sound/usb/pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/slab.h>
   7 #include <linux/bitrev.h>
   8 #include <linux/ratelimit.h>
   9 #include <linux/usb.h>
  10 #include <linux/usb/audio.h>
  11 #include <linux/usb/audio-v2.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16
  17 #include "usbaudio.h"
  18 #include "card.h"
  19 #include "quirks.h"
  20 #include "debug.h"
  21 #include "endpoint.h"
  22 #include "helper.h"
  23 #include "pcm.h"
  24 #include "clock.h"
  25 #include "power.h"
  26 #include "media.h"
  27
  28 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  30
  31 /* return the estimated delay based on USB frame counters */
  32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33                                     unsigned int rate)
  34 {
  35         int current_frame_number;
  36         int frame_diff;
  37         int est_delay;
  38
  39         if (!subs->last_delay)
  40                 return 0; /* short path */
  41
  42         current_frame_number = usb_get_current_frame_number(subs->dev);
  43         /*
  44          * HCD implementations use different widths, use lower 8 bits.
  45          * The delay will be managed up to 256ms, which is more than
  46          * enough
  47          */
  48         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  49
  50         /* Approximation based on number of samples per USB frame (ms),
  51            some truncation for 44.1 but the estimate is good enough */
  52         est_delay =  frame_diff * rate / 1000;
  53         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  54                 est_delay = subs->last_delay - est_delay;
  55         else
  56                 est_delay = subs->last_delay + est_delay;
  57
  58         if (est_delay < 0)
  59                 est_delay = 0;
  60         return est_delay;
  61 }
  62
  63 /*
  64  * return the current pcm pointer.  just based on the hwptr_done value.
  65  */
  66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  67 {
  68         struct snd_usb_substream *subs = substream->runtime->private_data;
  69         unsigned int hwptr_done;
  70
  71         if (atomic_read(&subs->stream->chip->shutdown))
  72                 return SNDRV_PCM_POS_XRUN;
  73         spin_lock(&subs->lock);
  74         hwptr_done = subs->hwptr_done;
  75         substream->runtime->delay = snd_usb_pcm_delay(subs,
  76                                                 substream->runtime->rate);
  77         spin_unlock(&subs->lock);
  78         return hwptr_done / (substream->runtime->frame_bits >> 3);
  79 }
  80
  81 /*
  82  * find a matching audio format
  83  */
  84 static struct audioformat *find_format(struct snd_usb_substream *subs)
  85 {
  86         struct audioformat *fp;
  87         struct audioformat *found = NULL;
  88         int cur_attr = 0, attr;
  89
  90         list_for_each_entry(fp, &subs->fmt_list, list) {
  91                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
  92                         continue;
  93                 if (fp->channels != subs->channels)
  94                         continue;
  95                 if (subs->cur_rate < fp->rate_min ||
  96                     subs->cur_rate > fp->rate_max)
  97                         continue;
  98                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  99                         unsigned int i;
 100                         for (i = 0; i < fp->nr_rates; i++)
 101                                 if (fp->rate_table[i] == subs->cur_rate)
 102                                         break;
 103                         if (i >= fp->nr_rates)
 104                                 continue;
 105                 }
 106                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 107                 if (! found) {
 108                         found = fp;
 109                         cur_attr = attr;
 110                         continue;
 111                 }
 112                 /* avoid async out and adaptive in if the other method
 113                  * supports the same format.
 114                  * this is a workaround for the case like
 115                  * M-audio audiophile USB.
 116                  */
 117                 if (attr != cur_attr) {
 118                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 119                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 120                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 121                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 122                                 continue;
 123                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 127                                 found = fp;
 128                                 cur_attr = attr;
 129                                 continue;
 130                         }
 131                 }
 132                 /* find the format with the largest max. packet size */
 133                 if (fp->maxpacksize > found->maxpacksize) {
 134                         found = fp;
 135                         cur_attr = attr;
 136                 }
 137         }
 138         return found;
 139 }
 140
 141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 142                          struct usb_host_interface *alts,
 143                          struct audioformat *fmt)
 144 {
 145         struct usb_device *dev = chip->dev;
 146         unsigned int ep;
 147         unsigned char data[1];
 148         int err;
 149
 150         if (get_iface_desc(alts)->bNumEndpoints < 1)
 151                 return -EINVAL;
 152         ep = get_endpoint(alts, 0)->bEndpointAddress;
 153
 154         data[0] = 1;
 155         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 156                               USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 157                               UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 158                               data, sizeof(data));
 159         if (err < 0) {
 160                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 161                               iface, ep);
 162                 return err;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 169                          struct usb_host_interface *alts,
 170                          struct audioformat *fmt)
 171 {
 172         struct usb_device *dev = chip->dev;
 173         unsigned char data[1];
 174         int err;
 175
 176         data[0] = 1;
 177         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 178                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 179                               UAC2_EP_CS_PITCH << 8, 0,
 180                               data, sizeof(data));
 181         if (err < 0) {
 182                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 183                               iface, fmt->altsetting);
 184                 return err;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /*
 191  * initialize the pitch control and sample rate
 192  */
 193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 194                        struct usb_host_interface *alts,
 195                        struct audioformat *fmt)
 196 {
 197         /* if endpoint doesn't have pitch control, bail out */
 198         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199                 return 0;
 200
 201         switch (fmt->protocol) {
 202         case UAC_VERSION_1:
 203         default:
 204                 return init_pitch_v1(chip, iface, alts, fmt);
 205
 206         case UAC_VERSION_2:
 207                 return init_pitch_v2(chip, iface, alts, fmt);
 208         }
 209 }
 210
 211 static int start_endpoints(struct snd_usb_substream *subs)
 212 {
 213         int err;
 214
 215         if (!subs->data_endpoint)
 216                 return -EINVAL;
 217
 218         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 219                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 220
 221                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 222
 223                 ep->data_subs = subs;
 224                 err = snd_usb_endpoint_start(ep);
 225                 if (err < 0) {
 226                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 227                         return err;
 228                 }
 229         }
 230
 231         if (subs->sync_endpoint &&
 232             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 233                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 234
 235                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 236                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 237                         err = usb_set_interface(subs->dev,
 238                                                 subs->sync_endpoint->iface,
 239                                                 subs->sync_endpoint->altsetting);
 240                         if (err < 0) {
 241                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 242                                 dev_err(&subs->dev->dev,
 243                                            "%d:%d: cannot set interface (%d)\n",
 244                                            subs->sync_endpoint->iface,
 245                                            subs->sync_endpoint->altsetting, err);
 246                                 return -EIO;
 247                         }
 248                 }
 249
 250                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 251
 252                 ep->sync_slave = subs->data_endpoint;
 253                 err = snd_usb_endpoint_start(ep);
 254                 if (err < 0) {
 255                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 256                         return err;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 264 {
 265         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 266                 snd_usb_endpoint_stop(subs->sync_endpoint);
 267
 268         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 269                 snd_usb_endpoint_stop(subs->data_endpoint);
 270
 271         if (wait) {
 272                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 273                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 274         }
 275 }
 276
 277 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 278                                      unsigned int altsetting,
 279                                      struct usb_host_interface **alts,
 280                                      unsigned int *ep)
 281 {
 282         struct usb_interface *iface;
 283         struct usb_interface_descriptor *altsd;
 284         struct usb_endpoint_descriptor *epd;
 285
 286         iface = usb_ifnum_to_if(dev, ifnum);
 287         if (!iface || iface->num_altsetting < altsetting + 1)
 288                 return -ENOENT;
 289         *alts = &iface->altsetting[altsetting];
 290         altsd = get_iface_desc(*alts);
 291         if (altsd->bAlternateSetting != altsetting ||
 292             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 293             (altsd->bInterfaceSubClass != 2 &&
 294              altsd->bInterfaceProtocol != 2   ) ||
 295             altsd->bNumEndpoints < 1)
 296                 return -ENOENT;
 297         epd = get_endpoint(*alts, 0);
 298         if (!usb_endpoint_is_isoc_in(epd) ||
 299             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 300                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 301                 return -ENOENT;
 302         *ep = epd->bEndpointAddress;
 303         return 0;
 304 }
 305
 306 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 307  * applies. Returns 1 if a quirk was found.
