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(0x07fd, 0x0008): /* MOTU M Series */
 365                 ep = 0x81;
 366                 ifnum = 2;
 367                 goto add_sync_ep_from_ifnum;
 368         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 369                 /* BOSS Katana amplifiers do not need quirks */
 370                 return 0;
 371         }
 372
 373         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 374             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 375             altsd->bInterfaceProtocol == 2 &&
 376             altsd->bNumEndpoints == 1 &&
 377             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 378             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 379                                       altsd->bAlternateSetting,
 380                                       &alts, &ep) >= 0) {
 381                 goto add_sync_ep;
 382         }
 383
 384         /* No quirk */
 385         return 0;
 386
 387 add_sync_ep_from_ifnum:
 388         iface = usb_ifnum_to_if(dev, ifnum);
 389
 390         if (!iface || iface->num_altsetting < 2)
 391                 return -EINVAL;
 392
 393         alts = &iface->altsetting[1];
 394
 395 add_sync_ep:
 396         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 397                                                    alts, ep, !subs->direction,
 398                                                    SND_USB_ENDPOINT_TYPE_DATA);
 399         if (!subs->sync_endpoint)
 400                 return -EINVAL;
 401
 402         subs->data_endpoint->sync_master = subs->sync_endpoint;
 403
 404         return 1;
 405 }
 406
 407 static int set_sync_endpoint(struct snd_usb_substream *subs,
 408                              struct audioformat *fmt,
 409                              struct usb_device *dev,
 410                              struct usb_host_interface *alts,
 411                              struct usb_interface_descriptor *altsd)
 412 {
 413         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 414         unsigned int ep, attr;
 415         bool implicit_fb;
 416         int err;
 417
 418         /* we need a sync pipe in async OUT or adaptive IN mode */
 419         /* check the number of EP, since some devices have broken
 420          * descriptors which fool us.  if it has only one EP,
 421          * assume it as adaptive-out or sync-in.
 422          */
 423         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 424
 425         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 426                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 427
 428                 /*
 429                  * In these modes the notion of sync_endpoint is irrelevant.
 430                  * Reset pointers to avoid using stale data from previously
 431                  * used settings, e.g. when configuration and endpoints were
 432                  * changed
 433                  */
 434
 435                 subs->sync_endpoint = NULL;
 436                 subs->data_endpoint->sync_master = NULL;
 437         }
 438
 439         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 440         if (err < 0)
 441                 return err;
 442
 443         /* endpoint set by quirk */
 444         if (err > 0)
 445                 return 0;
 446
 447         if (altsd->bNumEndpoints < 2)
 448                 return 0;
 449
 450         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 451                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 452             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 453                 return 0;
 454
 455         /*
 456          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 457          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 458          * error fall back to SYNC mode and don't create sync endpoint
 459          */
 460
 461         /* check sync-pipe endpoint */
 462         /* ... and check descriptor size before accessing bSynchAddress
 463            because there is a version of the SB Audigy 2 NX firmware lacking
 464            the audio fields in the endpoint descriptors */
 465         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 466             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 467              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 468                 dev_err(&dev->dev,
 469                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 470                            fmt->iface, fmt->altsetting,
 471                            get_endpoint(alts, 1)->bmAttributes,
 472                            get_endpoint(alts, 1)->bLength,
 473                            get_endpoint(alts, 1)->bSynchAddress);
 474                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 475                         return 0;
 476                 return -EINVAL;
 477         }
 478         ep = get_endpoint(alts, 1)->bEndpointAddress;
 479         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 480             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 481             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 482              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 483                 dev_err(&dev->dev,
 484                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 485                            fmt->iface, fmt->altsetting,
 486                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 487                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 488                         return 0;
 489                 return -EINVAL;
 490         }
 491
 492         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 493                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 494
 495         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 496                                                    alts, ep, !subs->direction,
 497                                                    implicit_fb ?
 498                                                         SND_USB_ENDPOINT_TYPE_DATA :
 499                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 500         if (!subs->sync_endpoint) {
 501                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 502                         return 0;
 503                 return -EINVAL;
 504         }
 505
 506         subs->data_endpoint->sync_master = subs->sync_endpoint;
 507
 508         return 0;
 509 }
 510
 511 /*
 512  * find a matching format and set up the interface
 513  */
 514 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 515 {
 516         struct usb_device *dev = subs->dev;
 517         struct usb_host_interface *alts;
 518         struct usb_interface_descriptor *altsd;
 519         struct usb_interface *iface;
 520         int err;
 521
 522         iface = usb_ifnum_to_if(dev, fmt->iface);
 523         if (WARN_ON(!iface))
 524                 return -EINVAL;
 525         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 526         if (WARN_ON(!alts))
 527                 return -EINVAL;
 528         altsd = get_iface_desc(alts);
 529
 530         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 531                 return 0;
 532
 533         /* close the old interface */
 534         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 535                 if (!subs->stream->chip->keep_iface) {
 536                         err = usb_set_interface(subs->dev, subs->interface, 0);
 537                         if (err < 0) {
 538                                 dev_err(&dev->dev,
 539                                         "%d:%d: return to setting 0 failed (%d)\n",
 540                                         fmt->iface, fmt->altsetting, err);
 541                                 return -EIO;
 542                         }
 543                 }
 544                 subs->interface = -1;
 545                 subs->altset_idx = 0;
 546         }
 547
 548         if (subs->need_setup_fmt)
 549                 subs->need_setup_fmt = false;
 550
 551         /* set interface */
 552         if (iface->cur_altsetting != alts) {
 553                 err = snd_usb_select_mode_quirk(subs, fmt);
 554                 if (err < 0)
 555                         return -EIO;
 556
 557                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 558                 if (err < 0) {
 559                         dev_err(&dev->dev,
 560                                 "%d:%d: usb_set_interface failed (%d)\n",
 561                                 fmt->iface, fmt->altsetting, err);
 562                         return -EIO;
 563                 }
 564                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 565                         fmt->iface, fmt->altsetting);
 566                 snd_usb_set_interface_quirk(dev);
 567         }
 568
 569         subs->interface = fmt->iface;
 570         subs->altset_idx = fmt->altset_idx;
 571         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 572                                                    alts, fmt->endpoint, subs->direction,
 573                                                    SND_USB_ENDPOINT_TYPE_DATA);
 574
 575         if (!subs->data_endpoint)
 576                 return -EINVAL;
 577
 578         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 579         if (err < 0)
 580                 return err;
 581
 582         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 583         if (err < 0)
 584                 return err;
 585
 586         subs->cur_audiofmt = fmt;
 587
 588         snd_usb_set_format_quirk(subs, fmt);
 589
 590         return 0;
 591 }
 592
 593 /*
 594  * Return the score of matching two audioformats.
