sound/usb/pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/slab.h>
   7 #include <linux/bitrev.h>
   8 #include <linux/ratelimit.h>
   9 #include <linux/usb.h>
  10 #include <linux/usb/audio.h>
  11 #include <linux/usb/audio-v2.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16
  17 #include "usbaudio.h"
  18 #include "card.h"
  19 #include "quirks.h"
  20 #include "debug.h"
  21 #include "endpoint.h"
  22 #include "helper.h"
  23 #include "pcm.h"
  24 #include "clock.h"
  25 #include "power.h"
  26 #include "media.h"
  27
  28 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  30
  31 /* return the estimated delay based on USB frame counters */
  32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33                                     unsigned int rate)
  34 {
  35         int current_frame_number;
  36         int frame_diff;
  37         int est_delay;
  38
  39         if (!subs->last_delay)
  40                 return 0; /* short path */
  41
  42         current_frame_number = usb_get_current_frame_number(subs->dev);
  43         /*
  44          * HCD implementations use different widths, use lower 8 bits.
  45          * The delay will be managed up to 256ms, which is more than
  46          * enough
  47          */
  48         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  49
  50         /* Approximation based on number of samples per USB frame (ms),
  51            some truncation for 44.1 but the estimate is good enough */
  52         est_delay =  frame_diff * rate / 1000;
  53         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  54                 est_delay = subs->last_delay - est_delay;
  55         else
  56                 est_delay = subs->last_delay + est_delay;
  57
  58         if (est_delay < 0)
  59                 est_delay = 0;
  60         return est_delay;
  61 }
  62
  63 /*
  64  * return the current pcm pointer.  just based on the hwptr_done value.
  65  */
  66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  67 {
  68         struct snd_usb_substream *subs = substream->runtime->private_data;
  69         unsigned int hwptr_done;
  70
  71         if (atomic_read(&subs->stream->chip->shutdown))
  72                 return SNDRV_PCM_POS_XRUN;
  73         spin_lock(&subs->lock);
  74         hwptr_done = subs->hwptr_done;
  75         substream->runtime->delay = snd_usb_pcm_delay(subs,
  76                                                 substream->runtime->rate);
  77         spin_unlock(&subs->lock);
  78         return hwptr_done / (substream->runtime->frame_bits >> 3);
  79 }
  80
  81 /*
  82  * find a matching audio format
  83  */
  84 static struct audioformat *find_format(struct snd_usb_substream *subs)
  85 {
  86         struct audioformat *fp;
  87         struct audioformat *found = NULL;
  88         int cur_attr = 0, attr;
  89
  90         list_for_each_entry(fp, &subs->fmt_list, list) {
  91                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
  92                         continue;
  93                 if (fp->channels != subs->channels)
  94                         continue;
  95                 if (subs->cur_rate < fp->rate_min ||
  96                     subs->cur_rate > fp->rate_max)
  97                         continue;
  98                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  99                         unsigned int i;
 100                         for (i = 0; i < fp->nr_rates; i++)
 101                                 if (fp->rate_table[i] == subs->cur_rate)
 102                                         break;
 103                         if (i >= fp->nr_rates)
 104                                 continue;
 105                 }
 106                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 107                 if (! found) {
 108                         found = fp;
 109                         cur_attr = attr;
 110                         continue;
 111                 }
 112                 /* avoid async out and adaptive in if the other method
 113                  * supports the same format.
 114                  * this is a workaround for the case like
 115                  * M-audio audiophile USB.
 116                  */
 117                 if (attr != cur_attr) {
 118                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 119                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 120                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 121                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 122                                 continue;
 123                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 127                                 found = fp;
 128                                 cur_attr = attr;
 129                                 continue;
 130                         }
 131                 }
 132                 /* find the format with the largest max. packet size */
 133                 if (fp->maxpacksize > found->maxpacksize) {
 134                         found = fp;
 135                         cur_attr = attr;
 136                 }
 137         }
 138         return found;
 139 }
 140
 141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 142                          struct usb_host_interface *alts,
 143                          struct audioformat *fmt)
 144 {
 145         struct usb_device *dev = chip->dev;
 146         unsigned int ep;
 147         unsigned char data[1];
 148         int err;
 149
 150         if (get_iface_desc(alts)->bNumEndpoints < 1)
 151                 return -EINVAL;
 152         ep = get_endpoint(alts, 0)->bEndpointAddress;
 153
 154         data[0] = 1;
 155         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 156                               USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 157                               UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 158                               data, sizeof(data));
 159         if (err < 0) {
 160                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 161                               iface, ep);
 162                 return err;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 169                          struct usb_host_interface *alts,
 170                          struct audioformat *fmt)
 171 {
 172         struct usb_device *dev = chip->dev;
 173         unsigned char data[1];
 174         int err;
 175
 176         data[0] = 1;
 177         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 178                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 179                               UAC2_EP_CS_PITCH << 8, 0,
 180                               data, sizeof(data));
 181         if (err < 0) {
 182                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 183                               iface, fmt->altsetting);
 184                 return err;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /*
 191  * initialize the pitch control and sample rate
 192  */
 193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 194                        struct usb_host_interface *alts,
 195                        struct audioformat *fmt)
 196 {
 197         /* if endpoint doesn't have pitch control, bail out */
 198         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199                 return 0;
 200
 201         switch (fmt->protocol) {
 202         case UAC_VERSION_1:
 203         default:
 204                 return init_pitch_v1(chip, iface, alts, fmt);
 205
 206         case UAC_VERSION_2:
 207                 return init_pitch_v2(chip, iface, alts, fmt);
 208         }
 209 }
 210
 211 static int start_endpoints(struct snd_usb_substream *subs)
 212 {
 213         int err;
 214
 215         if (!subs->data_endpoint)
 216                 return -EINVAL;
 217
 218         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 219                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 220
 221                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 222
 223                 ep->data_subs = subs;
 224                 err = snd_usb_endpoint_start(ep);
 225                 if (err < 0) {
 226                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 227                         return err;
 228                 }
 229         }
 230
 231         if (subs->sync_endpoint &&
 232             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 233                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 234
 235                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 236                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 237                         err = usb_set_interface(subs->dev,
 238                                                 subs->sync_endpoint->iface,
 239                                                 subs->sync_endpoint->altsetting);
 240                         if (err < 0) {
 241                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 242                                 dev_err(&subs->dev->dev,
 243                                            "%d:%d: cannot set interface (%d)\n",
 244                                            subs->sync_endpoint->iface,
 245                                            subs->sync_endpoint->altsetting, err);
 246                                 return -EIO;
 247                         }
 248                 }
 249
 250                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 251
 252                 ep->sync_slave = subs->data_endpoint;
 253                 err = snd_usb_endpoint_start(ep);
 254                 if (err < 0) {
 255                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 256                         return err;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 static void sync_pending_stops(struct snd_usb_substream *subs)
 264 {
 265         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 266         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 267 }
 268
 269 static void stop_endpoints(struct snd_usb_substream *subs)
 270 {
 271         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 272                 snd_usb_endpoint_stop(subs->sync_endpoint);
 273
 274         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 275                 snd_usb_endpoint_stop(subs->data_endpoint);
 276 }
 277
 278 /* PCM sync_stop callback */
 279 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 280 {
 281         struct snd_usb_substream *subs = substream->runtime->private_data;
 282
 283         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 284                 sync_pending_stops(subs);
 285                 snd_usb_unlock_shutdown(subs->stream->chip);
 286         }
 287         return 0;
 288 }
 289
 290 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 291                                      unsigned int altsetting,
 292                                      struct usb_host_interface **alts,
 293                                      unsigned int *ep)
 294 {
 295         struct usb_interface *iface;
 296         struct usb_interface_descriptor *altsd;
 297         struct usb_endpoint_descriptor *epd;
 298
 299         iface = usb_ifnum_to_if(dev, ifnum);
 300         if (!iface || iface->num_altsetting < altsetting + 1)
 301                 return -ENOENT;
 302         *alts = &iface->altsetting[altsetting];
 303         altsd = get_iface_desc(*alts);
 304         if (altsd->bAlternateSetting != altsetting ||
 305             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 306             (altsd->bInterfaceSubClass != 2 &&
 307              altsd->bInterfaceProtocol != 2   ) ||
 308             altsd->bNumEndpoints < 1)
 309                 return -ENOENT;
 310         epd = get_endpoint(*alts, 0);
 311         if (!usb_endpoint_is_isoc_in(epd) ||
 312             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 313                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 314                 return -ENOENT;
 315         *ep = epd->bEndpointAddress;
 316         return 0;
 317 }
 318
 319 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 320  * applies. Returns 1 if a quirk was found.
