kernel/sound/usb/pcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/bitrev.h>
  20 #include <linux/ratelimit.h>
  21 #include <linux/usb.h>
  22 #include <linux/usb/audio.h>
  23 #include <linux/usb/audio-v2.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28
  29 #include "usbaudio.h"
  30 #include "card.h"
  31 #include "quirks.h"
  32 #include "debug.h"
  33 #include "endpoint.h"
  34 #include "helper.h"
  35 #include "pcm.h"
  36 #include "clock.h"
  37 #include "power.h"
  38
  39 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  40 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  41
  42 /* return the estimated delay based on USB frame counters */
  43 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  44                                     unsigned int rate)
  45 {
  46         int current_frame_number;
  47         int frame_diff;
  48         int est_delay;
  49
  50         if (!subs->last_delay)
  51                 return 0; /* short path */
  52
  53         current_frame_number = usb_get_current_frame_number(subs->dev);
  54         /*
  55          * HCD implementations use different widths, use lower 8 bits.
  56          * The delay will be managed up to 256ms, which is more than
  57          * enough
  58          */
  59         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  60
  61         /* Approximation based on number of samples per USB frame (ms),
  62            some truncation for 44.1 but the estimate is good enough */
  63         est_delay =  frame_diff * rate / 1000;
  64         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  65                 est_delay = subs->last_delay - est_delay;
  66         else
  67                 est_delay = subs->last_delay + est_delay;
  68
  69         if (est_delay < 0)
  70                 est_delay = 0;
  71         return est_delay;
  72 }
  73
  74 /*
  75  * return the current pcm pointer.  just based on the hwptr_done value.
  76  */
  77 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  78 {
  79         struct snd_usb_substream *subs;
  80         unsigned int hwptr_done;
  81
  82         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  83         if (subs->stream->chip->shutdown)
  84                 return SNDRV_PCM_POS_XRUN;
  85         spin_lock(&subs->lock);
  86         hwptr_done = subs->hwptr_done;
  87         substream->runtime->delay = snd_usb_pcm_delay(subs,
  88                                                 substream->runtime->rate);
  89         spin_unlock(&subs->lock);
  90         return hwptr_done / (substream->runtime->frame_bits >> 3);
  91 }
  92
  93 /*
  94  * find a matching audio format
  95  */
  96 static struct audioformat *find_format(struct snd_usb_substream *subs)
  97 {
  98         struct audioformat *fp;
  99         struct audioformat *found = NULL;
 100         int cur_attr = 0, attr;
 101
 102         list_for_each_entry(fp, &subs->fmt_list, list) {
 103                 if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
 104                         continue;
 105                 if (fp->channels != subs->channels)
 106                         continue;
 107                 if (subs->cur_rate < fp->rate_min ||
 108                     subs->cur_rate > fp->rate_max)
 109                         continue;
 110                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 111                         unsigned int i;
 112                         for (i = 0; i < fp->nr_rates; i++)
 113                                 if (fp->rate_table[i] == subs->cur_rate)
 114                                         break;
 115                         if (i >= fp->nr_rates)
 116                                 continue;
 117                 }
 118                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 119                 if (! found) {
 120                         found = fp;
 121                         cur_attr = attr;
 122                         continue;
 123                 }
 124                 /* avoid async out and adaptive in if the other method
 125                  * supports the same format.
 126                  * this is a workaround for the case like
 127                  * M-audio audiophile USB.
 128                  */
 129                 if (attr != cur_attr) {
 130                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 131                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 132                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 133                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 134                                 continue;
 135                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 136                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 137                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 138                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 139                                 found = fp;
 140                                 cur_attr = attr;
 141                                 continue;
 142                         }
 143                 }
 144                 /* find the format with the largest max. packet size */
 145                 if (fp->maxpacksize > found->maxpacksize) {
 146                         found = fp;
 147                         cur_attr = attr;
 148                 }
 149         }
 150         return found;
 151 }
 152
 153 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 154                          struct usb_host_interface *alts,
 155                          struct audioformat *fmt)
 156 {
 157         struct usb_device *dev = chip->dev;
 158         unsigned int ep;
 159         unsigned char data[1];
 160         int err;
 161
 162         ep = get_endpoint(alts, 0)->bEndpointAddress;
 163
 164         data[0] = 1;
 165         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 166                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 167                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 168                                    data, sizeof(data))) < 0) {
 169                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 170                               iface, ep);
 171                 return err;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 178                          struct usb_host_interface *alts,
 179                          struct audioformat *fmt)
 180 {
 181         struct usb_device *dev = chip->dev;
 182         unsigned char data[1];
 183         int err;
 184
 185         data[0] = 1;
 186         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 187                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 188                                    UAC2_EP_CS_PITCH << 8, 0,
 189                                    data, sizeof(data))) < 0) {
 190                 usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 191                               iface, fmt->altsetting);
 192                 return err;
 193         }
 194
 195         return 0;
 196 }
 197
 198 /*
 199  * initialize the pitch control and sample rate
 200  */
 201 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 202                        struct usb_host_interface *alts,
 203                        struct audioformat *fmt)
 204 {
 205         /* if endpoint doesn't have pitch control, bail out */
 206         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 207                 return 0;
 208
 209         switch (fmt->protocol) {
 210         case UAC_VERSION_1:
 211         default:
 212                 return init_pitch_v1(chip, iface, alts, fmt);
 213
 214         case UAC_VERSION_2:
 215                 return init_pitch_v2(chip, iface, alts, fmt);
 216         }
 217 }
 218
 219 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
 220 {
 221         int err;
 222
 223         if (!subs->data_endpoint)
 224                 return -EINVAL;
 225
 226         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 227                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 228
 229                 dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 230
 231                 ep->data_subs = subs;
 232                 err = snd_usb_endpoint_start(ep, can_sleep);
 233                 if (err < 0) {
 234                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 235                         return err;
 236                 }
 237         }
 238
 239         if (subs->sync_endpoint &&
 240             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 241                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 242
