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         sync_pending_stops(subs);
 284         return 0;
 285 }
 286
 287 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 288                                      unsigned int altsetting,
 289                                      struct usb_host_interface **alts,
 290                                      unsigned int *ep)
 291 {
 292         struct usb_interface *iface;
 293         struct usb_interface_descriptor *altsd;
 294         struct usb_endpoint_descriptor *epd;
 295
 296         iface = usb_ifnum_to_if(dev, ifnum);
 297         if (!iface || iface->num_altsetting < altsetting + 1)
 298                 return -ENOENT;
 299         *alts = &iface->altsetting[altsetting];
 300         altsd = get_iface_desc(*alts);
 301         if (altsd->bAlternateSetting != altsetting ||
 302             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 303             (altsd->bInterfaceSubClass != 2 &&
 304              altsd->bInterfaceProtocol != 2   ) ||
 305             altsd->bNumEndpoints < 1)
 306                 return -ENOENT;
 307         epd = get_endpoint(*alts, 0);
 308         if (!usb_endpoint_is_isoc_in(epd) ||
 309             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 310                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 311                 return -ENOENT;
 312         *ep = epd->bEndpointAddress;
 313         return 0;
 314 }
 315
 316 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 317  * applies. Returns 1 if a quirk was found.
 318  */
 319 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 320                                          struct usb_device *dev,
 321                                          struct usb_interface_descriptor *altsd,
 322                                          unsigned int attr)
 323 {
 324         struct usb_host_interface *alts;
 325         struct usb_interface *iface;
 326         unsigned int ep;
 327         unsigned int ifnum;
 328
 329         /* Implicit feedback sync EPs consumers are always playback EPs */
 330         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 331                 return 0;
 332
 333         switch (subs->stream->chip->usb_id) {
 334         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 335         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 336         case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
 337                 ep = 0x81;
 338                 ifnum = 3;
 339                 goto add_sync_ep_from_ifnum;
 340         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 341         case USB_ID(0x0763, 0x2081):
 342                 ep = 0x81;
 343                 ifnum = 2;
 344                 goto add_sync_ep_from_ifnum;
 345         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 346         case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
 347                 ep = 0x86;
 348                 ifnum = 2;
 349                 goto add_sync_ep_from_ifnum;
 350         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 351                 ep = 0x81;
 352                 ifnum = 2;
 353                 goto add_sync_ep_from_ifnum;
 354         case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
 355                 ep = 0x82;
 356                 ifnum = 2;
 357                 goto add_sync_ep_from_ifnum;
 358         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 359         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 360                 ep = 0x81;
 361                 ifnum = 1;
 362                 goto add_sync_ep_from_ifnum;
 363         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
 364                 /* MicroBook IIc */
 365                 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
 366                         return 0;
 367
 368                 /* MicroBook II */
 369                 ep = 0x84;
 370                 ifnum = 0;
 371                 goto add_sync_ep_from_ifnum;
 372         case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
 373         case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
 374         case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
 375         case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
 376         case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
 377                 ep = 0x81;
 378                 ifnum = 2;
 379                 goto add_sync_ep_from_ifnum;
 380         case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 381         case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
 382                 ep = 0x82;
 383                 ifnum = 0;
 384                 goto add_sync_ep_from_ifnum;
 385         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 386                 /* BOSS Katana amplifiers do not need quirks */
 387                 return 0;
 388         }
 389
 390         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 391             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 392             altsd->bInterfaceProtocol == 2 &&
 393             altsd->bNumEndpoints == 1 &&
 394             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 395             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 396                                       altsd->bAlternateSetting,
 397                                       &alts, &ep) >= 0) {
 398                 goto add_sync_ep;
 399         }
 400
 401         /* No quirk */
 402         return 0;
 403
 404 add_sync_ep_from_ifnum:
 405         iface = usb_ifnum_to_if(dev, ifnum);
 406
 407         if (!iface || iface->num_altsetting < 2)
 408                 return -EINVAL;
 409
 410         alts = &iface->altsetting[1];
 411
 412 add_sync_ep:
 413         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 414                                                    alts, ep, !subs->direction,
 415                                                    SND_USB_ENDPOINT_TYPE_DATA);
 416         if (!subs->sync_endpoint)
 417                 return -EINVAL;
 418
 419         subs->sync_endpoint->is_implicit_feedback = 1;
 420
 421         subs->data_endpoint->sync_master = subs->sync_endpoint;
 422
 423         return 1;
 424 }
 425
 426 static int set_sync_endpoint(struct snd_usb_substream *subs,
 427                              struct audioformat *fmt,
 428                              struct usb_device *dev,
 429                              struct usb_host_interface *alts,
 430                              struct usb_interface_descriptor *altsd)
 431 {
 432         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 433         unsigned int ep, attr;
 434         bool implicit_fb;
 435         int err;
 436
 437         /* we need a sync pipe in async OUT or adaptive IN mode */
 438         /* check the number of EP, since some devices have broken
 439          * descriptors which fool us.  if it has only one EP,
 440          * assume it as adaptive-out or sync-in.
 441          */
 442         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 443
 444         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 445                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 446
 447                 /*
 448                  * In these modes the notion of sync_endpoint is irrelevant.
 449                  * Reset pointers to avoid using stale data from previously
 450                  * used settings, e.g. when configuration and endpoints were
 451                  * changed
 452                  */
 453
 454                 subs->sync_endpoint = NULL;
 455                 subs->data_endpoint->sync_master = NULL;
 456         }
 457
 458         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 459         if (err < 0)
 460                 return err;
 461
 462         /* endpoint set by quirk */
 463         if (err > 0)
 464                 return 0;
 465
 466         if (altsd->bNumEndpoints < 2)
 467                 return 0;
 468
 469         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 470                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 471             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 472                 return 0;
 473
 474         /*
 475          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 476          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 477          * error fall back to SYNC mode and don't create sync endpoint
 478          */
 479
 480         /* check sync-pipe endpoint */
 481         /* ... and check descriptor size before accessing bSynchAddress
 482            because there is a version of the SB Audigy 2 NX firmware lacking
 483            the audio fields in the endpoint descriptors */
 484         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 485             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 486              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 487                 dev_err(&dev->dev,
 488                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 489                            fmt->iface, fmt->altsetting,
 490                            get_endpoint(alts, 1)->bmAttributes,
 491                            get_endpoint(alts, 1)->bLength,
 492                            get_endpoint(alts, 1)->bSynchAddress);
 493                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 494                         return 0;
 495                 return -EINVAL;
 496         }
 497         ep = get_endpoint(alts, 1)->bEndpointAddress;
 498         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 499             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 500             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 501              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 502                 dev_err(&dev->dev,
 503                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 504                            fmt->iface, fmt->altsetting,
 505                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 506                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 507                         return 0;
 508                 return -EINVAL;
 509         }
 510
 511         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 512                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 513
 514         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 515                                                    alts, ep, !subs->direction,
 516                                                    implicit_fb ?
