT  0
  44 #define CONTROL_RDONLY  1
  45 #define CONTROL_RDWR    3
  46
  47 #define CLK_FREQ_CTRL   0
  48 #define CLK_VLD_CTRL    2
  49
  50 #define COPY_CTRL       0
  51 #define CONN_CTRL       2
  52 #define OVRLD_CTRL      4
  53 #define CLSTR_CTRL      6
  54 #define UNFLW_CTRL      8
  55 #define OVFLW_CTRL      10
  56
  57 const char *uac2_name = "snd_uac2";
  58
  59 struct uac2_req {
  60         struct uac2_rtd_params *pp; /* parent param */
  61         struct usb_request *req;
  62 };
  63
  64 struct uac2_rtd_params {
  65         struct snd_uac2_chip *uac2; /* parent chip */
  66         bool ep_enabled; /* if the ep is enabled */
  67         /* Size of the ring buffer */
  68         size_t dma_bytes;
  69         unsigned char *dma_area;
  70
  71         struct snd_pcm_substream *ss;
  72
  73         /* Ring buffer */
  74         ssize_t hw_ptr;
  75
  76         void *rbuf;
  77
  78         size_t period_size;
  79
  80         unsigned max_psize;
  81         struct uac2_req ureq[USB_XFERS];
  82
  83         spinlock_t lock;
  84 };
  85
  86 struct snd_uac2_chip {
  87         struct platform_device pdev;
  88         struct platform_driver pdrv;
  89
  90         struct uac2_rtd_params p_prm;
  91         struct uac2_rtd_params c_prm;
  92
  93         struct snd_card *card;
  94         struct snd_pcm *pcm;
  95
  96         /* timekeeping for the playback endpoint */
  97         unsigned int p_interval;
  98         unsigned int p_residue;
  99
 100         /* pre-calculated values for playback iso completion */
 101         unsigned int p_pktsize;
 102         unsigned int p_pktsize_residue;
 103         unsigned int p_framesize;
 104 };
 105
 106 #define BUFF_SIZE_MAX   (PAGE_SIZE * 16)
 107 #define PRD_SIZE_MAX    PAGE_SIZE
 108 #define MIN_PERIODS     4
 109
 110 static struct snd_pcm_hardware uac2_pcm_hardware = {
 111         .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
 112                  | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
 113                  | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
 114         .rates = SNDRV_PCM_RATE_CONTINUOUS,
 115         .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
 116         .buffer_bytes_max = BUFF_SIZE_MAX,
 117         .period_bytes_max = PRD_SIZE_MAX,
 118         .periods_min = MIN_PERIODS,
 119 };
 120
 121 struct audio_dev {
 122         u8 ac_intf, ac_alt;
 123         u8 as_out_intf, as_out_alt;
 124         u8 as_in_intf, as_in_alt;
 125
 126         struct usb_ep *in_ep, *out_ep;
 127         struct usb_function func;
 128
 129         /* The ALSA Sound Card it represents on the USB-Client side */
 130         struct snd_uac2_chip uac2;
 131 };
 132
 133 static inline
 134 struct audio_dev *func_to_agdev(struct usb_function *f)
 135 {
 136         return container_of(f, struct audio_dev, func);
 137 }
 138
 139 static inline
 140 struct audio_dev *uac2_to_agdev(struct snd_uac2_chip *u)
 141 {
 142         return container_of(u, struct audio_dev, uac2);
 143 }
 144
 145 static inline
 146 struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
 147 {
 148         return container_of(p, struct snd_uac2_chip, pdev);
 149 }
 150
 151 static inline
 152 struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev)
 153 {
 154         return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
 155 }
 156
 157 static inline
 158 uint num_channels(uint chanmask)
 159 {
 160         uint num = 0;
 161
 162         while (chanmask) {
 163                 num += (chanmask & 1);
 164                 chanmask >>= 1;
 165         }
 166
 167         return num;
 168 }
 169
 170 static void
 171 agdev_iso_complete(struct usb_ep *ep, struct usb_request *req)
 172 {
 173         unsigned pending;
 174         unsigned long flags;
 175         unsigned int hw_ptr;
 176         bool update_alsa = false;
 177         int status = req->status;
 178         struct uac2_req *ur = req->context;
 179         struct snd_pcm_substream *substream;
 180         struct uac2_rtd_params *prm = ur->pp;
 181         struct snd_uac2_chip *uac2 = prm->uac2;
 182
 183         /* i/f shutting down */
 184         if (!prm->ep_enabled || req->status == -ESHUTDOWN)
 185                 return;
 186
 187         /*
 188          * We can't really do much about bad xfers.
 189          * Afterall, the ISOCH xfers could fail legitimately.
 190          */
 191         if (status)
 192                 pr_debug("%s: iso_complete status(%d) %d/%d\n",
 193                         __func__, status, req->actual, req->length);
 194
 195         substream = prm->ss;
 196
 197         /* Do nothing if ALSA isn't active */
 198         if (!substream)
 199                 goto exit;
 200
 201         spin_lock_irqsave(&prm->lock, flags);
 202
 203         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 204                 /*
 205                  * For each IN packet, take the quotient of the current data
 206                  * rate and the endpoint's interval as the base packet size.
 207                  * If there is a residue from this division, add it to the
 208                  * residue accumulator.
 209                  */
 210                 req->length = uac2->p_pktsize;
 211                 uac2->p_residue += uac2->p_pktsize_residue;
 212
 213                 /*
 214                  * Whenever there are more bytes in the accumulator than we
 215                  * need to add one more sample frame, increase this packet's
 216                  * size and decrease the accumulator.
