sound/usb/pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/slab.h>
   7 #include <linux/bitrev.h>
   8 #include <linux/ratelimit.h>
   9 #include <linux/usb.h>
  10 #include <linux/usb/audio.h>
  11 #include <linux/usb/audio-v2.h>
  12
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16
  17 #include "usbaudio.h"
  18 #include "card.h"
  19 #include "quirks.h"
  20 #include "debug.h"
  21 #include "endpoint.h"
  22 #include "helper.h"
  23 #include "pcm.h"
  24 #include "clock.h"
  25 #include "power.h"
  26 #include "media.h"
  27
  28 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  29 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  30
  31 /* return the estimated delay based on USB frame counters */
  32 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33                                     unsigned int rate)
  34 {
  35         int current_frame_number;
  36         int frame_diff;
  37         int est_delay;
  38
  39         if (!subs->last_delay)
  40                 return 0; /* short path */
  41
  42         current_frame_number = usb_get_current_frame_number(subs->dev);
  43         /*
  44          * HCD implementations use different widths, use lower 8 bits.
  45          * The delay will be managed up to 256ms, which is more than
  46          * enough
  47          */
  48         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  49
  50         /* Approximation based on number of samples per USB frame (ms),
  51            some truncation for 44.1 but the estimate is good enough */
  52         est_delay =  frame_diff * rate / 1000;
  53         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  54                 est_delay = subs->last_delay - est_delay;
  55         else
  56                 est_delay = subs->last_delay + est_delay;
  57
  58         if (est_delay < 0)
  59                 est_delay = 0;
  60         return est_delay;
  61 }
  62
  63 /*
  64  * return the current pcm pointer.  just based on the hwptr_done value.
  65  */
  66 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  67 {
  68         struct snd_usb_substream *subs = substream->runtime->private_data;
  69         unsigned int hwptr_done;
  70
  71         if (atomic_read(&subs->stream->chip->shutdown))
  72                 return SNDRV_PCM_POS_XRUN;
  73         spin_lock(&subs->lock);
  74         hwptr_done = subs->hwptr_done;
  75         substream->runtime->delay = snd_usb_pcm_delay(subs,
  76                                                 substream->runtime->rate);
  77         spin_unlock(&subs->lock);
  78         return hwptr_done / (substream->runtime->frame_bits >> 3);
  79 }
  80
  81 /*
  82  * find a matching audio format
  83  */
  84 static struct audioformat *find_format(struct snd_usb_substream *subs)
  85 {
  86         struct audioformat *fp;
  87         struct audioformat *found = NULL;
  88         int cur_attr = 0, attr;
  89
  90         list_for_each_entry(fp, &subs->fmt_list, list) {
  91                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
  92                         continue;
  93                 if (fp->channels != subs->channels)
  94                         continue;
  95                 if (subs->cur_rate < fp->rate_min ||
  96                     subs->cur_rate > fp->rate_max)
  97                         continue;
  98                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  99                         unsigned int i;
 100                         for (i = 0; i < fp->nr_rates; i++)
 101                                 if (fp->rate_table[i] == subs->cur_rate)
 102                                         break;
 103                         if (i >= fp->nr_rates)
 104                                 continue;
 105                 }
 106                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 107                 if (! found) {
 108                         found = fp;
 109                         cur_attr = attr;
 110                         continue;
 111                 }
 112                 /* avoid async out and adaptive in if the other method
 113                  * supports the same format.
 114                  * this is a workaround for the case like
 115                  * M-audio audiophile USB.
 116                  */
 117                 if (attr != cur_attr) {
 118                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 119                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 120                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 121                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 122                                 continue;
 123                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 127                                 found = fp;
 128                                 cur_attr = attr;
 129                                 continue;
 130                         }
 131                 }
 132                 /* find the format with the largest max. packet size */
 133                 if (fp->maxpacksize > found->maxpacksize) {
 134                         found = fp;
 135                         cur_attr = attr;
 136                 }
 137         }
 138         return found;
 139 }
 140
 141 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 142                          struct usb_host_interface *alts,
 143                          struct audioformat *fmt)
 144 {
 145         struct usb_device *dev = chip->dev;
 146         unsigned int ep;
 147         unsigned char data[1];
 148         int err;
 149
 150         if (get_iface_desc(alts)->bNumEndpoints < 1)
 151                 return -EINVAL;
 152         ep = get_endpoint(alts, 0)->bEndpointAddress;
 153
 154         data[0] = 1;
 155         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 156                               USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 157                               UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 158                               data, sizeof(data));
 159         if (err < 0) {
 160                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 161                               iface, ep);
 162                 return err;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 169                          struct usb_host_interface *alts,
 170                          struct audioformat *fmt)
 171 {
 172         struct usb_device *dev = chip->dev;
 173         unsigned char data[1];
 174         int err;
 175
 176         data[0] = 1;
 177         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 178                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 179                               UAC2_EP_CS_PITCH << 8, 0,
 180                               data, sizeof(data));
 181         if (err < 0) {
 182                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 183                               iface, fmt->altsetting);
 184                 return err;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /*
 191  * initialize the pitch control and sample rate
 192  */
 193 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 194                        struct usb_host_interface *alts,
 195                        struct audioformat *fmt)
 196 {
 197         /* if endpoint doesn't have pitch control, bail out */
 198         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199                 return 0;
 200
 201         switch (fmt->protocol) {
 202         case UAC_VERSION_1:
 203         default:
 204                 return init_pitch_v1(chip, iface, alts, fmt);
 205
 206         case UAC_VERSION_2:
 207                 return init_pitch_v2(chip, iface, alts, fmt);
 208         }
 209 }
 210
 211 static int start_endpoints(struct snd_usb_substream *subs)
 212 {
 213         int err;
 214
 215         if (!subs->data_endpoint)
 216                 return -EINVAL;
 217
 218         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 219                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 220
 221                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 222
 223                 ep->data_subs = subs;
 224                 err = snd_usb_endpoint_start(ep);
 225                 if (err < 0) {
 226                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 227                         return err;
 228                 }
 229         }
 230
 231         if (subs->sync_endpoint &&
 232             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 233                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 234
 235                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 236                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 237                         err = usb_set_interface(subs->dev,
 238                                                 subs->sync_endpoint->iface,
 239                                                 subs->sync_endpoint->altsetting);
 240                         if (err < 0) {
 241                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 242                                 dev_err(&subs->dev->dev,
 243                                            "%d:%d: cannot set interface (%d)\n",
 244                                            subs->sync_endpoint->iface,
 245                                            subs->sync_endpoint->altsetting, err);
 246                                 return -EIO;
 247                         }
 248                 }
 249
 250                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 251
 252                 ep->sync_slave = subs->data_endpoint;
 253                 err = snd_usb_endpoint_start(ep);
 254                 if (err < 0) {
 255                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 256                         return err;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 static void sync_pending_stops(struct snd_usb_substream *subs)
 264 {
 265         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 266         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 267 }
 268
 269 static void stop_endpoints(struct snd_usb_substream *subs)
 270 {
 271         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 272                 snd_usb_endpoint_stop(subs->sync_endpoint);
 273
 274         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 275                 snd_usb_endpoint_stop(subs->data_endpoint);
 276 }
 277
 278 /* PCM sync_stop callback */
 279 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 280 {
 281         struct snd_usb_substream *subs = substream->runtime->private_data;
 282
 283         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 284                 sync_pending_stops(subs);
 285                 snd_usb_unlock_shutdown(subs->stream->chip);
 286         }
 287         return 0;
 288 }
 289
 290 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 291                                      unsigned int altsetting,
 292                                      struct usb_host_interface **alts,
 293                                      unsigned int *ep)
 294 {
 295         struct usb_interface *iface;
 296         struct usb_interface_descriptor *altsd;
 297         struct usb_endpoint_descriptor *epd;
 298
 299         iface = usb_ifnum_to_if(dev, ifnum);
 300         if (!iface || iface->num_altsetting < altsetting + 1)
 301                 return -ENOENT;
 302         *alts = &iface->altsetting[altsetting];
 303         altsd = get_iface_desc(*alts);
 304         if (altsd->bAlternateSetting != altsetting ||
 305             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 306             (altsd->bInterfaceSubClass != 2 &&
 307              altsd->bInterfaceProtocol != 2   ) ||
 308             altsd->bNumEndpoints < 1)
 309                 return -ENOENT;
 310         epd = get_endpoint(*alts, 0);
 311         if (!usb_endpoint_is_isoc_in(epd) ||
 312             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 313                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 314                 return -ENOENT;
 315         *ep = epd->bEndpointAddress;
 316         return 0;
 317 }
 318
 319 /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 320  * applies. Returns 1 if a quirk was found.
