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/ratelimit.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/audio.h>
  22 #include <linux/usb/audio-v2.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27
  28 #include "usbaudio.h"
  29 #include "card.h"
  30 #include "quirks.h"
  31 #include "debug.h"
  32 #include "endpoint.h"
  33 #include "helper.h"
  34 #include "pcm.h"
  35 #include "clock.h"
  36 #include "power.h"
  37
  38 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  39 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  40
  41 /* return the estimated delay based on USB frame counters */
  42 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  43                                     unsigned int rate)
  44 {
  45         int current_frame_number;
  46         int frame_diff;
  47         int est_delay;
  48
  49         current_frame_number = usb_get_current_frame_number(subs->dev);
  50         /*
  51          * HCD implementations use different widths, use lower 8 bits.
  52          * The delay will be managed up to 256ms, which is more than
  53          * enough
  54          */
  55         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  56
  57         /* Approximation based on number of samples per USB frame (ms),
  58            some truncation for 44.1 but the estimate is good enough */
  59         est_delay =  subs->last_delay - (frame_diff * rate / 1000);
  60         if (est_delay < 0)
  61                 est_delay = 0;
  62         return est_delay;
  63 }
  64
  65 /*
  66  * return the current pcm pointer.  just based on the hwptr_done value.
  67  */
  68 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  69 {
  70         struct snd_usb_substream *subs;
  71         unsigned int hwptr_done;
  72
  73         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  74         spin_lock(&subs->lock);
  75         hwptr_done = subs->hwptr_done;
  76         substream->runtime->delay = snd_usb_pcm_delay(subs,
  77                                                 substream->runtime->rate);
  78         spin_unlock(&subs->lock);
  79         return hwptr_done / (substream->runtime->frame_bits >> 3);
  80 }
  81
  82 /*
  83  * find a matching audio format
  84  */
  85 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  86                                        unsigned int rate, unsigned int channels)
  87 {
  88         struct list_head *p;
  89         struct audioformat *found = NULL;
  90         int cur_attr = 0, attr;
  91
  92         list_for_each(p, &subs->fmt_list) {
  93                 struct audioformat *fp;
  94                 fp = list_entry(p, struct audioformat, list);
  95                 if (!(fp->formats & (1uLL << format)))
  96                         continue;
  97                 if (fp->channels != channels)
  98                         continue;
  99                 if (rate < fp->rate_min || rate > fp->rate_max)
 100                         continue;
 101                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 102                         unsigned int i;
 103                         for (i = 0; i < fp->nr_rates; i++)
 104                                 if (fp->rate_table[i] == rate)
 105                                         break;
 106                         if (i >= fp->nr_rates)
 107                                 continue;
 108                 }
 109                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 110                 if (! found) {
 111                         found = fp;
 112                         cur_attr = attr;
 113                         continue;
 114                 }
 115                 /* avoid async out and adaptive in if the other method
 116                  * supports the same format.
 117                  * this is a workaround for the case like
 118                  * M-audio audiophile USB.
 119                  */
 120                 if (attr != cur_attr) {
 121                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 122                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 123                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 124                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 125                                 continue;
 126                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 127                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 128                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 129                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 130                                 found = fp;
 131                                 cur_attr = attr;
 132                                 continue;
 133                         }
 134                 }
 135                 /* find the format with the largest max. packet size */
 136                 if (fp->maxpacksize > found->maxpacksize) {
 137                         found = fp;
 138                         cur_attr = attr;
 139                 }
 140         }
 141         return found;
 142 }
 143
 144 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 145                          struct usb_host_interface *alts,
 146                          struct audioformat *fmt)
 147 {
 148         struct usb_device *dev = chip->dev;
 149         unsigned int ep;
 150         unsigned char data[1];
 151         int err;
 152
 153         ep = get_endpoint(alts, 0)->bEndpointAddress;
 154
 155         data[0] = 1;
 156         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 157                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 158                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 159                                    data, sizeof(data))) < 0) {
 160                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 161                            dev->devnum, 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         unsigned int ep;
 175         int err;
 176
 177         ep = get_endpoint(alts, 0)->bEndpointAddress;
 178
 179         data[0] = 1;
 180         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 181                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 182                                    UAC2_EP_CS_PITCH << 8, 0,
 183                                    data, sizeof(data))) < 0) {
 184                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 185                            dev->devnum, iface, fmt->altsetting);
 186                 return err;
 187         }
 188
 189         return 0;
 190 }
 191
 192 /*
 193  * initialize the pitch control and sample rate
 194  */
 195 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 196                        struct usb_host_interface *alts,
 197                        struct audioformat *fmt)
 198 {
 199         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 200
 201         /* if endpoint doesn't have pitch control, bail out */
 202         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 203                 return 0;
 204
 205         switch (altsd->bInterfaceProtocol) {
 206         case UAC_VERSION_1:
 207         default:
 208                 return init_pitch_v1(chip, iface, alts, fmt);
 209
 210         case UAC_VERSION_2:
 211                 return init_pitch_v2(chip, iface, alts, fmt);
 212         }
 213 }
 214
 215 static int start_endpoints(struct snd_usb_substream *subs)
 216 {
 217         int err;
 218
 219         if (!subs->data_endpoint)
 220                 return -EINVAL;
 221
 222         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 223                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 224
 225                 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
 226
