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         case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
 349                 ep = 0x86;
 350                 ifnum = 2;
 351                 goto add_sync_ep_from_ifnum;
 352         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 353                 ep = 0x81;
 354                 ifnum = 2;
 355                 goto add_sync_ep_from_ifnum;
 356         case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
 357                 ep = 0x82;
 358                 ifnum = 2;
 359                 goto add_sync_ep_from_ifnum;
 360         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 361         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 362                 ep = 0x81;
 363                 ifnum = 1;
 364                 goto add_sync_ep_from_ifnum;
 365         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
 366                 /* MicroBook IIc */
 367                 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
 368                         return 0;
 369
 370                 /* MicroBook II */
 371                 ep = 0x84;
 372                 ifnum = 0;
 373                 goto add_sync_ep_from_ifnum;
 374         case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
 375         case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
 376         case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
 377         case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
 378         case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
 379                 ep = 0x81;
 380                 ifnum = 2;
 381                 goto add_sync_ep_from_ifnum;
 382         case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 383         case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
 384                 ep = 0x82;
 385                 ifnum = 0;
 386                 goto add_sync_ep_from_ifnum;
 387         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 388                 /* BOSS Katana amplifiers do not need quirks */
 389                 return 0;
 390         }
 391
 392         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 393             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 394             altsd->bInterfaceProtocol == 2 &&
 395             altsd->bNumEndpoints == 1 &&
 396             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 397             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 398                                       altsd->bAlternateSetting,
 399                                       &alts, &ep) >= 0) {
 400                 goto add_sync_ep;
 401         }
 402
 403         /* No quirk */
 404         return 0;
 405
 406 add_sync_ep_from_ifnum:
 407         iface = usb_ifnum_to_if(dev, ifnum);
 408
 409         if (!iface || iface->num_altsetting < 2)
 410                 return -EINVAL;
 411
 412         alts = &iface->altsetting[1];
 413
 414 add_sync_ep:
 415         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 416                                                    alts, ep, !subs->direction,
 417                                                    SND_USB_ENDPOINT_TYPE_DATA);
 418         if (!subs->sync_endpoint)
 419                 return -EINVAL;
 420
 421         subs->sync_endpoint->is_implicit_feedback = 1;
 422
 423         subs->data_endpoint->sync_master = subs->sync_endpoint;
 424
 425         return 1;
 426 }
 427
 428 static int set_sync_endpoint(struct snd_usb_substream *subs,
 429                              struct audioformat *fmt,
 430                              struct usb_device *dev,
 431                              struct usb_host_interface *alts,
 432                              struct usb_interface_descriptor *altsd)
 433 {
 434         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 435         unsigned int ep, attr;
 436         bool implicit_fb;
 437         int err;
 438
 439         /* we need a sync pipe in async OUT or adaptive IN mode */
 440         /* check the number of EP, since some devices have broken
 441          * descriptors which fool us.  if it has only one EP,
 442          * assume it as adaptive-out or sync-in.
 443          */
 444         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 445
 446         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 447                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 448
 449                 /*
 450                  * In these modes the notion of sync_endpoint is irrelevant.
 451                  * Reset pointers to avoid using stale data from previously
 452                  * used settings, e.g. when configuration and endpoints were
 453                  * changed
 454                  */
 455
 456                 subs->sync_endpoint = NULL;
 457                 subs->data_endpoint->sync_master = NULL;
 458         }
 459
 460         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 461         if (err < 0)
 462                 return err;
 463
 464         /* endpoint set by quirk */
 465         if (err > 0)
 466                 return 0;
 467
 468         if (altsd->bNumEndpoints < 2)
 469                 return 0;
 470
 471         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 472                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 473             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 474                 return 0;
 475
 476         /*
 477          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 478          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 479          * error fall back to SYNC mode and don't create sync endpoint
 480          */
 481
 482         /* check sync-pipe endpoint */
 483         /* ... and check descriptor size before accessing bSynchAddress
 484            because there is a version of the SB Audigy 2 NX firmware lacking
 485            the audio fields in the endpoint descriptors */
 486         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 487             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 488              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 489                 dev_err(&dev->dev,
 490                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 491                            fmt->iface, fmt->altsetting,
 492                            get_endpoint(alts, 1)->bmAttributes,
 493                            get_endpoint(alts, 1)->bLength,
 494                            get_endpoint(alts, 1)->bSynchAddress);
 495                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 496                         return 0;
 497                 return -EINVAL;
 498         }
 499         ep = get_endpoint(alts, 1)->bEndpointAddress;
 500         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 501             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 502             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 503              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 504                 dev_err(&dev->dev,
 505                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 506                            fmt->iface, fmt->altsetting,
 507                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 508                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 509                         return 0;
 510                 return -EINVAL;
 511         }
 512
 513         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 514                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 515
 516         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 517                                                    alts, ep, !subs->direction,
 518                                                    implicit_fb ?
