sound/usb/pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/slab.h>
   7 #include <linux/bitrev.h>
   8 #include <linux/ratelimit.h>
   9 #include <linux/usb.h>
  10 #include <linux/usb/audio.h>
  11 #include <linux/usb/audio-v2.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16
  17 #include "usbaudio.h"
  18 #include "card.h"
  19 #include "quirks.h"
  20 #include "debug.h"
  21 #include "endpoint.h"
  22 #include "helper.h"
  23 #include "pcm.h"
  24 #include "clock.h"
  25 #include "power.h"
  26 #include "media.h"
  27
  28 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  30
  31 /* return the estimated delay based on USB frame counters */
  32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33                                     unsigned int rate)
  34 {
  35         int current_frame_number;
  36         int frame_diff;
  37         int est_delay;
  38
  39         if (!subs->last_delay)
  40                 return 0; /* short path */
  41
  42         current_frame_number = usb_get_current_frame_number(subs->dev);
  43         /*
  44          * HCD implementations use different widths, use lower 8 bits.
  45          * The delay will be managed up to 256ms, which is more than
  46          * enough
  47          */
  48         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  49
  50         /* Approximation based on number of samples per USB frame (ms),
  51            some truncation for 44.1 but the estimate is good enough */
  52         est_delay =  frame_diff * rate / 1000;
  53         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  54                 est_delay = subs->last_delay - est_delay;
  55         else
  56                 est_delay = subs->last_delay + est_delay;
  57
  58         if (est_delay < 0)
  59                 est_delay = 0;
  60         return est_delay;
  61 }
  62
  63 /*
  64  * return the current pcm pointer.  just based on the hwptr_done value.
  65  */
  66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  67 {
  68         struct snd_usb_substream *subs = substream->runtime->private_data;
  69         unsigned int hwptr_done;
  70
  71         if (atomic_read(&subs->stream->chip->shutdown))
  72                 return SNDRV_PCM_POS_XRUN;
  73         spin_lock(&subs->lock);
  74         hwptr_done = subs->hwptr_done;
  75         substream->runtime->delay = snd_usb_pcm_delay(subs,
  76                                                 substream->runtime->rate);
  77         spin_unlock(&subs->lock);
  78         return hwptr_done / (substream->runtime->frame_bits >> 3);
  79 }
  80
  81 /*
  82  * find a matching audio format
  83  */
  84 static struct audioformat *find_format(struct snd_usb_substream *subs)
  85 {
  86         struct audioformat *fp;
  87         struct audioformat *found = NULL;
  88         int cur_attr = 0, attr;
  89
  90         list_for_each_entry(fp, &subs->fmt_list, list) {
  91                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
  92                         continue;
  93                 if (fp->channels != subs->channels)
  94                         continue;
  95                 if (subs->cur_rate < fp->rate_min ||
  96                     subs->cur_rate > fp->rate_max)
  97                         continue;
  98                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  99                         unsigned int i;
 100                         for (i = 0; i < fp->nr_rates; i++)
 101                                 if (fp->rate_table[i] == subs->cur_rate)
 102                                         break;
 103                         if (i >= fp->nr_rates)
 104                                 continue;
 105                 }
 106                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 107                 if (! found) {
 108                         found = fp;
 109                         cur_attr = attr;
 110                         continue;
 111                 }
 112                 /* avoid async out and adaptive in if the other method
 113                  * supports the same format.
 114                  * this is a workaround for the case like
 115                  * M-audio audiophile USB.
 116                  */
 117                 if (attr != cur_attr) {
 118                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 119                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 120                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 121                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 122                                 continue;
 123                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 127                                 found = fp;
 128                                 cur_attr = attr;
 129                                 continue;
 130                         }
 131                 }
 132                 /* find the format with the largest max. packet size */
 133                 if (fp->maxpacksize > found->maxpacksize) {
 134                         found = fp;
 135                         cur_attr = attr;
 136                 }
 137         }
 138         return found;
 139 }
 140
 141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 142                          struct usb_host_interface *alts,
 143                          struct audioformat *fmt)
 144 {
 145         struct usb_device *dev = chip->dev;
 146         unsigned int ep;
 147         unsigned char data[1];
 148         int err;
 149
 150         if (get_iface_desc(alts)->bNumEndpoints < 1)
 151                 return -EINVAL;
 152         ep = get_endpoint(alts, 0)->bEndpointAddress;
 153
 154         data[0] = 1;
 155         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 156                               USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 157                               UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 158                               data, sizeof(data));
 159         if (err < 0) {
 160                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 161                               iface, ep);
 162                 return err;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 169                          struct usb_host_interface *alts,
 170                          struct audioformat *fmt)
 171 {
 172         struct usb_device *dev = chip->dev;
 173         unsigned char data[1];
 174         int err;
 175
 176         data[0] = 1;
 177         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 178                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 179                               UAC2_EP_CS_PITCH << 8, 0,
 180                               data, sizeof(data));
 181         if (err < 0) {
 182                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 183                               iface, fmt->altsetting);
 184                 return err;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /*
 191  * initialize the pitch control and sample rate
 192  */
 193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 194                        struct usb_host_interface *alts,
 195                        struct audioformat *fmt)
 196 {
 197         /* if endpoint doesn't have pitch control, bail out */
 198         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199                 return 0;
 200
 201         switch (fmt->protocol) {
 202         case UAC_VERSION_1:
 203         default:
 204                 return init_pitch_v1(chip, iface, alts, fmt);
 205
 206         case UAC_VERSION_2:
 207                 return init_pitch_v2(chip, iface, alts, fmt);
 208         }
 209 }
 210
 211 static int start_endpoints(struct snd_usb_substream *subs)
 212 {
 213         int err;
 214
 215         if (!subs->data_endpoint)
 216                 return -EINVAL;
 217
 218         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 219                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 220
 221                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 222
 223                 ep->data_subs = subs;
 224                 err = snd_usb_endpoint_start(ep);
 225                 if (err < 0) {
 226                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 227                         return err;
 228                 }
 229         }
 230
 231         if (subs->sync_endpoint &&
 232             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 233                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 234
 235                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 236                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 237                         err = usb_set_interface(subs->dev,
 238                                                 subs->sync_endpoint->iface,
 239                                                 subs->sync_endpoint->altsetting);
 240                         if (err < 0) {
 241                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 242                                 dev_err(&subs->dev->dev,
 243                                            "%d:%d: cannot set interface (%d)\n",
 244                                            subs->sync_endpoint->iface,
 245                                            subs->sync_endpoint->altsetting, err);
 246                                 return -EIO;
 247                         }
 248                 }
 249
 250                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 251
 252                 ep->sync_slave = subs->data_endpoint;
 253                 err = snd_usb_endpoint_start(ep);
 254                 if (err < 0) {
 255                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 256                         return err;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 264 {
 265         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 266                 snd_usb_endpoint_stop(subs->sync_endpoint);
 267
 268         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 269                 snd_usb_endpoint_stop(subs->data_endpoint);
 270
 271         if (wait) {
 272                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 273                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 274         }
 275 }
 276
 277 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 278                                      unsigned int altsetting,
 279                                      struct usb_host_interface **alts,
 280                                      unsigned int *ep)
 281 {
 282         struct usb_interface *iface;
 283         struct usb_interface_descriptor *altsd;
 284         struct usb_endpoint_descriptor *epd;
 285
 286         iface = usb_ifnum_to_if(dev, ifnum);
 287         if (!iface || iface->num_altsetting < altsetting + 1)
 288                 return -ENOENT;
 289         *alts = &iface->altsetting[altsetting];
 290         altsd = get_iface_desc(*alts);
 291         if (altsd->bAlternateSetting != altsetting ||
 292             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 293             (altsd->bInterfaceSubClass != 2 &&
 294              altsd->bInterfaceProtocol != 2   ) ||
 295             altsd->bNumEndpoints < 1)
 296                 return -ENOENT;
 297         epd = get_endpoint(*alts, 0);
 298         if (!usb_endpoint_is_isoc_in(epd) ||
 299             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 300                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 301                 return -ENOENT;
 302         *ep = epd->bEndpointAddress;
 303         return 0;
 304 }
 305
 306 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 307  * applies. Returns 1 if a quirk was found.
