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(0x0499, 0x172f): /* Steinberg UR22C */
 373         case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
 374                 ep = 0x81;
 375                 ifnum = 2;
 376                 goto add_sync_ep_from_ifnum;
 377         case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 378         case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
 379                 ep = 0x82;
 380                 ifnum = 0;
 381                 goto add_sync_ep_from_ifnum;
 382         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 383                 /* BOSS Katana amplifiers do not need quirks */
 384                 return 0;
 385         }
 386
 387         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 388             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 389             altsd->bInterfaceProtocol == 2 &&
 390             altsd->bNumEndpoints == 1 &&
 391             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 392             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 393                                       altsd->bAlternateSetting,
 394                                       &alts, &ep) >= 0) {
 395                 goto add_sync_ep;
 396         }
 397
 398         /* No quirk */
 399         return 0;
 400
 401 add_sync_ep_from_ifnum:
 402         iface = usb_ifnum_to_if(dev, ifnum);
 403
 404         if (!iface || iface->num_altsetting < 2)
 405                 return -EINVAL;
 406
 407         alts = &iface->altsetting[1];
 408
 409 add_sync_ep:
 410         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 411                                                    alts, ep, !subs->direction,
 412                                                    SND_USB_ENDPOINT_TYPE_DATA);
 413         if (!subs->sync_endpoint)
 414                 return -EINVAL;
 415
 416         subs->sync_endpoint->is_implicit_feedback = 1;
 417
 418         subs->data_endpoint->sync_master = subs->sync_endpoint;
 419
 420         return 1;
 421 }
 422
 423 static int set_sync_endpoint(struct snd_usb_substream *subs,
 424                              struct audioformat *fmt,
 425                              struct usb_device *dev,
 426                              struct usb_host_interface *alts,
 427                              struct usb_interface_descriptor *altsd)
 428 {
 429         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 430         unsigned int ep, attr;
 431         bool implicit_fb;
 432         int err;
 433
 434         /* we need a sync pipe in async OUT or adaptive IN mode */
 435         /* check the number of EP, since some devices have broken
 436          * descriptors which fool us.  if it has only one EP,
 437          * assume it as adaptive-out or sync-in.
 438          */
 439         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 440
 441         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 442                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 443
 444                 /*
 445                  * In these modes the notion of sync_endpoint is irrelevant.
 446                  * Reset pointers to avoid using stale data from previously
 447                  * used settings, e.g. when configuration and endpoints were
 448                  * changed
 449                  */
 450
 451                 subs->sync_endpoint = NULL;
 452                 subs->data_endpoint->sync_master = NULL;
 453         }
 454
 455         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 456         if (err < 0)
 457                 return err;
 458
 459         /* endpoint set by quirk */
 460         if (err > 0)
 461                 return 0;
 462
 463         if (altsd->bNumEndpoints < 2)
 464                 return 0;
 465
 466         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 467                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 468             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 469                 return 0;
 470
 471         /*
 472          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 473          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 474          * error fall back to SYNC mode and don't create sync endpoint
 475          */
 476
 477         /* check sync-pipe endpoint */
 478         /* ... and check descriptor size before accessing bSynchAddress
 479            because there is a version of the SB Audigy 2 NX firmware lacking
 480            the audio fields in the endpoint descriptors */
 481         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 482             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 483              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 484                 dev_err(&dev->dev,
 485                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 486                            fmt->iface, fmt->altsetting,
 487                            get_endpoint(alts, 1)->bmAttributes,
 488                            get_endpoint(alts, 1)->bLength,
 489                            get_endpoint(alts, 1)->bSynchAddress);
 490                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 491                         return 0;
 492                 return -EINVAL;
 493         }
 494         ep = get_endpoint(alts, 1)->bEndpointAddress;
 495         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 496             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 497             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 498              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 499                 dev_err(&dev->dev,
 500                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 501                            fmt->iface, fmt->altsetting,
 502                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 503                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 504                         return 0;
 505                 return -EINVAL;
 506         }
 507
 508         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 509                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 510
 511         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 512                                                    alts, ep, !subs->direction,
 513                                                    implicit_fb ?
 514                                                         SND_USB_ENDPOINT_TYPE_DATA :
 515                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 516
 517         if (!subs->sync_endpoint) {
 518                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 519                         return 0;
 520                 return -EINVAL;
 521         }
 522
 523         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 524
 525         subs->data_endpoint->sync_master = subs->sync_endpoint;
 526
 527         return 0;
 528 }
 529
 530 /*
 531  * find a matching format and set up the interface
 532  */
 533 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 534 {
 535         struct usb_device *dev = subs->dev;
 536         struct usb_host_interface *alts;
 537         struct usb_interface_descriptor *altsd;
 538         struct usb_interface *iface;
 539         int err;
 540
 541         iface = usb_ifnum_to_if(dev, fmt->iface);
 542         if (WARN_ON(!iface))
 543                 return -EINVAL;
 544         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 545         if (WARN_ON(!alts))
 546                 return -EINVAL;
 547         altsd = get_iface_desc(alts);
 548
 549         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 550                 return 0;
 551
 552         /* close the old interface */
 553         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 554                 if (!subs->stream->chip->keep_iface) {
 555                         err = usb_set_interface(subs->dev, subs->interface, 0);
 556                         if (err < 0) {
 557                                 dev_err(&dev->dev,
 558                                         "%d:%d: return to setting 0 failed (%d)\n",
 559                                         fmt->iface, fmt->altsetting, err);
 560                                 return -EIO;
 561                         }
 562                 }
 563                 subs->interface = -1;
 564                 subs->altset_idx = 0;
 565         }
 566
 567         if (subs->need_setup_fmt)
 568                 subs->need_setup_fmt = false;
 569
 570         /* set interface */
 571         if (iface->cur_altsetting != alts) {
 572                 err = snd_usb_select_mode_quirk(subs, fmt);
 573                 if (err < 0)
 574                         return -EIO;
 575
 576                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 577                 if (err < 0) {
 578                         dev_err(&dev->dev,
 579                                 "%d:%d: usb_set_interface failed (%d)\n",
 580                                 fmt->iface, fmt->altsetting, err);
 581                         return -EIO;
 582                 }
 583                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 584                         fmt->iface, fmt->altsetting);
 585                 snd_usb_set_interface_quirk(dev);
 586         }
 587
 588         subs->interface = fmt->iface;
 589         subs->altset_idx = fmt->altset_idx;
 590         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 591                                                    alts, fmt->endpoint, subs->direction,
 592                                                    SND_USB_ENDPOINT_TYPE_DATA);
 593
 594         if (!subs->data_endpoint)
 595                 return -EINVAL;
 596
 597         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 598         if (err < 0)
 599                 return err;
 600
 601         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 602         if (err < 0)
 603                 return err;
 604
 605         subs->cur_audiofmt = fmt;
 606
 607         snd_usb_set_format_quirk(subs, fmt);
 608
 609         return 0;
 610 }
 611
 612 /*
 613  * Return the score of matching two audioformats.
