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/IIc */
 361                 /* MicroBook IIc */
 362                 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
 363                         return 0;
 364
 365                 /* MicroBook II */
 366                 ep = 0x84;
 367                 ifnum = 0;
 368                 goto add_sync_ep_from_ifnum;
 369         case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
 370                 ep = 0x81;
 371                 ifnum = 2;
 372                 goto add_sync_ep_from_ifnum;
 373         case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 374                 ep = 0x82;
 375                 ifnum = 0;
 376                 goto add_sync_ep_from_ifnum;
 377         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 378                 /* BOSS Katana amplifiers do not need quirks */
 379                 return 0;
 380         }
 381
 382         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 383             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 384             altsd->bInterfaceProtocol == 2 &&
 385             altsd->bNumEndpoints == 1 &&
 386             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 387             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 388                                       altsd->bAlternateSetting,
 389                                       &alts, &ep) >= 0) {
 390                 goto add_sync_ep;
 391         }
 392
 393         /* No quirk */
 394         return 0;
 395
 396 add_sync_ep_from_ifnum:
 397         iface = usb_ifnum_to_if(dev, ifnum);
 398
 399         if (!iface || iface->num_altsetting < 2)
 400                 return -EINVAL;
 401
 402         alts = &iface->altsetting[1];
 403
 404 add_sync_ep:
 405         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 406                                                    alts, ep, !subs->direction,
 407                                                    SND_USB_ENDPOINT_TYPE_DATA);
 408         if (!subs->sync_endpoint)
 409                 return -EINVAL;
 410
 411         subs->sync_endpoint->is_implicit_feedback = 1;
 412
 413         subs->data_endpoint->sync_master = subs->sync_endpoint;
 414
 415         return 1;
 416 }
 417
 418 static int set_sync_endpoint(struct snd_usb_substream *subs,
 419                              struct audioformat *fmt,
 420                              struct usb_device *dev,
 421                              struct usb_host_interface *alts,
 422                              struct usb_interface_descriptor *altsd)
 423 {
 424         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 425         unsigned int ep, attr;
 426         bool implicit_fb;
 427         int err;
 428
 429         /* we need a sync pipe in async OUT or adaptive IN mode */
 430         /* check the number of EP, since some devices have broken
 431          * descriptors which fool us.  if it has only one EP,
 432          * assume it as adaptive-out or sync-in.
 433          */
 434         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 435
 436         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 437                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 438
 439                 /*
 440                  * In these modes the notion of sync_endpoint is irrelevant.
 441                  * Reset pointers to avoid using stale data from previously
 442                  * used settings, e.g. when configuration and endpoints were
 443                  * changed
 444                  */
 445
 446                 subs->sync_endpoint = NULL;
 447                 subs->data_endpoint->sync_master = NULL;
 448         }
 449
 450         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 451         if (err < 0)
 452                 return err;
 453
 454         /* endpoint set by quirk */
 455         if (err > 0)
 456                 return 0;
 457
 458         if (altsd->bNumEndpoints < 2)
 459                 return 0;
 460
 461         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 462                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 463             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 464                 return 0;
 465
 466         /*
 467          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 468          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 469          * error fall back to SYNC mode and don't create sync endpoint
 470          */
 471
 472         /* check sync-pipe endpoint */
 473         /* ... and check descriptor size before accessing bSynchAddress
 474            because there is a version of the SB Audigy 2 NX firmware lacking
 475            the audio fields in the endpoint descriptors */
 476         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 477             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 478              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 479                 dev_err(&dev->dev,
 480                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 481                            fmt->iface, fmt->altsetting,
 482                            get_endpoint(alts, 1)->bmAttributes,
 483                            get_endpoint(alts, 1)->bLength,
 484                            get_endpoint(alts, 1)->bSynchAddress);
 485                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 486                         return 0;
 487                 return -EINVAL;
 488         }
 489         ep = get_endpoint(alts, 1)->bEndpointAddress;
 490         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 491             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 492             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 493              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 494                 dev_err(&dev->dev,
 495                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 496                            fmt->iface, fmt->altsetting,
 497                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 498                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 499                         return 0;
 500                 return -EINVAL;
 501         }
 502
 503         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 504                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 505
 506         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 507                                                    alts, ep, !subs->direction,
 508                                                    implicit_fb ?
 509                                                         SND_USB_ENDPOINT_TYPE_DATA :
 510                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 511
 512         if (!subs->sync_endpoint) {
 513                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 514                         return 0;
 515                 return -EINVAL;
 516         }
 517
 518         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 519
 520         subs->data_endpoint->sync_master = subs->sync_endpoint;
 521
 522         return 0;
 523 }
 524
 525 /*
 526  * find a matching format and set up the interface
 527  */
 528 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 529 {
 530         struct usb_device *dev = subs->dev;
 531         struct usb_host_interface *alts;
 532         struct usb_interface_descriptor *altsd;
 533         struct usb_interface *iface;
 534         int err;
 535
 536         iface = usb_ifnum_to_if(dev, fmt->iface);
 537         if (WARN_ON(!iface))
 538                 return -EINVAL;
 539         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 540         if (WARN_ON(!alts))
 541                 return -EINVAL;
 542         altsd = get_iface_desc(alts);
 543
 544         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 545                 return 0;
 546
 547         /* close the old interface */
 548         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 549                 if (!subs->stream->chip->keep_iface) {
 550                         err = usb_set_interface(subs->dev, subs->interface, 0);
 551                         if (err < 0) {
 552                                 dev_err(&dev->dev,
 553                                         "%d:%d: return to setting 0 failed (%d)\n",
 554                                         fmt->iface, fmt->altsetting, err);
 555                                 return -EIO;
 556                         }
 557                 }
 558                 subs->interface = -1;
 559                 subs->altset_idx = 0;
 560         }
 561
 562         if (subs->need_setup_fmt)
 563                 subs->need_setup_fmt = false;
 564
 565         /* set interface */
 566         if (iface->cur_altsetting != alts) {
 567                 err = snd_usb_select_mode_quirk(subs, fmt);
 568                 if (err < 0)
 569                         return -EIO;
 570
 571                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 572                 if (err < 0) {
 573                         dev_err(&dev->dev,
 574                                 "%d:%d: usb_set_interface failed (%d)\n",
 575                                 fmt->iface, fmt->altsetting, err);
 576                         return -EIO;
 577                 }
 578                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 579                         fmt->iface, fmt->altsetting);
 580                 snd_usb_set_interface_quirk(dev);
 581         }
 582
 583         subs->interface = fmt->iface;
 584         subs->altset_idx = fmt->altset_idx;
 585         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 586                                                    alts, fmt->endpoint, subs->direction,
 587                                                    SND_USB_ENDPOINT_TYPE_DATA);
 588
 589         if (!subs->data_endpoint)
 590                 return -EINVAL;
 591
 592         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 593         if (err < 0)
 594                 return err;
 595
 596         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 597         if (err < 0)
 598                 return err;
 599
 600         subs->cur_audiofmt = fmt;
 601
 602         snd_usb_set_format_quirk(subs, fmt);
 603
 604         return 0;
 605 }
 606
 607 /*
 608  * Return the score of matching two audioformats.