 321  */
 322 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 323                                          struct usb_device *dev,
 324                                          struct usb_interface_descriptor *altsd,
 325                                          unsigned int attr)
 326 {
 327         struct usb_host_interface *alts;
 328         struct usb_interface *iface;
 329         unsigned int ep;
 330         unsigned int ifnum;
 331
 332         /* Implicit feedback sync EPs consumers are always playback EPs */
 333         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 334                 return 0;
 335
 336         switch (subs->stream->chip->usb_id) {
 337         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 338         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 339                 ep = 0x81;
 340                 ifnum = 3;
 341                 goto add_sync_ep_from_ifnum;
 342         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 343         case USB_ID(0x0763, 0x2081):
 344                 ep = 0x81;
 345                 ifnum = 2;
 346                 goto add_sync_ep_from_ifnum;
 347         case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 348                 ep = 0x86;
 349                 ifnum = 2;
 350                 goto add_sync_ep_from_ifnum;
 351         case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 352                 ep = 0x81;
 353                 ifnum = 2;
 354                 goto add_sync_ep_from_ifnum;
 355         case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 356         case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 357                 ep = 0x81;
 358                 ifnum = 1;
 359                 goto add_sync_ep_from_ifnum;
 360         case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
 361                 /* MicroBook IIc */
 362                 if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
 363                         return 0;
 364
 365                 /* MicroBook II */
 366                 ep = 0x84;
 367                 ifnum = 0;
 368                 goto add_sync_ep_from_ifnum;
 369         case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
 370         case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
 371                 ep = 0x81;
 372                 ifnum = 2;
 373                 goto add_sync_ep_from_ifnum;
 374         case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 375                 ep = 0x82;
 376                 ifnum = 0;
 377                 goto add_sync_ep_from_ifnum;
 378         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 379                 /* BOSS Katana amplifiers do not need quirks */
 380                 return 0;
 381         }
 382
 383         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 384             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 385             altsd->bInterfaceProtocol == 2 &&
 386             altsd->bNumEndpoints == 1 &&
 387             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 388             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 389                                       altsd->bAlternateSetting,
 390                                       &alts, &ep) >= 0) {
 391                 goto add_sync_ep;
 392         }
 393
 394         /* No quirk */
 395         return 0;
 396
 397 add_sync_ep_from_ifnum:
 398         iface = usb_ifnum_to_if(dev, ifnum);
 399
 400         if (!iface || iface->num_altsetting < 2)
 401                 return -EINVAL;
 402
 403         alts = &iface->altsetting[1];
 404
 405 add_sync_ep:
 406         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 407                                                    alts, ep, !subs->direction,
 408                                                    SND_USB_ENDPOINT_TYPE_DATA);
 409         if (!subs->sync_endpoint)
 410                 return -EINVAL;
 411
 412         subs->sync_endpoint->is_implicit_feedback = 1;
 413
 414         subs->data_endpoint->sync_master = subs->sync_endpoint;
 415
 416         return 1;
 417 }
 418
 419 static int set_sync_endpoint(struct snd_usb_substream *subs,
 420                              struct audioformat *fmt,
 421                              struct usb_device *dev,
 422                              struct usb_host_interface *alts,
 423                              struct usb_interface_descriptor *altsd)
 424 {
 425         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 426         unsigned int ep, attr;
 427         bool implicit_fb;
 428         int err;
 429
 430         /* we need a sync pipe in async OUT or adaptive IN mode */
 431         /* check the number of EP, since some devices have broken
 432          * descriptors which fool us.  if it has only one EP,
 433          * assume it as adaptive-out or sync-in.
 434          */
 435         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 436
 437         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 438                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 439
 440                 /*
 441                  * In these modes the notion of sync_endpoint is irrelevant.
 442                  * Reset pointers to avoid using stale data from previously
 443                  * used settings, e.g. when configuration and endpoints were
 444                  * changed
 445                  */
 446
 447                 subs->sync_endpoint = NULL;
 448                 subs->data_endpoint->sync_master = NULL;
 449         }
 450
 451         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 452         if (err < 0)
 453                 return err;
 454
 455         /* endpoint set by quirk */
 456         if (err > 0)
 457                 return 0;
 458
 459         if (altsd->bNumEndpoints < 2)
 460                 return 0;
 461
 462         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 463                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 464             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 465                 return 0;
 466
 467         /*
 468          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 469          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 470          * error fall back to SYNC mode and don't create sync endpoint
 471          */
 472
 473         /* check sync-pipe endpoint */
 474         /* ... and check descriptor size before accessing bSynchAddress
 475            because there is a version of the SB Audigy 2 NX firmware lacking
 476            the audio fields in the endpoint descriptors */
 477         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 478             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 479              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 480                 dev_err(&dev->dev,
 481                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 482                            fmt->iface, fmt->altsetting,
 483                            get_endpoint(alts, 1)->bmAttributes,
 484                            get_endpoint(alts, 1)->bLength,
 485                            get_endpoint(alts, 1)->bSynchAddress);
 486                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 487                         return 0;
 488                 return -EINVAL;
 489         }
 490         ep = get_endpoint(alts, 1)->bEndpointAddress;
 491         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 492             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 493             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 494              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 495                 dev_err(&dev->dev,
 496                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 497                            fmt->iface, fmt->altsetting,
 498                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 499                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 500                         return 0;
 501                 return -EINVAL;
 502         }
 503
 504         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 505                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 506
 507         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 508                                                    alts, ep, !subs->direction,
 509                                                    implicit_fb ?