 321  */
 322 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 323                                          struct usb_device *dev,
 324                                          struct usb_interface_descriptor *altsd,
 325                                          unsigned int attr)
 326 {
 327         struct usb_host_interface *alts;
 328         struct usb_interface *iface;
 329         unsigned int ep;
 330         unsigned int ifnum;
 331
 332         /* Implicit feedback sync EPs consumers are always playback EPs */
 333         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 334                 return 0;
 335
 336         switch (subs->stream->chip->usb_id) {
 337         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 338         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 339                 ep = 0x81;
 340                 ifnum = 3;
 341                 goto add_sync_ep_from_ifnum;
 342         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 343         case USB_ID(0x0763, 0x2081):
 344                 ep = 0x81;
 345                 ifnum = 2;
 346                 goto add_sync_ep_from_ifnum;
 347         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 348                 ep = 0x86;
 349                 ifnum = 2;
 350                 goto add_sync_ep_from_ifnum;
 351         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 352                 ep = 0x81;
 353                 ifnum = 2;
 354                 goto add_sync_ep_from_ifnum;
 355         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 356         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 357                 ep = 0x81;
 358                 ifnum = 1;
 359                 goto add_sync_ep_from_ifnum;
 360         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
 361                 /* MicroBook IIc */
 362                 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
 363                         return 0;
 364
 365                 /* MicroBook II */
 366                 ep = 0x84;
 367                 ifnum = 0;
 368                 goto add_sync_ep_from_ifnum;
 369         case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
 370                 ep = 0x81;
 371                 ifnum = 2;
 372                 goto add_sync_ep_from_ifnum;
 373         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 374                 /* BOSS Katana amplifiers do not need quirks */
 375                 return 0;
 376         }
 377
 378         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 379             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 380             altsd->bInterfaceProtocol == 2 &&
 381             altsd->bNumEndpoints == 1 &&
 382             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 383             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 384                                       altsd->bAlternateSetting,
 385                                       &alts, &ep) >= 0) {
 386                 goto add_sync_ep;
 387         }
 388
 389         /* No quirk */
 390         return 0;
 391
 392 add_sync_ep_from_ifnum:
 393         iface = usb_ifnum_to_if(dev, ifnum);
 394
 395         if (!iface || iface->num_altsetting < 2)
 396                 return -EINVAL;
 397
 398         alts = &iface->altsetting[1];
 399
 400 add_sync_ep:
 401         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 402                                                    alts, ep, !subs->direction,
 403                                                    SND_USB_ENDPOINT_TYPE_DATA);
 404         if (!subs->sync_endpoint)
 405                 return -EINVAL;
 406
 407         subs->data_endpoint->sync_master = subs->sync_endpoint;
 408
 409         return 1;
 410 }
 411
 412 static int set_sync_endpoint(struct snd_usb_substream *subs,
 413                              struct audioformat *fmt,
 414                              struct usb_device *dev,
 415                              struct usb_host_interface *alts,
 416                              struct usb_interface_descriptor *altsd)
 417 {
 418         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 419         unsigned int ep, attr;
 420         bool implicit_fb;
 421         int err;
 422
 423         /* we need a sync pipe in async OUT or adaptive IN mode */
 424         /* check the number of EP, since some devices have broken
 425          * descriptors which fool us.  if it has only one EP,
 426          * assume it as adaptive-out or sync-in.
 427          */
 428         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 429
 430         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 431                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 432
 433                 /*
 434                  * In these modes the notion of sync_endpoint is irrelevant.
 435                  * Reset pointers to avoid using stale data from previously
 436                  * used settings, e.g. when configuration and endpoints were
 437                  * changed
 438                  */
 439
 440                 subs->sync_endpoint = NULL;
 441                 subs->data_endpoint->sync_master = NULL;
 442         }
 443
 444         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 445         if (err < 0)
 446                 return err;
 447
 448         /* endpoint set by quirk */
 449         if (err > 0)
 450                 return 0;
 451
 452         if (altsd->bNumEndpoints < 2)
 453                 return 0;
 454
 455         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 456                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 457             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 458                 return 0;
 459
 460         /*
 461          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 462          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 463          * error fall back to SYNC mode and don't create sync endpoint
 464          */
 465
 466         /* check sync-pipe endpoint */
 467         /* ... and check descriptor size before accessing bSynchAddress
 468            because there is a version of the SB Audigy 2 NX firmware lacking
 469            the audio fields in the endpoint descriptors */
 470         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 471             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 472              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 473                 dev_err(&dev->dev,
 474                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 475                            fmt->iface, fmt->altsetting,
 476                            get_endpoint(alts, 1)->bmAttributes,
 477                            get_endpoint(alts, 1)->bLength,
 478                            get_endpoint(alts, 1)->bSynchAddress);
 479                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 480                         return 0;
 481                 return -EINVAL;
 482         }
 483         ep = get_endpoint(alts, 1)->bEndpointAddress;
 484         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 485             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 486             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 487              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 488                 dev_err(&dev->dev,
 489                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 490                            fmt->iface, fmt->altsetting,
 491                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 492                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 493                         return 0;
 494                 return -EINVAL;
 495         }
 496
 497         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 498                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 499
 500         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 501                                                    alts, ep, !subs->direction,
 502                                                    implicit_fb ?