 217                  */
 218                 if (uac2->p_residue / uac2->p_interval >= uac2->p_framesize) {
 219                         req->length += uac2->p_framesize;
 220                         uac2->p_residue -= uac2->p_framesize *
 221                                            uac2->p_interval;
 222                 }
 223
 224                 req->actual = req->length;
 225         }
 226
 227         pending = prm->hw_ptr % prm->period_size;
 228         pending += req->actual;
 229         if (pending >= prm->period_size)
 230                 update_alsa = true;
 231
 232         hw_ptr = prm->hw_ptr;
 233         prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
 234
 235         spin_unlock_irqrestore(&prm->lock, flags);
 236
 237         /* Pack USB load in ALSA ring buffer */
 238         pending = prm->dma_bytes - hw_ptr;
 239
 240         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 241                 if (unlikely(pending < req->actual)) {
 242                         memcpy(req->buf, prm->dma_area + hw_ptr, pending);
 243                         memcpy(req->buf + pending, prm->dma_area,
 244                                req->actual - pending);
 245                 } else {
 246                         memcpy(req->buf, prm->dma_area + hw_ptr, req->actual);
 247                 }
 248         } else {
 249                 if (unlikely(pending < req->actual)) {
 250                         memcpy(prm->dma_area + hw_ptr, req->buf, pending);
 251                         memcpy(prm->dma_area, req->buf + pending,
 252                                req->actual - pending);
 253                 } else {
 254                         memcpy(prm->dma_area + hw_ptr, req->buf, req->actual);
 255                 }
 256         }
 257
 258 exit:
 259         if (usb_ep_queue(ep, req, GFP_ATOMIC))
 260                 dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
 261
 262         if (update_alsa)
 263                 snd_pcm_period_elapsed(substream);
 264
 265         return;
 266 }
 267
 268 static int
 269 uac2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 270 {
 271         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 272         struct uac2_rtd_params *prm;
 273         unsigned long flags;
 274         int err = 0;
 275
 276         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 277                 prm = &uac2->p_prm;
 278         else
 279                 prm = &uac2->c_prm;
 280
 281         spin_lock_irqsave(&prm->lock, flags);
 282
 283         /* Reset */
 284         prm->hw_ptr = 0;
 285
 286         switch (cmd) {
 287         case SNDRV_PCM_TRIGGER_START:
 288         case SNDRV_PCM_TRIGGER_RESUME:
 289                 prm->ss = substream;
 290                 break;
 291         case SNDRV_PCM_TRIGGER_STOP:
 292         case SNDRV_PCM_TRIGGER_SUSPEND:
 293                 prm->ss = NULL;
 294                 break;
 295         default:
 296                 err = -EINVAL;
 297         }
 298
 299         spin_unlock_irqrestore(&prm->lock, flags);
 300
 301         /* Clear buffer after Play stops */
 302         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
 303                 memset(prm->rbuf, 0, prm->max_psize * USB_XFERS);
 304
 305         return err;
 306 }
 307
 308 static snd_pcm_uframes_t uac2_pcm_pointer(struct snd_pcm_substream *substream)
 309 {
 310         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 311         struct uac2_rtd_params *prm;
 312
 313         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 314                 prm = &uac2->p_prm;
 315         else
 316                 prm = &uac2->c_prm;
 317
 318         return bytes_to_frames(substream->runtime, prm->hw_ptr);
 319 }
 320
 321 static int uac2_pcm_hw_params(struct snd_pcm_substream *substream,
 322                                struct snd_pcm_hw_params *hw_params)
 323 {
 324         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 325         struct uac2_rtd_params *prm;
 326         int err;
 327
 328         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 329                 prm = &uac2->p_prm;
 330         else
 331                 prm = &uac2->c_prm;
 332
 333         err = snd_pcm_lib_malloc_pages(substream,
 334                                         params_buffer_bytes(hw_params));
 335         if (err >= 0) {
 336                 prm->dma_bytes = substream->runtime->dma_bytes;
 337                 prm->dma_area = substream->runtime->dma_area;
 338                 prm->period_size = params_period_bytes(hw_params);
 339         }
 340
 341         return err;
 342 }
 343
 344 static int uac2_pcm_hw_free(struct snd_pcm_substream *substream)
 345 {
 346         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 347         struct uac2_rtd_params *prm;
 348
 349         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 350                 prm = &uac2->p_prm;
 351         else
 352                 prm = &uac2->c_prm;
 353
 354         prm->dma_area = NULL;
 355         prm->dma_bytes = 0;
 356         prm->period_size = 0;
 357
 358         return snd_pcm_lib_free_pages(substream);
 359 }
 360
 361 static int uac2_pcm_open(struct snd_pcm_substream *substream)
 362 {
 363         struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 364         struct snd_pcm_runtime *runtime = substream->runtime;
 365         struct audio_dev *audio_dev;
 366         struct f_uac2_opts *opts;
 367         int p_ssize, c_ssize;
 368         int p_srate, c_srate;
 369         int p_chmask, c_chmask;
 370
 371         audio_dev = uac2_to_agdev(uac2);
 372         opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
 373         p_ssize = opts->p_ssize;
 374         c_ssize = opts->c_ssize;
 375         p_srate = opts->p_srate;
 376         c_srate = opts->c_srate;
 377         p_chmask = opts->p_chmask;
 378         c_chmask = opts->c_chmask;
 379         uac2->p_residue = 0;
 380
 381         runtime->hw = uac2_pcm_hardware;
 382
 383         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 384                 spin_lock_init(&uac2->p_prm.lock);
 385                 runtime->hw.rate_min = p_srate;
 386                 switch (p_ssize) {
 387                 case 3:
 388                         runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
 389                         break;
 390                 case 4:
 391                         runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
 392                         break;
 393                 default:
 394                         runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
 395                         break;
 396                 }
 397                 runtime->hw.channels_min = num_channels(p_chmask);
 398                 runtime->hw.period_bytes_min = 2 * uac2->p_prm.max_psize
 399                                                 / runtime->hw.periods_min;
 400         } else {
 401                 spin_lock_init(&uac2->c_prm.lock);
 402                 runtime->hw.rate_min = c_srate;
 403                 switch (c_ssize) {
 404                 case 3:
 405                         runtime->hw.formats = SNDRV_PCM_FMTBIT_S24_3LE;
 406                         break;
 407                 case 4:
 408                         runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
 409                         break;
 410                 default:
 411                         runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