 517                                                         SND_USB_ENDPOINT_TYPE_DATA :
 518                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 519
 520         if (!subs->sync_endpoint) {
 521                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 522                         return 0;
 523                 return -EINVAL;
 524         }
 525
 526         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 527
 528         subs->data_endpoint->sync_master = subs->sync_endpoint;
 529
 530         return 0;
 531 }
 532
 533 /*
 534  * find a matching format and set up the interface
 535  */
 536 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 537 {
 538         struct usb_device *dev = subs->dev;
 539         struct usb_host_interface *alts;
 540         struct usb_interface_descriptor *altsd;
 541         struct usb_interface *iface;
 542         int err;
 543
 544         iface = usb_ifnum_to_if(dev, fmt->iface);
 545         if (WARN_ON(!iface))
 546                 return -EINVAL;
 547         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 548         if (WARN_ON(!alts))
 549                 return -EINVAL;
 550         altsd = get_iface_desc(alts);
 551
 552         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 553                 return 0;
 554
 555         /* close the old interface */
 556         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 557                 if (!subs->stream->chip->keep_iface) {
 558                         err = usb_set_interface(subs->dev, subs->interface, 0);
 559                         if (err < 0) {
 560                                 dev_err(&dev->dev,
 561                                         "%d:%d: return to setting 0 failed (%d)\n",
 562                                         fmt->iface, fmt->altsetting, err);
 563                                 return -EIO;
 564                         }
 565                 }
 566                 subs->interface = -1;
 567                 subs->altset_idx = 0;
 568         }
 569
 570         if (subs->need_setup_fmt)
 571                 subs->need_setup_fmt = false;
 572
 573         /* set interface */
 574         if (iface->cur_altsetting != alts) {
 575                 err = snd_usb_select_mode_quirk(subs, fmt);
 576                 if (err < 0)
 577                         return -EIO;
 578
 579                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 580                 if (err < 0) {
 581                         dev_err(&dev->dev,
 582                                 "%d:%d: usb_set_interface failed (%d)\n",
 583                                 fmt->iface, fmt->altsetting, err);
 584                         return -EIO;
 585                 }
 586                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 587                         fmt->iface, fmt->altsetting);
 588                 snd_usb_set_interface_quirk(dev);
 589         }
 590
 591         subs->interface = fmt->iface;
 592         subs->altset_idx = fmt->altset_idx;
 593         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 594                                                    alts, fmt->endpoint, subs->direction,
 595                                                    SND_USB_ENDPOINT_TYPE_DATA);
 596
 597         if (!subs->data_endpoint)
 598                 return -EINVAL;
 599
 600         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 601         if (err < 0)
 602                 return err;
 603
 604         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 605         if (err < 0)
 606                 return err;
 607
 608         subs->cur_audiofmt = fmt;
 609
 610         snd_usb_set_format_quirk(subs, fmt);
 611
 612         return 0;
 613 }
 614
 615 /*
 616  * Return the score of matching two audioformats.
 617  * Veto the audioformat if:
 618  * - It has no channels for some reason.
 619  * - Requested PCM format is not supported.
 620  * - Requested sample rate is not supported.
 621  */
 622 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 623                                        struct audioformat *fp,
 624                                        struct audioformat *match, int rate,
 625                                        snd_pcm_format_t pcm_format)
 626 {
 627         int i;
 628         int score = 0;
 629
 630         if (fp->channels < 1) {
 631                 dev_dbg(&subs->dev->dev,
 632                         "%s: (fmt @%p) no channels\n", __func__, fp);
 633                 return 0;
 634         }
 635
 636         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 637                 dev_dbg(&subs->dev->dev,
 638                         "%s: (fmt @%p) no match for format %d\n", __func__,
 639                         fp, pcm_format);
 640                 return 0;
 641         }
 642
 643         for (i = 0; i < fp->nr_rates; i++) {
 644                 if (fp->rate_table[i] == rate) {
 645                         score++;
 646                         break;
 647                 }
 648         }
 649         if (!score) {
 650                 dev_dbg(&subs->dev->dev,
 651                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 652                         fp, rate);
 653                 return 0;
 654         }
 655
 656         if (fp->channels == match->channels)
 657                 score++;
 658
 659         dev_dbg(&subs->dev->dev,
 660                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 661
 662         return score;
 663 }
 664
 665 /*
 666  * Configure the sync ep using the rate and pcm format of the data ep.
 667  */
 668 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 669 {
 670         int ret;
 671         struct audioformat *fp;
 672         struct audioformat *sync_fp = NULL;
 673         int cur_score = 0;
 674         int sync_period_bytes = subs->period_bytes;
 675         struct snd_usb_substream *sync_subs =
 676                 &subs->stream->substream[subs->direction ^ 1];
 677
 678         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 679             !subs->stream)
 680                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 681                                                    subs->pcm_format,
 682                                                    subs->channels,
 683                                                    subs->period_bytes,
 684                                                    0, 0,
 685                                                    subs->cur_rate,
 686                                                    subs->cur_audiofmt,
 687                                                    NULL);
 688
 689         /* Try to find the best matching audioformat. */
 690         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 691                 int score = match_endpoint_audioformats(subs,
 692                                                         fp, subs->cur_audiofmt,
 693                         subs->cur_rate, subs->pcm_format);
 694
 695                 if (score > cur_score) {
 696                         sync_fp = fp;
 697                         cur_score = score;
 698                 }
 699         }
 700
 701         if (unlikely(sync_fp == NULL)) {
 702                 dev_err(&subs->dev->dev,
 703                         "%s: no valid audioformat for sync ep %x found\n",
 704                         __func__, sync_subs->ep_num);
 705                 return -EINVAL;
 706         }
 707
 708         /*
 709          * Recalculate the period bytes if channel number differ between
 710          * data and sync ep audioformat.