 595  * Veto the audioformat if:
 596  * - It has no channels for some reason.
 597  * - Requested PCM format is not supported.
 598  * - Requested sample rate is not supported.
 599  */
 600 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 601                                        struct audioformat *fp,
 602                                        struct audioformat *match, int rate,
 603                                        snd_pcm_format_t pcm_format)
 604 {
 605         int i;
 606         int score = 0;
 607
 608         if (fp->channels < 1) {
 609                 dev_dbg(&subs->dev->dev,
 610                         "%s: (fmt @%p) no channels\n", __func__, fp);
 611                 return 0;
 612         }
 613
 614         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 615                 dev_dbg(&subs->dev->dev,
 616                         "%s: (fmt @%p) no match for format %d\n", __func__,
 617                         fp, pcm_format);
 618                 return 0;
 619         }
 620
 621         for (i = 0; i < fp->nr_rates; i++) {
 622                 if (fp->rate_table[i] == rate) {
 623                         score++;
 624                         break;
 625                 }
 626         }
 627         if (!score) {
 628                 dev_dbg(&subs->dev->dev,
 629                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 630                         fp, rate);
 631                 return 0;
 632         }
 633
 634         if (fp->channels == match->channels)
 635                 score++;
 636
 637         dev_dbg(&subs->dev->dev,
 638                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 639
 640         return score;
 641 }
 642
 643 /*
 644  * Configure the sync ep using the rate and pcm format of the data ep.
 645  */
 646 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 647 {
 648         int ret;
 649         struct audioformat *fp;
 650         struct audioformat *sync_fp = NULL;
 651         int cur_score = 0;
 652         int sync_period_bytes = subs->period_bytes;
 653         struct snd_usb_substream *sync_subs =
 654                 &subs->stream->substream[subs->direction ^ 1];
 655
 656         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 657             !subs->stream)
 658                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 659                                                    subs->pcm_format,
 660                                                    subs->channels,
 661                                                    subs->period_bytes,
 662                                                    0, 0,
 663                                                    subs->cur_rate,
 664                                                    subs->cur_audiofmt,
 665                                                    NULL);
 666
 667         /* Try to find the best matching audioformat. */
 668         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 669                 int score = match_endpoint_audioformats(subs,
 670                                                         fp, subs->cur_audiofmt,
 671                         subs->cur_rate, subs->pcm_format);
 672
 673                 if (score > cur_score) {
 674                         sync_fp = fp;
 675                         cur_score = score;
 676                 }
 677         }
 678
 679         if (unlikely(sync_fp == NULL)) {
 680                 dev_err(&subs->dev->dev,
 681                         "%s: no valid audioformat for sync ep %x found\n",
 682                         __func__, sync_subs->ep_num);
 683                 return -EINVAL;
 684         }
 685
 686         /*
 687          * Recalculate the period bytes if channel number differ between
 688          * data and sync ep audioformat.
 689          */
 690         if (sync_fp->channels != subs->channels) {
 691                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 692                         sync_fp->channels;
 693                 dev_dbg(&subs->dev->dev,
 694                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 695                         __func__, subs->period_bytes, sync_period_bytes);
 696         }
 697
 698         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 699                                           subs->pcm_format,
 700                                           sync_fp->channels,
 701                                           sync_period_bytes,
 702                                           0, 0,
 703                                           subs->cur_rate,
 704                                           sync_fp,
 705                                           NULL);
 706
 707         return ret;
 708 }
 709
 710 /*
 711  * configure endpoint params
 712  *
 713  * called  during initial setup and upon resume
 714  */
 715 static int configure_endpoint(struct snd_usb_substream *subs)
 716 {
 717         int ret;
 718
 719         /* format changed */
 720         stop_endpoints(subs);
 721         sync_pending_stops(subs);
 722         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 723                                           subs->pcm_format,
 724                                           subs->channels,
 725                                           subs->period_bytes,
 726                                           subs->period_frames,
 727                                           subs->buffer_periods,
 728                                           subs->cur_rate,
 729                                           subs->cur_audiofmt,
 730                                           subs->sync_endpoint);
 731         if (ret < 0)
 732                 return ret;
 733
 734         if (subs->sync_endpoint)
 735                 ret = configure_sync_endpoint(subs);
 736
 737         return ret;
 738 }
 739
 740 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 741 {
 742         int ret;
 743
 744         if (!subs->str_pd)
 745                 return 0;
 746
 747         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 748         if (ret < 0) {
 749                 dev_err(&subs->dev->dev,
 750                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 751                         subs->str_pd->pd_id, state, ret);
 752                 return ret;
 753         }
 754
 755         return 0;
 756 }
 757
 758 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 759 {
 760         int ret;
 761
 762         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 763         if (ret < 0)
 764                 return ret;
 765
 766         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 767         if (ret < 0)
 768                 return ret;
 769
 770         return 0;
 771 }
 772
 773 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 774 {
 775         int ret;
 776
 777         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 778         if (ret < 0)
 779                 return ret;
 780
 781         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 782         if (ret < 0)
 783                 return ret;
 784
 785         return 0;
 786 }
 787
 788 /*
 789  * hw_params callback
 790  *
 791  * allocate a buffer and set the given audio format.
