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 sync_pending_stops(struct snd_usb_substream *subs)
 264 {
 265         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 266         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 267 }
 268
 269 static void stop_endpoints(struct snd_usb_substream *subs)
 270 {
 271         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 272                 snd_usb_endpoint_stop(subs->sync_endpoint);
 273
 274         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 275                 snd_usb_endpoint_stop(subs->data_endpoint);
 276 }
 277
 278 /* PCM sync_stop callback */
 279 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 280 {
 281         struct snd_usb_substream *subs = substream->runtime->private_data;
 282
 283         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 284                 sync_pending_stops(subs);
 285                 snd_usb_unlock_shutdown(subs->stream->chip);
 286         }
 287         return 0;
 288 }
 289
 290 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 291                                      unsigned int altsetting,
 292                                      struct usb_host_interface **alts,
 293                                      unsigned int *ep)
 294 {
 295         struct usb_interface *iface;
 296         struct usb_interface_descriptor *altsd;
 297         struct usb_endpoint_descriptor *epd;
 298
 299         iface = usb_ifnum_to_if(dev, ifnum);
 300         if (!iface || iface->num_altsetting < altsetting + 1)
 301                 return -ENOENT;
 302         *alts = &iface->altsetting[altsetting];
 303         altsd = get_iface_desc(*alts);
 304         if (altsd->bAlternateSetting != altsetting ||
 305             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 306             (altsd->bInterfaceSubClass != 2 &&
 307              altsd->bInterfaceProtocol != 2   ) ||
 308             altsd->bNumEndpoints < 1)
 309                 return -ENOENT;
 310         epd = get_endpoint(*alts, 0);
 311         if (!usb_endpoint_is_isoc_in(epd) ||
 312             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 313                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 314                 return -ENOENT;
 315         *ep = epd->bEndpointAddress;
 316         return 0;
 317 }
 318
 319 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 320  * applies. Returns 1 if a quirk was found.
 321  */
 322 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 323                                          struct usb_device *dev,
 324                                          struct usb_interface_descriptor *altsd,
 325                                          unsigned int attr)
 326 {
 327         struct usb_host_interface *alts;
 328         struct usb_interface *iface;
 329         unsigned int ep;
 330         unsigned int ifnum;
 331
 332         /* Implicit feedback sync EPs consumers are always playback EPs */
 333         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 334                 return 0;
 335
 336         switch (subs->stream->chip->usb_id) {
 337         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 338         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 339                 ep = 0x81;
 340                 ifnum = 3;
 341                 goto add_sync_ep_from_ifnum;
 342         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 343         case USB_ID(0x0763, 0x2081):
 344                 ep = 0x81;
 345                 ifnum = 2;
 346                 goto add_sync_ep_from_ifnum;
 347         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 348                 ep = 0x86;
 349                 ifnum = 2;
 350                 goto add_sync_ep_from_ifnum;
 351         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 352                 ep = 0x81;
 353                 ifnum = 2;
 354                 goto add_sync_ep_from_ifnum;
 355         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 356         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 357                 ep = 0x81;
 358                 ifnum = 1;
 359                 goto add_sync_ep_from_ifnum;
 360         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
 361                 ep = 0x84;
 362                 ifnum = 0;
 363                 goto add_sync_ep_from_ifnum;
 364         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 365                 /* BOSS Katana amplifiers do not need quirks */
 366                 return 0;
 367         }
 368
 369         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 370             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 371             altsd->bInterfaceProtocol == 2 &&
 372             altsd->bNumEndpoints == 1 &&
 373             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 374             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 375                                       altsd->bAlternateSetting,
 376                                       &alts, &ep) >= 0) {
 377                 goto add_sync_ep;
 378         }
 379
 380         /* No quirk */
 381         return 0;
 382
 383 add_sync_ep_from_ifnum:
 384         iface = usb_ifnum_to_if(dev, ifnum);
 385
 386         if (!iface || iface->num_altsetting == 0)
 387                 return -EINVAL;
 388
 389         alts = &iface->altsetting[1];
 390
 391 add_sync_ep:
 392         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 393                                                    alts, ep, !subs->direction,
 394                                                    SND_USB_ENDPOINT_TYPE_DATA);
 395         if (!subs->sync_endpoint)
 396                 return -EINVAL;
 397
 398         subs->data_endpoint->sync_master = subs->sync_endpoint;
 399
 400         return 1;
 401 }
 402
 403 static int set_sync_endpoint(struct snd_usb_substream *subs,
 404                              struct audioformat *fmt,
 405                              struct usb_device *dev,
 406                              struct usb_host_interface *alts,
 407                              struct usb_interface_descriptor *altsd)
 408 {
 409         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 410         unsigned int ep, attr;
 411         bool implicit_fb;
 412         int err;
 413
 414         /* we need a sync pipe in async OUT or adaptive IN mode */
 415         /* check the number of EP, since some devices have broken
 416          * descriptors which fool us.  if it has only one EP,
 417          * assume it as adaptive-out or sync-in.
 418          */
 419         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 420
 421         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 422                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 423
 424                 /*
 425                  * In these modes the notion of sync_endpoint is irrelevant.
 426                  * Reset pointers to avoid using stale data from previously
 427                  * used settings, e.g. when configuration and endpoints were
 428                  * changed
 429                  */
 430
 431                 subs->sync_endpoint = NULL;
 432                 subs->data_endpoint->sync_master = NULL;
 433         }
 434
 435         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 436         if (err < 0)
 437                 return err;
 438
 439         /* endpoint set by quirk */
 440         if (err > 0)
 441                 return 0;
 442
 443         if (altsd->bNumEndpoints < 2)
 444                 return 0;
 445
 446         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 447                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 448             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 449                 return 0;
 450
 451         /*
 452          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 453          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 454          * error fall back to SYNC mode and don't create sync endpoint
 455          */
 456
 457         /* check sync-pipe endpoint */
 458         /* ... and check descriptor size before accessing bSynchAddress
 459            because there is a version of the SB Audigy 2 NX firmware lacking
 460            the audio fields in the endpoint descriptors */
 461         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 462             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 463              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 464                 dev_err(&dev->dev,
 465                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 466                            fmt->iface, fmt->altsetting,
 467                            get_endpoint(alts, 1)->bmAttributes,
 468                            get_endpoint(alts, 1)->bLength,
 469                            get_endpoint(alts, 1)->bSynchAddress);
 470                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 471                         return 0;
 472                 return -EINVAL;
 473         }
 474         ep = get_endpoint(alts, 1)->bEndpointAddress;
 475         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 476             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 477             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 478              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 479                 dev_err(&dev->dev,
 480                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 481                            fmt->iface, fmt->altsetting,
 482                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 483                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 484                         return 0;
 485                 return -EINVAL;
 486         }
 487
 488         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 489                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 490
 491         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 492                                                    alts, ep, !subs->direction,
 493                                                    implicit_fb ?