 614  * Veto the audioformat if:
 615  * - It has no channels for some reason.
 616  * - Requested PCM format is not supported.
 617  * - Requested sample rate is not supported.
 618  */
 619 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 620                                        struct audioformat *fp,
 621                                        struct audioformat *match, int rate,
 622                                        snd_pcm_format_t pcm_format)
 623 {
 624         int i;
 625         int score = 0;
 626
 627         if (fp->channels < 1) {
 628                 dev_dbg(&subs->dev->dev,
 629                         "%s: (fmt @%p) no channels\n", __func__, fp);
 630                 return 0;
 631         }
 632
 633         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 634                 dev_dbg(&subs->dev->dev,
 635                         "%s: (fmt @%p) no match for format %d\n", __func__,
 636                         fp, pcm_format);
 637                 return 0;
 638         }
 639
 640         for (i = 0; i < fp->nr_rates; i++) {
 641                 if (fp->rate_table[i] == rate) {
 642                         score++;
 643                         break;
 644                 }
 645         }
 646         if (!score) {
 647                 dev_dbg(&subs->dev->dev,
 648                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 649                         fp, rate);
 650                 return 0;
 651         }
 652
 653         if (fp->channels == match->channels)
 654                 score++;
 655
 656         dev_dbg(&subs->dev->dev,
 657                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 658
 659         return score;
 660 }
 661
 662 /*
 663  * Configure the sync ep using the rate and pcm format of the data ep.
 664  */
 665 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 666 {
 667         int ret;
 668         struct audioformat *fp;
 669         struct audioformat *sync_fp = NULL;
 670         int cur_score = 0;
 671         int sync_period_bytes = subs->period_bytes;
 672         struct snd_usb_substream *sync_subs =
 673                 &subs->stream->substream[subs->direction ^ 1];
 674
 675         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 676             !subs->stream)
 677                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 678                                                    subs->pcm_format,
 679                                                    subs->channels,
 680                                                    subs->period_bytes,
 681                                                    0, 0,
 682                                                    subs->cur_rate,
 683                                                    subs->cur_audiofmt,
 684                                                    NULL);
 685
 686         /* Try to find the best matching audioformat. */
 687         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 688                 int score = match_endpoint_audioformats(subs,
 689                                                         fp, subs->cur_audiofmt,
 690                         subs->cur_rate, subs->pcm_format);
 691
 692                 if (score > cur_score) {
 693                         sync_fp = fp;
 694                         cur_score = score;
 695                 }
 696         }
 697
 698         if (unlikely(sync_fp == NULL)) {
 699                 dev_err(&subs->dev->dev,
 700                         "%s: no valid audioformat for sync ep %x found\n",
 701                         __func__, sync_subs->ep_num);
 702                 return -EINVAL;
 703         }
 704
 705         /*
 706          * Recalculate the period bytes if channel number differ between
 707          * data and sync ep audioformat.
 708          */
 709         if (sync_fp->channels != subs->channels) {
 710                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 711                         sync_fp->channels;
 712                 dev_dbg(&subs->dev->dev,
 713                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 714                         __func__, subs->period_bytes, sync_period_bytes);
 715         }
 716
 717         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 718                                           subs->pcm_format,
 719                                           sync_fp->channels,
 720                                           sync_period_bytes,
 721                                           0, 0,
 722                                           subs->cur_rate,
 723                                           sync_fp,
 724                                           NULL);
 725
 726         return ret;
 727 }
 728
 729 /*
 730  * configure endpoint params
 731  *
 732  * called  during initial setup and upon resume
 733  */
 734 static int configure_endpoint(struct snd_usb_substream *subs)
 735 {
 736         int ret;
 737
 738         /* format changed */
 739         stop_endpoints(subs);
 740         sync_pending_stops(subs);
 741         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 742                                           subs->pcm_format,
 743                                           subs->channels,
 744                                           subs->period_bytes,
 745                                           subs->period_frames,
 746                                           subs->buffer_periods,
 747                                           subs->cur_rate,
 748                                           subs->cur_audiofmt,
 749                                           subs->sync_endpoint);
 750         if (ret < 0)
 751                 return ret;
 752
 753         if (subs->sync_endpoint)
 754                 ret = configure_sync_endpoint(subs);
 755
 756         return ret;
 757 }
 758
 759 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 760 {
 761         int ret;
 762
 763         if (!subs->str_pd)
 764                 return 0;
 765
 766         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 767         if (ret < 0) {
 768                 dev_err(&subs->dev->dev,
 769                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 770                         subs->str_pd->pd_id, state, ret);
 771                 return ret;
 772         }
 773
 774         return 0;
 775 }
 776
 777 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 778 {
 779         int ret;
 780
 781         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 782         if (ret < 0)
 783                 return ret;
 784
 785         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 786         if (ret < 0)
 787                 return ret;
 788
 789         return 0;
 790 }
 791
 792 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 793 {
 794         int ret;
 795
 796         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 797         if (ret < 0)
 798                 return ret;
 799
 800         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 801         if (ret < 0)
 802                 return ret;
 803
 804         return 0;
 805 }
 806
 807 /*
 808  * hw_params callback
 809  *
 810  * allocate a buffer and set the given audio format.