 519                                                         SND_USB_ENDPOINT_TYPE_DATA :
 520                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 521
 522         if (!subs->sync_endpoint) {
 523                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 524                         return 0;
 525                 return -EINVAL;
 526         }
 527
 528         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 529
 530         subs->data_endpoint->sync_master = subs->sync_endpoint;
 531
 532         return 0;
 533 }
 534
 535 /*
 536  * find a matching format and set up the interface
 537  */
 538 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 539 {
 540         struct usb_device *dev = subs->dev;
 541         struct usb_host_interface *alts;
 542         struct usb_interface_descriptor *altsd;
 543         struct usb_interface *iface;
 544         int err;
 545
 546         iface = usb_ifnum_to_if(dev, fmt->iface);
 547         if (WARN_ON(!iface))
 548                 return -EINVAL;
 549         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 550         if (WARN_ON(!alts))
 551                 return -EINVAL;
 552         altsd = get_iface_desc(alts);
 553
 554         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 555                 return 0;
 556
 557         /* close the old interface */
 558         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 559                 if (!subs->stream->chip->keep_iface) {
 560                         err = usb_set_interface(subs->dev, subs->interface, 0);
 561                         if (err < 0) {
 562                                 dev_err(&dev->dev,
 563                                         "%d:%d: return to setting 0 failed (%d)\n",
 564                                         fmt->iface, fmt->altsetting, err);
 565                                 return -EIO;
 566                         }
 567                 }
 568                 subs->interface = -1;
 569                 subs->altset_idx = 0;
 570         }
 571
 572         if (subs->need_setup_fmt)
 573                 subs->need_setup_fmt = false;
 574
 575         /* set interface */
 576         if (iface->cur_altsetting != alts) {
 577                 err = snd_usb_select_mode_quirk(subs, fmt);
 578                 if (err < 0)
 579                         return -EIO;
 580
 581                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 582                 if (err < 0) {
 583                         dev_err(&dev->dev,
 584                                 "%d:%d: usb_set_interface failed (%d)\n",
 585                                 fmt->iface, fmt->altsetting, err);
 586                         return -EIO;
 587                 }
 588                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 589                         fmt->iface, fmt->altsetting);
 590                 snd_usb_set_interface_quirk(dev);
 591         }
 592
 593         subs->interface = fmt->iface;
 594         subs->altset_idx = fmt->altset_idx;
 595         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 596                                                    alts, fmt->endpoint, subs->direction,
 597                                                    SND_USB_ENDPOINT_TYPE_DATA);
 598
 599         if (!subs->data_endpoint)
 600                 return -EINVAL;
 601
 602         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 603         if (err < 0)
 604                 return err;
 605
 606         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 607         if (err < 0)
 608                 return err;
 609
 610         subs->cur_audiofmt = fmt;
 611
 612         snd_usb_set_format_quirk(subs, fmt);
 613
 614         return 0;
 615 }
 616
 617 /*
 618  * Return the score of matching two audioformats.
 619  * Veto the audioformat if:
 620  * - It has no channels for some reason.
 621  * - Requested PCM format is not supported.
 622  * - Requested sample rate is not supported.
 623  */
 624 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 625                                        struct audioformat *fp,
 626                                        struct audioformat *match, int rate,
 627                                        snd_pcm_format_t pcm_format)
 628 {
 629         int i;
 630         int score = 0;
 631
 632         if (fp->channels < 1) {
 633                 dev_dbg(&subs->dev->dev,
 634                         "%s: (fmt @%p) no channels\n", __func__, fp);
 635                 return 0;
 636         }
 637
 638         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 639                 dev_dbg(&subs->dev->dev,
 640                         "%s: (fmt @%p) no match for format %d\n", __func__,
 641                         fp, pcm_format);
 642                 return 0;
 643         }
 644
 645         for (i = 0; i < fp->nr_rates; i++) {
 646                 if (fp->rate_table[i] == rate) {
 647                         score++;
 648                         break;
 649                 }
 650         }
 651         if (!score) {
 652                 dev_dbg(&subs->dev->dev,
 653                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 654                         fp, rate);
 655                 return 0;
 656         }
 657
 658         if (fp->channels == match->channels)
 659                 score++;
 660
 661         dev_dbg(&subs->dev->dev,
 662                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 663
 664         return score;
 665 }
 666
 667 /*
 668  * Configure the sync ep using the rate and pcm format of the data ep.
 669  */
 670 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 671 {
 672         int ret;
 673         struct audioformat *fp;
 674         struct audioformat *sync_fp = NULL;
 675         int cur_score = 0;
 676         int sync_period_bytes = subs->period_bytes;
 677         struct snd_usb_substream *sync_subs =
 678                 &subs->stream->substream[subs->direction ^ 1];
 679
 680         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 681             !subs->stream)
 682                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 683                                                    subs->pcm_format,
 684                                                    subs->channels,
 685                                                    subs->period_bytes,
 686                                                    0, 0,
 687                                                    subs->cur_rate,
 688                                                    subs->cur_audiofmt,
 689                                                    NULL);
 690
 691         /* Try to find the best matching audioformat. */
 692         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 693                 int score = match_endpoint_audioformats(subs,
 694                                                         fp, subs->cur_audiofmt,
 695                         subs->cur_rate, subs->pcm_format);
 696
 697                 if (score > cur_score) {
 698                         sync_fp = fp;
 699                         cur_score = score;
 700                 }
 701         }
 702
 703         if (unlikely(sync_fp == NULL)) {
 704                 dev_err(&subs->dev->dev,
 705                         "%s: no valid audioformat for sync ep %x found\n",
 706                         __func__, sync_subs->ep_num);
 707                 return -EINVAL;
 708         }
 709
 710         /*
 711          * Recalculate the period bytes if channel number differ between
 712          * data and sync ep audioformat.
 713          */
 714         if (sync_fp->channels != subs->channels) {
 715                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 716                         sync_fp->channels;
 717                 dev_dbg(&subs->dev->dev,
 718                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 719                         __func__, subs->period_bytes, sync_period_bytes);
 720         }
 721
 722         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 723                                           subs->pcm_format,
 724                                           sync_fp->channels,
 725                                           sync_period_bytes,
 726                                           0, 0,
 727                                           subs->cur_rate,
 728                                           sync_fp,
 729                                           NULL);
 730
 731         return ret;
 732 }
 733
 734 /*
 735  * configure endpoint params
 736  *
 737  * called  during initial setup and upon resume
 738  */
 739 static int configure_endpoint(struct snd_usb_substream *subs)
 740 {
 741         int ret;
 742
 743         /* format changed */
 744         stop_endpoints(subs);
 745         sync_pending_stops(subs);
 746         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 747                                           subs->pcm_format,
 748                                           subs->channels,
 749                                           subs->period_bytes,
 750                                           subs->period_frames,
 751                                           subs->buffer_periods,
 752                                           subs->cur_rate,
 753                                           subs->cur_audiofmt,
 754                                           subs->sync_endpoint);
 755         if (ret < 0)
 756                 return ret;
 757
 758         if (subs->sync_endpoint)
 759                 ret = configure_sync_endpoint(subs);
 760
 761         return ret;
 762 }
 763
 764 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 765 {
 766         int ret;
 767
 768         if (!subs->str_pd)
 769                 return 0;
 770
 771         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 772         if (ret < 0) {
 773                 dev_err(&subs->dev->dev,
 774                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 775                         subs->str_pd->pd_id, state, ret);
 776                 return ret;
 777         }
 778
 779         return 0;
 780 }
 781
 782 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 783 {
 784         int ret;
 785
 786         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 787         if (ret < 0)
 788                 return ret;
 789
 790         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 791         if (ret < 0)
 792                 return ret;
 793
 794         return 0;
 795 }
 796
 797 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 798 {
 799         int ret;
 800
 801         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 802         if (ret < 0)
 803                 return ret;
 804
 805         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 806         if (ret < 0)
 807                 return ret;
 808
 809         return 0;
 810 }
 811
 812 /*
 813  * hw_params callback
 814  *
 815  * allocate a buffer and set the given audio format.