 792  *
 793  * so far we use a physically linear buffer although packetize transfer
 794  * doesn't need a continuous area.
 795  * if sg buffer is supported on the later version of alsa, we'll follow
 796  * that.
 797  */
 798 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 799                              struct snd_pcm_hw_params *hw_params)
 800 {
 801         struct snd_usb_substream *subs = substream->runtime->private_data;
 802         struct audioformat *fmt;
 803         int ret;
 804
 805         ret = snd_media_start_pipeline(subs);
 806         if (ret)
 807                 return ret;
 808
 809         subs->pcm_format = params_format(hw_params);
 810         subs->period_bytes = params_period_bytes(hw_params);
 811         subs->period_frames = params_period_size(hw_params);
 812         subs->buffer_periods = params_periods(hw_params);
 813         subs->channels = params_channels(hw_params);
 814         subs->cur_rate = params_rate(hw_params);
 815
 816         fmt = find_format(subs);
 817         if (!fmt) {
 818                 dev_dbg(&subs->dev->dev,
 819                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 820                            subs->pcm_format, subs->cur_rate, subs->channels);
 821                 ret = -EINVAL;
 822                 goto stop_pipeline;
 823         }
 824
 825         ret = snd_usb_lock_shutdown(subs->stream->chip);
 826         if (ret < 0)
 827                 goto stop_pipeline;
 828
 829         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 830         if (ret < 0)
 831                 goto unlock;
 832
 833         ret = set_format(subs, fmt);
 834         if (ret < 0)
 835                 goto unlock;
 836
 837         subs->interface = fmt->iface;
 838         subs->altset_idx = fmt->altset_idx;
 839         subs->need_setup_ep = true;
 840
 841  unlock:
 842         snd_usb_unlock_shutdown(subs->stream->chip);
 843         if (ret < 0)
 844                 goto stop_pipeline;
 845         return ret;
 846
 847  stop_pipeline:
 848         snd_media_stop_pipeline(subs);
 849         return ret;
 850 }
 851
 852 /*
 853  * hw_free callback
 854  *
 855  * reset the audio format and release the buffer
 856  */
 857 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 858 {
 859         struct snd_usb_substream *subs = substream->runtime->private_data;
 860
 861         snd_media_stop_pipeline(subs);
 862         subs->cur_audiofmt = NULL;
 863         subs->cur_rate = 0;
 864         subs->period_bytes = 0;
 865         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 866                 stop_endpoints(subs);
 867                 sync_pending_stops(subs);
 868                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 869                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 870                 snd_usb_unlock_shutdown(subs->stream->chip);
 871         }
 872
 873         return 0;
 874 }
 875
 876 /*
 877  * prepare callback
 878  *
 879  * only a few subtle things...
 880  */
 881 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 882 {
 883         struct snd_pcm_runtime *runtime = substream->runtime;
 884         struct snd_usb_substream *subs = runtime->private_data;
 885         struct usb_host_interface *alts;
 886         struct usb_interface *iface;
 887         int ret;
 888
 889         if (! subs->cur_audiofmt) {
 890                 dev_err(&subs->dev->dev, "no format is specified!\n");
 891                 return -ENXIO;
 892         }
 893
 894         ret = snd_usb_lock_shutdown(subs->stream->chip);
 895         if (ret < 0)
 896                 return ret;
 897         if (snd_BUG_ON(!subs->data_endpoint)) {
 898                 ret = -EIO;
 899                 goto unlock;
 900         }
 901
 902         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 903         if (ret < 0)
 904                 goto unlock;
 905
 906         ret = set_format(subs, subs->cur_audiofmt);
 907         if (ret < 0)
 908                 goto unlock;
 909
 910         if (subs->need_setup_ep) {
 911
 912                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 913                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 914                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 915                                                subs->cur_audiofmt->iface,
 916                                                alts,
 917                                                subs->cur_audiofmt,
 918                                                subs->cur_rate);
 919                 if (ret < 0)
 920                         goto unlock;
 921
 922                 ret = configure_endpoint(subs);
 923                 if (ret < 0)
 924                         goto unlock;
 925                 subs->need_setup_ep = false;
 926         }
 927
 928         /* some unit conversions in runtime */
 929         subs->data_endpoint->maxframesize =
 930                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 931         subs->data_endpoint->curframesize =
 932                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 933
 934         /* reset the pointer */
 935         subs->hwptr_done = 0;
 936         subs->transfer_done = 0;
 937         subs->last_delay = 0;
 938         subs->last_frame_number = 0;
 939         runtime->delay = 0;
 940
 941         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 942          * updates for all URBs would happen at the same time when starting */
 943         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 944                 ret = start_endpoints(subs);
 945
 946  unlock:
 947         snd_usb_unlock_shutdown(subs->stream->chip);
 948         return ret;
 949 }
 950
 951 static const struct snd_pcm_hardware snd_usb_hardware =
 952 {
 953         .info =                 SNDRV_PCM_INFO_MMAP |
 954                                 SNDRV_PCM_INFO_MMAP_VALID |
 955                                 SNDRV_PCM_INFO_BATCH |
 956                                 SNDRV_PCM_INFO_INTERLEAVED |
 957                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 958                                 SNDRV_PCM_INFO_PAUSE,
 959         .buffer_bytes_max =     1024 * 1024,
 960         .period_bytes_min =     64,
 961         .period_bytes_max =     512 * 1024,
 962         .periods_min =          2,
 963         .periods_max =          1024,
 964 };
 965
 966 static int hw_check_valid_format(struct snd_usb_substream *subs,
 967                                  struct snd_pcm_hw_params *params,
 968                                  struct audioformat *fp)
 969 {
 970         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 971         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 972         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 973         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 974         struct snd_mask check_fmts;
 975         unsigned int ptime;
 976
 977         /* check the format */
 978         snd_mask_none(&check_fmts);
 979         check_fmts.bits[0] = (u32)fp->formats;
 980         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 981         snd_mask_intersect(&check_fmts, fmts);
 982         if (snd_mask_empty(&check_fmts)) {
 983                 hwc_debug("   > check: no supported format %d\n", fp->format);
 984                 return 0;
 985         }
 986         /* check the channels */