 811  *
 812  * so far we use a physically linear buffer although packetize transfer
 813  * doesn't need a continuous area.
 814  * if sg buffer is supported on the later version of alsa, we'll follow
 815  * that.
 816  */
 817 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 818                              struct snd_pcm_hw_params *hw_params)
 819 {
 820         struct snd_usb_substream *subs = substream->runtime->private_data;
 821         struct audioformat *fmt;
 822         int ret;
 823
 824         ret = snd_media_start_pipeline(subs);
 825         if (ret)
 826                 return ret;
 827
 828         subs->pcm_format = params_format(hw_params);
 829         subs->period_bytes = params_period_bytes(hw_params);
 830         subs->period_frames = params_period_size(hw_params);
 831         subs->buffer_periods = params_periods(hw_params);
 832         subs->channels = params_channels(hw_params);
 833         subs->cur_rate = params_rate(hw_params);
 834
 835         fmt = find_format(subs);
 836         if (!fmt) {
 837                 dev_dbg(&subs->dev->dev,
 838                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 839                            subs->pcm_format, subs->cur_rate, subs->channels);
 840                 ret = -EINVAL;
 841                 goto stop_pipeline;
 842         }
 843
 844         ret = snd_usb_lock_shutdown(subs->stream->chip);
 845         if (ret < 0)
 846                 goto stop_pipeline;
 847
 848         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 849         if (ret < 0)
 850                 goto unlock;
 851
 852         ret = set_format(subs, fmt);
 853         if (ret < 0)
 854                 goto unlock;
 855
 856         subs->interface = fmt->iface;
 857         subs->altset_idx = fmt->altset_idx;
 858         subs->need_setup_ep = true;
 859
 860  unlock:
 861         snd_usb_unlock_shutdown(subs->stream->chip);
 862         if (ret < 0)
 863                 goto stop_pipeline;
 864         return ret;
 865
 866  stop_pipeline:
 867         snd_media_stop_pipeline(subs);
 868         return ret;
 869 }
 870
 871 /*
 872  * hw_free callback
 873  *
 874  * reset the audio format and release the buffer
 875  */
 876 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 877 {
 878         struct snd_usb_substream *subs = substream->runtime->private_data;
 879
 880         snd_media_stop_pipeline(subs);
 881         subs->cur_audiofmt = NULL;
 882         subs->cur_rate = 0;
 883         subs->period_bytes = 0;
 884         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 885                 stop_endpoints(subs);
 886                 sync_pending_stops(subs);
 887                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 888                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 889                 snd_usb_unlock_shutdown(subs->stream->chip);
 890         }
 891
 892         return 0;
 893 }
 894
 895 /*
 896  * prepare callback
 897  *
 898  * only a few subtle things...
 899  */
 900 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 901 {
 902         struct snd_pcm_runtime *runtime = substream->runtime;
 903         struct snd_usb_substream *subs = runtime->private_data;
 904         struct usb_host_interface *alts;
 905         struct usb_interface *iface;
 906         int ret;
 907
 908         if (! subs->cur_audiofmt) {
 909                 dev_err(&subs->dev->dev, "no format is specified!\n");
 910                 return -ENXIO;
 911         }
 912
 913         ret = snd_usb_lock_shutdown(subs->stream->chip);
 914         if (ret < 0)
 915                 return ret;
 916         if (snd_BUG_ON(!subs->data_endpoint)) {
 917                 ret = -EIO;
 918                 goto unlock;
 919         }
 920
 921         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 922         if (ret < 0)
 923                 goto unlock;
 924
 925         ret = set_format(subs, subs->cur_audiofmt);
 926         if (ret < 0)
 927                 goto unlock;
 928
 929         if (subs->need_setup_ep) {
 930
 931                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 932                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 933                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 934                                                subs->cur_audiofmt->iface,
 935                                                alts,
 936                                                subs->cur_audiofmt,
 937                                                subs->cur_rate);
 938                 if (ret < 0)
 939                         goto unlock;
 940
 941                 ret = configure_endpoint(subs);
 942                 if (ret < 0)
 943                         goto unlock;
 944                 subs->need_setup_ep = false;
 945         }
 946
 947         /* some unit conversions in runtime */
 948         subs->data_endpoint->maxframesize =
 949                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 950         subs->data_endpoint->curframesize =
 951                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 952
 953         /* reset the pointer */
 954         subs->hwptr_done = 0;
 955         subs->transfer_done = 0;
 956         subs->last_delay = 0;
 957         subs->last_frame_number = 0;
 958         runtime->delay = 0;
 959
 960         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 961          * updates for all URBs would happen at the same time when starting */
 962         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 963                 ret = start_endpoints(subs);
 964
 965  unlock:
 966         snd_usb_unlock_shutdown(subs->stream->chip);
 967         return ret;
 968 }
 969
 970 static const struct snd_pcm_hardware snd_usb_hardware =
 971 {
 972         .info =                 SNDRV_PCM_INFO_MMAP |
 973                                 SNDRV_PCM_INFO_MMAP_VALID |
 974                                 SNDRV_PCM_INFO_BATCH |
 975                                 SNDRV_PCM_INFO_INTERLEAVED |
 976                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 977                                 SNDRV_PCM_INFO_PAUSE,
 978         .buffer_bytes_max =     1024 * 1024,
 979         .period_bytes_min =     64,
 980         .period_bytes_max =     512 * 1024,
 981         .periods_min =          2,
 982         .periods_max =          1024,
 983 };
 984
 985 static int hw_check_valid_format(struct snd_usb_substream *subs,
 986                                  struct snd_pcm_hw_params *params,
 987                                  struct audioformat *fp)
 988 {
 989         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 990         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 991         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 992         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 993         struct snd_mask check_fmts;
 994         unsigned int ptime;
 995
 996         /* check the format */
 997         snd_mask_none(&check_fmts);
 998         check_fmts.bits[0] = (u32)fp->formats;
 999         check_fmts.bits[1] = (u32)(fp->formats >> 32);
1000         snd_mask_intersect(&check_fmts, fmts);
1001         if (snd_mask_empty(&check_fmts)) {
1002                 hwc_debug("   > check: no supported format %d\n", fp->format);
1003                 return 0;
1004         }
1005         /* check the channels */
