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         case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
 371         case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
 372         case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
 373                 ep = 0x81;
 374                 ifnum = 2;
 375                 goto add_sync_ep_from_ifnum;
 376         case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 377                 ep = 0x82;
 378                 ifnum = 0;
 379                 goto add_sync_ep_from_ifnum;
 380         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 381                 /* BOSS Katana amplifiers do not need quirks */
 382                 return 0;
 383         }
 384
 385         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 386             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 387             altsd->bInterfaceProtocol == 2 &&
 388             altsd->bNumEndpoints == 1 &&
 389             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 390             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 391                                       altsd->bAlternateSetting,
 392                                       &alts, &ep) >= 0) {
 393                 goto add_sync_ep;
 394         }
 395
 396         /* No quirk */
 397         return 0;
 398
 399 add_sync_ep_from_ifnum:
 400         iface = usb_ifnum_to_if(dev, ifnum);
 401
 402         if (!iface || iface->num_altsetting < 2)
 403                 return -EINVAL;
 404
 405         alts = &iface->altsetting[1];
 406
 407 add_sync_ep:
 408         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 409                                                    alts, ep, !subs->direction,
 410                                                    SND_USB_ENDPOINT_TYPE_DATA);
 411         if (!subs->sync_endpoint)
 412                 return -EINVAL;
 413
 414         subs->sync_endpoint->is_implicit_feedback = 1;
 415
 416         subs->data_endpoint->sync_master = subs->sync_endpoint;
 417
 418         return 1;
 419 }
 420
 421 static int set_sync_endpoint(struct snd_usb_substream *subs,
 422                              struct audioformat *fmt,
 423                              struct usb_device *dev,
 424                              struct usb_host_interface *alts,
 425                              struct usb_interface_descriptor *altsd)
 426 {
 427         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 428         unsigned int ep, attr;
 429         bool implicit_fb;
 430         int err;
 431
 432         /* we need a sync pipe in async OUT or adaptive IN mode */
 433         /* check the number of EP, since some devices have broken
 434          * descriptors which fool us.  if it has only one EP,
 435          * assume it as adaptive-out or sync-in.
 436          */
 437         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 438
 439         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 440                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 441
 442                 /*
 443                  * In these modes the notion of sync_endpoint is irrelevant.
 444                  * Reset pointers to avoid using stale data from previously
 445                  * used settings, e.g. when configuration and endpoints were
 446                  * changed
 447                  */
 448
 449                 subs->sync_endpoint = NULL;
 450                 subs->data_endpoint->sync_master = NULL;
 451         }
 452
 453         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 454         if (err < 0)
 455                 return err;
 456
 457         /* endpoint set by quirk */
 458         if (err > 0)
 459                 return 0;
 460
 461         if (altsd->bNumEndpoints < 2)
 462                 return 0;
 463
 464         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 465                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 466             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 467                 return 0;
 468
 469         /*
 470          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 471          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 472          * error fall back to SYNC mode and don't create sync endpoint
 473          */
 474
 475         /* check sync-pipe endpoint */
 476         /* ... and check descriptor size before accessing bSynchAddress
 477            because there is a version of the SB Audigy 2 NX firmware lacking
 478            the audio fields in the endpoint descriptors */
 479         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 480             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 481              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 482                 dev_err(&dev->dev,
 483                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 484                            fmt->iface, fmt->altsetting,
 485                            get_endpoint(alts, 1)->bmAttributes,
 486                            get_endpoint(alts, 1)->bLength,
 487                            get_endpoint(alts, 1)->bSynchAddress);
 488                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 489                         return 0;
 490                 return -EINVAL;
 491         }
 492         ep = get_endpoint(alts, 1)->bEndpointAddress;
 493         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 494             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 495             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 496              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 497                 dev_err(&dev->dev,
 498                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 499                            fmt->iface, fmt->altsetting,
 500                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 501                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 502                         return 0;
 503                 return -EINVAL;
 504         }
 505
 506         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 507                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 508
 509         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 510                                                    alts, ep, !subs->direction,
 511                                                    implicit_fb ?
 512                                                         SND_USB_ENDPOINT_TYPE_DATA :
 513                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 514
 515         if (!subs->sync_endpoint) {
 516                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 517                         return 0;
 518                 return -EINVAL;
 519         }
 520
 521         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 522
 523         subs->data_endpoint->sync_master = subs->sync_endpoint;
 524
 525         return 0;
 526 }
 527
 528 /*
 529  * find a matching format and set up the interface
 530  */
 531 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 532 {
 533         struct usb_device *dev = subs->dev;
 534         struct usb_host_interface *alts;
 535         struct usb_interface_descriptor *altsd;
 536         struct usb_interface *iface;
 537         int err;
 538
 539         iface = usb_ifnum_to_if(dev, fmt->iface);
 540         if (WARN_ON(!iface))
 541                 return -EINVAL;
 542         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 543         if (WARN_ON(!alts))
 544                 return -EINVAL;
 545         altsd = get_iface_desc(alts);
 546
 547         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 548                 return 0;
 549
 550         /* close the old interface */
 551         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 552                 if (!subs->stream->chip->keep_iface) {
 553                         err = usb_set_interface(subs->dev, subs->interface, 0);
 554                         if (err < 0) {
 555                                 dev_err(&dev->dev,
 556                                         "%d:%d: return to setting 0 failed (%d)\n",
 557                                         fmt->iface, fmt->altsetting, err);
 558                                 return -EIO;
 559                         }
 560                 }
 561                 subs->interface = -1;
 562                 subs->altset_idx = 0;
 563         }
 564
 565         if (subs->need_setup_fmt)
 566                 subs->need_setup_fmt = false;
 567
 568         /* set interface */
 569         if (iface->cur_altsetting != alts) {
 570                 err = snd_usb_select_mode_quirk(subs, fmt);
 571                 if (err < 0)
 572                         return -EIO;
 573
 574                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 575                 if (err < 0) {
 576                         dev_err(&dev->dev,
 577                                 "%d:%d: usb_set_interface failed (%d)\n",
 578                                 fmt->iface, fmt->altsetting, err);
 579                         return -EIO;
 580                 }
 581                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 582                         fmt->iface, fmt->altsetting);
 583                 snd_usb_set_interface_quirk(dev);
 584         }
 585
 586         subs->interface = fmt->iface;
 587         subs->altset_idx = fmt->altset_idx;
 588         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 589                                                    alts, fmt->endpoint, subs->direction,
 590                                                    SND_USB_ENDPOINT_TYPE_DATA);
 591
 592         if (!subs->data_endpoint)
 593                 return -EINVAL;
 594
 595         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 596         if (err < 0)
 597                 return err;
 598
 599         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 600         if (err < 0)
 601                 return err;
 602
 603         subs->cur_audiofmt = fmt;
 604
 605         snd_usb_set_format_quirk(subs, fmt);
 606
 607         return 0;
 608 }
 609
 610 /*
 611  * Return the score of matching two audioformats.
