sound/usb/pcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/bitrev.h>
  20 #include <linux/ratelimit.h>
  21 #include <linux/usb.h>
  22 #include <linux/usb/audio.h>
  23 #include <linux/usb/audio-v2.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28
  29 #include "usbaudio.h"
  30 #include "card.h"
  31 #include "quirks.h"
  32 #include "debug.h"
  33 #include "endpoint.h"
  34 #include "helper.h"
  35 #include "pcm.h"
  36 #include "clock.h"
  37 #include "power.h"
  38
  39 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  40 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  41
  42 /* return the estimated delay based on USB frame counters */
  43 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  44                                     unsigned int rate)
  45 {
  46         int current_frame_number;
  47         int frame_diff;
  48         int est_delay;
  49
  50         if (!subs->last_delay)
  51                 return 0; /* short path */
  52
  53         current_frame_number = usb_get_current_frame_number(subs->dev);
  54         /*
  55          * HCD implementations use different widths, use lower 8 bits.
  56          * The delay will be managed up to 256ms, which is more than
  57          * enough
  58          */
  59         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  60
  61         /* Approximation based on number of samples per USB frame (ms),
  62            some truncation for 44.1 but the estimate is good enough */
  63         est_delay =  frame_diff * rate / 1000;
  64         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  65                 est_delay = subs->last_delay - est_delay;
  66         else
  67                 est_delay = subs->last_delay + est_delay;
  68
  69         if (est_delay < 0)
  70                 est_delay = 0;
  71         return est_delay;
  72 }
  73
  74 /*
  75  * return the current pcm pointer.  just based on the hwptr_done value.
  76  */
  77 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  78 {
  79         struct snd_usb_substream *subs = substream->runtime->private_data;
  80         unsigned int hwptr_done;
  81
  82         if (atomic_read(&subs->stream->chip->shutdown))
  83                 return SNDRV_PCM_POS_XRUN;
  84         spin_lock(&subs->lock);
  85         hwptr_done = subs->hwptr_done;
  86         substream->runtime->delay = snd_usb_pcm_delay(subs,
  87                                                 substream->runtime->rate);
  88         spin_unlock(&subs->lock);
  89         return hwptr_done / (substream->runtime->frame_bits >> 3);
  90 }
  91
  92 /*
  93  * find a matching audio format
  94  */
  95 static struct audioformat *find_format(struct snd_usb_substream *subs)
  96 {
  97         struct audioformat *fp;
  98         struct audioformat *found = NULL;
  99         int cur_attr = 0, attr;
 100
 101         list_for_each_entry(fp, &subs->fmt_list, list) {
 102                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
 103                         continue;
 104                 if (fp->channels != subs->channels)
 105                         continue;
 106                 if (subs->cur_rate < fp->rate_min ||
 107                     subs->cur_rate > fp->rate_max)
 108                         continue;
 109                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 110                         unsigned int i;
 111                         for (i = 0; i < fp->nr_rates; i++)
 112                                 if (fp->rate_table[i] == subs->cur_rate)
 113                                         break;
 114                         if (i >= fp->nr_rates)
 115                                 continue;
 116                 }
 117                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 118                 if (! found) {
 119                         found = fp;
 120                         cur_attr = attr;
 121                         continue;
 122                 }
 123                 /* avoid async out and adaptive in if the other method
 124                  * supports the same format.
 125                  * this is a workaround for the case like
 126                  * M-audio audiophile USB.
 127                  */
 128                 if (attr != cur_attr) {
 129                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 130                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 131                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 132                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 133                                 continue;
 134                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 135                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 136                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 137                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 138                                 found = fp;
 139                                 cur_attr = attr;
 140                                 continue;
 141                         }
 142                 }
 143                 /* find the format with the largest max. packet size */
 144                 if (fp->maxpacksize > found->maxpacksize) {
 145                         found = fp;
 146                         cur_attr = attr;
 147                 }
 148         }
 149         return found;
 150 }
 151
 152 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 153                          struct usb_host_interface *alts,
 154                          struct audioformat *fmt)
 155 {
 156         struct usb_device *dev = chip->dev;
 157         unsigned int ep;
 158         unsigned char data[1];
 159         int err;
 160
 161         if (get_iface_desc(alts)->bNumEndpoints < 1)
 162                 return -EINVAL;
 163         ep = get_endpoint(alts, 0)->bEndpointAddress;
 164
 165         data[0] = 1;
 166         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 167                               USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 168                               UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 169                               data, sizeof(data));
 170         if (err < 0) {
 171                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 172                               iface, ep);
 173                 return err;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 180                          struct usb_host_interface *alts,
 181                          struct audioformat *fmt)
 182 {
 183         struct usb_device *dev = chip->dev;
 184         unsigned char data[1];
 185         int err;
 186
 187         data[0] = 1;
 188         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 189                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 190                               UAC2_EP_CS_PITCH << 8, 0,
 191                               data, sizeof(data));
 192         if (err < 0) {
 193                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 194                               iface, fmt->altsetting);
 195                 return err;
 196         }
 197
 198         return 0;
 199 }
 200
 201 /*
 202  * initialize the pitch control and sample rate
 203  */
 204 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 205                        struct usb_host_interface *alts,
 206                        struct audioformat *fmt)
 207 {
 208         /* if endpoint doesn't have pitch control, bail out */
 209         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 210                 return 0;
 211
 212         switch (fmt->protocol) {
 213         case UAC_VERSION_1:
 214         default:
 215                 return init_pitch_v1(chip, iface, alts, fmt);
 216
 217         case UAC_VERSION_2:
 218                 return init_pitch_v2(chip, iface, alts, fmt);
 219         }
 220 }
 221
 222 static int start_endpoints(struct snd_usb_substream *subs)
 223 {
 224         int err;
 225
 226         if (!subs->data_endpoint)
 227                 return -EINVAL;
 228
 229         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 230                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 231
 232                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 233
 234                 ep->data_subs = subs;
 235                 err = snd_usb_endpoint_start(ep);
 236                 if (err < 0) {
 237                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 238                         return err;
 239                 }
 240         }
 241
 242         if (subs->sync_endpoint &&
 243             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 244                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 245
 246                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 247                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 248                         err = usb_set_interface(subs->dev,
 249                                                 subs->sync_endpoint->iface,
 250                                                 subs->sync_endpoint->altsetting);
 251                         if (err < 0) {
 252                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 253                                 dev_err(&subs->dev->dev,
 254                                            "%d:%d: cannot set interface (%d)\n",
 255                                            subs->sync_endpoint->iface,
 256                                            subs->sync_endpoint->altsetting, err);
 257                                 return -EIO;
 258                         }
 259                 }
 260
 261                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 262
 263                 ep->sync_slave = subs->data_endpoint;
 264                 err = snd_usb_endpoint_start(ep);
 265                 if (err < 0) {
 266                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 267                         return err;
 268                 }
 269         }
 270
 271         return 0;
 272 }
 273
 274 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 275 {
 276         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 277                 snd_usb_endpoint_stop(subs->sync_endpoint);
 278
 279         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 280                 snd_usb_endpoint_stop(subs->data_endpoint);
 281
 282         if (wait) {
 283                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 284                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 285         }
 286 }
 287
 288 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 289                                      unsigned int altsetting,
 290                                      struct usb_host_interface **alts,
 291                                      unsigned int *ep)
 292 {
 293         struct usb_interface *iface;
 294         struct usb_interface_descriptor *altsd;
 295         struct usb_endpoint_descriptor *epd;
 296
 297         iface = usb_ifnum_to_if(dev, ifnum);
 298         if (!iface || iface->num_altsetting < altsetting + 1)
 299                 return -ENOENT;
 300         *alts = &iface->altsetting[altsetting];
 301         altsd = get_iface_desc(*alts);
 302         if (altsd->bAlternateSetting != altsetting ||
 303             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 304             (altsd->bInterfaceSubClass != 2 &&
 305              altsd->bInterfaceProtocol != 2   ) ||
 306             altsd->bNumEndpoints < 1)
 307                 return -ENOENT;
 308         epd = get_endpoint(*alts, 0);
 309         if (!usb_endpoint_is_isoc_in(epd) ||
 310             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 311                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 312                 return -ENOENT;
 313         *ep = epd->bEndpointAddress;
 314         return 0;
 315 }
 316
 317 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 318  * applies. Returns 1 if a quirk was found.