 987         if (fp->channels < ct->min || fp->channels > ct->max) {
 988                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 989                 return 0;
 990         }
 991         /* check the rate is within the range */
 992         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 993                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 994                 return 0;
 995         }
 996         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 997                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 998                 return 0;
 999         }
1000         /* check whether the period time is >= the data packet interval */
1001         if (subs->speed != USB_SPEED_FULL) {
1002                 ptime = 125 * (1 << fp->datainterval);
1003                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1004                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1005                         return 0;
1006                 }
1007         }
1008         return 1;
1009 }
1010
1011 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1012                         struct snd_pcm_hw_rule *rule)
1013 {
1014         struct snd_usb_substream *subs = rule->private;
1015         struct audioformat *fp;
1016         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1017         unsigned int rmin, rmax;
1018         int changed;
1019
1020         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1021         changed = 0;
1022         rmin = rmax = 0;
1023         list_for_each_entry(fp, &subs->fmt_list, list) {
1024                 if (!hw_check_valid_format(subs, params, fp))
1025                         continue;
1026                 if (changed++) {
1027                         if (rmin > fp->rate_min)
1028                                 rmin = fp->rate_min;
1029                         if (rmax < fp->rate_max)
1030                                 rmax = fp->rate_max;
1031                 } else {
1032                         rmin = fp->rate_min;
1033                         rmax = fp->rate_max;
1034                 }
1035         }
1036
1037         if (!changed) {
1038                 hwc_debug("  --> get empty\n");
1039                 it->empty = 1;
1040                 return -EINVAL;
1041         }
1042
1043         changed = 0;
1044         if (it->min < rmin) {
1045                 it->min = rmin;
1046                 it->openmin = 0;
1047                 changed = 1;
1048         }
1049         if (it->max > rmax) {
1050                 it->max = rmax;
1051                 it->openmax = 0;
1052                 changed = 1;
1053         }
1054         if (snd_interval_checkempty(it)) {
1055                 it->empty = 1;
1056                 return -EINVAL;
1057         }
1058         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1059         return changed;
1060 }
1061
1062
1063 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1064                             struct snd_pcm_hw_rule *rule)
1065 {
1066         struct snd_usb_substream *subs = rule->private;
1067         struct audioformat *fp;
1068         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1069         unsigned int rmin, rmax;
1070         int changed;
1071
1072         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1073         changed = 0;
1074         rmin = rmax = 0;
1075         list_for_each_entry(fp, &subs->fmt_list, list) {
1076                 if (!hw_check_valid_format(subs, params, fp))
1077                         continue;
1078                 if (changed++) {
1079                         if (rmin > fp->channels)
1080                                 rmin = fp->channels;
1081                         if (rmax < fp->channels)
1082                                 rmax = fp->channels;
1083                 } else {
1084                         rmin = fp->channels;
1085                         rmax = fp->channels;
1086                 }
1087         }
1088
1089         if (!changed) {
1090                 hwc_debug("  --> get empty\n");
1091                 it->empty = 1;
1092                 return -EINVAL;
1093         }
1094
1095         changed = 0;
1096         if (it->min < rmin) {
1097                 it->min = rmin;
1098                 it->openmin = 0;
1099                 changed = 1;
1100         }
1101         if (it->max > rmax) {
1102                 it->max = rmax;
1103                 it->openmax = 0;
1104                 changed = 1;
1105         }
1106         if (snd_interval_checkempty(it)) {
1107                 it->empty = 1;
1108                 return -EINVAL;
1109         }
1110         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1111         return changed;
1112 }
1113
1114 static int hw_rule_format(struct snd_pcm_hw_params *params,
1115                           struct snd_pcm_hw_rule *rule)
1116 {
1117         struct snd_usb_substream *subs = rule->private;
1118         struct audioformat *fp;
1119         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1120         u64 fbits;
1121         u32 oldbits[2];
1122         int changed;
1123
1124         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1125         fbits = 0;
1126         list_for_each_entry(fp, &subs->fmt_list, list) {
1127                 if (!hw_check_valid_format(subs, params, fp))
1128                         continue;
1129                 fbits |= fp->formats;
1130         }
1131
1132         oldbits[0] = fmt->bits[0];
1133         oldbits[1] = fmt->bits[1];
1134         fmt->bits[0] &= (u32)fbits;
1135         fmt->bits[1] &= (u32)(fbits >> 32);
1136         if (!fmt->bits[0] && !fmt->bits[1]) {
1137                 hwc_debug("  --> get empty\n");
1138                 return -EINVAL;
1139         }
1140         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1141         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1142         return changed;
1143 }
1144
1145 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1146                                struct snd_pcm_hw_rule *rule)
1147 {
1148         struct snd_usb_substream *subs = rule->private;
1149         struct audioformat *fp;
1150         struct snd_interval *it;
1151         unsigned char min_datainterval;
1152         unsigned int pmin;
1153         int changed;
1154
1155         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1156         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1157         min_datainterval = 0xff;
1158         list_for_each_entry(fp, &subs->fmt_list, list) {
1159                 if (!hw_check_valid_format(subs, params, fp))
1160                         continue;
1161                 min_datainterval = min(min_datainterval, fp->datainterval);
1162         }
1163         if (min_datainterval == 0xff) {
1164                 hwc_debug("  --> get empty\n");
1165                 it->empty = 1;
1166                 return -EINVAL;
1167         }
1168         pmin = 125 * (1 << min_datainterval);
1169         changed = 0;
1170         if (it->min < pmin) {
1171                 it->min = pmin;
1172                 it->openmin = 0;
1173                 changed = 1;
1174         }
1175         if (snd_interval_checkempty(it)) {
1176                 it->empty = 1;
1177                 return -EINVAL;
1178         }
1179         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1180         return changed;
1181 }
1182
1183 /*
1184  *  If the device supports unusual bit rates, does the request meet these?