 510                                                         SND_USB_ENDPOINT_TYPE_DATA :
 511                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 512
 513         if (!subs->sync_endpoint) {
 514                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 515                         return 0;
 516                 return -EINVAL;
 517         }
 518
 519         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 520
 521         subs->data_endpoint->sync_master = subs->sync_endpoint;
 522
 523         return 0;
 524 }
 525
 526 /*
 527  * find a matching format and set up the interface
 528  */
 529 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 530 {
 531         struct usb_device *dev = subs->dev;
 532         struct usb_host_interface *alts;
 533         struct usb_interface_descriptor *altsd;
 534         struct usb_interface *iface;
 535         int err;
 536
 537         iface = usb_ifnum_to_if(dev, fmt->iface);
 538         if (WARN_ON(!iface))
 539                 return -EINVAL;
 540         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 541         if (WARN_ON(!alts))
 542                 return -EINVAL;
 543         altsd = get_iface_desc(alts);
 544
 545         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 546                 return 0;
 547
 548         /* close the old interface */
 549         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 550                 if (!subs->stream->chip->keep_iface) {
 551                         err = usb_set_interface(subs->dev, subs->interface, 0);
 552                         if (err < 0) {
 553                                 dev_err(&dev->dev,
 554                                         "%d:%d: return to setting 0 failed (%d)\n",
 555                                         fmt->iface, fmt->altsetting, err);
 556                                 return -EIO;
 557                         }
 558                 }
 559                 subs->interface = -1;
 560                 subs->altset_idx = 0;
 561         }
 562
 563         if (subs->need_setup_fmt)
 564                 subs->need_setup_fmt = false;
 565
 566         /* set interface */
 567         if (iface->cur_altsetting != alts) {
 568                 err = snd_usb_select_mode_quirk(subs, fmt);
 569                 if (err < 0)
 570                         return -EIO;
 571
 572                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 573                 if (err < 0) {
 574                         dev_err(&dev->dev,
 575                                 "%d:%d: usb_set_interface failed (%d)\n",
 576                                 fmt->iface, fmt->altsetting, err);
 577                         return -EIO;
 578                 }
 579                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 580                         fmt->iface, fmt->altsetting);
 581                 snd_usb_set_interface_quirk(dev);
 582         }
 583
 584         subs->interface = fmt->iface;
 585         subs->altset_idx = fmt->altset_idx;
 586         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 587                                                    alts, fmt->endpoint, subs->direction,
 588                                                    SND_USB_ENDPOINT_TYPE_DATA);
 589
 590         if (!subs->data_endpoint)
 591                 return -EINVAL;
 592
 593         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 594         if (err < 0)
 595                 return err;
 596
 597         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 598         if (err < 0)
 599                 return err;
 600
 601         subs->cur_audiofmt = fmt;
 602
 603         snd_usb_set_format_quirk(subs, fmt);
 604
 605         return 0;
 606 }
 607
 608 /*
 609  * Return the score of matching two audioformats.
 610  * Veto the audioformat if:
 611  * - It has no channels for some reason.
 612  * - Requested PCM format is not supported.
 613  * - Requested sample rate is not supported.
 614  */
 615 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 616                                        struct audioformat *fp,
 617                                        struct audioformat *match, int rate,
 618                                        snd_pcm_format_t pcm_format)
 619 {
 620         int i;
 621         int score = 0;
 622
 623         if (fp->channels < 1) {
 624                 dev_dbg(&subs->dev->dev,
 625                         "%s: (fmt @%p) no channels\n", __func__, fp);
 626                 return 0;
 627         }
 628
 629         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 630                 dev_dbg(&subs->dev->dev,
 631                         "%s: (fmt @%p) no match for format %d\n", __func__,
 632                         fp, pcm_format);
 633                 return 0;
 634         }
 635
 636         for (i = 0; i < fp->nr_rates; i++) {
 637                 if (fp->rate_table[i] == rate) {
 638                         score++;
 639                         break;
 640                 }
 641         }
 642         if (!score) {
 643                 dev_dbg(&subs->dev->dev,
 644                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 645                         fp, rate);
 646                 return 0;
 647         }
 648
 649         if (fp->channels == match->channels)
 650                 score++;
 651
 652         dev_dbg(&subs->dev->dev,
 653                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 654
 655         return score;
 656 }
 657
 658 /*
 659  * Configure the sync ep using the rate and pcm format of the data ep.
 660  */
 661 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 662 {
 663         int ret;
 664         struct audioformat *fp;
 665         struct audioformat *sync_fp = NULL;
 666         int cur_score = 0;
 667         int sync_period_bytes = subs->period_bytes;
 668         struct snd_usb_substream *sync_subs =
 669                 &subs->stream->substream[subs->direction ^ 1];
 670
 671         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 672             !subs->stream)
 673                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 674                                                    subs->pcm_format,
 675                                                    subs->channels,
 676                                                    subs->period_bytes,
 677                                                    0, 0,
 678                                                    subs->cur_rate,
 679                                                    subs->cur_audiofmt,
 680                                                    NULL);
 681
 682         /* Try to find the best matching audioformat. */
 683         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 684                 int score = match_endpoint_audioformats(subs,
 685                                                         fp, subs->cur_audiofmt,
 686                         subs->cur_rate, subs->pcm_format);
 687
 688                 if (score > cur_score) {
 689                         sync_fp = fp;
 690                         cur_score = score;
 691                 }
 692         }
 693
 694         if (unlikely(sync_fp == NULL)) {
 695                 dev_err(&subs->dev->dev,
 696                         "%s: no valid audioformat for sync ep %x found\n",
 697                         __func__, sync_subs->ep_num);
 698                 return -EINVAL;
 699         }
 700
 701         /*
 702          * Recalculate the period bytes if channel number differ between
 703          * data and sync ep audioformat.
 704          */
 705         if (sync_fp->channels != subs->channels) {
 706                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 707                         sync_fp->channels;
 708                 dev_dbg(&subs->dev->dev,
 709                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 710                         __func__, subs->period_bytes, sync_period_bytes);
 711         }
 712
 713         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 714                                           subs->pcm_format,
 715                                           sync_fp->channels,
 716                                           sync_period_bytes,
 717                                           0, 0,
 718                                           subs->cur_rate,
 719                                           sync_fp,
 720                                           NULL);
 721
 722         return ret;
 723 }
 724
 725 /*
 726  * configure endpoint params
 727  *
 728  * called  during initial setup and upon resume
 729  */
 730 static int configure_endpoint(struct snd_usb_substream *subs)
 731 {
 732         int ret;
 733
 734         /* format changed */
 735         stop_endpoints(subs);
 736         sync_pending_stops(subs);
 737         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 738                                           subs->pcm_format,
 739                                           subs->channels,
 740                                           subs->period_bytes,
 741                                           subs->period_frames,
 742                                           subs->buffer_periods,
 743                                           subs->cur_rate,
 744                                           subs->cur_audiofmt,
 745                                           subs->sync_endpoint);
 746         if (ret < 0)
 747                 return ret;
 748
 749         if (subs->sync_endpoint)
 750                 ret = configure_sync_endpoint(subs);
 751
 752         return ret;
 753 }
 754
 755 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 756 {
 757         int ret;
 758
 759         if (!subs->str_pd)
 760                 return 0;
 761
 762         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 763         if (ret < 0) {
 764                 dev_err(&subs->dev->dev,
 765                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 766                         subs->str_pd->pd_id, state, ret);
 767                 return ret;
 768         }
 769
 770         return 0;
 771 }
 772
 773 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 774 {
 775         int ret;
 776
 777         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 778         if (ret < 0)
 779                 return ret;
 780
 781         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 782         if (ret < 0)
 783                 return ret;
 784
 785         return 0;
 786 }
 787
 788 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 789 {
 790         int ret;
 791
 792         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 793         if (ret < 0)
 794                 return ret;
 795
 796         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 797         if (ret < 0)
 798                 return ret;
 799
 800         return 0;
 801 }
 802
 803 /*
 804  * hw_params callback
 805  *
 806  * allocate a buffer and set the given audio format.