 494                                                         SND_USB_ENDPOINT_TYPE_DATA :
 495                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 496         if (!subs->sync_endpoint) {
 497                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 498                         return 0;
 499                 return -EINVAL;
 500         }
 501
 502         subs->data_endpoint->sync_master = subs->sync_endpoint;
 503
 504         return 0;
 505 }
 506
 507 /*
 508  * find a matching format and set up the interface
 509  */
 510 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 511 {
 512         struct usb_device *dev = subs->dev;
 513         struct usb_host_interface *alts;
 514         struct usb_interface_descriptor *altsd;
 515         struct usb_interface *iface;
 516         int err;
 517
 518         iface = usb_ifnum_to_if(dev, fmt->iface);
 519         if (WARN_ON(!iface))
 520                 return -EINVAL;
 521         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 522         if (WARN_ON(!alts))
 523                 return -EINVAL;
 524         altsd = get_iface_desc(alts);
 525
 526         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 527                 return 0;
 528
 529         /* close the old interface */
 530         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 531                 if (!subs->stream->chip->keep_iface) {
 532                         err = usb_set_interface(subs->dev, subs->interface, 0);
 533                         if (err < 0) {
 534                                 dev_err(&dev->dev,
 535                                         "%d:%d: return to setting 0 failed (%d)\n",
 536                                         fmt->iface, fmt->altsetting, err);
 537                                 return -EIO;
 538                         }
 539                 }
 540                 subs->interface = -1;
 541                 subs->altset_idx = 0;
 542         }
 543
 544         if (subs->need_setup_fmt)
 545                 subs->need_setup_fmt = false;
 546
 547         /* set interface */
 548         if (iface->cur_altsetting != alts) {
 549                 err = snd_usb_select_mode_quirk(subs, fmt);
 550                 if (err < 0)
 551                         return -EIO;
 552
 553                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 554                 if (err < 0) {
 555                         dev_err(&dev->dev,
 556                                 "%d:%d: usb_set_interface failed (%d)\n",
 557                                 fmt->iface, fmt->altsetting, err);
 558                         return -EIO;
 559                 }
 560                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 561                         fmt->iface, fmt->altsetting);
 562                 snd_usb_set_interface_quirk(dev);
 563         }
 564
 565         subs->interface = fmt->iface;
 566         subs->altset_idx = fmt->altset_idx;
 567         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 568                                                    alts, fmt->endpoint, subs->direction,
 569                                                    SND_USB_ENDPOINT_TYPE_DATA);
 570
 571         if (!subs->data_endpoint)
 572                 return -EINVAL;
 573
 574         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 575         if (err < 0)
 576                 return err;
 577
 578         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 579         if (err < 0)
 580                 return err;
 581
 582         subs->cur_audiofmt = fmt;
 583
 584         snd_usb_set_format_quirk(subs, fmt);
 585
 586         return 0;
 587 }
 588
 589 /*
 590  * Return the score of matching two audioformats.
 591  * Veto the audioformat if:
 592  * - It has no channels for some reason.
 593  * - Requested PCM format is not supported.
 594  * - Requested sample rate is not supported.
 595  */
 596 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 597                                        struct audioformat *fp,
 598                                        struct audioformat *match, int rate,
 599                                        snd_pcm_format_t pcm_format)
 600 {
 601         int i;
 602         int score = 0;
 603
 604         if (fp->channels < 1) {
 605                 dev_dbg(&subs->dev->dev,
 606                         "%s: (fmt @%p) no channels\n", __func__, fp);
 607                 return 0;
 608         }
 609
 610         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 611                 dev_dbg(&subs->dev->dev,
 612                         "%s: (fmt @%p) no match for format %d\n", __func__,
 613                         fp, pcm_format);
 614                 return 0;
 615         }
 616
 617         for (i = 0; i < fp->nr_rates; i++) {
 618                 if (fp->rate_table[i] == rate) {
 619                         score++;
 620                         break;
 621                 }
 622         }
 623         if (!score) {
 624                 dev_dbg(&subs->dev->dev,
 625                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 626                         fp, rate);
 627                 return 0;
 628         }
 629
 630         if (fp->channels == match->channels)
 631                 score++;
 632
 633         dev_dbg(&subs->dev->dev,
 634                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 635
 636         return score;
 637 }
 638
 639 /*
 640  * Configure the sync ep using the rate and pcm format of the data ep.
 641  */
 642 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 643 {
 644         int ret;
 645         struct audioformat *fp;
 646         struct audioformat *sync_fp = NULL;
 647         int cur_score = 0;
 648         int sync_period_bytes = subs->period_bytes;
 649         struct snd_usb_substream *sync_subs =
 650                 &subs->stream->substream[subs->direction ^ 1];
 651
 652         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 653             !subs->stream)
 654                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 655                                                    subs->pcm_format,
 656                                                    subs->channels,
 657                                                    subs->period_bytes,
 658                                                    0, 0,
 659                                                    subs->cur_rate,
 660                                                    subs->cur_audiofmt,
 661                                                    NULL);
 662
 663         /* Try to find the best matching audioformat. */
 664         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 665                 int score = match_endpoint_audioformats(subs,
 666                                                         fp, subs->cur_audiofmt,
 667                         subs->cur_rate, subs->pcm_format);
 668
 669                 if (score > cur_score) {
 670                         sync_fp = fp;
 671                         cur_score = score;
 672                 }
 673         }
 674
 675         if (unlikely(sync_fp == NULL)) {
 676                 dev_err(&subs->dev->dev,
 677                         "%s: no valid audioformat for sync ep %x found\n",
 678                         __func__, sync_subs->ep_num);
 679                 return -EINVAL;
 680         }
 681
 682         /*
 683          * Recalculate the period bytes if channel number differ between
 684          * data and sync ep audioformat.