 412                         break;
 413                 }
 414                 runtime->hw.channels_min = num_channels(c_chmask);
 415                 runtime->hw.period_bytes_min = 2 * uac2->c_prm.max_psize
 416                                                 / runtime->hw.periods_min;
 417         }
 418
 419         runtime->hw.rate_max = runtime->hw.rate_min;
 420         runtime->hw.channels_max = runtime->hw.channels_min;
 421
 422         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 423
 424         return 0;
 425 }
 426
 427 /* ALSA cries without these function pointers */
 428 static int uac2_pcm_null(struct snd_pcm_substream *substream)
 429 {
 430         return 0;
 431 }
 432
 433 static struct snd_pcm_ops uac2_pcm_ops = {
 434         .open = uac2_pcm_open,
 435         .close = uac2_pcm_null,
 436         .ioctl = snd_pcm_lib_ioctl,
 437         .hw_params = uac2_pcm_hw_params,
 438         .hw_free = uac2_pcm_hw_free,
 439         .trigger = uac2_pcm_trigger,
 440         .pointer = uac2_pcm_pointer,
 441         .prepare = uac2_pcm_null,
 442 };
 443
 444 static int snd_uac2_probe(struct platform_device *pdev)
 445 {
 446         struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev);
 447         struct snd_card *card;
 448         struct snd_pcm *pcm;
 449         struct audio_dev *audio_dev;
 450         struct f_uac2_opts *opts;
 451         int err;
 452         int p_chmask, c_chmask;
 453
 454         audio_dev = uac2_to_agdev(uac2);
 455         opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
 456         p_chmask = opts->p_chmask;
 457         c_chmask = opts->c_chmask;
 458
 459         /* Choose any slot, with no id */
 460         err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card);
 461         if (err < 0)
 462                 return err;
 463
 464         uac2->card = card;
 465
 466         /*
 467          * Create first PCM device
 468          * Create a substream only for non-zero channel streams
 469          */
 470         err = snd_pcm_new(uac2->card, "UAC2 PCM", 0,
 471                                p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
 472         if (err < 0)
 473                 goto snd_fail;
 474
 475         strcpy(pcm->name, "UAC2 PCM");
 476         pcm->private_data = uac2;
 477
 478         uac2->pcm = pcm;
 479
 480         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac2_pcm_ops);
 481         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac2_pcm_ops);
 482
 483         strcpy(card->driver, "UAC2_Gadget");
 484         strcpy(card->shortname, "UAC2_Gadget");
 485         sprintf(card->longname, "UAC2_Gadget %i", pdev->id);
 486
 487         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 488                 snd_dma_continuous_data(GFP_KERNEL), 0, BUFF_SIZE_MAX);
 489
 490         err = snd_card_register(card);
 491         if (!err) {
 492                 platform_set_drvdata(pdev, card);
 493                 return 0;
 494         }
 495
 496 snd_fail:
 497         snd_card_free(card);
 498
 499         uac2->pcm = NULL;
 500         uac2->card = NULL;
 501
 502         return err;
 503 }
 504
 505 static int snd_uac2_remove(struct platform_device *pdev)
 506 {
 507         struct snd_card *card = platform_get_drvdata(pdev);
 508
 509         if (card)
 510                 return snd_card_free(card);
 511
 512         return 0;
 513 }
 514
 515 static int alsa_uac2_init(struct audio_dev *agdev)
 516 {
 517         struct snd_uac2_chip *uac2 = &agdev->uac2;
 518         int err;
 519
 520         uac2->pdrv.probe = snd_uac2_probe;
 521         uac2->pdrv.remove = snd_uac2_remove;
 522         uac2->pdrv.driver.name = uac2_name;
 523
 524         uac2->pdev.id = 0;
 525         uac2->pdev.name = uac2_name;
 526
 527         /* Register snd_uac2 driver */
 528         err = platform_driver_register(&uac2->pdrv);
 529         if (err)
 530                 return err;
 531
 532         /* Register snd_uac2 device */
 533         err = platform_device_register(&uac2->pdev);
 534         if (err)
 535                 platform_driver_unregister(&uac2->pdrv);
 536
 537         return err;
 538 }
 539
 540 static void alsa_uac2_exit(struct audio_dev *agdev)
 541 {
 542         struct snd_uac2_chip *uac2 = &agdev->uac2;
 543
 544         platform_driver_unregister(&uac2->pdrv);
 545         platform_device_unregister(&uac2->pdev);
 546 }
 547
 548
 549 /* --------- USB Function Interface ------------- */
 550
 551 enum {
 552         STR_ASSOC,
 553         STR_IF_CTRL,
 554         STR_CLKSRC_IN,
 555         STR_CLKSRC_OUT,
 556         STR_USB_IT,
 557         STR_IO_IT,
 558         STR_USB_OT,
 559         STR_IO_OT,
 560         STR_AS_OUT_ALT0,
 561         STR_AS_OUT_ALT1,
 562         STR_AS_IN_ALT0,
 563         STR_AS_IN_ALT1,
 564 };
 565
 566 static char clksrc_in[8];
 567 static char clksrc_out[8];
 568
 569 static struct usb_string strings_fn[] = {
 570         [STR_ASSOC].s = "Source/Sink",
 571         [STR_IF_CTRL].s = "Topology Control",
 572         [STR_CLKSRC_IN].s = clksrc_in,
 573         [STR_CLKSRC_OUT].s = clksrc_out,
 574         [STR_USB_IT].s = "USBH Out",
 575         [STR_IO_IT].s = "USBD Out",
 576         [STR_USB_OT].s = "USBH In",
 577         [STR_IO_OT].s = "USBD In",
 578         [STR_AS_OUT_ALT0].s = "Playback Inactive",
 579         [STR_AS_OUT_ALT1].s = "Playback Active",
 580         [STR_AS_IN_ALT0].s = "Capture Inactive",
 581         [STR_AS_IN_ALT1].s = "Capture Active",
 582         { },
 583 };
 584
 585 static struct usb_gadget_strings str_fn = {
 586         .language = 0x0409,     /* en-us */
 587         .strings = strings_fn,
 588 };
 589
 590 static struct usb_gadget_strings *fn_strings[] = {
 591         &str_fn,
 592         NULL,
 593 };
 594
 595 static struct usb_qualifier_descriptor devqual_desc = {
 596         .bLength = sizeof devqual_desc,
 597         .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
 598
 599         .bcdUSB = cpu_to_le16(0x200),
 600         .bDeviceClass = USB_CLASS_MISC,
 601         .bDeviceSubClass = 0x02,
 602         .bDeviceProtocol = 0x01,
 603         .bNumConfigurations = 1,
 604         .bRESERVED = 0,
 605 };
 606
 607 static struct usb_interface_assoc_descriptor iad_desc = {
 608         .bLength = sizeof iad_desc,
 609         .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
 610
 611         .bFirstInterface = 0,
 612         .bInterfaceCount = 3,
 613         .bFunctionClass = USB_CLASS_AUDIO,
 614         .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
 615         .bFunctionProtocol = UAC_VERSION_2,
 616 };
 617
 618 /* Audio Control Interface */
 619 static struct usb_interface_descriptor std_ac_if_desc = {
 620         .bLength = sizeof std_ac_if_desc,
 621         .bDescriptorType = USB_DT_INTERFACE,
 622
 623         .bAlternateSetting = 0,
 624         .bNumEndpoints = 0,
 625         .bInterfaceClass = USB_CLASS_AUDIO,
 626         .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
 627         .bInterfaceProtocol = UAC_VERSION_2,
 628 };
 629
 630 /* Clock source for IN traffic */
 631 struct uac_clock_source_descriptor in_clk_src_desc = {
 632         .bLength = sizeof in_clk_src_desc,
 633         .bDescriptorType = USB_DT_CS_INTERFACE,
 634
 635         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 636         .bClockID = USB_IN_CLK_ID,
 637         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 638         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 639         .bAssocTerminal = 0,