 816  *
 817  * so far we use a physically linear buffer although packetize transfer
 818  * doesn't need a continuous area.
 819  * if sg buffer is supported on the later version of alsa, we'll follow
 820  * that.
 821  */
 822 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 823                              struct snd_pcm_hw_params *hw_params)
 824 {
 825         struct snd_usb_substream *subs = substream->runtime->private_data;
 826         struct audioformat *fmt;
 827         int ret;
 828
 829         ret = snd_media_start_pipeline(subs);
 830         if (ret)
 831                 return ret;
 832
 833         subs->pcm_format = params_format(hw_params);
 834         subs->period_bytes = params_period_bytes(hw_params);
 835         subs->period_frames = params_period_size(hw_params);
 836         subs->buffer_periods = params_periods(hw_params);
 837         subs->channels = params_channels(hw_params);
 838         subs->cur_rate = params_rate(hw_params);
 839
 840         fmt = find_format(subs);
 841         if (!fmt) {
 842                 dev_dbg(&subs->dev->dev,
 843                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 844                            subs->pcm_format, subs->cur_rate, subs->channels);
 845                 ret = -EINVAL;
 846                 goto stop_pipeline;
 847         }
 848
 849         ret = snd_usb_lock_shutdown(subs->stream->chip);
 850         if (ret < 0)
 851                 goto stop_pipeline;
 852
 853         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 854         if (ret < 0)
 855                 goto unlock;
 856
 857         ret = set_format(subs, fmt);
 858         if (ret < 0)
 859                 goto unlock;
 860
 861         subs->interface = fmt->iface;
 862         subs->altset_idx = fmt->altset_idx;
 863         subs->need_setup_ep = true;
 864
 865  unlock:
 866         snd_usb_unlock_shutdown(subs->stream->chip);
 867         if (ret < 0)
 868                 goto stop_pipeline;
 869         return ret;
 870
 871  stop_pipeline:
 872         snd_media_stop_pipeline(subs);
 873         return ret;
 874 }
 875
 876 /*
 877  * hw_free callback
 878  *
 879  * reset the audio format and release the buffer
 880  */
 881 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 882 {
 883         struct snd_usb_substream *subs = substream->runtime->private_data;
 884
 885         snd_media_stop_pipeline(subs);
 886         subs->cur_audiofmt = NULL;
 887         subs->cur_rate = 0;
 888         subs->period_bytes = 0;
 889         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 890                 stop_endpoints(subs);
 891                 sync_pending_stops(subs);
 892                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 893                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 894                 snd_usb_unlock_shutdown(subs->stream->chip);
 895         }
 896
 897         return 0;
 898 }
 899
 900 /*
 901  * prepare callback
 902  *
 903  * only a few subtle things...
 904  */
 905 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 906 {
 907         struct snd_pcm_runtime *runtime = substream->runtime;
 908         struct snd_usb_substream *subs = runtime->private_data;
 909         struct usb_host_interface *alts;
 910         struct usb_interface *iface;
 911         int ret;
 912
 913         if (! subs->cur_audiofmt) {
 914                 dev_err(&subs->dev->dev, "no format is specified!\n");
 915                 return -ENXIO;
 916         }
 917
 918         ret = snd_usb_lock_shutdown(subs->stream->chip);
 919         if (ret < 0)
 920                 return ret;
 921         if (snd_BUG_ON(!subs->data_endpoint)) {
 922                 ret = -EIO;
 923                 goto unlock;
 924         }
 925
 926         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 927         if (ret < 0)
 928                 goto unlock;
 929
 930         ret = set_format(subs, subs->cur_audiofmt);
 931         if (ret < 0)
 932                 goto unlock;
 933
 934         if (subs->need_setup_ep) {
 935
 936                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 937                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 938                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 939                                                subs->cur_audiofmt->iface,
 940                                                alts,
 941                                                subs->cur_audiofmt,
 942                                                subs->cur_rate);
 943                 if (ret < 0)
 944                         goto unlock;
 945
 946                 ret = configure_endpoint(subs);
 947                 if (ret < 0)
 948                         goto unlock;
 949                 subs->need_setup_ep = false;
 950         }
 951
 952         /* some unit conversions in runtime */
 953         subs->data_endpoint->maxframesize =
 954                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 955         subs->data_endpoint->curframesize =
 956                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 957
 958         /* reset the pointer */
 959         subs->hwptr_done = 0;
 960         subs->transfer_done = 0;
 961         subs->last_delay = 0;
 962         subs->last_frame_number = 0;
 963         runtime->delay = 0;
 964
 965         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 966          * updates for all URBs would happen at the same time when starting */
 967         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 968                 ret = start_endpoints(subs);
 969
 970  unlock:
 971         snd_usb_unlock_shutdown(subs->stream->chip);
 972         return ret;
 973 }
 974
 975 static const struct snd_pcm_hardware snd_usb_hardware =
 976 {
 977         .info =                 SNDRV_PCM_INFO_MMAP |
 978                                 SNDRV_PCM_INFO_MMAP_VALID |
 979                                 SNDRV_PCM_INFO_BATCH |
 980                                 SNDRV_PCM_INFO_INTERLEAVED |
 981                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 982                                 SNDRV_PCM_INFO_PAUSE,
 983         .buffer_bytes_max =     1024 * 1024,
 984         .period_bytes_min =     64,
 985         .period_bytes_max =     512 * 1024,
 986         .periods_min =          2,
 987         .periods_max =          1024,
 988 };
 989
 990 static int hw_check_valid_format(struct snd_usb_substream *subs,
 991                                  struct snd_pcm_hw_params *params,
 992                                  struct audioformat *fp)
 993 {
 994         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 995         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 996         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 997         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 998         struct snd_mask check_fmts;
 999         unsigned int ptime;
1000
1001         /* check the format */
1002         snd_mask_none(&check_fmts);
1003         check_fmts.bits[0] = (u32)fp->formats;
1004         check_fmts.bits[1] = (u32)(fp->formats >> 32);
1005         snd_mask_intersect(&check_fmts, fmts);
1006         if (snd_mask_empty(&check_fmts)) {
1007                 hwc_debug("   > check: no supported format %d\n", fp->format);
1008                 return 0;
1009         }
1010         /* check the channels */