 685          */
 686         if (sync_fp->channels != subs->channels) {
 687                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 688                         sync_fp->channels;
 689                 dev_dbg(&subs->dev->dev,
 690                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 691                         __func__, subs->period_bytes, sync_period_bytes);
 692         }
 693
 694         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 695                                           subs->pcm_format,
 696                                           sync_fp->channels,
 697                                           sync_period_bytes,
 698                                           0, 0,
 699                                           subs->cur_rate,
 700                                           sync_fp,
 701                                           NULL);
 702
 703         return ret;
 704 }
 705
 706 /*
 707  * configure endpoint params
 708  *
 709  * called  during initial setup and upon resume
 710  */
 711 static int configure_endpoint(struct snd_usb_substream *subs)
 712 {
 713         int ret;
 714
 715         /* format changed */
 716         stop_endpoints(subs);
 717         sync_pending_stops(subs);
 718         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 719                                           subs->pcm_format,
 720                                           subs->channels,
 721                                           subs->period_bytes,
 722                                           subs->period_frames,
 723                                           subs->buffer_periods,
 724                                           subs->cur_rate,
 725                                           subs->cur_audiofmt,
 726                                           subs->sync_endpoint);
 727         if (ret < 0)
 728                 return ret;
 729
 730         if (subs->sync_endpoint)
 731                 ret = configure_sync_endpoint(subs);
 732
 733         return ret;
 734 }
 735
 736 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 737 {
 738         int ret;
 739
 740         if (!subs->str_pd)
 741                 return 0;
 742
 743         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 744         if (ret < 0) {
 745                 dev_err(&subs->dev->dev,
 746                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 747                         subs->str_pd->pd_id, state, ret);
 748                 return ret;
 749         }
 750
 751         return 0;
 752 }
 753
 754 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 755 {
 756         int ret;
 757
 758         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 759         if (ret < 0)
 760                 return ret;
 761
 762         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 763         if (ret < 0)
 764                 return ret;
 765
 766         return 0;
 767 }
 768
 769 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 770 {
 771         int ret;
 772
 773         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 774         if (ret < 0)
 775                 return ret;
 776
 777         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 778         if (ret < 0)
 779                 return ret;
 780
 781         return 0;
 782 }
 783
 784 /*
 785  * hw_params callback
 786  *
 787  * allocate a buffer and set the given audio format.
 788  *
 789  * so far we use a physically linear buffer although packetize transfer
 790  * doesn't need a continuous area.
 791  * if sg buffer is supported on the later version of alsa, we'll follow
 792  * that.
 793  */
 794 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 795                              struct snd_pcm_hw_params *hw_params)
 796 {
 797         struct snd_usb_substream *subs = substream->runtime->private_data;
 798         struct audioformat *fmt;
 799         int ret;
 800
 801         ret = snd_media_start_pipeline(subs);
 802         if (ret)
 803                 return ret;
 804
 805         subs->pcm_format = params_format(hw_params);
 806         subs->period_bytes = params_period_bytes(hw_params);
 807         subs->period_frames = params_period_size(hw_params);
 808         subs->buffer_periods = params_periods(hw_params);
 809         subs->channels = params_channels(hw_params);
 810         subs->cur_rate = params_rate(hw_params);
 811
 812         fmt = find_format(subs);
 813         if (!fmt) {
 814                 dev_dbg(&subs->dev->dev,
 815                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 816                            subs->pcm_format, subs->cur_rate, subs->channels);
 817                 ret = -EINVAL;
 818                 goto stop_pipeline;
 819         }
 820
 821         ret = snd_usb_lock_shutdown(subs->stream->chip);
 822         if (ret < 0)
 823                 goto stop_pipeline;
 824
 825         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 826         if (ret < 0)
 827                 goto unlock;
 828
 829         ret = set_format(subs, fmt);
 830         if (ret < 0)
 831                 goto unlock;
 832
 833         subs->interface = fmt->iface;
 834         subs->altset_idx = fmt->altset_idx;
 835         subs->need_setup_ep = true;
 836
 837  unlock:
 838         snd_usb_unlock_shutdown(subs->stream->chip);
 839         if (ret < 0)
 840                 goto stop_pipeline;
 841         return ret;
 842
 843  stop_pipeline:
 844         snd_media_stop_pipeline(subs);
 845         return ret;
 846 }
 847
 848 /*
 849  * hw_free callback
 850  *
 851  * reset the audio format and release the buffer
 852  */
 853 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 854 {
 855         struct snd_usb_substream *subs = substream->runtime->private_data;
 856
 857         snd_media_stop_pipeline(subs);
 858         subs->cur_audiofmt = NULL;
 859         subs->cur_rate = 0;
 860         subs->period_bytes = 0;
 861         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 862                 stop_endpoints(subs);
 863                 sync_pending_stops(subs);
 864                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 865                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 866                 snd_usb_unlock_shutdown(subs->stream->chip);
 867         }
 868
 869         return 0;
 870 }
 871
 872 /*
 873  * prepare callback
 874  *
 875  * only a few subtle things...