 640 };
 641
 642 /* Clock source for OUT traffic */
 643 struct uac_clock_source_descriptor out_clk_src_desc = {
 644         .bLength = sizeof out_clk_src_desc,
 645         .bDescriptorType = USB_DT_CS_INTERFACE,
 646
 647         .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
 648         .bClockID = USB_OUT_CLK_ID,
 649         .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
 650         .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
 651         .bAssocTerminal = 0,
 652 };
 653
 654 /* Input Terminal for USB_OUT */
 655 struct uac2_input_terminal_descriptor usb_out_it_desc = {
 656         .bLength = sizeof usb_out_it_desc,
 657         .bDescriptorType = USB_DT_CS_INTERFACE,
 658
 659         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 660         .bTerminalID = USB_OUT_IT_ID,
 661         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 662         .bAssocTerminal = 0,
 663         .bCSourceID = USB_OUT_CLK_ID,
 664         .iChannelNames = 0,
 665         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 666 };
 667
 668 /* Input Terminal for I/O-In */
 669 struct uac2_input_terminal_descriptor io_in_it_desc = {
 670         .bLength = sizeof io_in_it_desc,
 671         .bDescriptorType = USB_DT_CS_INTERFACE,
 672
 673         .bDescriptorSubtype = UAC_INPUT_TERMINAL,
 674         .bTerminalID = IO_IN_IT_ID,
 675         .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
 676         .bAssocTerminal = 0,
 677         .bCSourceID = USB_IN_CLK_ID,
 678         .iChannelNames = 0,
 679         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 680 };
 681
 682 /* Ouput Terminal for USB_IN */
 683 struct uac2_output_terminal_descriptor usb_in_ot_desc = {
 684         .bLength = sizeof usb_in_ot_desc,
 685         .bDescriptorType = USB_DT_CS_INTERFACE,
 686
 687         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 688         .bTerminalID = USB_IN_OT_ID,
 689         .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
 690         .bAssocTerminal = 0,
 691         .bSourceID = IO_IN_IT_ID,
 692         .bCSourceID = USB_IN_CLK_ID,
 693         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 694 };
 695
 696 /* Ouput Terminal for I/O-Out */
 697 struct uac2_output_terminal_descriptor io_out_ot_desc = {
 698         .bLength = sizeof io_out_ot_desc,
 699         .bDescriptorType = USB_DT_CS_INTERFACE,
 700
 701         .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
 702         .bTerminalID = IO_OUT_OT_ID,
 703         .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
 704         .bAssocTerminal = 0,
 705         .bSourceID = USB_OUT_IT_ID,
 706         .bCSourceID = USB_OUT_CLK_ID,
 707         .bmControls = (CONTROL_RDWR << COPY_CTRL),
 708 };
 709
 710 struct uac2_ac_header_descriptor ac_hdr_desc = {
 711         .bLength = sizeof ac_hdr_desc,
 712         .bDescriptorType = USB_DT_CS_INTERFACE,
 713
 714         .bDescriptorSubtype = UAC_MS_HEADER,
 715         .bcdADC = cpu_to_le16(0x200),
 716         .bCategory = UAC2_FUNCTION_IO_BOX,
 717         .wTotalLength = sizeof in_clk_src_desc + sizeof out_clk_src_desc
 718                          + sizeof usb_out_it_desc + sizeof io_in_it_desc
 719                         + sizeof usb_in_ot_desc + sizeof io_out_ot_desc,
 720         .bmControls = 0,
 721 };
 722
 723 /* Audio Streaming OUT Interface - Alt0 */
 724 static struct usb_interface_descriptor std_as_out_if0_desc = {
 725         .bLength = sizeof std_as_out_if0_desc,
 726         .bDescriptorType = USB_DT_INTERFACE,
 727
 728         .bAlternateSetting = 0,
 729         .bNumEndpoints = 0,
 730         .bInterfaceClass = USB_CLASS_AUDIO,
 731         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 732         .bInterfaceProtocol = UAC_VERSION_2,
 733 };
 734
 735 /* Audio Streaming OUT Interface - Alt1 */
 736 static struct usb_interface_descriptor std_as_out_if1_desc = {
 737         .bLength = sizeof std_as_out_if1_desc,
 738         .bDescriptorType = USB_DT_INTERFACE,
 739
 740         .bAlternateSetting = 1,
 741         .bNumEndpoints = 1,
 742         .bInterfaceClass = USB_CLASS_AUDIO,
 743         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 744         .bInterfaceProtocol = UAC_VERSION_2,
 745 };
 746
 747 /* Audio Stream OUT Intface Desc */
 748 struct uac2_as_header_descriptor as_out_hdr_desc = {
 749         .bLength = sizeof as_out_hdr_desc,
 750         .bDescriptorType = USB_DT_CS_INTERFACE,
 751
 752         .bDescriptorSubtype = UAC_AS_GENERAL,
 753         .bTerminalLink = USB_OUT_IT_ID,
 754         .bmControls = 0,
 755         .bFormatType = UAC_FORMAT_TYPE_I,
 756         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 757         .iChannelNames = 0,
 758 };
 759
 760 /* Audio USB_OUT Format */
 761 struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
 762         .bLength = sizeof as_out_fmt1_desc,
 763         .bDescriptorType = USB_DT_CS_INTERFACE,
 764         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 765         .bFormatType = UAC_FORMAT_TYPE_I,
 766 };
 767
 768 /* STD AS ISO OUT Endpoint */
 769 struct usb_endpoint_descriptor fs_epout_desc = {
 770         .bLength = USB_DT_ENDPOINT_SIZE,
 771         .bDescriptorType = USB_DT_ENDPOINT,
 772
 773         .bEndpointAddress = USB_DIR_OUT,
 774         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 775         .bInterval = 1,
 776 };
 777
 778 struct usb_endpoint_descriptor hs_epout_desc = {
 779         .bLength = USB_DT_ENDPOINT_SIZE,
 780         .bDescriptorType = USB_DT_ENDPOINT,
 781
 782         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 783         .bInterval = 4,
 784 };
 785
 786 /* CS AS ISO OUT Endpoint */
 787 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
 788         .bLength = sizeof as_iso_out_desc,
 789         .bDescriptorType = USB_DT_CS_ENDPOINT,
 790
 791         .bDescriptorSubtype = UAC_EP_GENERAL,
 792         .bmAttributes = 0,
 793         .bmControls = 0,
 794         .bLockDelayUnits = 0,
 795         .wLockDelay = 0,
 796 };
 797
 798 /* Audio Streaming IN Interface - Alt0 */
 799 static struct usb_interface_descriptor std_as_in_if0_desc = {
 800         .bLength = sizeof std_as_in_if0_desc,
 801         .bDescriptorType = USB_DT_INTERFACE,
 802
 803         .bAlternateSetting = 0,
 804         .bNumEndpoints = 0,
 805         .bInterfaceClass = USB_CLASS_AUDIO,
 806         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 807         .bInterfaceProtocol = UAC_VERSION_2,
 808 };
 809
 810 /* Audio Streaming IN Interface - Alt1 */
 811 static struct usb_interface_descriptor std_as_in_if1_desc = {
 812         .bLength = sizeof std_as_in_if1_desc,
 813         .bDescriptorType = USB_DT_INTERFACE,
 814
 815         .bAlternateSetting = 1,
 816         .bNumEndpoints = 1,
 817         .bInterfaceClass = USB_CLASS_AUDIO,
 818         .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
 819         .bInterfaceProtocol = UAC_VERSION_2,
 820 };
 821
 822 /* Audio Stream IN Intface Desc */
 823 struct uac2_as_header_descriptor as_in_hdr_desc = {
 824         .bLength = sizeof as_in_hdr_desc,
 825         .bDescriptorType = USB_DT_CS_INTERFACE,
 826
 827         .bDescriptorSubtype = UAC_AS_GENERAL,
 828         .bTerminalLink = USB_IN_OT_ID,
 829         .bmControls = 0,
 830         .bFormatType = UAC_FORMAT_TYPE_I,
 831         .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