1011         if (fp->channels < ct->min || fp->channels > ct->max) {
1012                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1013                 return 0;
1014         }
1015         /* check the rate is within the range */
1016         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1017                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1018                 return 0;
1019         }
1020         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1021                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1022                 return 0;
1023         }
1024         /* check whether the period time is >= the data packet interval */
1025         if (subs->speed != USB_SPEED_FULL) {
1026                 ptime = 125 * (1 << fp->datainterval);
1027                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1028                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1029                         return 0;
1030                 }
1031         }
1032         return 1;
1033 }
1034
1035 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1036                         struct snd_pcm_hw_rule *rule)
1037 {
1038         struct snd_usb_substream *subs = rule->private;
1039         struct audioformat *fp;
1040         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1041         unsigned int rmin, rmax;
1042         int changed;
1043
1044         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1045         changed = 0;
1046         rmin = rmax = 0;
1047         list_for_each_entry(fp, &subs->fmt_list, list) {
1048                 if (!hw_check_valid_format(subs, params, fp))
1049                         continue;
1050                 if (changed++) {
1051                         if (rmin > fp->rate_min)
1052                                 rmin = fp->rate_min;
1053                         if (rmax < fp->rate_max)
1054                                 rmax = fp->rate_max;
1055                 } else {
1056                         rmin = fp->rate_min;
1057                         rmax = fp->rate_max;
1058                 }
1059         }
1060
1061         if (!changed) {
1062                 hwc_debug("  --> get empty\n");
1063                 it->empty = 1;
1064                 return -EINVAL;
1065         }
1066
1067         changed = 0;
1068         if (it->min < rmin) {
1069                 it->min = rmin;
1070                 it->openmin = 0;
1071                 changed = 1;
1072         }
1073         if (it->max > rmax) {
1074                 it->max = rmax;
1075                 it->openmax = 0;
1076                 changed = 1;
1077         }
1078         if (snd_interval_checkempty(it)) {
1079                 it->empty = 1;
1080                 return -EINVAL;
1081         }
1082         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1083         return changed;
1084 }
1085
1086
1087 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1088                             struct snd_pcm_hw_rule *rule)
1089 {
1090         struct snd_usb_substream *subs = rule->private;
1091         struct audioformat *fp;
1092         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1093         unsigned int rmin, rmax;
1094         int changed;
1095
1096         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1097         changed = 0;
1098         rmin = rmax = 0;
1099         list_for_each_entry(fp, &subs->fmt_list, list) {
1100                 if (!hw_check_valid_format(subs, params, fp))
1101                         continue;
1102                 if (changed++) {
1103                         if (rmin > fp->channels)
1104                                 rmin = fp->channels;
1105                         if (rmax < fp->channels)
1106                                 rmax = fp->channels;
1107                 } else {
1108                         rmin = fp->channels;
1109                         rmax = fp->channels;
1110                 }
1111         }
1112
1113         if (!changed) {
1114                 hwc_debug("  --> get empty\n");
1115                 it->empty = 1;
1116                 return -EINVAL;
1117         }
1118
1119         changed = 0;
1120         if (it->min < rmin) {
1121                 it->min = rmin;
1122                 it->openmin = 0;
1123                 changed = 1;
1124         }
1125         if (it->max > rmax) {
1126                 it->max = rmax;
1127                 it->openmax = 0;
1128                 changed = 1;
1129         }
1130         if (snd_interval_checkempty(it)) {
1131                 it->empty = 1;
1132                 return -EINVAL;
1133         }
1134         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1135         return changed;
1136 }
1137
1138 static int hw_rule_format(struct snd_pcm_hw_params *params,
1139                           struct snd_pcm_hw_rule *rule)
1140 {
1141         struct snd_usb_substream *subs = rule->private;
1142         struct audioformat *fp;
1143         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1144         u64 fbits;
1145         u32 oldbits[2];
1146         int changed;
1147
1148         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1149         fbits = 0;
1150         list_for_each_entry(fp, &subs->fmt_list, list) {
1151                 if (!hw_check_valid_format(subs, params, fp))
1152                         continue;
1153                 fbits |= fp->formats;
1154         }
1155
1156         oldbits[0] = fmt->bits[0];
1157         oldbits[1] = fmt->bits[1];
1158         fmt->bits[0] &= (u32)fbits;
1159         fmt->bits[1] &= (u32)(fbits >> 32);
1160         if (!fmt->bits[0] && !fmt->bits[1]) {
1161                 hwc_debug("  --> get empty\n");
1162                 return -EINVAL;
1163         }
1164         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1165         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1166         return changed;
1167 }
1168
1169 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1170                                struct snd_pcm_hw_rule *rule)
1171 {
1172         struct snd_usb_substream *subs = rule->private;
1173         struct audioformat *fp;
1174         struct snd_interval *it;
1175         unsigned char min_datainterval;
1176         unsigned int pmin;
1177         int changed;
1178
1179         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1180         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1181         min_datainterval = 0xff;
1182         list_for_each_entry(fp, &subs->fmt_list, list) {
1183                 if (!hw_check_valid_format(subs, params, fp))
1184                         continue;
1185                 min_datainterval = min(min_datainterval, fp->datainterval);
1186         }
1187         if (min_datainterval == 0xff) {
1188                 hwc_debug("  --> get empty\n");
1189                 it->empty = 1;
1190                 return -EINVAL;
1191         }
1192         pmin = 125 * (1 << min_datainterval);
1193         changed = 0;
1194         if (it->min < pmin) {
1195                 it->min = pmin;
1196                 it->openmin = 0;
1197                 changed = 1;
1198         }
1199         if (snd_interval_checkempty(it)) {
1200                 it->empty = 1;
1201                 return -EINVAL;
1202         }
1203         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1204         return changed;
1205 }
1206
1207 /*
1208  *  If the device supports unusual bit rates, does the request meet these?