 609  * Veto the audioformat if:
 610  * - It has no channels for some reason.
 611  * - Requested PCM format is not supported.
 612  * - Requested sample rate is not supported.
 613  */
 614 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 615                                        struct audioformat *fp,
 616                                        struct audioformat *match, int rate,
 617                                        snd_pcm_format_t pcm_format)
 618 {
 619         int i;
 620         int score = 0;
 621
 622         if (fp->channels < 1) {
 623                 dev_dbg(&subs->dev->dev,
 624                         "%s: (fmt @%p) no channels\n", __func__, fp);
 625                 return 0;
 626         }
 627
 628         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 629                 dev_dbg(&subs->dev->dev,
 630                         "%s: (fmt @%p) no match for format %d\n", __func__,
 631                         fp, pcm_format);
 632                 return 0;
 633         }
 634
 635         for (i = 0; i < fp->nr_rates; i++) {
 636                 if (fp->rate_table[i] == rate) {
 637                         score++;
 638                         break;
 639                 }
 640         }
 641         if (!score) {
 642                 dev_dbg(&subs->dev->dev,
 643                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 644                         fp, rate);
 645                 return 0;
 646         }
 647
 648         if (fp->channels == match->channels)
 649                 score++;
 650
 651         dev_dbg(&subs->dev->dev,
 652                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 653
 654         return score;
 655 }
 656
 657 /*
 658  * Configure the sync ep using the rate and pcm format of the data ep.
 659  */
 660 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 661 {
 662         int ret;
 663         struct audioformat *fp;
 664         struct audioformat *sync_fp = NULL;
 665         int cur_score = 0;
 666         int sync_period_bytes = subs->period_bytes;
 667         struct snd_usb_substream *sync_subs =
 668                 &subs->stream->substream[subs->direction ^ 1];
 669
 670         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 671             !subs->stream)
 672                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 673                                                    subs->pcm_format,
 674                                                    subs->channels,
 675                                                    subs->period_bytes,
 676                                                    0, 0,
 677                                                    subs->cur_rate,
 678                                                    subs->cur_audiofmt,
 679                                                    NULL);
 680
 681         /* Try to find the best matching audioformat. */
 682         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 683                 int score = match_endpoint_audioformats(subs,
 684                                                         fp, subs->cur_audiofmt,
 685                         subs->cur_rate, subs->pcm_format);
 686
 687                 if (score > cur_score) {
 688                         sync_fp = fp;
 689                         cur_score = score;
 690                 }
 691         }
 692
 693         if (unlikely(sync_fp == NULL)) {
 694                 dev_err(&subs->dev->dev,
 695                         "%s: no valid audioformat for sync ep %x found\n",
 696                         __func__, sync_subs->ep_num);
 697                 return -EINVAL;
 698         }
 699
 700         /*
 701          * Recalculate the period bytes if channel number differ between
 702          * data and sync ep audioformat.
 703          */
 704         if (sync_fp->channels != subs->channels) {
 705                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 706                         sync_fp->channels;
 707                 dev_dbg(&subs->dev->dev,
 708                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 709                         __func__, subs->period_bytes, sync_period_bytes);
 710         }
 711
 712         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 713                                           subs->pcm_format,
 714                                           sync_fp->channels,
 715                                           sync_period_bytes,
 716                                           0, 0,
 717                                           subs->cur_rate,
 718                                           sync_fp,
 719                                           NULL);
 720
 721         return ret;
 722 }
 723
 724 /*
 725  * configure endpoint params
 726  *
 727  * called  during initial setup and upon resume
 728  */
 729 static int configure_endpoint(struct snd_usb_substream *subs)
 730 {
 731         int ret;
 732
 733         /* format changed */
 734         stop_endpoints(subs);
 735         sync_pending_stops(subs);
 736         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 737                                           subs->pcm_format,
 738                                           subs->channels,
 739                                           subs->period_bytes,
 740                                           subs->period_frames,
 741                                           subs->buffer_periods,
 742                                           subs->cur_rate,
 743                                           subs->cur_audiofmt,
 744                                           subs->sync_endpoint);
 745         if (ret < 0)
 746                 return ret;
 747
 748         if (subs->sync_endpoint)
 749                 ret = configure_sync_endpoint(subs);
 750
 751         return ret;
 752 }
 753
 754 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 755 {
 756         int ret;
 757
 758         if (!subs->str_pd)
 759                 return 0;
 760
 761         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 762         if (ret < 0) {
 763                 dev_err(&subs->dev->dev,
 764                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 765                         subs->str_pd->pd_id, state, ret);
 766                 return ret;
 767         }
 768
 769         return 0;
 770 }
 771
 772 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 773 {
 774         int ret;
 775
 776         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 777         if (ret < 0)
 778                 return ret;
 779
 780         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 781         if (ret < 0)
 782                 return ret;
 783
 784         return 0;
 785 }
 786
 787 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 788 {
 789         int ret;
 790
 791         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 792         if (ret < 0)
 793                 return ret;
 794
 795         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 796         if (ret < 0)
 797                 return ret;
 798
 799         return 0;
 800 }
 801
 802 /*
 803  * hw_params callback
 804  *
 805  * allocate a buffer and set the given audio format.