1006         if (fp->channels < ct->min || fp->channels > ct->max) {
1007                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1008                 return 0;
1009         }
1010         /* check the rate is within the range */
1011         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1012                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1013                 return 0;
1014         }
1015         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1016                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1017                 return 0;
1018         }
1019         /* check whether the period time is >= the data packet interval */
1020         if (subs->speed != USB_SPEED_FULL) {
1021                 ptime = 125 * (1 << fp->datainterval);
1022                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1023                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1024                         return 0;
1025                 }
1026         }
1027         return 1;
1028 }
1029
1030 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1031                         struct snd_pcm_hw_rule *rule)
1032 {
1033         struct snd_usb_substream *subs = rule->private;
1034         struct audioformat *fp;
1035         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1036         unsigned int rmin, rmax;
1037         int changed;
1038
1039         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1040         changed = 0;
1041         rmin = rmax = 0;
1042         list_for_each_entry(fp, &subs->fmt_list, list) {
1043                 if (!hw_check_valid_format(subs, params, fp))
1044                         continue;
1045                 if (changed++) {
1046                         if (rmin > fp->rate_min)
1047                                 rmin = fp->rate_min;
1048                         if (rmax < fp->rate_max)
1049                                 rmax = fp->rate_max;
1050                 } else {
1051                         rmin = fp->rate_min;
1052                         rmax = fp->rate_max;
1053                 }
1054         }
1055
1056         if (!changed) {
1057                 hwc_debug("  --> get empty\n");
1058                 it->empty = 1;
1059                 return -EINVAL;
1060         }
1061
1062         changed = 0;
1063         if (it->min < rmin) {
1064                 it->min = rmin;
1065                 it->openmin = 0;
1066                 changed = 1;
1067         }
1068         if (it->max > rmax) {
1069                 it->max = rmax;
1070                 it->openmax = 0;
1071                 changed = 1;
1072         }
1073         if (snd_interval_checkempty(it)) {
1074                 it->empty = 1;
1075                 return -EINVAL;
1076         }
1077         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1078         return changed;
1079 }
1080
1081
1082 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1083                             struct snd_pcm_hw_rule *rule)
1084 {
1085         struct snd_usb_substream *subs = rule->private;
1086         struct audioformat *fp;
1087         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1088         unsigned int rmin, rmax;
1089         int changed;
1090
1091         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1092         changed = 0;
1093         rmin = rmax = 0;
1094         list_for_each_entry(fp, &subs->fmt_list, list) {
1095                 if (!hw_check_valid_format(subs, params, fp))
1096                         continue;
1097                 if (changed++) {
1098                         if (rmin > fp->channels)
1099                                 rmin = fp->channels;
1100                         if (rmax < fp->channels)
1101                                 rmax = fp->channels;
1102                 } else {
1103                         rmin = fp->channels;
1104                         rmax = fp->channels;
1105                 }
1106         }
1107
1108         if (!changed) {
1109                 hwc_debug("  --> get empty\n");
1110                 it->empty = 1;
1111                 return -EINVAL;
1112         }
1113
1114         changed = 0;
1115         if (it->min < rmin) {
1116                 it->min = rmin;
1117                 it->openmin = 0;
1118                 changed = 1;
1119         }
1120         if (it->max > rmax) {
1121                 it->max = rmax;
1122                 it->openmax = 0;
1123                 changed = 1;
1124         }
1125         if (snd_interval_checkempty(it)) {
1126                 it->empty = 1;
1127                 return -EINVAL;
1128         }
1129         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1130         return changed;
1131 }
1132
1133 static int hw_rule_format(struct snd_pcm_hw_params *params,
1134                           struct snd_pcm_hw_rule *rule)
1135 {
1136         struct snd_usb_substream *subs = rule->private;
1137         struct audioformat *fp;
1138         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1139         u64 fbits;
1140         u32 oldbits[2];
1141         int changed;
1142
1143         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1144         fbits = 0;
1145         list_for_each_entry(fp, &subs->fmt_list, list) {
1146                 if (!hw_check_valid_format(subs, params, fp))
1147                         continue;
1148                 fbits |= fp->formats;
1149         }
1150
1151         oldbits[0] = fmt->bits[0];
1152         oldbits[1] = fmt->bits[1];
1153         fmt->bits[0] &= (u32)fbits;
1154         fmt->bits[1] &= (u32)(fbits >> 32);
1155         if (!fmt->bits[0] && !fmt->bits[1]) {
1156                 hwc_debug("  --> get empty\n");
1157                 return -EINVAL;
1158         }
1159         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1160         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1161         return changed;
1162 }
1163
1164 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1165                                struct snd_pcm_hw_rule *rule)
1166 {
1167         struct snd_usb_substream *subs = rule->private;
1168         struct audioformat *fp;
1169         struct snd_interval *it;
1170         unsigned char min_datainterval;
1171         unsigned int pmin;
1172         int changed;
1173
1174         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1175         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1176         min_datainterval = 0xff;
1177         list_for_each_entry(fp, &subs->fmt_list, list) {
1178                 if (!hw_check_valid_format(subs, params, fp))
1179                         continue;
1180                 min_datainterval = min(min_datainterval, fp->datainterval);
1181         }
1182         if (min_datainterval == 0xff) {
1183                 hwc_debug("  --> get empty\n");
1184                 it->empty = 1;
1185                 return -EINVAL;
1186         }
1187         pmin = 125 * (1 << min_datainterval);
1188         changed = 0;
1189         if (it->min < pmin) {
1190                 it->min = pmin;
1191                 it->openmin = 0;
1192                 changed = 1;
1193         }
1194         if (snd_interval_checkempty(it)) {
1195                 it->empty = 1;
1196                 return -EINVAL;
1197         }
1198         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1199         return changed;
1200 }
1201
1202 /*
1203  *  If the device supports unusual bit rates, does the request meet these?