 319  */
 320 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 321                                          struct usb_device *dev,
 322                                          struct usb_interface_descriptor *altsd,
 323                                          unsigned int attr)
 324 {
 325         struct usb_host_interface *alts;
 326         struct usb_interface *iface;
 327         unsigned int ep;
 328         unsigned int ifnum;
 329
 330         /* Implicit feedback sync EPs consumers are always playback EPs */
 331         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 332                 return 0;
 333
 334         switch (subs->stream->chip->usb_id) {
 335         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 336         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 337                 ep = 0x81;
 338                 ifnum = 3;
 339                 goto add_sync_ep_from_ifnum;
 340         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 341         case USB_ID(0x0763, 0x2081):
 342                 ep = 0x81;
 343                 ifnum = 2;
 344                 goto add_sync_ep_from_ifnum;
 345         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 346                 ep = 0x86;
 347                 ifnum = 2;
 348                 goto add_sync_ep_from_ifnum;
 349         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 350                 ep = 0x81;
 351                 ifnum = 2;
 352                 goto add_sync_ep_from_ifnum;
 353         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 354                 ep = 0x81;
 355                 ifnum = 1;
 356                 goto add_sync_ep_from_ifnum;
 357         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
 358                 ep = 0x84;
 359                 ifnum = 0;
 360                 goto add_sync_ep_from_ifnum;
 361         }
 362
 363         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 364             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 365             altsd->bInterfaceProtocol == 2 &&
 366             altsd->bNumEndpoints == 1 &&
 367             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 368             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 369                                       altsd->bAlternateSetting,
 370                                       &alts, &ep) >= 0) {
 371                 goto add_sync_ep;
 372         }
 373
 374         /* No quirk */
 375         return 0;
 376
 377 add_sync_ep_from_ifnum:
 378         iface = usb_ifnum_to_if(dev, ifnum);
 379
 380         if (!iface || iface->num_altsetting == 0)
 381                 return -EINVAL;
 382
 383         alts = &iface->altsetting[1];
 384
 385 add_sync_ep:
 386         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 387                                                    alts, ep, !subs->direction,
 388                                                    SND_USB_ENDPOINT_TYPE_DATA);
 389         if (!subs->sync_endpoint)
 390                 return -EINVAL;
 391
 392         subs->data_endpoint->sync_master = subs->sync_endpoint;
 393
 394         return 1;
 395 }
 396
 397 static int set_sync_endpoint(struct snd_usb_substream *subs,
 398                              struct audioformat *fmt,
 399                              struct usb_device *dev,
 400                              struct usb_host_interface *alts,
 401                              struct usb_interface_descriptor *altsd)
 402 {
 403         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 404         unsigned int ep, attr;
 405         bool implicit_fb;
 406         int err;
 407
 408         /* we need a sync pipe in async OUT or adaptive IN mode */
 409         /* check the number of EP, since some devices have broken
 410          * descriptors which fool us.  if it has only one EP,
 411          * assume it as adaptive-out or sync-in.
 412          */
 413         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 414
 415         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 416                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 417
 418                 /*
 419                  * In these modes the notion of sync_endpoint is irrelevant.
 420                  * Reset pointers to avoid using stale data from previously
 421                  * used settings, e.g. when configuration and endpoints were
 422                  * changed
 423                  */
 424
 425                 subs->sync_endpoint = NULL;
 426                 subs->data_endpoint->sync_master = NULL;
 427         }
 428
 429         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 430         if (err < 0)
 431                 return err;
 432
 433         /* endpoint set by quirk */
 434         if (err > 0)
 435                 return 0;
 436
 437         if (altsd->bNumEndpoints < 2)
 438                 return 0;
 439
 440         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 441                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 442             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 443                 return 0;
 444
 445         /*
 446          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 447          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 448          * error fall back to SYNC mode and don't create sync endpoint
 449          */
 450
 451         /* check sync-pipe endpoint */
 452         /* ... and check descriptor size before accessing bSynchAddress
 453            because there is a version of the SB Audigy 2 NX firmware lacking
 454            the audio fields in the endpoint descriptors */
 455         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 456             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 457              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 458                 dev_err(&dev->dev,
 459                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 460                            fmt->iface, fmt->altsetting,
 461                            get_endpoint(alts, 1)->bmAttributes,
 462                            get_endpoint(alts, 1)->bLength,
 463                            get_endpoint(alts, 1)->bSynchAddress);
 464                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 465                         return 0;
 466                 return -EINVAL;
 467         }
 468         ep = get_endpoint(alts, 1)->bEndpointAddress;
 469         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 470             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 471              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 472                 dev_err(&dev->dev,
 473                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 474                            fmt->iface, fmt->altsetting,
 475                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 476                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 477                         return 0;
 478                 return -EINVAL;
 479         }
 480
 481         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 482                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 483
 484         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 485                                                    alts, ep, !subs->direction,
 486                                                    implicit_fb ?