 806  *
 807  * so far we use a physically linear buffer although packetize transfer
 808  * doesn't need a continuous area.
 809  * if sg buffer is supported on the later version of alsa, we'll follow
 810  * that.
 811  */
 812 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 813                              struct snd_pcm_hw_params *hw_params)
 814 {
 815         struct snd_usb_substream *subs = substream->runtime->private_data;
 816         struct audioformat *fmt;
 817         int ret;
 818
 819         ret = snd_media_start_pipeline(subs);
 820         if (ret)
 821                 return ret;
 822
 823         subs->pcm_format = params_format(hw_params);
 824         subs->period_bytes = params_period_bytes(hw_params);
 825         subs->period_frames = params_period_size(hw_params);
 826         subs->buffer_periods = params_periods(hw_params);
 827         subs->channels = params_channels(hw_params);
 828         subs->cur_rate = params_rate(hw_params);
 829
 830         fmt = find_format(subs);
 831         if (!fmt) {
 832                 dev_dbg(&subs->dev->dev,
 833                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 834                            subs->pcm_format, subs->cur_rate, subs->channels);
 835                 ret = -EINVAL;
 836                 goto stop_pipeline;
 837         }
 838
 839         ret = snd_usb_lock_shutdown(subs->stream->chip);
 840         if (ret < 0)
 841                 goto stop_pipeline;
 842
 843         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 844         if (ret < 0)
 845                 goto unlock;
 846
 847         ret = set_format(subs, fmt);
 848         if (ret < 0)
 849                 goto unlock;
 850
 851         subs->interface = fmt->iface;
 852         subs->altset_idx = fmt->altset_idx;
 853         subs->need_setup_ep = true;
 854
 855  unlock:
 856         snd_usb_unlock_shutdown(subs->stream->chip);
 857         if (ret < 0)
 858                 goto stop_pipeline;
 859         return ret;
 860
 861  stop_pipeline:
 862         snd_media_stop_pipeline(subs);
 863         return ret;
 864 }
 865
 866 /*
 867  * hw_free callback
 868  *
 869  * reset the audio format and release the buffer
 870  */
 871 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 872 {
 873         struct snd_usb_substream *subs = substream->runtime->private_data;
 874
 875         snd_media_stop_pipeline(subs);
 876         subs->cur_audiofmt = NULL;
 877         subs->cur_rate = 0;
 878         subs->period_bytes = 0;
 879         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 880                 stop_endpoints(subs);
 881                 sync_pending_stops(subs);
 882                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 883                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 884                 snd_usb_unlock_shutdown(subs->stream->chip);
 885         }
 886
 887         return 0;
 888 }
 889
 890 /*
 891  * prepare callback
 892  *
 893  * only a few subtle things...
 894  */
 895 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 896 {
 897         struct snd_pcm_runtime *runtime = substream->runtime;
 898         struct snd_usb_substream *subs = runtime->private_data;
 899         struct usb_host_interface *alts;
 900         struct usb_interface *iface;
 901         int ret;
 902
 903         if (! subs->cur_audiofmt) {
 904                 dev_err(&subs->dev->dev, "no format is specified!\n");
 905                 return -ENXIO;
 906         }
 907
 908         ret = snd_usb_lock_shutdown(subs->stream->chip);
 909         if (ret < 0)
 910                 return ret;
 911         if (snd_BUG_ON(!subs->data_endpoint)) {
 912                 ret = -EIO;
 913                 goto unlock;
 914         }
 915
 916         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 917         if (ret < 0)
 918                 goto unlock;
 919
 920         ret = set_format(subs, subs->cur_audiofmt);
 921         if (ret < 0)
 922                 goto unlock;
 923
 924         if (subs->need_setup_ep) {
 925
 926                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 927                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 928                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 929                                                subs->cur_audiofmt->iface,
 930                                                alts,
 931                                                subs->cur_audiofmt,
 932                                                subs->cur_rate);
 933                 if (ret < 0)
 934                         goto unlock;
 935
 936                 ret = configure_endpoint(subs);
 937                 if (ret < 0)
 938                         goto unlock;
 939                 subs->need_setup_ep = false;
 940         }
 941
 942         /* some unit conversions in runtime */
 943         subs->data_endpoint->maxframesize =
 944                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 945         subs->data_endpoint->curframesize =
 946                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 947
 948         /* reset the pointer */
 949         subs->hwptr_done = 0;
 950         subs->transfer_done = 0;
 951         subs->last_delay = 0;
 952         subs->last_frame_number = 0;
 953         runtime->delay = 0;
 954
 955         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 956          * updates for all URBs would happen at the same time when starting */
 957         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 958                 ret = start_endpoints(subs);
 959
 960  unlock:
 961         snd_usb_unlock_shutdown(subs->stream->chip);
 962         return ret;
 963 }
 964
 965 static const struct snd_pcm_hardware snd_usb_hardware =
 966 {
 967         .info =                 SNDRV_PCM_INFO_MMAP |
 968                                 SNDRV_PCM_INFO_MMAP_VALID |
 969                                 SNDRV_PCM_INFO_BATCH |
 970                                 SNDRV_PCM_INFO_INTERLEAVED |
 971                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 972                                 SNDRV_PCM_INFO_PAUSE,
 973         .buffer_bytes_max =     1024 * 1024,
 974         .period_bytes_min =     64,
 975         .period_bytes_max =     512 * 1024,
 976         .periods_min =          2,
 977         .periods_max =          1024,
 978 };
 979
 980 static int hw_check_valid_format(struct snd_usb_substream *subs,
 981                                  struct snd_pcm_hw_params *params,
 982                                  struct audioformat *fp)
 983 {
 984         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 985         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 986         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 987         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 988         struct snd_mask check_fmts;
 989         unsigned int ptime;
 990
 991         /* check the format */
 992         snd_mask_none(&check_fmts);
 993         check_fmts.bits[0] = (u32)fp->formats;
 994         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 995         snd_mask_intersect(&check_fmts, fmts);
 996         if (snd_mask_empty(&check_fmts)) {
 997                 hwc_debug("   > check: no supported format %d\n", fp->format);
 998                 return 0;
 999         }
1000         /* check the channels */