 612  * Veto the audioformat if:
 613  * - It has no channels for some reason.
 614  * - Requested PCM format is not supported.
 615  * - Requested sample rate is not supported.
 616  */
 617 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 618                                        struct audioformat *fp,
 619                                        struct audioformat *match, int rate,
 620                                        snd_pcm_format_t pcm_format)
 621 {
 622         int i;
 623         int score = 0;
 624
 625         if (fp->channels < 1) {
 626                 dev_dbg(&subs->dev->dev,
 627                         "%s: (fmt @%p) no channels\n", __func__, fp);
 628                 return 0;
 629         }
 630
 631         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 632                 dev_dbg(&subs->dev->dev,
 633                         "%s: (fmt @%p) no match for format %d\n", __func__,
 634                         fp, pcm_format);
 635                 return 0;
 636         }
 637
 638         for (i = 0; i < fp->nr_rates; i++) {
 639                 if (fp->rate_table[i] == rate) {
 640                         score++;
 641                         break;
 642                 }
 643         }
 644         if (!score) {
 645                 dev_dbg(&subs->dev->dev,
 646                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 647                         fp, rate);
 648                 return 0;
 649         }
 650
 651         if (fp->channels == match->channels)
 652                 score++;
 653
 654         dev_dbg(&subs->dev->dev,
 655                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 656
 657         return score;
 658 }
 659
 660 /*
 661  * Configure the sync ep using the rate and pcm format of the data ep.
 662  */
 663 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 664 {
 665         int ret;
 666         struct audioformat *fp;
 667         struct audioformat *sync_fp = NULL;
 668         int cur_score = 0;
 669         int sync_period_bytes = subs->period_bytes;
 670         struct snd_usb_substream *sync_subs =
 671                 &subs->stream->substream[subs->direction ^ 1];
 672
 673         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 674             !subs->stream)
 675                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 676                                                    subs->pcm_format,
 677                                                    subs->channels,
 678                                                    subs->period_bytes,
 679                                                    0, 0,
 680                                                    subs->cur_rate,
 681                                                    subs->cur_audiofmt,
 682                                                    NULL);
 683
 684         /* Try to find the best matching audioformat. */
 685         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 686                 int score = match_endpoint_audioformats(subs,
 687                                                         fp, subs->cur_audiofmt,
 688                         subs->cur_rate, subs->pcm_format);
 689
 690                 if (score > cur_score) {
 691                         sync_fp = fp;
 692                         cur_score = score;
 693                 }
 694         }
 695
 696         if (unlikely(sync_fp == NULL)) {
 697                 dev_err(&subs->dev->dev,
 698                         "%s: no valid audioformat for sync ep %x found\n",
 699                         __func__, sync_subs->ep_num);
 700                 return -EINVAL;
 701         }
 702
 703         /*
 704          * Recalculate the period bytes if channel number differ between
 705          * data and sync ep audioformat.
 706          */
 707         if (sync_fp->channels != subs->channels) {
 708                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 709                         sync_fp->channels;
 710                 dev_dbg(&subs->dev->dev,
 711                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 712                         __func__, subs->period_bytes, sync_period_bytes);
 713         }
 714
 715         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 716                                           subs->pcm_format,
 717                                           sync_fp->channels,
 718                                           sync_period_bytes,
 719                                           0, 0,
 720                                           subs->cur_rate,
 721                                           sync_fp,
 722                                           NULL);
 723
 724         return ret;
 725 }
 726
 727 /*
 728  * configure endpoint params
 729  *
 730  * called  during initial setup and upon resume
 731  */
 732 static int configure_endpoint(struct snd_usb_substream *subs)
 733 {
 734         int ret;
 735
 736         /* format changed */
 737         stop_endpoints(subs);
 738         sync_pending_stops(subs);
 739         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 740                                           subs->pcm_format,
 741                                           subs->channels,
 742                                           subs->period_bytes,
 743                                           subs->period_frames,
 744                                           subs->buffer_periods,
 745                                           subs->cur_rate,
 746                                           subs->cur_audiofmt,
 747                                           subs->sync_endpoint);
 748         if (ret < 0)
 749                 return ret;
 750
 751         if (subs->sync_endpoint)
 752                 ret = configure_sync_endpoint(subs);
 753
 754         return ret;
 755 }
 756
 757 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 758 {
 759         int ret;
 760
 761         if (!subs->str_pd)
 762                 return 0;
 763
 764         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 765         if (ret < 0) {
 766                 dev_err(&subs->dev->dev,
 767                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 768                         subs->str_pd->pd_id, state, ret);
 769                 return ret;
 770         }
 771
 772         return 0;
 773 }
 774
 775 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 776 {
 777         int ret;
 778
 779         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 780         if (ret < 0)
 781                 return ret;
 782
 783         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 784         if (ret < 0)
 785                 return ret;
 786
 787         return 0;
 788 }
 789
 790 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 791 {
 792         int ret;
 793
 794         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 795         if (ret < 0)
 796                 return ret;
 797
 798         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 799         if (ret < 0)
 800                 return ret;
 801
 802         return 0;
 803 }
 804
 805 /*
 806  * hw_params callback
 807  *
 808  * allocate a buffer and set the given audio format.