 308  */
 309 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 310                                          struct usb_device *dev,
 311                                          struct usb_interface_descriptor *altsd,
 312                                          unsigned int attr)
 313 {
 314         struct usb_host_interface *alts;
 315         struct usb_interface *iface;
 316         unsigned int ep;
 317         unsigned int ifnum;
 318
 319         /* Implicit feedback sync EPs consumers are always playback EPs */
 320         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 321                 return 0;
 322
 323         switch (subs->stream->chip->usb_id) {
 324         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 325         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 326                 ep = 0x81;
 327                 ifnum = 3;
 328                 goto add_sync_ep_from_ifnum;
 329         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 330         case USB_ID(0x0763, 0x2081):
 331                 ep = 0x81;
 332                 ifnum = 2;
 333                 goto add_sync_ep_from_ifnum;
 334         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 335                 ep = 0x86;
 336                 ifnum = 2;
 337                 goto add_sync_ep_from_ifnum;
 338         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 339                 ep = 0x81;
 340                 ifnum = 2;
 341                 goto add_sync_ep_from_ifnum;
 342         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 343         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 344                 ep = 0x81;
 345                 ifnum = 1;
 346                 goto add_sync_ep_from_ifnum;
 347         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
 348                 ep = 0x84;
 349                 ifnum = 0;
 350                 goto add_sync_ep_from_ifnum;
 351         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 352                 /* BOSS Katana amplifiers do not need quirks */
 353                 return 0;
 354         }
 355
 356         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 357             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 358             altsd->bInterfaceProtocol == 2 &&
 359             altsd->bNumEndpoints == 1 &&
 360             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 361             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 362                                       altsd->bAlternateSetting,
 363                                       &alts, &ep) >= 0) {
 364                 goto add_sync_ep;
 365         }
 366
 367         /* No quirk */
 368         return 0;
 369
 370 add_sync_ep_from_ifnum:
 371         iface = usb_ifnum_to_if(dev, ifnum);
 372
 373         if (!iface || iface->num_altsetting == 0)
 374                 return -EINVAL;
 375
 376         alts = &iface->altsetting[1];
 377
 378 add_sync_ep:
 379         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 380                                                    alts, ep, !subs->direction,
 381                                                    SND_USB_ENDPOINT_TYPE_DATA);
 382         if (!subs->sync_endpoint)
 383                 return -EINVAL;
 384
 385         subs->data_endpoint->sync_master = subs->sync_endpoint;
 386
 387         return 1;
 388 }
 389
 390 static int set_sync_endpoint(struct snd_usb_substream *subs,
 391                              struct audioformat *fmt,
 392                              struct usb_device *dev,
 393                              struct usb_host_interface *alts,
 394                              struct usb_interface_descriptor *altsd)
 395 {
 396         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 397         unsigned int ep, attr;
 398         bool implicit_fb;
 399         int err;
 400
 401         /* we need a sync pipe in async OUT or adaptive IN mode */
 402         /* check the number of EP, since some devices have broken
 403          * descriptors which fool us.  if it has only one EP,
 404          * assume it as adaptive-out or sync-in.
 405          */
 406         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 407
 408         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 409                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 410
 411                 /*
 412                  * In these modes the notion of sync_endpoint is irrelevant.
 413                  * Reset pointers to avoid using stale data from previously
 414                  * used settings, e.g. when configuration and endpoints were
 415                  * changed
 416                  */
 417
 418                 subs->sync_endpoint = NULL;
 419                 subs->data_endpoint->sync_master = NULL;
 420         }
 421
 422         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 423         if (err < 0)
 424                 return err;
 425
 426         /* endpoint set by quirk */
 427         if (err > 0)
 428                 return 0;
 429
 430         if (altsd->bNumEndpoints < 2)
 431                 return 0;
 432
 433         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 434                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 435             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 436                 return 0;
 437
 438         /*
 439          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 440          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 441          * error fall back to SYNC mode and don't create sync endpoint
 442          */
 443
 444         /* check sync-pipe endpoint */
 445         /* ... and check descriptor size before accessing bSynchAddress
 446            because there is a version of the SB Audigy 2 NX firmware lacking
 447            the audio fields in the endpoint descriptors */
 448         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 449             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 450              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 451                 dev_err(&dev->dev,
 452                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 453                            fmt->iface, fmt->altsetting,
 454                            get_endpoint(alts, 1)->bmAttributes,
 455                            get_endpoint(alts, 1)->bLength,
 456                            get_endpoint(alts, 1)->bSynchAddress);
 457                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 458                         return 0;
 459                 return -EINVAL;
 460         }
 461         ep = get_endpoint(alts, 1)->bEndpointAddress;
 462         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 463             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 464             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 465              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 466                 dev_err(&dev->dev,
 467                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 468                            fmt->iface, fmt->altsetting,
 469                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 470                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 471                         return 0;
 472                 return -EINVAL;
 473         }
 474
 475         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 476                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 477
 478         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 479                                                    alts, ep, !subs->direction,
 480                                                    implicit_fb ?
