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