 308  */
 309 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 310                                          struct usb_device *dev,
 311                                          struct usb_interface_descriptor *altsd,
 312                                          unsigned int attr)
 313 {
 314         struct usb_host_interface *alts;
 315         struct usb_interface *iface;
 316         unsigned int ep;
 317         unsigned int ifnum;
 318
 319         /* Implicit feedback sync EPs consumers are always playback EPs */
 320         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 321                 return 0;
 322
 323         switch (subs->stream->chip->usb_id) {
 324         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 325         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 326                 ep = 0x81;
 327                 ifnum = 3;
 328                 goto add_sync_ep_from_ifnum;
 329         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 330         case USB_ID(0x0763, 0x2081):
 331                 ep = 0x81;
 332                 ifnum = 2;
 333                 goto add_sync_ep_from_ifnum;
 334         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 335                 ep = 0x86;
 336                 ifnum = 2;
 337                 goto add_sync_ep_from_ifnum;
 338         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 339                 ep = 0x81;
 340                 ifnum = 2;
 341                 goto add_sync_ep_from_ifnum;
 342         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 343                 ep = 0x81;
 344                 ifnum = 1;
 345                 goto add_sync_ep_from_ifnum;
 346         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
 347                 ep = 0x84;
 348                 ifnum = 0;
 349                 goto add_sync_ep_from_ifnum;
 350         }
 351
 352         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 353             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 354             altsd->bInterfaceProtocol == 2 &&
 355             altsd->bNumEndpoints == 1 &&
 356             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 357             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 358                                       altsd->bAlternateSetting,
 359                                       &alts, &ep) >= 0) {
 360                 goto add_sync_ep;
 361         }
 362
 363         /* No quirk */
 364         return 0;
 365
 366 add_sync_ep_from_ifnum:
 367         iface = usb_ifnum_to_if(dev, ifnum);
 368
 369         if (!iface || iface->num_altsetting == 0)
 370                 return -EINVAL;
 371
 372         alts = &iface->altsetting[1];
 373
 374 add_sync_ep:
 375         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 376                                                    alts, ep, !subs->direction,
 377                                                    SND_USB_ENDPOINT_TYPE_DATA);
 378         if (!subs->sync_endpoint)
 379                 return -EINVAL;
 380
 381         subs->data_endpoint->sync_master = subs->sync_endpoint;
 382
 383         return 1;
 384 }
 385
 386 static int set_sync_endpoint(struct snd_usb_substream *subs,
 387                              struct audioformat *fmt,
 388                              struct usb_device *dev,
 389                              struct usb_host_interface *alts,
 390                              struct usb_interface_descriptor *altsd)
 391 {
 392         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 393         unsigned int ep, attr;
 394         bool implicit_fb;
 395         int err;
 396
 397         /* we need a sync pipe in async OUT or adaptive IN mode */
 398         /* check the number of EP, since some devices have broken
 399          * descriptors which fool us.  if it has only one EP,
 400          * assume it as adaptive-out or sync-in.
 401          */
 402         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 403
 404         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 405                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 406
 407                 /*
 408                  * In these modes the notion of sync_endpoint is irrelevant.
 409                  * Reset pointers to avoid using stale data from previously
 410                  * used settings, e.g. when configuration and endpoints were
 411                  * changed
 412                  */
 413
 414                 subs->sync_endpoint = NULL;
 415                 subs->data_endpoint->sync_master = NULL;
 416         }
 417
 418         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 419         if (err < 0)
 420                 return err;
 421
 422         /* endpoint set by quirk */
 423         if (err > 0)
 424                 return 0;
 425
 426         if (altsd->bNumEndpoints < 2)
 427                 return 0;
 428
 429         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 430                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 431             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 432                 return 0;
 433
 434         /*
 435          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 436          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 437          * error fall back to SYNC mode and don't create sync endpoint
 438          */
 439
 440         /* check sync-pipe endpoint */
 441         /* ... and check descriptor size before accessing bSynchAddress
 442            because there is a version of the SB Audigy 2 NX firmware lacking
 443            the audio fields in the endpoint descriptors */
 444         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 445             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 446              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 447                 dev_err(&dev->dev,
 448                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 449                            fmt->iface, fmt->altsetting,
 450                            get_endpoint(alts, 1)->bmAttributes,
 451                            get_endpoint(alts, 1)->bLength,
 452                            get_endpoint(alts, 1)->bSynchAddress);
 453                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 454                         return 0;
 455                 return -EINVAL;
 456         }
 457         ep = get_endpoint(alts, 1)->bEndpointAddress;
 458         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 459             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 460              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 461                 dev_err(&dev->dev,
 462                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 463                            fmt->iface, fmt->altsetting,
 464                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 465                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 466                         return 0;
 467                 return -EINVAL;
 468         }
 469
 470         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 471                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 472
 473         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 474                                                    alts, ep, !subs->direction,
 475                                                    implicit_fb ?