1204  */
1205 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1206                                   struct snd_usb_substream *subs)
1207 {
1208         struct audioformat *fp;
1209         int *rate_list;
1210         int count = 0, needs_knot = 0;
1211         int err;
1212
1213         kfree(subs->rate_list.list);
1214         subs->rate_list.list = NULL;
1215
1216         list_for_each_entry(fp, &subs->fmt_list, list) {
1217                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1218                         return 0;
1219                 count += fp->nr_rates;
1220                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1221                         needs_knot = 1;
1222         }
1223         if (!needs_knot)
1224                 return 0;
1225
1226         subs->rate_list.list = rate_list =
1227                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1228         if (!subs->rate_list.list)
1229                 return -ENOMEM;
1230         subs->rate_list.count = count;
1231         subs->rate_list.mask = 0;
1232         count = 0;
1233         list_for_each_entry(fp, &subs->fmt_list, list) {
1234                 int i;
1235                 for (i = 0; i < fp->nr_rates; i++)
1236                         rate_list[count++] = fp->rate_table[i];
1237         }
1238         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1239                                          &subs->rate_list);
1240         if (err < 0)
1241                 return err;
1242
1243         return 0;
1244 }
1245
1246
1247 /*
1248  * set up the runtime hardware information.
1249  */
1250
1251 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1252 {
1253         struct audioformat *fp;
1254         unsigned int pt, ptmin;
1255         int param_period_time_if_needed;
1256         int err;
1257
1258         runtime->hw.formats = subs->formats;
1259
1260         runtime->hw.rate_min = 0x7fffffff;
1261         runtime->hw.rate_max = 0;
1262         runtime->hw.channels_min = 256;
1263         runtime->hw.channels_max = 0;
1264         runtime->hw.rates = 0;
1265         ptmin = UINT_MAX;
1266         /* check min/max rates and channels */
1267         list_for_each_entry(fp, &subs->fmt_list, list) {
1268                 runtime->hw.rates |= fp->rates;
1269                 if (runtime->hw.rate_min > fp->rate_min)
1270                         runtime->hw.rate_min = fp->rate_min;
1271                 if (runtime->hw.rate_max < fp->rate_max)
1272                         runtime->hw.rate_max = fp->rate_max;
1273                 if (runtime->hw.channels_min > fp->channels)
1274                         runtime->hw.channels_min = fp->channels;
1275                 if (runtime->hw.channels_max < fp->channels)
1276                         runtime->hw.channels_max = fp->channels;
1277                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1278                         /* FIXME: there might be more than one audio formats... */
1279                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1280                                 fp->frame_size;
1281                 }
1282                 pt = 125 * (1 << fp->datainterval);
1283                 ptmin = min(ptmin, pt);
1284         }
1285
1286         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1287         if (subs->speed == USB_SPEED_FULL)
1288                 /* full speed devices have fixed data packet interval */
1289                 ptmin = 1000;
1290         if (ptmin == 1000)
1291                 /* if period time doesn't go below 1 ms, no rules needed */
1292                 param_period_time_if_needed = -1;
1293
1294         err = snd_pcm_hw_constraint_minmax(runtime,
1295                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1296                                            ptmin, UINT_MAX);
1297         if (err < 0)
1298                 return err;
1299
1300         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1301                                   hw_rule_rate, subs,
1302                                   SNDRV_PCM_HW_PARAM_FORMAT,
1303                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1304                                   param_period_time_if_needed,
1305                                   -1);
1306         if (err < 0)
1307                 return err;
1308         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1309                                   hw_rule_channels, subs,
1310                                   SNDRV_PCM_HW_PARAM_FORMAT,
1311                                   SNDRV_PCM_HW_PARAM_RATE,
1312                                   param_period_time_if_needed,
1313                                   -1);
1314         if (err < 0)
1315                 return err;
1316         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1317                                   hw_rule_format, subs,
1318                                   SNDRV_PCM_HW_PARAM_RATE,
1319                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1320                                   param_period_time_if_needed,
1321                                   -1);
1322         if (err < 0)
1323                 return err;
1324         if (param_period_time_if_needed >= 0) {
1325                 err = snd_pcm_hw_rule_add(runtime, 0,
1326                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1327                                           hw_rule_period_time, subs,
1328                                           SNDRV_PCM_HW_PARAM_FORMAT,
1329                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1330                                           SNDRV_PCM_HW_PARAM_RATE,
1331                                           -1);
1332                 if (err < 0)
1333                         return err;
1334         }
1335         err = snd_usb_pcm_check_knot(runtime, subs);
1336         if (err < 0)
1337                 return err;
1338
1339         return snd_usb_autoresume(subs->stream->chip);
1340 }
1341
1342 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1343 {
1344         int direction = substream->stream;
1345         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1346         struct snd_pcm_runtime *runtime = substream->runtime;
1347         struct snd_usb_substream *subs = &as->substream[direction];
1348         int ret;
1349
1350         subs->interface = -1;
1351         subs->altset_idx = 0;
1352         runtime->hw = snd_usb_hardware;
1353         runtime->private_data = subs;
1354         subs->pcm_substream = substream;
1355         /* runtime PM is also done there */
1356
1357         /* initialize DSD/DOP context */
1358         subs->dsd_dop.byte_idx = 0;
1359         subs->dsd_dop.channel = 0;
1360         subs->dsd_dop.marker = 1;
1361
1362         ret = setup_hw_info(runtime, subs);
1363         if (ret == 0) {
1364                 ret = snd_media_stream_init(subs, as->pcm, direction);
1365                 if (ret)
1366                         snd_usb_autosuspend(subs->stream->chip);
1367         }
1368         return ret;
1369 }
1370
1371 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1372 {
1373         int direction = substream->stream;
1374         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1375         struct snd_usb_substream *subs = &as->substream[direction];
1376         int ret;
1377
1378         snd_media_stop_pipeline(subs);
1379
1380         if (!as->chip->keep_iface &&
1381             subs->interface >= 0 &&
1382             !snd_usb_lock_shutdown(subs->stream->chip)) {
1383                 usb_set_interface(subs->dev, subs->interface, 0);
1384                 subs->interface = -1;
1385                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1386                 snd_usb_unlock_shutdown(subs->stream->chip);
1387                 if (ret < 0)
1388                         return ret;
1389         }
1390
1391         subs->pcm_substream = NULL;
1392         snd_usb_autosuspend(subs->stream->chip);
1393
1394         return 0;
1395 }
1396
1397 /* Since a URB can handle only a single linear buffer, we must use double
1398  * buffering when the data to be transferred overflows the buffer boundary.