 487                                                         SND_USB_ENDPOINT_TYPE_DATA :
 488                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 489         if (!subs->sync_endpoint) {
 490                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 491                         return 0;
 492                 return -EINVAL;
 493         }
 494
 495         subs->data_endpoint->sync_master = subs->sync_endpoint;
 496
 497         return 0;
 498 }
 499
 500 /*
 501  * find a matching format and set up the interface
 502  */
 503 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 504 {
 505         struct usb_device *dev = subs->dev;
 506         struct usb_host_interface *alts;
 507         struct usb_interface_descriptor *altsd;
 508         struct usb_interface *iface;
 509         int err;
 510
 511         iface = usb_ifnum_to_if(dev, fmt->iface);
 512         if (WARN_ON(!iface))
 513                 return -EINVAL;
 514         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 515         altsd = get_iface_desc(alts);
 516         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 517                 return -EINVAL;
 518
 519         if (fmt == subs->cur_audiofmt)
 520                 return 0;
 521
 522         /* close the old interface */
 523         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 524                 if (!subs->stream->chip->keep_iface) {
 525                         err = usb_set_interface(subs->dev, subs->interface, 0);
 526                         if (err < 0) {
 527                                 dev_err(&dev->dev,
 528                                         "%d:%d: return to setting 0 failed (%d)\n",
 529                                         fmt->iface, fmt->altsetting, err);
 530                                 return -EIO;
 531                         }
 532                 }
 533                 subs->interface = -1;
 534                 subs->altset_idx = 0;
 535         }
 536
 537         /* set interface */
 538         if (iface->cur_altsetting != alts) {
 539                 err = snd_usb_select_mode_quirk(subs, fmt);
 540                 if (err < 0)
 541                         return -EIO;
 542
 543                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 544                 if (err < 0) {
 545                         dev_err(&dev->dev,
 546                                 "%d:%d: usb_set_interface failed (%d)\n",
 547                                 fmt->iface, fmt->altsetting, err);
 548                         return -EIO;
 549                 }
 550                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 551                         fmt->iface, fmt->altsetting);
 552                 snd_usb_set_interface_quirk(dev);
 553         }
 554
 555         subs->interface = fmt->iface;
 556         subs->altset_idx = fmt->altset_idx;
 557         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 558                                                    alts, fmt->endpoint, subs->direction,
 559                                                    SND_USB_ENDPOINT_TYPE_DATA);
 560
 561         if (!subs->data_endpoint)
 562                 return -EINVAL;
 563
 564         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 565         if (err < 0)
 566                 return err;
 567
 568         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 569         if (err < 0)
 570                 return err;
 571
 572         subs->cur_audiofmt = fmt;
 573
 574         snd_usb_set_format_quirk(subs, fmt);
 575
 576         return 0;
 577 }
 578
 579 /*
 580  * Return the score of matching two audioformats.
 581  * Veto the audioformat if:
 582  * - It has no channels for some reason.
 583  * - Requested PCM format is not supported.
 584  * - Requested sample rate is not supported.
 585  */
 586 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 587                                        struct audioformat *fp,
 588                                        struct audioformat *match, int rate,
 589                                        snd_pcm_format_t pcm_format)
 590 {
 591         int i;
 592         int score = 0;
 593
 594         if (fp->channels < 1) {
 595                 dev_dbg(&subs->dev->dev,
 596                         "%s: (fmt @%p) no channels\n", __func__, fp);
 597                 return 0;
 598         }
 599
 600         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 601                 dev_dbg(&subs->dev->dev,
 602                         "%s: (fmt @%p) no match for format %d\n", __func__,
 603                         fp, pcm_format);
 604                 return 0;
 605         }
 606
 607         for (i = 0; i < fp->nr_rates; i++) {
 608                 if (fp->rate_table[i] == rate) {
 609                         score++;
 610                         break;
 611                 }
 612         }
 613         if (!score) {
 614                 dev_dbg(&subs->dev->dev,
 615                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 616                         fp, rate);
 617                 return 0;
 618         }
 619
 620         if (fp->channels == match->channels)
 621                 score++;
 622
 623         dev_dbg(&subs->dev->dev,
 624                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 625
 626         return score;
 627 }
 628
 629 /*
 630  * Configure the sync ep using the rate and pcm format of the data ep.
 631  */
 632 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 633 {
 634         int ret;
 635         struct audioformat *fp;
 636         struct audioformat *sync_fp = NULL;
 637         int cur_score = 0;
 638         int sync_period_bytes = subs->period_bytes;
 639         struct snd_usb_substream *sync_subs =
 640                 &subs->stream->substream[subs->direction ^ 1];
 641
 642         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 643             !subs->stream)
 644                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 645                                                    subs->pcm_format,
 646                                                    subs->channels,
 647                                                    subs->period_bytes,
 648                                                    0, 0,
 649                                                    subs->cur_rate,
 650                                                    subs->cur_audiofmt,
 651                                                    NULL);
 652
 653         /* Try to find the best matching audioformat. */
 654         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 655                 int score = match_endpoint_audioformats(subs,
 656                                                         fp, subs->cur_audiofmt,
 657                         subs->cur_rate, subs->pcm_format);
 658
 659                 if (score > cur_score) {
 660                         sync_fp = fp;
 661                         cur_score = score;
 662                 }
 663         }
 664
 665         if (unlikely(sync_fp == NULL)) {
 666                 dev_err(&subs->dev->dev,
 667                         "%s: no valid audioformat for sync ep %x found\n",
 668                         __func__, sync_subs->ep_num);
 669                 return -EINVAL;
 670         }
 671
 672         /*
 673          * Recalculate the period bytes if channel number differ between
 674          * data and sync ep audioformat.
 675          */
 676         if (sync_fp->channels != subs->channels) {
 677                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 678                         sync_fp->channels;
 679                 dev_dbg(&subs->dev->dev,
 680                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 681                         __func__, subs->period_bytes, sync_period_bytes);
 682         }
 683
 684         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 685                                           subs->pcm_format,
 686                                           sync_fp->channels,
 687                                           sync_period_bytes,
 688                                           0, 0,
 689                                           subs->cur_rate,
 690                                           sync_fp,
 691                                           NULL);
 692
 693         return ret;
 694 }
 695
 696 /*
 697  * configure endpoint params
 698  *
 699  * called  during initial setup and upon resume
 700  */
 701 static int configure_endpoint(struct snd_usb_substream *subs)
 702 {
 703         int ret;
 704
 705         /* format changed */
 706         stop_endpoints(subs, true);
 707         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 708                                           subs->pcm_format,
 709                                           subs->channels,
 710                                           subs->period_bytes,
 711                                           subs->period_frames,
 712                                           subs->buffer_periods,
 713                                           subs->cur_rate,
 714                                           subs->cur_audiofmt,
 715                                           subs->sync_endpoint);
 716         if (ret < 0)
 717                 return ret;
 718
 719         if (subs->sync_endpoint)
 720                 ret = configure_sync_endpoint(subs);
 721
 722         return ret;
 723 }
 724
 725 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 726 {
 727         int ret;
 728
 729         if (!subs->str_pd)
 730                 return 0;
 731
 732         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 733         if (ret < 0) {
 734                 dev_err(&subs->dev->dev,
 735                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 736                         subs->str_pd->pd_id, state, ret);
 737                 return ret;
 738         }
 739
 740         return 0;
 741 }
 742
 743 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 744 {
 745         int ret;
 746
 747         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 748         if (ret < 0)
 749                 return ret;
 750
 751         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 752         if (ret < 0)
 753                 return ret;
 754
 755         return 0;
 756 }
 757
 758 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 759 {
 760         int ret;
 761
 762         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 763         if (ret < 0)
 764                 return ret;
 765
 766         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 767         if (ret < 0)
 768                 return ret;
 769
 770         return 0;
 771 }
 772
 773 /*
 774  * hw_params callback
 775  *
 776  * allocate a buffer and set the given audio format.