 503                                                         SND_USB_ENDPOINT_TYPE_DATA :
 504                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 505         if (!subs->sync_endpoint) {
 506                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 507                         return 0;
 508                 return -EINVAL;
 509         }
 510
 511         subs->data_endpoint->sync_master = subs->sync_endpoint;
 512
 513         return 0;
 514 }
 515
 516 /*
 517  * find a matching format and set up the interface
 518  */
 519 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 520 {
 521         struct usb_device *dev = subs->dev;
 522         struct usb_host_interface *alts;
 523         struct usb_interface_descriptor *altsd;
 524         struct usb_interface *iface;
 525         int err;
 526
 527         iface = usb_ifnum_to_if(dev, fmt->iface);
 528         if (WARN_ON(!iface))
 529                 return -EINVAL;
 530         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 531         if (WARN_ON(!alts))
 532                 return -EINVAL;
 533         altsd = get_iface_desc(alts);
 534
 535         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 536                 return 0;
 537
 538         /* close the old interface */
 539         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 540                 if (!subs->stream->chip->keep_iface) {
 541                         err = usb_set_interface(subs->dev, subs->interface, 0);
 542                         if (err < 0) {
 543                                 dev_err(&dev->dev,
 544                                         "%d:%d: return to setting 0 failed (%d)\n",
 545                                         fmt->iface, fmt->altsetting, err);
 546                                 return -EIO;
 547                         }
 548                 }
 549                 subs->interface = -1;
 550                 subs->altset_idx = 0;
 551         }
 552
 553         if (subs->need_setup_fmt)
 554                 subs->need_setup_fmt = false;
 555
 556         /* set interface */
 557         if (iface->cur_altsetting != alts) {
 558                 err = snd_usb_select_mode_quirk(subs, fmt);
 559                 if (err < 0)
 560                         return -EIO;
 561
 562                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 563                 if (err < 0) {
 564                         dev_err(&dev->dev,
 565                                 "%d:%d: usb_set_interface failed (%d)\n",
 566                                 fmt->iface, fmt->altsetting, err);
 567                         return -EIO;
 568                 }
 569                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 570                         fmt->iface, fmt->altsetting);
 571                 snd_usb_set_interface_quirk(dev);
 572         }
 573
 574         subs->interface = fmt->iface;
 575         subs->altset_idx = fmt->altset_idx;
 576         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 577                                                    alts, fmt->endpoint, subs->direction,
 578                                                    SND_USB_ENDPOINT_TYPE_DATA);
 579
 580         if (!subs->data_endpoint)
 581                 return -EINVAL;
 582
 583         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 584         if (err < 0)
 585                 return err;
 586
 587         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 588         if (err < 0)
 589                 return err;
 590
 591         subs->cur_audiofmt = fmt;
 592
 593         snd_usb_set_format_quirk(subs, fmt);
 594
 595         return 0;
 596 }
 597
 598 /*
 599  * Return the score of matching two audioformats.
 600  * Veto the audioformat if:
 601  * - It has no channels for some reason.
 602  * - Requested PCM format is not supported.
 603  * - Requested sample rate is not supported.
 604  */
 605 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 606                                        struct audioformat *fp,
 607                                        struct audioformat *match, int rate,
 608                                        snd_pcm_format_t pcm_format)
 609 {
 610         int i;
 611         int score = 0;
 612
 613         if (fp->channels < 1) {
 614                 dev_dbg(&subs->dev->dev,
 615                         "%s: (fmt @%p) no channels\n", __func__, fp);
 616                 return 0;
 617         }
 618
 619         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 620                 dev_dbg(&subs->dev->dev,
 621                         "%s: (fmt @%p) no match for format %d\n", __func__,
 622                         fp, pcm_format);
 623                 return 0;
 624         }
 625
 626         for (i = 0; i < fp->nr_rates; i++) {
 627                 if (fp->rate_table[i] == rate) {
 628                         score++;
 629                         break;
 630                 }
 631         }
 632         if (!score) {
 633                 dev_dbg(&subs->dev->dev,
 634                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 635                         fp, rate);
 636                 return 0;
 637         }
 638
 639         if (fp->channels == match->channels)
 640                 score++;
 641
 642         dev_dbg(&subs->dev->dev,
 643                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 644
 645         return score;
 646 }
 647
 648 /*
 649  * Configure the sync ep using the rate and pcm format of the data ep.
 650  */
 651 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 652 {
 653         int ret;
 654         struct audioformat *fp;
 655         struct audioformat *sync_fp = NULL;
 656         int cur_score = 0;
 657         int sync_period_bytes = subs->period_bytes;
 658         struct snd_usb_substream *sync_subs =
 659                 &subs->stream->substream[subs->direction ^ 1];
 660
 661         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 662             !subs->stream)
 663                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 664                                                    subs->pcm_format,
 665                                                    subs->channels,
 666                                                    subs->period_bytes,
 667                                                    0, 0,
 668                                                    subs->cur_rate,
 669                                                    subs->cur_audiofmt,
 670                                                    NULL);
 671
 672         /* Try to find the best matching audioformat. */
 673         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 674                 int score = match_endpoint_audioformats(subs,
 675                                                         fp, subs->cur_audiofmt,
 676                         subs->cur_rate, subs->pcm_format);
 677
 678                 if (score > cur_score) {
 679                         sync_fp = fp;
 680                         cur_score = score;
 681                 }
 682         }
 683
 684         if (unlikely(sync_fp == NULL)) {
 685                 dev_err(&subs->dev->dev,
 686                         "%s: no valid audioformat for sync ep %x found\n",
 687                         __func__, sync_subs->ep_num);
 688                 return -EINVAL;
 689         }
 690
 691         /*
 692          * Recalculate the period bytes if channel number differ between
 693          * data and sync ep audioformat.
 694          */
 695         if (sync_fp->channels != subs->channels) {
 696                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 697                         sync_fp->channels;
 698                 dev_dbg(&subs->dev->dev,
 699                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 700                         __func__, subs->period_bytes, sync_period_bytes);
 701         }
 702
 703         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 704                                           subs->pcm_format,
 705                                           sync_fp->channels,
 706                                           sync_period_bytes,
 707                                           0, 0,
 708                                           subs->cur_rate,
 709                                           sync_fp,
 710                                           NULL);
 711
 712         return ret;
 713 }
 714
 715 /*
 716  * configure endpoint params
 717  *
 718  * called  during initial setup and upon resume
 719  */
 720 static int configure_endpoint(struct snd_usb_substream *subs)
 721 {
 722         int ret;
 723
 724         /* format changed */
 725         stop_endpoints(subs);
 726         sync_pending_stops(subs);
 727         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 728                                           subs->pcm_format,
 729                                           subs->channels,
 730                                           subs->period_bytes,
 731                                           subs->period_frames,
 732                                           subs->buffer_periods,
 733                                           subs->cur_rate,
 734                                           subs->cur_audiofmt,
 735                                           subs->sync_endpoint);
 736         if (ret < 0)
 737                 return ret;
 738
 739         if (subs->sync_endpoint)
 740                 ret = configure_sync_endpoint(subs);
 741
 742         return ret;
 743 }
 744
 745 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 746 {
 747         int ret;
 748
 749         if (!subs->str_pd)
 750                 return 0;
 751
 752         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 753         if (ret < 0) {
 754                 dev_err(&subs->dev->dev,
 755                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 756                         subs->str_pd->pd_id, state, ret);
 757                 return ret;
 758         }
 759
 760         return 0;
 761 }
 762
 763 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 764 {
 765         int ret;
 766
 767         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 768         if (ret < 0)
 769                 return ret;
 770
 771         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 772         if (ret < 0)
 773                 return ret;
 774
 775         return 0;
 776 }
 777
 778 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 779 {
 780         int ret;
 781
 782         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 783         if (ret < 0)
 784                 return ret;
 785
 786         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 787         if (ret < 0)
 788                 return ret;
 789
 790         return 0;
 791 }
 792
 793 /*
 794  * hw_params callback
 795  *
 796  * allocate a buffer and set the given audio format.