1185  */
1186 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1187                                   struct snd_usb_substream *subs)
1188 {
1189         struct audioformat *fp;
1190         int *rate_list;
1191         int count = 0, needs_knot = 0;
1192         int err;
1193
1194         kfree(subs->rate_list.list);
1195         subs->rate_list.list = NULL;
1196
1197         list_for_each_entry(fp, &subs->fmt_list, list) {
1198                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1199                         return 0;
1200                 count += fp->nr_rates;
1201                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1202                         needs_knot = 1;
1203         }
1204         if (!needs_knot)
1205                 return 0;
1206
1207         subs->rate_list.list = rate_list =
1208                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1209         if (!subs->rate_list.list)
1210                 return -ENOMEM;
1211         subs->rate_list.count = count;
1212         subs->rate_list.mask = 0;
1213         count = 0;
1214         list_for_each_entry(fp, &subs->fmt_list, list) {
1215                 int i;
1216                 for (i = 0; i < fp->nr_rates; i++)
1217                         rate_list[count++] = fp->rate_table[i];
1218         }
1219         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1220                                          &subs->rate_list);
1221         if (err < 0)
1222                 return err;
1223
1224         return 0;
1225 }
1226
1227
1228 /*
1229  * set up the runtime hardware information.
1230  */
1231
1232 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1233 {
1234         struct audioformat *fp;
1235         unsigned int pt, ptmin;
1236         int param_period_time_if_needed;
1237         int err;
1238
1239         runtime->hw.formats = subs->formats;
1240
1241         runtime->hw.rate_min = 0x7fffffff;
1242         runtime->hw.rate_max = 0;
1243         runtime->hw.channels_min = 256;
1244         runtime->hw.channels_max = 0;
1245         runtime->hw.rates = 0;
1246         ptmin = UINT_MAX;
1247         /* check min/max rates and channels */
1248         list_for_each_entry(fp, &subs->fmt_list, list) {
1249                 runtime->hw.rates |= fp->rates;
1250                 if (runtime->hw.rate_min > fp->rate_min)
1251                         runtime->hw.rate_min = fp->rate_min;
1252                 if (runtime->hw.rate_max < fp->rate_max)
1253                         runtime->hw.rate_max = fp->rate_max;
1254                 if (runtime->hw.channels_min > fp->channels)
1255                         runtime->hw.channels_min = fp->channels;
1256                 if (runtime->hw.channels_max < fp->channels)
1257                         runtime->hw.channels_max = fp->channels;
1258                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1259                         /* FIXME: there might be more than one audio formats... */
1260                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1261                                 fp->frame_size;
1262                 }
1263                 pt = 125 * (1 << fp->datainterval);
1264                 ptmin = min(ptmin, pt);
1265         }
1266
1267         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1268         if (subs->speed == USB_SPEED_FULL)
1269                 /* full speed devices have fixed data packet interval */
1270                 ptmin = 1000;
1271         if (ptmin == 1000)
1272                 /* if period time doesn't go below 1 ms, no rules needed */
1273                 param_period_time_if_needed = -1;
1274
1275         err = snd_pcm_hw_constraint_minmax(runtime,
1276                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1277                                            ptmin, UINT_MAX);
1278         if (err < 0)
1279                 return err;
1280
1281         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1282                                   hw_rule_rate, subs,
1283                                   SNDRV_PCM_HW_PARAM_FORMAT,
1284                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1285                                   param_period_time_if_needed,
1286                                   -1);
1287         if (err < 0)
1288                 return err;
1289         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1290                                   hw_rule_channels, subs,
1291                                   SNDRV_PCM_HW_PARAM_FORMAT,
1292                                   SNDRV_PCM_HW_PARAM_RATE,
1293                                   param_period_time_if_needed,
1294                                   -1);
1295         if (err < 0)
1296                 return err;
1297         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1298                                   hw_rule_format, subs,
1299                                   SNDRV_PCM_HW_PARAM_RATE,
1300                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1301                                   param_period_time_if_needed,
1302                                   -1);
1303         if (err < 0)
1304                 return err;
1305         if (param_period_time_if_needed >= 0) {
1306                 err = snd_pcm_hw_rule_add(runtime, 0,
1307                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1308                                           hw_rule_period_time, subs,
1309                                           SNDRV_PCM_HW_PARAM_FORMAT,
1310                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1311                                           SNDRV_PCM_HW_PARAM_RATE,
1312                                           -1);
1313                 if (err < 0)
1314                         return err;
1315         }
1316         err = snd_usb_pcm_check_knot(runtime, subs);
1317         if (err < 0)
1318                 return err;
1319
1320         return snd_usb_autoresume(subs->stream->chip);
1321 }
1322
1323 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1324 {
1325         int direction = substream->stream;
1326         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1327         struct snd_pcm_runtime *runtime = substream->runtime;
1328         struct snd_usb_substream *subs = &as->substream[direction];
1329         int ret;
1330
1331         subs->interface = -1;
1332         subs->altset_idx = 0;
1333         runtime->hw = snd_usb_hardware;
1334         runtime->private_data = subs;
1335         subs->pcm_substream = substream;
1336         /* runtime PM is also done there */
1337
1338         /* initialize DSD/DOP context */
1339         subs->dsd_dop.byte_idx = 0;
1340         subs->dsd_dop.channel = 0;
1341         subs->dsd_dop.marker = 1;
1342
1343         ret = setup_hw_info(runtime, subs);
1344         if (ret == 0) {
1345                 ret = snd_media_stream_init(subs, as->pcm, direction);
1346                 if (ret)
1347                         snd_usb_autosuspend(subs->stream->chip);
1348         }
1349         return ret;
1350 }
1351
1352 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1353 {
1354         int direction = substream->stream;
1355         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1356         struct snd_usb_substream *subs = &as->substream[direction];
1357         int ret;
1358
1359         snd_media_stop_pipeline(subs);
1360
1361         if (!as->chip->keep_iface &&
1362             subs->interface >= 0 &&
1363             !snd_usb_lock_shutdown(subs->stream->chip)) {
1364                 usb_set_interface(subs->dev, subs->interface, 0);
1365                 subs->interface = -1;
1366                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1367                 snd_usb_unlock_shutdown(subs->stream->chip);
1368                 if (ret < 0)
1369                         return ret;
1370         }
1371
1372         subs->pcm_substream = NULL;
1373         snd_usb_autosuspend(subs->stream->chip);
1374
1375         return 0;
1376 }
1377
1378 /* Since a URB can handle only a single linear buffer, we must use double
1379  * buffering when the data to be transferred overflows the buffer boundary.