 876  */
 877 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 878 {
 879         struct snd_pcm_runtime *runtime = substream->runtime;
 880         struct snd_usb_substream *subs = runtime->private_data;
 881         struct usb_host_interface *alts;
 882         struct usb_interface *iface;
 883         int ret;
 884
 885         if (! subs->cur_audiofmt) {
 886                 dev_err(&subs->dev->dev, "no format is specified!\n");
 887                 return -ENXIO;
 888         }
 889
 890         ret = snd_usb_lock_shutdown(subs->stream->chip);
 891         if (ret < 0)
 892                 return ret;
 893         if (snd_BUG_ON(!subs->data_endpoint)) {
 894                 ret = -EIO;
 895                 goto unlock;
 896         }
 897
 898         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 899         if (ret < 0)
 900                 goto unlock;
 901
 902         ret = set_format(subs, subs->cur_audiofmt);
 903         if (ret < 0)
 904                 goto unlock;
 905
 906         if (subs->need_setup_ep) {
 907
 908                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 909                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 910                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 911                                                subs->cur_audiofmt->iface,
 912                                                alts,
 913                                                subs->cur_audiofmt,
 914                                                subs->cur_rate);
 915                 if (ret < 0)
 916                         goto unlock;
 917
 918                 ret = configure_endpoint(subs);
 919                 if (ret < 0)
 920                         goto unlock;
 921                 subs->need_setup_ep = false;
 922         }
 923
 924         /* some unit conversions in runtime */
 925         subs->data_endpoint->maxframesize =
 926                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 927         subs->data_endpoint->curframesize =
 928                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 929
 930         /* reset the pointer */
 931         subs->hwptr_done = 0;
 932         subs->transfer_done = 0;
 933         subs->last_delay = 0;
 934         subs->last_frame_number = 0;
 935         runtime->delay = 0;
 936
 937         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 938          * updates for all URBs would happen at the same time when starting */
 939         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 940                 ret = start_endpoints(subs);
 941
 942  unlock:
 943         snd_usb_unlock_shutdown(subs->stream->chip);
 944         return ret;
 945 }
 946
 947 static const struct snd_pcm_hardware snd_usb_hardware =
 948 {
 949         .info =                 SNDRV_PCM_INFO_MMAP |
 950                                 SNDRV_PCM_INFO_MMAP_VALID |
 951                                 SNDRV_PCM_INFO_BATCH |
 952                                 SNDRV_PCM_INFO_INTERLEAVED |
 953                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 954                                 SNDRV_PCM_INFO_PAUSE,
 955         .buffer_bytes_max =     1024 * 1024,
 956         .period_bytes_min =     64,
 957         .period_bytes_max =     512 * 1024,
 958         .periods_min =          2,
 959         .periods_max =          1024,
 960 };
 961
 962 static int hw_check_valid_format(struct snd_usb_substream *subs,
 963                                  struct snd_pcm_hw_params *params,
 964                                  struct audioformat *fp)
 965 {
 966         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 967         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 968         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 969         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 970         struct snd_mask check_fmts;
 971         unsigned int ptime;
 972
 973         /* check the format */
 974         snd_mask_none(&check_fmts);
 975         check_fmts.bits[0] = (u32)fp->formats;
 976         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 977         snd_mask_intersect(&check_fmts, fmts);
 978         if (snd_mask_empty(&check_fmts)) {
 979                 hwc_debug("   > check: no supported format %d\n", fp->format);
 980                 return 0;
 981         }
 982         /* check the channels */
 983         if (fp->channels < ct->min || fp->channels > ct->max) {
 984                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 985                 return 0;
 986         }
 987         /* check the rate is within the range */
 988         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 989                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 990                 return 0;
 991         }
 992         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 993                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 994                 return 0;
 995         }
 996         /* check whether the period time is >= the data packet interval */
 997         if (subs->speed != USB_SPEED_FULL) {
 998                 ptime = 125 * (1 << fp->datainterval);
 999                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1000                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1001                         return 0;
1002                 }
1003         }
1004         return 1;
1005 }
1006
1007 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1008                         struct snd_pcm_hw_rule *rule)
1009 {
1010         struct snd_usb_substream *subs = rule->private;
1011         struct audioformat *fp;
1012         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1013         unsigned int rmin, rmax;
1014         int changed;
1015
1016         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1017         changed = 0;
1018         rmin = rmax = 0;
1019         list_for_each_entry(fp, &subs->fmt_list, list) {
1020                 if (!hw_check_valid_format(subs, params, fp))
1021                         continue;
1022                 if (changed++) {
1023                         if (rmin > fp->rate_min)
1024                                 rmin = fp->rate_min;
1025                         if (rmax < fp->rate_max)
1026                                 rmax = fp->rate_max;
1027                 } else {
1028                         rmin = fp->rate_min;
1029                         rmax = fp->rate_max;
1030                 }
1031         }
1032
1033         if (!changed) {
1034                 hwc_debug("  --> get empty\n");
1035                 it->empty = 1;
1036                 return -EINVAL;
1037         }
1038
1039         changed = 0;
1040         if (it->min < rmin) {
1041                 it->min = rmin;
1042                 it->openmin = 0;
1043                 changed = 1;
1044         }
1045         if (it->max > rmax) {
1046                 it->max = rmax;
1047                 it->openmax = 0;
1048                 changed = 1;
1049         }
1050         if (snd_interval_checkempty(it)) {
1051                 it->empty = 1;
1052                 return -EINVAL;
1053         }
1054         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1055         return changed;
1056 }
1057
1058
1059 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1060                             struct snd_pcm_hw_rule *rule)
1061 {
1062         struct snd_usb_substream *subs = rule->private;
1063         struct audioformat *fp;
1064         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1065         unsigned int rmin, rmax;
1066         int changed;
1067
1068         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1069         changed = 0;
1070         rmin = rmax = 0;
1071         list_for_each_entry(fp, &subs->fmt_list, list) {
1072                 if (!hw_check_valid_format(subs, params, fp))
1073                         continue;
1074                 if (changed++) {
1075                         if (rmin > fp->channels)
1076                                 rmin = fp->channels;
1077                         if (rmax < fp->channels)
1078                                 rmax = fp->channels;
1079                 } else {
