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         case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
 340                 ep = 0x81;
 341                 ifnum = 3;
 342                 goto add_sync_ep_from_ifnum;
 343         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 344         case USB_ID(0x0763, 0x2081):
 345                 ep = 0x81;
 346                 ifnum = 2;
 347                 goto add_sync_ep_from_ifnum;
 348         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 349         case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
 350                 ep = 0x86;
 351                 ifnum = 2;
 352                 goto add_sync_ep_from_ifnum;
 353         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 354                 ep = 0x81;
 355                 ifnum = 2;
 356                 goto add_sync_ep_from_ifnum;
 357         case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
 358                 ep = 0x82;
 359                 ifnum = 2;
 360                 goto add_sync_ep_from_ifnum;
 361         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 362         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 363                 ep = 0x81;
 364                 ifnum = 1;
 365                 goto add_sync_ep_from_ifnum;
 366         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
 367                 /* MicroBook IIc */
 368                 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
 369                         return 0;
 370
 371                 /* MicroBook II */
 372                 ep = 0x84;
 373                 ifnum = 0;
 374                 goto add_sync_ep_from_ifnum;
 375         case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
 376         case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
 377         case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
 378         case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
 379         case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
 380                 ep = 0x81;
 381                 ifnum = 2;
 382                 goto add_sync_ep_from_ifnum;
 383         case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 384         case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
 385                 ep = 0x82;
 386                 ifnum = 0;
 387                 goto add_sync_ep_from_ifnum;
 388         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 389                 /* BOSS Katana amplifiers do not need quirks */
 390                 return 0;
 391         }
 392
 393         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 394             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 395             altsd->bInterfaceProtocol == 2 &&
 396             altsd->bNumEndpoints == 1 &&
 397             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 398             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 399                                       altsd->bAlternateSetting,
 400                                       &alts, &ep) >= 0) {
 401                 goto add_sync_ep;
 402         }
 403
 404         /* No quirk */
 405         return 0;
 406
 407 add_sync_ep_from_ifnum:
 408         iface = usb_ifnum_to_if(dev, ifnum);
 409
 410         if (!iface || iface->num_altsetting < 2)
 411                 return -EINVAL;
 412
 413         alts = &iface->altsetting[1];
 414
 415 add_sync_ep:
 416         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 417                                                    alts, ep, !subs->direction,
 418                                                    SND_USB_ENDPOINT_TYPE_DATA);
 419         if (!subs->sync_endpoint)
 420                 return -EINVAL;
 421
 422         subs->sync_endpoint->is_implicit_feedback = 1;
 423
 424         subs->data_endpoint->sync_master = subs->sync_endpoint;
 425
 426         return 1;
 427 }
 428
 429 static int set_sync_endpoint(struct snd_usb_substream *subs,
 430                              struct audioformat *fmt,
 431                              struct usb_device *dev,
 432                              struct usb_host_interface *alts,
 433                              struct usb_interface_descriptor *altsd)
 434 {
 435         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 436         unsigned int ep, attr;
 437         bool implicit_fb;
 438         int err;
 439
 440         /* we need a sync pipe in async OUT or adaptive IN mode */
 441         /* check the number of EP, since some devices have broken
 442          * descriptors which fool us.  if it has only one EP,
 443          * assume it as adaptive-out or sync-in.
 444          */
 445         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 446
 447         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 448                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 449
 450                 /*
 451                  * In these modes the notion of sync_endpoint is irrelevant.
 452                  * Reset pointers to avoid using stale data from previously
 453                  * used settings, e.g. when configuration and endpoints were
 454                  * changed
 455                  */
 456
 457                 subs->sync_endpoint = NULL;
 458                 subs->data_endpoint->sync_master = NULL;
 459         }
 460
 461         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 462         if (err < 0)
 463                 return err;
 464
 465         /* endpoint set by quirk */
 466         if (err > 0)
 467                 return 0;
 468
 469         if (altsd->bNumEndpoints < 2)
 470                 return 0;
 471
 472         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 473                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 474             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 475                 return 0;
 476
 477         /*
 478          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 479          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 480          * error fall back to SYNC mode and don't create sync endpoint
 481          */
 482
 483         /* check sync-pipe endpoint */
 484         /* ... and check descriptor size before accessing bSynchAddress
 485            because there is a version of the SB Audigy 2 NX firmware lacking
 486            the audio fields in the endpoint descriptors */
 487         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 488             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 489              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 490                 dev_err(&dev->dev,
 491                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 492                            fmt->iface, fmt->altsetting,
 493                            get_endpoint(alts, 1)->bmAttributes,
 494                            get_endpoint(alts, 1)->bLength,
 495                            get_endpoint(alts, 1)->bSynchAddress);
 496                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 497                         return 0;
 498                 return -EINVAL;
 499         }
 500         ep = get_endpoint(alts, 1)->bEndpointAddress;
 501         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 502             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 503             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 504              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 505                 dev_err(&dev->dev,
 506                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 507                            fmt->iface, fmt->altsetting,
 508                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 509                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 510                         return 0;
 511                 return -EINVAL;
 512         }
 513
 514         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 515                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 516
 517         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 518                                                    alts, ep, !subs->direction,
 519                                                    implicit_fb ?