 807  *
 808  * so far we use a physically linear buffer although packetize transfer
 809  * doesn't need a continuous area.
 810  * if sg buffer is supported on the later version of alsa, we'll follow
 811  * that.
 812  */
 813 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 814                              struct snd_pcm_hw_params *hw_params)
 815 {
 816         struct snd_usb_substream *subs = substream->runtime->private_data;
 817         struct audioformat *fmt;
 818         int ret;
 819
 820         ret = snd_media_start_pipeline(subs);
 821         if (ret)
 822                 return ret;
 823
 824         subs->pcm_format = params_format(hw_params);
 825         subs->period_bytes = params_period_bytes(hw_params);
 826         subs->period_frames = params_period_size(hw_params);
 827         subs->buffer_periods = params_periods(hw_params);
 828         subs->channels = params_channels(hw_params);
 829         subs->cur_rate = params_rate(hw_params);
 830
 831         fmt = find_format(subs);
 832         if (!fmt) {
 833                 dev_dbg(&subs->dev->dev,
 834                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 835                            subs->pcm_format, subs->cur_rate, subs->channels);
 836                 ret = -EINVAL;
 837                 goto stop_pipeline;
 838         }
 839
 840         ret = snd_usb_lock_shutdown(subs->stream->chip);
 841         if (ret < 0)
 842                 goto stop_pipeline;
 843
 844         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 845         if (ret < 0)
 846                 goto unlock;
 847
 848         ret = set_format(subs, fmt);
 849         if (ret < 0)
 850                 goto unlock;
 851
 852         subs->interface = fmt->iface;
 853         subs->altset_idx = fmt->altset_idx;
 854         subs->need_setup_ep = true;
 855
 856  unlock:
 857         snd_usb_unlock_shutdown(subs->stream->chip);
 858         if (ret < 0)
 859                 goto stop_pipeline;
 860         return ret;
 861
 862  stop_pipeline:
 863         snd_media_stop_pipeline(subs);
 864         return ret;
 865 }
 866
 867 /*
 868  * hw_free callback
 869  *
 870  * reset the audio format and release the buffer
 871  */
 872 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 873 {
 874         struct snd_usb_substream *subs = substream->runtime->private_data;
 875
 876         snd_media_stop_pipeline(subs);
 877         subs->cur_audiofmt = NULL;
 878         subs->cur_rate = 0;
 879         subs->period_bytes = 0;
 880         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 881                 stop_endpoints(subs);
 882                 sync_pending_stops(subs);
 883                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 884                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 885                 snd_usb_unlock_shutdown(subs->stream->chip);
 886         }
 887
 888         return 0;
 889 }
 890
 891 /*
 892  * prepare callback
 893  *
 894  * only a few subtle things...
 895  */
 896 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 897 {
 898         struct snd_pcm_runtime *runtime = substream->runtime;
 899         struct snd_usb_substream *subs = runtime->private_data;
 900         struct usb_host_interface *alts;
 901         struct usb_interface *iface;
 902         int ret;
 903
 904         if (! subs->cur_audiofmt) {
 905                 dev_err(&subs->dev->dev, "no format is specified!\n");
 906                 return -ENXIO;
 907         }
 908
 909         ret = snd_usb_lock_shutdown(subs->stream->chip);
 910         if (ret < 0)
 911                 return ret;
 912         if (snd_BUG_ON(!subs->data_endpoint)) {
 913                 ret = -EIO;
 914                 goto unlock;
 915         }
 916
 917         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 918         if (ret < 0)
 919                 goto unlock;
 920
 921         ret = set_format(subs, subs->cur_audiofmt);
 922         if (ret < 0)
 923                 goto unlock;
 924
 925         if (subs->need_setup_ep) {
 926
 927                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 928                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 929                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 930                                                subs->cur_audiofmt->iface,
 931                                                alts,
 932                                                subs->cur_audiofmt,
 933                                                subs->cur_rate);
 934                 if (ret < 0)
 935                         goto unlock;
 936
 937                 ret = configure_endpoint(subs);
 938                 if (ret < 0)
 939                         goto unlock;
 940                 subs->need_setup_ep = false;
 941         }
 942
 943         /* some unit conversions in runtime */
 944         subs->data_endpoint->maxframesize =
 945                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 946         subs->data_endpoint->curframesize =
 947                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 948
 949         /* reset the pointer */
 950         subs->hwptr_done = 0;
 951         subs->transfer_done = 0;
 952         subs->last_delay = 0;
 953         subs->last_frame_number = 0;
 954         runtime->delay = 0;
 955
 956         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 957          * updates for all URBs would happen at the same time when starting */
 958         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 959                 ret = start_endpoints(subs);
 960
 961  unlock:
 962         snd_usb_unlock_shutdown(subs->stream->chip);
 963         return ret;
 964 }
 965
 966 static const struct snd_pcm_hardware snd_usb_hardware =
 967 {
 968         .info =                 SNDRV_PCM_INFO_MMAP |
 969                                 SNDRV_PCM_INFO_MMAP_VALID |
 970                                 SNDRV_PCM_INFO_BATCH |
 971                                 SNDRV_PCM_INFO_INTERLEAVED |
 972                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 973                                 SNDRV_PCM_INFO_PAUSE,
 974         .buffer_bytes_max =     1024 * 1024,
 975         .period_bytes_min =     64,
 976         .period_bytes_max =     512 * 1024,
 977         .periods_min =          2,
 978         .periods_max =          1024,
 979 };
 980
 981 static int hw_check_valid_format(struct snd_usb_substream *subs,
 982                                  struct snd_pcm_hw_params *params,
 983                                  struct audioformat *fp)
 984 {
 985         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 986         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 987         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 988         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 989         struct snd_mask check_fmts;
 990         unsigned int ptime;
 991
 992         /* check the format */
 993         snd_mask_none(&check_fmts);
 994         check_fmts.bits[0] = (u32)fp->formats;
 995         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 996         snd_mask_intersect(&check_fmts, fmts);
 997         if (snd_mask_empty(&check_fmts)) {
 998                 hwc_debug("   > check: no supported format %d\n", fp->format);
 999                 return 0;
1000         }
1001         /* check the channels */
1002         if (fp->channels < ct->min || fp->channels > ct->max) {
1003                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1004                 return 0;
1005         }
1006         /* check the rate is within the range */
1007         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1008                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1009                 return 0;
1010         }
1011         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1012                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1013                 return 0;
1014         }
1015         /* check whether the period time is >= the data packet interval */
1016         if (subs->speed != USB_SPEED_FULL) {
1017                 ptime = 125 * (1 << fp->datainterval);