1080                         rmin = fp->channels;
1081                         rmax = fp->channels;
1082                 }
1083         }
1084
1085         if (!changed) {
1086                 hwc_debug("  --> get empty\n");
1087                 it->empty = 1;
1088                 return -EINVAL;
1089         }
1090
1091         changed = 0;
1092         if (it->min < rmin) {
1093                 it->min = rmin;
1094                 it->openmin = 0;
1095                 changed = 1;
1096         }
1097         if (it->max > rmax) {
1098                 it->max = rmax;
1099                 it->openmax = 0;
1100                 changed = 1;
1101         }
1102         if (snd_interval_checkempty(it)) {
1103                 it->empty = 1;
1104                 return -EINVAL;
1105         }
1106         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1107         return changed;
1108 }
1109
1110 static int hw_rule_format(struct snd_pcm_hw_params *params,
1111                           struct snd_pcm_hw_rule *rule)
1112 {
1113         struct snd_usb_substream *subs = rule->private;
1114         struct audioformat *fp;
1115         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1116         u64 fbits;
1117         u32 oldbits[2];
1118         int changed;
1119
1120         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1121         fbits = 0;
1122         list_for_each_entry(fp, &subs->fmt_list, list) {
1123                 if (!hw_check_valid_format(subs, params, fp))
1124                         continue;
1125                 fbits |= fp->formats;
1126         }
1127
1128         oldbits[0] = fmt->bits[0];
1129         oldbits[1] = fmt->bits[1];
1130         fmt->bits[0] &= (u32)fbits;
1131         fmt->bits[1] &= (u32)(fbits >> 32);
1132         if (!fmt->bits[0] && !fmt->bits[1]) {
1133                 hwc_debug("  --> get empty\n");
1134                 return -EINVAL;
1135         }
1136         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1137         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1138         return changed;
1139 }
1140
1141 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1142                                struct snd_pcm_hw_rule *rule)
1143 {
1144         struct snd_usb_substream *subs = rule->private;
1145         struct audioformat *fp;
1146         struct snd_interval *it;
1147         unsigned char min_datainterval;
1148         unsigned int pmin;
1149         int changed;
1150
1151         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1152         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1153         min_datainterval = 0xff;
1154         list_for_each_entry(fp, &subs->fmt_list, list) {
1155                 if (!hw_check_valid_format(subs, params, fp))
1156                         continue;
1157                 min_datainterval = min(min_datainterval, fp->datainterval);
1158         }
1159         if (min_datainterval == 0xff) {
1160                 hwc_debug("  --> get empty\n");
1161                 it->empty = 1;
1162                 return -EINVAL;
1163         }
1164         pmin = 125 * (1 << min_datainterval);
1165         changed = 0;
1166         if (it->min < pmin) {
1167                 it->min = pmin;
1168                 it->openmin = 0;
1169                 changed = 1;
1170         }
1171         if (snd_interval_checkempty(it)) {
1172                 it->empty = 1;
1173                 return -EINVAL;
1174         }
1175         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1176         return changed;
1177 }
1178
1179 /*
1180  *  If the device supports unusual bit rates, does the request meet these?
1181  */
1182 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1183                                   struct snd_usb_substream *subs)
1184 {
1185         struct audioformat *fp;
1186         int *rate_list;
1187         int count = 0, needs_knot = 0;
1188         int err;
1189
1190         kfree(subs->rate_list.list);
1191         subs->rate_list.list = NULL;
1192
1193         list_for_each_entry(fp, &subs->fmt_list, list) {
1194                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1195                         return 0;
1196                 count += fp->nr_rates;
1197                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1198                         needs_knot = 1;
1199         }
1200         if (!needs_knot)
1201                 return 0;
1202
1203         subs->rate_list.list = rate_list =
1204                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1205         if (!subs->rate_list.list)
1206                 return -ENOMEM;
1207         subs->rate_list.count = count;
1208         subs->rate_list.mask = 0;
1209         count = 0;
1210         list_for_each_entry(fp, &subs->fmt_list, list) {
1211                 int i;
1212                 for (i = 0; i < fp->nr_rates; i++)
1213                         rate_list[count++] = fp->rate_table[i];
1214         }
1215         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1216                                          &subs->rate_list);
1217         if (err < 0)
1218                 return err;
1219
1220         return 0;
1221 }
1222
1223
1224 /*
1225  * set up the runtime hardware information.
1226  */
1227
1228 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1229 {
1230         struct audioformat *fp;
1231         unsigned int pt, ptmin;
1232         int param_period_time_if_needed;
1233         int err;
1234
1235         runtime->hw.formats = subs->formats;
1236
1237         runtime->hw.rate_min = 0x7fffffff;
1238         runtime->hw.rate_max = 0;
1239         runtime->hw.channels_min = 256;
1240         runtime->hw.channels_max = 0;
1241         runtime->hw.rates = 0;
1242         ptmin = UINT_MAX;
1243         /* check min/max rates and channels */
1244         list_for_each_entry(fp, &subs->fmt_list, list) {
1245                 runtime->hw.rates |= fp->rates;
1246                 if (runtime->hw.rate_min > fp->rate_min)
1247                         runtime->hw.rate_min = fp->rate_min;
1248                 if (runtime->hw.rate_max < fp->rate_max)
1249                         runtime->hw.rate_max = fp->rate_max;
1250                 if (runtime->hw.channels_min > fp->channels)
1251                         runtime->hw.channels_min = fp->channels;
1252                 if (runtime->hw.channels_max < fp->channels)
1253                         runtime->hw.channels_max = fp->channels;
1254                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1255                         /* FIXME: there might be more than one audio formats... */
1256                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1257                                 fp->frame_size;
1258                 }
1259                 pt = 125 * (1 << fp->datainterval);
1260                 ptmin = min(ptmin, pt);
1261         }
1262
1263         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1264         if (subs->speed == USB_SPEED_FULL)
1265                 /* full speed devices have fixed data packet interval */
1266                 ptmin = 1000;
1267         if (ptmin == 1000)
1268                 /* if period time doesn't go below 1 ms, no rules needed */
1269                 param_period_time_if_needed = -1;
1270
1271         err = snd_pcm_hw_constraint_minmax(runtime,
1272                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1273                                            ptmin, UINT_MAX);
1274         if (err < 0)
1275                 return err;
1276
1277         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1278                                   hw_rule_rate, subs,
1279                                   SNDRV_PCM_HW_PARAM_FORMAT,
1280                                   SNDRV_PCM_HW_PARAM_CHANNELS,
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_CHANNELS,
1286                                   hw_rule_channels, subs,
1287                                   SNDRV_PCM_HW_PARAM_FORMAT,
1288                                   SNDRV_PCM_HW_PARAM_RATE,
1289                                   param_period_time_if_needed,
1290                                   -1);
1291         if (err < 0)
1292                 return err;