 711          */
 712         if (sync_fp->channels != subs->channels) {
 713                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 714                         sync_fp->channels;
 715                 dev_dbg(&subs->dev->dev,
 716                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 717                         __func__, subs->period_bytes, sync_period_bytes);
 718         }
 719
 720         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 721                                           subs->pcm_format,
 722                                           sync_fp->channels,
 723                                           sync_period_bytes,
 724                                           0, 0,
 725                                           subs->cur_rate,
 726                                           sync_fp,
 727                                           NULL);
 728
 729         return ret;
 730 }
 731
 732 /*
 733  * configure endpoint params
 734  *
 735  * called  during initial setup and upon resume
 736  */
 737 static int configure_endpoint(struct snd_usb_substream *subs)
 738 {
 739         int ret;
 740
 741         /* format changed */
 742         stop_endpoints(subs);
 743         sync_pending_stops(subs);
 744         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 745                                           subs->pcm_format,
 746                                           subs->channels,
 747                                           subs->period_bytes,
 748                                           subs->period_frames,
 749                                           subs->buffer_periods,
 750                                           subs->cur_rate,
 751                                           subs->cur_audiofmt,
 752                                           subs->sync_endpoint);
 753         if (ret < 0)
 754                 return ret;
 755
 756         if (subs->sync_endpoint)
 757                 ret = configure_sync_endpoint(subs);
 758
 759         return ret;
 760 }
 761
 762 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 763 {
 764         int ret;
 765
 766         if (!subs->str_pd)
 767                 return 0;
 768
 769         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 770         if (ret < 0) {
 771                 dev_err(&subs->dev->dev,
 772                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 773                         subs->str_pd->pd_id, state, ret);
 774                 return ret;
 775         }
 776
 777         return 0;
 778 }
 779
 780 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 781 {
 782         int ret;
 783
 784         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 785         if (ret < 0)
 786                 return ret;
 787
 788         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 789         if (ret < 0)
 790                 return ret;
 791
 792         return 0;
 793 }
 794
 795 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 796 {
 797         int ret;
 798
 799         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 800         if (ret < 0)
 801                 return ret;
 802
 803         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 804         if (ret < 0)
 805                 return ret;
 806
 807         return 0;
 808 }
 809
 810 /*
 811  * hw_params callback
 812  *
 813  * allocate a buffer and set the given audio format.
 814  *
 815  * so far we use a physically linear buffer although packetize transfer
 816  * doesn't need a continuous area.
 817  * if sg buffer is supported on the later version of alsa, we'll follow
 818  * that.
 819  */
 820 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 821                              struct snd_pcm_hw_params *hw_params)
 822 {
 823         struct snd_usb_substream *subs = substream->runtime->private_data;
 824         struct audioformat *fmt;
 825         int ret;
 826
 827         ret = snd_media_start_pipeline(subs);
 828         if (ret)
 829                 return ret;
 830
 831         subs->pcm_format = params_format(hw_params);
 832         subs->period_bytes = params_period_bytes(hw_params);
 833         subs->period_frames = params_period_size(hw_params);
 834         subs->buffer_periods = params_periods(hw_params);
 835         subs->channels = params_channels(hw_params);
 836         subs->cur_rate = params_rate(hw_params);
 837
 838         fmt = find_format(subs);
 839         if (!fmt) {
 840                 dev_dbg(&subs->dev->dev,
 841                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 842                            subs->pcm_format, subs->cur_rate, subs->channels);
 843                 ret = -EINVAL;
 844                 goto stop_pipeline;
 845         }
 846
 847         ret = snd_usb_lock_shutdown(subs->stream->chip);
 848         if (ret < 0)
 849                 goto stop_pipeline;
 850
 851         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 852         if (ret < 0)
 853                 goto unlock;
 854
 855         ret = set_format(subs, fmt);
 856         if (ret < 0)
 857                 goto unlock;
 858
 859         subs->interface = fmt->iface;
 860         subs->altset_idx = fmt->altset_idx;
 861         subs->need_setup_ep = true;
 862
 863  unlock:
 864         snd_usb_unlock_shutdown(subs->stream->chip);
 865         if (ret < 0)
 866                 goto stop_pipeline;
 867         return ret;
 868
 869  stop_pipeline:
 870         snd_media_stop_pipeline(subs);
 871         return ret;
 872 }
 873
 874 /*
 875  * hw_free callback
 876  *
 877  * reset the audio format and release the buffer
 878  */
 879 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 880 {
 881         struct snd_usb_substream *subs = substream->runtime->private_data;
 882
 883         snd_media_stop_pipeline(subs);
 884         subs->cur_audiofmt = NULL;
 885         subs->cur_rate = 0;
 886         subs->period_bytes = 0;
 887         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 888                 stop_endpoints(subs);
 889                 sync_pending_stops(subs);
 890                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 891                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 892                 snd_usb_unlock_shutdown(subs->stream->chip);
 893         }
 894
 895         return 0;
 896 }
 897
 898 /*
 899  * prepare callback
 900  *
 901  * only a few subtle things...