1018                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1019                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1020                         return 0;
1021                 }
1022         }
1023         return 1;
1024 }
1025
1026 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1027                         struct snd_pcm_hw_rule *rule)
1028 {
1029         struct snd_usb_substream *subs = rule->private;
1030         struct audioformat *fp;
1031         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1032         unsigned int rmin, rmax;
1033         int changed;
1034
1035         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1036         changed = 0;
1037         rmin = rmax = 0;
1038         list_for_each_entry(fp, &subs->fmt_list, list) {
1039                 if (!hw_check_valid_format(subs, params, fp))
1040                         continue;
1041                 if (changed++) {
1042                         if (rmin > fp->rate_min)
1043                                 rmin = fp->rate_min;
1044                         if (rmax < fp->rate_max)
1045                                 rmax = fp->rate_max;
1046                 } else {
1047                         rmin = fp->rate_min;
1048                         rmax = fp->rate_max;
1049                 }
1050         }
1051
1052         if (!changed) {
1053                 hwc_debug("  --> get empty\n");
1054                 it->empty = 1;
1055                 return -EINVAL;
1056         }
1057
1058         changed = 0;
1059         if (it->min < rmin) {
1060                 it->min = rmin;
1061                 it->openmin = 0;
1062                 changed = 1;
1063         }
1064         if (it->max > rmax) {
1065                 it->max = rmax;
1066                 it->openmax = 0;
1067                 changed = 1;
1068         }
1069         if (snd_interval_checkempty(it)) {
1070                 it->empty = 1;
1071                 return -EINVAL;
1072         }
1073         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1074         return changed;
1075 }
1076
1077
1078 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1079                             struct snd_pcm_hw_rule *rule)
1080 {
1081         struct snd_usb_substream *subs = rule->private;
1082         struct audioformat *fp;
1083         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1084         unsigned int rmin, rmax;
1085         int changed;
1086
1087         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1088         changed = 0;
1089         rmin = rmax = 0;
1090         list_for_each_entry(fp, &subs->fmt_list, list) {
1091                 if (!hw_check_valid_format(subs, params, fp))
1092                         continue;
1093                 if (changed++) {
1094                         if (rmin > fp->channels)
1095                                 rmin = fp->channels;
1096                         if (rmax < fp->channels)
1097                                 rmax = fp->channels;
1098                 } else {
1099                         rmin = fp->channels;
1100                         rmax = fp->channels;
1101                 }
1102         }
1103
1104         if (!changed) {
1105                 hwc_debug("  --> get empty\n");
1106                 it->empty = 1;
1107                 return -EINVAL;
1108         }
1109
1110         changed = 0;
1111         if (it->min < rmin) {
1112                 it->min = rmin;
1113                 it->openmin = 0;
1114                 changed = 1;
1115         }
1116         if (it->max > rmax) {
1117                 it->max = rmax;
1118                 it->openmax = 0;
1119                 changed = 1;
1120         }
1121         if (snd_interval_checkempty(it)) {
1122                 it->empty = 1;
1123                 return -EINVAL;
1124         }
1125         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1126         return changed;
1127 }
1128
1129 static int hw_rule_format(struct snd_pcm_hw_params *params,
1130                           struct snd_pcm_hw_rule *rule)
1131 {
1132         struct snd_usb_substream *subs = rule->private;
1133         struct audioformat *fp;
1134         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1135         u64 fbits;
1136         u32 oldbits[2];
1137         int changed;
1138
1139         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1140         fbits = 0;
1141         list_for_each_entry(fp, &subs->fmt_list, list) {
1142                 if (!hw_check_valid_format(subs, params, fp))
1143                         continue;
1144                 fbits |= fp->formats;
1145         }
1146
1147         oldbits[0] = fmt->bits[0];
1148         oldbits[1] = fmt->bits[1];
1149         fmt->bits[0] &= (u32)fbits;
1150         fmt->bits[1] &= (u32)(fbits >> 32);
1151         if (!fmt->bits[0] && !fmt->bits[1]) {
1152                 hwc_debug("  --> get empty\n");
1153                 return -EINVAL;
1154         }
1155         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1156         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1157         return changed;
1158 }
1159
1160 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1161                                struct snd_pcm_hw_rule *rule)
1162 {
1163         struct snd_usb_substream *subs = rule->private;
1164         struct audioformat *fp;
1165         struct snd_interval *it;
1166         unsigned char min_datainterval;
1167         unsigned int pmin;
1168         int changed;
1169
1170         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1171         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1172         min_datainterval = 0xff;
1173         list_for_each_entry(fp, &subs->fmt_list, list) {
1174                 if (!hw_check_valid_format(subs, params, fp))
1175                         continue;
1176                 min_datainterval = min(min_datainterval, fp->datainterval);
1177         }
1178         if (min_datainterval == 0xff) {
1179                 hwc_debug("  --> get empty\n");
1180                 it->empty = 1;
1181                 return -EINVAL;
1182         }
1183         pmin = 125 * (1 << min_datainterval);
1184         changed = 0;
1185         if (it->min < pmin) {
1186                 it->min = pmin;
1187                 it->openmin = 0;
1188                 changed = 1;
1189         }
1190         if (snd_interval_checkempty(it)) {
1191                 it->empty = 1;
1192                 return -EINVAL;
1193         }
1194         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1195         return changed;
1196 }
1197
1198 /*
1199  *  If the device supports unusual bit rates, does the request meet these?
1200  */
1201 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1202                                   struct snd_usb_substream *subs)
1203 {
1204         struct audioformat *fp;
1205         int *rate_list;
1206         int count = 0, needs_knot = 0;
1207         int err;
1208
1209         kfree(subs->rate_list.list);
1210         subs->rate_list.list = NULL;
1211
1212         list_for_each_entry(fp, &subs->fmt_list, list) {
1213                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1214                         return 0;
1215                 count += fp->nr_rates;
1216                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1217                         needs_knot = 1;
1218         }
1219         if (!needs_knot)
1220                 return 0;
1221
1222         subs->rate_list.list = rate_list =
1223                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1224         if (!subs->rate_list.list)
1225                 return -ENOMEM;
1226         subs->rate_list.count = count;
1227         subs->rate_list.mask = 0;
1228         count = 0;
1229         list_for_each_entry(fp, &subs->fmt_list, list) {
1230                 int i;
1231                 for (i = 0; i < fp->nr_rates; i++)
1232                         rate_list[count++] = fp->rate_table[i];
1233         }
1234         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1235                                          &subs->rate_list);
1236         if (err < 0)
1237                 return err;
1238
1239         return 0;
1240 }
1241
1242
1243 /*
1244  * set up the runtime hardware information.