 481                                                         SND_USB_ENDPOINT_TYPE_DATA :
 482                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 483         if (!subs->sync_endpoint) {
 484                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 485                         return 0;
 486                 return -EINVAL;
 487         }
 488
 489         subs->data_endpoint->sync_master = subs->sync_endpoint;
 490
 491         return 0;
 492 }
 493
 494 /*
 495  * find a matching format and set up the interface
 496  */
 497 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 498 {
 499         struct usb_device *dev = subs->dev;
 500         struct usb_host_interface *alts;
 501         struct usb_interface_descriptor *altsd;
 502         struct usb_interface *iface;
 503         int err;
 504
 505         iface = usb_ifnum_to_if(dev, fmt->iface);
 506         if (WARN_ON(!iface))
 507                 return -EINVAL;
 508         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 509         altsd = get_iface_desc(alts);
 510         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 511                 return -EINVAL;
 512
 513         if (fmt == subs->cur_audiofmt)
 514                 return 0;
 515
 516         /* close the old interface */
 517         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 518                 if (!subs->stream->chip->keep_iface) {
 519                         err = usb_set_interface(subs->dev, subs->interface, 0);
 520                         if (err < 0) {
 521                                 dev_err(&dev->dev,
 522                                         "%d:%d: return to setting 0 failed (%d)\n",
 523                                         fmt->iface, fmt->altsetting, err);
 524                                 return -EIO;
 525                         }
 526                 }
 527                 subs->interface = -1;
 528                 subs->altset_idx = 0;
 529         }
 530
 531         /* set interface */
 532         if (iface->cur_altsetting != alts) {
 533                 err = snd_usb_select_mode_quirk(subs, fmt);
 534                 if (err < 0)
 535                         return -EIO;
 536
 537                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 538                 if (err < 0) {
 539                         dev_err(&dev->dev,
 540                                 "%d:%d: usb_set_interface failed (%d)\n",
 541                                 fmt->iface, fmt->altsetting, err);
 542                         return -EIO;
 543                 }
 544                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 545                         fmt->iface, fmt->altsetting);
 546                 snd_usb_set_interface_quirk(dev);
 547         }
 548
 549         subs->interface = fmt->iface;
 550         subs->altset_idx = fmt->altset_idx;
 551         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 552                                                    alts, fmt->endpoint, subs->direction,
 553                                                    SND_USB_ENDPOINT_TYPE_DATA);
 554
 555         if (!subs->data_endpoint)
 556                 return -EINVAL;
 557
 558         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 559         if (err < 0)
 560                 return err;
 561
 562         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 563         if (err < 0)
 564                 return err;
 565
 566         subs->cur_audiofmt = fmt;
 567
 568         snd_usb_set_format_quirk(subs, fmt);
 569
 570         return 0;
 571 }
 572
 573 /*
 574  * Return the score of matching two audioformats.
 575  * Veto the audioformat if:
 576  * - It has no channels for some reason.
 577  * - Requested PCM format is not supported.
 578  * - Requested sample rate is not supported.
 579  */
 580 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 581                                        struct audioformat *fp,
 582                                        struct audioformat *match, int rate,
 583                                        snd_pcm_format_t pcm_format)
 584 {
 585         int i;
 586         int score = 0;
 587
 588         if (fp->channels < 1) {
 589                 dev_dbg(&subs->dev->dev,
 590                         "%s: (fmt @%p) no channels\n", __func__, fp);
 591                 return 0;
 592         }
 593
 594         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 595                 dev_dbg(&subs->dev->dev,
 596                         "%s: (fmt @%p) no match for format %d\n", __func__,
 597                         fp, pcm_format);
 598                 return 0;
 599         }
 600
 601         for (i = 0; i < fp->nr_rates; i++) {
 602                 if (fp->rate_table[i] == rate) {
 603                         score++;
 604                         break;
 605                 }
 606         }
 607         if (!score) {
 608                 dev_dbg(&subs->dev->dev,
 609                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 610                         fp, rate);
 611                 return 0;
 612         }
 613
 614         if (fp->channels == match->channels)
 615                 score++;
 616
 617         dev_dbg(&subs->dev->dev,
 618                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 619
 620         return score;
 621 }
 622
 623 /*
 624  * Configure the sync ep using the rate and pcm format of the data ep.
 625  */
 626 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 627 {
 628         int ret;
 629         struct audioformat *fp;
 630         struct audioformat *sync_fp = NULL;
 631         int cur_score = 0;
 632         int sync_period_bytes = subs->period_bytes;
 633         struct snd_usb_substream *sync_subs =
 634                 &subs->stream->substream[subs->direction ^ 1];
 635
 636         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 637             !subs->stream)
 638                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 639                                                    subs->pcm_format,
 640                                                    subs->channels,
 641                                                    subs->period_bytes,
 642                                                    0, 0,
 643                                                    subs->cur_rate,
 644                                                    subs->cur_audiofmt,
 645                                                    NULL);
 646
 647         /* Try to find the best matching audioformat. */
 648         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 649                 int score = match_endpoint_audioformats(subs,
 650                                                         fp, subs->cur_audiofmt,
 651                         subs->cur_rate, subs->pcm_format);
 652
 653                 if (score > cur_score) {
 654                         sync_fp = fp;
 655                         cur_score = score;
 656                 }
 657         }
 658
 659         if (unlikely(sync_fp == NULL)) {
 660                 dev_err(&subs->dev->dev,
 661                         "%s: no valid audioformat for sync ep %x found\n",
 662                         __func__, sync_subs->ep_num);
 663                 return -EINVAL;
 664         }
 665
 666         /*
 667          * Recalculate the period bytes if channel number differ between
 668          * data and sync ep audioformat.
 669          */
 670         if (sync_fp->channels != subs->channels) {
 671                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 672                         sync_fp->channels;
 673                 dev_dbg(&subs->dev->dev,
 674                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 675                         __func__, subs->period_bytes, sync_period_bytes);
 676         }
 677
 678         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 679                                           subs->pcm_format,
 680                                           sync_fp->channels,
 681                                           sync_period_bytes,
 682                                           0, 0,
 683                                           subs->cur_rate,
 684                                           sync_fp,
 685                                           NULL);
 686
 687         return ret;
 688 }
 689
 690 /*
 691  * configure endpoint params
 692  *
 693  * called  during initial setup and upon resume
 694  */
 695 static int configure_endpoint(struct snd_usb_substream *subs)
 696 {
 697         int ret;
 698
 699         /* format changed */
 700         stop_endpoints(subs, true);
 701         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 702                                           subs->pcm_format,
 703                                           subs->channels,
 704                                           subs->period_bytes,
 705                                           subs->period_frames,
 706                                           subs->buffer_periods,
 707                                           subs->cur_rate,
 708                                           subs->cur_audiofmt,
 709                                           subs->sync_endpoint);
 710         if (ret < 0)
 711                 return ret;
 712
 713         if (subs->sync_endpoint)
 714                 ret = configure_sync_endpoint(subs);
 715
 716         return ret;
 717 }
 718
 719 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 720 {
 721         int ret;
 722
 723         if (!subs->str_pd)
 724                 return 0;
 725
 726         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 727         if (ret < 0) {
 728                 dev_err(&subs->dev->dev,
 729                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 730                         subs->str_pd->pd_id, state, ret);
 731                 return ret;
 732         }
 733
 734         return 0;
 735 }
 736
 737 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 738 {
 739         int ret;
 740
 741         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 742         if (ret < 0)
 743                 return ret;
 744
 745         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 746         if (ret < 0)
 747                 return ret;
 748
 749         return 0;
 750 }
 751
 752 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 753 {
 754         int ret;
 755
 756         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 757         if (ret < 0)
 758                 return ret;
 759
 760         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 761         if (ret < 0)
 762                 return ret;
 763
 764         return 0;
 765 }
 766
 767 /*
 768  * hw_params callback
 769  *
 770  * allocate a buffer and set the given audio format.
 771  *
 772  * so far we use a physically linear buffer although packetize transfer
 773  * doesn't need a continuous area.
 774  * if sg buffer is supported on the later version of alsa, we'll follow
 775  * that.