 902  */
 903 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 904 {
 905         struct snd_pcm_runtime *runtime = substream->runtime;
 906         struct snd_usb_substream *subs = runtime->private_data;
 907         struct usb_host_interface *alts;
 908         struct usb_interface *iface;
 909         int ret;
 910
 911         if (! subs->cur_audiofmt) {
 912                 dev_err(&subs->dev->dev, "no format is specified!\n");
 913                 return -ENXIO;
 914         }
 915
 916         ret = snd_usb_lock_shutdown(subs->stream->chip);
 917         if (ret < 0)
 918                 return ret;
 919         if (snd_BUG_ON(!subs->data_endpoint)) {
 920                 ret = -EIO;
 921                 goto unlock;
 922         }
 923
 924         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 925         if (ret < 0)
 926                 goto unlock;
 927
 928         ret = set_format(subs, subs->cur_audiofmt);
 929         if (ret < 0)
 930                 goto unlock;
 931
 932         if (subs->need_setup_ep) {
 933
 934                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 935                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 936                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 937                                                subs->cur_audiofmt->iface,
 938                                                alts,
 939                                                subs->cur_audiofmt,
 940                                                subs->cur_rate);
 941                 if (ret < 0)
 942                         goto unlock;
 943
 944                 ret = configure_endpoint(subs);
 945                 if (ret < 0)
 946                         goto unlock;
 947                 subs->need_setup_ep = false;
 948         }
 949
 950         /* some unit conversions in runtime */
 951         subs->data_endpoint->maxframesize =
 952                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 953         subs->data_endpoint->curframesize =
 954                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 955
 956         /* reset the pointer */
 957         subs->hwptr_done = 0;
 958         subs->transfer_done = 0;
 959         subs->last_delay = 0;
 960         subs->last_frame_number = 0;
 961         runtime->delay = 0;
 962
 963         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 964          * updates for all URBs would happen at the same time when starting */
 965         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 966                 ret = start_endpoints(subs);
 967
 968  unlock:
 969         snd_usb_unlock_shutdown(subs->stream->chip);
 970         return ret;
 971 }
 972
 973 static const struct snd_pcm_hardware snd_usb_hardware =
 974 {
 975         .info =                 SNDRV_PCM_INFO_MMAP |
 976                                 SNDRV_PCM_INFO_MMAP_VALID |
 977                                 SNDRV_PCM_INFO_BATCH |
 978                                 SNDRV_PCM_INFO_INTERLEAVED |
 979                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 980                                 SNDRV_PCM_INFO_PAUSE,
 981         .buffer_bytes_max =     1024 * 1024,
 982         .period_bytes_min =     64,
 983         .period_bytes_max =     512 * 1024,
 984         .periods_min =          2,
 985         .periods_max =          1024,
 986 };
 987
 988 static int hw_check_valid_format(struct snd_usb_substream *subs,
 989                                  struct snd_pcm_hw_params *params,
 990                                  struct audioformat *fp)
 991 {
 992         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 993         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 994         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 995         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 996         struct snd_mask check_fmts;
 997         unsigned int ptime;
 998
 999         /* check the format */
1000         snd_mask_none(&check_fmts);
1001         check_fmts.bits[0] = (u32)fp->formats;
1002         check_fmts.bits[1] = (u32)(fp->formats >> 32);
1003         snd_mask_intersect(&check_fmts, fmts);
1004         if (snd_mask_empty(&check_fmts)) {
1005                 hwc_debug("   > check: no supported format %d\n", fp->format);
1006                 return 0;
1007         }
1008         /* check the channels */
1009         if (fp->channels < ct->min || fp->channels > ct->max) {
1010                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1011                 return 0;
1012         }
1013         /* check the rate is within the range */
1014         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1015                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1016                 return 0;
1017         }
1018         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1019                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1020                 return 0;
1021         }
1022         /* check whether the period time is >= the data packet interval */
1023         if (subs->speed != USB_SPEED_FULL) {
1024                 ptime = 125 * (1 << fp->datainterval);
1025                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1026                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1027                         return 0;
1028                 }
1029         }
1030         return 1;
1031 }
1032
1033 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1034                         struct snd_pcm_hw_rule *rule)
1035 {
1036         struct snd_usb_substream *subs = rule->private;
1037         struct audioformat *fp;
1038         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1039         unsigned int rmin, rmax;
1040         int changed;
1041
1042         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1043         changed = 0;
1044         rmin = rmax = 0;
1045         list_for_each_entry(fp, &subs->fmt_list, list) {
1046                 if (!hw_check_valid_format(subs, params, fp))
1047                         continue;
1048                 if (changed++) {
1049                         if (rmin > fp->rate_min)
1050                                 rmin = fp->rate_min;
1051                         if (rmax < fp->rate_max)
1052                                 rmax = fp->rate_max;
1053                 } else {
1054                         rmin = fp->rate_min;
1055                         rmax = fp->rate_max;
1056                 }
1057         }
1058
1059         if (!changed) {
1060                 hwc_debug("  --> get empty\n");
1061                 it->empty = 1;
1062                 return -EINVAL;
1063         }
1064
1065         changed = 0;
1066         if (it->min < rmin) {
1067                 it->min = rmin;
1068                 it->openmin = 0;
1069                 changed = 1;
1070         }
1071         if (it->max > rmax) {
1072                 it->max = rmax;
1073                 it->openmax = 0;
1074                 changed = 1;
1075         }
1076         if (snd_interval_checkempty(it)) {
1077                 it->empty = 1;
1078                 return -EINVAL;
1079         }
1080         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1081         return changed;
1082 }
1083
1084
1085 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1086                             struct snd_pcm_hw_rule *rule)
1087 {
1088         struct snd_usb_substream *subs = rule->private;
1089         struct audioformat *fp;
1090         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1091         unsigned int rmin, rmax;
1092         int changed;
1093
1094         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1095         changed = 0;
1096         rmin = rmax = 0;
1097         list_for_each_entry(fp, &subs->fmt_list, list) {
1098                 if (!hw_check_valid_format(subs, params, fp))
1099                         continue;
1100                 if (changed++) {
1101                         if (rmin > fp->channels)
1102                                 rmin = fp->channels;
1103                         if (rmax < fp->channels)
1104                                 rmax = fp->channels;
1105                 } else {
1106                         rmin = fp->channels;
1107                         rmax = fp->channels;
1108                 }
1109         }
1110
1111         if (!changed) {