1245  */
1246
1247 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1248 {
1249         struct audioformat *fp;
1250         unsigned int pt, ptmin;
1251         int param_period_time_if_needed;
1252         int err;
1253
1254         runtime->hw.formats = subs->formats;
1255
1256         runtime->hw.rate_min = 0x7fffffff;
1257         runtime->hw.rate_max = 0;
1258         runtime->hw.channels_min = 256;
1259         runtime->hw.channels_max = 0;
1260         runtime->hw.rates = 0;
1261         ptmin = UINT_MAX;
1262         /* check min/max rates and channels */
1263         list_for_each_entry(fp, &subs->fmt_list, list) {
1264                 runtime->hw.rates |= fp->rates;
1265                 if (runtime->hw.rate_min > fp->rate_min)
1266                         runtime->hw.rate_min = fp->rate_min;
1267                 if (runtime->hw.rate_max < fp->rate_max)
1268                         runtime->hw.rate_max = fp->rate_max;
1269                 if (runtime->hw.channels_min > fp->channels)
1270                         runtime->hw.channels_min = fp->channels;
1271                 if (runtime->hw.channels_max < fp->channels)
1272                         runtime->hw.channels_max = fp->channels;
1273                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1274                         /* FIXME: there might be more than one audio formats... */
1275                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1276                                 fp->frame_size;
1277                 }
1278                 pt = 125 * (1 << fp->datainterval);
1279                 ptmin = min(ptmin, pt);
1280         }
1281
1282         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1283         if (subs->speed == USB_SPEED_FULL)
1284                 /* full speed devices have fixed data packet interval */
1285                 ptmin = 1000;
1286         if (ptmin == 1000)
1287                 /* if period time doesn't go below 1 ms, no rules needed */
1288                 param_period_time_if_needed = -1;
1289
1290         err = snd_pcm_hw_constraint_minmax(runtime,
1291                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1292                                            ptmin, UINT_MAX);
1293         if (err < 0)
1294                 return err;
1295
1296         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1297                                   hw_rule_rate, subs,
1298                                   SNDRV_PCM_HW_PARAM_FORMAT,
1299                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1300                                   param_period_time_if_needed,
1301                                   -1);
1302         if (err < 0)
1303                 return err;
1304         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1305                                   hw_rule_channels, subs,
1306                                   SNDRV_PCM_HW_PARAM_FORMAT,
1307                                   SNDRV_PCM_HW_PARAM_RATE,
1308                                   param_period_time_if_needed,
1309                                   -1);
1310         if (err < 0)
1311                 return err;
1312         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1313                                   hw_rule_format, subs,
1314                                   SNDRV_PCM_HW_PARAM_RATE,
1315                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1316                                   param_period_time_if_needed,
1317                                   -1);
1318         if (err < 0)
1319                 return err;
1320         if (param_period_time_if_needed >= 0) {
1321                 err = snd_pcm_hw_rule_add(runtime, 0,
1322                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1323                                           hw_rule_period_time, subs,
1324                                           SNDRV_PCM_HW_PARAM_FORMAT,
1325                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1326                                           SNDRV_PCM_HW_PARAM_RATE,
1327                                           -1);
1328                 if (err < 0)
1329                         return err;
1330         }
1331         err = snd_usb_pcm_check_knot(runtime, subs);
1332         if (err < 0)
1333                 return err;
1334
1335         return snd_usb_autoresume(subs->stream->chip);
1336 }
1337
1338 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1339 {
1340         int direction = substream->stream;
1341         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1342         struct snd_pcm_runtime *runtime = substream->runtime;
1343         struct snd_usb_substream *subs = &as->substream[direction];
1344         int ret;
1345
1346         subs->interface = -1;
1347         subs->altset_idx = 0;
1348         runtime->hw = snd_usb_hardware;
1349         runtime->private_data = subs;
1350         subs->pcm_substream = substream;
1351         /* runtime PM is also done there */
1352
1353         /* initialize DSD/DOP context */
1354         subs->dsd_dop.byte_idx = 0;
1355         subs->dsd_dop.channel = 0;
1356         subs->dsd_dop.marker = 1;
1357
1358         ret = setup_hw_info(runtime, subs);
1359         if (ret == 0) {
1360                 ret = snd_media_stream_init(subs, as->pcm, direction);
1361                 if (ret)
1362                         snd_usb_autosuspend(subs->stream->chip);
1363         }
1364         return ret;
1365 }
1366
1367 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1368 {
1369         int direction = substream->stream;
1370         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1371         struct snd_usb_substream *subs = &as->substream[direction];
1372         int ret;
1373
1374         snd_media_stop_pipeline(subs);
1375
1376         if (!as->chip->keep_iface &&
1377             subs->interface >= 0 &&
1378             !snd_usb_lock_shutdown(subs->stream->chip)) {
1379                 usb_set_interface(subs->dev, subs->interface, 0);
1380                 subs->interface = -1;
1381                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1382                 snd_usb_unlock_shutdown(subs->stream->chip);
1383                 if (ret < 0)
1384                         return ret;
1385         }
1386
1387         subs->pcm_substream = NULL;
1388         snd_usb_autosuspend(subs->stream->chip);
1389
1390         return 0;
1391 }
1392
1393 /* Since a URB can handle only a single linear buffer, we must use double
1394  * buffering when the data to be transferred overflows the buffer boundary.
1395  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1396  * for all URBs.
1397  */
1398 static void retire_capture_urb(struct snd_usb_substream *subs,
1399                                struct urb *urb)
1400 {
1401         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1402         unsigned int stride, frames, bytes, oldptr;
1403         int i, period_elapsed = 0;
1404         unsigned long flags;
1405         unsigned char *cp;
1406         int current_frame_number;
1407
1408         /* read frame number here, update pointer in critical section */
1409         current_frame_number = usb_get_current_frame_number(subs->dev);
1410
1411         stride = runtime->frame_bits >> 3;
1412
1413         for (i = 0; i < urb->number_of_packets; i++) {
1414                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1415                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1416                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1417                                 i, urb->iso_frame_desc[i].status);
1418                         // continue;
1419                 }
1420                 bytes = urb->iso_frame_desc[i].actual_length;
1421                 frames = bytes / stride;
1422                 if (!subs->txfr_quirk)
1423                         bytes = frames * stride;
1424                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1425                         int oldbytes = bytes;
1426                         bytes = frames * stride;
1427                         dev_warn_ratelimited(&subs->dev->dev,
1428                                  "Corrected urb data len. %d->%d\n",
1429                                                         oldbytes, bytes);
1430                 }
1431                 /* update the current pointer */
1432                 spin_lock_irqsave(&subs->lock, flags);
1433                 oldptr = subs->hwptr_done;
1434                 subs->hwptr_done += bytes;
1435                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1436                         subs->hwptr_done -= runtime->buffer_size * stride;
1437                 frames = (bytes + (oldptr % stride)) / stride;
1438                 subs->transfer_done += frames;
1439                 if (subs->transfer_done >= runtime->period_size) {
1440                         subs->transfer_done -= runtime->period_size;
1441                         period_elapsed = 1;
1442                 }
1443                 /* capture delay is by construction limited to one URB,
1444                  * reset delays here
1445                  */
1446                 runtime->delay = subs->last_delay = 0;
1447
1448                 /* realign last_frame_number */
1449                 subs->last_frame_number = current_frame_number;
1450                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1451
1452                 spin_unlock_irqrestore(&subs->lock, flags);
1453                 /* copy a data chunk */
1454                 if (oldptr + bytes > runtime->buffer_size * stride) {
1455                         unsigned int bytes1 =
1456                                         runtime->buffer_size * stride - oldptr;
1457                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1458                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1459                 } else {
1460                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1461                 }
1462         }
1463
1464         if (period_elapsed)
1465                 snd_pcm_period_elapsed(subs->pcm_substream);
1466 }
1467
1468 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1469                                              struct urb *urb, unsigned int bytes)
1470 {
1471         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1472         unsigned int stride = runtime->frame_bits >> 3;
1473         unsigned int dst_idx = 0;
1474         unsigned int src_idx = subs->hwptr_done;
1475         unsigned int wrap = runtime->buffer_size * stride;
1476         u8 *dst = urb->transfer_buffer;
1477         u8 *src = runtime->dma_area;
1478         u8 marker[] = { 0x05, 0xfa };
1479
1480         /*
1481          * The DSP DOP format defines a way to transport DSD samples over
1482          * normal PCM data endpoints. It requires stuffing of marker bytes
1483          * (0x05 and 0xfa, alternating per sample frame), and then expects
1484          * 2 additional bytes of actual payload. The whole frame is stored
1485          * LSB.