1380  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1381  * for all URBs.
1382  */
1383 static void retire_capture_urb(struct snd_usb_substream *subs,
1384                                struct urb *urb)
1385 {
1386         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1387         unsigned int stride, frames, bytes, oldptr;
1388         int i, period_elapsed = 0;
1389         unsigned long flags;
1390         unsigned char *cp;
1391         int current_frame_number;
1392
1393         /* read frame number here, update pointer in critical section */
1394         current_frame_number = usb_get_current_frame_number(subs->dev);
1395
1396         stride = runtime->frame_bits >> 3;
1397
1398         for (i = 0; i < urb->number_of_packets; i++) {
1399                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1400                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1401                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1402                                 i, urb->iso_frame_desc[i].status);
1403                         // continue;
1404                 }
1405                 bytes = urb->iso_frame_desc[i].actual_length;
1406                 frames = bytes / stride;
1407                 if (!subs->txfr_quirk)
1408                         bytes = frames * stride;
1409                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1410                         int oldbytes = bytes;
1411                         bytes = frames * stride;
1412                         dev_warn_ratelimited(&subs->dev->dev,
1413                                  "Corrected urb data len. %d->%d\n",
1414                                                         oldbytes, bytes);
1415                 }
1416                 /* update the current pointer */
1417                 spin_lock_irqsave(&subs->lock, flags);
1418                 oldptr = subs->hwptr_done;
1419                 subs->hwptr_done += bytes;
1420                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1421                         subs->hwptr_done -= runtime->buffer_size * stride;
1422                 frames = (bytes + (oldptr % stride)) / stride;
1423                 subs->transfer_done += frames;
1424                 if (subs->transfer_done >= runtime->period_size) {
1425                         subs->transfer_done -= runtime->period_size;
1426                         period_elapsed = 1;
1427                 }
1428                 /* capture delay is by construction limited to one URB,
1429                  * reset delays here
1430                  */
1431                 runtime->delay = subs->last_delay = 0;
1432
1433                 /* realign last_frame_number */
1434                 subs->last_frame_number = current_frame_number;
1435                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1436
1437                 spin_unlock_irqrestore(&subs->lock, flags);
1438                 /* copy a data chunk */
1439                 if (oldptr + bytes > runtime->buffer_size * stride) {
1440                         unsigned int bytes1 =
1441                                         runtime->buffer_size * stride - oldptr;
1442                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1443                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1444                 } else {
1445                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1446                 }
1447         }
1448
1449         if (period_elapsed)
1450                 snd_pcm_period_elapsed(subs->pcm_substream);
1451 }
1452
1453 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1454                                              struct urb *urb, unsigned int bytes)
1455 {
1456         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1457         unsigned int stride = runtime->frame_bits >> 3;
1458         unsigned int dst_idx = 0;
1459         unsigned int src_idx = subs->hwptr_done;
1460         unsigned int wrap = runtime->buffer_size * stride;
1461         u8 *dst = urb->transfer_buffer;
1462         u8 *src = runtime->dma_area;
1463         u8 marker[] = { 0x05, 0xfa };
1464
1465         /*
1466          * The DSP DOP format defines a way to transport DSD samples over
1467          * normal PCM data endpoints. It requires stuffing of marker bytes
1468          * (0x05 and 0xfa, alternating per sample frame), and then expects
1469          * 2 additional bytes of actual payload. The whole frame is stored
1470          * LSB.
1471          *
1472          * Hence, for a stereo transport, the buffer layout looks like this,
1473          * where L refers to left channel samples and R to right.
1474          *
1475          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1476          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1477          *   .....