1001         if (fp->channels < ct->min || fp->channels > ct->max) {
1002                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1003                 return 0;
1004         }
1005         /* check the rate is within the range */
1006         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1007                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1008                 return 0;
1009         }
1010         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1011                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1012                 return 0;
1013         }
1014         /* check whether the period time is >= the data packet interval */
1015         if (subs->speed != USB_SPEED_FULL) {
1016                 ptime = 125 * (1 << fp->datainterval);
1017                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1018                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1019                         return 0;
1020                 }
1021         }
1022         return 1;
1023 }
1024
1025 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1026                         struct snd_pcm_hw_rule *rule)
1027 {
1028         struct snd_usb_substream *subs = rule->private;
1029         struct audioformat *fp;
1030         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1031         unsigned int rmin, rmax;
1032         int changed;
1033
1034         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1035         changed = 0;
1036         rmin = rmax = 0;
1037         list_for_each_entry(fp, &subs->fmt_list, list) {
1038                 if (!hw_check_valid_format(subs, params, fp))
1039                         continue;
1040                 if (changed++) {
1041                         if (rmin > fp->rate_min)
1042                                 rmin = fp->rate_min;
1043                         if (rmax < fp->rate_max)
1044                                 rmax = fp->rate_max;
1045                 } else {
1046                         rmin = fp->rate_min;
1047                         rmax = fp->rate_max;
1048                 }
1049         }
1050
1051         if (!changed) {
1052                 hwc_debug("  --> get empty\n");
1053                 it->empty = 1;
1054                 return -EINVAL;
1055         }
1056
1057         changed = 0;
1058         if (it->min < rmin) {
1059                 it->min = rmin;
1060                 it->openmin = 0;
1061                 changed = 1;
1062         }
1063         if (it->max > rmax) {
1064                 it->max = rmax;
1065                 it->openmax = 0;
1066                 changed = 1;
1067         }
1068         if (snd_interval_checkempty(it)) {
1069                 it->empty = 1;
1070                 return -EINVAL;
1071         }
1072         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1073         return changed;
1074 }
1075
1076
1077 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1078                             struct snd_pcm_hw_rule *rule)
1079 {
1080         struct snd_usb_substream *subs = rule->private;
1081         struct audioformat *fp;
1082         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1083         unsigned int rmin, rmax;
1084         int changed;
1085
1086         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1087         changed = 0;
1088         rmin = rmax = 0;
1089         list_for_each_entry(fp, &subs->fmt_list, list) {
1090                 if (!hw_check_valid_format(subs, params, fp))
1091                         continue;
1092                 if (changed++) {
1093                         if (rmin > fp->channels)
1094                                 rmin = fp->channels;
1095                         if (rmax < fp->channels)
1096                                 rmax = fp->channels;
1097                 } else {
1098                         rmin = fp->channels;
1099                         rmax = fp->channels;
1100                 }
1101         }
1102
1103         if (!changed) {
1104                 hwc_debug("  --> get empty\n");
1105                 it->empty = 1;
1106                 return -EINVAL;
1107         }
1108
1109         changed = 0;
1110         if (it->min < rmin) {
1111                 it->min = rmin;
1112                 it->openmin = 0;
1113                 changed = 1;
1114         }
1115         if (it->max > rmax) {
1116                 it->max = rmax;
1117                 it->openmax = 0;
1118                 changed = 1;
1119         }
1120         if (snd_interval_checkempty(it)) {
1121                 it->empty = 1;
1122                 return -EINVAL;
1123         }
1124         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1125         return changed;
1126 }
1127
1128 static int hw_rule_format(struct snd_pcm_hw_params *params,
1129                           struct snd_pcm_hw_rule *rule)
1130 {
1131         struct snd_usb_substream *subs = rule->private;
1132         struct audioformat *fp;
1133         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1134         u64 fbits;
1135         u32 oldbits[2];
1136         int changed;
1137
1138         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1139         fbits = 0;
1140         list_for_each_entry(fp, &subs->fmt_list, list) {
1141                 if (!hw_check_valid_format(subs, params, fp))
1142                         continue;
1143                 fbits |= fp->formats;
1144         }
1145
1146         oldbits[0] = fmt->bits[0];
1147         oldbits[1] = fmt->bits[1];
1148         fmt->bits[0] &= (u32)fbits;
1149         fmt->bits[1] &= (u32)(fbits >> 32);
1150         if (!fmt->bits[0] && !fmt->bits[1]) {
1151                 hwc_debug("  --> get empty\n");
1152                 return -EINVAL;
1153         }
1154         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1155         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1156         return changed;
1157 }
1158
1159 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1160                                struct snd_pcm_hw_rule *rule)
1161 {
1162         struct snd_usb_substream *subs = rule->private;
1163         struct audioformat *fp;
1164         struct snd_interval *it;
1165         unsigned char min_datainterval;
1166         unsigned int pmin;
1167         int changed;
1168
1169         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1170         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1171         min_datainterval = 0xff;
1172         list_for_each_entry(fp, &subs->fmt_list, list) {
1173                 if (!hw_check_valid_format(subs, params, fp))
1174                         continue;
1175                 min_datainterval = min(min_datainterval, fp->datainterval);
1176         }
1177         if (min_datainterval == 0xff) {
1178                 hwc_debug("  --> get empty\n");
1179                 it->empty = 1;
1180                 return -EINVAL;
1181         }
1182         pmin = 125 * (1 << min_datainterval);
1183         changed = 0;
1184         if (it->min < pmin) {
1185                 it->min = pmin;
1186                 it->openmin = 0;
1187                 changed = 1;
1188         }
1189         if (snd_interval_checkempty(it)) {
1190                 it->empty = 1;
1191                 return -EINVAL;
1192         }
1193         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1194         return changed;
1195 }
1196
1197 /*
1198  *  If the device supports unusual bit rates, does the request meet these?