 777  *
 778  * so far we use a physically linear buffer although packetize transfer
 779  * doesn't need a continuous area.
 780  * if sg buffer is supported on the later version of alsa, we'll follow
 781  * that.
 782  */
 783 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 784                              struct snd_pcm_hw_params *hw_params)
 785 {
 786         struct snd_usb_substream *subs = substream->runtime->private_data;
 787         struct audioformat *fmt;
 788         int ret;
 789
 790         if (snd_usb_use_vmalloc)
 791                 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 792                                                        params_buffer_bytes(hw_params));
 793         else
 794                 ret = snd_pcm_lib_malloc_pages(substream,
 795                                                params_buffer_bytes(hw_params));
 796         if (ret < 0)
 797                 return ret;
 798
 799         subs->pcm_format = params_format(hw_params);
 800         subs->period_bytes = params_period_bytes(hw_params);
 801         subs->period_frames = params_period_size(hw_params);
 802         subs->buffer_periods = params_periods(hw_params);
 803         subs->channels = params_channels(hw_params);
 804         subs->cur_rate = params_rate(hw_params);
 805
 806         fmt = find_format(subs);
 807         if (!fmt) {
 808                 dev_dbg(&subs->dev->dev,
 809                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 810                            subs->pcm_format, subs->cur_rate, subs->channels);
 811                 return -EINVAL;
 812         }
 813
 814         ret = snd_usb_lock_shutdown(subs->stream->chip);
 815         if (ret < 0)
 816                 return ret;
 817
 818         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 819         if (ret < 0)
 820                 goto unlock;
 821
 822         ret = set_format(subs, fmt);
 823         if (ret < 0)
 824                 goto unlock;
 825
 826         subs->interface = fmt->iface;
 827         subs->altset_idx = fmt->altset_idx;
 828         subs->need_setup_ep = true;
 829
 830  unlock:
 831         snd_usb_unlock_shutdown(subs->stream->chip);
 832         return ret;
 833 }
 834
 835 /*
 836  * hw_free callback
 837  *
 838  * reset the audio format and release the buffer
 839  */
 840 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 841 {
 842         struct snd_usb_substream *subs = substream->runtime->private_data;
 843
 844         subs->cur_audiofmt = NULL;
 845         subs->cur_rate = 0;
 846         subs->period_bytes = 0;
 847         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 848                 stop_endpoints(subs, true);
 849                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 850                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 851                 snd_usb_unlock_shutdown(subs->stream->chip);
 852         }
 853
 854         if (snd_usb_use_vmalloc)
 855                 return snd_pcm_lib_free_vmalloc_buffer(substream);
 856         else
 857                 return snd_pcm_lib_free_pages(substream);
 858 }
 859
 860 /*
 861  * prepare callback
 862  *
 863  * only a few subtle things...
 864  */
 865 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 866 {
 867         struct snd_pcm_runtime *runtime = substream->runtime;
 868         struct snd_usb_substream *subs = runtime->private_data;
 869         struct usb_host_interface *alts;
 870         struct usb_interface *iface;
 871         int ret;
 872
 873         if (! subs->cur_audiofmt) {
 874                 dev_err(&subs->dev->dev, "no format is specified!\n");
 875                 return -ENXIO;
 876         }
 877
 878         ret = snd_usb_lock_shutdown(subs->stream->chip);
 879         if (ret < 0)
 880                 return ret;
 881         if (snd_BUG_ON(!subs->data_endpoint)) {
 882                 ret = -EIO;
 883                 goto unlock;
 884         }
 885
 886         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 887         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 888
 889         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 890         if (ret < 0)
 891                 goto unlock;
 892
 893         ret = set_format(subs, subs->cur_audiofmt);
 894         if (ret < 0)
 895                 goto unlock;
 896
 897         if (subs->need_setup_ep) {
 898
 899                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 900                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 901                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 902                                                subs->cur_audiofmt->iface,
 903                                                alts,
 904                                                subs->cur_audiofmt,
 905                                                subs->cur_rate);
 906                 if (ret < 0)
 907                         goto unlock;
 908
 909                 ret = configure_endpoint(subs);
 910                 if (ret < 0)
 911                         goto unlock;
 912                 subs->need_setup_ep = false;
 913         }
 914
 915         /* some unit conversions in runtime */
 916         subs->data_endpoint->maxframesize =
 917                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 918         subs->data_endpoint->curframesize =
 919                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 920
 921         /* reset the pointer */
 922         subs->hwptr_done = 0;
 923         subs->transfer_done = 0;
 924         subs->last_delay = 0;
 925         subs->last_frame_number = 0;
 926         runtime->delay = 0;
 927
 928         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 929          * updates for all URBs would happen at the same time when starting */
 930         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 931                 ret = start_endpoints(subs);
 932
 933  unlock:
 934         snd_usb_unlock_shutdown(subs->stream->chip);
 935         return ret;
 936 }
 937
 938 static const struct snd_pcm_hardware snd_usb_hardware =
 939 {
 940         .info =                 SNDRV_PCM_INFO_MMAP |
 941                                 SNDRV_PCM_INFO_MMAP_VALID |
 942                                 SNDRV_PCM_INFO_BATCH |
 943                                 SNDRV_PCM_INFO_INTERLEAVED |
 944                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 945                                 SNDRV_PCM_INFO_PAUSE,
 946         .buffer_bytes_max =     1024 * 1024,
 947         .period_bytes_min =     64,
 948         .period_bytes_max =     512 * 1024,
 949         .periods_min =          2,
 950         .periods_max =          1024,
 951 };
 952
 953 static int hw_check_valid_format(struct snd_usb_substream *subs,
 954                                  struct snd_pcm_hw_params *params,
 955                                  struct audioformat *fp)
 956 {
 957         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 958         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 959         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 960         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 961         struct snd_mask check_fmts;
 962         unsigned int ptime;
 963
 964         /* check the format */
 965         snd_mask_none(&check_fmts);
 966         check_fmts.bits[0] = (u32)fp->formats;
 967         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 968         snd_mask_intersect(&check_fmts, fmts);
 969         if (snd_mask_empty(&check_fmts)) {
 970                 hwc_debug("   > check: no supported format %d\n", fp->format);
 971                 return 0;
 972         }
 973         /* check the channels */
 974         if (fp->channels < ct->min || fp->channels > ct->max) {
 975                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 976                 return 0;
 977         }
 978         /* check the rate is within the range */
 979         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 980                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 981                 return 0;
 982         }
 983         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 984                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 985                 return 0;
 986         }
 987         /* check whether the period time is >= the data packet interval */