 243                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 244                     subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 245                         err = usb_set_interface(subs->dev,
 246                                                 subs->sync_endpoint->iface,
 247                                                 subs->sync_endpoint->altsetting);
 248                         if (err < 0) {
 249                                 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 250                                 dev_err(&subs->dev->dev,
 251                                            "%d:%d: cannot set interface (%d)\n",
 252                                            subs->sync_endpoint->iface,
 253                                            subs->sync_endpoint->altsetting, err);
 254                                 return -EIO;
 255                         }
 256                 }
 257
 258                 dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 259
 260                 ep->sync_slave = subs->data_endpoint;
 261                 err = snd_usb_endpoint_start(ep, can_sleep);
 262                 if (err < 0) {
 263                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 264                         return err;
 265                 }
 266         }
 267
 268         return 0;
 269 }
 270
 271 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 272 {
 273         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 274                 snd_usb_endpoint_stop(subs->sync_endpoint);
 275
 276         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 277                 snd_usb_endpoint_stop(subs->data_endpoint);
 278
 279         if (wait) {
 280                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 281                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 282         }
 283 }
 284
 285 static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 286                                      unsigned int altsetting,
 287                                      struct usb_host_interface **alts,
 288                                      unsigned int *ep)
 289 {
 290         struct usb_interface *iface;
 291         struct usb_interface_descriptor *altsd;
 292         struct usb_endpoint_descriptor *epd;
 293
 294         iface = usb_ifnum_to_if(dev, ifnum);
 295         if (!iface || iface->num_altsetting < altsetting + 1)
 296                 return -ENOENT;
 297         *alts = &iface->altsetting[altsetting];
 298         altsd = get_iface_desc(*alts);
 299         if (altsd->bAlternateSetting != altsetting ||
 300             altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 301             (altsd->bInterfaceSubClass != 2 &&
 302              altsd->bInterfaceProtocol != 2   ) ||
 303             altsd->bNumEndpoints < 1)
 304                 return -ENOENT;
 305         epd = get_endpoint(*alts, 0);
 306         if (!usb_endpoint_is_isoc_in(epd) ||
 307             (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 308                                         USB_ENDPOINT_USAGE_IMPLICIT_FB)
 309                 return -ENOENT;
 310         *ep = epd->bEndpointAddress;
 311         return 0;
 312 }
 313
 314 static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 315                                          struct usb_device *dev,
 316                                          struct usb_interface_descriptor *altsd,
 317                                          unsigned int attr)
 318 {
 319         struct usb_host_interface *alts;
 320         struct usb_interface *iface;
 321         unsigned int ep;
 322
 323         /* Implicit feedback sync EPs consumers are always playback EPs */
 324         if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 325                 return 0;
 326
 327         switch (subs->stream->chip->usb_id) {
 328         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 329         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 330                 ep = 0x81;
 331                 iface = usb_ifnum_to_if(dev, 3);
 332
 333                 if (!iface || iface->num_altsetting == 0)
 334                         return -EINVAL;
 335
 336                 alts = &iface->altsetting[1];
 337                 goto add_sync_ep;
 338                 break;
 339         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 340         case USB_ID(0x0763, 0x2081):
 341                 ep = 0x81;
 342                 iface = usb_ifnum_to_if(dev, 2);
 343
 344                 if (!iface || iface->num_altsetting == 0)
 345                         return -EINVAL;
 346
 347                 alts = &iface->altsetting[1];
 348                 goto add_sync_ep;
 349         }
 350         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 351             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 352             altsd->bInterfaceProtocol == 2 &&
 353             altsd->bNumEndpoints == 1 &&
 354             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 355             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 356                                       altsd->bAlternateSetting,
 357                                       &alts, &ep) >= 0) {
 358                 goto add_sync_ep;
 359         }
 360
 361         /* No quirk */
 362         return 0;
 363
 364 add_sync_ep:
 365         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 366                                                    alts, ep, !subs->direction,
 367                                                    SND_USB_ENDPOINT_TYPE_DATA);
 368         if (!subs->sync_endpoint)
 369                 return -EINVAL;
 370
 371         subs->data_endpoint->sync_master = subs->sync_endpoint;
 372
 373         return 0;
 374 }
 375
 376 static int set_sync_endpoint(struct snd_usb_substream *subs,
 377                              struct audioformat *fmt,
 378                              struct usb_device *dev,
 379                              struct usb_host_interface *alts,
 380                              struct usb_interface_descriptor *altsd)
 381 {
 382         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 383         unsigned int ep, attr;
 384         bool implicit_fb;
 385         int err;
 386
 387         /* we need a sync pipe in async OUT or adaptive IN mode */
 388         /* check the number of EP, since some devices have broken
 389          * descriptors which fool us.  if it has only one EP,
 390          * assume it as adaptive-out or sync-in.
 391          */
 392         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 393
 394         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 395         if (err < 0)
 396                 return err;
 397
 398         if (altsd->bNumEndpoints < 2)
 399                 return 0;
 400
 401         if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) ||
 402             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 403                 return 0;
 404
 405         /* check sync-pipe endpoint */
 406         /* ... and check descriptor size before accessing bSynchAddress
 407            because there is a version of the SB Audigy 2 NX firmware lacking
 408            the audio fields in the endpoint descriptors */
 409         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 410             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 411              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 412                 dev_err(&dev->dev,
 413                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 414                            fmt->iface, fmt->altsetting,
 415                            get_endpoint(alts, 1)->bmAttributes,
 416                            get_endpoint(alts, 1)->bLength,
 417                            get_endpoint(alts, 1)->bSynchAddress);
 418                 return -EINVAL;
 419         }
 420         ep = get_endpoint(alts, 1)->bEndpointAddress;
 421         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 422             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 423              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 424                 dev_err(&dev->dev,
 425                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 426                            fmt->iface, fmt->altsetting,
 427                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 428                 return -EINVAL;
 429         }
 430
 431         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 432                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 433
 434         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 435                                                    alts, ep, !subs->direction,
 436                                                    implicit_fb ?