1199  */
1200 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1201                                   struct snd_usb_substream *subs)
1202 {
1203         struct audioformat *fp;
1204         int *rate_list;
1205         int count = 0, needs_knot = 0;
1206         int err;
1207
1208         kfree(subs->rate_list.list);
1209         subs->rate_list.list = NULL;
1210
1211         list_for_each_entry(fp, &subs->fmt_list, list) {
1212                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1213                         return 0;
1214                 count += fp->nr_rates;
1215                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1216                         needs_knot = 1;
1217         }
1218         if (!needs_knot)
1219                 return 0;
1220
1221         subs->rate_list.list = rate_list =
1222                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1223         if (!subs->rate_list.list)
1224                 return -ENOMEM;
1225         subs->rate_list.count = count;
1226         subs->rate_list.mask = 0;
1227         count = 0;
1228         list_for_each_entry(fp, &subs->fmt_list, list) {
1229                 int i;
1230                 for (i = 0; i < fp->nr_rates; i++)
1231                         rate_list[count++] = fp->rate_table[i];
1232         }
1233         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1234                                          &subs->rate_list);
1235         if (err < 0)
1236                 return err;
1237
1238         return 0;
1239 }
1240
1241
1242 /*
1243  * set up the runtime hardware information.
1244  */
1245
1246 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1247 {
1248         struct audioformat *fp;
1249         unsigned int pt, ptmin;
1250         int param_period_time_if_needed;
1251         int err;
1252
1253         runtime->hw.formats = subs->formats;
1254
1255         runtime->hw.rate_min = 0x7fffffff;
1256         runtime->hw.rate_max = 0;
1257         runtime->hw.channels_min = 256;
1258         runtime->hw.channels_max = 0;
1259         runtime->hw.rates = 0;
1260         ptmin = UINT_MAX;
1261         /* check min/max rates and channels */
1262         list_for_each_entry(fp, &subs->fmt_list, list) {
1263                 runtime->hw.rates |= fp->rates;
1264                 if (runtime->hw.rate_min > fp->rate_min)
1265                         runtime->hw.rate_min = fp->rate_min;
1266                 if (runtime->hw.rate_max < fp->rate_max)
1267                         runtime->hw.rate_max = fp->rate_max;
1268                 if (runtime->hw.channels_min > fp->channels)
1269                         runtime->hw.channels_min = fp->channels;
1270                 if (runtime->hw.channels_max < fp->channels)
1271                         runtime->hw.channels_max = fp->channels;
1272                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1273                         /* FIXME: there might be more than one audio formats... */
1274                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1275                                 fp->frame_size;
1276                 }
1277                 pt = 125 * (1 << fp->datainterval);
1278                 ptmin = min(ptmin, pt);
1279         }
1280
1281         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1282         if (subs->speed == USB_SPEED_FULL)
1283                 /* full speed devices have fixed data packet interval */
1284                 ptmin = 1000;
1285         if (ptmin == 1000)
1286                 /* if period time doesn't go below 1 ms, no rules needed */
1287                 param_period_time_if_needed = -1;
1288
1289         err = snd_pcm_hw_constraint_minmax(runtime,
1290                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1291                                            ptmin, UINT_MAX);
1292         if (err < 0)
1293                 return err;
1294
1295         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1296                                   hw_rule_rate, subs,
1297                                   SNDRV_PCM_HW_PARAM_FORMAT,
1298                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1299                                   param_period_time_if_needed,
1300                                   -1);
1301         if (err < 0)
1302                 return err;
1303         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1304                                   hw_rule_channels, subs,
1305                                   SNDRV_PCM_HW_PARAM_FORMAT,
1306                                   SNDRV_PCM_HW_PARAM_RATE,
1307                                   param_period_time_if_needed,
1308                                   -1);
1309         if (err < 0)
1310                 return err;
1311         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1312                                   hw_rule_format, subs,
1313                                   SNDRV_PCM_HW_PARAM_RATE,
1314                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1315                                   param_period_time_if_needed,
1316                                   -1);
1317         if (err < 0)
1318                 return err;
1319         if (param_period_time_if_needed >= 0) {
1320                 err = snd_pcm_hw_rule_add(runtime, 0,
1321                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1322                                           hw_rule_period_time, subs,
1323                                           SNDRV_PCM_HW_PARAM_FORMAT,
1324                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1325                                           SNDRV_PCM_HW_PARAM_RATE,
1326                                           -1);
1327                 if (err < 0)
1328                         return err;
1329         }
1330         err = snd_usb_pcm_check_knot(runtime, subs);
1331         if (err < 0)
1332                 return err;
1333
1334         return snd_usb_autoresume(subs->stream->chip);
1335 }
1336
1337 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1338 {
1339         int direction = substream->stream;
1340         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1341         struct snd_pcm_runtime *runtime = substream->runtime;
1342         struct snd_usb_substream *subs = &as->substream[direction];
1343         int ret;
1344
1345         subs->interface = -1;
1346         subs->altset_idx = 0;
1347         runtime->hw = snd_usb_hardware;
1348         runtime->private_data = subs;
1349         subs->pcm_substream = substream;
1350         /* runtime PM is also done there */
1351
1352         /* initialize DSD/DOP context */
1353         subs->dsd_dop.byte_idx = 0;
1354         subs->dsd_dop.channel = 0;
1355         subs->dsd_dop.marker = 1;
1356
1357         ret = setup_hw_info(runtime, subs);
1358         if (ret == 0) {
1359                 ret = snd_media_stream_init(subs, as->pcm, direction);
1360                 if (ret)
1361                         snd_usb_autosuspend(subs->stream->chip);
1362         }
1363         return ret;
1364 }
1365
1366 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1367 {
1368         int direction = substream->stream;
1369         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1370         struct snd_usb_substream *subs = &as->substream[direction];
1371         int ret;
1372
1373         snd_media_stop_pipeline(subs);
1374
1375         if (!as->chip->keep_iface &&
1376             subs->interface >= 0 &&
1377             !snd_usb_lock_shutdown(subs->stream->chip)) {
1378                 usb_set_interface(subs->dev, subs->interface, 0);
1379                 subs->interface = -1;
1380                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1381                 snd_usb_unlock_shutdown(subs->stream->chip);
1382                 if (ret < 0)
1383                         return ret;
1384         }
1385
1386         subs->pcm_substream = NULL;
1387         snd_usb_autosuspend(subs->stream->chip);
1388
1389         return 0;
1390 }
1391
1392 /* Since a URB can handle only a single linear buffer, we must use double
1393  * buffering when the data to be transferred overflows the buffer boundary.