 988         if (subs->speed != USB_SPEED_FULL) {
 989                 ptime = 125 * (1 << fp->datainterval);
 990                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 991                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 992                         return 0;
 993                 }
 994         }
 995         return 1;
 996 }
 997
 998 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 999                         struct snd_pcm_hw_rule *rule)
1000 {
1001         struct snd_usb_substream *subs = rule->private;
1002         struct audioformat *fp;
1003         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1004         unsigned int rmin, rmax;
1005         int changed;
1006
1007         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1008         changed = 0;
1009         rmin = rmax = 0;
1010         list_for_each_entry(fp, &subs->fmt_list, list) {
1011                 if (!hw_check_valid_format(subs, params, fp))
1012                         continue;
1013                 if (changed++) {
1014                         if (rmin > fp->rate_min)
1015                                 rmin = fp->rate_min;
1016                         if (rmax < fp->rate_max)
1017                                 rmax = fp->rate_max;
1018                 } else {
1019                         rmin = fp->rate_min;
1020                         rmax = fp->rate_max;
1021                 }
1022         }
1023
1024         if (!changed) {
1025                 hwc_debug("  --> get empty\n");
1026                 it->empty = 1;
1027                 return -EINVAL;
1028         }
1029
1030         changed = 0;
1031         if (it->min < rmin) {
1032                 it->min = rmin;
1033                 it->openmin = 0;
1034                 changed = 1;
1035         }
1036         if (it->max > rmax) {
1037                 it->max = rmax;
1038                 it->openmax = 0;
1039                 changed = 1;
1040         }
1041         if (snd_interval_checkempty(it)) {
1042                 it->empty = 1;
1043                 return -EINVAL;
1044         }
1045         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1046         return changed;
1047 }
1048
1049
1050 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1051                             struct snd_pcm_hw_rule *rule)
1052 {
1053         struct snd_usb_substream *subs = rule->private;
1054         struct audioformat *fp;
1055         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1056         unsigned int rmin, rmax;
1057         int changed;
1058
1059         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1060         changed = 0;
1061         rmin = rmax = 0;
1062         list_for_each_entry(fp, &subs->fmt_list, list) {
1063                 if (!hw_check_valid_format(subs, params, fp))
1064                         continue;
1065                 if (changed++) {
1066                         if (rmin > fp->channels)
1067                                 rmin = fp->channels;
1068                         if (rmax < fp->channels)
1069                                 rmax = fp->channels;
1070                 } else {
1071                         rmin = fp->channels;
1072                         rmax = fp->channels;
1073                 }
1074         }
1075
1076         if (!changed) {
1077                 hwc_debug("  --> get empty\n");
1078                 it->empty = 1;
1079                 return -EINVAL;
1080         }
1081
1082         changed = 0;
1083         if (it->min < rmin) {
1084                 it->min = rmin;
1085                 it->openmin = 0;
1086                 changed = 1;
1087         }
1088         if (it->max > rmax) {
1089                 it->max = rmax;
1090                 it->openmax = 0;
1091                 changed = 1;
1092         }
1093         if (snd_interval_checkempty(it)) {
1094                 it->empty = 1;
1095                 return -EINVAL;
1096         }
1097         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1098         return changed;
1099 }
1100
1101 static int hw_rule_format(struct snd_pcm_hw_params *params,
1102                           struct snd_pcm_hw_rule *rule)
1103 {
1104         struct snd_usb_substream *subs = rule->private;
1105         struct audioformat *fp;
1106         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1107         u64 fbits;
1108         u32 oldbits[2];
1109         int changed;
1110
1111         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1112         fbits = 0;
1113         list_for_each_entry(fp, &subs->fmt_list, list) {
1114                 if (!hw_check_valid_format(subs, params, fp))
1115                         continue;
1116                 fbits |= fp->formats;
1117         }
1118
1119         oldbits[0] = fmt->bits[0];
1120         oldbits[1] = fmt->bits[1];
1121         fmt->bits[0] &= (u32)fbits;
1122         fmt->bits[1] &= (u32)(fbits >> 32);
1123         if (!fmt->bits[0] && !fmt->bits[1]) {
1124                 hwc_debug("  --> get empty\n");
1125                 return -EINVAL;
1126         }
1127         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1128         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1129         return changed;
1130 }
1131
1132 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1133                                struct snd_pcm_hw_rule *rule)
1134 {
1135         struct snd_usb_substream *subs = rule->private;
1136         struct audioformat *fp;
1137         struct snd_interval *it;
1138         unsigned char min_datainterval;
1139         unsigned int pmin;
1140         int changed;
1141
1142         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1143         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1144         min_datainterval = 0xff;
1145         list_for_each_entry(fp, &subs->fmt_list, list) {
1146                 if (!hw_check_valid_format(subs, params, fp))
1147                         continue;
1148                 min_datainterval = min(min_datainterval, fp->datainterval);
1149         }
1150         if (min_datainterval == 0xff) {
1151                 hwc_debug("  --> get empty\n");
1152                 it->empty = 1;
1153                 return -EINVAL;
1154         }
1155         pmin = 125 * (1 << min_datainterval);
1156         changed = 0;
1157         if (it->min < pmin) {
1158                 it->min = pmin;
1159                 it->openmin = 0;
1160                 changed = 1;
1161         }
1162         if (snd_interval_checkempty(it)) {
1163                 it->empty = 1;
1164                 return -EINVAL;
1165         }
1166         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1167         return changed;
1168 }
1169
1170 /*
1171  *  If the device supports unusual bit rates, does the request meet these?
1172  */
1173 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1174                                   struct snd_usb_substream *subs)
1175 {
1176         struct audioformat *fp;
1177         int *rate_list;
1178         int count = 0, needs_knot = 0;
1179         int err;
1180
1181         kfree(subs->rate_list.list);
1182         subs->rate_list.list = NULL;
1183
1184         list_for_each_entry(fp, &subs->fmt_list, list) {
1185                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1186                         return 0;
1187                 count += fp->nr_rates;
1188                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1189                         needs_knot = 1;
1190         }
1191         if (!needs_knot)
1192                 return 0;
1193
1194         subs->rate_list.list = rate_list =
1195                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1196         if (!subs->rate_list.list)
1197                 return -ENOMEM;
1198         subs->rate_list.count = count;
1199         subs->rate_list.mask = 0;
1200         count = 0;
1201         list_for_each_entry(fp, &subs->fmt_list, list) {
1202                 int i;
1203                 for (i = 0; i < fp->nr_rates; i++)
1204                         rate_list[count++] = fp->rate_table[i];
1205         }
1206         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1207                                          &subs->rate_list);
1208         if (err < 0)
1209                 return err;
1210
1211         return 0;
1212 }
1213
1214
1215 /*
1216  * set up the runtime hardware information.