 797  *
 798  * so far we use a physically linear buffer although packetize transfer
 799  * doesn't need a continuous area.
 800  * if sg buffer is supported on the later version of alsa, we'll follow
 801  * that.
 802  */
 803 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 804                              struct snd_pcm_hw_params *hw_params)
 805 {
 806         struct snd_usb_substream *subs = substream->runtime->private_data;
 807         struct audioformat *fmt;
 808         int ret;
 809
 810         ret = snd_media_start_pipeline(subs);
 811         if (ret)
 812                 return ret;
 813
 814         subs->pcm_format = params_format(hw_params);
 815         subs->period_bytes = params_period_bytes(hw_params);
 816         subs->period_frames = params_period_size(hw_params);
 817         subs->buffer_periods = params_periods(hw_params);
 818         subs->channels = params_channels(hw_params);
 819         subs->cur_rate = params_rate(hw_params);
 820
 821         fmt = find_format(subs);
 822         if (!fmt) {
 823                 dev_dbg(&subs->dev->dev,
 824                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 825                            subs->pcm_format, subs->cur_rate, subs->channels);
 826                 ret = -EINVAL;
 827                 goto stop_pipeline;
 828         }
 829
 830         ret = snd_usb_lock_shutdown(subs->stream->chip);
 831         if (ret < 0)
 832                 goto stop_pipeline;
 833
 834         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 835         if (ret < 0)
 836                 goto unlock;
 837
 838         ret = set_format(subs, fmt);
 839         if (ret < 0)
 840                 goto unlock;
 841
 842         subs->interface = fmt->iface;
 843         subs->altset_idx = fmt->altset_idx;
 844         subs->need_setup_ep = true;
 845
 846  unlock:
 847         snd_usb_unlock_shutdown(subs->stream->chip);
 848         if (ret < 0)
 849                 goto stop_pipeline;
 850         return ret;
 851
 852  stop_pipeline:
 853         snd_media_stop_pipeline(subs);
 854         return ret;
 855 }
 856
 857 /*
 858  * hw_free callback
 859  *
 860  * reset the audio format and release the buffer
 861  */
 862 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 863 {
 864         struct snd_usb_substream *subs = substream->runtime->private_data;
 865
 866         snd_media_stop_pipeline(subs);
 867         subs->cur_audiofmt = NULL;
 868         subs->cur_rate = 0;
 869         subs->period_bytes = 0;
 870         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 871                 stop_endpoints(subs);
 872                 sync_pending_stops(subs);
 873                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 874                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 875                 snd_usb_unlock_shutdown(subs->stream->chip);
 876         }
 877
 878         return 0;
 879 }
 880
 881 /*
 882  * prepare callback
 883  *
 884  * only a few subtle things...
 885  */
 886 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 887 {
 888         struct snd_pcm_runtime *runtime = substream->runtime;
 889         struct snd_usb_substream *subs = runtime->private_data;
 890         struct usb_host_interface *alts;
 891         struct usb_interface *iface;
 892         int ret;
 893
 894         if (! subs->cur_audiofmt) {
 895                 dev_err(&subs->dev->dev, "no format is specified!\n");
 896                 return -ENXIO;
 897         }
 898
 899         ret = snd_usb_lock_shutdown(subs->stream->chip);
 900         if (ret < 0)
 901                 return ret;
 902         if (snd_BUG_ON(!subs->data_endpoint)) {
 903                 ret = -EIO;
 904                 goto unlock;
 905         }
 906
 907         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 908         if (ret < 0)
 909                 goto unlock;
 910
 911         ret = set_format(subs, subs->cur_audiofmt);
 912         if (ret < 0)
 913                 goto unlock;
 914
 915         if (subs->need_setup_ep) {
 916
 917                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 918                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 919                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 920                                                subs->cur_audiofmt->iface,
 921                                                alts,
 922                                                subs->cur_audiofmt,
 923                                                subs->cur_rate);
 924                 if (ret < 0)
 925                         goto unlock;
 926
 927                 ret = configure_endpoint(subs);
 928                 if (ret < 0)
 929                         goto unlock;
 930                 subs->need_setup_ep = false;
 931         }
 932
 933         /* some unit conversions in runtime */
 934         subs->data_endpoint->maxframesize =
 935                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 936         subs->data_endpoint->curframesize =
 937                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 938
 939         /* reset the pointer */
 940         subs->hwptr_done = 0;
 941         subs->transfer_done = 0;
 942         subs->last_delay = 0;
 943         subs->last_frame_number = 0;
 944         runtime->delay = 0;
 945
 946         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 947          * updates for all URBs would happen at the same time when starting */
 948         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 949                 ret = start_endpoints(subs);
 950
 951  unlock:
 952         snd_usb_unlock_shutdown(subs->stream->chip);
 953         return ret;
 954 }
 955
 956 static const struct snd_pcm_hardware snd_usb_hardware =
 957 {
 958         .info =                 SNDRV_PCM_INFO_MMAP |
 959                                 SNDRV_PCM_INFO_MMAP_VALID |
 960                                 SNDRV_PCM_INFO_BATCH |
 961                                 SNDRV_PCM_INFO_INTERLEAVED |
 962                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 963                                 SNDRV_PCM_INFO_PAUSE,
 964         .buffer_bytes_max =     1024 * 1024,
 965         .period_bytes_min =     64,
 966         .period_bytes_max =     512 * 1024,
 967         .periods_min =          2,
 968         .periods_max =          1024,
 969 };
 970
 971 static int hw_check_valid_format(struct snd_usb_substream *subs,
 972                                  struct snd_pcm_hw_params *params,
 973                                  struct audioformat *fp)
 974 {
 975         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 976         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 977         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 978         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 979         struct snd_mask check_fmts;
 980         unsigned int ptime;
 981
 982         /* check the format */
 983         snd_mask_none(&check_fmts);
 984         check_fmts.bits[0] = (u32)fp->formats;
 985         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 986         snd_mask_intersect(&check_fmts, fmts);
 987         if (snd_mask_empty(&check_fmts)) {
 988                 hwc_debug("   > check: no supported format %d\n", fp->format);
 989                 return 0;
 990         }
 991         /* check the channels */
 992         if (fp->channels < ct->min || fp->channels > ct->max) {
 993                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 994                 return 0;
 995         }
 996         /* check the rate is within the range */
 997         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 998                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 999                 return 0;
1000         }
1001         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1002                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1003                 return 0;
1004         }
1005         /* check whether the period time is >= the data packet interval */
1006         if (subs->speed != USB_SPEED_FULL) {
1007                 ptime = 125 * (1 << fp->datainterval);