 520                                                         SND_USB_ENDPOINT_TYPE_DATA :
 521                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 522
 523         if (!subs->sync_endpoint) {
 524                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 525                         return 0;
 526                 return -EINVAL;
 527         }
 528
 529         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 530
 531         subs->data_endpoint->sync_master = subs->sync_endpoint;
 532
 533         return 0;
 534 }
 535
 536 /*
 537  * find a matching format and set up the interface
 538  */
 539 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 540 {
 541         struct usb_device *dev = subs->dev;
 542         struct usb_host_interface *alts;
 543         struct usb_interface_descriptor *altsd;
 544         struct usb_interface *iface;
 545         int err;
 546
 547         iface = usb_ifnum_to_if(dev, fmt->iface);
 548         if (WARN_ON(!iface))
 549                 return -EINVAL;
 550         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 551         if (WARN_ON(!alts))
 552                 return -EINVAL;
 553         altsd = get_iface_desc(alts);
 554
 555         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 556                 return 0;
 557
 558         /* close the old interface */
 559         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 560                 if (!subs->stream->chip->keep_iface) {
 561                         err = usb_set_interface(subs->dev, subs->interface, 0);
 562                         if (err < 0) {
 563                                 dev_err(&dev->dev,
 564                                         "%d:%d: return to setting 0 failed (%d)\n",
 565                                         fmt->iface, fmt->altsetting, err);
 566                                 return -EIO;
 567                         }
 568                 }
 569                 subs->interface = -1;
 570                 subs->altset_idx = 0;
 571         }
 572
 573         if (subs->need_setup_fmt)
 574                 subs->need_setup_fmt = false;
 575
 576         /* set interface */
 577         if (iface->cur_altsetting != alts) {
 578                 err = snd_usb_select_mode_quirk(subs, fmt);
 579                 if (err < 0)
 580                         return -EIO;
 581
 582                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 583                 if (err < 0) {
 584                         dev_err(&dev->dev,
 585                                 "%d:%d: usb_set_interface failed (%d)\n",
 586                                 fmt->iface, fmt->altsetting, err);
 587                         return -EIO;
 588                 }
 589                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 590                         fmt->iface, fmt->altsetting);
 591                 snd_usb_set_interface_quirk(dev);
 592         }
 593
 594         subs->interface = fmt->iface;
 595         subs->altset_idx = fmt->altset_idx;
 596         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 597                                                    alts, fmt->endpoint, subs->direction,
 598                                                    SND_USB_ENDPOINT_TYPE_DATA);
 599
 600         if (!subs->data_endpoint)
 601                 return -EINVAL;
 602
 603         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 604         if (err < 0)
 605                 return err;
 606
 607         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 608         if (err < 0)
 609                 return err;
 610
 611         subs->cur_audiofmt = fmt;
 612
 613         snd_usb_set_format_quirk(subs, fmt);
 614
 615         return 0;
 616 }
 617
 618 /*
 619  * Return the score of matching two audioformats.
 620  * Veto the audioformat if:
 621  * - It has no channels for some reason.
 622  * - Requested PCM format is not supported.
 623  * - Requested sample rate is not supported.
 624  */
 625 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 626                                        struct audioformat *fp,
 627                                        struct audioformat *match, int rate,
 628                                        snd_pcm_format_t pcm_format)
 629 {
 630         int i;
 631         int score = 0;
 632
 633         if (fp->channels < 1) {
 634                 dev_dbg(&subs->dev->dev,
 635                         "%s: (fmt @%p) no channels\n", __func__, fp);
 636                 return 0;
 637         }
 638
 639         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 640                 dev_dbg(&subs->dev->dev,
 641                         "%s: (fmt @%p) no match for format %d\n", __func__,
 642                         fp, pcm_format);
 643                 return 0;
 644         }
 645
 646         for (i = 0; i < fp->nr_rates; i++) {
 647                 if (fp->rate_table[i] == rate) {
 648                         score++;
 649                         break;
 650                 }
 651         }
 652         if (!score) {
 653                 dev_dbg(&subs->dev->dev,
 654                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 655                         fp, rate);
 656                 return 0;
 657         }
 658
 659         if (fp->channels == match->channels)
 660                 score++;
 661
 662         dev_dbg(&subs->dev->dev,
 663                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 664
 665         return score;
 666 }
 667
 668 /*
 669  * Configure the sync ep using the rate and pcm format of the data ep.
 670  */
 671 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 672 {
 673         int ret;
 674         struct audioformat *fp;
 675         struct audioformat *sync_fp = NULL;
 676         int cur_score = 0;
 677         int sync_period_bytes = subs->period_bytes;
 678         struct snd_usb_substream *sync_subs =
 679                 &subs->stream->substream[subs->direction ^ 1];
 680
 681         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 682             !subs->stream)
 683                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 684                                                    subs->pcm_format,
 685                                                    subs->channels,
 686                                                    subs->period_bytes,
 687                                                    0, 0,
 688                                                    subs->cur_rate,
 689                                                    subs->cur_audiofmt,
 690                                                    NULL);
 691
 692         /* Try to find the best matching audioformat. */
 693         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 694                 int score = match_endpoint_audioformats(subs,
 695                                                         fp, subs->cur_audiofmt,
 696                         subs->cur_rate, subs->pcm_format);
 697
 698                 if (score > cur_score) {
 699                         sync_fp = fp;
 700                         cur_score = score;
 701                 }
 702         }
 703
 704         if (unlikely(sync_fp == NULL)) {
 705                 dev_err(&subs->dev->dev,
 706                         "%s: no valid audioformat for sync ep %x found\n",
 707                         __func__, sync_subs->ep_num);
 708                 return -EINVAL;
 709         }
 710
 711         /*
 712          * Recalculate the period bytes if channel number differ between
 713          * data and sync ep audioformat.