1217  */
1218
1219 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1220 {
1221         struct audioformat *fp;
1222         unsigned int pt, ptmin;
1223         int param_period_time_if_needed;
1224         int err;
1225
1226         runtime->hw.formats = subs->formats;
1227
1228         runtime->hw.rate_min = 0x7fffffff;
1229         runtime->hw.rate_max = 0;
1230         runtime->hw.channels_min = 256;
1231         runtime->hw.channels_max = 0;
1232         runtime->hw.rates = 0;
1233         ptmin = UINT_MAX;
1234         /* check min/max rates and channels */
1235         list_for_each_entry(fp, &subs->fmt_list, list) {
1236                 runtime->hw.rates |= fp->rates;
1237                 if (runtime->hw.rate_min > fp->rate_min)
1238                         runtime->hw.rate_min = fp->rate_min;
1239                 if (runtime->hw.rate_max < fp->rate_max)
1240                         runtime->hw.rate_max = fp->rate_max;
1241                 if (runtime->hw.channels_min > fp->channels)
1242                         runtime->hw.channels_min = fp->channels;
1243                 if (runtime->hw.channels_max < fp->channels)
1244                         runtime->hw.channels_max = fp->channels;
1245                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1246                         /* FIXME: there might be more than one audio formats... */
1247                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1248                                 fp->frame_size;
1249                 }
1250                 pt = 125 * (1 << fp->datainterval);
1251                 ptmin = min(ptmin, pt);
1252         }
1253
1254         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1255         if (subs->speed == USB_SPEED_FULL)
1256                 /* full speed devices have fixed data packet interval */
1257                 ptmin = 1000;
1258         if (ptmin == 1000)
1259                 /* if period time doesn't go below 1 ms, no rules needed */
1260                 param_period_time_if_needed = -1;
1261
1262         err = snd_pcm_hw_constraint_minmax(runtime,
1263                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1264                                            ptmin, UINT_MAX);
1265         if (err < 0)
1266                 return err;
1267
1268         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1269                                   hw_rule_rate, subs,
1270                                   SNDRV_PCM_HW_PARAM_FORMAT,
1271                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1272                                   param_period_time_if_needed,
1273                                   -1);
1274         if (err < 0)
1275                 return err;
1276         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1277                                   hw_rule_channels, subs,
1278                                   SNDRV_PCM_HW_PARAM_FORMAT,
1279                                   SNDRV_PCM_HW_PARAM_RATE,
1280                                   param_period_time_if_needed,
1281                                   -1);
1282         if (err < 0)
1283                 return err;
1284         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1285                                   hw_rule_format, subs,
1286                                   SNDRV_PCM_HW_PARAM_RATE,
1287                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1288                                   param_period_time_if_needed,
1289                                   -1);
1290         if (err < 0)
1291                 return err;
1292         if (param_period_time_if_needed >= 0) {
1293                 err = snd_pcm_hw_rule_add(runtime, 0,
1294                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1295                                           hw_rule_period_time, subs,
1296                                           SNDRV_PCM_HW_PARAM_FORMAT,
1297                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1298                                           SNDRV_PCM_HW_PARAM_RATE,
1299                                           -1);
1300                 if (err < 0)
1301                         return err;
1302         }
1303         err = snd_usb_pcm_check_knot(runtime, subs);
1304         if (err < 0)
1305                 return err;
1306
1307         return snd_usb_autoresume(subs->stream->chip);
1308 }
1309
1310 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1311 {
1312         int direction = substream->stream;
1313         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1314         struct snd_pcm_runtime *runtime = substream->runtime;
1315         struct snd_usb_substream *subs = &as->substream[direction];
1316
1317         subs->interface = -1;
1318         subs->altset_idx = 0;
1319         runtime->hw = snd_usb_hardware;
1320         runtime->private_data = subs;
1321         subs->pcm_substream = substream;
1322         /* runtime PM is also done there */
1323
1324         /* initialize DSD/DOP context */
1325         subs->dsd_dop.byte_idx = 0;
1326         subs->dsd_dop.channel = 0;
1327         subs->dsd_dop.marker = 1;
1328
1329         return setup_hw_info(runtime, subs);
1330 }
1331
1332 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1333 {
1334         int direction = substream->stream;
1335         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1336         struct snd_usb_substream *subs = &as->substream[direction];
1337         int ret;
1338
1339         stop_endpoints(subs, true);
1340
1341         if (!as->chip->keep_iface &&
1342             subs->interface >= 0 &&
1343             !snd_usb_lock_shutdown(subs->stream->chip)) {
1344                 usb_set_interface(subs->dev, subs->interface, 0);
1345                 subs->interface = -1;
1346                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1347                 snd_usb_unlock_shutdown(subs->stream->chip);
1348                 if (ret < 0)
1349                         return ret;
1350         }
1351
1352         subs->pcm_substream = NULL;
1353         snd_usb_autosuspend(subs->stream->chip);
1354
1355         return 0;
1356 }
1357
1358 /* Since a URB can handle only a single linear buffer, we must use double
1359  * buffering when the data to be transferred overflows the buffer boundary.
1360  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1361  * for all URBs.
1362  */
1363 static void retire_capture_urb(struct snd_usb_substream *subs,
1364                                struct urb *urb)
1365 {
1366         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1367         unsigned int stride, frames, bytes, oldptr;
1368         int i, period_elapsed = 0;
1369         unsigned long flags;
1370         unsigned char *cp;
1371         int current_frame_number;
1372
1373         /* read frame number here, update pointer in critical section */
1374         current_frame_number = usb_get_current_frame_number(subs->dev);
1375
1376         stride = runtime->frame_bits >> 3;
1377
1378         for (i = 0; i < urb->number_of_packets; i++) {
1379                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1380                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1381                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1382                                 i, urb->iso_frame_desc[i].status);
1383                         // continue;
1384                 }
1385                 bytes = urb->iso_frame_desc[i].actual_length;
1386                 frames = bytes / stride;
1387                 if (!subs->txfr_quirk)
1388                         bytes = frames * stride;
1389                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1390                         int oldbytes = bytes;
1391                         bytes = frames * stride;
1392                         dev_warn_ratelimited(&subs->dev->dev,
1393                                  "Corrected urb data len. %d->%d\n",
1394                                                         oldbytes, bytes);
1395                 }
1396                 /* update the current pointer */
1397                 spin_lock_irqsave(&subs->lock, flags);
1398                 oldptr = subs->hwptr_done;
1399                 subs->hwptr_done += bytes;
1400                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1401                         subs->hwptr_done -= runtime->buffer_size * stride;
1402                 frames = (bytes + (oldptr % stride)) / stride;
1403                 subs->transfer_done += frames;
1404                 if (subs->transfer_done >= runtime->period_size) {
1405                         subs->transfer_done -= runtime->period_size;
1406                         period_elapsed = 1;
1407                 }
1408                 /* capture delay is by construction limited to one URB,
1409                  * reset delays here
1410                  */
1411                 runtime->delay = subs->last_delay = 0;
1412
1413                 /* realign last_frame_number */
1414                 subs->last_frame_number = current_frame_number;
1415                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1416
1417                 spin_unlock_irqrestore(&subs->lock, flags);
1418                 /* copy a data chunk */
1419                 if (oldptr + bytes > runtime->buffer_size * stride) {
1420                         unsigned int bytes1 =
1421                                         runtime->buffer_size * stride - oldptr;
1422                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1423                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1424                 } else {
1425                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1426                 }
1427         }
1428
1429         if (period_elapsed)
1430                 snd_pcm_period_elapsed(subs->pcm_substream);
1431 }
1432
1433 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1434                                              struct urb *urb, unsigned int bytes)
1435 {
1436         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1437         unsigned int stride = runtime->frame_bits >> 3;
1438         unsigned int dst_idx = 0;
1439         unsigned int src_idx = subs->hwptr_done;
1440         unsigned int wrap = runtime->buffer_size * stride;
1441         u8 *dst = urb->transfer_buffer;
1442         u8 *src = runtime->dma_area;
1443         u8 marker[] = { 0x05, 0xfa };
1444
1445         /*
1446          * The DSP DOP format defines a way to transport DSD samples over
1447          * normal PCM data endpoints. It requires stuffing of marker bytes
1448          * (0x05 and 0xfa, alternating per sample frame), and then expects
1449          * 2 additional bytes of actual payload. The whole frame is stored
1450          * LSB.