1399  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1400  * for all URBs.
1401  */
1402 static void retire_capture_urb(struct snd_usb_substream *subs,
1403                                struct urb *urb)
1404 {
1405         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1406         unsigned int stride, frames, bytes, oldptr;
1407         int i, period_elapsed = 0;
1408         unsigned long flags;
1409         unsigned char *cp;
1410         int current_frame_number;
1411
1412         /* read frame number here, update pointer in critical section */
1413         current_frame_number = usb_get_current_frame_number(subs->dev);
1414
1415         stride = runtime->frame_bits >> 3;
1416
1417         for (i = 0; i < urb->number_of_packets; i++) {
1418                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1419                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1420                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1421                                 i, urb->iso_frame_desc[i].status);
1422                         // continue;
1423                 }
1424                 bytes = urb->iso_frame_desc[i].actual_length;
1425                 if (subs->stream_offset_adj > 0) {
1426                         unsigned int adj = min(subs->stream_offset_adj, bytes);
1427                         cp += adj;
1428                         bytes -= adj;
1429                         subs->stream_offset_adj -= adj;
1430                 }
1431                 frames = bytes / stride;
1432                 if (!subs->txfr_quirk)
1433                         bytes = frames * stride;
1434                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1435                         int oldbytes = bytes;
1436                         bytes = frames * stride;
1437                         dev_warn_ratelimited(&subs->dev->dev,
1438                                  "Corrected urb data len. %d->%d\n",
1439                                                         oldbytes, bytes);
1440                 }
1441                 /* update the current pointer */
1442                 spin_lock_irqsave(&subs->lock, flags);
1443                 oldptr = subs->hwptr_done;
1444                 subs->hwptr_done += bytes;
1445                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1446                         subs->hwptr_done -= runtime->buffer_size * stride;
1447                 frames = (bytes + (oldptr % stride)) / stride;
1448                 subs->transfer_done += frames;
1449                 if (subs->transfer_done >= runtime->period_size) {
1450                         subs->transfer_done -= runtime->period_size;
1451                         period_elapsed = 1;
1452                 }
1453                 /* capture delay is by construction limited to one URB,
1454                  * reset delays here
1455                  */
1456                 runtime->delay = subs->last_delay = 0;
1457
1458                 /* realign last_frame_number */
1459                 subs->last_frame_number = current_frame_number;
1460                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1461
1462                 spin_unlock_irqrestore(&subs->lock, flags);
1463                 /* copy a data chunk */
1464                 if (oldptr + bytes > runtime->buffer_size * stride) {
1465                         unsigned int bytes1 =
1466                                         runtime->buffer_size * stride - oldptr;
1467                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1468                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1469                 } else {
1470                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1471                 }
1472         }
1473
1474         if (period_elapsed)
1475                 snd_pcm_period_elapsed(subs->pcm_substream);
1476 }
1477
1478 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1479                                              struct urb *urb, unsigned int bytes)
1480 {
1481         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1482         unsigned int stride = runtime->frame_bits >> 3;
1483         unsigned int dst_idx = 0;
1484         unsigned int src_idx = subs->hwptr_done;
1485         unsigned int wrap = runtime->buffer_size * stride;
1486         u8 *dst = urb->transfer_buffer;
1487         u8 *src = runtime->dma_area;
1488         u8 marker[] = { 0x05, 0xfa };
1489
1490         /*
1491          * The DSP DOP format defines a way to transport DSD samples over
1492          * normal PCM data endpoints. It requires stuffing of marker bytes
1493          * (0x05 and 0xfa, alternating per sample frame), and then expects
1494          * 2 additional bytes of actual payload. The whole frame is stored
1495          * LSB.
1496          *
1497          * Hence, for a stereo transport, the buffer layout looks like this,
1498          * where L refers to left channel samples and R to right.
1499          *
1500          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1501          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1502          *   .....