 714          */
 715         if (sync_fp->channels != subs->channels) {
 716                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 717                         sync_fp->channels;
 718                 dev_dbg(&subs->dev->dev,
 719                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 720                         __func__, subs->period_bytes, sync_period_bytes);
 721         }
 722
 723         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 724                                           subs->pcm_format,
 725                                           sync_fp->channels,
 726                                           sync_period_bytes,
 727                                           0, 0,
 728                                           subs->cur_rate,
 729                                           sync_fp,
 730                                           NULL);
 731
 732         return ret;
 733 }
 734
 735 /*
 736  * configure endpoint params
 737  *
 738  * called  during initial setup and upon resume
 739  */
 740 static int configure_endpoint(struct snd_usb_substream *subs)
 741 {
 742         int ret;
 743
 744         /* format changed */
 745         stop_endpoints(subs);
 746         sync_pending_stops(subs);
 747         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 748                                           subs->pcm_format,
 749                                           subs->channels,
 750                                           subs->period_bytes,
 751                                           subs->period_frames,
 752                                           subs->buffer_periods,
 753                                           subs->cur_rate,
 754                                           subs->cur_audiofmt,
 755                                           subs->sync_endpoint);
 756         if (ret < 0)
 757                 return ret;
 758
 759         if (subs->sync_endpoint)
 760                 ret = configure_sync_endpoint(subs);
 761
 762         return ret;
 763 }
 764
 765 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 766 {
 767         int ret;
 768
 769         if (!subs->str_pd)
 770                 return 0;
 771
 772         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 773         if (ret < 0) {
 774                 dev_err(&subs->dev->dev,
 775                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 776                         subs->str_pd->pd_id, state, ret);
 777                 return ret;
 778         }
 779
 780         return 0;
 781 }
 782
 783 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 784 {
 785         int ret;
 786
 787         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 788         if (ret < 0)
 789                 return ret;
 790
 791         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 792         if (ret < 0)
 793                 return ret;
 794
 795         return 0;
 796 }
 797
 798 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 799 {
 800         int ret;
 801
 802         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 803         if (ret < 0)
 804                 return ret;
 805
 806         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 807         if (ret < 0)
 808                 return ret;
 809
 810         return 0;
 811 }
 812
 813 /*
 814  * hw_params callback
 815  *
 816  * allocate a buffer and set the given audio format.
 817  *
 818  * so far we use a physically linear buffer although packetize transfer
 819  * doesn't need a continuous area.
 820  * if sg buffer is supported on the later version of alsa, we'll follow
 821  * that.
 822  */
 823 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 824                              struct snd_pcm_hw_params *hw_params)
 825 {
 826         struct snd_usb_substream *subs = substream->runtime->private_data;
 827         struct audioformat *fmt;
 828         int ret;
 829
 830         ret = snd_media_start_pipeline(subs);
 831         if (ret)
 832                 return ret;
 833
 834         subs->pcm_format = params_format(hw_params);
 835         subs->period_bytes = params_period_bytes(hw_params);
 836         subs->period_frames = params_period_size(hw_params);
 837         subs->buffer_periods = params_periods(hw_params);
 838         subs->channels = params_channels(hw_params);
 839         subs->cur_rate = params_rate(hw_params);
 840
 841         fmt = find_format(subs);
 842         if (!fmt) {
 843                 dev_dbg(&subs->dev->dev,
 844                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 845                            subs->pcm_format, subs->cur_rate, subs->channels);
 846                 ret = -EINVAL;
 847                 goto stop_pipeline;
 848         }
 849
 850         ret = snd_usb_lock_shutdown(subs->stream->chip);
 851         if (ret < 0)
 852                 goto stop_pipeline;
 853
 854         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 855         if (ret < 0)
 856                 goto unlock;
 857
 858         ret = set_format(subs, fmt);
 859         if (ret < 0)
 860                 goto unlock;
 861
 862         subs->interface = fmt->iface;
 863         subs->altset_idx = fmt->altset_idx;
 864         subs->need_setup_ep = true;
 865
 866  unlock:
 867         snd_usb_unlock_shutdown(subs->stream->chip);
 868         if (ret < 0)
 869                 goto stop_pipeline;
 870         return ret;
 871
 872  stop_pipeline:
 873         snd_media_stop_pipeline(subs);
 874         return ret;
 875 }
 876
 877 /*
 878  * hw_free callback
 879  *
 880  * reset the audio format and release the buffer
 881  */
 882 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 883 {
 884         struct snd_usb_substream *subs = substream->runtime->private_data;
 885
 886         snd_media_stop_pipeline(subs);
 887         subs->cur_audiofmt = NULL;
 888         subs->cur_rate = 0;
 889         subs->period_bytes = 0;
 890         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 891                 stop_endpoints(subs);
 892                 sync_pending_stops(subs);
 893                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 894                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 895                 snd_usb_unlock_shutdown(subs->stream->chip);
 896         }
 897
 898         return 0;
 899 }
 900
 901 /*
 902  * prepare callback
 903  *
 904  * only a few subtle things...
 905  */
 906 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 907 {
 908         struct snd_pcm_runtime *runtime = substream->runtime;
 909         struct snd_usb_substream *subs = runtime->private_data;
 910         struct usb_host_interface *alts;
 911         struct usb_interface *iface;
 912         int ret;
 913
 914         if (! subs->cur_audiofmt) {
 915                 dev_err(&subs->dev->dev, "no format is specified!\n");
 916                 return -ENXIO;
 917         }
 918
 919         ret = snd_usb_lock_shutdown(subs->stream->chip);
 920         if (ret < 0)
 921                 return ret;
 922         if (snd_BUG_ON(!subs->data_endpoint)) {
 923                 ret = -EIO;
 924                 goto unlock;
 925         }
 926
 927         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 928         if (ret < 0)
 929                 goto unlock;
 930
 931         ret = set_format(subs, subs->cur_audiofmt);
 932         if (ret < 0)
 933                 goto unlock;
 934
 935         if (subs->need_setup_ep) {
 936
 937                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 938                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 939                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 940                                                subs->cur_audiofmt->iface,
 941                                                alts,
 942                                                subs->cur_audiofmt,
 943                                                subs->cur_rate);
 944                 if (ret < 0)
 945                         goto unlock;
 946
 947                 ret = configure_endpoint(subs);
 948                 if (ret < 0)
 949                         goto unlock;
 950                 subs->need_setup_ep = false;
 951         }
 952
 953         /* some unit conversions in runtime */
 954         subs->data_endpoint->maxframesize =
 955                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 956         subs->data_endpoint->curframesize =
 957                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 958
 959         /* reset the pointer */
 960         subs->hwptr_done = 0;
 961         subs->transfer_done = 0;
 962         subs->last_delay = 0;
 963         subs->last_frame_number = 0;
 964         runtime->delay = 0;
 965
 966         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 967          * updates for all URBs would happen at the same time when starting */
 968         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 969                 ret = start_endpoints(subs);
 970
 971  unlock:
 972         snd_usb_unlock_shutdown(subs->stream->chip);
 973         return ret;