1112                 hwc_debug("  --> get empty\n");
1113                 it->empty = 1;
1114                 return -EINVAL;
1115         }
1116
1117         changed = 0;
1118         if (it->min < rmin) {
1119                 it->min = rmin;
1120                 it->openmin = 0;
1121                 changed = 1;
1122         }
1123         if (it->max > rmax) {
1124                 it->max = rmax;
1125                 it->openmax = 0;
1126                 changed = 1;
1127         }
1128         if (snd_interval_checkempty(it)) {
1129                 it->empty = 1;
1130                 return -EINVAL;
1131         }
1132         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1133         return changed;
1134 }
1135
1136 static int hw_rule_format(struct snd_pcm_hw_params *params,
1137                           struct snd_pcm_hw_rule *rule)
1138 {
1139         struct snd_usb_substream *subs = rule->private;
1140         struct audioformat *fp;
1141         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1142         u64 fbits;
1143         u32 oldbits[2];
1144         int changed;
1145
1146         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1147         fbits = 0;
1148         list_for_each_entry(fp, &subs->fmt_list, list) {
1149                 if (!hw_check_valid_format(subs, params, fp))
1150                         continue;
1151                 fbits |= fp->formats;
1152         }
1153
1154         oldbits[0] = fmt->bits[0];
1155         oldbits[1] = fmt->bits[1];
1156         fmt->bits[0] &= (u32)fbits;
1157         fmt->bits[1] &= (u32)(fbits >> 32);
1158         if (!fmt->bits[0] && !fmt->bits[1]) {
1159                 hwc_debug("  --> get empty\n");
1160                 return -EINVAL;
1161         }
1162         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1163         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1164         return changed;
1165 }
1166
1167 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1168                                struct snd_pcm_hw_rule *rule)
1169 {
1170         struct snd_usb_substream *subs = rule->private;
1171         struct audioformat *fp;
1172         struct snd_interval *it;
1173         unsigned char min_datainterval;
1174         unsigned int pmin;
1175         int changed;
1176
1177         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1178         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1179         min_datainterval = 0xff;
1180         list_for_each_entry(fp, &subs->fmt_list, list) {
1181                 if (!hw_check_valid_format(subs, params, fp))
1182                         continue;
1183                 min_datainterval = min(min_datainterval, fp->datainterval);
1184         }
1185         if (min_datainterval == 0xff) {
1186                 hwc_debug("  --> get empty\n");
1187                 it->empty = 1;
1188                 return -EINVAL;
1189         }
1190         pmin = 125 * (1 << min_datainterval);
1191         changed = 0;
1192         if (it->min < pmin) {
1193                 it->min = pmin;
1194                 it->openmin = 0;
1195                 changed = 1;
1196         }
1197         if (snd_interval_checkempty(it)) {
1198                 it->empty = 1;
1199                 return -EINVAL;
1200         }
1201         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1202         return changed;
1203 }
1204
1205 /*
1206  *  If the device supports unusual bit rates, does the request meet these?
1207  */
1208 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1209                                   struct snd_usb_substream *subs)
1210 {
1211         struct audioformat *fp;
1212         int *rate_list;
1213         int count = 0, needs_knot = 0;
1214         int err;
1215
1216         kfree(subs->rate_list.list);
1217         subs->rate_list.list = NULL;
1218
1219         list_for_each_entry(fp, &subs->fmt_list, list) {
1220                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1221                         return 0;
1222                 count += fp->nr_rates;
1223                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1224                         needs_knot = 1;
1225         }
1226         if (!needs_knot)
1227                 return 0;
1228
1229         subs->rate_list.list = rate_list =
1230                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1231         if (!subs->rate_list.list)
1232                 return -ENOMEM;
1233         subs->rate_list.count = count;
1234         subs->rate_list.mask = 0;
1235         count = 0;
1236         list_for_each_entry(fp, &subs->fmt_list, list) {
1237                 int i;
1238                 for (i = 0; i < fp->nr_rates; i++)
1239                         rate_list[count++] = fp->rate_table[i];
1240         }
1241         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1242                                          &subs->rate_list);
1243         if (err < 0)
1244                 return err;
1245
1246         return 0;
1247 }
1248
1249
1250 /*
1251  * set up the runtime hardware information.
1252  */
1253
1254 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1255 {
1256         struct audioformat *fp;
1257         unsigned int pt, ptmin;
1258         int param_period_time_if_needed;
1259         int err;
1260
1261         runtime->hw.formats = subs->formats;
1262
1263         runtime->hw.rate_min = 0x7fffffff;
1264         runtime->hw.rate_max = 0;
1265         runtime->hw.channels_min = 256;
1266         runtime->hw.channels_max = 0;
1267         runtime->hw.rates = 0;
1268         ptmin = UINT_MAX;
1269         /* check min/max rates and channels */
1270         list_for_each_entry(fp, &subs->fmt_list, list) {
1271                 runtime->hw.rates |= fp->rates;
1272                 if (runtime->hw.rate_min > fp->rate_min)
1273                         runtime->hw.rate_min = fp->rate_min;
1274                 if (runtime->hw.rate_max < fp->rate_max)
1275                         runtime->hw.rate_max = fp->rate_max;
1276                 if (runtime->hw.channels_min > fp->channels)
1277                         runtime->hw.channels_min = fp->channels;
1278                 if (runtime->hw.channels_max < fp->channels)
1279                         runtime->hw.channels_max = fp->channels;
1280                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1281                         /* FIXME: there might be more than one audio formats... */
1282                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1283                                 fp->frame_size;
1284                 }
1285                 pt = 125 * (1 << fp->datainterval);
1286                 ptmin = min(ptmin, pt);
1287         }
1288
1289         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1290         if (subs->speed == USB_SPEED_FULL)
1291                 /* full speed devices have fixed data packet interval */
1292                 ptmin = 1000;
1293         if (ptmin == 1000)
1294                 /* if period time doesn't go below 1 ms, no rules needed */
1295                 param_period_time_if_needed = -1;
1296
1297         err = snd_pcm_hw_constraint_minmax(runtime,
1298                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1299                                            ptmin, UINT_MAX);
1300         if (err < 0)
1301                 return err;
1302
1303         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1304                                   hw_rule_rate, subs,
1305                                   SNDRV_PCM_HW_PARAM_FORMAT,
1306                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1307                                   param_period_time_if_needed,
1308                                   -1);
1309         if (err < 0)
1310                 return err;
1311         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1312                                   hw_rule_channels, subs,
1313                                   SNDRV_PCM_HW_PARAM_FORMAT,
1314                                   SNDRV_PCM_HW_PARAM_RATE,
1315                                   param_period_time_if_needed,
1316                                   -1);
1317         if (err < 0)
1318                 return err;
1319         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1320                                   hw_rule_format, subs,