 437                                                         SND_USB_ENDPOINT_TYPE_DATA :
 438                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 439         if (!subs->sync_endpoint)
 440                 return -EINVAL;
 441
 442         subs->data_endpoint->sync_master = subs->sync_endpoint;
 443
 444         return 0;
 445 }
 446
 447 /*
 448  * find a matching format and set up the interface
 449  */
 450 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 451 {
 452         struct usb_device *dev = subs->dev;
 453         struct usb_host_interface *alts;
 454         struct usb_interface_descriptor *altsd;
 455         struct usb_interface *iface;
 456         int err;
 457
 458         iface = usb_ifnum_to_if(dev, fmt->iface);
 459         if (WARN_ON(!iface))
 460                 return -EINVAL;
 461         alts = &iface->altsetting[fmt->altset_idx];
 462         altsd = get_iface_desc(alts);
 463         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 464                 return -EINVAL;
 465
 466         if (fmt == subs->cur_audiofmt)
 467                 return 0;
 468
 469         /* close the old interface */
 470         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 471                 err = usb_set_interface(subs->dev, subs->interface, 0);
 472                 if (err < 0) {
 473                         dev_err(&dev->dev,
 474                                 "%d:%d: return to setting 0 failed (%d)\n",
 475                                 fmt->iface, fmt->altsetting, err);
 476                         return -EIO;
 477                 }
 478                 subs->interface = -1;
 479                 subs->altset_idx = 0;
 480         }
 481
 482         /* set interface */
 483         if (subs->interface != fmt->iface ||
 484             subs->altset_idx != fmt->altset_idx) {
 485
 486                 err = snd_usb_select_mode_quirk(subs, fmt);
 487                 if (err < 0)
 488                         return -EIO;
 489
 490                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 491                 if (err < 0) {
 492                         dev_err(&dev->dev,
 493                                 "%d:%d: usb_set_interface failed (%d)\n",
 494                                 fmt->iface, fmt->altsetting, err);
 495                         return -EIO;
 496                 }
 497                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 498                         fmt->iface, fmt->altsetting);
 499                 subs->interface = fmt->iface;
 500                 subs->altset_idx = fmt->altset_idx;
 501
 502                 snd_usb_set_interface_quirk(dev);
 503         }
 504
 505         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 506                                                    alts, fmt->endpoint, subs->direction,
 507                                                    SND_USB_ENDPOINT_TYPE_DATA);
 508
 509         if (!subs->data_endpoint)
 510                 return -EINVAL;
 511
 512         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 513         if (err < 0)
 514                 return err;
 515
 516         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 517         if (err < 0)
 518                 return err;
 519
 520         subs->cur_audiofmt = fmt;
 521
 522         snd_usb_set_format_quirk(subs, fmt);
 523
 524         return 0;
 525 }
 526
 527 /*
 528  * Return the score of matching two audioformats.
 529  * Veto the audioformat if:
 530  * - It has no channels for some reason.
 531  * - Requested PCM format is not supported.
 532  * - Requested sample rate is not supported.
 533  */
 534 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 535                                        struct audioformat *fp,
 536                                        struct audioformat *match, int rate,
 537                                        snd_pcm_format_t pcm_format)
 538 {
 539         int i;
 540         int score = 0;
 541
 542         if (fp->channels < 1) {
 543                 dev_dbg(&subs->dev->dev,
 544                         "%s: (fmt @%p) no channels\n", __func__, fp);
 545                 return 0;
 546         }
 547
 548         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 549                 dev_dbg(&subs->dev->dev,
 550                         "%s: (fmt @%p) no match for format %d\n", __func__,
 551                         fp, pcm_format);
 552                 return 0;
 553         }
 554
 555         for (i = 0; i < fp->nr_rates; i++) {
 556                 if (fp->rate_table[i] == rate) {
 557                         score++;
 558                         break;
 559                 }
 560         }
 561         if (!score) {
 562                 dev_dbg(&subs->dev->dev,
 563                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 564                         fp, rate);
 565                 return 0;
 566         }
 567
 568         if (fp->channels == match->channels)
 569                 score++;
 570
 571         dev_dbg(&subs->dev->dev,
 572                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 573
 574         return score;
 575 }
 576
 577 /*
 578  * Configure the sync ep using the rate and pcm format of the data ep.
 579  */
 580 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 581 {
 582         int ret;
 583         struct audioformat *fp;
 584         struct audioformat *sync_fp = NULL;
 585         int cur_score = 0;
 586         int sync_period_bytes = subs->period_bytes;
 587         struct snd_usb_substream *sync_subs =
 588                 &subs->stream->substream[subs->direction ^ 1];
 589
 590         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 591             !subs->stream)
 592                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 593                                                    subs->pcm_format,
 594                                                    subs->channels,
 595                                                    subs->period_bytes,
 596                                                    0, 0,
 597                                                    subs->cur_rate,
 598                                                    subs->cur_audiofmt,
 599                                                    NULL);
 600
 601         /* Try to find the best matching audioformat. */
 602         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 603                 int score = match_endpoint_audioformats(subs,
 604                                                         fp, subs->cur_audiofmt,
 605                         subs->cur_rate, subs->pcm_format);
 606
 607                 if (score > cur_score) {
 608                         sync_fp = fp;
 609                         cur_score = score;
 610                 }
 611         }
 612
 613         if (unlikely(sync_fp == NULL)) {
 614                 dev_err(&subs->dev->dev,
 615                         "%s: no valid audioformat for sync ep %x found\n",
 616                         __func__, sync_subs->ep_num);
 617                 return -EINVAL;
 618         }
 619
 620         /*
 621          * Recalculate the period bytes if channel number differ between
 622          * data and sync ep audioformat.
 623          */
 624         if (sync_fp->channels != subs->channels) {
 625                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 626                         sync_fp->channels;
 627                 dev_dbg(&subs->dev->dev,
 628                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 629                         __func__, subs->period_bytes, sync_period_bytes);
 630         }
 631
 632         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 633                                           subs->pcm_format,
 634                                           sync_fp->channels,
 635                                           sync_period_bytes,
 636                                           0, 0,
 637                                           subs->cur_rate,
 638                                           sync_fp,
 639                                           NULL);
 640
 641         return ret;
 642 }
 643
 644 /*
 645  * configure endpoint params
 646  *
 647  * called  during initial setup and upon resume
 648  */
 649 static int configure_endpoint(struct snd_usb_substream *subs)
 650 {
 651         int ret;
 652
 653         /* format changed */
 654         stop_endpoints(subs, true);
 655         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 656                                           subs->pcm_format,
 657                                           subs->channels,
 658                                           subs->period_bytes,
 659                                           subs->period_frames,
 660                                           subs->buffer_periods,
 661                                           subs->cur_rate,
 662                                           subs->cur_audiofmt,
 663                                           subs->sync_endpoint);
 664         if (ret < 0)
 665                 return ret;
 666
 667         if (subs->sync_endpoint)
 668                 ret = configure_sync_endpoint(subs);
 669
 670         return ret;
 671 }
 672
 673 /*
 674  * hw_params callback
 675  *
 676  * allocate a buffer and set the given audio format.