 809  *
 810  * so far we use a physically linear buffer although packetize transfer
 811  * doesn't need a continuous area.
 812  * if sg buffer is supported on the later version of alsa, we'll follow
 813  * that.
 814  */
 815 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 816                              struct snd_pcm_hw_params *hw_params)
 817 {
 818         struct snd_usb_substream *subs = substream->runtime->private_data;
 819         struct audioformat *fmt;
 820         int ret;
 821
 822         ret = snd_media_start_pipeline(subs);
 823         if (ret)
 824                 return ret;
 825
 826         subs->pcm_format = params_format(hw_params);
 827         subs->period_bytes = params_period_bytes(hw_params);
 828         subs->period_frames = params_period_size(hw_params);
 829         subs->buffer_periods = params_periods(hw_params);
 830         subs->channels = params_channels(hw_params);
 831         subs->cur_rate = params_rate(hw_params);
 832
 833         fmt = find_format(subs);
 834         if (!fmt) {
 835                 dev_dbg(&subs->dev->dev,
 836                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 837                            subs->pcm_format, subs->cur_rate, subs->channels);
 838                 ret = -EINVAL;
 839                 goto stop_pipeline;
 840         }
 841
 842         ret = snd_usb_lock_shutdown(subs->stream->chip);
 843         if (ret < 0)
 844                 goto stop_pipeline;
 845
 846         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 847         if (ret < 0)
 848                 goto unlock;
 849
 850         ret = set_format(subs, fmt);
 851         if (ret < 0)
 852                 goto unlock;
 853
 854         subs->interface = fmt->iface;
 855         subs->altset_idx = fmt->altset_idx;
 856         subs->need_setup_ep = true;
 857
 858  unlock:
 859         snd_usb_unlock_shutdown(subs->stream->chip);
 860         if (ret < 0)
 861                 goto stop_pipeline;
 862         return ret;
 863
 864  stop_pipeline:
 865         snd_media_stop_pipeline(subs);
 866         return ret;
 867 }
 868
 869 /*
 870  * hw_free callback
 871  *
 872  * reset the audio format and release the buffer
 873  */
 874 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 875 {
 876         struct snd_usb_substream *subs = substream->runtime->private_data;
 877
 878         snd_media_stop_pipeline(subs);
 879         subs->cur_audiofmt = NULL;
 880         subs->cur_rate = 0;
 881         subs->period_bytes = 0;
 882         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 883                 stop_endpoints(subs);
 884                 sync_pending_stops(subs);
 885                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 886                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 887                 snd_usb_unlock_shutdown(subs->stream->chip);
 888         }
 889
 890         return 0;
 891 }
 892
 893 /*
 894  * prepare callback
 895  *
 896  * only a few subtle things...
 897  */
 898 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 899 {
 900         struct snd_pcm_runtime *runtime = substream->runtime;
 901         struct snd_usb_substream *subs = runtime->private_data;
 902         struct usb_host_interface *alts;
 903         struct usb_interface *iface;
 904         int ret;
 905
 906         if (! subs->cur_audiofmt) {
 907                 dev_err(&subs->dev->dev, "no format is specified!\n");
 908                 return -ENXIO;
 909         }
 910
 911         ret = snd_usb_lock_shutdown(subs->stream->chip);
 912         if (ret < 0)
 913                 return ret;
 914         if (snd_BUG_ON(!subs->data_endpoint)) {
 915                 ret = -EIO;
 916                 goto unlock;
 917         }
 918
 919         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 920         if (ret < 0)
 921                 goto unlock;
 922
 923         ret = set_format(subs, subs->cur_audiofmt);
 924         if (ret < 0)
 925                 goto unlock;
 926
 927         if (subs->need_setup_ep) {
 928
 929                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 930                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 931                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 932                                                subs->cur_audiofmt->iface,
 933                                                alts,
 934                                                subs->cur_audiofmt,
 935                                                subs->cur_rate);
 936                 if (ret < 0)
 937                         goto unlock;
 938
 939                 ret = configure_endpoint(subs);
 940                 if (ret < 0)
 941                         goto unlock;
 942                 subs->need_setup_ep = false;
 943         }
 944
 945         /* some unit conversions in runtime */
 946         subs->data_endpoint->maxframesize =
 947                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 948         subs->data_endpoint->curframesize =
 949                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 950
 951         /* reset the pointer */
 952         subs->hwptr_done = 0;
 953         subs->transfer_done = 0;
 954         subs->last_delay = 0;
 955         subs->last_frame_number = 0;
 956         runtime->delay = 0;
 957
 958         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 959          * updates for all URBs would happen at the same time when starting */
 960         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 961                 ret = start_endpoints(subs);
 962
 963  unlock:
 964         snd_usb_unlock_shutdown(subs->stream->chip);
 965         return ret;
 966 }
 967
 968 static const struct snd_pcm_hardware snd_usb_hardware =
 969 {
 970         .info =                 SNDRV_PCM_INFO_MMAP |
 971                                 SNDRV_PCM_INFO_MMAP_VALID |
 972                                 SNDRV_PCM_INFO_BATCH |
 973                                 SNDRV_PCM_INFO_INTERLEAVED |
 974                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 975                                 SNDRV_PCM_INFO_PAUSE,
 976         .buffer_bytes_max =     1024 * 1024,
 977         .period_bytes_min =     64,
 978         .period_bytes_max =     512 * 1024,
 979         .periods_min =          2,
 980         .periods_max =          1024,
 981 };
 982
 983 static int hw_check_valid_format(struct snd_usb_substream *subs,
 984                                  struct snd_pcm_hw_params *params,
 985                                  struct audioformat *fp)
 986 {
 987         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 988         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 989         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 990         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 991         struct snd_mask check_fmts;
 992         unsigned int ptime;
 993
 994         /* check the format */
 995         snd_mask_none(&check_fmts);
 996         check_fmts.bits[0] = (u32)fp->formats;
 997         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 998         snd_mask_intersect(&check_fmts, fmts);
 999         if (snd_mask_empty(&check_fmts)) {
1000                 hwc_debug("   > check: no supported format %d\n", fp->format);
1001                 return 0;
1002         }
1003         /* check the channels */