1293         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1294                                   hw_rule_format, subs,
1295                                   SNDRV_PCM_HW_PARAM_RATE,
1296                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1297                                   param_period_time_if_needed,
1298                                   -1);
1299         if (err < 0)
1300                 return err;
1301         if (param_period_time_if_needed >= 0) {
1302                 err = snd_pcm_hw_rule_add(runtime, 0,
1303                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1304                                           hw_rule_period_time, subs,
1305                                           SNDRV_PCM_HW_PARAM_FORMAT,
1306                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1307                                           SNDRV_PCM_HW_PARAM_RATE,
1308                                           -1);
1309                 if (err < 0)
1310                         return err;
1311         }
1312         err = snd_usb_pcm_check_knot(runtime, subs);
1313         if (err < 0)
1314                 return err;
1315
1316         return snd_usb_autoresume(subs->stream->chip);
1317 }
1318
1319 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1320 {
1321         int direction = substream->stream;
1322         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1323         struct snd_pcm_runtime *runtime = substream->runtime;
1324         struct snd_usb_substream *subs = &as->substream[direction];
1325         int ret;
1326
1327         subs->interface = -1;
1328         subs->altset_idx = 0;
1329         runtime->hw = snd_usb_hardware;
1330         runtime->private_data = subs;
1331         subs->pcm_substream = substream;
1332         /* runtime PM is also done there */
1333
1334         /* initialize DSD/DOP context */
1335         subs->dsd_dop.byte_idx = 0;
1336         subs->dsd_dop.channel = 0;
1337         subs->dsd_dop.marker = 1;
1338
1339         ret = setup_hw_info(runtime, subs);
1340         if (ret == 0) {
1341                 ret = snd_media_stream_init(subs, as->pcm, direction);
1342                 if (ret)
1343                         snd_usb_autosuspend(subs->stream->chip);
1344         }
1345         return ret;
1346 }
1347
1348 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1349 {
1350         int direction = substream->stream;
1351         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1352         struct snd_usb_substream *subs = &as->substream[direction];
1353         int ret;
1354
1355         snd_media_stop_pipeline(subs);
1356
1357         if (!as->chip->keep_iface &&
1358             subs->interface >= 0 &&
1359             !snd_usb_lock_shutdown(subs->stream->chip)) {
1360                 usb_set_interface(subs->dev, subs->interface, 0);
1361                 subs->interface = -1;
1362                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1363                 snd_usb_unlock_shutdown(subs->stream->chip);
1364                 if (ret < 0)
1365                         return ret;
1366         }
1367
1368         subs->pcm_substream = NULL;
1369         snd_usb_autosuspend(subs->stream->chip);
1370
1371         return 0;
1372 }
1373
1374 /* Since a URB can handle only a single linear buffer, we must use double
1375  * buffering when the data to be transferred overflows the buffer boundary.
1376  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1377  * for all URBs.
1378  */
1379 static void retire_capture_urb(struct snd_usb_substream *subs,
1380                                struct urb *urb)
1381 {
1382         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1383         unsigned int stride, frames, bytes, oldptr;
1384         int i, period_elapsed = 0;
1385         unsigned long flags;
1386         unsigned char *cp;
1387         int current_frame_number;
1388
1389         /* read frame number here, update pointer in critical section */
1390         current_frame_number = usb_get_current_frame_number(subs->dev);
1391
1392         stride = runtime->frame_bits >> 3;
1393
1394         for (i = 0; i < urb->number_of_packets; i++) {
1395                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1396                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1397                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1398                                 i, urb->iso_frame_desc[i].status);
1399                         // continue;
1400                 }
1401                 bytes = urb->iso_frame_desc[i].actual_length;
1402                 frames = bytes / stride;
1403                 if (!subs->txfr_quirk)
1404                         bytes = frames * stride;
1405                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1406                         int oldbytes = bytes;
1407                         bytes = frames * stride;
1408                         dev_warn_ratelimited(&subs->dev->dev,
1409                                  "Corrected urb data len. %d->%d\n",
1410                                                         oldbytes, bytes);
1411                 }
1412                 /* update the current pointer */
1413                 spin_lock_irqsave(&subs->lock, flags);
1414                 oldptr = subs->hwptr_done;
1415                 subs->hwptr_done += bytes;
1416                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1417                         subs->hwptr_done -= runtime->buffer_size * stride;
1418                 frames = (bytes + (oldptr % stride)) / stride;
1419                 subs->transfer_done += frames;
1420                 if (subs->transfer_done >= runtime->period_size) {
1421                         subs->transfer_done -= runtime->period_size;
1422                         period_elapsed = 1;
1423                 }
1424                 /* capture delay is by construction limited to one URB,
1425                  * reset delays here
1426                  */
1427                 runtime->delay = subs->last_delay = 0;
1428
1429                 /* realign last_frame_number */
1430                 subs->last_frame_number = current_frame_number;
1431                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1432
1433                 spin_unlock_irqrestore(&subs->lock, flags);
1434                 /* copy a data chunk */
1435                 if (oldptr + bytes > runtime->buffer_size * stride) {
1436                         unsigned int bytes1 =
1437                                         runtime->buffer_size * stride - oldptr;
1438                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1439                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1440                 } else {
1441                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1442                 }
1443         }
1444
1445         if (period_elapsed)
1446                 snd_pcm_period_elapsed(subs->pcm_substream);
1447 }
1448
1449 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1450                                              struct urb *urb, unsigned int bytes)
1451 {
1452         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1453         unsigned int stride = runtime->frame_bits >> 3;
1454         unsigned int dst_idx = 0;
1455         unsigned int src_idx = subs->hwptr_done;
1456         unsigned int wrap = runtime->buffer_size * stride;
1457         u8 *dst = urb->transfer_buffer;
1458         u8 *src = runtime->dma_area;
1459         u8 marker[] = { 0x05, 0xfa };
1460
1461         /*
1462          * The DSP DOP format defines a way to transport DSD samples over
1463          * normal PCM data endpoints. It requires stuffing of marker bytes
1464          * (0x05 and 0xfa, alternating per sample frame), and then expects
1465          * 2 additional bytes of actual payload. The whole frame is stored
1466          * LSB.
1467          *
1468          * Hence, for a stereo transport, the buffer layout looks like this,
1469          * where L refers to left channel samples and R to right.
1470          *
1471          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1472          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1473          *   .....