 476                                                         SND_USB_ENDPOINT_TYPE_DATA :
 477                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 478         if (!subs->sync_endpoint) {
 479                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 480                         return 0;
 481                 return -EINVAL;
 482         }
 483
 484         subs->data_endpoint->sync_master = subs->sync_endpoint;
 485
 486         return 0;
 487 }
 488
 489 /*
 490  * find a matching format and set up the interface
 491  */
 492 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 493 {
 494         struct usb_device *dev = subs->dev;
 495         struct usb_host_interface *alts;
 496         struct usb_interface_descriptor *altsd;
 497         struct usb_interface *iface;
 498         int err;
 499
 500         iface = usb_ifnum_to_if(dev, fmt->iface);
 501         if (WARN_ON(!iface))
 502                 return -EINVAL;
 503         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 504         altsd = get_iface_desc(alts);
 505         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 506                 return -EINVAL;
 507
 508         if (fmt == subs->cur_audiofmt)
 509                 return 0;
 510
 511         /* close the old interface */
 512         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 513                 if (!subs->stream->chip->keep_iface) {
 514                         err = usb_set_interface(subs->dev, subs->interface, 0);
 515                         if (err < 0) {
 516                                 dev_err(&dev->dev,
 517                                         "%d:%d: return to setting 0 failed (%d)\n",
 518                                         fmt->iface, fmt->altsetting, err);
 519                                 return -EIO;
 520                         }
 521                 }
 522                 subs->interface = -1;
 523                 subs->altset_idx = 0;
 524         }
 525
 526         /* set interface */
 527         if (iface->cur_altsetting != alts) {
 528                 err = snd_usb_select_mode_quirk(subs, fmt);
 529                 if (err < 0)
 530                         return -EIO;
 531
 532                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 533                 if (err < 0) {
 534                         dev_err(&dev->dev,
 535                                 "%d:%d: usb_set_interface failed (%d)\n",
 536                                 fmt->iface, fmt->altsetting, err);
 537                         return -EIO;
 538                 }
 539                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 540                         fmt->iface, fmt->altsetting);
 541                 snd_usb_set_interface_quirk(dev);
 542         }
 543
 544         subs->interface = fmt->iface;
 545         subs->altset_idx = fmt->altset_idx;
 546         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 547                                                    alts, fmt->endpoint, subs->direction,
 548                                                    SND_USB_ENDPOINT_TYPE_DATA);
 549
 550         if (!subs->data_endpoint)
 551                 return -EINVAL;
 552
 553         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 554         if (err < 0)
 555                 return err;
 556
 557         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 558         if (err < 0)
 559                 return err;
 560
 561         subs->cur_audiofmt = fmt;
 562
 563         snd_usb_set_format_quirk(subs, fmt);
 564
 565         return 0;
 566 }
 567
 568 /*
 569  * Return the score of matching two audioformats.
 570  * Veto the audioformat if:
 571  * - It has no channels for some reason.
 572  * - Requested PCM format is not supported.
 573  * - Requested sample rate is not supported.
 574  */
 575 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 576                                        struct audioformat *fp,
 577                                        struct audioformat *match, int rate,
 578                                        snd_pcm_format_t pcm_format)
 579 {
 580         int i;
 581         int score = 0;
 582
 583         if (fp->channels < 1) {
 584                 dev_dbg(&subs->dev->dev,
 585                         "%s: (fmt @%p) no channels\n", __func__, fp);
 586                 return 0;
 587         }
 588
 589         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 590                 dev_dbg(&subs->dev->dev,
 591                         "%s: (fmt @%p) no match for format %d\n", __func__,
 592                         fp, pcm_format);
 593                 return 0;
 594         }
 595
 596         for (i = 0; i < fp->nr_rates; i++) {
 597                 if (fp->rate_table[i] == rate) {
 598                         score++;
 599                         break;
 600                 }
 601         }
 602         if (!score) {
 603                 dev_dbg(&subs->dev->dev,
 604                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 605                         fp, rate);
 606                 return 0;
 607         }
 608
 609         if (fp->channels == match->channels)
 610                 score++;
 611
 612         dev_dbg(&subs->dev->dev,
 613                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 614
 615         return score;
 616 }
 617
 618 /*
 619  * Configure the sync ep using the rate and pcm format of the data ep.
 620  */
 621 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 622 {
 623         int ret;
 624         struct audioformat *fp;
 625         struct audioformat *sync_fp = NULL;
 626         int cur_score = 0;
 627         int sync_period_bytes = subs->period_bytes;
 628         struct snd_usb_substream *sync_subs =
 629                 &subs->stream->substream[subs->direction ^ 1];
 630
 631         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 632             !subs->stream)
 633                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 634                                                    subs->pcm_format,
 635                                                    subs->channels,
 636                                                    subs->period_bytes,
 637                                                    0, 0,
 638                                                    subs->cur_rate,
 639                                                    subs->cur_audiofmt,
 640                                                    NULL);
 641
 642         /* Try to find the best matching audioformat. */
 643         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 644                 int score = match_endpoint_audioformats(subs,
 645                                                         fp, subs->cur_audiofmt,
 646                         subs->cur_rate, subs->pcm_format);
 647
 648                 if (score > cur_score) {
 649                         sync_fp = fp;
 650                         cur_score = score;
 651                 }
 652         }
 653
 654         if (unlikely(sync_fp == NULL)) {
 655                 dev_err(&subs->dev->dev,
 656                         "%s: no valid audioformat for sync ep %x found\n",
 657                         __func__, sync_subs->ep_num);
 658                 return -EINVAL;
 659         }
 660
 661         /*
 662          * Recalculate the period bytes if channel number differ between
 663          * data and sync ep audioformat.
 664          */
 665         if (sync_fp->channels != subs->channels) {
 666                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 667                         sync_fp->channels;
 668                 dev_dbg(&subs->dev->dev,
 669                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 670                         __func__, subs->period_bytes, sync_period_bytes);
 671         }
 672
 673         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 674                                           subs->pcm_format,
 675                                           sync_fp->channels,
 676                                           sync_period_bytes,
 677                                           0, 0,
 678                                           subs->cur_rate,
 679                                           sync_fp,
 680                                           NULL);
 681
 682         return ret;
 683 }
 684
 685 /*
 686  * configure endpoint params
 687  *
 688  * called  during initial setup and upon resume
 689  */
 690 static int configure_endpoint(struct snd_usb_substream *subs)
 691 {
 692         int ret;
 693
 694         /* format changed */
 695         stop_endpoints(subs, true);
 696         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 697                                           subs->pcm_format,
 698                                           subs->channels,
 699                                           subs->period_bytes,
 700                                           subs->period_frames,
 701                                           subs->buffer_periods,
 702                                           subs->cur_rate,
 703                                           subs->cur_audiofmt,
 704                                           subs->sync_endpoint);
 705         if (ret < 0)
 706                 return ret;
 707
 708         if (subs->sync_endpoint)
 709                 ret = configure_sync_endpoint(subs);
 710
 711         return ret;
 712 }
 713
 714 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 715 {
 716         int ret;
 717
 718         if (!subs->str_pd)
 719                 return 0;
 720
 721         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 722         if (ret < 0) {
 723                 dev_err(&subs->dev->dev,
 724                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 725                         subs->str_pd->pd_id, state, ret);
 726                 return ret;
 727         }
 728
 729         return 0;
 730 }
 731
 732 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 733 {
 734         int ret;
 735
 736         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 737         if (ret < 0)
 738                 return ret;
 739
 740         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 741         if (ret < 0)
 742                 return ret;
 743
 744         return 0;
 745 }
 746
 747 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 748 {
 749         int ret;
 750
 751         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 752         if (ret < 0)
 753                 return ret;
 754
 755         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 756         if (ret < 0)
 757                 return ret;
 758
 759         return 0;
 760 }
 761
 762 /*
 763  * hw_params callback
 764  *
 765  * allocate a buffer and set the given audio format.
 766  *
 767  * so far we use a physically linear buffer although packetize transfer
 768  * doesn't need a continuous area.
 769  * if sg buffer is supported on the later version of alsa, we'll follow
 770  * that.