 776  */
 777 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 778                              struct snd_pcm_hw_params *hw_params)
 779 {
 780         struct snd_usb_substream *subs = substream->runtime->private_data;
 781         struct audioformat *fmt;
 782         int ret;
 783
 784         ret = snd_media_start_pipeline(subs);
 785         if (ret)
 786                 return ret;
 787
 788         if (snd_usb_use_vmalloc)
 789                 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 790                                                        params_buffer_bytes(hw_params));
 791         else
 792                 ret = snd_pcm_lib_malloc_pages(substream,
 793                                                params_buffer_bytes(hw_params));
 794         if (ret < 0)
 795                 goto stop_pipeline;
 796
 797         subs->pcm_format = params_format(hw_params);
 798         subs->period_bytes = params_period_bytes(hw_params);
 799         subs->period_frames = params_period_size(hw_params);
 800         subs->buffer_periods = params_periods(hw_params);
 801         subs->channels = params_channels(hw_params);
 802         subs->cur_rate = params_rate(hw_params);
 803
 804         fmt = find_format(subs);
 805         if (!fmt) {
 806                 dev_dbg(&subs->dev->dev,
 807                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 808                            subs->pcm_format, subs->cur_rate, subs->channels);
 809                 ret = -EINVAL;
 810                 goto stop_pipeline;
 811         }
 812
 813         ret = snd_usb_lock_shutdown(subs->stream->chip);
 814         if (ret < 0)
 815                 goto stop_pipeline;
 816
 817         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 818         if (ret < 0)
 819                 goto unlock;
 820
 821         ret = set_format(subs, fmt);
 822         if (ret < 0)
 823                 goto unlock;
 824
 825         subs->interface = fmt->iface;
 826         subs->altset_idx = fmt->altset_idx;
 827         subs->need_setup_ep = true;
 828
 829  unlock:
 830         snd_usb_unlock_shutdown(subs->stream->chip);
 831         if (ret < 0)
 832                 goto stop_pipeline;
 833         return ret;
 834
 835  stop_pipeline:
 836         snd_media_stop_pipeline(subs);
 837         return ret;
 838 }
 839
 840 /*
 841  * hw_free callback
 842  *
 843  * reset the audio format and release the buffer
 844  */
 845 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 846 {
 847         struct snd_usb_substream *subs = substream->runtime->private_data;
 848
 849         snd_media_stop_pipeline(subs);
 850         subs->cur_audiofmt = NULL;
 851         subs->cur_rate = 0;
 852         subs->period_bytes = 0;
 853         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 854                 stop_endpoints(subs, true);
 855                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 856                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 857                 snd_usb_unlock_shutdown(subs->stream->chip);
 858         }
 859
 860         if (snd_usb_use_vmalloc)
 861                 return snd_pcm_lib_free_vmalloc_buffer(substream);
 862         else
 863                 return snd_pcm_lib_free_pages(substream);
 864 }
 865
 866 /*
 867  * prepare callback
 868  *
 869  * only a few subtle things...
 870  */
 871 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 872 {
 873         struct snd_pcm_runtime *runtime = substream->runtime;
 874         struct snd_usb_substream *subs = runtime->private_data;
 875         struct usb_host_interface *alts;
 876         struct usb_interface *iface;
 877         int ret;
 878
 879         if (! subs->cur_audiofmt) {
 880                 dev_err(&subs->dev->dev, "no format is specified!\n");
 881                 return -ENXIO;
 882         }
 883
 884         ret = snd_usb_lock_shutdown(subs->stream->chip);
 885         if (ret < 0)
 886                 return ret;
 887         if (snd_BUG_ON(!subs->data_endpoint)) {
 888                 ret = -EIO;
 889                 goto unlock;
 890         }
 891
 892         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 893         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 894
 895         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 896         if (ret < 0)
 897                 goto unlock;
 898
 899         ret = set_format(subs, subs->cur_audiofmt);
 900         if (ret < 0)
 901                 goto unlock;
 902
 903         if (subs->need_setup_ep) {
 904
 905                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 906                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 907                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 908                                                subs->cur_audiofmt->iface,
 909                                                alts,
 910                                                subs->cur_audiofmt,
 911                                                subs->cur_rate);
 912                 if (ret < 0)
 913                         goto unlock;
 914
 915                 ret = configure_endpoint(subs);
 916                 if (ret < 0)
 917                         goto unlock;
 918                 subs->need_setup_ep = false;
 919         }
 920
 921         /* some unit conversions in runtime */
 922         subs->data_endpoint->maxframesize =
 923                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 924         subs->data_endpoint->curframesize =
 925                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 926
 927         /* reset the pointer */
 928         subs->hwptr_done = 0;
 929         subs->transfer_done = 0;
 930         subs->last_delay = 0;
 931         subs->last_frame_number = 0;
 932         runtime->delay = 0;
 933
 934         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 935          * updates for all URBs would happen at the same time when starting */
 936         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 937                 ret = start_endpoints(subs);
 938
 939  unlock:
 940         snd_usb_unlock_shutdown(subs->stream->chip);
 941         return ret;
 942 }
 943
 944 static const struct snd_pcm_hardware snd_usb_hardware =
 945 {
 946         .info =                 SNDRV_PCM_INFO_MMAP |
 947                                 SNDRV_PCM_INFO_MMAP_VALID |
 948                                 SNDRV_PCM_INFO_BATCH |
 949                                 SNDRV_PCM_INFO_INTERLEAVED |
 950                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 951                                 SNDRV_PCM_INFO_PAUSE,
 952         .buffer_bytes_max =     1024 * 1024,
 953         .period_bytes_min =     64,
 954         .period_bytes_max =     512 * 1024,
 955         .periods_min =          2,
 956         .periods_max =          1024,
 957 };
 958
 959 static int hw_check_valid_format(struct snd_usb_substream *subs,
 960                                  struct snd_pcm_hw_params *params,
 961                                  struct audioformat *fp)
 962 {
 963         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 964         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 965         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 966         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 967         struct snd_mask check_fmts;
 968         unsigned int ptime;
 969
 970         /* check the format */
 971         snd_mask_none(&check_fmts);
 972         check_fmts.bits[0] = (u32)fp->formats;
 973         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 974         snd_mask_intersect(&check_fmts, fmts);
 975         if (snd_mask_empty(&check_fmts)) {
 976                 hwc_debug("   > check: no supported format %d\n", fp->format);
 977                 return 0;
 978         }
 979         /* check the channels */
 980         if (fp->channels < ct->min || fp->channels > ct->max) {
 981                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 982                 return 0;
 983         }
 984         /* check the rate is within the range */
 985         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 986                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 987                 return 0;
 988         }
 989         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 990                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 991                 return 0;