1321                                   SNDRV_PCM_HW_PARAM_RATE,
1322                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1323                                   param_period_time_if_needed,
1324                                   -1);
1325         if (err < 0)
1326                 return err;
1327         if (param_period_time_if_needed >= 0) {
1328                 err = snd_pcm_hw_rule_add(runtime, 0,
1329                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1330                                           hw_rule_period_time, subs,
1331                                           SNDRV_PCM_HW_PARAM_FORMAT,
1332                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1333                                           SNDRV_PCM_HW_PARAM_RATE,
1334                                           -1);
1335                 if (err < 0)
1336                         return err;
1337         }
1338         err = snd_usb_pcm_check_knot(runtime, subs);
1339         if (err < 0)
1340                 return err;
1341
1342         return snd_usb_autoresume(subs->stream->chip);
1343 }
1344
1345 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1346 {
1347         int direction = substream->stream;
1348         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1349         struct snd_pcm_runtime *runtime = substream->runtime;
1350         struct snd_usb_substream *subs = &as->substream[direction];
1351         int ret;
1352
1353         subs->interface = -1;
1354         subs->altset_idx = 0;
1355         runtime->hw = snd_usb_hardware;
1356         runtime->private_data = subs;
1357         subs->pcm_substream = substream;
1358         /* runtime PM is also done there */
1359
1360         /* initialize DSD/DOP context */
1361         subs->dsd_dop.byte_idx = 0;
1362         subs->dsd_dop.channel = 0;
1363         subs->dsd_dop.marker = 1;
1364
1365         ret = setup_hw_info(runtime, subs);
1366         if (ret == 0) {
1367                 ret = snd_media_stream_init(subs, as->pcm, direction);
1368                 if (ret)
1369                         snd_usb_autosuspend(subs->stream->chip);
1370         }
1371         return ret;
1372 }
1373
1374 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1375 {
1376         int direction = substream->stream;
1377         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1378         struct snd_usb_substream *subs = &as->substream[direction];
1379         int ret;
1380
1381         snd_media_stop_pipeline(subs);
1382
1383         if (!as->chip->keep_iface &&
1384             subs->interface >= 0 &&
1385             !snd_usb_lock_shutdown(subs->stream->chip)) {
1386                 usb_set_interface(subs->dev, subs->interface, 0);
1387                 subs->interface = -1;
1388                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1389                 snd_usb_unlock_shutdown(subs->stream->chip);
1390                 if (ret < 0)
1391                         return ret;
1392         }
1393
1394         subs->pcm_substream = NULL;
1395         snd_usb_autosuspend(subs->stream->chip);
1396
1397         return 0;
1398 }
1399
1400 /* Since a URB can handle only a single linear buffer, we must use double
1401  * buffering when the data to be transferred overflows the buffer boundary.
1402  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1403  * for all URBs.
1404  */
1405 static void retire_capture_urb(struct snd_usb_substream *subs,
1406                                struct urb *urb)
1407 {
1408         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1409         unsigned int stride, frames, bytes, oldptr;
1410         int i, period_elapsed = 0;
1411         unsigned long flags;
1412         unsigned char *cp;
1413         int current_frame_number;
1414
1415         /* read frame number here, update pointer in critical section */
1416         current_frame_number = usb_get_current_frame_number(subs->dev);
1417
1418         stride = runtime->frame_bits >> 3;
1419
1420         for (i = 0; i < urb->number_of_packets; i++) {
1421                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1422                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1423                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1424                                 i, urb->iso_frame_desc[i].status);
1425                         // continue;
1426                 }
1427                 bytes = urb->iso_frame_desc[i].actual_length;
1428                 if (subs->stream_offset_adj > 0) {
1429                         unsigned int adj = min(subs->stream_offset_adj, bytes);
1430                         cp += adj;
1431                         bytes -= adj;
1432                         subs->stream_offset_adj -= adj;
1433                 }
1434                 frames = bytes / stride;
1435                 if (!subs->txfr_quirk)
1436                         bytes = frames * stride;
1437                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1438                         int oldbytes = bytes;
1439                         bytes = frames * stride;
1440                         dev_warn_ratelimited(&subs->dev->dev,
1441                                  "Corrected urb data len. %d->%d\n",
1442                                                         oldbytes, bytes);
1443                 }
1444                 /* update the current pointer */
1445                 spin_lock_irqsave(&subs->lock, flags);
1446                 oldptr = subs->hwptr_done;
1447                 subs->hwptr_done += bytes;
1448                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1449                         subs->hwptr_done -= runtime->buffer_size * stride;
1450                 frames = (bytes + (oldptr % stride)) / stride;
1451                 subs->transfer_done += frames;
1452                 if (subs->transfer_done >= runtime->period_size) {
1453                         subs->transfer_done -= runtime->period_size;
1454                         period_elapsed = 1;
1455                 }
1456                 /* capture delay is by construction limited to one URB,
1457                  * reset delays here
1458                  */
1459                 runtime->delay = subs->last_delay = 0;
1460
1461                 /* realign last_frame_number */
1462                 subs->last_frame_number = current_frame_number;
1463                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1464
1465                 spin_unlock_irqrestore(&subs->lock, flags);
1466                 /* copy a data chunk */
1467                 if (oldptr + bytes > runtime->buffer_size * stride) {
1468                         unsigned int bytes1 =
1469                                         runtime->buffer_size * stride - oldptr;
1470                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1471                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1472                 } else {
1473                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1474                 }
1475         }
1476
1477         if (period_elapsed)
1478                 snd_pcm_period_elapsed(subs->pcm_substream);
1479 }
1480
1481 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1482                                              struct urb *urb, unsigned int bytes)
1483 {
1484         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1485         unsigned int stride = runtime->frame_bits >> 3;
1486         unsigned int dst_idx = 0;
1487         unsigned int src_idx = subs->hwptr_done;
1488         unsigned int wrap = runtime->buffer_size * stride;
1489         u8 *dst = urb->transfer_buffer;
1490         u8 *src = runtime->dma_area;
1491         u8 marker[] = { 0x05, 0xfa };
1492
1493         /*
1494          * The DSP DOP format defines a way to transport DSD samples over
1495          * normal PCM data endpoints. It requires stuffing of marker bytes
1496          * (0x05 and 0xfa, alternating per sample frame), and then expects
1497          * 2 additional bytes of actual payload. The whole frame is stored
1498          * LSB.
1499          *
1500          * Hence, for a stereo transport, the buffer layout looks like this,
1501          * where L refers to left channel samples and R to right.
1502          *
1503          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1504          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1505          *   .....