 677  *
 678  * so far we use a physically linear buffer although packetize transfer
 679  * doesn't need a continuous area.
 680  * if sg buffer is supported on the later version of alsa, we'll follow
 681  * that.
 682  */
 683 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 684                              struct snd_pcm_hw_params *hw_params)
 685 {
 686         struct snd_usb_substream *subs = substream->runtime->private_data;
 687         struct audioformat *fmt;
 688         int ret;
 689
 690         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 691                                                params_buffer_bytes(hw_params));
 692         if (ret < 0)
 693                 return ret;
 694
 695         subs->pcm_format = params_format(hw_params);
 696         subs->period_bytes = params_period_bytes(hw_params);
 697         subs->period_frames = params_period_size(hw_params);
 698         subs->buffer_periods = params_periods(hw_params);
 699         subs->channels = params_channels(hw_params);
 700         subs->cur_rate = params_rate(hw_params);
 701
 702         fmt = find_format(subs);
 703         if (!fmt) {
 704                 dev_dbg(&subs->dev->dev,
 705                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 706                            subs->pcm_format, subs->cur_rate, subs->channels);
 707                 return -EINVAL;
 708         }
 709
 710         down_read(&subs->stream->chip->shutdown_rwsem);
 711         if (subs->stream->chip->shutdown)
 712                 ret = -ENODEV;
 713         else
 714                 ret = set_format(subs, fmt);
 715         up_read(&subs->stream->chip->shutdown_rwsem);
 716         if (ret < 0)
 717                 return ret;
 718
 719         subs->interface = fmt->iface;
 720         subs->altset_idx = fmt->altset_idx;
 721         subs->need_setup_ep = true;
 722
 723         return 0;
 724 }
 725
 726 /*
 727  * hw_free callback
 728  *
 729  * reset the audio format and release the buffer
 730  */
 731 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 732 {
 733         struct snd_usb_substream *subs = substream->runtime->private_data;
 734
 735         subs->cur_audiofmt = NULL;
 736         subs->cur_rate = 0;
 737         subs->period_bytes = 0;
 738         down_read(&subs->stream->chip->shutdown_rwsem);
 739         if (!subs->stream->chip->shutdown) {
 740                 stop_endpoints(subs, true);
 741                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 742                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 743         }
 744         up_read(&subs->stream->chip->shutdown_rwsem);
 745         return snd_pcm_lib_free_vmalloc_buffer(substream);
 746 }
 747
 748 /*
 749  * prepare callback
 750  *
 751  * only a few subtle things...
 752  */
 753 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 754 {
 755         struct snd_pcm_runtime *runtime = substream->runtime;
 756         struct snd_usb_substream *subs = runtime->private_data;
 757         struct usb_host_interface *alts;
 758         struct usb_interface *iface;
 759         int ret;
 760
 761         if (! subs->cur_audiofmt) {
 762                 dev_err(&subs->dev->dev, "no format is specified!\n");
 763                 return -ENXIO;
 764         }
 765
 766         down_read(&subs->stream->chip->shutdown_rwsem);
 767         if (subs->stream->chip->shutdown) {
 768                 ret = -ENODEV;
 769                 goto unlock;
 770         }
 771         if (snd_BUG_ON(!subs->data_endpoint)) {
 772                 ret = -EIO;
 773                 goto unlock;
 774         }
 775
 776         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 777         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 778
 779         ret = set_format(subs, subs->cur_audiofmt);
 780         if (ret < 0)
 781                 goto unlock;
 782
 783         iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 784         alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 785         ret = snd_usb_init_sample_rate(subs->stream->chip,
 786                                        subs->cur_audiofmt->iface,
 787                                        alts,
 788                                        subs->cur_audiofmt,
 789                                        subs->cur_rate);
 790         if (ret < 0)
 791                 goto unlock;
 792
 793         if (subs->need_setup_ep) {
 794                 ret = configure_endpoint(subs);
 795                 if (ret < 0)
 796                         goto unlock;
 797                 subs->need_setup_ep = false;
 798         }
 799
 800         /* some unit conversions in runtime */
 801         subs->data_endpoint->maxframesize =
 802                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 803         subs->data_endpoint->curframesize =
 804                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 805
 806         /* reset the pointer */
 807         subs->hwptr_done = 0;
 808         subs->transfer_done = 0;
 809         subs->last_delay = 0;
 810         subs->last_frame_number = 0;
 811         runtime->delay = 0;
 812
 813         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 814          * updates for all URBs would happen at the same time when starting */
 815         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 816                 ret = start_endpoints(subs, true);
 817
 818  unlock:
 819         up_read(&subs->stream->chip->shutdown_rwsem);
 820         return ret;
 821 }
 822
 823 static struct snd_pcm_hardware snd_usb_hardware =
 824 {
 825         .info =                 SNDRV_PCM_INFO_MMAP |
 826                                 SNDRV_PCM_INFO_MMAP_VALID |
 827                                 SNDRV_PCM_INFO_BATCH |
 828                                 SNDRV_PCM_INFO_INTERLEAVED |
 829                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 830                                 SNDRV_PCM_INFO_PAUSE,
 831         .buffer_bytes_max =     1024 * 1024,
 832         .period_bytes_min =     64,
 833         .period_bytes_max =     512 * 1024,
 834         .periods_min =          2,
 835         .periods_max =          1024,
 836 };
 837
 838 static int hw_check_valid_format(struct snd_usb_substream *subs,
 839                                  struct snd_pcm_hw_params *params,
 840                                  struct audioformat *fp)
 841 {
 842         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 843         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 844         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 845         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 846         struct snd_mask check_fmts;
 847         unsigned int ptime;
 848
 849         /* check the format */
 850         snd_mask_none(&check_fmts);
 851         check_fmts.bits[0] = (u32)fp->formats;
 852         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 853         snd_mask_intersect(&check_fmts, fmts);
 854         if (snd_mask_empty(&check_fmts)) {
 855                 hwc_debug("   > check: no supported format %d\n", fp->format);
 856                 return 0;
 857         }
 858         /* check the channels */
 859         if (fp->channels < ct->min || fp->channels > ct->max) {
 860                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 861                 return 0;
 862         }
 863         /* check the rate is within the range */
 864         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 865                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 866                 return 0;
 867         }
 868         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 869                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 870                 return 0;
 871         }
 872         /* check whether the period time is >= the data packet interval */
 873         if (subs->speed != USB_SPEED_FULL) {
 874                 ptime = 125 * (1 << fp->datainterval);
 875                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 876                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 877                         return 0;