1209  */
1210 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1211                                   struct snd_usb_substream *subs)
1212 {
1213         struct audioformat *fp;
1214         int *rate_list;
1215         int count = 0, needs_knot = 0;
1216         int err;
1217
1218         kfree(subs->rate_list.list);
1219         subs->rate_list.list = NULL;
1220
1221         list_for_each_entry(fp, &subs->fmt_list, list) {
1222                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1223                         return 0;
1224                 count += fp->nr_rates;
1225                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1226                         needs_knot = 1;
1227         }
1228         if (!needs_knot)
1229                 return 0;
1230
1231         subs->rate_list.list = rate_list =
1232                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1233         if (!subs->rate_list.list)
1234                 return -ENOMEM;
1235         subs->rate_list.count = count;
1236         subs->rate_list.mask = 0;
1237         count = 0;
1238         list_for_each_entry(fp, &subs->fmt_list, list) {
1239                 int i;
1240                 for (i = 0; i < fp->nr_rates; i++)
1241                         rate_list[count++] = fp->rate_table[i];
1242         }
1243         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1244                                          &subs->rate_list);
1245         if (err < 0)
1246                 return err;
1247
1248         return 0;
1249 }
1250
1251
1252 /*
1253  * set up the runtime hardware information.
1254  */
1255
1256 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1257 {
1258         struct audioformat *fp;
1259         unsigned int pt, ptmin;
1260         int param_period_time_if_needed;
1261         int err;
1262
1263         runtime->hw.formats = subs->formats;
1264
1265         runtime->hw.rate_min = 0x7fffffff;
1266         runtime->hw.rate_max = 0;
1267         runtime->hw.channels_min = 256;
1268         runtime->hw.channels_max = 0;
1269         runtime->hw.rates = 0;
1270         ptmin = UINT_MAX;
1271         /* check min/max rates and channels */
1272         list_for_each_entry(fp, &subs->fmt_list, list) {
1273                 runtime->hw.rates |= fp->rates;
1274                 if (runtime->hw.rate_min > fp->rate_min)
1275                         runtime->hw.rate_min = fp->rate_min;
1276                 if (runtime->hw.rate_max < fp->rate_max)
1277                         runtime->hw.rate_max = fp->rate_max;
1278                 if (runtime->hw.channels_min > fp->channels)
1279                         runtime->hw.channels_min = fp->channels;
1280                 if (runtime->hw.channels_max < fp->channels)
1281                         runtime->hw.channels_max = fp->channels;
1282                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1283                         /* FIXME: there might be more than one audio formats... */
1284                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1285                                 fp->frame_size;
1286                 }
1287                 pt = 125 * (1 << fp->datainterval);
1288                 ptmin = min(ptmin, pt);
1289         }
1290
1291         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1292         if (subs->speed == USB_SPEED_FULL)
1293                 /* full speed devices have fixed data packet interval */
1294                 ptmin = 1000;
1295         if (ptmin == 1000)
1296                 /* if period time doesn't go below 1 ms, no rules needed */
1297                 param_period_time_if_needed = -1;
1298
1299         err = snd_pcm_hw_constraint_minmax(runtime,
1300                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1301                                            ptmin, UINT_MAX);
1302         if (err < 0)
1303                 return err;
1304
1305         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1306                                   hw_rule_rate, subs,
1307                                   SNDRV_PCM_HW_PARAM_FORMAT,
1308                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1309                                   param_period_time_if_needed,
1310                                   -1);
1311         if (err < 0)
1312                 return err;
1313         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1314                                   hw_rule_channels, subs,
1315                                   SNDRV_PCM_HW_PARAM_FORMAT,
1316                                   SNDRV_PCM_HW_PARAM_RATE,
1317                                   param_period_time_if_needed,
1318                                   -1);
1319         if (err < 0)
1320                 return err;
1321         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1322                                   hw_rule_format, subs,
1323                                   SNDRV_PCM_HW_PARAM_RATE,
1324                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1325                                   param_period_time_if_needed,
1326                                   -1);
1327         if (err < 0)
1328                 return err;
1329         if (param_period_time_if_needed >= 0) {
1330                 err = snd_pcm_hw_rule_add(runtime, 0,
1331                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1332                                           hw_rule_period_time, subs,
1333                                           SNDRV_PCM_HW_PARAM_FORMAT,
1334                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1335                                           SNDRV_PCM_HW_PARAM_RATE,
1336                                           -1);
1337                 if (err < 0)
1338                         return err;
1339         }
1340         err = snd_usb_pcm_check_knot(runtime, subs);
1341         if (err < 0)
1342                 return err;
1343
1344         return snd_usb_autoresume(subs->stream->chip);
1345 }
1346
1347 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1348 {
1349         int direction = substream->stream;
1350         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1351         struct snd_pcm_runtime *runtime = substream->runtime;
1352         struct snd_usb_substream *subs = &as->substream[direction];
1353         int ret;
1354
1355         subs->interface = -1;
1356         subs->altset_idx = 0;
1357         runtime->hw = snd_usb_hardware;
1358         runtime->private_data = subs;
1359         subs->pcm_substream = substream;
1360         /* runtime PM is also done there */
1361
1362         /* initialize DSD/DOP context */
1363         subs->dsd_dop.byte_idx = 0;
1364         subs->dsd_dop.channel = 0;
1365         subs->dsd_dop.marker = 1;
1366
1367         ret = setup_hw_info(runtime, subs);
1368         if (ret == 0) {
1369                 ret = snd_media_stream_init(subs, as->pcm, direction);
1370                 if (ret)
1371                         snd_usb_autosuspend(subs->stream->chip);
1372         }
1373         return ret;
1374 }
1375
1376 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1377 {
1378         int direction = substream->stream;
1379         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1380         struct snd_usb_substream *subs = &as->substream[direction];
1381         int ret;
1382
1383         snd_media_stop_pipeline(subs);
1384
1385         if (!as->chip->keep_iface &&
1386             subs->interface >= 0 &&
1387             !snd_usb_lock_shutdown(subs->stream->chip)) {
1388                 usb_set_interface(subs->dev, subs->interface, 0);
1389                 subs->interface = -1;
1390                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1391                 snd_usb_unlock_shutdown(subs->stream->chip);
1392                 if (ret < 0)
1393                         return ret;
1394         }
1395
1396         subs->pcm_substream = NULL;
1397         snd_usb_autosuspend(subs->stream->chip);
1398
1399         return 0;
1400 }
1401
1402 /* Since a URB can handle only a single linear buffer, we must use double
1403  * buffering when the data to be transferred overflows the buffer boundary.