1451          *
1452          * Hence, for a stereo transport, the buffer layout looks like this,
1453          * where L refers to left channel samples and R to right.
1454          *
1455          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1456          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1457          *   .....
1458          *
1459          */
1460
1461         while (bytes--) {
1462                 if (++subs->dsd_dop.byte_idx == 3) {
1463                         /* frame boundary? */
1464                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1465                         src_idx += 2;
1466                         subs->dsd_dop.byte_idx = 0;
1467
1468                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1469                                 /* alternate the marker */
1470                                 subs->dsd_dop.marker++;
1471                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1472                                 subs->dsd_dop.channel = 0;
1473                         }
1474                 } else {
1475                         /* stuff the DSD payload */
1476                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1477
1478                         if (subs->cur_audiofmt->dsd_bitrev)
1479                                 dst[dst_idx++] = bitrev8(src[idx]);
1480                         else
1481                                 dst[dst_idx++] = src[idx];
1482
1483                         subs->hwptr_done++;
1484                 }
1485         }
1486         if (subs->hwptr_done >= runtime->buffer_size * stride)
1487                 subs->hwptr_done -= runtime->buffer_size * stride;
1488 }
1489
1490 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1491                         int offset, int stride, unsigned int bytes)
1492 {
1493         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1494
1495         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1496                 /* err, the transferred area goes over buffer boundary. */
1497                 unsigned int bytes1 =
1498                         runtime->buffer_size * stride - subs->hwptr_done;
1499                 memcpy(urb->transfer_buffer + offset,
1500                        runtime->dma_area + subs->hwptr_done, bytes1);
1501                 memcpy(urb->transfer_buffer + offset + bytes1,
1502                        runtime->dma_area, bytes - bytes1);
1503         } else {
1504                 memcpy(urb->transfer_buffer + offset,
1505                        runtime->dma_area + subs->hwptr_done, bytes);
1506         }
1507         subs->hwptr_done += bytes;
1508         if (subs->hwptr_done >= runtime->buffer_size * stride)
1509                 subs->hwptr_done -= runtime->buffer_size * stride;
1510 }
1511
1512 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1513                                       struct urb *urb, int stride,
1514                                       unsigned int bytes)
1515 {
1516         __le32 packet_length;
1517         int i;
1518
1519         /* Put __le32 length descriptor at start of each packet. */
1520         for (i = 0; i < urb->number_of_packets; i++) {
1521                 unsigned int length = urb->iso_frame_desc[i].length;
1522                 unsigned int offset = urb->iso_frame_desc[i].offset;
1523
1524                 packet_length = cpu_to_le32(length);
1525                 offset += i * sizeof(packet_length);
1526                 urb->iso_frame_desc[i].offset = offset;
1527                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1528                 memcpy(urb->transfer_buffer + offset,
1529                        &packet_length, sizeof(packet_length));
1530                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1531                             stride, length);
1532         }
1533         /* Adjust transfer size accordingly. */
1534         bytes += urb->number_of_packets * sizeof(packet_length);
1535         return bytes;
1536 }
1537
1538 static void prepare_playback_urb(struct snd_usb_substream *subs,
1539                                  struct urb *urb)
1540 {
1541         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1542         struct snd_usb_endpoint *ep = subs->data_endpoint;
1543         struct snd_urb_ctx *ctx = urb->context;
1544         unsigned int counts, frames, bytes;
1545         int i, stride, period_elapsed = 0;
1546         unsigned long flags;
1547
1548         stride = runtime->frame_bits >> 3;
1549
1550         frames = 0;
1551         urb->number_of_packets = 0;
1552         spin_lock_irqsave(&subs->lock, flags);
1553         subs->frame_limit += ep->max_urb_frames;
1554         for (i = 0; i < ctx->packets; i++) {
1555                 if (ctx->packet_size[i])
1556                         counts = ctx->packet_size[i];
1557                 else
1558                         counts = snd_usb_endpoint_next_packet_size(ep);
1559
1560                 /* set up descriptor */
1561                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1562                 urb->iso_frame_desc[i].length = counts * ep->stride;
1563                 frames += counts;
1564                 urb->number_of_packets++;
1565                 subs->transfer_done += counts;
1566                 if (subs->transfer_done >= runtime->period_size) {
1567                         subs->transfer_done -= runtime->period_size;
1568                         subs->frame_limit = 0;
1569                         period_elapsed = 1;
1570                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1571                                 if (subs->transfer_done > 0) {
1572                                         /* FIXME: fill-max mode is not
1573                                          * supported yet */
1574                                         frames -= subs->transfer_done;
1575                                         counts -= subs->transfer_done;
1576                                         urb->iso_frame_desc[i].length =
1577                                                 counts * ep->stride;
1578                                         subs->transfer_done = 0;
1579                                 }
1580                                 i++;
1581                                 if (i < ctx->packets) {
1582                                         /* add a transfer delimiter */
1583                                         urb->iso_frame_desc[i].offset =
1584                                                 frames * ep->stride;
1585                                         urb->iso_frame_desc[i].length = 0;
1586                                         urb->number_of_packets++;
1587                                 }
1588                                 break;
1589                         }
1590                 }
1591                 /* finish at the period boundary or after enough frames */
1592                 if ((period_elapsed ||
1593                                 subs->transfer_done >= subs->frame_limit) &&
1594                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1595                         break;
1596         }
1597         bytes = frames * ep->stride;
1598
1599         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1600                      subs->cur_audiofmt->dsd_dop)) {
1601                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1602         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1603                            subs->cur_audiofmt->dsd_bitrev)) {
1604                 /* bit-reverse the bytes */
1605                 u8 *buf = urb->transfer_buffer;
1606                 for (i = 0; i < bytes; i++) {
1607                         int idx = (subs->hwptr_done + i)
1608                                 % (runtime->buffer_size * stride);
1609                         buf[i] = bitrev8(runtime->dma_area[idx]);
1610                 }
1611
1612                 subs->hwptr_done += bytes;
1613                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1614                         subs->hwptr_done -= runtime->buffer_size * stride;
1615         } else {
1616                 /* usual PCM */
1617                 if (!subs->tx_length_quirk)
1618                         copy_to_urb(subs, urb, 0, stride, bytes);
1619                 else
1620                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1621                         /* bytes is now amount of outgoing data */
1622         }
1623
1624         /* update delay with exact number of samples queued */
1625         runtime->delay = subs->last_delay;
1626         runtime->delay += frames;
1627         subs->last_delay = runtime->delay;
1628
1629         /* realign last_frame_number */
1630         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1631         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1632
1633         if (subs->trigger_tstamp_pending_update) {
1634                 /* this is the first actual URB submitted,
1635                  * update trigger timestamp to reflect actual start time
1636                  */
1637                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1638                 subs->trigger_tstamp_pending_update = false;
1639         }
1640
1641         spin_unlock_irqrestore(&subs->lock, flags);
1642         urb->transfer_buffer_length = bytes;
1643         if (period_elapsed)
1644                 snd_pcm_period_elapsed(subs->pcm_substream);
1645 }
1646
1647 /*
1648  * process after playback data complete
1649  * - decrease the delay count again
1650  */
1651 static void retire_playback_urb(struct snd_usb_substream *subs,
1652                                struct urb *urb)
1653 {
1654         unsigned long flags;
1655         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1656         struct snd_usb_endpoint *ep = subs->data_endpoint;
1657         int processed = urb->transfer_buffer_length / ep->stride;
1658         int est_delay;
1659
1660         /* ignore the delay accounting when procssed=0 is given, i.e.