1394  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1395  * for all URBs.
1396  */
1397 static void retire_capture_urb(struct snd_usb_substream *subs,
1398                                struct urb *urb)
1399 {
1400         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1401         unsigned int stride, frames, bytes, oldptr;
1402         int i, period_elapsed = 0;
1403         unsigned long flags;
1404         unsigned char *cp;
1405         int current_frame_number;
1406
1407         /* read frame number here, update pointer in critical section */
1408         current_frame_number = usb_get_current_frame_number(subs->dev);
1409
1410         stride = runtime->frame_bits >> 3;
1411
1412         for (i = 0; i < urb->number_of_packets; i++) {
1413                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1414                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1415                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1416                                 i, urb->iso_frame_desc[i].status);
1417                         // continue;
1418                 }
1419                 bytes = urb->iso_frame_desc[i].actual_length;
1420                 frames = bytes / stride;
1421                 if (!subs->txfr_quirk)
1422                         bytes = frames * stride;
1423                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1424                         int oldbytes = bytes;
1425                         bytes = frames * stride;
1426                         dev_warn_ratelimited(&subs->dev->dev,
1427                                  "Corrected urb data len. %d->%d\n",
1428                                                         oldbytes, bytes);
1429                 }
1430                 /* update the current pointer */
1431                 spin_lock_irqsave(&subs->lock, flags);
1432                 oldptr = subs->hwptr_done;
1433                 subs->hwptr_done += bytes;
1434                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1435                         subs->hwptr_done -= runtime->buffer_size * stride;
1436                 frames = (bytes + (oldptr % stride)) / stride;
1437                 subs->transfer_done += frames;
1438                 if (subs->transfer_done >= runtime->period_size) {
1439                         subs->transfer_done -= runtime->period_size;
1440                         period_elapsed = 1;
1441                 }
1442                 /* capture delay is by construction limited to one URB,
1443                  * reset delays here
1444                  */
1445                 runtime->delay = subs->last_delay = 0;
1446
1447                 /* realign last_frame_number */
1448                 subs->last_frame_number = current_frame_number;
1449                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1450
1451                 spin_unlock_irqrestore(&subs->lock, flags);
1452                 /* copy a data chunk */
1453                 if (oldptr + bytes > runtime->buffer_size * stride) {
1454                         unsigned int bytes1 =
1455                                         runtime->buffer_size * stride - oldptr;
1456                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1457                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1458                 } else {
1459                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1460                 }
1461         }
1462
1463         if (period_elapsed)
1464                 snd_pcm_period_elapsed(subs->pcm_substream);
1465 }
1466
1467 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1468                                              struct urb *urb, unsigned int bytes)
1469 {
1470         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1471         unsigned int stride = runtime->frame_bits >> 3;
1472         unsigned int dst_idx = 0;
1473         unsigned int src_idx = subs->hwptr_done;
1474         unsigned int wrap = runtime->buffer_size * stride;
1475         u8 *dst = urb->transfer_buffer;
1476         u8 *src = runtime->dma_area;
1477         u8 marker[] = { 0x05, 0xfa };
1478
1479         /*
1480          * The DSP DOP format defines a way to transport DSD samples over
1481          * normal PCM data endpoints. It requires stuffing of marker bytes
1482          * (0x05 and 0xfa, alternating per sample frame), and then expects
1483          * 2 additional bytes of actual payload. The whole frame is stored
1484          * LSB.
1485          *
1486          * Hence, for a stereo transport, the buffer layout looks like this,
1487          * where L refers to left channel samples and R to right.
1488          *
1489          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1490          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1491          *   .....