 771  */
 772 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 773                              struct snd_pcm_hw_params *hw_params)
 774 {
 775         struct snd_usb_substream *subs = substream->runtime->private_data;
 776         struct audioformat *fmt;
 777         int ret;
 778
 779         ret = snd_media_start_pipeline(subs);
 780         if (ret)
 781                 return ret;
 782
 783         if (snd_usb_use_vmalloc)
 784                 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 785                                                        params_buffer_bytes(hw_params));
 786         else
 787                 ret = snd_pcm_lib_malloc_pages(substream,
 788                                                params_buffer_bytes(hw_params));
 789         if (ret < 0)
 790                 goto stop_pipeline;
 791
 792         subs->pcm_format = params_format(hw_params);
 793         subs->period_bytes = params_period_bytes(hw_params);
 794         subs->period_frames = params_period_size(hw_params);
 795         subs->buffer_periods = params_periods(hw_params);
 796         subs->channels = params_channels(hw_params);
 797         subs->cur_rate = params_rate(hw_params);
 798
 799         fmt = find_format(subs);
 800         if (!fmt) {
 801                 dev_dbg(&subs->dev->dev,
 802                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 803                            subs->pcm_format, subs->cur_rate, subs->channels);
 804                 ret = -EINVAL;
 805                 goto stop_pipeline;
 806         }
 807
 808         ret = snd_usb_lock_shutdown(subs->stream->chip);
 809         if (ret < 0)
 810                 goto stop_pipeline;
 811
 812         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 813         if (ret < 0)
 814                 goto unlock;
 815
 816         ret = set_format(subs, fmt);
 817         if (ret < 0)
 818                 goto unlock;
 819
 820         subs->interface = fmt->iface;
 821         subs->altset_idx = fmt->altset_idx;
 822         subs->need_setup_ep = true;
 823
 824  unlock:
 825         snd_usb_unlock_shutdown(subs->stream->chip);
 826         if (ret < 0)
 827                 goto stop_pipeline;
 828         return ret;
 829
 830  stop_pipeline:
 831         snd_media_stop_pipeline(subs);
 832         return ret;
 833 }
 834
 835 /*
 836  * hw_free callback
 837  *
 838  * reset the audio format and release the buffer
 839  */
 840 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 841 {
 842         struct snd_usb_substream *subs = substream->runtime->private_data;
 843
 844         snd_media_stop_pipeline(subs);
 845         subs->cur_audiofmt = NULL;
 846         subs->cur_rate = 0;
 847         subs->period_bytes = 0;
 848         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 849                 stop_endpoints(subs, true);
 850                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 851                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 852                 snd_usb_unlock_shutdown(subs->stream->chip);
 853         }
 854
 855         if (snd_usb_use_vmalloc)
 856                 return snd_pcm_lib_free_vmalloc_buffer(substream);
 857         else
 858                 return snd_pcm_lib_free_pages(substream);
 859 }
 860
 861 /*
 862  * prepare callback
 863  *
 864  * only a few subtle things...
 865  */
 866 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 867 {
 868         struct snd_pcm_runtime *runtime = substream->runtime;
 869         struct snd_usb_substream *subs = runtime->private_data;
 870         struct usb_host_interface *alts;
 871         struct usb_interface *iface;
 872         int ret;
 873
 874         if (! subs->cur_audiofmt) {
 875                 dev_err(&subs->dev->dev, "no format is specified!\n");
 876                 return -ENXIO;
 877         }
 878
 879         ret = snd_usb_lock_shutdown(subs->stream->chip);
 880         if (ret < 0)
 881                 return ret;
 882         if (snd_BUG_ON(!subs->data_endpoint)) {
 883                 ret = -EIO;
 884                 goto unlock;
 885         }
 886
 887         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 888         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 889
 890         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 891         if (ret < 0)
 892                 goto unlock;
 893
 894         ret = set_format(subs, subs->cur_audiofmt);
 895         if (ret < 0)
 896                 goto unlock;
 897
 898         if (subs->need_setup_ep) {
 899
 900                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 901                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 902                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 903                                                subs->cur_audiofmt->iface,
 904                                                alts,
 905                                                subs->cur_audiofmt,
 906                                                subs->cur_rate);
 907                 if (ret < 0)
 908                         goto unlock;
 909
 910                 ret = configure_endpoint(subs);
 911                 if (ret < 0)
 912                         goto unlock;
 913                 subs->need_setup_ep = false;
 914         }
 915
 916         /* some unit conversions in runtime */
 917         subs->data_endpoint->maxframesize =
 918                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 919         subs->data_endpoint->curframesize =
 920                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 921
 922         /* reset the pointer */
 923         subs->hwptr_done = 0;
 924         subs->transfer_done = 0;
 925         subs->last_delay = 0;
 926         subs->last_frame_number = 0;
 927         runtime->delay = 0;
 928
 929         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 930          * updates for all URBs would happen at the same time when starting */
 931         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 932                 ret = start_endpoints(subs);
 933
 934  unlock:
 935         snd_usb_unlock_shutdown(subs->stream->chip);
 936         return ret;
 937 }
 938
 939 static const struct snd_pcm_hardware snd_usb_hardware =
 940 {
 941         .info =                 SNDRV_PCM_INFO_MMAP |
 942                                 SNDRV_PCM_INFO_MMAP_VALID |
 943                                 SNDRV_PCM_INFO_BATCH |
 944                                 SNDRV_PCM_INFO_INTERLEAVED |
 945                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 946                                 SNDRV_PCM_INFO_PAUSE,
 947         .buffer_bytes_max =     1024 * 1024,
 948         .period_bytes_min =     64,
 949         .period_bytes_max =     512 * 1024,
 950         .periods_min =          2,
 951         .periods_max =          1024,
 952 };
 953
 954 static int hw_check_valid_format(struct snd_usb_substream *subs,
 955                                  struct snd_pcm_hw_params *params,
 956                                  struct audioformat *fp)
 957 {
 958         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 959         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 960         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 961         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 962         struct snd_mask check_fmts;
 963         unsigned int ptime;
 964
 965         /* check the format */
 966         snd_mask_none(&check_fmts);
 967         check_fmts.bits[0] = (u32)fp->formats;
 968         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 969         snd_mask_intersect(&check_fmts, fmts);
 970         if (snd_mask_empty(&check_fmts)) {
 971                 hwc_debug("   > check: no supported format %d\n", fp->format);
 972                 return 0;
 973         }
 974         /* check the channels */
 975         if (fp->channels < ct->min || fp->channels > ct->max) {
 976                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 977                 return 0;
 978         }
 979         /* check the rate is within the range */
 980         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 981                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 982                 return 0;
 983         }
 984         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 985                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 986                 return 0;