 878                 }
 879         }
 880         return 1;
 881 }
 882
 883 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 884                         struct snd_pcm_hw_rule *rule)
 885 {
 886         struct snd_usb_substream *subs = rule->private;
 887         struct audioformat *fp;
 888         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 889         unsigned int rmin, rmax;
 890         int changed;
 891
 892         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 893         changed = 0;
 894         rmin = rmax = 0;
 895         list_for_each_entry(fp, &subs->fmt_list, list) {
 896                 if (!hw_check_valid_format(subs, params, fp))
 897                         continue;
 898                 if (changed++) {
 899                         if (rmin > fp->rate_min)
 900                                 rmin = fp->rate_min;
 901                         if (rmax < fp->rate_max)
 902                                 rmax = fp->rate_max;
 903                 } else {
 904                         rmin = fp->rate_min;
 905                         rmax = fp->rate_max;
 906                 }
 907         }
 908
 909         if (!changed) {
 910                 hwc_debug("  --> get empty\n");
 911                 it->empty = 1;
 912                 return -EINVAL;
 913         }
 914
 915         changed = 0;
 916         if (it->min < rmin) {
 917                 it->min = rmin;
 918                 it->openmin = 0;
 919                 changed = 1;
 920         }
 921         if (it->max > rmax) {
 922                 it->max = rmax;
 923                 it->openmax = 0;
 924                 changed = 1;
 925         }
 926         if (snd_interval_checkempty(it)) {
 927                 it->empty = 1;
 928                 return -EINVAL;
 929         }
 930         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 931         return changed;
 932 }
 933
 934
 935 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 936                             struct snd_pcm_hw_rule *rule)
 937 {
 938         struct snd_usb_substream *subs = rule->private;
 939         struct audioformat *fp;
 940         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 941         unsigned int rmin, rmax;
 942         int changed;
 943
 944         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 945         changed = 0;
 946         rmin = rmax = 0;
 947         list_for_each_entry(fp, &subs->fmt_list, list) {
 948                 if (!hw_check_valid_format(subs, params, fp))
 949                         continue;
 950                 if (changed++) {
 951                         if (rmin > fp->channels)
 952                                 rmin = fp->channels;
 953                         if (rmax < fp->channels)
 954                                 rmax = fp->channels;
 955                 } else {
 956                         rmin = fp->channels;
 957                         rmax = fp->channels;
 958                 }
 959         }
 960
 961         if (!changed) {
 962                 hwc_debug("  --> get empty\n");
 963                 it->empty = 1;
 964                 return -EINVAL;
 965         }
 966
 967         changed = 0;
 968         if (it->min < rmin) {
 969                 it->min = rmin;
 970                 it->openmin = 0;
 971                 changed = 1;
 972         }
 973         if (it->max > rmax) {
 974                 it->max = rmax;
 975                 it->openmax = 0;
 976                 changed = 1;
 977         }
 978         if (snd_interval_checkempty(it)) {
 979                 it->empty = 1;
 980                 return -EINVAL;
 981         }
 982         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 983         return changed;
 984 }
 985
 986 static int hw_rule_format(struct snd_pcm_hw_params *params,
 987                           struct snd_pcm_hw_rule *rule)
 988 {
 989         struct snd_usb_substream *subs = rule->private;
 990         struct audioformat *fp;
 991         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 992         u64 fbits;
 993         u32 oldbits[2];
 994         int changed;
 995
 996         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 997         fbits = 0;
 998         list_for_each_entry(fp, &subs->fmt_list, list) {
 999                 if (!hw_check_valid_format(subs, params, fp))
1000                         continue;
1001                 fbits |= fp->formats;
1002         }
1003
1004         oldbits[0] = fmt->bits[0];
1005         oldbits[1] = fmt->bits[1];
1006         fmt->bits[0] &= (u32)fbits;
1007         fmt->bits[1] &= (u32)(fbits >> 32);
1008         if (!fmt->bits[0] && !fmt->bits[1]) {
1009                 hwc_debug("  --> get empty\n");
1010                 return -EINVAL;
1011         }
1012         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1013         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1014         return changed;
1015 }
1016
1017 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1018                                struct snd_pcm_hw_rule *rule)
1019 {
1020         struct snd_usb_substream *subs = rule->private;
1021         struct audioformat *fp;
1022         struct snd_interval *it;
1023         unsigned char min_datainterval;
1024         unsigned int pmin;
1025         int changed;
1026
1027         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1028         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1029         min_datainterval = 0xff;
1030         list_for_each_entry(fp, &subs->fmt_list, list) {
1031                 if (!hw_check_valid_format(subs, params, fp))
1032                         continue;
1033                 min_datainterval = min(min_datainterval, fp->datainterval);
1034         }
1035         if (min_datainterval == 0xff) {
1036                 hwc_debug("  --> get empty\n");
1037                 it->empty = 1;
1038                 return -EINVAL;
1039         }
1040         pmin = 125 * (1 << min_datainterval);
1041         changed = 0;
1042         if (it->min < pmin) {
1043                 it->min = pmin;
1044                 it->openmin = 0;
1045                 changed = 1;
1046         }
1047         if (snd_interval_checkempty(it)) {
1048                 it->empty = 1;
1049                 return -EINVAL;
1050         }
1051         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1052         return changed;
1053 }
1054
1055 /*
1056  *  If the device supports unusual bit rates, does the request meet these?
1057  */
1058 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1059                                   struct snd_usb_substream *subs)
1060 {
1061         struct audioformat *fp;
1062         int *rate_list;
1063         int count = 0, needs_knot = 0;
1064         int err;
1065
1066         kfree(subs->rate_list.list);
1067         subs->rate_list.list = NULL;
1068
1069         list_for_each_entry(fp, &subs->fmt_list, list) {
1070                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1071                         return 0;
1072                 count += fp->nr_rates;
1073                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1074                         needs_knot = 1;
1075         }
1076         if (!needs_knot)
1077                 return 0;
1078
1079         subs->rate_list.list = rate_list =
1080                 kmalloc(sizeof(int) * count, GFP_KERNEL);
1081         if (!subs->rate_list.list)
1082                 return -ENOMEM;
1083         subs->rate_list.count = count;
1084         subs->rate_list.mask = 0;
1085         count = 0;
1086         list_for_each_entry(fp, &subs->fmt_list, list) {
1087                 int i;
1088                 for (i = 0; i < fp->nr_rates; i++)
1089                         rate_list[count++] = fp->rate_table[i];
1090         }
1091         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1092                                          &subs->rate_list);
1093         if (err < 0)
1094                 return err;
1095
1096         return 0;
1097 }
1098
1099
1100 /*
1101  * set up the runtime hardware information.