1004         if (fp->channels < ct->min || fp->channels > ct->max) {
1005                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1006                 return 0;
1007         }
1008         /* check the rate is within the range */
1009         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1010                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1011                 return 0;
1012         }
1013         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1014                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1015                 return 0;
1016         }
1017         /* check whether the period time is >= the data packet interval */
1018         if (subs->speed != USB_SPEED_FULL) {
1019                 ptime = 125 * (1 << fp->datainterval);
1020                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1021                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1022                         return 0;
1023                 }
1024         }
1025         return 1;
1026 }
1027
1028 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1029                         struct snd_pcm_hw_rule *rule)
1030 {
1031         struct snd_usb_substream *subs = rule->private;
1032         struct audioformat *fp;
1033         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1034         unsigned int rmin, rmax;
1035         int changed;
1036
1037         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1038         changed = 0;
1039         rmin = rmax = 0;
1040         list_for_each_entry(fp, &subs->fmt_list, list) {
1041                 if (!hw_check_valid_format(subs, params, fp))
1042                         continue;
1043                 if (changed++) {
1044                         if (rmin > fp->rate_min)
1045                                 rmin = fp->rate_min;
1046                         if (rmax < fp->rate_max)
1047                                 rmax = fp->rate_max;
1048                 } else {
1049                         rmin = fp->rate_min;
1050                         rmax = fp->rate_max;
1051                 }
1052         }
1053
1054         if (!changed) {
1055                 hwc_debug("  --> get empty\n");
1056                 it->empty = 1;
1057                 return -EINVAL;
1058         }
1059
1060         changed = 0;
1061         if (it->min < rmin) {
1062                 it->min = rmin;
1063                 it->openmin = 0;
1064                 changed = 1;
1065         }
1066         if (it->max > rmax) {
1067                 it->max = rmax;
1068                 it->openmax = 0;
1069                 changed = 1;
1070         }
1071         if (snd_interval_checkempty(it)) {
1072                 it->empty = 1;
1073                 return -EINVAL;
1074         }
1075         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1076         return changed;
1077 }
1078
1079
1080 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1081                             struct snd_pcm_hw_rule *rule)
1082 {
1083         struct snd_usb_substream *subs = rule->private;
1084         struct audioformat *fp;
1085         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1086         unsigned int rmin, rmax;
1087         int changed;
1088
1089         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1090         changed = 0;
1091         rmin = rmax = 0;
1092         list_for_each_entry(fp, &subs->fmt_list, list) {
1093                 if (!hw_check_valid_format(subs, params, fp))
1094                         continue;
1095                 if (changed++) {
1096                         if (rmin > fp->channels)
1097                                 rmin = fp->channels;
1098                         if (rmax < fp->channels)
1099                                 rmax = fp->channels;
1100                 } else {
1101                         rmin = fp->channels;
1102                         rmax = fp->channels;
1103                 }
1104         }
1105
1106         if (!changed) {
1107                 hwc_debug("  --> get empty\n");
1108                 it->empty = 1;
1109                 return -EINVAL;
1110         }
1111
1112         changed = 0;
1113         if (it->min < rmin) {
1114                 it->min = rmin;
1115                 it->openmin = 0;
1116                 changed = 1;
1117         }
1118         if (it->max > rmax) {
1119                 it->max = rmax;
1120                 it->openmax = 0;
1121                 changed = 1;
1122         }
1123         if (snd_interval_checkempty(it)) {
1124                 it->empty = 1;
1125                 return -EINVAL;
1126         }
1127         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1128         return changed;
1129 }
1130
1131 static int hw_rule_format(struct snd_pcm_hw_params *params,
1132                           struct snd_pcm_hw_rule *rule)
1133 {
1134         struct snd_usb_substream *subs = rule->private;
1135         struct audioformat *fp;
1136         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1137         u64 fbits;
1138         u32 oldbits[2];
1139         int changed;
1140
1141         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1142         fbits = 0;
1143         list_for_each_entry(fp, &subs->fmt_list, list) {
1144                 if (!hw_check_valid_format(subs, params, fp))
1145                         continue;
1146                 fbits |= fp->formats;
1147         }
1148
1149         oldbits[0] = fmt->bits[0];
1150         oldbits[1] = fmt->bits[1];
1151         fmt->bits[0] &= (u32)fbits;
1152         fmt->bits[1] &= (u32)(fbits >> 32);
1153         if (!fmt->bits[0] && !fmt->bits[1]) {
1154                 hwc_debug("  --> get empty\n");
1155                 return -EINVAL;
1156         }
1157         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1158         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1159         return changed;
1160 }
1161
1162 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1163                                struct snd_pcm_hw_rule *rule)
1164 {
1165         struct snd_usb_substream *subs = rule->private;
1166         struct audioformat *fp;
1167         struct snd_interval *it;
1168         unsigned char min_datainterval;
1169         unsigned int pmin;
1170         int changed;
1171
1172         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1173         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1174         min_datainterval = 0xff;
1175         list_for_each_entry(fp, &subs->fmt_list, list) {
1176                 if (!hw_check_valid_format(subs, params, fp))
1177                         continue;
1178                 min_datainterval = min(min_datainterval, fp->datainterval);
1179         }
1180         if (min_datainterval == 0xff) {
1181                 hwc_debug("  --> get empty\n");
1182                 it->empty = 1;
1183                 return -EINVAL;
1184         }
1185         pmin = 125 * (1 << min_datainterval);
1186         changed = 0;
1187         if (it->min < pmin) {
1188                 it->min = pmin;
1189                 it->openmin = 0;
1190                 changed = 1;
1191         }
1192         if (snd_interval_checkempty(it)) {
1193                 it->empty = 1;
1194                 return -EINVAL;
1195         }
1196         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1197         return changed;
1198 }
1199
1200 /*
1201  *  If the device supports unusual bit rates, does the request meet these?