1478          *
1479          */
1480
1481         while (bytes--) {
1482                 if (++subs->dsd_dop.byte_idx == 3) {
1483                         /* frame boundary? */
1484                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1485                         src_idx += 2;
1486                         subs->dsd_dop.byte_idx = 0;
1487
1488                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1489                                 /* alternate the marker */
1490                                 subs->dsd_dop.marker++;
1491                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1492                                 subs->dsd_dop.channel = 0;
1493                         }
1494                 } else {
1495                         /* stuff the DSD payload */
1496                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1497
1498                         if (subs->cur_audiofmt->dsd_bitrev)
1499                                 dst[dst_idx++] = bitrev8(src[idx]);
1500                         else
1501                                 dst[dst_idx++] = src[idx];
1502
1503                         subs->hwptr_done++;
1504                 }
1505         }
1506         if (subs->hwptr_done >= runtime->buffer_size * stride)
1507                 subs->hwptr_done -= runtime->buffer_size * stride;
1508 }
1509
1510 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1511                         int offset, int stride, unsigned int bytes)
1512 {
1513         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1514
1515         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1516                 /* err, the transferred area goes over buffer boundary. */
1517                 unsigned int bytes1 =
1518                         runtime->buffer_size * stride - subs->hwptr_done;
1519                 memcpy(urb->transfer_buffer + offset,
1520                        runtime->dma_area + subs->hwptr_done, bytes1);
1521                 memcpy(urb->transfer_buffer + offset + bytes1,
1522                        runtime->dma_area, bytes - bytes1);
1523         } else {
1524                 memcpy(urb->transfer_buffer + offset,
1525                        runtime->dma_area + subs->hwptr_done, bytes);
1526         }
1527         subs->hwptr_done += bytes;
1528         if (subs->hwptr_done >= runtime->buffer_size * stride)
1529                 subs->hwptr_done -= runtime->buffer_size * stride;
1530 }
1531
1532 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1533                                       struct urb *urb, int stride,
1534                                       unsigned int bytes)
1535 {
1536         __le32 packet_length;
1537         int i;
1538
1539         /* Put __le32 length descriptor at start of each packet. */
1540         for (i = 0; i < urb->number_of_packets; i++) {
1541                 unsigned int length = urb->iso_frame_desc[i].length;
1542                 unsigned int offset = urb->iso_frame_desc[i].offset;
1543
1544                 packet_length = cpu_to_le32(length);
1545                 offset += i * sizeof(packet_length);
1546                 urb->iso_frame_desc[i].offset = offset;
1547                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1548                 memcpy(urb->transfer_buffer + offset,
1549                        &packet_length, sizeof(packet_length));
1550                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1551                             stride, length);
1552         }
1553         /* Adjust transfer size accordingly. */
1554         bytes += urb->number_of_packets * sizeof(packet_length);
1555         return bytes;
1556 }
1557
1558 static void prepare_playback_urb(struct snd_usb_substream *subs,
1559                                  struct urb *urb)
1560 {
1561         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1562         struct snd_usb_endpoint *ep = subs->data_endpoint;
1563         struct snd_urb_ctx *ctx = urb->context;
1564         unsigned int counts, frames, bytes;
1565         int i, stride, period_elapsed = 0;
1566         unsigned long flags;
1567
1568         stride = runtime->frame_bits >> 3;
1569
1570         frames = 0;
1571         urb->number_of_packets = 0;
1572         spin_lock_irqsave(&subs->lock, flags);
1573         subs->frame_limit += ep->max_urb_frames;
1574         for (i = 0; i < ctx->packets; i++) {
1575                 if (ctx->packet_size[i])
1576                         counts = ctx->packet_size[i];
1577                 else
1578                         counts = snd_usb_endpoint_next_packet_size(ep);
1579
1580                 /* set up descriptor */
1581                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1582                 urb->iso_frame_desc[i].length = counts * ep->stride;
1583                 frames += counts;
1584                 urb->number_of_packets++;
1585                 subs->transfer_done += counts;
1586                 if (subs->transfer_done >= runtime->period_size) {
1587                         subs->transfer_done -= runtime->period_size;
1588                         subs->frame_limit = 0;
1589                         period_elapsed = 1;
1590                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1591                                 if (subs->transfer_done > 0) {
1592                                         /* FIXME: fill-max mode is not
1593                                          * supported yet */
1594                                         frames -= subs->transfer_done;
1595                                         counts -= subs->transfer_done;
1596                                         urb->iso_frame_desc[i].length =
1597                                                 counts * ep->stride;
1598                                         subs->transfer_done = 0;
1599                                 }
1600                                 i++;
1601                                 if (i < ctx->packets) {
1602                                         /* add a transfer delimiter */
1603                                         urb->iso_frame_desc[i].offset =
1604                                                 frames * ep->stride;
1605                                         urb->iso_frame_desc[i].length = 0;
1606                                         urb->number_of_packets++;
1607                                 }
1608                                 break;
1609                         }
1610                 }
1611                 /* finish at the period boundary or after enough frames */
1612                 if ((period_elapsed ||
1613                                 subs->transfer_done >= subs->frame_limit) &&
1614                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1615                         break;
1616         }
1617         bytes = frames * ep->stride;
1618
1619         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1620                      subs->cur_audiofmt->dsd_dop)) {
1621                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1622         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1623                            subs->cur_audiofmt->dsd_bitrev)) {
1624                 /* bit-reverse the bytes */
1625                 u8 *buf = urb->transfer_buffer;
1626                 for (i = 0; i < bytes; i++) {
1627                         int idx = (subs->hwptr_done + i)
1628                                 % (runtime->buffer_size * stride);
1629                         buf[i] = bitrev8(runtime->dma_area[idx]);
1630                 }
1631
1632                 subs->hwptr_done += bytes;
1633                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1634                         subs->hwptr_done -= runtime->buffer_size * stride;
1635         } else {
1636                 /* usual PCM */
1637                 if (!subs->tx_length_quirk)
1638                         copy_to_urb(subs, urb, 0, stride, bytes);
1639                 else
1640                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1641                         /* bytes is now amount of outgoing data */
1642         }
1643
1644         /* update delay with exact number of samples queued */
1645         runtime->delay = subs->last_delay;
1646         runtime->delay += frames;
1647         subs->last_delay = runtime->delay;
1648
1649         /* realign last_frame_number */
1650         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1651         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1652
1653         if (subs->trigger_tstamp_pending_update) {
1654                 /* this is the first actual URB submitted,
1655                  * update trigger timestamp to reflect actual start time
1656                  */
1657                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1658                 subs->trigger_tstamp_pending_update = false;
1659         }
1660
1661         spin_unlock_irqrestore(&subs->lock, flags);
1662         urb->transfer_buffer_length = bytes;
1663         if (period_elapsed)
1664                 snd_pcm_period_elapsed(subs->pcm_substream);
1665 }
1666
1667 /*
1668  * process after playback data complete
1669  * - decrease the delay count again
1670  */
1671 static void retire_playback_urb(struct snd_usb_substream *subs,
1672                                struct urb *urb)
1673 {
1674         unsigned long flags;
1675         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1676         struct snd_usb_endpoint *ep = subs->data_endpoint;
1677         int processed = urb->transfer_buffer_length / ep->stride;
1678         int est_delay;
1679
1680         /* ignore the delay accounting when procssed=0 is given, i.e.