 992         }
 993         /* check whether the period time is >= the data packet interval */
 994         if (subs->speed != USB_SPEED_FULL) {
 995                 ptime = 125 * (1 << fp->datainterval);
 996                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 997                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 998                         return 0;
 999                 }
1000         }
1001         return 1;
1002 }
1003
1004 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1005                         struct snd_pcm_hw_rule *rule)
1006 {
1007         struct snd_usb_substream *subs = rule->private;
1008         struct audioformat *fp;
1009         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1010         unsigned int rmin, rmax;
1011         int changed;
1012
1013         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1014         changed = 0;
1015         rmin = rmax = 0;
1016         list_for_each_entry(fp, &subs->fmt_list, list) {
1017                 if (!hw_check_valid_format(subs, params, fp))
1018                         continue;
1019                 if (changed++) {
1020                         if (rmin > fp->rate_min)
1021                                 rmin = fp->rate_min;
1022                         if (rmax < fp->rate_max)
1023                                 rmax = fp->rate_max;
1024                 } else {
1025                         rmin = fp->rate_min;
1026                         rmax = fp->rate_max;
1027                 }
1028         }
1029
1030         if (!changed) {
1031                 hwc_debug("  --> get empty\n");
1032                 it->empty = 1;
1033                 return -EINVAL;
1034         }
1035
1036         changed = 0;
1037         if (it->min < rmin) {
1038                 it->min = rmin;
1039                 it->openmin = 0;
1040                 changed = 1;
1041         }
1042         if (it->max > rmax) {
1043                 it->max = rmax;
1044                 it->openmax = 0;
1045                 changed = 1;
1046         }
1047         if (snd_interval_checkempty(it)) {
1048                 it->empty = 1;
1049                 return -EINVAL;
1050         }
1051         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1052         return changed;
1053 }
1054
1055
1056 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1057                             struct snd_pcm_hw_rule *rule)
1058 {
1059         struct snd_usb_substream *subs = rule->private;
1060         struct audioformat *fp;
1061         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1062         unsigned int rmin, rmax;
1063         int changed;
1064
1065         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1066         changed = 0;
1067         rmin = rmax = 0;
1068         list_for_each_entry(fp, &subs->fmt_list, list) {
1069                 if (!hw_check_valid_format(subs, params, fp))
1070                         continue;
1071                 if (changed++) {
1072                         if (rmin > fp->channels)
1073                                 rmin = fp->channels;
1074                         if (rmax < fp->channels)
1075                                 rmax = fp->channels;
1076                 } else {
1077                         rmin = fp->channels;
1078                         rmax = fp->channels;
1079                 }
1080         }
1081
1082         if (!changed) {
1083                 hwc_debug("  --> get empty\n");
1084                 it->empty = 1;
1085                 return -EINVAL;
1086         }
1087
1088         changed = 0;
1089         if (it->min < rmin) {
1090                 it->min = rmin;
1091                 it->openmin = 0;
1092                 changed = 1;
1093         }
1094         if (it->max > rmax) {
1095                 it->max = rmax;
1096                 it->openmax = 0;
1097                 changed = 1;
1098         }
1099         if (snd_interval_checkempty(it)) {
1100                 it->empty = 1;
1101                 return -EINVAL;
1102         }
1103         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1104         return changed;
1105 }
1106
1107 static int hw_rule_format(struct snd_pcm_hw_params *params,
1108                           struct snd_pcm_hw_rule *rule)
1109 {
1110         struct snd_usb_substream *subs = rule->private;
1111         struct audioformat *fp;
1112         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1113         u64 fbits;
1114         u32 oldbits[2];
1115         int changed;
1116
1117         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1118         fbits = 0;
1119         list_for_each_entry(fp, &subs->fmt_list, list) {
1120                 if (!hw_check_valid_format(subs, params, fp))
1121                         continue;
1122                 fbits |= fp->formats;
1123         }
1124
1125         oldbits[0] = fmt->bits[0];
1126         oldbits[1] = fmt->bits[1];
1127         fmt->bits[0] &= (u32)fbits;
1128         fmt->bits[1] &= (u32)(fbits >> 32);
1129         if (!fmt->bits[0] && !fmt->bits[1]) {
1130                 hwc_debug("  --> get empty\n");
1131                 return -EINVAL;
1132         }
1133         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1134         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1135         return changed;
1136 }
1137
1138 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1139                                struct snd_pcm_hw_rule *rule)
1140 {
1141         struct snd_usb_substream *subs = rule->private;
1142         struct audioformat *fp;
1143         struct snd_interval *it;
1144         unsigned char min_datainterval;
1145         unsigned int pmin;
1146         int changed;
1147
1148         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1149         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1150         min_datainterval = 0xff;
1151         list_for_each_entry(fp, &subs->fmt_list, list) {
1152                 if (!hw_check_valid_format(subs, params, fp))
1153                         continue;
1154                 min_datainterval = min(min_datainterval, fp->datainterval);
1155         }
1156         if (min_datainterval == 0xff) {
1157                 hwc_debug("  --> get empty\n");
1158                 it->empty = 1;
1159                 return -EINVAL;
1160         }
1161         pmin = 125 * (1 << min_datainterval);
1162         changed = 0;
1163         if (it->min < pmin) {
1164                 it->min = pmin;
1165                 it->openmin = 0;
1166                 changed = 1;
1167         }
1168         if (snd_interval_checkempty(it)) {
1169                 it->empty = 1;
1170                 return -EINVAL;
1171         }
1172         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1173         return changed;
1174 }
1175
1176 /*
1177  *  If the device supports unusual bit rates, does the request meet these?
1178  */
1179 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1180                                   struct snd_usb_substream *subs)
1181 {
1182         struct audioformat *fp;
1183         int *rate_list;
1184         int count = 0, needs_knot = 0;
1185         int err;
1186
1187         kfree(subs->rate_list.list);
1188         subs->rate_list.list = NULL;
1189
1190         list_for_each_entry(fp, &subs->fmt_list, list) {
1191                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1192                         return 0;
1193                 count += fp->nr_rates;
1194                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1195                         needs_knot = 1;
1196         }
1197         if (!needs_knot)
1198                 return 0;
1199
1200         subs->rate_list.list = rate_list =
1201                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1202         if (!subs->rate_list.list)
1203                 return -ENOMEM;
1204         subs->rate_list.count = count;
1205         subs->rate_list.mask = 0;
1206         count = 0;
1207         list_for_each_entry(fp, &subs->fmt_list, list) {
1208                 int i;
1209                 for (i = 0; i < fp->nr_rates; i++)
1210                         rate_list[count++] = fp->rate_table[i];
1211         }
1212         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1213                                          &subs->rate_list);
1214         if (err < 0)
1215                 return err;
1216
1217         return 0;
1218 }
1219
1220
1221 /*
1222  * set up the runtime hardware information.