 987         }
 988         /* check whether the period time is >= the data packet interval */
 989         if (subs->speed != USB_SPEED_FULL) {
 990                 ptime = 125 * (1 << fp->datainterval);
 991                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 992                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 993                         return 0;
 994                 }
 995         }
 996         return 1;
 997 }
 998
 999 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1000                         struct snd_pcm_hw_rule *rule)
1001 {
1002         struct snd_usb_substream *subs = rule->private;
1003         struct audioformat *fp;
1004         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1005         unsigned int rmin, rmax;
1006         int changed;
1007
1008         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1009         changed = 0;
1010         rmin = rmax = 0;
1011         list_for_each_entry(fp, &subs->fmt_list, list) {
1012                 if (!hw_check_valid_format(subs, params, fp))
1013                         continue;
1014                 if (changed++) {
1015                         if (rmin > fp->rate_min)
1016                                 rmin = fp->rate_min;
1017                         if (rmax < fp->rate_max)
1018                                 rmax = fp->rate_max;
1019                 } else {
1020                         rmin = fp->rate_min;
1021                         rmax = fp->rate_max;
1022                 }
1023         }
1024
1025         if (!changed) {
1026                 hwc_debug("  --> get empty\n");
1027                 it->empty = 1;
1028                 return -EINVAL;
1029         }
1030
1031         changed = 0;
1032         if (it->min < rmin) {
1033                 it->min = rmin;
1034                 it->openmin = 0;
1035                 changed = 1;
1036         }
1037         if (it->max > rmax) {
1038                 it->max = rmax;
1039                 it->openmax = 0;
1040                 changed = 1;
1041         }
1042         if (snd_interval_checkempty(it)) {
1043                 it->empty = 1;
1044                 return -EINVAL;
1045         }
1046         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1047         return changed;
1048 }
1049
1050
1051 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1052                             struct snd_pcm_hw_rule *rule)
1053 {
1054         struct snd_usb_substream *subs = rule->private;
1055         struct audioformat *fp;
1056         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1057         unsigned int rmin, rmax;
1058         int changed;
1059
1060         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1061         changed = 0;
1062         rmin = rmax = 0;
1063         list_for_each_entry(fp, &subs->fmt_list, list) {
1064                 if (!hw_check_valid_format(subs, params, fp))
1065                         continue;
1066                 if (changed++) {
1067                         if (rmin > fp->channels)
1068                                 rmin = fp->channels;
1069                         if (rmax < fp->channels)
1070                                 rmax = fp->channels;
1071                 } else {
1072                         rmin = fp->channels;
1073                         rmax = fp->channels;
1074                 }
1075         }
1076
1077         if (!changed) {
1078                 hwc_debug("  --> get empty\n");
1079                 it->empty = 1;
1080                 return -EINVAL;
1081         }
1082
1083         changed = 0;
1084         if (it->min < rmin) {
1085                 it->min = rmin;
1086                 it->openmin = 0;
1087                 changed = 1;
1088         }
1089         if (it->max > rmax) {
1090                 it->max = rmax;
1091                 it->openmax = 0;
1092                 changed = 1;
1093         }
1094         if (snd_interval_checkempty(it)) {
1095                 it->empty = 1;
1096                 return -EINVAL;
1097         }
1098         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1099         return changed;
1100 }
1101
1102 static int hw_rule_format(struct snd_pcm_hw_params *params,
1103                           struct snd_pcm_hw_rule *rule)
1104 {
1105         struct snd_usb_substream *subs = rule->private;
1106         struct audioformat *fp;
1107         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1108         u64 fbits;
1109         u32 oldbits[2];
1110         int changed;
1111
1112         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1113         fbits = 0;
1114         list_for_each_entry(fp, &subs->fmt_list, list) {
1115                 if (!hw_check_valid_format(subs, params, fp))
1116                         continue;
1117                 fbits |= fp->formats;
1118         }
1119
1120         oldbits[0] = fmt->bits[0];
1121         oldbits[1] = fmt->bits[1];
1122         fmt->bits[0] &= (u32)fbits;
1123         fmt->bits[1] &= (u32)(fbits >> 32);
1124         if (!fmt->bits[0] && !fmt->bits[1]) {
1125                 hwc_debug("  --> get empty\n");
1126                 return -EINVAL;
1127         }
1128         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1129         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1130         return changed;
1131 }
1132
1133 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1134                                struct snd_pcm_hw_rule *rule)
1135 {
1136         struct snd_usb_substream *subs = rule->private;
1137         struct audioformat *fp;
1138         struct snd_interval *it;
1139         unsigned char min_datainterval;
1140         unsigned int pmin;
1141         int changed;
1142
1143         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1144         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1145         min_datainterval = 0xff;
1146         list_for_each_entry(fp, &subs->fmt_list, list) {
1147                 if (!hw_check_valid_format(subs, params, fp))
1148                         continue;
1149                 min_datainterval = min(min_datainterval, fp->datainterval);
1150         }
1151         if (min_datainterval == 0xff) {
1152                 hwc_debug("  --> get empty\n");
1153                 it->empty = 1;
1154                 return -EINVAL;
1155         }
1156         pmin = 125 * (1 << min_datainterval);
1157         changed = 0;
1158         if (it->min < pmin) {
1159                 it->min = pmin;
1160                 it->openmin = 0;
1161                 changed = 1;
1162         }
1163         if (snd_interval_checkempty(it)) {
1164                 it->empty = 1;
1165                 return -EINVAL;
1166         }
1167         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1168         return changed;
1169 }
1170
1171 /*
1172  *  If the device supports unusual bit rates, does the request meet these?
1173  */
1174 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1175                                   struct snd_usb_substream *subs)
1176 {
1177         struct audioformat *fp;
1178         int *rate_list;
1179         int count = 0, needs_knot = 0;
1180         int err;
1181
1182         kfree(subs->rate_list.list);
1183         subs->rate_list.list = NULL;
1184
1185         list_for_each_entry(fp, &subs->fmt_list, list) {
1186                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1187                         return 0;
1188                 count += fp->nr_rates;
1189                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1190                         needs_knot = 1;
1191         }
1192         if (!needs_knot)
1193                 return 0;
1194
1195         subs->rate_list.list = rate_list =
1196                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1197         if (!subs->rate_list.list)
1198                 return -ENOMEM;
1199         subs->rate_list.count = count;
1200         subs->rate_list.mask = 0;
1201         count = 0;
1202         list_for_each_entry(fp, &subs->fmt_list, list) {
1203                 int i;
1204                 for (i = 0; i < fp->nr_rates; i++)
1205                         rate_list[count++] = fp->rate_table[i];
1206         }
1207         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1208                                          &subs->rate_list);
1209         if (err < 0)
1210                 return err;
1211
1212         return 0;
1213 }
1214
1215
1216 /*
1217  * set up the runtime hardware information.