1486          *
1487          * Hence, for a stereo transport, the buffer layout looks like this,
1488          * where L refers to left channel samples and R to right.
1489          *
1490          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1491          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1492          *   .....
1493          *
1494          */
1495
1496         while (bytes--) {
1497                 if (++subs->dsd_dop.byte_idx == 3) {
1498                         /* frame boundary? */
1499                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1500                         src_idx += 2;
1501                         subs->dsd_dop.byte_idx = 0;
1502
1503                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1504                                 /* alternate the marker */
1505                                 subs->dsd_dop.marker++;
1506                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1507                                 subs->dsd_dop.channel = 0;
1508                         }
1509                 } else {
1510                         /* stuff the DSD payload */
1511                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1512
1513                         if (subs->cur_audiofmt->dsd_bitrev)
1514                                 dst[dst_idx++] = bitrev8(src[idx]);
1515                         else
1516                                 dst[dst_idx++] = src[idx];
1517
1518                         subs->hwptr_done++;
1519                 }
1520         }
1521         if (subs->hwptr_done >= runtime->buffer_size * stride)
1522                 subs->hwptr_done -= runtime->buffer_size * stride;
1523 }
1524
1525 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1526                         int offset, int stride, unsigned int bytes)
1527 {
1528         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1529
1530         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1531                 /* err, the transferred area goes over buffer boundary. */
1532                 unsigned int bytes1 =
1533                         runtime->buffer_size * stride - subs->hwptr_done;
1534                 memcpy(urb->transfer_buffer + offset,
1535                        runtime->dma_area + subs->hwptr_done, bytes1);
1536                 memcpy(urb->transfer_buffer + offset + bytes1,
1537                        runtime->dma_area, bytes - bytes1);
1538         } else {
1539                 memcpy(urb->transfer_buffer + offset,
1540                        runtime->dma_area + subs->hwptr_done, bytes);
1541         }
1542         subs->hwptr_done += bytes;
1543         if (subs->hwptr_done >= runtime->buffer_size * stride)
1544                 subs->hwptr_done -= runtime->buffer_size * stride;
1545 }
1546
1547 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1548                                       struct urb *urb, int stride,
1549                                       unsigned int bytes)
1550 {
1551         __le32 packet_length;
1552         int i;
1553
1554         /* Put __le32 length descriptor at start of each packet. */
1555         for (i = 0; i < urb->number_of_packets; i++) {
1556                 unsigned int length = urb->iso_frame_desc[i].length;
1557                 unsigned int offset = urb->iso_frame_desc[i].offset;
1558
1559                 packet_length = cpu_to_le32(length);
1560                 offset += i * sizeof(packet_length);
1561                 urb->iso_frame_desc[i].offset = offset;
1562                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1563                 memcpy(urb->transfer_buffer + offset,
1564                        &packet_length, sizeof(packet_length));
1565                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1566                             stride, length);
1567         }
1568         /* Adjust transfer size accordingly. */
1569         bytes += urb->number_of_packets * sizeof(packet_length);
1570         return bytes;
1571 }
1572
1573 static void prepare_playback_urb(struct snd_usb_substream *subs,
1574                                  struct urb *urb)
1575 {
1576         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1577         struct snd_usb_endpoint *ep = subs->data_endpoint;
1578         struct snd_urb_ctx *ctx = urb->context;
1579         unsigned int counts, frames, bytes;
1580         int i, stride, period_elapsed = 0;
1581         unsigned long flags;
1582
1583         stride = runtime->frame_bits >> 3;
1584
1585         frames = 0;
1586         urb->number_of_packets = 0;
1587         spin_lock_irqsave(&subs->lock, flags);
1588         subs->frame_limit += ep->max_urb_frames;
1589         for (i = 0; i < ctx->packets; i++) {
1590                 if (ctx->packet_size[i])
1591                         counts = ctx->packet_size[i];
1592                 else if (ep->sync_master)
1593                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1594                 else
1595                         counts = snd_usb_endpoint_next_packet_size(ep);
1596
1597                 /* set up descriptor */
1598                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1599                 urb->iso_frame_desc[i].length = counts * ep->stride;
1600                 frames += counts;
1601                 urb->number_of_packets++;
1602                 subs->transfer_done += counts;
1603                 if (subs->transfer_done >= runtime->period_size) {
1604                         subs->transfer_done -= runtime->period_size;
1605                         subs->frame_limit = 0;
1606                         period_elapsed = 1;
1607                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1608                                 if (subs->transfer_done > 0) {
1609                                         /* FIXME: fill-max mode is not
1610                                          * supported yet */
1611                                         frames -= subs->transfer_done;
1612                                         counts -= subs->transfer_done;
1613                                         urb->iso_frame_desc[i].length =
1614                                                 counts * ep->stride;
1615                                         subs->transfer_done = 0;
1616                                 }
1617                                 i++;
1618                                 if (i < ctx->packets) {
1619                                         /* add a transfer delimiter */
1620                                         urb->iso_frame_desc[i].offset =
1621                                                 frames * ep->stride;
1622                                         urb->iso_frame_desc[i].length = 0;
1623                                         urb->number_of_packets++;
1624                                 }
1625                                 break;
1626                         }
1627                 }
1628                 /* finish at the period boundary or after enough frames */
1629                 if ((period_elapsed ||
1630                                 subs->transfer_done >= subs->frame_limit) &&
1631                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1632                         break;
1633         }
1634         bytes = frames * ep->stride;
1635
1636         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1637                      subs->cur_audiofmt->dsd_dop)) {
1638                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1639         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1640                            subs->cur_audiofmt->dsd_bitrev)) {
1641                 /* bit-reverse the bytes */
1642                 u8 *buf = urb->transfer_buffer;
1643                 for (i = 0; i < bytes; i++) {
1644                         int idx = (subs->hwptr_done + i)
1645                                 % (runtime->buffer_size * stride);
1646                         buf[i] = bitrev8(runtime->dma_area[idx]);
1647                 }
1648
1649                 subs->hwptr_done += bytes;
1650                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1651                         subs->hwptr_done -= runtime->buffer_size * stride;
1652         } else {
1653                 /* usual PCM */
1654                 if (!subs->tx_length_quirk)
1655                         copy_to_urb(subs, urb, 0, stride, bytes);
1656                 else
1657                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1658                         /* bytes is now amount of outgoing data */
1659         }
1660
1661         /* update delay with exact number of samples queued */
1662         runtime->delay = subs->last_delay;
1663         runtime->delay += frames;
1664         subs->last_delay = runtime->delay;
1665
1666         /* realign last_frame_number */
1667         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1668         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1669
1670         if (subs->trigger_tstamp_pending_update) {
1671                 /* this is the first actual URB submitted,
1672                  * update trigger timestamp to reflect actual start time
1673                  */
1674                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1675                 subs->trigger_tstamp_pending_update = false;
1676         }
1677
1678         spin_unlock_irqrestore(&subs->lock, flags);
1679         urb->transfer_buffer_length = bytes;
1680         if (period_elapsed)
1681                 snd_pcm_period_elapsed(subs->pcm_substream);
1682 }
1683
1684 /*
1685  * process after playback data complete
1686  * - decrease the delay count again
1687  */
1688 static void retire_playback_urb(struct snd_usb_substream *subs,
1689                                struct urb *urb)
1690 {
1691         unsigned long flags;
1692         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1693         struct snd_usb_endpoint *ep = subs->data_endpoint;
1694         int processed = urb->transfer_buffer_length / ep->stride;
1695         int est_delay;
1696
1697         /* ignore the delay accounting when procssed=0 is given, i.e.