 974 }
 975
 976 static const struct snd_pcm_hardware snd_usb_hardware =
 977 {
 978         .info =                 SNDRV_PCM_INFO_MMAP |
 979                                 SNDRV_PCM_INFO_MMAP_VALID |
 980                                 SNDRV_PCM_INFO_BATCH |
 981                                 SNDRV_PCM_INFO_INTERLEAVED |
 982                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 983                                 SNDRV_PCM_INFO_PAUSE,
 984         .buffer_bytes_max =     1024 * 1024,
 985         .period_bytes_min =     64,
 986         .period_bytes_max =     512 * 1024,
 987         .periods_min =          2,
 988         .periods_max =          1024,
 989 };
 990
 991 static int hw_check_valid_format(struct snd_usb_substream *subs,
 992                                  struct snd_pcm_hw_params *params,
 993                                  struct audioformat *fp)
 994 {
 995         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 996         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 997         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 998         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 999         struct snd_mask check_fmts;
1000         unsigned int ptime;
1001
1002         /* check the format */
1003         snd_mask_none(&check_fmts);
1004         check_fmts.bits[0] = (u32)fp->formats;
1005         check_fmts.bits[1] = (u32)(fp->formats >> 32);
1006         snd_mask_intersect(&check_fmts, fmts);
1007         if (snd_mask_empty(&check_fmts)) {
1008                 hwc_debug("   > check: no supported format %d\n", fp->format);
1009                 return 0;
1010         }
1011         /* check the channels */
1012         if (fp->channels < ct->min || fp->channels > ct->max) {
1013                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1014                 return 0;
1015         }
1016         /* check the rate is within the range */
1017         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1018                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1019                 return 0;
1020         }
1021         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1022                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1023                 return 0;
1024         }
1025         /* check whether the period time is >= the data packet interval */
1026         if (subs->speed != USB_SPEED_FULL) {
1027                 ptime = 125 * (1 << fp->datainterval);
1028                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1029                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1030                         return 0;
1031                 }
1032         }
1033         return 1;
1034 }
1035
1036 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1037                         struct snd_pcm_hw_rule *rule)
1038 {
1039         struct snd_usb_substream *subs = rule->private;
1040         struct audioformat *fp;
1041         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1042         unsigned int rmin, rmax;
1043         int changed;
1044
1045         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1046         changed = 0;
1047         rmin = rmax = 0;
1048         list_for_each_entry(fp, &subs->fmt_list, list) {
1049                 if (!hw_check_valid_format(subs, params, fp))
1050                         continue;
1051                 if (changed++) {
1052                         if (rmin > fp->rate_min)
1053                                 rmin = fp->rate_min;
1054                         if (rmax < fp->rate_max)
1055                                 rmax = fp->rate_max;
1056                 } else {
1057                         rmin = fp->rate_min;
1058                         rmax = fp->rate_max;
1059                 }
1060         }
1061
1062         if (!changed) {
1063                 hwc_debug("  --> get empty\n");
1064                 it->empty = 1;
1065                 return -EINVAL;
1066         }
1067
1068         changed = 0;
1069         if (it->min < rmin) {
1070                 it->min = rmin;
1071                 it->openmin = 0;
1072                 changed = 1;
1073         }
1074         if (it->max > rmax) {
1075                 it->max = rmax;
1076                 it->openmax = 0;
1077                 changed = 1;
1078         }
1079         if (snd_interval_checkempty(it)) {
1080                 it->empty = 1;
1081                 return -EINVAL;
1082         }
1083         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1084         return changed;
1085 }
1086
1087
1088 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1089                             struct snd_pcm_hw_rule *rule)
1090 {
1091         struct snd_usb_substream *subs = rule->private;
1092         struct audioformat *fp;
1093         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1094         unsigned int rmin, rmax;
1095         int changed;
1096
1097         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1098         changed = 0;
1099         rmin = rmax = 0;
1100         list_for_each_entry(fp, &subs->fmt_list, list) {
1101                 if (!hw_check_valid_format(subs, params, fp))
1102                         continue;
1103                 if (changed++) {
1104                         if (rmin > fp->channels)
1105                                 rmin = fp->channels;
1106                         if (rmax < fp->channels)
1107                                 rmax = fp->channels;
1108                 } else {
1109                         rmin = fp->channels;
1110                         rmax = fp->channels;
1111                 }
1112         }
1113
1114         if (!changed) {
1115                 hwc_debug("  --> get empty\n");
1116                 it->empty = 1;
1117                 return -EINVAL;
1118         }
1119
1120         changed = 0;
1121         if (it->min < rmin) {
1122                 it->min = rmin;
1123                 it->openmin = 0;
1124                 changed = 1;
1125         }
1126         if (it->max > rmax) {
1127                 it->max = rmax;
1128                 it->openmax = 0;
1129                 changed = 1;
1130         }
1131         if (snd_interval_checkempty(it)) {
1132                 it->empty = 1;
1133                 return -EINVAL;
1134         }
1135         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1136         return changed;
1137 }
1138
1139 static int hw_rule_format(struct snd_pcm_hw_params *params,
1140                           struct snd_pcm_hw_rule *rule)
1141 {
1142         struct snd_usb_substream *subs = rule->private;
1143         struct audioformat *fp;
1144         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1145         u64 fbits;
1146         u32 oldbits[2];
1147         int changed;
1148
1149         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1150         fbits = 0;
1151         list_for_each_entry(fp, &subs->fmt_list, list) {
1152                 if (!hw_check_valid_format(subs, params, fp))
1153                         continue;
1154                 fbits |= fp->formats;
1155         }
1156
1157         oldbits[0] = fmt->bits[0];
1158         oldbits[1] = fmt->bits[1];
1159         fmt->bits[0] &= (u32)fbits;
1160         fmt->bits[1] &= (u32)(fbits >> 32);
1161         if (!fmt->bits[0] && !fmt->bits[1]) {
1162                 hwc_debug("  --> get empty\n");
1163                 return -EINVAL;
1164         }
1165         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1166         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1167         return changed;
1168 }
1169
1170 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1171                                struct snd_pcm_hw_rule *rule)
1172 {
1173         struct snd_usb_substream *subs = rule->private;
1174         struct audioformat *fp;
1175         struct snd_interval *it;
1176         unsigned char min_datainterval;
1177         unsigned int pmin;
1178         int changed;
1179
1180         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1181         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1182         min_datainterval = 0xff;
1183         list_for_each_entry(fp, &subs->fmt_list, list) {
1184                 if (!hw_check_valid_format(subs, params, fp))
1185                         continue;
1186                 min_datainterval = min(min_datainterval, fp->datainterval);
1187         }
1188         if (min_datainterval == 0xff) {
1189                 hwc_debug("  --> get empty\n");
1190                 it->empty = 1;
1191                 return -EINVAL;
1192         }
1193         pmin = 125 * (1 << min_datainterval);
1194         changed = 0;
1195         if (it->min < pmin) {
1196                 it->min = pmin;
1197                 it->openmin = 0;
1198                 changed = 1;
1199         }
1200         if (snd_interval_checkempty(it)) {
1201                 it->empty = 1;
1202                 return -EINVAL;
1203         }
1204         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1205         return changed;
1206 }
1207
1208 /*
1209  *  If the device supports unusual bit rates, does the request meet these?