1218  */
1219
1220 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1221 {
1222         struct audioformat *fp;
1223         unsigned int pt, ptmin;
1224         int param_period_time_if_needed;
1225         int err;
1226
1227         runtime->hw.formats = subs->formats;
1228
1229         runtime->hw.rate_min = 0x7fffffff;
1230         runtime->hw.rate_max = 0;
1231         runtime->hw.channels_min = 256;
1232         runtime->hw.channels_max = 0;
1233         runtime->hw.rates = 0;
1234         ptmin = UINT_MAX;
1235         /* check min/max rates and channels */
1236         list_for_each_entry(fp, &subs->fmt_list, list) {
1237                 runtime->hw.rates |= fp->rates;
1238                 if (runtime->hw.rate_min > fp->rate_min)
1239                         runtime->hw.rate_min = fp->rate_min;
1240                 if (runtime->hw.rate_max < fp->rate_max)
1241                         runtime->hw.rate_max = fp->rate_max;
1242                 if (runtime->hw.channels_min > fp->channels)
1243                         runtime->hw.channels_min = fp->channels;
1244                 if (runtime->hw.channels_max < fp->channels)
1245                         runtime->hw.channels_max = fp->channels;
1246                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1247                         /* FIXME: there might be more than one audio formats... */
1248                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1249                                 fp->frame_size;
1250                 }
1251                 pt = 125 * (1 << fp->datainterval);
1252                 ptmin = min(ptmin, pt);
1253         }
1254
1255         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1256         if (subs->speed == USB_SPEED_FULL)
1257                 /* full speed devices have fixed data packet interval */
1258                 ptmin = 1000;
1259         if (ptmin == 1000)
1260                 /* if period time doesn't go below 1 ms, no rules needed */
1261                 param_period_time_if_needed = -1;
1262
1263         err = snd_pcm_hw_constraint_minmax(runtime,
1264                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1265                                            ptmin, UINT_MAX);
1266         if (err < 0)
1267                 return err;
1268
1269         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1270                                   hw_rule_rate, subs,
1271                                   SNDRV_PCM_HW_PARAM_FORMAT,
1272                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1273                                   param_period_time_if_needed,
1274                                   -1);
1275         if (err < 0)
1276                 return err;
1277         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1278                                   hw_rule_channels, subs,
1279                                   SNDRV_PCM_HW_PARAM_FORMAT,
1280                                   SNDRV_PCM_HW_PARAM_RATE,
1281                                   param_period_time_if_needed,
1282                                   -1);
1283         if (err < 0)
1284                 return err;
1285         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1286                                   hw_rule_format, subs,
1287                                   SNDRV_PCM_HW_PARAM_RATE,
1288                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1289                                   param_period_time_if_needed,
1290                                   -1);
1291         if (err < 0)
1292                 return err;
1293         if (param_period_time_if_needed >= 0) {
1294                 err = snd_pcm_hw_rule_add(runtime, 0,
1295                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1296                                           hw_rule_period_time, subs,
1297                                           SNDRV_PCM_HW_PARAM_FORMAT,
1298                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1299                                           SNDRV_PCM_HW_PARAM_RATE,
1300                                           -1);
1301                 if (err < 0)
1302                         return err;
1303         }
1304         err = snd_usb_pcm_check_knot(runtime, subs);
1305         if (err < 0)
1306                 return err;
1307
1308         return snd_usb_autoresume(subs->stream->chip);
1309 }
1310
1311 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1312 {
1313         int direction = substream->stream;
1314         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1315         struct snd_pcm_runtime *runtime = substream->runtime;
1316         struct snd_usb_substream *subs = &as->substream[direction];
1317         int ret;
1318
1319         subs->interface = -1;
1320         subs->altset_idx = 0;
1321         runtime->hw = snd_usb_hardware;
1322         runtime->private_data = subs;
1323         subs->pcm_substream = substream;
1324         /* runtime PM is also done there */
1325
1326         /* initialize DSD/DOP context */
1327         subs->dsd_dop.byte_idx = 0;
1328         subs->dsd_dop.channel = 0;
1329         subs->dsd_dop.marker = 1;
1330
1331         ret = setup_hw_info(runtime, subs);
1332         if (ret == 0) {
1333                 ret = snd_media_stream_init(subs, as->pcm, direction);
1334                 if (ret)
1335                         snd_usb_autosuspend(subs->stream->chip);
1336         }
1337         return ret;
1338 }
1339
1340 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1341 {
1342         int direction = substream->stream;
1343         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1344         struct snd_usb_substream *subs = &as->substream[direction];
1345         int ret;
1346
1347         stop_endpoints(subs, true);
1348         snd_media_stop_pipeline(subs);
1349
1350         if (!as->chip->keep_iface &&
1351             subs->interface >= 0 &&
1352             !snd_usb_lock_shutdown(subs->stream->chip)) {
1353                 usb_set_interface(subs->dev, subs->interface, 0);
1354                 subs->interface = -1;
1355                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1356                 snd_usb_unlock_shutdown(subs->stream->chip);
1357                 if (ret < 0)
1358                         return ret;
1359         }
1360
1361         subs->pcm_substream = NULL;
1362         snd_usb_autosuspend(subs->stream->chip);
1363
1364         return 0;
1365 }
1366
1367 /* Since a URB can handle only a single linear buffer, we must use double
1368  * buffering when the data to be transferred overflows the buffer boundary.
1369  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1370  * for all URBs.
1371  */
1372 static void retire_capture_urb(struct snd_usb_substream *subs,
1373                                struct urb *urb)
1374 {
1375         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1376         unsigned int stride, frames, bytes, oldptr;
1377         int i, period_elapsed = 0;
1378         unsigned long flags;
1379         unsigned char *cp;
1380         int current_frame_number;
1381
1382         /* read frame number here, update pointer in critical section */
1383         current_frame_number = usb_get_current_frame_number(subs->dev);
1384
1385         stride = runtime->frame_bits >> 3;
1386
1387         for (i = 0; i < urb->number_of_packets; i++) {
1388                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1389                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1390                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1391                                 i, urb->iso_frame_desc[i].status);
1392                         // continue;
1393                 }
1394                 bytes = urb->iso_frame_desc[i].actual_length;
1395                 frames = bytes / stride;
1396                 if (!subs->txfr_quirk)
1397                         bytes = frames * stride;
1398                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1399                         int oldbytes = bytes;
1400                         bytes = frames * stride;
1401                         dev_warn_ratelimited(&subs->dev->dev,
1402                                  "Corrected urb data len. %d->%d\n",
1403                                                         oldbytes, bytes);
1404                 }
1405                 /* update the current pointer */
1406                 spin_lock_irqsave(&subs->lock, flags);
1407                 oldptr = subs->hwptr_done;
1408                 subs->hwptr_done += bytes;
1409                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1410                         subs->hwptr_done -= runtime->buffer_size * stride;
1411                 frames = (bytes + (oldptr % stride)) / stride;
1412                 subs->transfer_done += frames;
1413                 if (subs->transfer_done >= runtime->period_size) {
1414                         subs->transfer_done -= runtime->period_size;
1415                         period_elapsed = 1;
1416                 }
1417                 /* capture delay is by construction limited to one URB,
1418                  * reset delays here
1419                  */
1420                 runtime->delay = subs->last_delay = 0;
1421
1422                 /* realign last_frame_number */
1423                 subs->last_frame_number = current_frame_number;
1424                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1425
1426                 spin_unlock_irqrestore(&subs->lock, flags);
1427                 /* copy a data chunk */
1428                 if (oldptr + bytes > runtime->buffer_size * stride) {
1429                         unsigned int bytes1 =
1430                                         runtime->buffer_size * stride - oldptr;
1431                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1432                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1433                 } else {
1434                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1435                 }
1436         }
1437
1438         if (period_elapsed)
1439                 snd_pcm_period_elapsed(subs->pcm_substream);
1440 }
1441
1442 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1443                                              struct urb *urb, unsigned int bytes)
1444 {
1445         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1446         unsigned int stride = runtime->frame_bits >> 3;
1447         unsigned int dst_idx = 0;
1448         unsigned int src_idx = subs->hwptr_done;
1449         unsigned int wrap = runtime->buffer_size * stride;
1450         u8 *dst = urb->transfer_buffer;
1451         u8 *src = runtime->dma_area;
1452         u8 marker[] = { 0x05, 0xfa };
1453
1454         /*
1455          * The DSP DOP format defines a way to transport DSD samples over
1456          * normal PCM data endpoints. It requires stuffing of marker bytes
1457          * (0x05 and 0xfa, alternating per sample frame), and then expects
1458          * 2 additional bytes of actual payload. The whole frame is stored
1459          * LSB.