1202  */
1203 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1204                                   struct snd_usb_substream *subs)
1205 {
1206         struct audioformat *fp;
1207         int *rate_list;
1208         int count = 0, needs_knot = 0;
1209         int err;
1210
1211         kfree(subs->rate_list.list);
1212         subs->rate_list.list = NULL;
1213
1214         list_for_each_entry(fp, &subs->fmt_list, list) {
1215                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1216                         return 0;
1217                 count += fp->nr_rates;
1218                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1219                         needs_knot = 1;
1220         }
1221         if (!needs_knot)
1222                 return 0;
1223
1224         subs->rate_list.list = rate_list =
1225                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1226         if (!subs->rate_list.list)
1227                 return -ENOMEM;
1228         subs->rate_list.count = count;
1229         subs->rate_list.mask = 0;
1230         count = 0;
1231         list_for_each_entry(fp, &subs->fmt_list, list) {
1232                 int i;
1233                 for (i = 0; i < fp->nr_rates; i++)
1234                         rate_list[count++] = fp->rate_table[i];
1235         }
1236         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1237                                          &subs->rate_list);
1238         if (err < 0)
1239                 return err;
1240
1241         return 0;
1242 }
1243
1244
1245 /*
1246  * set up the runtime hardware information.
1247  */
1248
1249 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1250 {
1251         struct audioformat *fp;
1252         unsigned int pt, ptmin;
1253         int param_period_time_if_needed;
1254         int err;
1255
1256         runtime->hw.formats = subs->formats;
1257
1258         runtime->hw.rate_min = 0x7fffffff;
1259         runtime->hw.rate_max = 0;
1260         runtime->hw.channels_min = 256;
1261         runtime->hw.channels_max = 0;
1262         runtime->hw.rates = 0;
1263         ptmin = UINT_MAX;
1264         /* check min/max rates and channels */
1265         list_for_each_entry(fp, &subs->fmt_list, list) {
1266                 runtime->hw.rates |= fp->rates;
1267                 if (runtime->hw.rate_min > fp->rate_min)
1268                         runtime->hw.rate_min = fp->rate_min;
1269                 if (runtime->hw.rate_max < fp->rate_max)
1270                         runtime->hw.rate_max = fp->rate_max;
1271                 if (runtime->hw.channels_min > fp->channels)
1272                         runtime->hw.channels_min = fp->channels;
1273                 if (runtime->hw.channels_max < fp->channels)
1274                         runtime->hw.channels_max = fp->channels;
1275                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1276                         /* FIXME: there might be more than one audio formats... */
1277                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1278                                 fp->frame_size;
1279                 }
1280                 pt = 125 * (1 << fp->datainterval);
1281                 ptmin = min(ptmin, pt);
1282         }
1283
1284         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1285         if (subs->speed == USB_SPEED_FULL)
1286                 /* full speed devices have fixed data packet interval */
1287                 ptmin = 1000;
1288         if (ptmin == 1000)
1289                 /* if period time doesn't go below 1 ms, no rules needed */
1290                 param_period_time_if_needed = -1;
1291
1292         err = snd_pcm_hw_constraint_minmax(runtime,
1293                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1294                                            ptmin, UINT_MAX);
1295         if (err < 0)
1296                 return err;
1297
1298         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1299                                   hw_rule_rate, subs,
1300                                   SNDRV_PCM_HW_PARAM_FORMAT,
1301                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1302                                   param_period_time_if_needed,
1303                                   -1);
1304         if (err < 0)
1305                 return err;
1306         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1307                                   hw_rule_channels, subs,
1308                                   SNDRV_PCM_HW_PARAM_FORMAT,
1309                                   SNDRV_PCM_HW_PARAM_RATE,
1310                                   param_period_time_if_needed,
1311                                   -1);
1312         if (err < 0)
1313                 return err;
1314         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1315                                   hw_rule_format, subs,
1316                                   SNDRV_PCM_HW_PARAM_RATE,
1317                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1318                                   param_period_time_if_needed,
1319                                   -1);
1320         if (err < 0)
1321                 return err;
1322         if (param_period_time_if_needed >= 0) {
1323                 err = snd_pcm_hw_rule_add(runtime, 0,
1324                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1325                                           hw_rule_period_time, subs,
1326                                           SNDRV_PCM_HW_PARAM_FORMAT,
1327                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1328                                           SNDRV_PCM_HW_PARAM_RATE,
1329                                           -1);
1330                 if (err < 0)
1331                         return err;
1332         }
1333         err = snd_usb_pcm_check_knot(runtime, subs);
1334         if (err < 0)
1335                 return err;
1336
1337         return snd_usb_autoresume(subs->stream->chip);
1338 }
1339
1340 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1341 {
1342         int direction = substream->stream;
1343         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1344         struct snd_pcm_runtime *runtime = substream->runtime;
1345         struct snd_usb_substream *subs = &as->substream[direction];
1346         int ret;
1347
1348         subs->interface = -1;
1349         subs->altset_idx = 0;
1350         runtime->hw = snd_usb_hardware;
1351         runtime->private_data = subs;
1352         subs->pcm_substream = substream;
1353         /* runtime PM is also done there */
1354
1355         /* initialize DSD/DOP context */
1356         subs->dsd_dop.byte_idx = 0;
1357         subs->dsd_dop.channel = 0;
1358         subs->dsd_dop.marker = 1;
1359
1360         ret = setup_hw_info(runtime, subs);
1361         if (ret == 0) {
1362                 ret = snd_media_stream_init(subs, as->pcm, direction);
1363                 if (ret)
1364                         snd_usb_autosuspend(subs->stream->chip);
1365         }
1366         return ret;
1367 }
1368
1369 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1370 {
1371         int direction = substream->stream;
1372         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1373         struct snd_usb_substream *subs = &as->substream[direction];
1374         int ret;
1375
1376         snd_media_stop_pipeline(subs);
1377
1378         if (!as->chip->keep_iface &&
1379             subs->interface >= 0 &&
1380             !snd_usb_lock_shutdown(subs->stream->chip)) {
1381                 usb_set_interface(subs->dev, subs->interface, 0);
1382                 subs->interface = -1;
1383                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1384                 snd_usb_unlock_shutdown(subs->stream->chip);
1385                 if (ret < 0)
1386                         return ret;
1387         }
1388
1389         subs->pcm_substream = NULL;
1390         snd_usb_autosuspend(subs->stream->chip);
1391
1392         return 0;
1393 }
1394
1395 /* Since a URB can handle only a single linear buffer, we must use double
1396  * buffering when the data to be transferred overflows the buffer boundary.