1404  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1405  * for all URBs.
1406  */
1407 static void retire_capture_urb(struct snd_usb_substream *subs,
1408                                struct urb *urb)
1409 {
1410         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1411         unsigned int stride, frames, bytes, oldptr;
1412         int i, period_elapsed = 0;
1413         unsigned long flags;
1414         unsigned char *cp;
1415         int current_frame_number;
1416
1417         /* read frame number here, update pointer in critical section */
1418         current_frame_number = usb_get_current_frame_number(subs->dev);
1419
1420         stride = runtime->frame_bits >> 3;
1421
1422         for (i = 0; i < urb->number_of_packets; i++) {
1423                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1424                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1425                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1426                                 i, urb->iso_frame_desc[i].status);
1427                         // continue;
1428                 }
1429                 bytes = urb->iso_frame_desc[i].actual_length;
1430                 if (subs->stream_offset_adj > 0) {
1431                         unsigned int adj = min(subs->stream_offset_adj, bytes);
1432                         cp += adj;
1433                         bytes -= adj;
1434                         subs->stream_offset_adj -= adj;
1435                 }
1436                 frames = bytes / stride;
1437                 if (!subs->txfr_quirk)
1438                         bytes = frames * stride;
1439                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1440                         int oldbytes = bytes;
1441                         bytes = frames * stride;
1442                         dev_warn_ratelimited(&subs->dev->dev,
1443                                  "Corrected urb data len. %d->%d\n",
1444                                                         oldbytes, bytes);
1445                 }
1446                 /* update the current pointer */
1447                 spin_lock_irqsave(&subs->lock, flags);
1448                 oldptr = subs->hwptr_done;
1449                 subs->hwptr_done += bytes;
1450                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1451                         subs->hwptr_done -= runtime->buffer_size * stride;
1452                 frames = (bytes + (oldptr % stride)) / stride;
1453                 subs->transfer_done += frames;
1454                 if (subs->transfer_done >= runtime->period_size) {
1455                         subs->transfer_done -= runtime->period_size;
1456                         period_elapsed = 1;
1457                 }
1458                 /* capture delay is by construction limited to one URB,
1459                  * reset delays here
1460                  */
1461                 runtime->delay = subs->last_delay = 0;
1462
1463                 /* realign last_frame_number */
1464                 subs->last_frame_number = current_frame_number;
1465                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1466
1467                 spin_unlock_irqrestore(&subs->lock, flags);
1468                 /* copy a data chunk */
1469                 if (oldptr + bytes > runtime->buffer_size * stride) {
1470                         unsigned int bytes1 =
1471                                         runtime->buffer_size * stride - oldptr;
1472                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1473                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1474                 } else {
1475                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1476                 }
1477         }
1478
1479         if (period_elapsed)
1480                 snd_pcm_period_elapsed(subs->pcm_substream);
1481 }
1482
1483 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1484                                              struct urb *urb, unsigned int bytes)
1485 {
1486         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1487         unsigned int stride = runtime->frame_bits >> 3;
1488         unsigned int dst_idx = 0;
1489         unsigned int src_idx = subs->hwptr_done;
1490         unsigned int wrap = runtime->buffer_size * stride;
1491         u8 *dst = urb->transfer_buffer;
1492         u8 *src = runtime->dma_area;
1493         u8 marker[] = { 0x05, 0xfa };
1494
1495         /*
1496          * The DSP DOP format defines a way to transport DSD samples over
1497          * normal PCM data endpoints. It requires stuffing of marker bytes
1498          * (0x05 and 0xfa, alternating per sample frame), and then expects
1499          * 2 additional bytes of actual payload. The whole frame is stored
1500          * LSB.
1501          *
1502          * Hence, for a stereo transport, the buffer layout looks like this,
1503          * where L refers to left channel samples and R to right.
1504          *
1505          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1506          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1507          *   .....