1210  */
1211 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1212                                   struct snd_usb_substream *subs)
1213 {
1214         struct audioformat *fp;
1215         int *rate_list;
1216         int count = 0, needs_knot = 0;
1217         int err;
1218
1219         kfree(subs->rate_list.list);
1220         subs->rate_list.list = NULL;
1221
1222         list_for_each_entry(fp, &subs->fmt_list, list) {
1223                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1224                         return 0;
1225                 count += fp->nr_rates;
1226                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1227                         needs_knot = 1;
1228         }
1229         if (!needs_knot)
1230                 return 0;
1231
1232         subs->rate_list.list = rate_list =
1233                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1234         if (!subs->rate_list.list)
1235                 return -ENOMEM;
1236         subs->rate_list.count = count;
1237         subs->rate_list.mask = 0;
1238         count = 0;
1239         list_for_each_entry(fp, &subs->fmt_list, list) {
1240                 int i;
1241                 for (i = 0; i < fp->nr_rates; i++)
1242                         rate_list[count++] = fp->rate_table[i];
1243         }
1244         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1245                                          &subs->rate_list);
1246         if (err < 0)
1247                 return err;
1248
1249         return 0;
1250 }
1251
1252
1253 /*
1254  * set up the runtime hardware information.
1255  */
1256
1257 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1258 {
1259         struct audioformat *fp;
1260         unsigned int pt, ptmin;
1261         int param_period_time_if_needed;
1262         int err;
1263
1264         runtime->hw.formats = subs->formats;
1265
1266         runtime->hw.rate_min = 0x7fffffff;
1267         runtime->hw.rate_max = 0;
1268         runtime->hw.channels_min = 256;
1269         runtime->hw.channels_max = 0;
1270         runtime->hw.rates = 0;
1271         ptmin = UINT_MAX;
1272         /* check min/max rates and channels */
1273         list_for_each_entry(fp, &subs->fmt_list, list) {
1274                 runtime->hw.rates |= fp->rates;
1275                 if (runtime->hw.rate_min > fp->rate_min)
1276                         runtime->hw.rate_min = fp->rate_min;
1277                 if (runtime->hw.rate_max < fp->rate_max)
1278                         runtime->hw.rate_max = fp->rate_max;
1279                 if (runtime->hw.channels_min > fp->channels)
1280                         runtime->hw.channels_min = fp->channels;
1281                 if (runtime->hw.channels_max < fp->channels)
1282                         runtime->hw.channels_max = fp->channels;
1283                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1284                         /* FIXME: there might be more than one audio formats... */
1285                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1286                                 fp->frame_size;
1287                 }
1288                 pt = 125 * (1 << fp->datainterval);
1289                 ptmin = min(ptmin, pt);
1290         }
1291
1292         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1293         if (subs->speed == USB_SPEED_FULL)
1294                 /* full speed devices have fixed data packet interval */
1295                 ptmin = 1000;
1296         if (ptmin == 1000)
1297                 /* if period time doesn't go below 1 ms, no rules needed */
1298                 param_period_time_if_needed = -1;
1299
1300         err = snd_pcm_hw_constraint_minmax(runtime,
1301                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1302                                            ptmin, UINT_MAX);
1303         if (err < 0)
1304                 return err;
1305
1306         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1307                                   hw_rule_rate, subs,
1308                                   SNDRV_PCM_HW_PARAM_FORMAT,
1309                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1310                                   param_period_time_if_needed,
1311                                   -1);
1312         if (err < 0)
1313                 return err;
1314         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1315                                   hw_rule_channels, subs,
1316                                   SNDRV_PCM_HW_PARAM_FORMAT,
1317                                   SNDRV_PCM_HW_PARAM_RATE,
1318                                   param_period_time_if_needed,
1319                                   -1);
1320         if (err < 0)
1321                 return err;
1322         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1323                                   hw_rule_format, subs,
1324                                   SNDRV_PCM_HW_PARAM_RATE,
1325                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1326                                   param_period_time_if_needed,
1327                                   -1);
1328         if (err < 0)
1329                 return err;
1330         if (param_period_time_if_needed >= 0) {
1331                 err = snd_pcm_hw_rule_add(runtime, 0,
1332                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1333                                           hw_rule_period_time, subs,
1334                                           SNDRV_PCM_HW_PARAM_FORMAT,
1335                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1336                                           SNDRV_PCM_HW_PARAM_RATE,
1337                                           -1);
1338                 if (err < 0)
1339                         return err;
1340         }
1341         err = snd_usb_pcm_check_knot(runtime, subs);
1342         if (err < 0)
1343                 return err;
1344
1345         return snd_usb_autoresume(subs->stream->chip);
1346 }
1347
1348 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1349 {
1350         int direction = substream->stream;
1351         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1352         struct snd_pcm_runtime *runtime = substream->runtime;
1353         struct snd_usb_substream *subs = &as->substream[direction];
1354         int ret;
1355
1356         subs->interface = -1;
1357         subs->altset_idx = 0;
1358         runtime->hw = snd_usb_hardware;
1359         runtime->private_data = subs;
1360         subs->pcm_substream = substream;
1361         /* runtime PM is also done there */
1362
1363         /* initialize DSD/DOP context */
1364         subs->dsd_dop.byte_idx = 0;
1365         subs->dsd_dop.channel = 0;
1366         subs->dsd_dop.marker = 1;
1367
1368         ret = setup_hw_info(runtime, subs);
1369         if (ret == 0) {
1370                 ret = snd_media_stream_init(subs, as->pcm, direction);
1371                 if (ret)
1372                         snd_usb_autosuspend(subs->stream->chip);
1373         }
1374         return ret;
1375 }
1376
1377 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1378 {
1379         int direction = substream->stream;
1380         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1381         struct snd_usb_substream *subs = &as->substream[direction];
1382         int ret;
1383
1384         snd_media_stop_pipeline(subs);
1385
1386         if (!as->chip->keep_iface &&
1387             subs->interface >= 0 &&
1388             !snd_usb_lock_shutdown(subs->stream->chip)) {
1389                 usb_set_interface(subs->dev, subs->interface, 0);
1390                 subs->interface = -1;
1391                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1392                 snd_usb_unlock_shutdown(subs->stream->chip);
1393                 if (ret < 0)
1394                         return ret;
1395         }
1396
1397         subs->pcm_substream = NULL;
1398         snd_usb_autosuspend(subs->stream->chip);
1399
1400         return 0;
1401 }
1402
1403 /* Since a URB can handle only a single linear buffer, we must use double
1404  * buffering when the data to be transferred overflows the buffer boundary.