1102  */
1103
1104 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1105 {
1106         struct audioformat *fp;
1107         unsigned int pt, ptmin;
1108         int param_period_time_if_needed;
1109         int err;
1110
1111         runtime->hw.formats = subs->formats;
1112
1113         runtime->hw.rate_min = 0x7fffffff;
1114         runtime->hw.rate_max = 0;
1115         runtime->hw.channels_min = 256;
1116         runtime->hw.channels_max = 0;
1117         runtime->hw.rates = 0;
1118         ptmin = UINT_MAX;
1119         /* check min/max rates and channels */
1120         list_for_each_entry(fp, &subs->fmt_list, list) {
1121                 runtime->hw.rates |= fp->rates;
1122                 if (runtime->hw.rate_min > fp->rate_min)
1123                         runtime->hw.rate_min = fp->rate_min;
1124                 if (runtime->hw.rate_max < fp->rate_max)
1125                         runtime->hw.rate_max = fp->rate_max;
1126                 if (runtime->hw.channels_min > fp->channels)
1127                         runtime->hw.channels_min = fp->channels;
1128                 if (runtime->hw.channels_max < fp->channels)
1129                         runtime->hw.channels_max = fp->channels;
1130                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1131                         /* FIXME: there might be more than one audio formats... */
1132                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1133                                 fp->frame_size;
1134                 }
1135                 pt = 125 * (1 << fp->datainterval);
1136                 ptmin = min(ptmin, pt);
1137         }
1138         err = snd_usb_autoresume(subs->stream->chip);
1139         if (err < 0)
1140                 return err;
1141
1142         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1143         if (subs->speed == USB_SPEED_FULL)
1144                 /* full speed devices have fixed data packet interval */
1145                 ptmin = 1000;
1146         if (ptmin == 1000)
1147                 /* if period time doesn't go below 1 ms, no rules needed */
1148                 param_period_time_if_needed = -1;
1149         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1150                                      ptmin, UINT_MAX);
1151
1152         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1153                                        hw_rule_rate, subs,
1154                                        SNDRV_PCM_HW_PARAM_FORMAT,
1155                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1156                                        param_period_time_if_needed,
1157                                        -1)) < 0)
1158                 goto rep_err;
1159         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1160                                        hw_rule_channels, subs,
1161                                        SNDRV_PCM_HW_PARAM_FORMAT,
1162                                        SNDRV_PCM_HW_PARAM_RATE,
1163                                        param_period_time_if_needed,
1164                                        -1)) < 0)
1165                 goto rep_err;
1166         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1167                                        hw_rule_format, subs,
1168                                        SNDRV_PCM_HW_PARAM_RATE,
1169                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1170                                        param_period_time_if_needed,
1171                                        -1)) < 0)
1172                 goto rep_err;
1173         if (param_period_time_if_needed >= 0) {
1174                 err = snd_pcm_hw_rule_add(runtime, 0,
1175                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1176                                           hw_rule_period_time, subs,
1177                                           SNDRV_PCM_HW_PARAM_FORMAT,
1178                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1179                                           SNDRV_PCM_HW_PARAM_RATE,
1180                                           -1);
1181                 if (err < 0)
1182                         goto rep_err;
1183         }
1184         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1185                 goto rep_err;
1186         return 0;
1187
1188 rep_err:
1189         snd_usb_autosuspend(subs->stream->chip);
1190         return err;
1191 }
1192
1193 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1194 {
1195         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1196         struct snd_pcm_runtime *runtime = substream->runtime;
1197         struct snd_usb_substream *subs = &as->substream[direction];
1198
1199         subs->interface = -1;
1200         subs->altset_idx = 0;
1201         runtime->hw = snd_usb_hardware;
1202         runtime->private_data = subs;
1203         subs->pcm_substream = substream;
1204         /* runtime PM is also done there */
1205
1206         /* initialize DSD/DOP context */
1207         subs->dsd_dop.byte_idx = 0;
1208         subs->dsd_dop.channel = 0;
1209         subs->dsd_dop.marker = 1;
1210
1211         return setup_hw_info(runtime, subs);
1212 }
1213
1214 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1215 {
1216         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1217         struct snd_usb_substream *subs = &as->substream[direction];
1218
1219         stop_endpoints(subs, true);
1220
1221         if (!as->chip->shutdown && subs->interface >= 0) {
1222                 usb_set_interface(subs->dev, subs->interface, 0);
1223                 subs->interface = -1;
1224         }
1225
1226         subs->pcm_substream = NULL;
1227         snd_usb_autosuspend(subs->stream->chip);
1228
1229         return 0;
1230 }
1231
1232 /* Since a URB can handle only a single linear buffer, we must use double
1233  * buffering when the data to be transferred overflows the buffer boundary.
1234  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1235  * for all URBs.