1661          * silent payloads are procssed before handling the actual data
1662          */
1663         if (!processed)
1664                 return;
1665
1666         spin_lock_irqsave(&subs->lock, flags);
1667         if (!subs->last_delay)
1668                 goto out; /* short path */
1669
1670         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1671         /* update delay with exact number of samples played */
1672         if (processed > subs->last_delay)
1673                 subs->last_delay = 0;
1674         else
1675                 subs->last_delay -= processed;
1676         runtime->delay = subs->last_delay;
1677
1678         /*
1679          * Report when delay estimate is off by more than 2ms.
1680          * The error should be lower than 2ms since the estimate relies
1681          * on two reads of a counter updated every ms.
1682          */
1683         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1684                 dev_dbg_ratelimited(&subs->dev->dev,
1685                         "delay: estimated %d, actual %d\n",
1686                         est_delay, subs->last_delay);
1687
1688         if (!subs->running) {
1689                 /* update last_frame_number for delay counting here since
1690                  * prepare_playback_urb won't be called during pause
1691                  */
1692                 subs->last_frame_number =
1693                         usb_get_current_frame_number(subs->dev) & 0xff;
1694         }
1695
1696  out:
1697         spin_unlock_irqrestore(&subs->lock, flags);
1698 }
1699
1700 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1701                                               int cmd)
1702 {
1703         struct snd_usb_substream *subs = substream->runtime->private_data;
1704
1705         switch (cmd) {
1706         case SNDRV_PCM_TRIGGER_START:
1707                 subs->trigger_tstamp_pending_update = true;
1708                 /* fall through */
1709         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1710                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1711                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1712                 subs->running = 1;
1713                 return 0;
1714         case SNDRV_PCM_TRIGGER_STOP:
1715                 stop_endpoints(subs, false);
1716                 subs->running = 0;
1717                 return 0;
1718         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1719                 subs->data_endpoint->prepare_data_urb = NULL;
1720                 /* keep retire_data_urb for delay calculation */
1721                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1722                 subs->running = 0;
1723                 return 0;
1724         }
1725
1726         return -EINVAL;
1727 }
1728
1729 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1730                                              int cmd)
1731 {
1732         int err;
1733         struct snd_usb_substream *subs = substream->runtime->private_data;
1734
1735         switch (cmd) {
1736         case SNDRV_PCM_TRIGGER_START:
1737                 err = start_endpoints(subs);
1738                 if (err < 0)
1739                         return err;
1740
1741                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1742                 subs->running = 1;
1743                 return 0;
1744         case SNDRV_PCM_TRIGGER_STOP:
1745                 stop_endpoints(subs, false);
1746                 subs->running = 0;
1747                 return 0;
1748         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1749                 subs->data_endpoint->retire_data_urb = NULL;
1750                 subs->running = 0;
1751                 return 0;
1752         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1753                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1754                 subs->running = 1;
1755                 return 0;
1756         }
1757
1758         return -EINVAL;
1759 }
1760
1761 static const struct snd_pcm_ops snd_usb_playback_ops = {
1762         .open =         snd_usb_pcm_open,
1763         .close =        snd_usb_pcm_close,
1764         .ioctl =        snd_pcm_lib_ioctl,
1765         .hw_params =    snd_usb_hw_params,
1766         .hw_free =      snd_usb_hw_free,
1767         .prepare =      snd_usb_pcm_prepare,
1768         .trigger =      snd_usb_substream_playback_trigger,
1769         .pointer =      snd_usb_pcm_pointer,
1770         .page =         snd_pcm_lib_get_vmalloc_page,
1771 };
1772
1773 static const struct snd_pcm_ops snd_usb_capture_ops = {
1774         .open =         snd_usb_pcm_open,
1775         .close =        snd_usb_pcm_close,
1776         .ioctl =        snd_pcm_lib_ioctl,
1777         .hw_params =    snd_usb_hw_params,
1778         .hw_free =      snd_usb_hw_free,
1779         .prepare =      snd_usb_pcm_prepare,
1780         .trigger =      snd_usb_substream_capture_trigger,
1781         .pointer =      snd_usb_pcm_pointer,
1782         .page =         snd_pcm_lib_get_vmalloc_page,
1783 };
1784
1785 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1786         .open =         snd_usb_pcm_open,
1787         .close =        snd_usb_pcm_close,
1788         .ioctl =        snd_pcm_lib_ioctl,
1789         .hw_params =    snd_usb_hw_params,
1790         .hw_free =      snd_usb_hw_free,
1791         .prepare =      snd_usb_pcm_prepare,
1792         .trigger =      snd_usb_substream_playback_trigger,
1793         .pointer =      snd_usb_pcm_pointer,
1794         .page =         snd_pcm_sgbuf_ops_page,
1795 };
1796
1797 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1798         .open =         snd_usb_pcm_open,
1799         .close =        snd_usb_pcm_close,
1800         .ioctl =        snd_pcm_lib_ioctl,
1801         .hw_params =    snd_usb_hw_params,
1802         .hw_free =      snd_usb_hw_free,
1803         .prepare =      snd_usb_pcm_prepare,
1804         .trigger =      snd_usb_substream_capture_trigger,
1805         .pointer =      snd_usb_pcm_pointer,
1806         .page =         snd_pcm_sgbuf_ops_page,
1807 };
1808
1809 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1810 {
1811         const struct snd_pcm_ops *ops;
1812
1813         if (snd_usb_use_vmalloc)
1814                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1815                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1816         else
1817                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1818                         &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1819         snd_pcm_set_ops(pcm, stream, ops);
1820 }
1821
1822 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1823 {
1824         struct snd_pcm *pcm = subs->stream->pcm;
1825         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1826         struct device *dev = subs->dev->bus->controller;
1827
1828         if (!snd_usb_use_vmalloc)
1829                 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1830                                               dev, 64*1024, 512*1024);
1831 }