1474          *
1475          */
1476
1477         while (bytes--) {
1478                 if (++subs->dsd_dop.byte_idx == 3) {
1479                         /* frame boundary? */
1480                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1481                         src_idx += 2;
1482                         subs->dsd_dop.byte_idx = 0;
1483
1484                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1485                                 /* alternate the marker */
1486                                 subs->dsd_dop.marker++;
1487                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1488                                 subs->dsd_dop.channel = 0;
1489                         }
1490                 } else {
1491                         /* stuff the DSD payload */
1492                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1493
1494                         if (subs->cur_audiofmt->dsd_bitrev)
1495                                 dst[dst_idx++] = bitrev8(src[idx]);
1496                         else
1497                                 dst[dst_idx++] = src[idx];
1498
1499                         subs->hwptr_done++;
1500                 }
1501         }
1502         if (subs->hwptr_done >= runtime->buffer_size * stride)
1503                 subs->hwptr_done -= runtime->buffer_size * stride;
1504 }
1505
1506 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1507                         int offset, int stride, unsigned int bytes)
1508 {
1509         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1510
1511         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1512                 /* err, the transferred area goes over buffer boundary. */
1513                 unsigned int bytes1 =
1514                         runtime->buffer_size * stride - subs->hwptr_done;
1515                 memcpy(urb->transfer_buffer + offset,
1516                        runtime->dma_area + subs->hwptr_done, bytes1);
1517                 memcpy(urb->transfer_buffer + offset + bytes1,
1518                        runtime->dma_area, bytes - bytes1);
1519         } else {
1520                 memcpy(urb->transfer_buffer + offset,
1521                        runtime->dma_area + subs->hwptr_done, bytes);
1522         }
1523         subs->hwptr_done += bytes;
1524         if (subs->hwptr_done >= runtime->buffer_size * stride)
1525                 subs->hwptr_done -= runtime->buffer_size * stride;
1526 }
1527
1528 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1529                                       struct urb *urb, int stride,
1530                                       unsigned int bytes)
1531 {
1532         __le32 packet_length;
1533         int i;
1534
1535         /* Put __le32 length descriptor at start of each packet. */
1536         for (i = 0; i < urb->number_of_packets; i++) {
1537                 unsigned int length = urb->iso_frame_desc[i].length;
1538                 unsigned int offset = urb->iso_frame_desc[i].offset;
1539
1540                 packet_length = cpu_to_le32(length);
1541                 offset += i * sizeof(packet_length);
1542                 urb->iso_frame_desc[i].offset = offset;
1543                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1544                 memcpy(urb->transfer_buffer + offset,
1545                        &packet_length, sizeof(packet_length));
1546                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1547                             stride, length);
1548         }
1549         /* Adjust transfer size accordingly. */
1550         bytes += urb->number_of_packets * sizeof(packet_length);
1551         return bytes;
1552 }
1553
1554 static void prepare_playback_urb(struct snd_usb_substream *subs,
1555                                  struct urb *urb)
1556 {
1557         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1558         struct snd_usb_endpoint *ep = subs->data_endpoint;
1559         struct snd_urb_ctx *ctx = urb->context;
1560         unsigned int counts, frames, bytes;
1561         int i, stride, period_elapsed = 0;
1562         unsigned long flags;
1563
1564         stride = runtime->frame_bits >> 3;
1565
1566         frames = 0;
1567         urb->number_of_packets = 0;
1568         spin_lock_irqsave(&subs->lock, flags);
1569         subs->frame_limit += ep->max_urb_frames;
1570         for (i = 0; i < ctx->packets; i++) {
1571                 if (ctx->packet_size[i])
1572                         counts = ctx->packet_size[i];
1573                 else
1574                         counts = snd_usb_endpoint_next_packet_size(ep);
1575
1576                 /* set up descriptor */
1577                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1578                 urb->iso_frame_desc[i].length = counts * ep->stride;
1579                 frames += counts;
1580                 urb->number_of_packets++;
1581                 subs->transfer_done += counts;
1582                 if (subs->transfer_done >= runtime->period_size) {
1583                         subs->transfer_done -= runtime->period_size;
1584                         subs->frame_limit = 0;
1585                         period_elapsed = 1;
1586                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1587                                 if (subs->transfer_done > 0) {
1588                                         /* FIXME: fill-max mode is not
1589                                          * supported yet */
1590                                         frames -= subs->transfer_done;
1591                                         counts -= subs->transfer_done;
1592                                         urb->iso_frame_desc[i].length =
1593                                                 counts * ep->stride;
1594                                         subs->transfer_done = 0;
1595                                 }
1596                                 i++;
1597                                 if (i < ctx->packets) {
1598                                         /* add a transfer delimiter */
1599                                         urb->iso_frame_desc[i].offset =
1600                                                 frames * ep->stride;
1601                                         urb->iso_frame_desc[i].length = 0;
1602                                         urb->number_of_packets++;
1603                                 }
1604                                 break;
1605                         }
1606                 }
1607                 /* finish at the period boundary or after enough frames */
1608                 if ((period_elapsed ||
1609                                 subs->transfer_done >= subs->frame_limit) &&
1610                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1611                         break;
1612         }
1613         bytes = frames * ep->stride;
1614
1615         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1616                      subs->cur_audiofmt->dsd_dop)) {
1617                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1618         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1619                            subs->cur_audiofmt->dsd_bitrev)) {
1620                 /* bit-reverse the bytes */
1621                 u8 *buf = urb->transfer_buffer;
1622                 for (i = 0; i < bytes; i++) {
1623                         int idx = (subs->hwptr_done + i)
1624                                 % (runtime->buffer_size * stride);
1625                         buf[i] = bitrev8(runtime->dma_area[idx]);
1626                 }
1627
1628                 subs->hwptr_done += bytes;
1629                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1630                         subs->hwptr_done -= runtime->buffer_size * stride;
1631         } else {
1632                 /* usual PCM */
1633                 if (!subs->tx_length_quirk)
1634                         copy_to_urb(subs, urb, 0, stride, bytes);
1635                 else
1636                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1637                         /* bytes is now amount of outgoing data */
1638         }
1639
1640         /* update delay with exact number of samples queued */
1641         runtime->delay = subs->last_delay;
1642         runtime->delay += frames;
1643         subs->last_delay = runtime->delay;
1644
1645         /* realign last_frame_number */
1646         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1647         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1648
1649         if (subs->trigger_tstamp_pending_update) {
1650                 /* this is the first actual URB submitted,
1651                  * update trigger timestamp to reflect actual start time
1652                  */
1653                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1654                 subs->trigger_tstamp_pending_update = false;
1655         }
1656
1657         spin_unlock_irqrestore(&subs->lock, flags);
1658         urb->transfer_buffer_length = bytes;
1659         if (period_elapsed)
1660                 snd_pcm_period_elapsed(subs->pcm_substream);
1661 }
1662
1663 /*
1664  * process after playback data complete
1665  * - decrease the delay count again
1666  */
1667 static void retire_playback_urb(struct snd_usb_substream *subs,
1668                                struct urb *urb)
1669 {
1670         unsigned long flags;
1671         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1672         struct snd_usb_endpoint *ep = subs->data_endpoint;
1673         int processed = urb->transfer_buffer_length / ep->stride;
1674         int est_delay;
1675
1676         /* ignore the delay accounting when procssed=0 is given, i.e.