1503          *
1504          */
1505
1506         while (bytes--) {
1507                 if (++subs->dsd_dop.byte_idx == 3) {
1508                         /* frame boundary? */
1509                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1510                         src_idx += 2;
1511                         subs->dsd_dop.byte_idx = 0;
1512
1513                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1514                                 /* alternate the marker */
1515                                 subs->dsd_dop.marker++;
1516                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1517                                 subs->dsd_dop.channel = 0;
1518                         }
1519                 } else {
1520                         /* stuff the DSD payload */
1521                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1522
1523                         if (subs->cur_audiofmt->dsd_bitrev)
1524                                 dst[dst_idx++] = bitrev8(src[idx]);
1525                         else
1526                                 dst[dst_idx++] = src[idx];
1527
1528                         subs->hwptr_done++;
1529                 }
1530         }
1531         if (subs->hwptr_done >= runtime->buffer_size * stride)
1532                 subs->hwptr_done -= runtime->buffer_size * stride;
1533 }
1534
1535 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1536                         int offset, int stride, unsigned int bytes)
1537 {
1538         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1539
1540         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1541                 /* err, the transferred area goes over buffer boundary. */
1542                 unsigned int bytes1 =
1543                         runtime->buffer_size * stride - subs->hwptr_done;
1544                 memcpy(urb->transfer_buffer + offset,
1545                        runtime->dma_area + subs->hwptr_done, bytes1);
1546                 memcpy(urb->transfer_buffer + offset + bytes1,
1547                        runtime->dma_area, bytes - bytes1);
1548         } else {
1549                 memcpy(urb->transfer_buffer + offset,
1550                        runtime->dma_area + subs->hwptr_done, bytes);
1551         }
1552         subs->hwptr_done += bytes;
1553         if (subs->hwptr_done >= runtime->buffer_size * stride)
1554                 subs->hwptr_done -= runtime->buffer_size * stride;
1555 }
1556
1557 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1558                                       struct urb *urb, int stride,
1559                                       unsigned int bytes)
1560 {
1561         __le32 packet_length;
1562         int i;
1563
1564         /* Put __le32 length descriptor at start of each packet. */
1565         for (i = 0; i < urb->number_of_packets; i++) {
1566                 unsigned int length = urb->iso_frame_desc[i].length;
1567                 unsigned int offset = urb->iso_frame_desc[i].offset;
1568
1569                 packet_length = cpu_to_le32(length);
1570                 offset += i * sizeof(packet_length);
1571                 urb->iso_frame_desc[i].offset = offset;
1572                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1573                 memcpy(urb->transfer_buffer + offset,
1574                        &packet_length, sizeof(packet_length));
1575                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1576                             stride, length);
1577         }
1578         /* Adjust transfer size accordingly. */
1579         bytes += urb->number_of_packets * sizeof(packet_length);
1580         return bytes;
1581 }
1582
1583 static void prepare_playback_urb(struct snd_usb_substream *subs,
1584                                  struct urb *urb)
1585 {
1586         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1587         struct snd_usb_endpoint *ep = subs->data_endpoint;
1588         struct snd_urb_ctx *ctx = urb->context;
1589         unsigned int counts, frames, bytes;
1590         int i, stride, period_elapsed = 0;
1591         unsigned long flags;
1592
1593         stride = runtime->frame_bits >> 3;
1594
1595         frames = 0;
1596         urb->number_of_packets = 0;
1597         spin_lock_irqsave(&subs->lock, flags);
1598         subs->frame_limit += ep->max_urb_frames;
1599         for (i = 0; i < ctx->packets; i++) {
1600                 if (ctx->packet_size[i])
1601                         counts = ctx->packet_size[i];
1602                 else if (ep->sync_master)
1603                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1604                 else
1605                         counts = snd_usb_endpoint_next_packet_size(ep);
1606
1607                 /* set up descriptor */
1608                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1609                 urb->iso_frame_desc[i].length = counts * ep->stride;
1610                 frames += counts;
1611                 urb->number_of_packets++;
1612                 subs->transfer_done += counts;
1613                 if (subs->transfer_done >= runtime->period_size) {
1614                         subs->transfer_done -= runtime->period_size;
1615                         subs->frame_limit = 0;
1616                         period_elapsed = 1;
1617                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1618                                 if (subs->transfer_done > 0) {
1619                                         /* FIXME: fill-max mode is not
1620                                          * supported yet */
1621                                         frames -= subs->transfer_done;
1622                                         counts -= subs->transfer_done;
1623                                         urb->iso_frame_desc[i].length =
1624                                                 counts * ep->stride;
1625                                         subs->transfer_done = 0;
1626                                 }
1627                                 i++;
1628                                 if (i < ctx->packets) {
1629                                         /* add a transfer delimiter */
1630                                         urb->iso_frame_desc[i].offset =
1631                                                 frames * ep->stride;
1632                                         urb->iso_frame_desc[i].length = 0;
1633                                         urb->number_of_packets++;
1634                                 }
1635                                 break;
1636                         }
1637                 }
1638                 /* finish at the period boundary or after enough frames */
1639                 if ((period_elapsed ||
1640                                 subs->transfer_done >= subs->frame_limit) &&
1641                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1642                         break;
1643         }
1644         bytes = frames * ep->stride;
1645
1646         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1647                      subs->cur_audiofmt->dsd_dop)) {
1648                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1649         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1650                            subs->cur_audiofmt->dsd_bitrev)) {
1651                 /* bit-reverse the bytes */
1652                 u8 *buf = urb->transfer_buffer;
1653                 for (i = 0; i < bytes; i++) {
1654                         int idx = (subs->hwptr_done + i)
1655                                 % (runtime->buffer_size * stride);
1656                         buf[i] = bitrev8(runtime->dma_area[idx]);
1657                 }
1658
1659                 subs->hwptr_done += bytes;
1660                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1661                         subs->hwptr_done -= runtime->buffer_size * stride;
1662         } else {
1663                 /* usual PCM */
1664                 if (!subs->tx_length_quirk)
1665                         copy_to_urb(subs, urb, 0, stride, bytes);
1666                 else
1667                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1668                         /* bytes is now amount of outgoing data */
1669         }
1670
1671         /* update delay with exact number of samples queued */
1672         runtime->delay = subs->last_delay;
1673         runtime->delay += frames;
1674         subs->last_delay = runtime->delay;
1675
1676         /* realign last_frame_number */
1677         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1678         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1679
1680         if (subs->trigger_tstamp_pending_update) {
1681                 /* this is the first actual URB submitted,
1682                  * update trigger timestamp to reflect actual start time
1683                  */
1684                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1685                 subs->trigger_tstamp_pending_update = false;
1686         }
1687
1688         spin_unlock_irqrestore(&subs->lock, flags);
1689         urb->transfer_buffer_length = bytes;
1690         if (period_elapsed)
1691                 snd_pcm_period_elapsed(subs->pcm_substream);
1692 }
1693
1694 /*
1695  * process after playback data complete
1696  * - decrease the delay count again
1697  */
1698 static void retire_playback_urb(struct snd_usb_substream *subs,
1699                                struct urb *urb)
1700 {
1701         unsigned long flags;
1702         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1703         struct snd_usb_endpoint *ep = subs->data_endpoint;
1704         int processed = urb->transfer_buffer_length / ep->stride;
1705         int est_delay;
1706
1707         /* ignore the delay accounting when processed=0 is given, i.e.