1508          *
1509          */
1510
1511         while (bytes--) {
1512                 if (++subs->dsd_dop.byte_idx == 3) {
1513                         /* frame boundary? */
1514                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1515                         src_idx += 2;
1516                         subs->dsd_dop.byte_idx = 0;
1517
1518                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1519                                 /* alternate the marker */
1520                                 subs->dsd_dop.marker++;
1521                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1522                                 subs->dsd_dop.channel = 0;
1523                         }
1524                 } else {
1525                         /* stuff the DSD payload */
1526                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1527
1528                         if (subs->cur_audiofmt->dsd_bitrev)
1529                                 dst[dst_idx++] = bitrev8(src[idx]);
1530                         else
1531                                 dst[dst_idx++] = src[idx];
1532
1533                         subs->hwptr_done++;
1534                 }
1535         }
1536         if (subs->hwptr_done >= runtime->buffer_size * stride)
1537                 subs->hwptr_done -= runtime->buffer_size * stride;
1538 }
1539
1540 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1541                         int offset, int stride, unsigned int bytes)
1542 {
1543         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1544
1545         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1546                 /* err, the transferred area goes over buffer boundary. */
1547                 unsigned int bytes1 =
1548                         runtime->buffer_size * stride - subs->hwptr_done;
1549                 memcpy(urb->transfer_buffer + offset,
1550                        runtime->dma_area + subs->hwptr_done, bytes1);
1551                 memcpy(urb->transfer_buffer + offset + bytes1,
1552                        runtime->dma_area, bytes - bytes1);
1553         } else {
1554                 memcpy(urb->transfer_buffer + offset,
1555                        runtime->dma_area + subs->hwptr_done, bytes);
1556         }
1557         subs->hwptr_done += bytes;
1558         if (subs->hwptr_done >= runtime->buffer_size * stride)
1559                 subs->hwptr_done -= runtime->buffer_size * stride;
1560 }
1561
1562 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1563                                       struct urb *urb, int stride,
1564                                       unsigned int bytes)
1565 {
1566         __le32 packet_length;
1567         int i;
1568
1569         /* Put __le32 length descriptor at start of each packet. */
1570         for (i = 0; i < urb->number_of_packets; i++) {
1571                 unsigned int length = urb->iso_frame_desc[i].length;
1572                 unsigned int offset = urb->iso_frame_desc[i].offset;
1573
1574                 packet_length = cpu_to_le32(length);
1575                 offset += i * sizeof(packet_length);
1576                 urb->iso_frame_desc[i].offset = offset;
1577                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1578                 memcpy(urb->transfer_buffer + offset,
1579                        &packet_length, sizeof(packet_length));
1580                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1581                             stride, length);
1582         }
1583         /* Adjust transfer size accordingly. */
1584         bytes += urb->number_of_packets * sizeof(packet_length);
1585         return bytes;
1586 }
1587
1588 static void prepare_playback_urb(struct snd_usb_substream *subs,
1589                                  struct urb *urb)
1590 {
1591         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1592         struct snd_usb_endpoint *ep = subs->data_endpoint;
1593         struct snd_urb_ctx *ctx = urb->context;
1594         unsigned int counts, frames, bytes;
1595         int i, stride, period_elapsed = 0;
1596         unsigned long flags;
1597
1598         stride = runtime->frame_bits >> 3;
1599
1600         frames = 0;
1601         urb->number_of_packets = 0;
1602         spin_lock_irqsave(&subs->lock, flags);
1603         subs->frame_limit += ep->max_urb_frames;
1604         for (i = 0; i < ctx->packets; i++) {
1605                 if (ctx->packet_size[i])
1606                         counts = ctx->packet_size[i];
1607                 else if (ep->sync_master)
1608                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1609                 else
1610                         counts = snd_usb_endpoint_next_packet_size(ep);
1611
1612                 /* set up descriptor */
1613                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1614                 urb->iso_frame_desc[i].length = counts * ep->stride;
1615                 frames += counts;
1616                 urb->number_of_packets++;
1617                 subs->transfer_done += counts;
1618                 if (subs->transfer_done >= runtime->period_size) {
1619                         subs->transfer_done -= runtime->period_size;
1620                         subs->frame_limit = 0;
1621                         period_elapsed = 1;
1622                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1623                                 if (subs->transfer_done > 0) {
1624                                         /* FIXME: fill-max mode is not
1625                                          * supported yet */
1626                                         frames -= subs->transfer_done;
1627                                         counts -= subs->transfer_done;
1628                                         urb->iso_frame_desc[i].length =
1629                                                 counts * ep->stride;
1630                                         subs->transfer_done = 0;
1631                                 }
1632                                 i++;
1633                                 if (i < ctx->packets) {
1634                                         /* add a transfer delimiter */
1635                                         urb->iso_frame_desc[i].offset =
1636                                                 frames * ep->stride;
1637                                         urb->iso_frame_desc[i].length = 0;
1638                                         urb->number_of_packets++;
1639                                 }
1640                                 break;
1641                         }
1642                 }
1643                 /* finish at the period boundary or after enough frames */
1644                 if ((period_elapsed ||
1645                                 subs->transfer_done >= subs->frame_limit) &&
1646                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1647                         break;
1648         }
1649         bytes = frames * ep->stride;
1650
1651         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1652                      subs->cur_audiofmt->dsd_dop)) {
1653                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1654         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1655                            subs->cur_audiofmt->dsd_bitrev)) {
1656                 /* bit-reverse the bytes */
1657                 u8 *buf = urb->transfer_buffer;
1658                 for (i = 0; i < bytes; i++) {
1659                         int idx = (subs->hwptr_done + i)
1660                                 % (runtime->buffer_size * stride);
1661                         buf[i] = bitrev8(runtime->dma_area[idx]);
1662                 }
1663
1664                 subs->hwptr_done += bytes;
1665                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1666                         subs->hwptr_done -= runtime->buffer_size * stride;
1667         } else {
1668                 /* usual PCM */
1669                 if (!subs->tx_length_quirk)
1670                         copy_to_urb(subs, urb, 0, stride, bytes);
1671                 else
1672                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1673                         /* bytes is now amount of outgoing data */
1674         }
1675
1676         /* update delay with exact number of samples queued */
1677         runtime->delay = subs->last_delay;
1678         runtime->delay += frames;
1679         subs->last_delay = runtime->delay;
1680
1681         /* realign last_frame_number */
1682         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1683         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1684
1685         if (subs->trigger_tstamp_pending_update) {
1686                 /* this is the first actual URB submitted,
1687                  * update trigger timestamp to reflect actual start time
1688                  */
1689                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1690                 subs->trigger_tstamp_pending_update = false;
1691         }
1692
1693         spin_unlock_irqrestore(&subs->lock, flags);
1694         urb->transfer_buffer_length = bytes;
1695         if (period_elapsed)
1696                 snd_pcm_period_elapsed(subs->pcm_substream);
1697 }
1698
1699 /*
1700  * process after playback data complete
1701  * - decrease the delay count again
1702  */
1703 static void retire_playback_urb(struct snd_usb_substream *subs,
1704                                struct urb *urb)
1705 {
1706         unsigned long flags;
1707         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1708         struct snd_usb_endpoint *ep = subs->data_endpoint;
1709         int processed = urb->transfer_buffer_length / ep->stride;
1710         int est_delay;
1711
1712         /* ignore the delay accounting when processed=0 is given, i.e.