1506          *
1507          */
1508
1509         while (bytes--) {
1510                 if (++subs->dsd_dop.byte_idx == 3) {
1511                         /* frame boundary? */
1512                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1513                         src_idx += 2;
1514                         subs->dsd_dop.byte_idx = 0;
1515
1516                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1517                                 /* alternate the marker */
1518                                 subs->dsd_dop.marker++;
1519                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1520                                 subs->dsd_dop.channel = 0;
1521                         }
1522                 } else {
1523                         /* stuff the DSD payload */
1524                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1525
1526                         if (subs->cur_audiofmt->dsd_bitrev)
1527                                 dst[dst_idx++] = bitrev8(src[idx]);
1528                         else
1529                                 dst[dst_idx++] = src[idx];
1530
1531                         subs->hwptr_done++;
1532                 }
1533         }
1534         if (subs->hwptr_done >= runtime->buffer_size * stride)
1535                 subs->hwptr_done -= runtime->buffer_size * stride;
1536 }
1537
1538 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1539                         int offset, int stride, unsigned int bytes)
1540 {
1541         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1542
1543         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1544                 /* err, the transferred area goes over buffer boundary. */
1545                 unsigned int bytes1 =
1546                         runtime->buffer_size * stride - subs->hwptr_done;
1547                 memcpy(urb->transfer_buffer + offset,
1548                        runtime->dma_area + subs->hwptr_done, bytes1);
1549                 memcpy(urb->transfer_buffer + offset + bytes1,
1550                        runtime->dma_area, bytes - bytes1);
1551         } else {
1552                 memcpy(urb->transfer_buffer + offset,
1553                        runtime->dma_area + subs->hwptr_done, bytes);
1554         }
1555         subs->hwptr_done += bytes;
1556         if (subs->hwptr_done >= runtime->buffer_size * stride)
1557                 subs->hwptr_done -= runtime->buffer_size * stride;
1558 }
1559
1560 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1561                                       struct urb *urb, int stride,
1562                                       unsigned int bytes)
1563 {
1564         __le32 packet_length;
1565         int i;
1566
1567         /* Put __le32 length descriptor at start of each packet. */
1568         for (i = 0; i < urb->number_of_packets; i++) {
1569                 unsigned int length = urb->iso_frame_desc[i].length;
1570                 unsigned int offset = urb->iso_frame_desc[i].offset;
1571
1572                 packet_length = cpu_to_le32(length);
1573                 offset += i * sizeof(packet_length);
1574                 urb->iso_frame_desc[i].offset = offset;
1575                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1576                 memcpy(urb->transfer_buffer + offset,
1577                        &packet_length, sizeof(packet_length));
1578                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1579                             stride, length);
1580         }
1581         /* Adjust transfer size accordingly. */
1582         bytes += urb->number_of_packets * sizeof(packet_length);
1583         return bytes;
1584 }
1585
1586 static void prepare_playback_urb(struct snd_usb_substream *subs,
1587                                  struct urb *urb)
1588 {
1589         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1590         struct snd_usb_endpoint *ep = subs->data_endpoint;
1591         struct snd_urb_ctx *ctx = urb->context;
1592         unsigned int counts, frames, bytes;
1593         int i, stride, period_elapsed = 0;
1594         unsigned long flags;
1595
1596         stride = runtime->frame_bits >> 3;
1597
1598         frames = 0;
1599         urb->number_of_packets = 0;
1600         spin_lock_irqsave(&subs->lock, flags);
1601         subs->frame_limit += ep->max_urb_frames;
1602         for (i = 0; i < ctx->packets; i++) {
1603                 if (ctx->packet_size[i])
1604                         counts = ctx->packet_size[i];
1605                 else if (ep->sync_master)
1606                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1607                 else
1608                         counts = snd_usb_endpoint_next_packet_size(ep);
1609
1610                 /* set up descriptor */
1611                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1612                 urb->iso_frame_desc[i].length = counts * ep->stride;
1613                 frames += counts;
1614                 urb->number_of_packets++;
1615                 subs->transfer_done += counts;
1616                 if (subs->transfer_done >= runtime->period_size) {
1617                         subs->transfer_done -= runtime->period_size;
1618                         subs->frame_limit = 0;
1619                         period_elapsed = 1;
1620                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1621                                 if (subs->transfer_done > 0) {
1622                                         /* FIXME: fill-max mode is not
1623                                          * supported yet */
1624                                         frames -= subs->transfer_done;
1625                                         counts -= subs->transfer_done;
1626                                         urb->iso_frame_desc[i].length =
1627                                                 counts * ep->stride;
1628                                         subs->transfer_done = 0;
1629                                 }
1630                                 i++;
1631                                 if (i < ctx->packets) {
1632                                         /* add a transfer delimiter */
1633                                         urb->iso_frame_desc[i].offset =
1634                                                 frames * ep->stride;
1635                                         urb->iso_frame_desc[i].length = 0;
1636                                         urb->number_of_packets++;
1637                                 }
1638                                 break;
1639                         }
1640                 }
1641                 /* finish at the period boundary or after enough frames */
1642                 if ((period_elapsed ||
1643                                 subs->transfer_done >= subs->frame_limit) &&
1644                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1645                         break;
1646         }
1647         bytes = frames * ep->stride;
1648
1649         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1650                      subs->cur_audiofmt->dsd_dop)) {
1651                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1652         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1653                            subs->cur_audiofmt->dsd_bitrev)) {
1654                 /* bit-reverse the bytes */
1655                 u8 *buf = urb->transfer_buffer;
1656                 for (i = 0; i < bytes; i++) {
1657                         int idx = (subs->hwptr_done + i)
1658                                 % (runtime->buffer_size * stride);
1659                         buf[i] = bitrev8(runtime->dma_area[idx]);
1660                 }
1661
1662                 subs->hwptr_done += bytes;
1663                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1664                         subs->hwptr_done -= runtime->buffer_size * stride;
1665         } else {
1666                 /* usual PCM */
1667                 if (!subs->tx_length_quirk)
1668                         copy_to_urb(subs, urb, 0, stride, bytes);
1669                 else
1670                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1671                         /* bytes is now amount of outgoing data */
1672         }
1673
1674         /* update delay with exact number of samples queued */
1675         runtime->delay = subs->last_delay;
1676         runtime->delay += frames;
1677         subs->last_delay = runtime->delay;
1678
1679         /* realign last_frame_number */
1680         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1681         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1682
1683         if (subs->trigger_tstamp_pending_update) {
1684                 /* this is the first actual URB submitted,
1685                  * update trigger timestamp to reflect actual start time
1686                  */
1687                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1688                 subs->trigger_tstamp_pending_update = false;
1689         }
1690
1691         spin_unlock_irqrestore(&subs->lock, flags);
1692         urb->transfer_buffer_length = bytes;
1693         if (period_elapsed)
1694                 snd_pcm_period_elapsed(subs->pcm_substream);
1695 }
1696
1697 /*
1698  * process after playback data complete
1699  * - decrease the delay count again
1700  */
1701 static void retire_playback_urb(struct snd_usb_substream *subs,
1702                                struct urb *urb)
1703 {
1704         unsigned long flags;
1705         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1706         struct snd_usb_endpoint *ep = subs->data_endpoint;
1707         int processed = urb->transfer_buffer_length / ep->stride;
1708         int est_delay;
1709
1710         /* ignore the delay accounting when processed=0 is given, i.e.