1236  */
1237 static void retire_capture_urb(struct snd_usb_substream *subs,
1238                                struct urb *urb)
1239 {
1240         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1241         unsigned int stride, frames, bytes, oldptr;
1242         int i, period_elapsed = 0;
1243         unsigned long flags;
1244         unsigned char *cp;
1245         int current_frame_number;
1246
1247         /* read frame number here, update pointer in critical section */
1248         current_frame_number = usb_get_current_frame_number(subs->dev);
1249
1250         stride = runtime->frame_bits >> 3;
1251
1252         for (i = 0; i < urb->number_of_packets; i++) {
1253                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1254                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1255                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1256                                 i, urb->iso_frame_desc[i].status);
1257                         // continue;
1258                 }
1259                 bytes = urb->iso_frame_desc[i].actual_length;
1260                 frames = bytes / stride;
1261                 if (!subs->txfr_quirk)
1262                         bytes = frames * stride;
1263                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1264                         int oldbytes = bytes;
1265                         bytes = frames * stride;
1266                         dev_warn(&subs->dev->dev,
1267                                  "Corrected urb data len. %d->%d\n",
1268                                                         oldbytes, bytes);
1269                 }
1270                 /* update the current pointer */
1271                 spin_lock_irqsave(&subs->lock, flags);
1272                 oldptr = subs->hwptr_done;
1273                 subs->hwptr_done += bytes;
1274                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1275                         subs->hwptr_done -= runtime->buffer_size * stride;
1276                 frames = (bytes + (oldptr % stride)) / stride;
1277                 subs->transfer_done += frames;
1278                 if (subs->transfer_done >= runtime->period_size) {
1279                         subs->transfer_done -= runtime->period_size;
1280                         period_elapsed = 1;
1281                 }
1282                 /* capture delay is by construction limited to one URB,
1283                  * reset delays here
1284                  */
1285                 runtime->delay = subs->last_delay = 0;
1286
1287                 /* realign last_frame_number */
1288                 subs->last_frame_number = current_frame_number;
1289                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1290
1291                 spin_unlock_irqrestore(&subs->lock, flags);
1292                 /* copy a data chunk */
1293                 if (oldptr + bytes > runtime->buffer_size * stride) {
1294                         unsigned int bytes1 =
1295                                         runtime->buffer_size * stride - oldptr;
1296                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1297                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1298                 } else {
1299                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1300                 }
1301         }
1302
1303         if (period_elapsed)
1304                 snd_pcm_period_elapsed(subs->pcm_substream);
1305 }
1306
1307 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1308                                              struct urb *urb, unsigned int bytes)
1309 {
1310         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1311         unsigned int stride = runtime->frame_bits >> 3;
1312         unsigned int dst_idx = 0;
1313         unsigned int src_idx = subs->hwptr_done;
1314         unsigned int wrap = runtime->buffer_size * stride;
1315         u8 *dst = urb->transfer_buffer;
1316         u8 *src = runtime->dma_area;
1317         u8 marker[] = { 0x05, 0xfa };
1318
1319         /*
1320          * The DSP DOP format defines a way to transport DSD samples over
1321          * normal PCM data endpoints. It requires stuffing of marker bytes
1322          * (0x05 and 0xfa, alternating per sample frame), and then expects
1323          * 2 additional bytes of actual payload. The whole frame is stored
1324          * LSB.
1325          *
1326          * Hence, for a stereo transport, the buffer layout looks like this,
1327          * where L refers to left channel samples and R to right.
1328          *
1329          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1330          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1331          *   .....
1332          *
1333          */
1334
1335         while (bytes--) {
1336                 if (++subs->dsd_dop.byte_idx == 3) {
1337                         /* frame boundary? */
1338                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1339                         src_idx += 2;
1340                         subs->dsd_dop.byte_idx = 0;
1341
1342                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1343                                 /* alternate the marker */
1344                                 subs->dsd_dop.marker++;
1345                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1346                                 subs->dsd_dop.channel = 0;
1347                         }
1348                 } else {
1349                         /* stuff the DSD payload */
1350                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1351
1352                         if (subs->cur_audiofmt->dsd_bitrev)
1353                                 dst[dst_idx++] = bitrev8(src[idx]);
1354                         else
1355                                 dst[dst_idx++] = src[idx];
1356
1357                         subs->hwptr_done++;
1358                 }
1359         }
1360 }
1361
1362 static void prepare_playback_urb(struct snd_usb_substream *subs,
1363                                  struct urb *urb)
1364 {
1365         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1366         struct snd_usb_endpoint *ep = subs->data_endpoint;
1367         struct snd_urb_ctx *ctx = urb->context;
1368         unsigned int counts, frames, bytes;
1369         int i, stride, period_elapsed = 0;
1370         unsigned long flags;
1371
1372         stride = runtime->frame_bits >> 3;
1373
1374         frames = 0;
1375         urb->number_of_packets = 0;
1376         spin_lock_irqsave(&subs->lock, flags);
1377         subs->frame_limit += ep->max_urb_frames;
1378         for (i = 0; i < ctx->packets; i++) {
1379                 if (ctx->packet_size[i])
1380                         counts = ctx->packet_size[i];
1381                 else
1382                         counts = snd_usb_endpoint_next_packet_size(ep);
1383
1384                 /* set up descriptor */
1385                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1386                 urb->iso_frame_desc[i].length = counts * ep->stride;
1387                 frames += counts;
1388                 urb->number_of_packets++;
1389                 subs->transfer_done += counts;
1390                 if (subs->transfer_done >= runtime->period_size) {
1391                         subs->transfer_done -= runtime->period_size;
1392                         subs->frame_limit = 0;
1393                         period_elapsed = 1;
1394                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1395                                 if (subs->transfer_done > 0) {
1396                                         /* FIXME: fill-max mode is not
1397                                          * supported yet */
1398                                         frames -= subs->transfer_done;
1399                                         counts -= subs->transfer_done;
1400                                         urb->iso_frame_desc[i].length =
1401                                                 counts * ep->stride;
1402                                         subs->transfer_done = 0;
1403                                 }
1404                                 i++;
1405                                 if (i < ctx->packets) {
1406                                         /* add a transfer delimiter */
1407                                         urb->iso_frame_desc[i].offset =
1408                                                 frames * ep->stride;
1409                                         urb->iso_frame_desc[i].length = 0;
1410                                         urb->number_of_packets++;
1411                                 }
1412                                 break;
1413                         }
1414                 }
1415                 /* finish at the period boundary or after enough frames */
1416                 if ((period_elapsed ||
1417                                 subs->transfer_done >= subs->frame_limit) &&
1418                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1419                         break;
1420         }
1421         bytes = frames * ep->stride;
1422
1423         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1424                      subs->cur_audiofmt->dsd_dop)) {
1425                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1426         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1427                            subs->cur_audiofmt->dsd_bitrev)) {
1428                 /* bit-reverse the bytes */
1429                 u8 *buf = urb->transfer_buffer;
1430                 for (i = 0; i < bytes; i++) {
1431                         int idx = (subs->hwptr_done + i)
1432                                 % (runtime->buffer_size * stride);
1433                         buf[i] = bitrev8(runtime->dma_area[idx]);
1434                 }
1435
1436                 subs->hwptr_done += bytes;
1437         } else {
1438                 /* usual PCM */
1439                 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1440                         /* err, the transferred area goes over buffer boundary. */
1441                         unsigned int bytes1 =
1442                                 runtime->buffer_size * stride - subs->hwptr_done;
1443                         memcpy(urb->transfer_buffer,
1444                                runtime->dma_area + subs->hwptr_done, bytes1);
1445                         memcpy(urb->transfer_buffer + bytes1,
1446                                runtime->dma_area, bytes - bytes1);
1447                 } else {
1448                         memcpy(urb->transfer_buffer,
1449                                runtime->dma_area + subs->hwptr_done, bytes);
1450                 }
1451
1452                 subs->hwptr_done += bytes;
1453         }
1454
1455         if (subs->hwptr_done >= runtime->buffer_size * stride)
1456                 subs->hwptr_done -= runtime->buffer_size * stride;
1457
1458         /* update delay with exact number of samples queued */
1459         runtime->delay = subs->last_delay;
1460         runtime->delay += frames;
1461         subs->last_delay = runtime->delay;
1462
1463         /* realign last_frame_number */
1464         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1465         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1466
1467         if (subs->trigger_tstamp_pending_update) {
1468                 /* this is the first actual URB submitted,
1469                  * update trigger timestamp to reflect actual start time
1470                  */
1471                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1472                 subs->trigger_tstamp_pending_update = false;
1473         }
1474
1475         spin_unlock_irqrestore(&subs->lock, flags);
1476         urb->transfer_buffer_length = bytes;
1477         if (period_elapsed)
1478                 snd_pcm_period_elapsed(subs->pcm_substream);
1479 }
1480
1481 /*
1482  * process after playback data complete
1483  * - decrease the delay count again
1484  */
1485 static void retire_playback_urb(struct snd_usb_substream *subs,
1486                                struct urb *urb)
1487 {
1488         unsigned long flags;
1489         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1490         struct snd_usb_endpoint *ep = subs->data_endpoint;
1491         int processed = urb->transfer_buffer_length / ep->stride;
1492         int est_delay;
1493
1494         /* ignore the delay accounting when procssed=0 is given, i.e.