1713          * silent payloads are processed before handling the actual data
1714          */
1715         if (!processed)
1716                 return;
1717
1718         spin_lock_irqsave(&subs->lock, flags);
1719         if (!subs->last_delay)
1720                 goto out; /* short path */
1721
1722         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1723         /* update delay with exact number of samples played */
1724         if (processed > subs->last_delay)
1725                 subs->last_delay = 0;
1726         else
1727                 subs->last_delay -= processed;
1728         runtime->delay = subs->last_delay;
1729
1730         /*
1731          * Report when delay estimate is off by more than 2ms.
1732          * The error should be lower than 2ms since the estimate relies
1733          * on two reads of a counter updated every ms.
1734          */
1735         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1736                 dev_dbg_ratelimited(&subs->dev->dev,
1737                         "delay: estimated %d, actual %d\n",
1738                         est_delay, subs->last_delay);
1739
1740         if (!subs->running) {
1741                 /* update last_frame_number for delay counting here since
1742                  * prepare_playback_urb won't be called during pause
1743                  */
1744                 subs->last_frame_number =
1745                         usb_get_current_frame_number(subs->dev) & 0xff;
1746         }
1747
1748  out:
1749         spin_unlock_irqrestore(&subs->lock, flags);
1750 }
1751
1752 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1753                                               int cmd)
1754 {
1755         struct snd_usb_substream *subs = substream->runtime->private_data;
1756
1757         switch (cmd) {
1758         case SNDRV_PCM_TRIGGER_START:
1759                 subs->trigger_tstamp_pending_update = true;
1760                 fallthrough;
1761         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1762                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1763                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1764                 subs->running = 1;
1765                 return 0;
1766         case SNDRV_PCM_TRIGGER_STOP:
1767                 stop_endpoints(subs);
1768                 subs->running = 0;
1769                 return 0;
1770         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1771                 subs->data_endpoint->prepare_data_urb = NULL;
1772                 /* keep retire_data_urb for delay calculation */
1773                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1774                 subs->running = 0;
1775                 return 0;
1776         case SNDRV_PCM_TRIGGER_SUSPEND:
1777                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1778                         stop_endpoints(subs);
1779                         subs->need_setup_fmt = true;
1780                         return 0;
1781                 }
1782                 break;
1783         }
1784
1785         return -EINVAL;
1786 }
1787
1788 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1789                                              int cmd)
1790 {
1791         int err;
1792         struct snd_usb_substream *subs = substream->runtime->private_data;
1793
1794         switch (cmd) {
1795         case SNDRV_PCM_TRIGGER_START:
1796                 err = start_endpoints(subs);
1797                 if (err < 0)
1798                         return err;
1799
1800                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1801                 subs->running = 1;
1802                 return 0;
1803         case SNDRV_PCM_TRIGGER_STOP:
1804                 stop_endpoints(subs);
1805                 subs->data_endpoint->retire_data_urb = NULL;
1806                 subs->running = 0;
1807                 return 0;
1808         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1809                 subs->data_endpoint->retire_data_urb = NULL;
1810                 subs->running = 0;
1811                 return 0;
1812         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1813                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1814                 subs->running = 1;
1815                 return 0;
1816         case SNDRV_PCM_TRIGGER_SUSPEND:
1817                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1818                         stop_endpoints(subs);
1819                         subs->need_setup_fmt = true;
1820                         return 0;
1821                 }
1822                 break;
1823         }
1824
1825         return -EINVAL;
1826 }
1827
1828 static const struct snd_pcm_ops snd_usb_playback_ops = {
1829         .open =         snd_usb_pcm_open,
1830         .close =        snd_usb_pcm_close,
1831         .hw_params =    snd_usb_hw_params,
1832         .hw_free =      snd_usb_hw_free,
1833         .prepare =      snd_usb_pcm_prepare,
1834         .trigger =      snd_usb_substream_playback_trigger,
1835         .sync_stop =    snd_usb_pcm_sync_stop,
1836         .pointer =      snd_usb_pcm_pointer,
1837 };
1838
1839 static const struct snd_pcm_ops snd_usb_capture_ops = {
1840         .open =         snd_usb_pcm_open,
1841         .close =        snd_usb_pcm_close,
1842         .hw_params =    snd_usb_hw_params,
1843         .hw_free =      snd_usb_hw_free,
1844         .prepare =      snd_usb_pcm_prepare,
1845         .trigger =      snd_usb_substream_capture_trigger,
1846         .sync_stop =    snd_usb_pcm_sync_stop,
1847         .pointer =      snd_usb_pcm_pointer,
1848 };
1849
1850 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1851 {
1852         const struct snd_pcm_ops *ops;
1853
1854         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1855                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1856         snd_pcm_set_ops(pcm, stream, ops);
1857 }
1858
1859 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1860 {
1861         struct snd_pcm *pcm = subs->stream->pcm;
1862         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1863         struct device *dev = subs->dev->bus->controller;
1864
1865         if (snd_usb_use_vmalloc)
1866                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1867                                            NULL, 0, 0);
1868         else
1869                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1870                                            dev, 64*1024, 512*1024);
1871 }