1397  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1398  * for all URBs.
1399  */
1400 static void retire_capture_urb(struct snd_usb_substream *subs,
1401                                struct urb *urb)
1402 {
1403         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1404         unsigned int stride, frames, bytes, oldptr;
1405         int i, period_elapsed = 0;
1406         unsigned long flags;
1407         unsigned char *cp;
1408         int current_frame_number;
1409
1410         /* read frame number here, update pointer in critical section */
1411         current_frame_number = usb_get_current_frame_number(subs->dev);
1412
1413         stride = runtime->frame_bits >> 3;
1414
1415         for (i = 0; i < urb->number_of_packets; i++) {
1416                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1417                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1418                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1419                                 i, urb->iso_frame_desc[i].status);
1420                         // continue;
1421                 }
1422                 bytes = urb->iso_frame_desc[i].actual_length;
1423                 frames = bytes / stride;
1424                 if (!subs->txfr_quirk)
1425                         bytes = frames * stride;
1426                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1427                         int oldbytes = bytes;
1428                         bytes = frames * stride;
1429                         dev_warn_ratelimited(&subs->dev->dev,
1430                                  "Corrected urb data len. %d->%d\n",
1431                                                         oldbytes, bytes);
1432                 }
1433                 /* update the current pointer */
1434                 spin_lock_irqsave(&subs->lock, flags);
1435                 oldptr = subs->hwptr_done;
1436                 subs->hwptr_done += bytes;
1437                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1438                         subs->hwptr_done -= runtime->buffer_size * stride;
1439                 frames = (bytes + (oldptr % stride)) / stride;
1440                 subs->transfer_done += frames;
1441                 if (subs->transfer_done >= runtime->period_size) {
1442                         subs->transfer_done -= runtime->period_size;
1443                         period_elapsed = 1;
1444                 }
1445                 /* capture delay is by construction limited to one URB,
1446                  * reset delays here
1447                  */
1448                 runtime->delay = subs->last_delay = 0;
1449
1450                 /* realign last_frame_number */
1451                 subs->last_frame_number = current_frame_number;
1452                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1453
1454                 spin_unlock_irqrestore(&subs->lock, flags);
1455                 /* copy a data chunk */
1456                 if (oldptr + bytes > runtime->buffer_size * stride) {
1457                         unsigned int bytes1 =
1458                                         runtime->buffer_size * stride - oldptr;
1459                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1460                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1461                 } else {
1462                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1463                 }
1464         }
1465
1466         if (period_elapsed)
1467                 snd_pcm_period_elapsed(subs->pcm_substream);
1468 }
1469
1470 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1471                                              struct urb *urb, unsigned int bytes)
1472 {
1473         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1474         unsigned int stride = runtime->frame_bits >> 3;
1475         unsigned int dst_idx = 0;
1476         unsigned int src_idx = subs->hwptr_done;
1477         unsigned int wrap = runtime->buffer_size * stride;
1478         u8 *dst = urb->transfer_buffer;
1479         u8 *src = runtime->dma_area;
1480         u8 marker[] = { 0x05, 0xfa };
1481
1482         /*
1483          * The DSP DOP format defines a way to transport DSD samples over
1484          * normal PCM data endpoints. It requires stuffing of marker bytes
1485          * (0x05 and 0xfa, alternating per sample frame), and then expects
1486          * 2 additional bytes of actual payload. The whole frame is stored
1487          * LSB.
1488          *
1489          * Hence, for a stereo transport, the buffer layout looks like this,
1490          * where L refers to left channel samples and R to right.
1491          *
1492          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1493          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1494          *   .....