1681          * silent payloads are procssed before handling the actual data
1682          */
1683         if (!processed)
1684                 return;
1685
1686         spin_lock_irqsave(&subs->lock, flags);
1687         if (!subs->last_delay)
1688                 goto out; /* short path */
1689
1690         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1691         /* update delay with exact number of samples played */
1692         if (processed > subs->last_delay)
1693                 subs->last_delay = 0;
1694         else
1695                 subs->last_delay -= processed;
1696         runtime->delay = subs->last_delay;
1697
1698         /*
1699          * Report when delay estimate is off by more than 2ms.
1700          * The error should be lower than 2ms since the estimate relies
1701          * on two reads of a counter updated every ms.
1702          */
1703         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1704                 dev_dbg_ratelimited(&subs->dev->dev,
1705                         "delay: estimated %d, actual %d\n",
1706                         est_delay, subs->last_delay);
1707
1708         if (!subs->running) {
1709                 /* update last_frame_number for delay counting here since
1710                  * prepare_playback_urb won't be called during pause
1711                  */
1712                 subs->last_frame_number =
1713                         usb_get_current_frame_number(subs->dev) & 0xff;
1714         }
1715
1716  out:
1717         spin_unlock_irqrestore(&subs->lock, flags);
1718 }
1719
1720 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1721                                               int cmd)
1722 {
1723         struct snd_usb_substream *subs = substream->runtime->private_data;
1724
1725         switch (cmd) {
1726         case SNDRV_PCM_TRIGGER_START:
1727                 subs->trigger_tstamp_pending_update = true;
1728                 /* fall through */
1729         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1730                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1731                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1732                 subs->running = 1;
1733                 return 0;
1734         case SNDRV_PCM_TRIGGER_STOP:
1735                 stop_endpoints(subs);
1736                 subs->running = 0;
1737                 return 0;
1738         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1739                 subs->data_endpoint->prepare_data_urb = NULL;
1740                 /* keep retire_data_urb for delay calculation */
1741                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1742                 subs->running = 0;
1743                 return 0;
1744         case SNDRV_PCM_TRIGGER_SUSPEND:
1745                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1746                         stop_endpoints(subs);
1747                         subs->need_setup_fmt = true;
1748                         return 0;
1749                 }
1750                 break;
1751         }
1752
1753         return -EINVAL;
1754 }
1755
1756 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1757                                              int cmd)
1758 {
1759         int err;
1760         struct snd_usb_substream *subs = substream->runtime->private_data;
1761
1762         switch (cmd) {
1763         case SNDRV_PCM_TRIGGER_START:
1764                 err = start_endpoints(subs);
1765                 if (err < 0)
1766                         return err;
1767
1768                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1769                 subs->running = 1;
1770                 return 0;
1771         case SNDRV_PCM_TRIGGER_STOP:
1772                 stop_endpoints(subs);
1773                 subs->running = 0;
1774                 return 0;
1775         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1776                 subs->data_endpoint->retire_data_urb = NULL;
1777                 subs->running = 0;
1778                 return 0;
1779         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1780                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1781                 subs->running = 1;
1782                 return 0;
1783         case SNDRV_PCM_TRIGGER_SUSPEND:
1784                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1785                         stop_endpoints(subs);
1786                         subs->need_setup_fmt = true;
1787                         return 0;
1788                 }
1789                 break;
1790         }
1791
1792         return -EINVAL;
1793 }
1794
1795 static const struct snd_pcm_ops snd_usb_playback_ops = {
1796         .open =         snd_usb_pcm_open,
1797         .close =        snd_usb_pcm_close,
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         .sync_stop =    snd_usb_pcm_sync_stop,
1803         .pointer =      snd_usb_pcm_pointer,
1804 };
1805
1806 static const struct snd_pcm_ops snd_usb_capture_ops = {
1807         .open =         snd_usb_pcm_open,
1808         .close =        snd_usb_pcm_close,
1809         .hw_params =    snd_usb_hw_params,
1810         .hw_free =      snd_usb_hw_free,
1811         .prepare =      snd_usb_pcm_prepare,
1812         .trigger =      snd_usb_substream_capture_trigger,
1813         .sync_stop =    snd_usb_pcm_sync_stop,
1814         .pointer =      snd_usb_pcm_pointer,
1815 };
1816
1817 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1818 {
1819         const struct snd_pcm_ops *ops;
1820
1821         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1822                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1823         snd_pcm_set_ops(pcm, stream, ops);
1824 }
1825
1826 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1827 {
1828         struct snd_pcm *pcm = subs->stream->pcm;
1829         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1830         struct device *dev = subs->dev->bus->controller;
1831
1832         if (snd_usb_use_vmalloc)
1833                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1834                                            NULL, 0, 0);
1835         else
1836                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1837                                            dev, 64*1024, 512*1024);
1838 }