 832         .iChannelNames = 0,
 833 };
 834
 835 /* Audio USB_IN Format */
 836 struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
 837         .bLength = sizeof as_in_fmt1_desc,
 838         .bDescriptorType = USB_DT_CS_INTERFACE,
 839         .bDescriptorSubtype = UAC_FORMAT_TYPE,
 840         .bFormatType = UAC_FORMAT_TYPE_I,
 841 };
 842
 843 /* STD AS ISO IN Endpoint */
 844 struct usb_endpoint_descriptor fs_epin_desc = {
 845         .bLength = USB_DT_ENDPOINT_SIZE,
 846         .bDescriptorType = USB_DT_ENDPOINT,
 847
 848         .bEndpointAddress = USB_DIR_IN,
 849         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 850         .bInterval = 1,
 851 };
 852
 853 struct usb_endpoint_descriptor hs_epin_desc = {
 854         .bLength = USB_DT_ENDPOINT_SIZE,
 855         .bDescriptorType = USB_DT_ENDPOINT,
 856
 857         .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
 858         .bInterval = 4,
 859 };
 860
 861 /* CS AS ISO IN Endpoint */
 862 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
 863         .bLength = sizeof as_iso_in_desc,
 864         .bDescriptorType = USB_DT_CS_ENDPOINT,
 865
 866         .bDescriptorSubtype = UAC_EP_GENERAL,
 867         .bmAttributes = 0,
 868         .bmControls = 0,
 869         .bLockDelayUnits = 0,
 870         .wLockDelay = 0,
 871 };
 872
 873 static struct usb_descriptor_header *fs_audio_desc[] = {
 874         (struct usb_descriptor_header *)&iad_desc,
 875         (struct usb_descriptor_header *)&std_ac_if_desc,
 876
 877         (struct usb_descriptor_header *)&ac_hdr_desc,
 878         (struct usb_descriptor_header *)&in_clk_src_desc,
 879         (struct usb_descriptor_header *)&out_clk_src_desc,
 880         (struct usb_descriptor_header *)&usb_out_it_desc,
 881         (struct usb_descriptor_header *)&io_in_it_desc,
 882         (struct usb_descriptor_header *)&usb_in_ot_desc,
 883         (struct usb_descriptor_header *)&io_out_ot_desc,
 884
 885         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 886         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 887
 888         (struct usb_descriptor_header *)&as_out_hdr_desc,
 889         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 890         (struct usb_descriptor_header *)&fs_epout_desc,
 891         (struct usb_descriptor_header *)&as_iso_out_desc,
 892
 893         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 894         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 895
 896         (struct usb_descriptor_header *)&as_in_hdr_desc,
 897         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 898         (struct usb_descriptor_header *)&fs_epin_desc,
 899         (struct usb_descriptor_header *)&as_iso_in_desc,
 900         NULL,
 901 };
 902
 903 static struct usb_descriptor_header *hs_audio_desc[] = {
 904         (struct usb_descriptor_header *)&iad_desc,
 905         (struct usb_descriptor_header *)&std_ac_if_desc,
 906
 907         (struct usb_descriptor_header *)&ac_hdr_desc,
 908         (struct usb_descriptor_header *)&in_clk_src_desc,
 909         (struct usb_descriptor_header *)&out_clk_src_desc,
 910         (struct usb_descriptor_header *)&usb_out_it_desc,
 911         (struct usb_descriptor_header *)&io_in_it_desc,
 912         (struct usb_descriptor_header *)&usb_in_ot_desc,
 913         (struct usb_descriptor_header *)&io_out_ot_desc,
 914
 915         (struct usb_descriptor_header *)&std_as_out_if0_desc,
 916         (struct usb_descriptor_header *)&std_as_out_if1_desc,
 917
 918         (struct usb_descriptor_header *)&as_out_hdr_desc,
 919         (struct usb_descriptor_header *)&as_out_fmt1_desc,
 920         (struct usb_descriptor_header *)&hs_epout_desc,
 921         (struct usb_descriptor_header *)&as_iso_out_desc,
 922
 923         (struct usb_descriptor_header *)&std_as_in_if0_desc,
 924         (struct usb_descriptor_header *)&std_as_in_if1_desc,
 925
 926         (struct usb_descriptor_header *)&as_in_hdr_desc,
 927         (struct usb_descriptor_header *)&as_in_fmt1_desc,
 928         (struct usb_descriptor_header *)&hs_epin_desc,
 929         (struct usb_descriptor_header *)&as_iso_in_desc,
 930         NULL,
 931 };
 932
 933 struct cntrl_cur_lay3 {
 934         __u32   dCUR;
 935 };
 936
 937 struct cntrl_range_lay3 {
 938         __u16   wNumSubRanges;
 939         __u32   dMIN;
 940         __u32   dMAX;
 941         __u32   dRES;
 942 } __packed;
 943
 944 static inline void
 945 free_ep(struct uac2_rtd_params *prm, struct usb_ep *ep)
 946 {
 947         struct snd_uac2_chip *uac2 = prm->uac2;
 948         int i;
 949
 950         prm->ep_enabled = false;
 951
 952         for (i = 0; i < USB_XFERS; i++) {
 953                 if (prm->ureq[i].req) {
 954                         usb_ep_dequeue(ep, prm->ureq[i].req);
 955                         usb_ep_free_request(ep, prm->ureq[i].req);
 956                         prm->ureq[i].req = NULL;
 957                 }
 958         }
 959
 960         if (usb_ep_disable(ep))
 961                 dev_err(&uac2->pdev.dev,
 962                         "%s:%d Error!\n", __func__, __LINE__);
 963 }
 964
 965 static int
 966 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 967 {
 968         struct audio_dev *agdev = func_to_agdev(fn);
 969         struct snd_uac2_chip *uac2 = &agdev->uac2;
 970         struct usb_composite_dev *cdev = cfg->cdev;
 971         struct usb_gadget *gadget = cdev->gadget;
 972         struct device *dev = &uac2->pdev.dev;
 973         struct uac2_rtd_params *prm;
 974         struct f_uac2_opts *uac2_opts;
 975         struct usb_string *us;
 976         int ret;
 977
 978         uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst);
 979
 980         us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
 981         if (IS_ERR(us))
 982                 return PTR_ERR(us);
 983         iad_desc.iFunction = us[STR_ASSOC].id;
 984         std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
 985         in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
 986         out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
 987         usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
 988         io_in_it_desc.iTerminal = us[STR_IO_IT].id;
 989         usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
 990         io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
 991         std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
 992         std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
 993         std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
 994         std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
 995
 996
 997         /* Initialize the configurable parameters */
 998         usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
 999         usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1000         io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1001         io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1002         as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
1003         as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
1004         as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
1005         as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
1006         as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
1007         as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
1008         as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