1008                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1009                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1010                         return 0;
1011                 }
1012         }
1013         return 1;
1014 }
1015
1016 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1017                         struct snd_pcm_hw_rule *rule)
1018 {
1019         struct snd_usb_substream *subs = rule->private;
1020         struct audioformat *fp;
1021         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1022         unsigned int rmin, rmax;
1023         int changed;
1024
1025         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1026         changed = 0;
1027         rmin = rmax = 0;
1028         list_for_each_entry(fp, &subs->fmt_list, list) {
1029                 if (!hw_check_valid_format(subs, params, fp))
1030                         continue;
1031                 if (changed++) {
1032                         if (rmin > fp->rate_min)
1033                                 rmin = fp->rate_min;
1034                         if (rmax < fp->rate_max)
1035                                 rmax = fp->rate_max;
1036                 } else {
1037                         rmin = fp->rate_min;
1038                         rmax = fp->rate_max;
1039                 }
1040         }
1041
1042         if (!changed) {
1043                 hwc_debug("  --> get empty\n");
1044                 it->empty = 1;
1045                 return -EINVAL;
1046         }
1047
1048         changed = 0;
1049         if (it->min < rmin) {
1050                 it->min = rmin;
1051                 it->openmin = 0;
1052                 changed = 1;
1053         }
1054         if (it->max > rmax) {
1055                 it->max = rmax;
1056                 it->openmax = 0;
1057                 changed = 1;
1058         }
1059         if (snd_interval_checkempty(it)) {
1060                 it->empty = 1;
1061                 return -EINVAL;
1062         }
1063         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1064         return changed;
1065 }
1066
1067
1068 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1069                             struct snd_pcm_hw_rule *rule)
1070 {
1071         struct snd_usb_substream *subs = rule->private;
1072         struct audioformat *fp;
1073         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1074         unsigned int rmin, rmax;
1075         int changed;
1076
1077         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1078         changed = 0;
1079         rmin = rmax = 0;
1080         list_for_each_entry(fp, &subs->fmt_list, list) {
1081                 if (!hw_check_valid_format(subs, params, fp))
1082                         continue;
1083                 if (changed++) {
1084                         if (rmin > fp->channels)
1085                                 rmin = fp->channels;
1086                         if (rmax < fp->channels)
1087                                 rmax = fp->channels;
1088                 } else {
1089                         rmin = fp->channels;
1090                         rmax = fp->channels;
1091                 }
1092         }
1093
1094         if (!changed) {
1095                 hwc_debug("  --> get empty\n");
1096                 it->empty = 1;
1097                 return -EINVAL;
1098         }
1099
1100         changed = 0;
1101         if (it->min < rmin) {
1102                 it->min = rmin;
1103                 it->openmin = 0;
1104                 changed = 1;
1105         }
1106         if (it->max > rmax) {
1107                 it->max = rmax;
1108                 it->openmax = 0;
1109                 changed = 1;
1110         }
1111         if (snd_interval_checkempty(it)) {
1112                 it->empty = 1;
1113                 return -EINVAL;
1114         }
1115         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1116         return changed;
1117 }
1118
1119 static int hw_rule_format(struct snd_pcm_hw_params *params,
1120                           struct snd_pcm_hw_rule *rule)
1121 {
1122         struct snd_usb_substream *subs = rule->private;
1123         struct audioformat *fp;
1124         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1125         u64 fbits;
1126         u32 oldbits[2];
1127         int changed;
1128
1129         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1130         fbits = 0;
1131         list_for_each_entry(fp, &subs->fmt_list, list) {
1132                 if (!hw_check_valid_format(subs, params, fp))
1133                         continue;
1134                 fbits |= fp->formats;
1135         }
1136
1137         oldbits[0] = fmt->bits[0];
1138         oldbits[1] = fmt->bits[1];
1139         fmt->bits[0] &= (u32)fbits;
1140         fmt->bits[1] &= (u32)(fbits >> 32);
1141         if (!fmt->bits[0] && !fmt->bits[1]) {
1142                 hwc_debug("  --> get empty\n");
1143                 return -EINVAL;
1144         }
1145         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1146         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1147         return changed;
1148 }
1149
1150 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1151                                struct snd_pcm_hw_rule *rule)
1152 {
1153         struct snd_usb_substream *subs = rule->private;
1154         struct audioformat *fp;
1155         struct snd_interval *it;
1156         unsigned char min_datainterval;
1157         unsigned int pmin;
1158         int changed;
1159
1160         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1161         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1162         min_datainterval = 0xff;
1163         list_for_each_entry(fp, &subs->fmt_list, list) {
1164                 if (!hw_check_valid_format(subs, params, fp))
1165                         continue;
1166                 min_datainterval = min(min_datainterval, fp->datainterval);
1167         }
1168         if (min_datainterval == 0xff) {
1169                 hwc_debug("  --> get empty\n");
1170                 it->empty = 1;
1171                 return -EINVAL;
1172         }
1173         pmin = 125 * (1 << min_datainterval);
1174         changed = 0;
1175         if (it->min < pmin) {
1176                 it->min = pmin;
1177                 it->openmin = 0;
1178                 changed = 1;
1179         }
1180         if (snd_interval_checkempty(it)) {
1181                 it->empty = 1;
1182                 return -EINVAL;
1183         }
1184         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1185         return changed;
1186 }
1187
1188 /*
1189  *  If the device supports unusual bit rates, does the request meet these?
1190  */
1191 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1192                                   struct snd_usb_substream *subs)
1193 {
1194         struct audioformat *fp;
1195         int *rate_list;
1196         int count = 0, needs_knot = 0;
1197         int err;
1198
1199         kfree(subs->rate_list.list);
1200         subs->rate_list.list = NULL;
1201
1202         list_for_each_entry(fp, &subs->fmt_list, list) {
1203                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1204                         return 0;
1205                 count += fp->nr_rates;
1206                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1207                         needs_knot = 1;
1208         }
1209         if (!needs_knot)
1210                 return 0;
1211
1212         subs->rate_list.list = rate_list =
1213                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1214         if (!subs->rate_list.list)
1215                 return -ENOMEM;
1216         subs->rate_list.count = count;
1217         subs->rate_list.mask = 0;
1218         count = 0;
1219         list_for_each_entry(fp, &subs->fmt_list, list) {
1220                 int i;
1221                 for (i = 0; i < fp->nr_rates; i++)
1222                         rate_list[count++] = fp->rate_table[i];
1223         }
1224         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1225                                          &subs->rate_list);
1226         if (err < 0)
1227                 return err;
1228
1229         return 0;
1230 }
1231
1232
1233 /*
1234  * set up the runtime hardware information.