1460          *
1461          * Hence, for a stereo transport, the buffer layout looks like this,
1462          * where L refers to left channel samples and R to right.
1463          *
1464          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1465          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1466          *   .....
1467          *
1468          */
1469
1470         while (bytes--) {
1471                 if (++subs->dsd_dop.byte_idx == 3) {
1472                         /* frame boundary? */
1473                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1474                         src_idx += 2;
1475                         subs->dsd_dop.byte_idx = 0;
1476
1477                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1478                                 /* alternate the marker */
1479                                 subs->dsd_dop.marker++;
1480                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1481                                 subs->dsd_dop.channel = 0;
1482                         }
1483                 } else {
1484                         /* stuff the DSD payload */
1485                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1486
1487                         if (subs->cur_audiofmt->dsd_bitrev)
1488                                 dst[dst_idx++] = bitrev8(src[idx]);
1489                         else
1490                                 dst[dst_idx++] = src[idx];
1491
1492                         subs->hwptr_done++;
1493                 }
1494         }
1495         if (subs->hwptr_done >= runtime->buffer_size * stride)
1496                 subs->hwptr_done -= runtime->buffer_size * stride;
1497 }
1498
1499 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1500                         int offset, int stride, unsigned int bytes)
1501 {
1502         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1503
1504         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1505                 /* err, the transferred area goes over buffer boundary. */
1506                 unsigned int bytes1 =
1507                         runtime->buffer_size * stride - subs->hwptr_done;
1508                 memcpy(urb->transfer_buffer + offset,
1509                        runtime->dma_area + subs->hwptr_done, bytes1);
1510                 memcpy(urb->transfer_buffer + offset + bytes1,
1511                        runtime->dma_area, bytes - bytes1);
1512         } else {
1513                 memcpy(urb->transfer_buffer + offset,
1514                        runtime->dma_area + subs->hwptr_done, bytes);
1515         }
1516         subs->hwptr_done += bytes;
1517         if (subs->hwptr_done >= runtime->buffer_size * stride)
1518                 subs->hwptr_done -= runtime->buffer_size * stride;
1519 }
1520
1521 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1522                                       struct urb *urb, int stride,
1523                                       unsigned int bytes)
1524 {
1525         __le32 packet_length;
1526         int i;
1527
1528         /* Put __le32 length descriptor at start of each packet. */
1529         for (i = 0; i < urb->number_of_packets; i++) {
1530                 unsigned int length = urb->iso_frame_desc[i].length;
1531                 unsigned int offset = urb->iso_frame_desc[i].offset;
1532
1533                 packet_length = cpu_to_le32(length);
1534                 offset += i * sizeof(packet_length);
1535                 urb->iso_frame_desc[i].offset = offset;
1536                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1537                 memcpy(urb->transfer_buffer + offset,
1538                        &packet_length, sizeof(packet_length));
1539                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1540                             stride, length);
1541         }
1542         /* Adjust transfer size accordingly. */
1543         bytes += urb->number_of_packets * sizeof(packet_length);
1544         return bytes;
1545 }
1546
1547 static void prepare_playback_urb(struct snd_usb_substream *subs,
1548                                  struct urb *urb)
1549 {
1550         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1551         struct snd_usb_endpoint *ep = subs->data_endpoint;
1552         struct snd_urb_ctx *ctx = urb->context;
1553         unsigned int counts, frames, bytes;
1554         int i, stride, period_elapsed = 0;
1555         unsigned long flags;
1556
1557         stride = runtime->frame_bits >> 3;
1558
1559         frames = 0;
1560         urb->number_of_packets = 0;
1561         spin_lock_irqsave(&subs->lock, flags);
1562         subs->frame_limit += ep->max_urb_frames;
1563         for (i = 0; i < ctx->packets; i++) {
1564                 if (ctx->packet_size[i])
1565                         counts = ctx->packet_size[i];
1566                 else
1567                         counts = snd_usb_endpoint_next_packet_size(ep);
1568
1569                 /* set up descriptor */
1570                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1571                 urb->iso_frame_desc[i].length = counts * ep->stride;
1572                 frames += counts;
1573                 urb->number_of_packets++;
1574                 subs->transfer_done += counts;
1575                 if (subs->transfer_done >= runtime->period_size) {
1576                         subs->transfer_done -= runtime->period_size;
1577                         subs->frame_limit = 0;
1578                         period_elapsed = 1;
1579                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1580                                 if (subs->transfer_done > 0) {
1581                                         /* FIXME: fill-max mode is not
1582                                          * supported yet */
1583                                         frames -= subs->transfer_done;
1584                                         counts -= subs->transfer_done;
1585                                         urb->iso_frame_desc[i].length =
1586                                                 counts * ep->stride;
1587                                         subs->transfer_done = 0;
1588                                 }
1589                                 i++;
1590                                 if (i < ctx->packets) {
1591                                         /* add a transfer delimiter */
1592                                         urb->iso_frame_desc[i].offset =
1593                                                 frames * ep->stride;
1594                                         urb->iso_frame_desc[i].length = 0;
1595                                         urb->number_of_packets++;
1596                                 }
1597                                 break;
1598                         }
1599                 }
1600                 /* finish at the period boundary or after enough frames */
1601                 if ((period_elapsed ||
1602                                 subs->transfer_done >= subs->frame_limit) &&
1603                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1604                         break;
1605         }
1606         bytes = frames * ep->stride;
1607
1608         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1609                      subs->cur_audiofmt->dsd_dop)) {
1610                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1611         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1612                            subs->cur_audiofmt->dsd_bitrev)) {
1613                 /* bit-reverse the bytes */
1614                 u8 *buf = urb->transfer_buffer;
1615                 for (i = 0; i < bytes; i++) {
1616                         int idx = (subs->hwptr_done + i)
1617                                 % (runtime->buffer_size * stride);
1618                         buf[i] = bitrev8(runtime->dma_area[idx]);
1619                 }
1620
1621                 subs->hwptr_done += bytes;
1622                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1623                         subs->hwptr_done -= runtime->buffer_size * stride;
1624         } else {
1625                 /* usual PCM */
1626                 if (!subs->tx_length_quirk)
1627                         copy_to_urb(subs, urb, 0, stride, bytes);
1628                 else
1629                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1630                         /* bytes is now amount of outgoing data */
1631         }
1632
1633         /* update delay with exact number of samples queued */
1634         runtime->delay = subs->last_delay;
1635         runtime->delay += frames;
1636         subs->last_delay = runtime->delay;
1637
1638         /* realign last_frame_number */
1639         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1640         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1641
1642         if (subs->trigger_tstamp_pending_update) {
1643                 /* this is the first actual URB submitted,
1644                  * update trigger timestamp to reflect actual start time
1645                  */
1646                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1647                 subs->trigger_tstamp_pending_update = false;
1648         }
1649
1650         spin_unlock_irqrestore(&subs->lock, flags);
1651         urb->transfer_buffer_length = bytes;
1652         if (period_elapsed)
1653                 snd_pcm_period_elapsed(subs->pcm_substream);
1654 }
1655
1656 /*
1657  * process after playback data complete
1658  * - decrease the delay count again
1659  */
1660 static void retire_playback_urb(struct snd_usb_substream *subs,
1661                                struct urb *urb)
1662 {
1663         unsigned long flags;
1664         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1665         struct snd_usb_endpoint *ep = subs->data_endpoint;
1666         int processed = urb->transfer_buffer_length / ep->stride;
1667         int est_delay;
1668
1669         /* ignore the delay accounting when procssed=0 is given, i.e.