1009         as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
1010
1011         snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
1012         snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
1013
1014         ret = usb_interface_id(cfg, fn);
1015         if (ret < 0) {
1016                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1017                 return ret;
1018         }
1019         std_ac_if_desc.bInterfaceNumber = ret;
1020         agdev->ac_intf = ret;
1021         agdev->ac_alt = 0;
1022
1023         ret = usb_interface_id(cfg, fn);
1024         if (ret < 0) {
1025                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1026                 return ret;
1027         }
1028         std_as_out_if0_desc.bInterfaceNumber = ret;
1029         std_as_out_if1_desc.bInterfaceNumber = ret;
1030         agdev->as_out_intf = ret;
1031         agdev->as_out_alt = 0;
1032
1033         ret = usb_interface_id(cfg, fn);
1034         if (ret < 0) {
1035                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1036                 return ret;
1037         }
1038         std_as_in_if0_desc.bInterfaceNumber = ret;
1039         std_as_in_if1_desc.bInterfaceNumber = ret;
1040         agdev->as_in_intf = ret;
1041         agdev->as_in_alt = 0;
1042
1043         agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
1044         if (!agdev->out_ep) {
1045                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1046                 goto err;
1047         }
1048         agdev->out_ep->driver_data = agdev;
1049
1050         agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
1051         if (!agdev->in_ep) {
1052                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1053                 goto err;
1054         }
1055         agdev->in_ep->driver_data = agdev;
1056
1057         uac2->p_prm.uac2 = uac2;
1058         uac2->c_prm.uac2 = uac2;
1059
1060         hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
1061         hs_epout_desc.wMaxPacketSize = fs_epout_desc.wMaxPacketSize;
1062         hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
1063         hs_epin_desc.wMaxPacketSize = fs_epin_desc.wMaxPacketSize;
1064
1065         ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL);
1066         if (ret)
1067                 goto err;
1068
1069         prm = &agdev->uac2.c_prm;
1070         prm->max_psize = hs_epout_desc.wMaxPacketSize;
1071         prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1072         if (!prm->rbuf) {
1073                 prm->max_psize = 0;
1074                 goto err;
1075         }
1076
1077         prm = &agdev->uac2.p_prm;
1078         prm->max_psize = hs_epin_desc.wMaxPacketSize;
1079         prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
1080         if (!prm->rbuf) {
1081                 prm->max_psize = 0;
1082                 goto err;
1083         }
1084
1085         ret = alsa_uac2_init(agdev);
1086         if (ret)
1087                 goto err;
1088         return 0;
1089 err:
1090         kfree(agdev->uac2.p_prm.rbuf);
1091         kfree(agdev->uac2.c_prm.rbuf);
1092         usb_free_all_descriptors(fn);
1093         if (agdev->in_ep)
1094                 agdev->in_ep->driver_data = NULL;
1095         if (agdev->out_ep)
1096                 agdev->out_ep->driver_data = NULL;
1097         return -EINVAL;
1098 }
1099
1100 static int
1101 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
1102 {
1103         struct usb_composite_dev *cdev = fn->config->cdev;
1104         struct audio_dev *agdev = func_to_agdev(fn);
1105         struct snd_uac2_chip *uac2 = &agdev->uac2;
1106         struct usb_gadget *gadget = cdev->gadget;
1107         struct device *dev = &uac2->pdev.dev;
1108         struct usb_request *req;
1109         struct usb_ep *ep;
1110         struct uac2_rtd_params *prm;
1111         int req_len, i;
1112
1113         /* No i/f has more than 2 alt settings */
1114         if (alt > 1) {
1115                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1116                 return -EINVAL;
1117         }
1118
1119         if (intf == agdev->ac_intf) {
1120                 /* Control I/f has only 1 AltSetting - 0 */
1121                 if (alt) {
1122                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1123                         return -EINVAL;
1124                 }
1125                 return 0;
1126         }
1127
1128         if (intf == agdev->as_out_intf) {
1129                 ep = agdev->out_ep;
1130                 prm = &uac2->c_prm;
1131                 config_ep_by_speed(gadget, fn, ep);
1132                 agdev->as_out_alt = alt;
1133                 req_len = prm->max_psize;
1134         } else if (intf == agdev->as_in_intf) {
1135                 struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev);
1136                 unsigned int factor, rate;
1137                 struct usb_endpoint_descriptor *ep_desc;
1138
1139                 ep = agdev->in_ep;
1140                 prm = &uac2->p_prm;
1141                 config_ep_by_speed(gadget, fn, ep);
1142                 agdev->as_in_alt = alt;
1143
1144                 /* pre-calculate the playback endpoint's interval */
1145                 if (gadget->speed == USB_SPEED_FULL) {
1146                         ep_desc = &fs_epin_desc;
1147                         factor = 1000;
1148                 } else {
1149                         ep_desc = &hs_epin_desc;
1150                         factor = 125;
1151                 }
1152
1153                 /* pre-compute some values for iso_complete() */
1154                 uac2->p_framesize = opts->p_ssize *
1155                                     num_channels(opts->p_chmask);
1156                 rate = opts->p_srate * uac2->p_framesize;
1157                 uac2->p_interval = (1 << (ep_desc->bInterval - 1)) * factor;
1158                 uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
1159                                         prm->max_psize);
1160
1161                 if (uac2->p_pktsize < prm->max_psize)
1162                         uac2->p_pktsize_residue = rate % uac2->p_interval;
1163                 else
1164                         uac2->p_pktsize_residue = 0;
1165
1166                 req_len = uac2->p_pktsize;
1167                 uac2->p_residue = 0;
1168         } else {
1169                 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1170                 return -EINVAL;
1171         }
1172
1173         if (alt == 0) {
1174                 free_ep(prm, ep);
1175                 return 0;
1176         }
1177
1178         prm->ep_enabled = true;
1179         usb_ep_enable(ep);
1180
1181         for (i = 0; i < USB_XFERS; i++) {
1182                 if (!prm->ureq[i].req) {
1183                         req = usb_ep_alloc_request(ep, GFP_ATOMIC);
1184                         if (req == NULL)
1185                                 return -ENOMEM;
1186
1187                         prm->ureq[i].req = req;
1188                         prm->ureq[i].pp = prm;
1189
1190                         req->zero = 0;
1191                         req->context = &prm->ureq[i];
1192                         req->length = req_len;
1193                         req->complete = agdev_iso_complete;
1194                         req->buf = prm->rbuf + i * prm->max_psize;
1195                 }
1196
1197                 if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
1198                         dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