1223  */
1224
1225 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1226 {
1227         struct audioformat *fp;
1228         unsigned int pt, ptmin;
1229         int param_period_time_if_needed;
1230         int err;
1231
1232         runtime->hw.formats = subs->formats;
1233
1234         runtime->hw.rate_min = 0x7fffffff;
1235         runtime->hw.rate_max = 0;
1236         runtime->hw.channels_min = 256;
1237         runtime->hw.channels_max = 0;
1238         runtime->hw.rates = 0;
1239         ptmin = UINT_MAX;
1240         /* check min/max rates and channels */
1241         list_for_each_entry(fp, &subs->fmt_list, list) {
1242                 runtime->hw.rates |= fp->rates;
1243                 if (runtime->hw.rate_min > fp->rate_min)
1244                         runtime->hw.rate_min = fp->rate_min;
1245                 if (runtime->hw.rate_max < fp->rate_max)
1246                         runtime->hw.rate_max = fp->rate_max;
1247                 if (runtime->hw.channels_min > fp->channels)
1248                         runtime->hw.channels_min = fp->channels;
1249                 if (runtime->hw.channels_max < fp->channels)
1250                         runtime->hw.channels_max = fp->channels;
1251                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1252                         /* FIXME: there might be more than one audio formats... */
1253                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1254                                 fp->frame_size;
1255                 }
1256                 pt = 125 * (1 << fp->datainterval);
1257                 ptmin = min(ptmin, pt);
1258         }
1259
1260         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1261         if (subs->speed == USB_SPEED_FULL)
1262                 /* full speed devices have fixed data packet interval */
1263                 ptmin = 1000;
1264         if (ptmin == 1000)
1265                 /* if period time doesn't go below 1 ms, no rules needed */
1266                 param_period_time_if_needed = -1;
1267
1268         err = snd_pcm_hw_constraint_minmax(runtime,
1269                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1270                                            ptmin, UINT_MAX);
1271         if (err < 0)
1272                 return err;
1273
1274         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1275                                   hw_rule_rate, subs,
1276                                   SNDRV_PCM_HW_PARAM_FORMAT,
1277                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1278                                   param_period_time_if_needed,
1279                                   -1);
1280         if (err < 0)
1281                 return err;
1282         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1283                                   hw_rule_channels, subs,
1284                                   SNDRV_PCM_HW_PARAM_FORMAT,
1285                                   SNDRV_PCM_HW_PARAM_RATE,
1286                                   param_period_time_if_needed,
1287                                   -1);
1288         if (err < 0)
1289                 return err;
1290         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1291                                   hw_rule_format, subs,
1292                                   SNDRV_PCM_HW_PARAM_RATE,
1293                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1294                                   param_period_time_if_needed,
1295                                   -1);
1296         if (err < 0)
1297                 return err;
1298         if (param_period_time_if_needed >= 0) {
1299                 err = snd_pcm_hw_rule_add(runtime, 0,
1300                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1301                                           hw_rule_period_time, subs,
1302                                           SNDRV_PCM_HW_PARAM_FORMAT,
1303                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1304                                           SNDRV_PCM_HW_PARAM_RATE,
1305                                           -1);
1306                 if (err < 0)
1307                         return err;
1308         }
1309         err = snd_usb_pcm_check_knot(runtime, subs);
1310         if (err < 0)
1311                 return err;
1312
1313         return snd_usb_autoresume(subs->stream->chip);
1314 }
1315
1316 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1317 {
1318         int direction = substream->stream;
1319         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1320         struct snd_pcm_runtime *runtime = substream->runtime;
1321         struct snd_usb_substream *subs = &as->substream[direction];
1322         int ret;
1323
1324         subs->interface = -1;
1325         subs->altset_idx = 0;
1326         runtime->hw = snd_usb_hardware;
1327         runtime->private_data = subs;
1328         subs->pcm_substream = substream;
1329         /* runtime PM is also done there */
1330
1331         /* initialize DSD/DOP context */
1332         subs->dsd_dop.byte_idx = 0;
1333         subs->dsd_dop.channel = 0;
1334         subs->dsd_dop.marker = 1;
1335
1336         ret = setup_hw_info(runtime, subs);
1337         if (ret == 0) {
1338                 ret = snd_media_stream_init(subs, as->pcm, direction);
1339                 if (ret)
1340                         snd_usb_autosuspend(subs->stream->chip);
1341         }
1342         return ret;
1343 }
1344
1345 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1346 {
1347         int direction = substream->stream;
1348         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1349         struct snd_usb_substream *subs = &as->substream[direction];
1350         int ret;
1351
1352         stop_endpoints(subs, true);
1353         snd_media_stop_pipeline(subs);
1354
1355         if (!as->chip->keep_iface &&
1356             subs->interface >= 0 &&
1357             !snd_usb_lock_shutdown(subs->stream->chip)) {
1358                 usb_set_interface(subs->dev, subs->interface, 0);
1359                 subs->interface = -1;
1360                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1361                 snd_usb_unlock_shutdown(subs->stream->chip);
1362                 if (ret < 0)
1363                         return ret;
1364         }
1365
1366         subs->pcm_substream = NULL;
1367         snd_usb_autosuspend(subs->stream->chip);
1368
1369         return 0;
1370 }
1371
1372 /* Since a URB can handle only a single linear buffer, we must use double
1373  * buffering when the data to be transferred overflows the buffer boundary.
1374  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1375  * for all URBs.
1376  */
1377 static void retire_capture_urb(struct snd_usb_substream *subs,
1378                                struct urb *urb)
1379 {
1380         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1381         unsigned int stride, frames, bytes, oldptr;
1382         int i, period_elapsed = 0;
1383         unsigned long flags;
1384         unsigned char *cp;
1385         int current_frame_number;
1386
1387         /* read frame number here, update pointer in critical section */
1388         current_frame_number = usb_get_current_frame_number(subs->dev);
1389
1390         stride = runtime->frame_bits >> 3;
1391
1392         for (i = 0; i < urb->number_of_packets; i++) {
1393                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1394                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1395                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1396                                 i, urb->iso_frame_desc[i].status);
1397                         // continue;
1398                 }
1399                 bytes = urb->iso_frame_desc[i].actual_length;
1400                 frames = bytes / stride;
1401                 if (!subs->txfr_quirk)
1402                         bytes = frames * stride;
1403                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1404                         int oldbytes = bytes;
1405                         bytes = frames * stride;
1406                         dev_warn_ratelimited(&subs->dev->dev,
1407                                  "Corrected urb data len. %d->%d\n",
1408                                                         oldbytes, bytes);
1409                 }
1410                 /* update the current pointer */
1411                 spin_lock_irqsave(&subs->lock, flags);
1412                 oldptr = subs->hwptr_done;
1413                 subs->hwptr_done += bytes;
1414                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1415                         subs->hwptr_done -= runtime->buffer_size * stride;
1416                 frames = (bytes + (oldptr % stride)) / stride;
1417                 subs->transfer_done += frames;
1418                 if (subs->transfer_done >= runtime->period_size) {
1419                         subs->transfer_done -= runtime->period_size;
1420                         period_elapsed = 1;
1421                 }
1422                 /* capture delay is by construction limited to one URB,
1423                  * reset delays here
1424                  */
1425                 runtime->delay = subs->last_delay = 0;
1426
1427                 /* realign last_frame_number */
1428                 subs->last_frame_number = current_frame_number;
1429                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1430
1431                 spin_unlock_irqrestore(&subs->lock, flags);
1432                 /* copy a data chunk */
1433                 if (oldptr + bytes > runtime->buffer_size * stride) {
1434                         unsigned int bytes1 =
1435                                         runtime->buffer_size * stride - oldptr;
1436                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1437                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1438                 } else {
1439                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1440                 }
1441         }
1442
1443         if (period_elapsed)
1444                 snd_pcm_period_elapsed(subs->pcm_substream);
1445 }
1446
1447 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1448                                              struct urb *urb, unsigned int bytes)
1449 {
1450         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1451         unsigned int stride = runtime->frame_bits >> 3;
1452         unsigned int dst_idx = 0;
1453         unsigned int src_idx = subs->hwptr_done;
1454         unsigned int wrap = runtime->buffer_size * stride;
1455         u8 *dst = urb->transfer_buffer;
1456         u8 *src = runtime->dma_area;
1457         u8 marker[] = { 0x05, 0xfa };
1458
1459         /*
1460          * The DSP DOP format defines a way to transport DSD samples over
1461          * normal PCM data endpoints. It requires stuffing of marker bytes
1462          * (0x05 and 0xfa, alternating per sample frame), and then expects
1463          * 2 additional bytes of actual payload. The whole frame is stored
1464          * LSB.