1495          *
1496          */
1497
1498         while (bytes--) {
1499                 if (++subs->dsd_dop.byte_idx == 3) {
1500                         /* frame boundary? */
1501                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1502                         src_idx += 2;
1503                         subs->dsd_dop.byte_idx = 0;
1504
1505                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1506                                 /* alternate the marker */
1507                                 subs->dsd_dop.marker++;
1508                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1509                                 subs->dsd_dop.channel = 0;
1510                         }
1511                 } else {
1512                         /* stuff the DSD payload */
1513                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1514
1515                         if (subs->cur_audiofmt->dsd_bitrev)
1516                                 dst[dst_idx++] = bitrev8(src[idx]);
1517                         else
1518                                 dst[dst_idx++] = src[idx];
1519
1520                         subs->hwptr_done++;
1521                 }
1522         }
1523         if (subs->hwptr_done >= runtime->buffer_size * stride)
1524                 subs->hwptr_done -= runtime->buffer_size * stride;
1525 }
1526
1527 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1528                         int offset, int stride, unsigned int bytes)
1529 {
1530         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1531
1532         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1533                 /* err, the transferred area goes over buffer boundary. */
1534                 unsigned int bytes1 =
1535                         runtime->buffer_size * stride - subs->hwptr_done;
1536                 memcpy(urb->transfer_buffer + offset,
1537                        runtime->dma_area + subs->hwptr_done, bytes1);
1538                 memcpy(urb->transfer_buffer + offset + bytes1,
1539                        runtime->dma_area, bytes - bytes1);
1540         } else {
1541                 memcpy(urb->transfer_buffer + offset,
1542                        runtime->dma_area + subs->hwptr_done, bytes);
1543         }
1544         subs->hwptr_done += bytes;
1545         if (subs->hwptr_done >= runtime->buffer_size * stride)
1546                 subs->hwptr_done -= runtime->buffer_size * stride;
1547 }
1548
1549 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1550                                       struct urb *urb, int stride,
1551                                       unsigned int bytes)
1552 {
1553         __le32 packet_length;
1554         int i;
1555
1556         /* Put __le32 length descriptor at start of each packet. */
1557         for (i = 0; i < urb->number_of_packets; i++) {
1558                 unsigned int length = urb->iso_frame_desc[i].length;
1559                 unsigned int offset = urb->iso_frame_desc[i].offset;
1560
1561                 packet_length = cpu_to_le32(length);
1562                 offset += i * sizeof(packet_length);
1563                 urb->iso_frame_desc[i].offset = offset;
1564                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1565                 memcpy(urb->transfer_buffer + offset,
1566                        &packet_length, sizeof(packet_length));
1567                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1568                             stride, length);
1569         }
1570         /* Adjust transfer size accordingly. */
1571         bytes += urb->number_of_packets * sizeof(packet_length);
1572         return bytes;
1573 }
1574
1575 static void prepare_playback_urb(struct snd_usb_substream *subs,
1576                                  struct urb *urb)
1577 {
1578         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1579         struct snd_usb_endpoint *ep = subs->data_endpoint;
1580         struct snd_urb_ctx *ctx = urb->context;
1581         unsigned int counts, frames, bytes;
1582         int i, stride, period_elapsed = 0;
1583         unsigned long flags;
1584
1585         stride = runtime->frame_bits >> 3;
1586
1587         frames = 0;
1588         urb->number_of_packets = 0;
1589         spin_lock_irqsave(&subs->lock, flags);
1590         subs->frame_limit += ep->max_urb_frames;
1591         for (i = 0; i < ctx->packets; i++) {
1592                 if (ctx->packet_size[i])
1593                         counts = ctx->packet_size[i];
1594                 else if (ep->sync_master)
1595                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1596                 else
1597                         counts = snd_usb_endpoint_next_packet_size(ep);
1598
1599                 /* set up descriptor */
1600                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1601                 urb->iso_frame_desc[i].length = counts * ep->stride;
1602                 frames += counts;
1603                 urb->number_of_packets++;
1604                 subs->transfer_done += counts;
1605                 if (subs->transfer_done >= runtime->period_size) {
1606                         subs->transfer_done -= runtime->period_size;
1607                         subs->frame_limit = 0;
1608                         period_elapsed = 1;
1609                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1610                                 if (subs->transfer_done > 0) {
1611                                         /* FIXME: fill-max mode is not
1612                                          * supported yet */
1613                                         frames -= subs->transfer_done;
1614                                         counts -= subs->transfer_done;
1615                                         urb->iso_frame_desc[i].length =
1616                                                 counts * ep->stride;
1617                                         subs->transfer_done = 0;
1618                                 }
1619                                 i++;
1620                                 if (i < ctx->packets) {
1621                                         /* add a transfer delimiter */
1622                                         urb->iso_frame_desc[i].offset =
1623                                                 frames * ep->stride;
1624                                         urb->iso_frame_desc[i].length = 0;
1625                                         urb->number_of_packets++;
1626                                 }
1627                                 break;
1628                         }
1629                 }
1630                 /* finish at the period boundary or after enough frames */
1631                 if ((period_elapsed ||
1632                                 subs->transfer_done >= subs->frame_limit) &&
1633                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1634                         break;
1635         }
1636         bytes = frames * ep->stride;
1637
1638         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1639                      subs->cur_audiofmt->dsd_dop)) {
1640                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1641         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1642                            subs->cur_audiofmt->dsd_bitrev)) {
1643                 /* bit-reverse the bytes */
1644                 u8 *buf = urb->transfer_buffer;
1645                 for (i = 0; i < bytes; i++) {
1646                         int idx = (subs->hwptr_done + i)
1647                                 % (runtime->buffer_size * stride);
1648                         buf[i] = bitrev8(runtime->dma_area[idx]);
1649                 }
1650
1651                 subs->hwptr_done += bytes;
1652                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1653                         subs->hwptr_done -= runtime->buffer_size * stride;
1654         } else {
1655                 /* usual PCM */
1656                 if (!subs->tx_length_quirk)
1657                         copy_to_urb(subs, urb, 0, stride, bytes);
1658                 else
1659                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1660                         /* bytes is now amount of outgoing data */
1661         }
1662
1663         /* update delay with exact number of samples queued */
1664         runtime->delay = subs->last_delay;
1665         runtime->delay += frames;
1666         subs->last_delay = runtime->delay;
1667
1668         /* realign last_frame_number */
1669         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1670         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1671
1672         if (subs->trigger_tstamp_pending_update) {
1673                 /* this is the first actual URB submitted,
1674                  * update trigger timestamp to reflect actual start time
1675                  */
1676                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1677                 subs->trigger_tstamp_pending_update = false;
1678         }
1679
1680         spin_unlock_irqrestore(&subs->lock, flags);
1681         urb->transfer_buffer_length = bytes;
1682         if (period_elapsed)
1683                 snd_pcm_period_elapsed(subs->pcm_substream);
1684 }
1685
1686 /*
1687  * process after playback data complete
1688  * - decrease the delay count again
1689  */
1690 static void retire_playback_urb(struct snd_usb_substream *subs,
1691                                struct urb *urb)
1692 {
1693         unsigned long flags;
1694         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1695         struct snd_usb_endpoint *ep = subs->data_endpoint;
1696         int processed = urb->transfer_buffer_length / ep->stride;
1697         int est_delay;
1698
1699         /* ignore the delay accounting when processed=0 is given, i.e.