1670          * silent payloads are procssed before handling the actual data
1671          */
1672         if (!processed)
1673                 return;
1674
1675         spin_lock_irqsave(&subs->lock, flags);
1676         if (!subs->last_delay)
1677                 goto out; /* short path */
1678
1679         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1680         /* update delay with exact number of samples played */
1681         if (processed > subs->last_delay)
1682                 subs->last_delay = 0;
1683         else
1684                 subs->last_delay -= processed;
1685         runtime->delay = subs->last_delay;
1686
1687         /*
1688          * Report when delay estimate is off by more than 2ms.
1689          * The error should be lower than 2ms since the estimate relies
1690          * on two reads of a counter updated every ms.
1691          */
1692         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1693                 dev_dbg_ratelimited(&subs->dev->dev,
1694                         "delay: estimated %d, actual %d\n",
1695                         est_delay, subs->last_delay);
1696
1697         if (!subs->running) {
1698                 /* update last_frame_number for delay counting here since
1699                  * prepare_playback_urb won't be called during pause
1700                  */
1701                 subs->last_frame_number =
1702                         usb_get_current_frame_number(subs->dev) & 0xff;
1703         }
1704
1705  out:
1706         spin_unlock_irqrestore(&subs->lock, flags);
1707 }
1708
1709 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1710                                               int cmd)
1711 {
1712         struct snd_usb_substream *subs = substream->runtime->private_data;
1713
1714         switch (cmd) {
1715         case SNDRV_PCM_TRIGGER_START:
1716                 subs->trigger_tstamp_pending_update = true;
1717                 /* fall through */
1718         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1719                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1720                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1721                 subs->running = 1;
1722                 return 0;
1723         case SNDRV_PCM_TRIGGER_STOP:
1724                 stop_endpoints(subs, false);
1725                 subs->running = 0;
1726                 return 0;
1727         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1728                 subs->data_endpoint->prepare_data_urb = NULL;
1729                 /* keep retire_data_urb for delay calculation */
1730                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1731                 subs->running = 0;
1732                 return 0;
1733         }
1734
1735         return -EINVAL;
1736 }
1737
1738 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1739                                              int cmd)
1740 {
1741         int err;
1742         struct snd_usb_substream *subs = substream->runtime->private_data;
1743
1744         switch (cmd) {
1745         case SNDRV_PCM_TRIGGER_START:
1746                 err = start_endpoints(subs);
1747                 if (err < 0)
1748                         return err;
1749
1750                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1751                 subs->running = 1;
1752                 return 0;
1753         case SNDRV_PCM_TRIGGER_STOP:
1754                 stop_endpoints(subs, false);
1755                 subs->running = 0;
1756                 return 0;
1757         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1758                 subs->data_endpoint->retire_data_urb = NULL;
1759                 subs->running = 0;
1760                 return 0;
1761         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1762                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1763                 subs->running = 1;
1764                 return 0;
1765         }
1766
1767         return -EINVAL;
1768 }
1769
1770 static const struct snd_pcm_ops snd_usb_playback_ops = {
1771         .open =         snd_usb_pcm_open,
1772         .close =        snd_usb_pcm_close,
1773         .ioctl =        snd_pcm_lib_ioctl,
1774         .hw_params =    snd_usb_hw_params,
1775         .hw_free =      snd_usb_hw_free,
1776         .prepare =      snd_usb_pcm_prepare,
1777         .trigger =      snd_usb_substream_playback_trigger,
1778         .pointer =      snd_usb_pcm_pointer,
1779         .page =         snd_pcm_lib_get_vmalloc_page,
1780 };
1781
1782 static const struct snd_pcm_ops snd_usb_capture_ops = {
1783         .open =         snd_usb_pcm_open,
1784         .close =        snd_usb_pcm_close,
1785         .ioctl =        snd_pcm_lib_ioctl,
1786         .hw_params =    snd_usb_hw_params,
1787         .hw_free =      snd_usb_hw_free,
1788         .prepare =      snd_usb_pcm_prepare,
1789         .trigger =      snd_usb_substream_capture_trigger,
1790         .pointer =      snd_usb_pcm_pointer,
1791         .page =         snd_pcm_lib_get_vmalloc_page,
1792 };
1793
1794 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1795         .open =         snd_usb_pcm_open,
1796         .close =        snd_usb_pcm_close,
1797         .ioctl =        snd_pcm_lib_ioctl,
1798         .hw_params =    snd_usb_hw_params,
1799         .hw_free =      snd_usb_hw_free,
1800         .prepare =      snd_usb_pcm_prepare,
1801         .trigger =      snd_usb_substream_playback_trigger,
1802         .pointer =      snd_usb_pcm_pointer,
1803         .page =         snd_pcm_sgbuf_ops_page,
1804 };
1805
1806 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1807         .open =         snd_usb_pcm_open,
1808         .close =        snd_usb_pcm_close,
1809         .ioctl =        snd_pcm_lib_ioctl,
1810         .hw_params =    snd_usb_hw_params,
1811         .hw_free =      snd_usb_hw_free,
1812         .prepare =      snd_usb_pcm_prepare,
1813         .trigger =      snd_usb_substream_capture_trigger,
1814         .pointer =      snd_usb_pcm_pointer,
1815         .page =         snd_pcm_sgbuf_ops_page,
1816 };
1817
1818 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1819 {
1820         const struct snd_pcm_ops *ops;
1821
1822         if (snd_usb_use_vmalloc)
1823                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1824                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1825         else
1826                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1827                         &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1828         snd_pcm_set_ops(pcm, stream, ops);
1829 }
1830
1831 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1832 {
1833         struct snd_pcm *pcm = subs->stream->pcm;
1834         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1835         struct device *dev = subs->dev->bus->controller;
1836
1837         if (!snd_usb_use_vmalloc)
1838                 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1839                                               dev, 64*1024, 512*1024);
1840 }