1405  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1406  * for all URBs.
1407  */
1408 static void retire_capture_urb(struct snd_usb_substream *subs,
1409                                struct urb *urb)
1410 {
1411         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1412         unsigned int stride, frames, bytes, oldptr;
1413         int i, period_elapsed = 0;
1414         unsigned long flags;
1415         unsigned char *cp;
1416         int current_frame_number;
1417
1418         /* read frame number here, update pointer in critical section */
1419         current_frame_number = usb_get_current_frame_number(subs->dev);
1420
1421         stride = runtime->frame_bits >> 3;
1422
1423         for (i = 0; i < urb->number_of_packets; i++) {
1424                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1425                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1426                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1427                                 i, urb->iso_frame_desc[i].status);
1428                         // continue;
1429                 }
1430                 bytes = urb->iso_frame_desc[i].actual_length;
1431                 if (subs->stream_offset_adj > 0) {
1432                         unsigned int adj = min(subs->stream_offset_adj, bytes);
1433                         cp += adj;
1434                         bytes -= adj;
1435                         subs->stream_offset_adj -= adj;
1436                 }
1437                 frames = bytes / stride;
1438                 if (!subs->txfr_quirk)
1439                         bytes = frames * stride;
1440                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1441                         int oldbytes = bytes;
1442                         bytes = frames * stride;
1443                         dev_warn_ratelimited(&subs->dev->dev,
1444                                  "Corrected urb data len. %d->%d\n",
1445                                                         oldbytes, bytes);
1446                 }
1447                 /* update the current pointer */
1448                 spin_lock_irqsave(&subs->lock, flags);
1449                 oldptr = subs->hwptr_done;
1450                 subs->hwptr_done += bytes;
1451                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1452                         subs->hwptr_done -= runtime->buffer_size * stride;
1453                 frames = (bytes + (oldptr % stride)) / stride;
1454                 subs->transfer_done += frames;
1455                 if (subs->transfer_done >= runtime->period_size) {
1456                         subs->transfer_done -= runtime->period_size;
1457                         period_elapsed = 1;
1458                 }
1459                 /* capture delay is by construction limited to one URB,
1460                  * reset delays here
1461                  */
1462                 runtime->delay = subs->last_delay = 0;
1463
1464                 /* realign last_frame_number */
1465                 subs->last_frame_number = current_frame_number;
1466                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1467
1468                 spin_unlock_irqrestore(&subs->lock, flags);
1469                 /* copy a data chunk */
1470                 if (oldptr + bytes > runtime->buffer_size * stride) {
1471                         unsigned int bytes1 =
1472                                         runtime->buffer_size * stride - oldptr;
1473                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1474                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1475                 } else {
1476                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1477                 }
1478         }
1479
1480         if (period_elapsed)
1481                 snd_pcm_period_elapsed(subs->pcm_substream);
1482 }
1483
1484 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1485                                              struct urb *urb, unsigned int bytes)
1486 {
1487         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1488         unsigned int stride = runtime->frame_bits >> 3;
1489         unsigned int dst_idx = 0;
1490         unsigned int src_idx = subs->hwptr_done;
1491         unsigned int wrap = runtime->buffer_size * stride;
1492         u8 *dst = urb->transfer_buffer;
1493         u8 *src = runtime->dma_area;
1494         u8 marker[] = { 0x05, 0xfa };
1495
1496         /*
1497          * The DSP DOP format defines a way to transport DSD samples over
1498          * normal PCM data endpoints. It requires stuffing of marker bytes
1499          * (0x05 and 0xfa, alternating per sample frame), and then expects
1500          * 2 additional bytes of actual payload. The whole frame is stored
1501          * LSB.
1502          *
1503          * Hence, for a stereo transport, the buffer layout looks like this,
1504          * where L refers to left channel samples and R to right.
1505          *
1506          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1507          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1508          *   .....