1199         }
1200
1201         return 0;
1202 }
1203
1204 static int
1205 afunc_get_alt(struct usb_function *fn, unsigned intf)
1206 {
1207         struct audio_dev *agdev = func_to_agdev(fn);
1208         struct snd_uac2_chip *uac2 = &agdev->uac2;
1209
1210         if (intf == agdev->ac_intf)
1211                 return agdev->ac_alt;
1212         else if (intf == agdev->as_out_intf)
1213                 return agdev->as_out_alt;
1214         else if (intf == agdev->as_in_intf)
1215                 return agdev->as_in_alt;
1216         else
1217                 dev_err(&uac2->pdev.dev,
1218                         "%s:%d Invalid Interface %d!\n",
1219                         __func__, __LINE__, intf);
1220
1221         return -EINVAL;
1222 }
1223
1224 static void
1225 afunc_disable(struct usb_function *fn)
1226 {
1227         struct audio_dev *agdev = func_to_agdev(fn);
1228         struct snd_uac2_chip *uac2 = &agdev->uac2;
1229
1230         free_ep(&uac2->p_prm, agdev->in_ep);
1231         agdev->as_in_alt = 0;
1232
1233         free_ep(&uac2->c_prm, agdev->out_ep);
1234         agdev->as_out_alt = 0;
1235 }
1236
1237 static int
1238 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1239 {
1240         struct usb_request *req = fn->config->cdev->req;
1241         struct audio_dev *agdev = func_to_agdev(fn);
1242         struct snd_uac2_chip *uac2 = &agdev->uac2;
1243         struct f_uac2_opts *opts;
1244         u16 w_length = le16_to_cpu(cr->wLength);
1245         u16 w_index = le16_to_cpu(cr->wIndex);
1246         u16 w_value = le16_to_cpu(cr->wValue);
1247         u8 entity_id = (w_index >> 8) & 0xff;
1248         u8 control_selector = w_value >> 8;
1249         int value = -EOPNOTSUPP;
1250         int p_srate, c_srate;
1251
1252         opts = agdev_to_uac2_opts(agdev);
1253         p_srate = opts->p_srate;
1254         c_srate = opts->c_srate;
1255
1256         if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1257                 struct cntrl_cur_lay3 c;
1258
1259                 if (entity_id == USB_IN_CLK_ID)
1260                         c.dCUR = p_srate;
1261                 else if (entity_id == USB_OUT_CLK_ID)
1262                         c.dCUR = c_srate;
1263
1264                 value = min_t(unsigned, w_length, sizeof c);
1265                 memcpy(req->buf, &c, value);
1266         } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
1267                 *(u8 *)req->buf = 1;
1268                 value = min_t(unsigned, w_length, 1);
1269         } else {
1270                 dev_err(&uac2->pdev.dev,
1271                         "%s:%d control_selector=%d TODO!\n",
1272                         __func__, __LINE__, control_selector);
1273         }
1274
1275         return value;
1276 }
1277
1278 static int
1279 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1280 {
1281         struct usb_request *req = fn->config->cdev->req;
1282         struct audio_dev *agdev = func_to_agdev(fn);
1283         struct snd_uac2_chip *uac2 = &agdev->uac2;
1284         struct f_uac2_opts *opts;
1285         u16 w_length = le16_to_cpu(cr->wLength);
1286         u16 w_index = le16_to_cpu(cr->wIndex);
1287         u16 w_value = le16_to_cpu(cr->wValue);
1288         u8 entity_id = (w_index >> 8) & 0xff;
1289         u8 control_selector = w_value >> 8;
1290         struct cntrl_range_lay3 r;
1291         int value = -EOPNOTSUPP;
1292         int p_srate, c_srate;
1293
1294         opts = agdev_to_uac2_opts(agdev);
1295         p_srate = opts->p_srate;
1296         c_srate = opts->c_srate;
1297
1298         if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
1299                 if (entity_id == USB_IN_CLK_ID)
1300                         r.dMIN = p_srate;
1301                 else if (entity_id == USB_OUT_CLK_ID)
1302                         r.dMIN = c_srate;
1303                 else
1304                         return -EOPNOTSUPP;
1305
1306                 r.dMAX = r.dMIN;
1307                 r.dRES = 0;
1308                 r.wNumSubRanges = 1;
1309
1310                 value = min_t(unsigned, w_length, sizeof r);
1311                 memcpy(req->buf, &r, value);
1312         } else {
1313                 dev_err(&uac2->pdev.dev,
1314                         "%s:%d control_selector=%d TODO!\n",
1315                         __func__, __LINE__, control_selector);
1316         }
1317
1318         return value;
1319 }
1320
1321 static int
1322 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1323 {
1324         if (cr->bRequest == UAC2_CS_CUR)
1325                 return in_rq_cur(fn, cr);
1326         else if (cr->bRequest == UAC2_CS_RANGE)
1327                 return in_rq_range(fn, cr);
1328         else
1329                 return -EOPNOTSUPP;
1330 }
1331
1332 static int
1333 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1334 {
1335         u16 w_length = le16_to_cpu(cr->wLength);
1336         u16 w_value = le16_to_cpu(cr->wValue);
1337         u8 control_selector = w_value >> 8;
1338
1339         if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
1340                 return w_length;
1341
1342         return -EOPNOTSUPP;
1343 }
1344
1345 static int
1346 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1347 {
1348         struct audio_dev *agdev = func_to_agdev(fn);
1349         struct snd_uac2_chip *uac2 = &agdev->uac2;
1350         u16 w_index = le16_to_cpu(cr->wIndex);
1351         u8 intf = w_index & 0xff;
1352
1353         if (intf != agdev->ac_intf) {
1354                 dev_err(&uac2->pdev.dev,
1355                         "%s:%d Error!\n", __func__, __LINE__);
1356                 return -EOPNOTSUPP;
1357         }
1358
1359         if (cr->bRequestType & USB_DIR_IN)
1360                 return ac_rq_in(fn, cr);
1361         else if (cr->bRequest == UAC2_CS_CUR)
1362                 return out_rq_cur(fn, cr);
1363
1364         return -EOPNOTSUPP;
1365 }
1366
1367 static int
1368 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
1369 {
1370         struct usb_composite_dev *cdev = fn->config->cdev;
1371         struct audio_dev *agdev = func_to_agdev(fn);
1372         struct snd_uac2_chip *uac2 = &agdev->uac2;
1373         struct usb_request *req = cdev->req;
1374         u16 w_length = le16_to_cpu(cr->wLength);
1375         int value = -EOPNOTSUPP;
1376
1377         /* Only Class specific requests are supposed to reach here */
1378         if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
1379                 return -EOPNOTSUPP;
1380
1381         if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
1382                 value = setup_rq_inf(fn, cr);
1383         else
1384                 dev_err(&uac2->pdev.dev, "%s:%d Error!\n", __func__, __LINE__);
1385
1386         if (value >= 0) {
1387                 req->length = value;
1388                 req->zero = value < w_length;
1389                 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1390                 if (value < 0) {
1391                         dev_err(&uac2->pdev.dev,
1392                                 "%s:%d Error!\n", __func__, __LINE__);
1393                         req->status = 0;
1394                 }
1395         }
1396
1397         return value;
1398 }
1399
1400 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
1401 {
1402         return container_of(to_config_group(item), struct f_uac2_opts,
1403                             func_inst.group);
1404 }
1405
1406 CONFIGFS_ATTR_STRUCT(f_uac2_opts);
1407 CONFIGFS_ATTR_OPS(f_uac2_opts);