1235  */
1236
1237 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1238 {
1239         struct audioformat *fp;
1240         unsigned int pt, ptmin;
1241         int param_period_time_if_needed;
1242         int err;
1243
1244         runtime->hw.formats = subs->formats;
1245
1246         runtime->hw.rate_min = 0x7fffffff;
1247         runtime->hw.rate_max = 0;
1248         runtime->hw.channels_min = 256;
1249         runtime->hw.channels_max = 0;
1250         runtime->hw.rates = 0;
1251         ptmin = UINT_MAX;
1252         /* check min/max rates and channels */
1253         list_for_each_entry(fp, &subs->fmt_list, list) {
1254                 runtime->hw.rates |= fp->rates;
1255                 if (runtime->hw.rate_min > fp->rate_min)
1256                         runtime->hw.rate_min = fp->rate_min;
1257                 if (runtime->hw.rate_max < fp->rate_max)
1258                         runtime->hw.rate_max = fp->rate_max;
1259                 if (runtime->hw.channels_min > fp->channels)
1260                         runtime->hw.channels_min = fp->channels;
1261                 if (runtime->hw.channels_max < fp->channels)
1262                         runtime->hw.channels_max = fp->channels;
1263                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1264                         /* FIXME: there might be more than one audio formats... */
1265                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1266                                 fp->frame_size;
1267                 }
1268                 pt = 125 * (1 << fp->datainterval);
1269                 ptmin = min(ptmin, pt);
1270         }
1271
1272         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1273         if (subs->speed == USB_SPEED_FULL)
1274                 /* full speed devices have fixed data packet interval */
1275                 ptmin = 1000;
1276         if (ptmin == 1000)
1277                 /* if period time doesn't go below 1 ms, no rules needed */
1278                 param_period_time_if_needed = -1;
1279
1280         err = snd_pcm_hw_constraint_minmax(runtime,
1281                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1282                                            ptmin, UINT_MAX);
1283         if (err < 0)
1284                 return err;
1285
1286         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1287                                   hw_rule_rate, subs,
1288                                   SNDRV_PCM_HW_PARAM_FORMAT,
1289                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1290                                   param_period_time_if_needed,
1291                                   -1);
1292         if (err < 0)
1293                 return err;
1294         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1295                                   hw_rule_channels, subs,
1296                                   SNDRV_PCM_HW_PARAM_FORMAT,
1297                                   SNDRV_PCM_HW_PARAM_RATE,
1298                                   param_period_time_if_needed,
1299                                   -1);
1300         if (err < 0)
1301                 return err;
1302         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1303                                   hw_rule_format, subs,
1304                                   SNDRV_PCM_HW_PARAM_RATE,
1305                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1306                                   param_period_time_if_needed,
1307                                   -1);
1308         if (err < 0)
1309                 return err;
1310         if (param_period_time_if_needed >= 0) {
1311                 err = snd_pcm_hw_rule_add(runtime, 0,
1312                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1313                                           hw_rule_period_time, subs,
1314                                           SNDRV_PCM_HW_PARAM_FORMAT,
1315                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1316                                           SNDRV_PCM_HW_PARAM_RATE,
1317                                           -1);
1318                 if (err < 0)
1319                         return err;
1320         }
1321         err = snd_usb_pcm_check_knot(runtime, subs);
1322         if (err < 0)
1323                 return err;
1324
1325         return snd_usb_autoresume(subs->stream->chip);
1326 }
1327
1328 static int snd_usb_pcm_open(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_pcm_runtime *runtime = substream->runtime;
1333         struct snd_usb_substream *subs = &as->substream[direction];
1334         int ret;
1335
1336         subs->interface = -1;
1337         subs->altset_idx = 0;
1338         runtime->hw = snd_usb_hardware;
1339         runtime->private_data = subs;
1340         subs->pcm_substream = substream;
1341         /* runtime PM is also done there */
1342
1343         /* initialize DSD/DOP context */
1344         subs->dsd_dop.byte_idx = 0;
1345         subs->dsd_dop.channel = 0;
1346         subs->dsd_dop.marker = 1;
1347
1348         ret = setup_hw_info(runtime, subs);
1349         if (ret == 0) {
1350                 ret = snd_media_stream_init(subs, as->pcm, direction);
1351                 if (ret)
1352                         snd_usb_autosuspend(subs->stream->chip);
1353         }
1354         return ret;
1355 }
1356
1357 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1358 {
1359         int direction = substream->stream;
1360         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1361         struct snd_usb_substream *subs = &as->substream[direction];
1362         int ret;
1363
1364         snd_media_stop_pipeline(subs);
1365
1366         if (!as->chip->keep_iface &&
1367             subs->interface >= 0 &&
1368             !snd_usb_lock_shutdown(subs->stream->chip)) {
1369                 usb_set_interface(subs->dev, subs->interface, 0);
1370                 subs->interface = -1;
1371                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1372                 snd_usb_unlock_shutdown(subs->stream->chip);
1373                 if (ret < 0)
1374                         return ret;
1375         }
1376
1377         subs->pcm_substream = NULL;
1378         snd_usb_autosuspend(subs->stream->chip);
1379
1380         return 0;
1381 }
1382
1383 /* Since a URB can handle only a single linear buffer, we must use double
1384  * buffering when the data to be transferred overflows the buffer boundary.
1385  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1386  * for all URBs.
1387  */
1388 static void retire_capture_urb(struct snd_usb_substream *subs,
1389                                struct urb *urb)
1390 {
1391         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1392         unsigned int stride, frames, bytes, oldptr;
1393         int i, period_elapsed = 0;
1394         unsigned long flags;
1395         unsigned char *cp;
1396         int current_frame_number;
1397
1398         /* read frame number here, update pointer in critical section */
1399         current_frame_number = usb_get_current_frame_number(subs->dev);
1400
1401         stride = runtime->frame_bits >> 3;
1402
1403         for (i = 0; i < urb->number_of_packets; i++) {
1404                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1405                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1406                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1407                                 i, urb->iso_frame_desc[i].status);
1408                         // continue;
1409                 }
1410                 bytes = urb->iso_frame_desc[i].actual_length;
1411                 frames = bytes / stride;
1412                 if (!subs->txfr_quirk)
1413                         bytes = frames * stride;
1414                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1415                         int oldbytes = bytes;
1416                         bytes = frames * stride;
1417                         dev_warn_ratelimited(&subs->dev->dev,
1418                                  "Corrected urb data len. %d->%d\n",
1419                                                         oldbytes, bytes);
1420                 }
1421                 /* update the current pointer */
1422                 spin_lock_irqsave(&subs->lock, flags);
1423                 oldptr = subs->hwptr_done;
1424                 subs->hwptr_done += bytes;
1425                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1426                         subs->hwptr_done -= runtime->buffer_size * stride;
1427                 frames = (bytes + (oldptr % stride)) / stride;
1428                 subs->transfer_done += frames;
1429                 if (subs->transfer_done >= runtime->period_size) {
1430                         subs->transfer_done -= runtime->period_size;
1431                         period_elapsed = 1;
1432                 }
1433                 /* capture delay is by construction limited to one URB,
1434                  * reset delays here
1435                  */
1436                 runtime->delay = subs->last_delay = 0;
1437
1438                 /* realign last_frame_number */
1439                 subs->last_frame_number = current_frame_number;
1440                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1441
1442                 spin_unlock_irqrestore(&subs->lock, flags);
1443                 /* copy a data chunk */
1444                 if (oldptr + bytes > runtime->buffer_size * stride) {
1445                         unsigned int bytes1 =
1446                                         runtime->buffer_size * stride - oldptr;
1447                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1448                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1449                 } else {
1450                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1451                 }
1452         }
1453
1454         if (period_elapsed)
1455                 snd_pcm_period_elapsed(subs->pcm_substream);
1456 }
1457
1458 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1459                                              struct urb *urb, unsigned int bytes)
1460 {
1461         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1462         unsigned int stride = runtime->frame_bits >> 3;
1463         unsigned int dst_idx = 0;
1464         unsigned int src_idx = subs->hwptr_done;
1465         unsigned int wrap = runtime->buffer_size * stride;
1466         u8 *dst = urb->transfer_buffer;
1467         u8 *src = runtime->dma_area;
1468         u8 marker[] = { 0x05, 0xfa };
1469
1470         /*
1471          * The DSP DOP format defines a way to transport DSD samples over
1472          * normal PCM data endpoints. It requires stuffing of marker bytes
1473          * (0x05 and 0xfa, alternating per sample frame), and then expects
1474          * 2 additional bytes of actual payload. The whole frame is stored
1475          * LSB.