1509          *
1510          */
1511
1512         while (bytes--) {
1513                 if (++subs->dsd_dop.byte_idx == 3) {
1514                         /* frame boundary? */
1515                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1516                         src_idx += 2;
1517                         subs->dsd_dop.byte_idx = 0;
1518
1519                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1520                                 /* alternate the marker */
1521                                 subs->dsd_dop.marker++;
1522                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1523                                 subs->dsd_dop.channel = 0;
1524                         }
1525                 } else {
1526                         /* stuff the DSD payload */
1527                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1528
1529                         if (subs->cur_audiofmt->dsd_bitrev)
1530                                 dst[dst_idx++] = bitrev8(src[idx]);
1531                         else
1532                                 dst[dst_idx++] = src[idx];
1533
1534                         subs->hwptr_done++;
1535                 }
1536         }
1537         if (subs->hwptr_done >= runtime->buffer_size * stride)
1538                 subs->hwptr_done -= runtime->buffer_size * stride;
1539 }
1540
1541 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1542                         int offset, int stride, unsigned int bytes)
1543 {
1544         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1545
1546         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1547                 /* err, the transferred area goes over buffer boundary. */
1548                 unsigned int bytes1 =
1549                         runtime->buffer_size * stride - subs->hwptr_done;
1550                 memcpy(urb->transfer_buffer + offset,
1551                        runtime->dma_area + subs->hwptr_done, bytes1);
1552                 memcpy(urb->transfer_buffer + offset + bytes1,
1553                        runtime->dma_area, bytes - bytes1);
1554         } else {
1555                 memcpy(urb->transfer_buffer + offset,
1556                        runtime->dma_area + subs->hwptr_done, bytes);
1557         }
1558         subs->hwptr_done += bytes;
1559         if (subs->hwptr_done >= runtime->buffer_size * stride)
1560                 subs->hwptr_done -= runtime->buffer_size * stride;
1561 }
1562
1563 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1564                                       struct urb *urb, int stride,
1565                                       unsigned int bytes)
1566 {
1567         __le32 packet_length;
1568         int i;
1569
1570         /* Put __le32 length descriptor at start of each packet. */
1571         for (i = 0; i < urb->number_of_packets; i++) {
1572                 unsigned int length = urb->iso_frame_desc[i].length;
1573                 unsigned int offset = urb->iso_frame_desc[i].offset;
1574
1575                 packet_length = cpu_to_le32(length);
1576                 offset += i * sizeof(packet_length);
1577                 urb->iso_frame_desc[i].offset = offset;
1578                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1579                 memcpy(urb->transfer_buffer + offset,
1580                        &packet_length, sizeof(packet_length));
1581                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1582                             stride, length);
1583         }
1584         /* Adjust transfer size accordingly. */
1585         bytes += urb->number_of_packets * sizeof(packet_length);
1586         return bytes;
1587 }
1588
1589 static void prepare_playback_urb(struct snd_usb_substream *subs,
1590                                  struct urb *urb)
1591 {
1592         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1593         struct snd_usb_endpoint *ep = subs->data_endpoint;
1594         struct snd_urb_ctx *ctx = urb->context;
1595         unsigned int counts, frames, bytes;
1596         int i, stride, period_elapsed = 0;
1597         unsigned long flags;
1598
1599         stride = runtime->frame_bits >> 3;
1600
1601         frames = 0;
1602         urb->number_of_packets = 0;
1603         spin_lock_irqsave(&subs->lock, flags);
1604         subs->frame_limit += ep->max_urb_frames;
1605         for (i = 0; i < ctx->packets; i++) {
1606                 if (ctx->packet_size[i])
1607                         counts = ctx->packet_size[i];
1608                 else if (ep->sync_master)
1609                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1610                 else
1611                         counts = snd_usb_endpoint_next_packet_size(ep);
1612
1613                 /* set up descriptor */
1614                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1615                 urb->iso_frame_desc[i].length = counts * ep->stride;
1616                 frames += counts;
1617                 urb->number_of_packets++;
1618                 subs->transfer_done += counts;
1619                 if (subs->transfer_done >= runtime->period_size) {
1620                         subs->transfer_done -= runtime->period_size;
1621                         subs->frame_limit = 0;
1622                         period_elapsed = 1;
1623                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1624                                 if (subs->transfer_done > 0) {
1625                                         /* FIXME: fill-max mode is not
1626                                          * supported yet */
1627                                         frames -= subs->transfer_done;
1628                                         counts -= subs->transfer_done;
1629                                         urb->iso_frame_desc[i].length =
1630                                                 counts * ep->stride;
1631                                         subs->transfer_done = 0;
1632                                 }
1633                                 i++;
1634                                 if (i < ctx->packets) {
1635                                         /* add a transfer delimiter */
1636                                         urb->iso_frame_desc[i].offset =
1637                                                 frames * ep->stride;
1638                                         urb->iso_frame_desc[i].length = 0;
1639                                         urb->number_of_packets++;
1640                                 }
1641                                 break;
1642                         }
1643                 }
1644                 /* finish at the period boundary or after enough frames */
1645                 if ((period_elapsed ||
1646                                 subs->transfer_done >= subs->frame_limit) &&
1647                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1648                         break;
1649         }
1650         bytes = frames * ep->stride;
1651
1652         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1653                      subs->cur_audiofmt->dsd_dop)) {
1654                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1655         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1656                            subs->cur_audiofmt->dsd_bitrev)) {
1657                 /* bit-reverse the bytes */
1658                 u8 *buf = urb->transfer_buffer;
1659                 for (i = 0; i < bytes; i++) {
1660                         int idx = (subs->hwptr_done + i)
1661                                 % (runtime->buffer_size * stride);
1662                         buf[i] = bitrev8(runtime->dma_area[idx]);
1663                 }
1664
1665                 subs->hwptr_done += bytes;
1666                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1667                         subs->hwptr_done -= runtime->buffer_size * stride;
1668         } else {
1669                 /* usual PCM */
1670                 if (!subs->tx_length_quirk)
1671                         copy_to_urb(subs, urb, 0, stride, bytes);
1672                 else
1673                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1674                         /* bytes is now amount of outgoing data */
1675         }
1676
1677         /* update delay with exact number of samples queued */
1678         runtime->delay = subs->last_delay;
1679         runtime->delay += frames;
1680         subs->last_delay = runtime->delay;
1681
1682         /* realign last_frame_number */
1683         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1684         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1685
1686         if (subs->trigger_tstamp_pending_update) {
1687                 /* this is the first actual URB submitted,
1688                  * update trigger timestamp to reflect actual start time
1689                  */
1690                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1691                 subs->trigger_tstamp_pending_update = false;
1692         }
1693
1694         spin_unlock_irqrestore(&subs->lock, flags);
1695         urb->transfer_buffer_length = bytes;
1696         if (period_elapsed)
1697                 snd_pcm_period_elapsed(subs->pcm_substream);
1698 }
1699
1700 /*
1701  * process after playback data complete
1702  * - decrease the delay count again
1703  */
1704 static void retire_playback_urb(struct snd_usb_substream *subs,
1705                                struct urb *urb)
1706 {
1707         unsigned long flags;
1708         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1709         struct snd_usb_endpoint *ep = subs->data_endpoint;
1710         int processed = urb->transfer_buffer_length / ep->stride;
1711         int est_delay;
1712
1713         /* ignore the delay accounting when processed=0 is given, i.e.