1408
1409 static void f_uac2_attr_release(struct config_item *item)
1410 {
1411         struct f_uac2_opts *opts = to_f_uac2_opts(item);
1412
1413         usb_put_function_instance(&opts->func_inst);
1414 }
1415
1416 static struct configfs_item_operations f_uac2_item_ops = {
1417         .release        = f_uac2_attr_release,
1418         .show_attribute = f_uac2_opts_attr_show,
1419         .store_attribute = f_uac2_opts_attr_store,
1420 };
1421
1422 #define UAC2_ATTRIBUTE(name)                                            \
1423 static ssize_t f_uac2_opts_##name##_show(struct f_uac2_opts *opts,      \
1424                                          char *page)                    \
1425 {                                                                       \
1426         int result;                                                     \
1427                                                                         \
1428         mutex_lock(&opts->lock);                                        \
1429         result = sprintf(page, "%u\n", opts->name);                     \
1430         mutex_unlock(&opts->lock);                                      \
1431                                                                         \
1432         return result;                                                  \
1433 }                                                                       \
1434                                                                         \
1435 static ssize_t f_uac2_opts_##name##_store(struct f_uac2_opts *opts,     \
1436                                           const char *page, size_t len) \
1437 {                                                                       \
1438         int ret;                                                        \
1439         u32 num;                                                        \
1440                                                                         \
1441         mutex_lock(&opts->lock);                                        \
1442         if (opts->refcnt) {                                             \
1443                 ret = -EBUSY;                                           \
1444                 goto end;                                               \
1445         }                                                               \
1446                                                                         \
1447         ret = kstrtou32(page, 0, &num);                                 \
1448         if (ret)                                                        \
1449                 goto end;                                               \
1450                                                                         \
1451         opts->name = num;                                               \
1452         ret = len;                                                      \
1453                                                                         \
1454 end:                                                                    \
1455         mutex_unlock(&opts->lock);                                      \
1456         return ret;                                                     \
1457 }                                                                       \
1458                                                                         \
1459 static struct f_uac2_opts_attribute f_uac2_opts_##name =                \
1460         __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR,                        \
1461                         f_uac2_opts_##name##_show,                      \
1462                         f_uac2_opts_##name##_store)
1463
1464 UAC2_ATTRIBUTE(p_chmask);
1465 UAC2_ATTRIBUTE(p_srate);
1466 UAC2_ATTRIBUTE(p_ssize);
1467 UAC2_ATTRIBUTE(c_chmask);
1468 UAC2_ATTRIBUTE(c_srate);
1469 UAC2_ATTRIBUTE(c_ssize);
1470
1471 static struct configfs_attribute *f_uac2_attrs[] = {
1472         &f_uac2_opts_p_chmask.attr,
1473         &f_uac2_opts_p_srate.attr,
1474         &f_uac2_opts_p_ssize.attr,
1475         &f_uac2_opts_c_chmask.attr,
1476         &f_uac2_opts_c_srate.attr,
1477         &f_uac2_opts_c_ssize.attr,
1478         NULL,
1479 };
1480
1481 static struct config_item_type f_uac2_func_type = {
1482         .ct_item_ops    = &f_uac2_item_ops,
1483         .ct_attrs       = f_uac2_attrs,
1484         .ct_owner       = THIS_MODULE,
1485 };
1486
1487 static void afunc_free_inst(struct usb_function_instance *f)
1488 {
1489         struct f_uac2_opts *opts;
1490
1491         opts = container_of(f, struct f_uac2_opts, func_inst);
1492         kfree(opts);
1493 }
1494
1495 static struct usb_function_instance *afunc_alloc_inst(void)
1496 {
1497         struct f_uac2_opts *opts;
1498
1499         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1500         if (!opts)
1501                 return ERR_PTR(-ENOMEM);
1502
1503         mutex_init(&opts->lock);
1504         opts->func_inst.free_func_inst = afunc_free_inst;
1505
1506         config_group_init_type_name(&opts->func_inst.group, "",
1507                                     &f_uac2_func_type);
1508
1509         opts->p_chmask = UAC2_DEF_PCHMASK;
1510         opts->p_srate = UAC2_DEF_PSRATE;
1511         opts->p_ssize = UAC2_DEF_PSSIZE;
1512         opts->c_chmask = UAC2_DEF_CCHMASK;
1513         opts->c_srate = UAC2_DEF_CSRATE;
1514         opts->c_ssize = UAC2_DEF_CSSIZE;
1515         return &opts->func_inst;
1516 }
1517
1518 static void afunc_free(struct usb_function *f)
1519 {
1520         struct audio_dev *agdev;
1521         struct f_uac2_opts *opts;
1522
1523         agdev = func_to_agdev(f);
1524         opts = container_of(f->fi, struct f_uac2_opts, func_inst);
1525         kfree(agdev);
1526         mutex_lock(&opts->lock);
1527         --opts->refcnt;
1528         mutex_unlock(&opts->lock);
1529 }
1530
1531 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
1532 {
1533         struct audio_dev *agdev = func_to_agdev(f);
1534         struct uac2_rtd_params *prm;
1535
1536         alsa_uac2_exit(agdev);
1537
1538         prm = &agdev->uac2.p_prm;
1539         kfree(prm->rbuf);
1540
1541         prm = &agdev->uac2.c_prm;
1542         kfree(prm->rbuf);
1543         usb_free_all_descriptors(f);
1544
1545         if (agdev->in_ep)
1546                 agdev->in_ep->driver_data = NULL;
1547         if (agdev->out_ep)
1548                 agdev->out_ep->driver_data = NULL;
1549 }
1550
1551 struct usb_function *afunc_alloc(struct usb_function_instance *fi)
1552 {
1553         struct audio_dev *agdev;
1554         struct f_uac2_opts *opts;
1555
1556         agdev = kzalloc(sizeof(*agdev), GFP_KERNEL);
1557         if (agdev == NULL)
1558                 return ERR_PTR(-ENOMEM);
1559
1560         opts = container_of(fi, struct f_uac2_opts, func_inst);
1561         mutex_lock(&opts->lock);
1562         ++opts->refcnt;
1563         mutex_unlock(&opts->lock);
1564
1565         agdev->func.name = "uac2_func";
1566         agdev->func.bind = afunc_bind;
1567         agdev->func.unbind = afunc_unbind;
1568         agdev->func.set_alt = afunc_set_alt;
1569         agdev->func.get_alt = afunc_get_alt;
1570         agdev->func.disable = afunc_disable;
1571         agdev->func.setup = afunc_setup;
1572         agdev->func.free_func = afunc_free;
1573
1574         return &agdev->func;
1575 }
1576
1577 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1578 MODULE_LICENSE("GPL");
1579 MODULE_AUTHOR("Yadwinder Singh");
1580 MODULE_AUTHOR("Jaswinder Singh");