1465          *
1466          * Hence, for a stereo transport, the buffer layout looks like this,
1467          * where L refers to left channel samples and R to right.
1468          *
1469          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1470          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1471          *   .....
1472          *
1473          */
1474
1475         while (bytes--) {
1476                 if (++subs->dsd_dop.byte_idx == 3) {
1477                         /* frame boundary? */
1478                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1479                         src_idx += 2;
1480                         subs->dsd_dop.byte_idx = 0;
1481
1482                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1483                                 /* alternate the marker */
1484                                 subs->dsd_dop.marker++;
1485                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1486                                 subs->dsd_dop.channel = 0;
1487                         }
1488                 } else {
1489                         /* stuff the DSD payload */
1490                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1491
1492                         if (subs->cur_audiofmt->dsd_bitrev)
1493                                 dst[dst_idx++] = bitrev8(src[idx]);
1494                         else
1495                                 dst[dst_idx++] = src[idx];
1496
1497                         subs->hwptr_done++;
1498                 }
1499         }
1500         if (subs->hwptr_done >= runtime->buffer_size * stride)
1501                 subs->hwptr_done -= runtime->buffer_size * stride;
1502 }
1503
1504 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1505                         int offset, int stride, unsigned int bytes)
1506 {
1507         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1508
1509         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1510                 /* err, the transferred area goes over buffer boundary. */
1511                 unsigned int bytes1 =
1512                         runtime->buffer_size * stride - subs->hwptr_done;
1513                 memcpy(urb->transfer_buffer + offset,
1514                        runtime->dma_area + subs->hwptr_done, bytes1);
1515                 memcpy(urb->transfer_buffer + offset + bytes1,
1516                        runtime->dma_area, bytes - bytes1);
1517         } else {
1518                 memcpy(urb->transfer_buffer + offset,
1519                        runtime->dma_area + subs->hwptr_done, bytes);
1520         }
1521         subs->hwptr_done += bytes;
1522         if (subs->hwptr_done >= runtime->buffer_size * stride)
1523                 subs->hwptr_done -= runtime->buffer_size * stride;
1524 }
1525
1526 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1527                                       struct urb *urb, int stride,
1528                                       unsigned int bytes)
1529 {
1530         __le32 packet_length;
1531         int i;
1532
1533         /* Put __le32 length descriptor at start of each packet. */
1534         for (i = 0; i < urb->number_of_packets; i++) {
1535                 unsigned int length = urb->iso_frame_desc[i].length;
1536                 unsigned int offset = urb->iso_frame_desc[i].offset;
1537
1538                 packet_length = cpu_to_le32(length);
1539                 offset += i * sizeof(packet_length);
1540                 urb->iso_frame_desc[i].offset = offset;
1541                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1542                 memcpy(urb->transfer_buffer + offset,
1543                        &packet_length, sizeof(packet_length));
1544                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1545                             stride, length);
1546         }
1547         /* Adjust transfer size accordingly. */
1548         bytes += urb->number_of_packets * sizeof(packet_length);
1549         return bytes;
1550 }
1551
1552 static void prepare_playback_urb(struct snd_usb_substream *subs,
1553                                  struct urb *urb)
1554 {
1555         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1556         struct snd_usb_endpoint *ep = subs->data_endpoint;
1557         struct snd_urb_ctx *ctx = urb->context;
1558         unsigned int counts, frames, bytes;
1559         int i, stride, period_elapsed = 0;
1560         unsigned long flags;
1561
1562         stride = runtime->frame_bits >> 3;
1563
1564         frames = 0;
1565         urb->number_of_packets = 0;
1566         spin_lock_irqsave(&subs->lock, flags);
1567         subs->frame_limit += ep->max_urb_frames;
1568         for (i = 0; i < ctx->packets; i++) {
1569                 if (ctx->packet_size[i])
1570                         counts = ctx->packet_size[i];
1571                 else
1572                         counts = snd_usb_endpoint_next_packet_size(ep);
1573
1574                 /* set up descriptor */
1575                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1576                 urb->iso_frame_desc[i].length = counts * ep->stride;
1577                 frames += counts;
1578                 urb->number_of_packets++;
1579                 subs->transfer_done += counts;
1580                 if (subs->transfer_done >= runtime->period_size) {
1581                         subs->transfer_done -= runtime->period_size;
1582                         subs->frame_limit = 0;
1583                         period_elapsed = 1;
1584                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1585                                 if (subs->transfer_done > 0) {
1586                                         /* FIXME: fill-max mode is not
1587                                          * supported yet */
1588                                         frames -= subs->transfer_done;
1589                                         counts -= subs->transfer_done;
1590                                         urb->iso_frame_desc[i].length =
1591                                                 counts * ep->stride;
1592                                         subs->transfer_done = 0;
1593                                 }
1594                                 i++;
1595                                 if (i < ctx->packets) {
1596                                         /* add a transfer delimiter */
1597                                         urb->iso_frame_desc[i].offset =
1598                                                 frames * ep->stride;
1599                                         urb->iso_frame_desc[i].length = 0;
1600                                         urb->number_of_packets++;
1601                                 }
1602                                 break;
1603                         }
1604                 }
1605                 /* finish at the period boundary or after enough frames */
1606                 if ((period_elapsed ||
1607                                 subs->transfer_done >= subs->frame_limit) &&
1608                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1609                         break;
1610         }
1611         bytes = frames * ep->stride;
1612
1613         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1614                      subs->cur_audiofmt->dsd_dop)) {
1615                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1616         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1617                            subs->cur_audiofmt->dsd_bitrev)) {
1618                 /* bit-reverse the bytes */
1619                 u8 *buf = urb->transfer_buffer;
1620                 for (i = 0; i < bytes; i++) {
1621                         int idx = (subs->hwptr_done + i)
1622                                 % (runtime->buffer_size * stride);
1623                         buf[i] = bitrev8(runtime->dma_area[idx]);
1624                 }
1625
1626                 subs->hwptr_done += bytes;
1627                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1628                         subs->hwptr_done -= runtime->buffer_size * stride;
1629         } else {
1630                 /* usual PCM */
1631                 if (!subs->tx_length_quirk)
1632                         copy_to_urb(subs, urb, 0, stride, bytes);
1633                 else
1634                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1635                         /* bytes is now amount of outgoing data */
1636         }
1637
1638         /* update delay with exact number of samples queued */
1639         runtime->delay = subs->last_delay;
1640         runtime->delay += frames;
1641         subs->last_delay = runtime->delay;
1642
1643         /* realign last_frame_number */
1644         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1645         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1646
1647         if (subs->trigger_tstamp_pending_update) {
1648                 /* this is the first actual URB submitted,
1649                  * update trigger timestamp to reflect actual start time
1650                  */
1651                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1652                 subs->trigger_tstamp_pending_update = false;
1653         }
1654
1655         spin_unlock_irqrestore(&subs->lock, flags);
1656         urb->transfer_buffer_length = bytes;
1657         if (period_elapsed)
1658                 snd_pcm_period_elapsed(subs->pcm_substream);
1659 }
1660
1661 /*
1662  * process after playback data complete
1663  * - decrease the delay count again
1664  */
1665 static void retire_playback_urb(struct snd_usb_substream *subs,
1666                                struct urb *urb)
1667 {
1668         unsigned long flags;
1669         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1670         struct snd_usb_endpoint *ep = subs->data_endpoint;
1671         int processed = urb->transfer_buffer_length / ep->stride;
1672         int est_delay;
1673
1674         /* ignore the delay accounting when procssed=0 is given, i.e.