1714          * silent payloads are processed before handling the actual data
1715          */
1716         if (!processed)
1717                 return;
1718
1719         spin_lock_irqsave(&subs->lock, flags);
1720         if (!subs->last_delay)
1721                 goto out; /* short path */
1722
1723         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1724         /* update delay with exact number of samples played */
1725         if (processed > subs->last_delay)
1726                 subs->last_delay = 0;
1727         else
1728                 subs->last_delay -= processed;
1729         runtime->delay = subs->last_delay;
1730
1731         /*
1732          * Report when delay estimate is off by more than 2ms.
1733          * The error should be lower than 2ms since the estimate relies
1734          * on two reads of a counter updated every ms.
1735          */
1736         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1737                 dev_dbg_ratelimited(&subs->dev->dev,
1738                         "delay: estimated %d, actual %d\n",
1739                         est_delay, subs->last_delay);
1740
1741         if (!subs->running) {
1742                 /* update last_frame_number for delay counting here since
1743                  * prepare_playback_urb won't be called during pause
1744                  */
1745                 subs->last_frame_number =
1746                         usb_get_current_frame_number(subs->dev) & 0xff;
1747         }
1748
1749  out:
1750         spin_unlock_irqrestore(&subs->lock, flags);
1751 }
1752
1753 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1754                                               int cmd)
1755 {
1756         struct snd_usb_substream *subs = substream->runtime->private_data;
1757
1758         switch (cmd) {
1759         case SNDRV_PCM_TRIGGER_START:
1760                 subs->trigger_tstamp_pending_update = true;
1761                 fallthrough;
1762         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1763                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1764                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1765                 subs->running = 1;
1766                 return 0;
1767         case SNDRV_PCM_TRIGGER_STOP:
1768                 stop_endpoints(subs);
1769                 subs->running = 0;
1770                 return 0;
1771         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1772                 subs->data_endpoint->prepare_data_urb = NULL;
1773                 /* keep retire_data_urb for delay calculation */
1774                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1775                 subs->running = 0;
1776                 return 0;
1777         case SNDRV_PCM_TRIGGER_SUSPEND:
1778                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1779                         stop_endpoints(subs);
1780                         subs->need_setup_fmt = true;
1781                         return 0;
1782                 }
1783                 break;
1784         }
1785
1786         return -EINVAL;
1787 }
1788
1789 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1790                                              int cmd)
1791 {
1792         int err;
1793         struct snd_usb_substream *subs = substream->runtime->private_data;
1794
1795         switch (cmd) {
1796         case SNDRV_PCM_TRIGGER_START:
1797                 err = start_endpoints(subs);
1798                 if (err < 0)
1799                         return err;
1800
1801                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1802                 subs->running = 1;
1803                 return 0;
1804         case SNDRV_PCM_TRIGGER_STOP:
1805                 stop_endpoints(subs);
1806                 subs->data_endpoint->retire_data_urb = NULL;
1807                 subs->running = 0;
1808                 return 0;
1809         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1810                 subs->data_endpoint->retire_data_urb = NULL;
1811                 subs->running = 0;
1812                 return 0;
1813         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1814                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1815                 subs->running = 1;
1816                 return 0;
1817         case SNDRV_PCM_TRIGGER_SUSPEND:
1818                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1819                         stop_endpoints(subs);
1820                         subs->need_setup_fmt = true;
1821                         return 0;
1822                 }
1823                 break;
1824         }
1825
1826         return -EINVAL;
1827 }
1828
1829 static const struct snd_pcm_ops snd_usb_playback_ops = {
1830         .open =         snd_usb_pcm_open,
1831         .close =        snd_usb_pcm_close,
1832         .hw_params =    snd_usb_hw_params,
1833         .hw_free =      snd_usb_hw_free,
1834         .prepare =      snd_usb_pcm_prepare,
1835         .trigger =      snd_usb_substream_playback_trigger,
1836         .sync_stop =    snd_usb_pcm_sync_stop,
1837         .pointer =      snd_usb_pcm_pointer,
1838 };
1839
1840 static const struct snd_pcm_ops snd_usb_capture_ops = {
1841         .open =         snd_usb_pcm_open,
1842         .close =        snd_usb_pcm_close,
1843         .hw_params =    snd_usb_hw_params,
1844         .hw_free =      snd_usb_hw_free,
1845         .prepare =      snd_usb_pcm_prepare,
1846         .trigger =      snd_usb_substream_capture_trigger,
1847         .sync_stop =    snd_usb_pcm_sync_stop,
1848         .pointer =      snd_usb_pcm_pointer,
1849 };
1850
1851 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1852 {
1853         const struct snd_pcm_ops *ops;
1854
1855         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1856                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1857         snd_pcm_set_ops(pcm, stream, ops);
1858 }
1859
1860 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1861 {
1862         struct snd_pcm *pcm = subs->stream->pcm;
1863         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1864         struct device *dev = subs->dev->bus->controller;
1865
1866         if (snd_usb_use_vmalloc)
1867                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1868                                            NULL, 0, 0);
1869         else
1870                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1871                                            dev, 64*1024, 512*1024);
1872 }