1476          *
1477          * Hence, for a stereo transport, the buffer layout looks like this,
1478          * where L refers to left channel samples and R to right.
1479          *
1480          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1481          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1482          *   .....
1483          *
1484          */
1485
1486         while (bytes--) {
1487                 if (++subs->dsd_dop.byte_idx == 3) {
1488                         /* frame boundary? */
1489                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1490                         src_idx += 2;
1491                         subs->dsd_dop.byte_idx = 0;
1492
1493                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1494                                 /* alternate the marker */
1495                                 subs->dsd_dop.marker++;
1496                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1497                                 subs->dsd_dop.channel = 0;
1498                         }
1499                 } else {
1500                         /* stuff the DSD payload */
1501                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1502
1503                         if (subs->cur_audiofmt->dsd_bitrev)
1504                                 dst[dst_idx++] = bitrev8(src[idx]);
1505                         else
1506                                 dst[dst_idx++] = src[idx];
1507
1508                         subs->hwptr_done++;
1509                 }
1510         }
1511         if (subs->hwptr_done >= runtime->buffer_size * stride)
1512                 subs->hwptr_done -= runtime->buffer_size * stride;
1513 }
1514
1515 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1516                         int offset, int stride, unsigned int bytes)
1517 {
1518         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1519
1520         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1521                 /* err, the transferred area goes over buffer boundary. */
1522                 unsigned int bytes1 =
1523                         runtime->buffer_size * stride - subs->hwptr_done;
1524                 memcpy(urb->transfer_buffer + offset,
1525                        runtime->dma_area + subs->hwptr_done, bytes1);
1526                 memcpy(urb->transfer_buffer + offset + bytes1,
1527                        runtime->dma_area, bytes - bytes1);
1528         } else {
1529                 memcpy(urb->transfer_buffer + offset,
1530                        runtime->dma_area + subs->hwptr_done, bytes);
1531         }
1532         subs->hwptr_done += bytes;
1533         if (subs->hwptr_done >= runtime->buffer_size * stride)
1534                 subs->hwptr_done -= runtime->buffer_size * stride;
1535 }
1536
1537 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1538                                       struct urb *urb, int stride,
1539                                       unsigned int bytes)
1540 {
1541         __le32 packet_length;
1542         int i;
1543
1544         /* Put __le32 length descriptor at start of each packet. */
1545         for (i = 0; i < urb->number_of_packets; i++) {
1546                 unsigned int length = urb->iso_frame_desc[i].length;
1547                 unsigned int offset = urb->iso_frame_desc[i].offset;
1548
1549                 packet_length = cpu_to_le32(length);
1550                 offset += i * sizeof(packet_length);
1551                 urb->iso_frame_desc[i].offset = offset;
1552                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1553                 memcpy(urb->transfer_buffer + offset,
1554                        &packet_length, sizeof(packet_length));
1555                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1556                             stride, length);
1557         }
1558         /* Adjust transfer size accordingly. */
1559         bytes += urb->number_of_packets * sizeof(packet_length);
1560         return bytes;
1561 }
1562
1563 static void prepare_playback_urb(struct snd_usb_substream *subs,
1564                                  struct urb *urb)
1565 {
1566         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1567         struct snd_usb_endpoint *ep = subs->data_endpoint;
1568         struct snd_urb_ctx *ctx = urb->context;
1569         unsigned int counts, frames, bytes;
1570         int i, stride, period_elapsed = 0;
1571         unsigned long flags;
1572
1573         stride = runtime->frame_bits >> 3;
1574
1575         frames = 0;
1576         urb->number_of_packets = 0;
1577         spin_lock_irqsave(&subs->lock, flags);
1578         subs->frame_limit += ep->max_urb_frames;
1579         for (i = 0; i < ctx->packets; i++) {
1580                 if (ctx->packet_size[i])
1581                         counts = ctx->packet_size[i];
1582                 else
1583                         counts = snd_usb_endpoint_next_packet_size(ep);
1584
1585                 /* set up descriptor */
1586                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1587                 urb->iso_frame_desc[i].length = counts * ep->stride;
1588                 frames += counts;
1589                 urb->number_of_packets++;
1590                 subs->transfer_done += counts;
1591                 if (subs->transfer_done >= runtime->period_size) {
1592                         subs->transfer_done -= runtime->period_size;
1593                         subs->frame_limit = 0;
1594                         period_elapsed = 1;
1595                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1596                                 if (subs->transfer_done > 0) {
1597                                         /* FIXME: fill-max mode is not
1598                                          * supported yet */
1599                                         frames -= subs->transfer_done;
1600                                         counts -= subs->transfer_done;
1601                                         urb->iso_frame_desc[i].length =
1602                                                 counts * ep->stride;
1603                                         subs->transfer_done = 0;
1604                                 }
1605                                 i++;
1606                                 if (i < ctx->packets) {
1607                                         /* add a transfer delimiter */
1608                                         urb->iso_frame_desc[i].offset =
1609                                                 frames * ep->stride;
1610                                         urb->iso_frame_desc[i].length = 0;
1611                                         urb->number_of_packets++;
1612                                 }
1613                                 break;
1614                         }
1615                 }
1616                 /* finish at the period boundary or after enough frames */
1617                 if ((period_elapsed ||
1618                                 subs->transfer_done >= subs->frame_limit) &&
1619                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1620                         break;
1621         }
1622         bytes = frames * ep->stride;
1623
1624         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1625                      subs->cur_audiofmt->dsd_dop)) {
1626                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1627         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1628                            subs->cur_audiofmt->dsd_bitrev)) {
1629                 /* bit-reverse the bytes */
1630                 u8 *buf = urb->transfer_buffer;
1631                 for (i = 0; i < bytes; i++) {
1632                         int idx = (subs->hwptr_done + i)
1633                                 % (runtime->buffer_size * stride);
1634                         buf[i] = bitrev8(runtime->dma_area[idx]);
1635                 }
1636
1637                 subs->hwptr_done += bytes;
1638                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1639                         subs->hwptr_done -= runtime->buffer_size * stride;
1640         } else {
1641                 /* usual PCM */
1642                 if (!subs->tx_length_quirk)
1643                         copy_to_urb(subs, urb, 0, stride, bytes);
1644                 else
1645                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1646                         /* bytes is now amount of outgoing data */
1647         }
1648
1649         /* update delay with exact number of samples queued */
1650         runtime->delay = subs->last_delay;
1651         runtime->delay += frames;
1652         subs->last_delay = runtime->delay;
1653
1654         /* realign last_frame_number */
1655         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1656         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1657
1658         if (subs->trigger_tstamp_pending_update) {
1659                 /* this is the first actual URB submitted,
1660                  * update trigger timestamp to reflect actual start time
1661                  */
1662                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1663                 subs->trigger_tstamp_pending_update = false;
1664         }
1665
1666         spin_unlock_irqrestore(&subs->lock, flags);
1667         urb->transfer_buffer_length = bytes;
1668         if (period_elapsed)
1669                 snd_pcm_period_elapsed(subs->pcm_substream);
1670 }
1671
1672 /*
1673  * process after playback data complete
1674  * - decrease the delay count again
1675  */
1676 static void retire_playback_urb(struct snd_usb_substream *subs,
1677                                struct urb *urb)
1678 {
1679         unsigned long flags;
1680         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1681         struct snd_usb_endpoint *ep = subs->data_endpoint;
1682         int processed = urb->transfer_buffer_length / ep->stride;
1683         int est_delay;
1684
1685         /* ignore the delay accounting when procssed=0 is given, i.e.