1711          * silent payloads are processed before handling the actual data
1712          */
1713         if (!processed)
1714                 return;
1715
1716         spin_lock_irqsave(&subs->lock, flags);
1717         if (!subs->last_delay)
1718                 goto out; /* short path */
1719
1720         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1721         /* update delay with exact number of samples played */
1722         if (processed > subs->last_delay)
1723                 subs->last_delay = 0;
1724         else
1725                 subs->last_delay -= processed;
1726         runtime->delay = subs->last_delay;
1727
1728         /*
1729          * Report when delay estimate is off by more than 2ms.
1730          * The error should be lower than 2ms since the estimate relies
1731          * on two reads of a counter updated every ms.
1732          */
1733         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1734                 dev_dbg_ratelimited(&subs->dev->dev,
1735                         "delay: estimated %d, actual %d\n",
1736                         est_delay, subs->last_delay);
1737
1738         if (!subs->running) {
1739                 /* update last_frame_number for delay counting here since
1740                  * prepare_playback_urb won't be called during pause
1741                  */
1742                 subs->last_frame_number =
1743                         usb_get_current_frame_number(subs->dev) & 0xff;
1744         }
1745
1746  out:
1747         spin_unlock_irqrestore(&subs->lock, flags);
1748 }
1749
1750 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1751                                               int cmd)
1752 {
1753         struct snd_usb_substream *subs = substream->runtime->private_data;
1754
1755         switch (cmd) {
1756         case SNDRV_PCM_TRIGGER_START:
1757                 subs->trigger_tstamp_pending_update = true;
1758                 fallthrough;
1759         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1760                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1761                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1762                 subs->running = 1;
1763                 return 0;
1764         case SNDRV_PCM_TRIGGER_STOP:
1765                 stop_endpoints(subs);
1766                 subs->running = 0;
1767                 return 0;
1768         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1769                 subs->data_endpoint->prepare_data_urb = NULL;
1770                 /* keep retire_data_urb for delay calculation */
1771                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1772                 subs->running = 0;
1773                 return 0;
1774         case SNDRV_PCM_TRIGGER_SUSPEND:
1775                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1776                         stop_endpoints(subs);
1777                         subs->need_setup_fmt = true;
1778                         return 0;
1779                 }
1780                 break;
1781         }
1782
1783         return -EINVAL;
1784 }
1785
1786 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1787                                              int cmd)
1788 {
1789         int err;
1790         struct snd_usb_substream *subs = substream->runtime->private_data;
1791
1792         switch (cmd) {
1793         case SNDRV_PCM_TRIGGER_START:
1794                 err = start_endpoints(subs);
1795                 if (err < 0)
1796                         return err;
1797
1798                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1799                 subs->running = 1;
1800                 return 0;
1801         case SNDRV_PCM_TRIGGER_STOP:
1802                 stop_endpoints(subs);
1803                 subs->data_endpoint->retire_data_urb = NULL;
1804                 subs->running = 0;
1805                 return 0;
1806         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1807                 subs->data_endpoint->retire_data_urb = NULL;
1808                 subs->running = 0;
1809                 return 0;
1810         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1811                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1812                 subs->running = 1;
1813                 return 0;
1814         case SNDRV_PCM_TRIGGER_SUSPEND:
1815                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1816                         stop_endpoints(subs);
1817                         subs->need_setup_fmt = true;
1818                         return 0;
1819                 }
1820                 break;
1821         }
1822
1823         return -EINVAL;
1824 }
1825
1826 static const struct snd_pcm_ops snd_usb_playback_ops = {
1827         .open =         snd_usb_pcm_open,
1828         .close =        snd_usb_pcm_close,
1829         .hw_params =    snd_usb_hw_params,
1830         .hw_free =      snd_usb_hw_free,
1831         .prepare =      snd_usb_pcm_prepare,
1832         .trigger =      snd_usb_substream_playback_trigger,
1833         .sync_stop =    snd_usb_pcm_sync_stop,
1834         .pointer =      snd_usb_pcm_pointer,
1835 };
1836
1837 static const struct snd_pcm_ops snd_usb_capture_ops = {
1838         .open =         snd_usb_pcm_open,
1839         .close =        snd_usb_pcm_close,
1840         .hw_params =    snd_usb_hw_params,
1841         .hw_free =      snd_usb_hw_free,
1842         .prepare =      snd_usb_pcm_prepare,
1843         .trigger =      snd_usb_substream_capture_trigger,
1844         .sync_stop =    snd_usb_pcm_sync_stop,
1845         .pointer =      snd_usb_pcm_pointer,
1846 };
1847
1848 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1849 {
1850         const struct snd_pcm_ops *ops;
1851
1852         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1853                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1854         snd_pcm_set_ops(pcm, stream, ops);
1855 }
1856
1857 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1858 {
1859         struct snd_pcm *pcm = subs->stream->pcm;
1860         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1861         struct device *dev = subs->dev->bus->sysdev;
1862
1863         if (snd_usb_use_vmalloc)
1864                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1865                                            NULL, 0, 0);
1866         else
1867                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1868                                            dev, 64*1024, 512*1024);
1869 }