1677          * silent payloads are procssed before handling the actual data
1678          */
1679         if (!processed)
1680                 return;
1681
1682         spin_lock_irqsave(&subs->lock, flags);
1683         if (!subs->last_delay)
1684                 goto out; /* short path */
1685
1686         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1687         /* update delay with exact number of samples played */
1688         if (processed > subs->last_delay)
1689                 subs->last_delay = 0;
1690         else
1691                 subs->last_delay -= processed;
1692         runtime->delay = subs->last_delay;
1693
1694         /*
1695          * Report when delay estimate is off by more than 2ms.
1696          * The error should be lower than 2ms since the estimate relies
1697          * on two reads of a counter updated every ms.
1698          */
1699         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1700                 dev_dbg_ratelimited(&subs->dev->dev,
1701                         "delay: estimated %d, actual %d\n",
1702                         est_delay, subs->last_delay);
1703
1704         if (!subs->running) {
1705                 /* update last_frame_number for delay counting here since
1706                  * prepare_playback_urb won't be called during pause
1707                  */
1708                 subs->last_frame_number =
1709                         usb_get_current_frame_number(subs->dev) & 0xff;
1710         }
1711
1712  out:
1713         spin_unlock_irqrestore(&subs->lock, flags);
1714 }
1715
1716 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1717                                               int cmd)
1718 {
1719         struct snd_usb_substream *subs = substream->runtime->private_data;
1720
1721         switch (cmd) {
1722         case SNDRV_PCM_TRIGGER_START:
1723                 subs->trigger_tstamp_pending_update = true;
1724                 /* fall through */
1725         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1726                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1727                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1728                 subs->running = 1;
1729                 return 0;
1730         case SNDRV_PCM_TRIGGER_STOP:
1731                 stop_endpoints(subs);
1732                 subs->running = 0;
1733                 return 0;
1734         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1735                 subs->data_endpoint->prepare_data_urb = NULL;
1736                 /* keep retire_data_urb for delay calculation */
1737                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1738                 subs->running = 0;
1739                 return 0;
1740         case SNDRV_PCM_TRIGGER_SUSPEND:
1741                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1742                         stop_endpoints(subs);
1743                         subs->need_setup_fmt = true;
1744                         return 0;
1745                 }
1746                 break;
1747         }
1748
1749         return -EINVAL;
1750 }
1751
1752 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1753                                              int cmd)
1754 {
1755         int err;
1756         struct snd_usb_substream *subs = substream->runtime->private_data;
1757
1758         switch (cmd) {
1759         case SNDRV_PCM_TRIGGER_START:
1760                 err = start_endpoints(subs);
1761                 if (err < 0)
1762                         return err;
1763
1764                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1765                 subs->running = 1;
1766                 return 0;
1767         case SNDRV_PCM_TRIGGER_STOP:
1768                 stop_endpoints(subs);
1769                 subs->running = 0;
1770                 return 0;
1771         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1772                 subs->data_endpoint->retire_data_urb = NULL;
1773                 subs->running = 0;
1774                 return 0;
1775         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1776                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1777                 subs->running = 1;
1778                 return 0;
1779         case SNDRV_PCM_TRIGGER_SUSPEND:
1780                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1781                         stop_endpoints(subs);
1782                         subs->need_setup_fmt = true;
1783                         return 0;
1784                 }
1785                 break;
1786         }
1787
1788         return -EINVAL;
1789 }
1790
1791 static const struct snd_pcm_ops snd_usb_playback_ops = {
1792         .open =         snd_usb_pcm_open,
1793         .close =        snd_usb_pcm_close,
1794         .hw_params =    snd_usb_hw_params,
1795         .hw_free =      snd_usb_hw_free,
1796         .prepare =      snd_usb_pcm_prepare,
1797         .trigger =      snd_usb_substream_playback_trigger,
1798         .sync_stop =    snd_usb_pcm_sync_stop,
1799         .pointer =      snd_usb_pcm_pointer,
1800 };
1801
1802 static const struct snd_pcm_ops snd_usb_capture_ops = {
1803         .open =         snd_usb_pcm_open,
1804         .close =        snd_usb_pcm_close,
1805         .hw_params =    snd_usb_hw_params,
1806         .hw_free =      snd_usb_hw_free,
1807         .prepare =      snd_usb_pcm_prepare,
1808         .trigger =      snd_usb_substream_capture_trigger,
1809         .sync_stop =    snd_usb_pcm_sync_stop,
1810         .pointer =      snd_usb_pcm_pointer,
1811 };
1812
1813 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1814 {
1815         const struct snd_pcm_ops *ops;
1816
1817         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1818                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1819         snd_pcm_set_ops(pcm, stream, ops);
1820 }
1821
1822 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1823 {
1824         struct snd_pcm *pcm = subs->stream->pcm;
1825         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1826         struct device *dev = subs->dev->bus->controller;
1827
1828         if (snd_usb_use_vmalloc)
1829                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1830                                            NULL, 0, 0);
1831         else
1832                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1833                                            dev, 64*1024, 512*1024);
1834 }