1686          * silent payloads are procssed before handling the actual data
1687          */
1688         if (!processed)
1689                 return;
1690
1691         spin_lock_irqsave(&subs->lock, flags);
1692         if (!subs->last_delay)
1693                 goto out; /* short path */
1694
1695         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1696         /* update delay with exact number of samples played */
1697         if (processed > subs->last_delay)
1698                 subs->last_delay = 0;
1699         else
1700                 subs->last_delay -= processed;
1701         runtime->delay = subs->last_delay;
1702
1703         /*
1704          * Report when delay estimate is off by more than 2ms.
1705          * The error should be lower than 2ms since the estimate relies
1706          * on two reads of a counter updated every ms.
1707          */
1708         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1709                 dev_dbg_ratelimited(&subs->dev->dev,
1710                         "delay: estimated %d, actual %d\n",
1711                         est_delay, subs->last_delay);
1712
1713         if (!subs->running) {
1714                 /* update last_frame_number for delay counting here since
1715                  * prepare_playback_urb won't be called during pause
1716                  */
1717                 subs->last_frame_number =
1718                         usb_get_current_frame_number(subs->dev) & 0xff;
1719         }
1720
1721  out:
1722         spin_unlock_irqrestore(&subs->lock, flags);
1723 }
1724
1725 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1726                                               int cmd)
1727 {
1728         struct snd_usb_substream *subs = substream->runtime->private_data;
1729
1730         switch (cmd) {
1731         case SNDRV_PCM_TRIGGER_START:
1732                 subs->trigger_tstamp_pending_update = true;
1733                 /* fall through */
1734         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1735                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1736                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1737                 subs->running = 1;
1738                 return 0;
1739         case SNDRV_PCM_TRIGGER_STOP:
1740                 stop_endpoints(subs);
1741                 subs->running = 0;
1742                 return 0;
1743         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1744                 subs->data_endpoint->prepare_data_urb = NULL;
1745                 /* keep retire_data_urb for delay calculation */
1746                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1747                 subs->running = 0;
1748                 return 0;
1749         case SNDRV_PCM_TRIGGER_SUSPEND:
1750                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1751                         stop_endpoints(subs);
1752                         subs->need_setup_fmt = true;
1753                         return 0;
1754                 }
1755                 break;
1756         }
1757
1758         return -EINVAL;
1759 }
1760
1761 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1762                                              int cmd)
1763 {
1764         int err;
1765         struct snd_usb_substream *subs = substream->runtime->private_data;
1766
1767         switch (cmd) {
1768         case SNDRV_PCM_TRIGGER_START:
1769                 err = start_endpoints(subs);
1770                 if (err < 0)
1771                         return err;
1772
1773                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1774                 subs->running = 1;
1775                 return 0;
1776         case SNDRV_PCM_TRIGGER_STOP:
1777                 stop_endpoints(subs);
1778                 subs->running = 0;
1779                 return 0;
1780         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1781                 subs->data_endpoint->retire_data_urb = NULL;
1782                 subs->running = 0;
1783                 return 0;
1784         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1785                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1786                 subs->running = 1;
1787                 return 0;
1788         case SNDRV_PCM_TRIGGER_SUSPEND:
1789                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1790                         stop_endpoints(subs);
1791                         subs->need_setup_fmt = true;
1792                         return 0;
1793                 }
1794                 break;
1795         }
1796
1797         return -EINVAL;
1798 }
1799
1800 static const struct snd_pcm_ops snd_usb_playback_ops = {
1801         .open =         snd_usb_pcm_open,
1802         .close =        snd_usb_pcm_close,
1803         .hw_params =    snd_usb_hw_params,
1804         .hw_free =      snd_usb_hw_free,
1805         .prepare =      snd_usb_pcm_prepare,
1806         .trigger =      snd_usb_substream_playback_trigger,
1807         .sync_stop =    snd_usb_pcm_sync_stop,
1808         .pointer =      snd_usb_pcm_pointer,
1809 };
1810
1811 static const struct snd_pcm_ops snd_usb_capture_ops = {
1812         .open =         snd_usb_pcm_open,
1813         .close =        snd_usb_pcm_close,
1814         .hw_params =    snd_usb_hw_params,
1815         .hw_free =      snd_usb_hw_free,
1816         .prepare =      snd_usb_pcm_prepare,
1817         .trigger =      snd_usb_substream_capture_trigger,
1818         .sync_stop =    snd_usb_pcm_sync_stop,
1819         .pointer =      snd_usb_pcm_pointer,
1820 };
1821
1822 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1823 {
1824         const struct snd_pcm_ops *ops;
1825
1826         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1827                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1828         snd_pcm_set_ops(pcm, stream, ops);
1829 }
1830
1831 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1832 {
1833         struct snd_pcm *pcm = subs->stream->pcm;
1834         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1835         struct device *dev = subs->dev->bus->controller;
1836
1837         if (snd_usb_use_vmalloc)
1838                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1839                                            NULL, 0, 0);
1840         else
1841                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1842                                            dev, 64*1024, 512*1024);
1843 }