1492          *
1493          */
1494
1495         while (bytes--) {
1496                 if (++subs->dsd_dop.byte_idx == 3) {
1497                         /* frame boundary? */
1498                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1499                         src_idx += 2;
1500                         subs->dsd_dop.byte_idx = 0;
1501
1502                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1503                                 /* alternate the marker */
1504                                 subs->dsd_dop.marker++;
1505                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1506                                 subs->dsd_dop.channel = 0;
1507                         }
1508                 } else {
1509                         /* stuff the DSD payload */
1510                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1511
1512                         if (subs->cur_audiofmt->dsd_bitrev)
1513                                 dst[dst_idx++] = bitrev8(src[idx]);
1514                         else
1515                                 dst[dst_idx++] = src[idx];
1516
1517                         subs->hwptr_done++;
1518                 }
1519         }
1520         if (subs->hwptr_done >= runtime->buffer_size * stride)
1521                 subs->hwptr_done -= runtime->buffer_size * stride;
1522 }
1523
1524 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1525                         int offset, int stride, unsigned int bytes)
1526 {
1527         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1528
1529         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1530                 /* err, the transferred area goes over buffer boundary. */
1531                 unsigned int bytes1 =
1532                         runtime->buffer_size * stride - subs->hwptr_done;
1533                 memcpy(urb->transfer_buffer + offset,
1534                        runtime->dma_area + subs->hwptr_done, bytes1);
1535                 memcpy(urb->transfer_buffer + offset + bytes1,
1536                        runtime->dma_area, bytes - bytes1);
1537         } else {
1538                 memcpy(urb->transfer_buffer + offset,
1539                        runtime->dma_area + subs->hwptr_done, bytes);
1540         }
1541         subs->hwptr_done += bytes;
1542         if (subs->hwptr_done >= runtime->buffer_size * stride)
1543                 subs->hwptr_done -= runtime->buffer_size * stride;
1544 }
1545
1546 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1547                                       struct urb *urb, int stride,
1548                                       unsigned int bytes)
1549 {
1550         __le32 packet_length;
1551         int i;
1552
1553         /* Put __le32 length descriptor at start of each packet. */
1554         for (i = 0; i < urb->number_of_packets; i++) {
1555                 unsigned int length = urb->iso_frame_desc[i].length;
1556                 unsigned int offset = urb->iso_frame_desc[i].offset;
1557
1558                 packet_length = cpu_to_le32(length);
1559                 offset += i * sizeof(packet_length);
1560                 urb->iso_frame_desc[i].offset = offset;
1561                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1562                 memcpy(urb->transfer_buffer + offset,
1563                        &packet_length, sizeof(packet_length));
1564                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1565                             stride, length);
1566         }
1567         /* Adjust transfer size accordingly. */
1568         bytes += urb->number_of_packets * sizeof(packet_length);
1569         return bytes;
1570 }
1571
1572 static void prepare_playback_urb(struct snd_usb_substream *subs,
1573                                  struct urb *urb)
1574 {
1575         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1576         struct snd_usb_endpoint *ep = subs->data_endpoint;
1577         struct snd_urb_ctx *ctx = urb->context;
1578         unsigned int counts, frames, bytes;
1579         int i, stride, period_elapsed = 0;
1580         unsigned long flags;
1581
1582         stride = runtime->frame_bits >> 3;
1583
1584         frames = 0;
1585         urb->number_of_packets = 0;
1586         spin_lock_irqsave(&subs->lock, flags);
1587         subs->frame_limit += ep->max_urb_frames;
1588         for (i = 0; i < ctx->packets; i++) {
1589                 if (ctx->packet_size[i])
1590                         counts = ctx->packet_size[i];
1591                 else if (ep->sync_master)
1592                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1593                 else
1594                         counts = snd_usb_endpoint_next_packet_size(ep);
1595
1596                 /* set up descriptor */
1597                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1598                 urb->iso_frame_desc[i].length = counts * ep->stride;
1599                 frames += counts;
1600                 urb->number_of_packets++;
1601                 subs->transfer_done += counts;
1602                 if (subs->transfer_done >= runtime->period_size) {
1603                         subs->transfer_done -= runtime->period_size;
1604                         subs->frame_limit = 0;
1605                         period_elapsed = 1;
1606                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1607                                 if (subs->transfer_done > 0) {
1608                                         /* FIXME: fill-max mode is not
1609                                          * supported yet */
1610                                         frames -= subs->transfer_done;
1611                                         counts -= subs->transfer_done;
1612                                         urb->iso_frame_desc[i].length =
1613                                                 counts * ep->stride;
1614                                         subs->transfer_done = 0;
1615                                 }
1616                                 i++;
1617                                 if (i < ctx->packets) {
1618                                         /* add a transfer delimiter */
1619                                         urb->iso_frame_desc[i].offset =
1620                                                 frames * ep->stride;
1621                                         urb->iso_frame_desc[i].length = 0;
1622                                         urb->number_of_packets++;
1623                                 }
1624                                 break;
1625                         }
1626                 }
1627                 /* finish at the period boundary or after enough frames */
1628                 if ((period_elapsed ||
1629                                 subs->transfer_done >= subs->frame_limit) &&
1630                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1631                         break;
1632         }
1633         bytes = frames * ep->stride;
1634
1635         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1636                      subs->cur_audiofmt->dsd_dop)) {
1637                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1638         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1639                            subs->cur_audiofmt->dsd_bitrev)) {
1640                 /* bit-reverse the bytes */
1641                 u8 *buf = urb->transfer_buffer;
1642                 for (i = 0; i < bytes; i++) {
1643                         int idx = (subs->hwptr_done + i)
1644                                 % (runtime->buffer_size * stride);
1645                         buf[i] = bitrev8(runtime->dma_area[idx]);
1646                 }
1647
1648                 subs->hwptr_done += bytes;
1649                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1650                         subs->hwptr_done -= runtime->buffer_size * stride;
1651         } else {
1652                 /* usual PCM */
1653                 if (!subs->tx_length_quirk)
1654                         copy_to_urb(subs, urb, 0, stride, bytes);
1655                 else
1656                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1657                         /* bytes is now amount of outgoing data */
1658         }
1659
1660         /* update delay with exact number of samples queued */
1661         runtime->delay = subs->last_delay;
1662         runtime->delay += frames;
1663         subs->last_delay = runtime->delay;
1664
1665         /* realign last_frame_number */
1666         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1667         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1668
1669         if (subs->trigger_tstamp_pending_update) {
1670                 /* this is the first actual URB submitted,
1671                  * update trigger timestamp to reflect actual start time
1672                  */
1673                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1674                 subs->trigger_tstamp_pending_update = false;
1675         }
1676
1677         spin_unlock_irqrestore(&subs->lock, flags);
1678         urb->transfer_buffer_length = bytes;
1679         if (period_elapsed)
1680                 snd_pcm_period_elapsed(subs->pcm_substream);
1681 }
1682
1683 /*
1684  * process after playback data complete
1685  * - decrease the delay count again
1686  */
1687 static void retire_playback_urb(struct snd_usb_substream *subs,
1688                                struct urb *urb)
1689 {
1690         unsigned long flags;
1691         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1692         struct snd_usb_endpoint *ep = subs->data_endpoint;
1693         int processed = urb->transfer_buffer_length / ep->stride;
1694         int est_delay;
1695
1696         /* ignore the delay accounting when procssed=0 is given, i.e.