1700          * silent payloads are processed before handling the actual data
1701          */
1702         if (!processed)
1703                 return;
1704
1705         spin_lock_irqsave(&subs->lock, flags);
1706         if (!subs->last_delay)
1707                 goto out; /* short path */
1708
1709         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1710         /* update delay with exact number of samples played */
1711         if (processed > subs->last_delay)
1712                 subs->last_delay = 0;
1713         else
1714                 subs->last_delay -= processed;
1715         runtime->delay = subs->last_delay;
1716
1717         /*
1718          * Report when delay estimate is off by more than 2ms.
1719          * The error should be lower than 2ms since the estimate relies
1720          * on two reads of a counter updated every ms.
1721          */
1722         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1723                 dev_dbg_ratelimited(&subs->dev->dev,
1724                         "delay: estimated %d, actual %d\n",
1725                         est_delay, subs->last_delay);
1726
1727         if (!subs->running) {
1728                 /* update last_frame_number for delay counting here since
1729                  * prepare_playback_urb won't be called during pause
1730                  */
1731                 subs->last_frame_number =
1732                         usb_get_current_frame_number(subs->dev) & 0xff;
1733         }
1734
1735  out:
1736         spin_unlock_irqrestore(&subs->lock, flags);
1737 }
1738
1739 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1740                                               int cmd)
1741 {
1742         struct snd_usb_substream *subs = substream->runtime->private_data;
1743
1744         switch (cmd) {
1745         case SNDRV_PCM_TRIGGER_START:
1746                 subs->trigger_tstamp_pending_update = true;
1747                 fallthrough;
1748         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1749                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1750                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1751                 subs->running = 1;
1752                 return 0;
1753         case SNDRV_PCM_TRIGGER_STOP:
1754                 stop_endpoints(subs);
1755                 subs->running = 0;
1756                 return 0;
1757         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1758                 subs->data_endpoint->prepare_data_urb = NULL;
1759                 /* keep retire_data_urb for delay calculation */
1760                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1761                 subs->running = 0;
1762                 return 0;
1763         case SNDRV_PCM_TRIGGER_SUSPEND:
1764                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1765                         stop_endpoints(subs);
1766                         subs->need_setup_fmt = true;
1767                         return 0;
1768                 }
1769                 break;
1770         }
1771
1772         return -EINVAL;
1773 }
1774
1775 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1776                                              int cmd)
1777 {
1778         int err;
1779         struct snd_usb_substream *subs = substream->runtime->private_data;
1780
1781         switch (cmd) {
1782         case SNDRV_PCM_TRIGGER_START:
1783                 err = start_endpoints(subs);
1784                 if (err < 0)
1785                         return err;
1786
1787                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1788                 subs->running = 1;
1789                 return 0;
1790         case SNDRV_PCM_TRIGGER_STOP:
1791                 stop_endpoints(subs);
1792                 subs->data_endpoint->retire_data_urb = NULL;
1793                 subs->running = 0;
1794                 return 0;
1795         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1796                 subs->data_endpoint->retire_data_urb = NULL;
1797                 subs->running = 0;
1798                 return 0;
1799         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1800                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1801                 subs->running = 1;
1802                 return 0;
1803         case SNDRV_PCM_TRIGGER_SUSPEND:
1804                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1805                         stop_endpoints(subs);
1806                         subs->need_setup_fmt = true;
1807                         return 0;
1808                 }
1809                 break;
1810         }
1811
1812         return -EINVAL;
1813 }
1814
1815 static const struct snd_pcm_ops snd_usb_playback_ops = {
1816         .open =         snd_usb_pcm_open,
1817         .close =        snd_usb_pcm_close,
1818         .hw_params =    snd_usb_hw_params,
1819         .hw_free =      snd_usb_hw_free,
1820         .prepare =      snd_usb_pcm_prepare,
1821         .trigger =      snd_usb_substream_playback_trigger,
1822         .sync_stop =    snd_usb_pcm_sync_stop,
1823         .pointer =      snd_usb_pcm_pointer,
1824 };
1825
1826 static const struct snd_pcm_ops snd_usb_capture_ops = {
1827         .open =         snd_usb_pcm_open,
1828         .close =        snd_usb_pcm_close,
1829         .hw_params =    snd_usb_hw_params,
1830         .hw_free =      snd_usb_hw_free,
1831         .prepare =      snd_usb_pcm_prepare,
1832         .trigger =      snd_usb_substream_capture_trigger,
1833         .sync_stop =    snd_usb_pcm_sync_stop,
1834         .pointer =      snd_usb_pcm_pointer,
1835 };
1836
1837 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1838 {
1839         const struct snd_pcm_ops *ops;
1840
1841         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1842                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1843         snd_pcm_set_ops(pcm, stream, ops);
1844 }
1845
1846 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1847 {
1848         struct snd_pcm *pcm = subs->stream->pcm;
1849         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1850         struct device *dev = subs->dev->bus->controller;
1851
1852         if (snd_usb_use_vmalloc)
1853                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1854                                            NULL, 0, 0);
1855         else
1856                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1857                                            dev, 64*1024, 512*1024);
1858 }