1698          * silent payloads are procssed before handling the actual data
1699          */
1700         if (!processed)
1701                 return;
1702
1703         spin_lock_irqsave(&subs->lock, flags);
1704         if (!subs->last_delay)
1705                 goto out; /* short path */
1706
1707         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1708         /* update delay with exact number of samples played */
1709         if (processed > subs->last_delay)
1710                 subs->last_delay = 0;
1711         else
1712                 subs->last_delay -= processed;
1713         runtime->delay = subs->last_delay;
1714
1715         /*
1716          * Report when delay estimate is off by more than 2ms.
1717          * The error should be lower than 2ms since the estimate relies
1718          * on two reads of a counter updated every ms.
1719          */
1720         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1721                 dev_dbg_ratelimited(&subs->dev->dev,
1722                         "delay: estimated %d, actual %d\n",
1723                         est_delay, subs->last_delay);
1724
1725         if (!subs->running) {
1726                 /* update last_frame_number for delay counting here since
1727                  * prepare_playback_urb won't be called during pause
1728                  */
1729                 subs->last_frame_number =
1730                         usb_get_current_frame_number(subs->dev) & 0xff;
1731         }
1732
1733  out:
1734         spin_unlock_irqrestore(&subs->lock, flags);
1735 }
1736
1737 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1738                                               int cmd)
1739 {
1740         struct snd_usb_substream *subs = substream->runtime->private_data;
1741
1742         switch (cmd) {
1743         case SNDRV_PCM_TRIGGER_START:
1744                 subs->trigger_tstamp_pending_update = true;
1745                 /* fall through */
1746         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1747                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1748                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1749                 subs->running = 1;
1750                 return 0;
1751         case SNDRV_PCM_TRIGGER_STOP:
1752                 stop_endpoints(subs);
1753                 subs->running = 0;
1754                 return 0;
1755         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1756                 subs->data_endpoint->prepare_data_urb = NULL;
1757                 /* keep retire_data_urb for delay calculation */
1758                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1759                 subs->running = 0;
1760                 return 0;
1761         case SNDRV_PCM_TRIGGER_SUSPEND:
1762                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1763                         stop_endpoints(subs);
1764                         subs->need_setup_fmt = true;
1765                         return 0;
1766                 }
1767                 break;
1768         }
1769
1770         return -EINVAL;
1771 }
1772
1773 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1774                                              int cmd)
1775 {
1776         int err;
1777         struct snd_usb_substream *subs = substream->runtime->private_data;
1778
1779         switch (cmd) {
1780         case SNDRV_PCM_TRIGGER_START:
1781                 err = start_endpoints(subs);
1782                 if (err < 0)
1783                         return err;
1784
1785                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1786                 subs->running = 1;
1787                 return 0;
1788         case SNDRV_PCM_TRIGGER_STOP:
1789                 stop_endpoints(subs);
1790                 subs->data_endpoint->retire_data_urb = NULL;
1791                 subs->running = 0;
1792                 return 0;
1793         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1794                 subs->data_endpoint->retire_data_urb = NULL;
1795                 subs->running = 0;
1796                 return 0;
1797         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1798                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1799                 subs->running = 1;
1800                 return 0;
1801         case SNDRV_PCM_TRIGGER_SUSPEND:
1802                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1803                         stop_endpoints(subs);
1804                         subs->need_setup_fmt = true;
1805                         return 0;
1806                 }
1807                 break;
1808         }
1809
1810         return -EINVAL;
1811 }
1812
1813 static const struct snd_pcm_ops snd_usb_playback_ops = {
1814         .open =         snd_usb_pcm_open,
1815         .close =        snd_usb_pcm_close,
1816         .hw_params =    snd_usb_hw_params,
1817         .hw_free =      snd_usb_hw_free,
1818         .prepare =      snd_usb_pcm_prepare,
1819         .trigger =      snd_usb_substream_playback_trigger,
1820         .sync_stop =    snd_usb_pcm_sync_stop,
1821         .pointer =      snd_usb_pcm_pointer,
1822 };
1823
1824 static const struct snd_pcm_ops snd_usb_capture_ops = {
1825         .open =         snd_usb_pcm_open,
1826         .close =        snd_usb_pcm_close,
1827         .hw_params =    snd_usb_hw_params,
1828         .hw_free =      snd_usb_hw_free,
1829         .prepare =      snd_usb_pcm_prepare,
1830         .trigger =      snd_usb_substream_capture_trigger,
1831         .sync_stop =    snd_usb_pcm_sync_stop,
1832         .pointer =      snd_usb_pcm_pointer,
1833 };
1834
1835 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1836 {
1837         const struct snd_pcm_ops *ops;
1838
1839         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1840                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1841         snd_pcm_set_ops(pcm, stream, ops);
1842 }
1843
1844 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1845 {
1846         struct snd_pcm *pcm = subs->stream->pcm;
1847         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1848         struct device *dev = subs->dev->bus->controller;
1849
1850         if (snd_usb_use_vmalloc)
1851                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1852                                            NULL, 0, 0);
1853         else
1854                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1855                                            dev, 64*1024, 512*1024);
1856 }