1495          * silent payloads are procssed before handling the actual data
1496          */
1497         if (!processed)
1498                 return;
1499
1500         spin_lock_irqsave(&subs->lock, flags);
1501         if (!subs->last_delay)
1502                 goto out; /* short path */
1503
1504         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1505         /* update delay with exact number of samples played */
1506         if (processed > subs->last_delay)
1507                 subs->last_delay = 0;
1508         else
1509                 subs->last_delay -= processed;
1510         runtime->delay = subs->last_delay;
1511
1512         /*
1513          * Report when delay estimate is off by more than 2ms.
1514          * The error should be lower than 2ms since the estimate relies
1515          * on two reads of a counter updated every ms.
1516          */
1517         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1518                 dev_dbg_ratelimited(&subs->dev->dev,
1519                         "delay: estimated %d, actual %d\n",
1520                         est_delay, subs->last_delay);
1521
1522         if (!subs->running) {
1523                 /* update last_frame_number for delay counting here since
1524                  * prepare_playback_urb won't be called during pause
1525                  */
1526                 subs->last_frame_number =
1527                         usb_get_current_frame_number(subs->dev) & 0xff;
1528         }
1529
1530  out:
1531         spin_unlock_irqrestore(&subs->lock, flags);
1532 }
1533
1534 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1535 {
1536         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1537 }
1538
1539 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1540 {
1541         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1542 }
1543
1544 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1545 {
1546         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1547 }
1548
1549 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1550 {
1551         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1552 }
1553
1554 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1555                                               int cmd)
1556 {
1557         struct snd_usb_substream *subs = substream->runtime->private_data;
1558
1559         switch (cmd) {
1560         case SNDRV_PCM_TRIGGER_START:
1561                 subs->trigger_tstamp_pending_update = true;
1562         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1563                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1564                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1565                 subs->running = 1;
1566                 return 0;
1567         case SNDRV_PCM_TRIGGER_STOP:
1568                 stop_endpoints(subs, false);
1569                 subs->running = 0;
1570                 return 0;
1571         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1572                 subs->data_endpoint->prepare_data_urb = NULL;
1573                 /* keep retire_data_urb for delay calculation */
1574                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1575                 subs->running = 0;
1576                 return 0;
1577         }
1578
1579         return -EINVAL;
1580 }
1581
1582 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1583                                              int cmd)
1584 {
1585         int err;
1586         struct snd_usb_substream *subs = substream->runtime->private_data;
1587
1588         switch (cmd) {
1589         case SNDRV_PCM_TRIGGER_START:
1590                 err = start_endpoints(subs, false);
1591                 if (err < 0)
1592                         return err;
1593
1594                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1595                 subs->running = 1;
1596                 return 0;
1597         case SNDRV_PCM_TRIGGER_STOP:
1598                 stop_endpoints(subs, false);
1599                 subs->running = 0;
1600                 return 0;
1601         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1602                 subs->data_endpoint->retire_data_urb = NULL;
1603                 subs->running = 0;
1604                 return 0;
1605         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1606                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1607                 subs->running = 1;
1608                 return 0;
1609         }
1610
1611         return -EINVAL;
1612 }
1613
1614 static struct snd_pcm_ops snd_usb_playback_ops = {
1615         .open =         snd_usb_playback_open,
1616         .close =        snd_usb_playback_close,
1617         .ioctl =        snd_pcm_lib_ioctl,
1618         .hw_params =    snd_usb_hw_params,
1619         .hw_free =      snd_usb_hw_free,
1620         .prepare =      snd_usb_pcm_prepare,
1621         .trigger =      snd_usb_substream_playback_trigger,
1622         .pointer =      snd_usb_pcm_pointer,
1623         .page =         snd_pcm_lib_get_vmalloc_page,
1624         .mmap =         snd_pcm_lib_mmap_vmalloc,
1625 };
1626
1627 static struct snd_pcm_ops snd_usb_capture_ops = {
1628         .open =         snd_usb_capture_open,
1629         .close =        snd_usb_capture_close,
1630         .ioctl =        snd_pcm_lib_ioctl,
1631         .hw_params =    snd_usb_hw_params,
1632         .hw_free =      snd_usb_hw_free,
1633         .prepare =      snd_usb_pcm_prepare,
1634         .trigger =      snd_usb_substream_capture_trigger,
1635         .pointer =      snd_usb_pcm_pointer,
1636         .page =         snd_pcm_lib_get_vmalloc_page,
1637         .mmap =         snd_pcm_lib_mmap_vmalloc,
1638 };
1639
1640 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1641 {
1642         snd_pcm_set_ops(pcm, stream,
1643                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1644                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1645 }