1675          * silent payloads are procssed before handling the actual data
1676          */
1677         if (!processed)
1678                 return;
1679
1680         spin_lock_irqsave(&subs->lock, flags);
1681         if (!subs->last_delay)
1682                 goto out; /* short path */
1683
1684         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1685         /* update delay with exact number of samples played */
1686         if (processed > subs->last_delay)
1687                 subs->last_delay = 0;
1688         else
1689                 subs->last_delay -= processed;
1690         runtime->delay = subs->last_delay;
1691
1692         /*
1693          * Report when delay estimate is off by more than 2ms.
1694          * The error should be lower than 2ms since the estimate relies
1695          * on two reads of a counter updated every ms.
1696          */
1697         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1698                 dev_dbg_ratelimited(&subs->dev->dev,
1699                         "delay: estimated %d, actual %d\n",
1700                         est_delay, subs->last_delay);
1701
1702         if (!subs->running) {
1703                 /* update last_frame_number for delay counting here since
1704                  * prepare_playback_urb won't be called during pause
1705                  */
1706                 subs->last_frame_number =
1707                         usb_get_current_frame_number(subs->dev) & 0xff;
1708         }
1709
1710  out:
1711         spin_unlock_irqrestore(&subs->lock, flags);
1712 }
1713
1714 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1715                                               int cmd)
1716 {
1717         struct snd_usb_substream *subs = substream->runtime->private_data;
1718
1719         switch (cmd) {
1720         case SNDRV_PCM_TRIGGER_START:
1721                 subs->trigger_tstamp_pending_update = true;
1722                 /* fall through */
1723         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1724                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1725                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1726                 subs->running = 1;
1727                 return 0;
1728         case SNDRV_PCM_TRIGGER_STOP:
1729                 stop_endpoints(subs, false);
1730                 subs->running = 0;
1731                 return 0;
1732         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1733                 subs->data_endpoint->prepare_data_urb = NULL;
1734                 /* keep retire_data_urb for delay calculation */
1735                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1736                 subs->running = 0;
1737                 return 0;
1738         }
1739
1740         return -EINVAL;
1741 }
1742
1743 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1744                                              int cmd)
1745 {
1746         int err;
1747         struct snd_usb_substream *subs = substream->runtime->private_data;
1748
1749         switch (cmd) {
1750         case SNDRV_PCM_TRIGGER_START:
1751                 err = start_endpoints(subs);
1752                 if (err < 0)
1753                         return err;
1754
1755                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1756                 subs->running = 1;
1757                 return 0;
1758         case SNDRV_PCM_TRIGGER_STOP:
1759                 stop_endpoints(subs, false);
1760                 subs->running = 0;
1761                 return 0;
1762         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1763                 subs->data_endpoint->retire_data_urb = NULL;
1764                 subs->running = 0;
1765                 return 0;
1766         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1767                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1768                 subs->running = 1;
1769                 return 0;
1770         }
1771
1772         return -EINVAL;
1773 }
1774
1775 static const struct snd_pcm_ops snd_usb_playback_ops = {
1776         .open =         snd_usb_pcm_open,
1777         .close =        snd_usb_pcm_close,
1778         .ioctl =        snd_pcm_lib_ioctl,
1779         .hw_params =    snd_usb_hw_params,
1780         .hw_free =      snd_usb_hw_free,
1781         .prepare =      snd_usb_pcm_prepare,
1782         .trigger =      snd_usb_substream_playback_trigger,
1783         .pointer =      snd_usb_pcm_pointer,
1784         .page =         snd_pcm_lib_get_vmalloc_page,
1785 };
1786
1787 static const struct snd_pcm_ops snd_usb_capture_ops = {
1788         .open =         snd_usb_pcm_open,
1789         .close =        snd_usb_pcm_close,
1790         .ioctl =        snd_pcm_lib_ioctl,
1791         .hw_params =    snd_usb_hw_params,
1792         .hw_free =      snd_usb_hw_free,
1793         .prepare =      snd_usb_pcm_prepare,
1794         .trigger =      snd_usb_substream_capture_trigger,
1795         .pointer =      snd_usb_pcm_pointer,
1796         .page =         snd_pcm_lib_get_vmalloc_page,
1797 };
1798
1799 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1800         .open =         snd_usb_pcm_open,
1801         .close =        snd_usb_pcm_close,
1802         .ioctl =        snd_pcm_lib_ioctl,
1803         .hw_params =    snd_usb_hw_params,
1804         .hw_free =      snd_usb_hw_free,
1805         .prepare =      snd_usb_pcm_prepare,
1806         .trigger =      snd_usb_substream_playback_trigger,
1807         .pointer =      snd_usb_pcm_pointer,
1808         .page =         snd_pcm_sgbuf_ops_page,
1809 };
1810
1811 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1812         .open =         snd_usb_pcm_open,
1813         .close =        snd_usb_pcm_close,
1814         .ioctl =        snd_pcm_lib_ioctl,
1815         .hw_params =    snd_usb_hw_params,
1816         .hw_free =      snd_usb_hw_free,
1817         .prepare =      snd_usb_pcm_prepare,
1818         .trigger =      snd_usb_substream_capture_trigger,
1819         .pointer =      snd_usb_pcm_pointer,
1820         .page =         snd_pcm_sgbuf_ops_page,
1821 };
1822
1823 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1824 {
1825         const struct snd_pcm_ops *ops;
1826
1827         if (snd_usb_use_vmalloc)
1828                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1829                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1830         else
1831                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1832                         &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1833         snd_pcm_set_ops(pcm, stream, ops);
1834 }
1835
1836 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1837 {
1838         struct snd_pcm *pcm = subs->stream->pcm;
1839         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1840         struct device *dev = subs->dev->bus->controller;
1841
1842         if (!snd_usb_use_vmalloc)
1843                 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1844                                               dev, 64*1024, 512*1024);
1845 }