1708          * silent payloads are processed before handling the actual data
1709          */
1710         if (!processed)
1711                 return;
1712
1713         spin_lock_irqsave(&subs->lock, flags);
1714         if (!subs->last_delay)
1715                 goto out; /* short path */
1716
1717         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1718         /* update delay with exact number of samples played */
1719         if (processed > subs->last_delay)
1720                 subs->last_delay = 0;
1721         else
1722                 subs->last_delay -= processed;
1723         runtime->delay = subs->last_delay;
1724
1725         /*
1726          * Report when delay estimate is off by more than 2ms.
1727          * The error should be lower than 2ms since the estimate relies
1728          * on two reads of a counter updated every ms.
1729          */
1730         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1731                 dev_dbg_ratelimited(&subs->dev->dev,
1732                         "delay: estimated %d, actual %d\n",
1733                         est_delay, subs->last_delay);
1734
1735         if (!subs->running) {
1736                 /* update last_frame_number for delay counting here since
1737                  * prepare_playback_urb won't be called during pause
1738                  */
1739                 subs->last_frame_number =
1740                         usb_get_current_frame_number(subs->dev) & 0xff;
1741         }
1742
1743  out:
1744         spin_unlock_irqrestore(&subs->lock, flags);
1745 }
1746
1747 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1748                                               int cmd)
1749 {
1750         struct snd_usb_substream *subs = substream->runtime->private_data;
1751
1752         switch (cmd) {
1753         case SNDRV_PCM_TRIGGER_START:
1754                 subs->trigger_tstamp_pending_update = true;
1755                 fallthrough;
1756         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1757                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1758                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1759                 subs->running = 1;
1760                 return 0;
1761         case SNDRV_PCM_TRIGGER_STOP:
1762                 stop_endpoints(subs);
1763                 subs->running = 0;
1764                 return 0;
1765         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1766                 subs->data_endpoint->prepare_data_urb = NULL;
1767                 /* keep retire_data_urb for delay calculation */
1768                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1769                 subs->running = 0;
1770                 return 0;
1771         case SNDRV_PCM_TRIGGER_SUSPEND:
1772                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1773                         stop_endpoints(subs);
1774                         subs->need_setup_fmt = true;
1775                         return 0;
1776                 }
1777                 break;
1778         }
1779
1780         return -EINVAL;
1781 }
1782
1783 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1784                                              int cmd)
1785 {
1786         int err;
1787         struct snd_usb_substream *subs = substream->runtime->private_data;
1788
1789         switch (cmd) {
1790         case SNDRV_PCM_TRIGGER_START:
1791                 err = start_endpoints(subs);
1792                 if (err < 0)
1793                         return err;
1794
1795                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1796                 subs->running = 1;
1797                 return 0;
1798         case SNDRV_PCM_TRIGGER_STOP:
1799                 stop_endpoints(subs);
1800                 subs->data_endpoint->retire_data_urb = NULL;
1801                 subs->running = 0;
1802                 return 0;
1803         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1804                 subs->data_endpoint->retire_data_urb = NULL;
1805                 subs->running = 0;
1806                 return 0;
1807         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1808                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1809                 subs->running = 1;
1810                 return 0;
1811         case SNDRV_PCM_TRIGGER_SUSPEND:
1812                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1813                         stop_endpoints(subs);
1814                         subs->need_setup_fmt = true;
1815                         return 0;
1816                 }
1817                 break;
1818         }
1819
1820         return -EINVAL;
1821 }
1822
1823 static const struct snd_pcm_ops snd_usb_playback_ops = {
1824         .open =         snd_usb_pcm_open,
1825         .close =        snd_usb_pcm_close,
1826         .hw_params =    snd_usb_hw_params,
1827         .hw_free =      snd_usb_hw_free,
1828         .prepare =      snd_usb_pcm_prepare,
1829         .trigger =      snd_usb_substream_playback_trigger,
1830         .sync_stop =    snd_usb_pcm_sync_stop,
1831         .pointer =      snd_usb_pcm_pointer,
1832 };
1833
1834 static const struct snd_pcm_ops snd_usb_capture_ops = {
1835         .open =         snd_usb_pcm_open,
1836         .close =        snd_usb_pcm_close,
1837         .hw_params =    snd_usb_hw_params,
1838         .hw_free =      snd_usb_hw_free,
1839         .prepare =      snd_usb_pcm_prepare,
1840         .trigger =      snd_usb_substream_capture_trigger,
1841         .sync_stop =    snd_usb_pcm_sync_stop,
1842         .pointer =      snd_usb_pcm_pointer,
1843 };
1844
1845 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1846 {
1847         const struct snd_pcm_ops *ops;
1848
1849         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1850                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1851         snd_pcm_set_ops(pcm, stream, ops);
1852 }
1853
1854 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1855 {
1856         struct snd_pcm *pcm = subs->stream->pcm;
1857         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1858         struct device *dev = subs->dev->bus->controller;
1859
1860         if (snd_usb_use_vmalloc)
1861                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1862                                            NULL, 0, 0);
1863         else
1864                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1865                                            dev, 64*1024, 512*1024);
1866 }