1697          * silent payloads are procssed before handling the actual data
1698          */
1699         if (!processed)
1700                 return;
1701
1702         spin_lock_irqsave(&subs->lock, flags);
1703         if (!subs->last_delay)
1704                 goto out; /* short path */
1705
1706         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1707         /* update delay with exact number of samples played */
1708         if (processed > subs->last_delay)
1709                 subs->last_delay = 0;
1710         else
1711                 subs->last_delay -= processed;
1712         runtime->delay = subs->last_delay;
1713
1714         /*
1715          * Report when delay estimate is off by more than 2ms.
1716          * The error should be lower than 2ms since the estimate relies
1717          * on two reads of a counter updated every ms.
1718          */
1719         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1720                 dev_dbg_ratelimited(&subs->dev->dev,
1721                         "delay: estimated %d, actual %d\n",
1722                         est_delay, subs->last_delay);
1723
1724         if (!subs->running) {
1725                 /* update last_frame_number for delay counting here since
1726                  * prepare_playback_urb won't be called during pause
1727                  */
1728                 subs->last_frame_number =
1729                         usb_get_current_frame_number(subs->dev) & 0xff;
1730         }
1731
1732  out:
1733         spin_unlock_irqrestore(&subs->lock, flags);
1734 }
1735
1736 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1737                                               int cmd)
1738 {
1739         struct snd_usb_substream *subs = substream->runtime->private_data;
1740
1741         switch (cmd) {
1742         case SNDRV_PCM_TRIGGER_START:
1743                 subs->trigger_tstamp_pending_update = true;
1744                 /* fall through */
1745         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1746                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1747                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1748                 subs->running = 1;
1749                 return 0;
1750         case SNDRV_PCM_TRIGGER_STOP:
1751                 stop_endpoints(subs);
1752                 subs->running = 0;
1753                 return 0;
1754         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1755                 subs->data_endpoint->prepare_data_urb = NULL;
1756                 /* keep retire_data_urb for delay calculation */
1757                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1758                 subs->running = 0;
1759                 return 0;
1760         case SNDRV_PCM_TRIGGER_SUSPEND:
1761                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1762                         stop_endpoints(subs);
1763                         subs->need_setup_fmt = true;
1764                         return 0;
1765                 }
1766                 break;
1767         }
1768
1769         return -EINVAL;
1770 }
1771
1772 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1773                                              int cmd)
1774 {
1775         int err;
1776         struct snd_usb_substream *subs = substream->runtime->private_data;
1777
1778         switch (cmd) {
1779         case SNDRV_PCM_TRIGGER_START:
1780                 err = start_endpoints(subs);
1781                 if (err < 0)
1782                         return err;
1783
1784                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1785                 subs->running = 1;
1786                 return 0;
1787         case SNDRV_PCM_TRIGGER_STOP:
1788                 stop_endpoints(subs);
1789                 subs->running = 0;
1790                 return 0;
1791         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1792                 subs->data_endpoint->retire_data_urb = NULL;
1793                 subs->running = 0;
1794                 return 0;
1795         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1796                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1797                 subs->running = 1;
1798                 return 0;
1799         case SNDRV_PCM_TRIGGER_SUSPEND:
1800                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1801                         stop_endpoints(subs);
1802                         subs->need_setup_fmt = true;
1803                         return 0;
1804                 }
1805                 break;
1806         }
1807
1808         return -EINVAL;
1809 }
1810
1811 static const struct snd_pcm_ops snd_usb_playback_ops = {
1812         .open =         snd_usb_pcm_open,
1813         .close =        snd_usb_pcm_close,
1814         .hw_params =    snd_usb_hw_params,
1815         .hw_free =      snd_usb_hw_free,
1816         .prepare =      snd_usb_pcm_prepare,
1817         .trigger =      snd_usb_substream_playback_trigger,
1818         .sync_stop =    snd_usb_pcm_sync_stop,
1819         .pointer =      snd_usb_pcm_pointer,
1820 };
1821
1822 static const struct snd_pcm_ops snd_usb_capture_ops = {
1823         .open =         snd_usb_pcm_open,
1824         .close =        snd_usb_pcm_close,
1825         .hw_params =    snd_usb_hw_params,
1826         .hw_free =      snd_usb_hw_free,
1827         .prepare =      snd_usb_pcm_prepare,
1828         .trigger =      snd_usb_substream_capture_trigger,
1829         .sync_stop =    snd_usb_pcm_sync_stop,
1830         .pointer =      snd_usb_pcm_pointer,
1831 };
1832
1833 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1834 {
1835         const struct snd_pcm_ops *ops;
1836
1837         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1838                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1839         snd_pcm_set_ops(pcm, stream, ops);
1840 }
1841
1842 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1843 {
1844         struct snd_pcm *pcm = subs->stream->pcm;
1845         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1846         struct device *dev = subs->dev->bus->controller;
1847
1848         if (snd_usb_use_vmalloc)
1849                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1850                                            NULL, 0, 0);
1851         else
1852                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1853                                            dev, 64*1024, 512*1024);
1854 }