 227                 ep->data_subs = subs;
 228                 err = snd_usb_endpoint_start(ep);
 229                 if (err < 0) {
 230                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 231                         return err;
 232                 }
 233         }
 234
 235         if (subs->sync_endpoint &&
 236             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 237                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 238
 239                 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
 240
 241                 ep->sync_slave = subs->data_endpoint;
 242                 err = snd_usb_endpoint_start(ep);
 243                 if (err < 0) {
 244                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 245                         return err;
 246                 }
 247         }
 248
 249         return 0;
 250 }
 251
 252 static void stop_endpoints(struct snd_usb_substream *subs,
 253                            int force, int can_sleep, int wait)
 254 {
 255         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 256                 snd_usb_endpoint_stop(subs->sync_endpoint,
 257                                       force, can_sleep, wait);
 258
 259         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 260                 snd_usb_endpoint_stop(subs->data_endpoint,
 261                                       force, can_sleep, wait);
 262 }
 263
 264 static int activate_endpoints(struct snd_usb_substream *subs)
 265 {
 266         if (subs->sync_endpoint) {
 267                 int ret;
 268
 269                 ret = snd_usb_endpoint_activate(subs->sync_endpoint);
 270                 if (ret < 0)
 271                         return ret;
 272         }
 273
 274         return snd_usb_endpoint_activate(subs->data_endpoint);
 275 }
 276
 277 static int deactivate_endpoints(struct snd_usb_substream *subs)
 278 {
 279         int reta, retb;
 280
 281         reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
 282         retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
 283
 284         if (reta < 0)
 285                 return reta;
 286
 287         if (retb < 0)
 288                 return retb;
 289
 290         return 0;
 291 }
 292
 293 /*
 294  * find a matching format and set up the interface
 295  */
 296 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 297 {
 298         struct usb_device *dev = subs->dev;
 299         struct usb_host_interface *alts;
 300         struct usb_interface_descriptor *altsd;
 301         struct usb_interface *iface;
 302         unsigned int ep, attr;
 303         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 304         int err, implicit_fb = 0;
 305
 306         iface = usb_ifnum_to_if(dev, fmt->iface);
 307         if (WARN_ON(!iface))
 308                 return -EINVAL;
 309         alts = &iface->altsetting[fmt->altset_idx];
 310         altsd = get_iface_desc(alts);
 311         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 312                 return -EINVAL;
 313
 314         if (fmt == subs->cur_audiofmt)
 315                 return 0;
 316
 317         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 318                                                    alts, fmt->endpoint, subs->direction,
 319                                                    SND_USB_ENDPOINT_TYPE_DATA);
 320         if (!subs->data_endpoint)
 321                 return -EINVAL;
 322
 323         /* we need a sync pipe in async OUT or adaptive IN mode */
 324         /* check the number of EP, since some devices have broken
 325          * descriptors which fool us.  if it has only one EP,
 326          * assume it as adaptive-out or sync-in.
 327          */
 328         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 329
 330         switch (subs->stream->chip->usb_id) {
 331         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 332         case USB_ID(0x0763, 0x2081):
 333                 if (is_playback) {
 334                         implicit_fb = 1;
 335                         ep = 0x81;
 336                         iface = usb_ifnum_to_if(dev, 2);
 337
 338                         if (!iface || iface->num_altsetting == 0)
 339                                 return -EINVAL;
 340
 341                         alts = &iface->altsetting[1];
 342                         goto add_sync_ep;
 343                 }
 344         }
 345
 346         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 347              (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 348             altsd->bNumEndpoints >= 2) {
 349                 /* check sync-pipe endpoint */
 350                 /* ... and check descriptor size before accessing bSynchAddress
 351                    because there is a version of the SB Audigy 2 NX firmware lacking
 352                    the audio fields in the endpoint descriptors */
 353                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 354                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 355                      get_endpoint(alts, 1)->bSynchAddress != 0 &&
 356                      !implicit_fb)) {
 357                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 358                                    dev->devnum, fmt->iface, fmt->altsetting,
 359                                    get_endpoint(alts, 1)->bmAttributes,
 360                                    get_endpoint(alts, 1)->bLength,
 361                                    get_endpoint(alts, 1)->bSynchAddress);
 362                         return -EINVAL;
 363                 }
 364                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 365                 if (!implicit_fb &&
 366                     get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 367                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 368                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 369                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 370                                    dev->devnum, fmt->iface, fmt->altsetting,
 371                                    is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 372                         return -EINVAL;
 373                 }
 374
 375                 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 376                                 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 377
 378 add_sync_ep:
 379                 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 380                                                            alts, ep, !subs->direction,
 381                                                            implicit_fb ?
 382                                                                 SND_USB_ENDPOINT_TYPE_DATA :
 383                                                                 SND_USB_ENDPOINT_TYPE_SYNC);
 384                 if (!subs->sync_endpoint)
 385                         return -EINVAL;
 386
 387                 subs->data_endpoint->sync_master = subs->sync_endpoint;
 388         }
 389
 390         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 391                 return err;
 392
 393         subs->cur_audiofmt = fmt;
 394
 395         snd_usb_set_format_quirk(subs, fmt);
 396
 397 #if 0
 398         printk(KERN_DEBUG
 399                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 400                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 401         printk(KERN_DEBUG
 402                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 403                subs->datapipe, subs->syncpipe);
 404 #endif
 405
 406         return 0;
 407 }
 408
 409 /*
 410  * hw_params callback
 411  *
 412  * allocate a buffer and set the given audio format.
 413  *
 414  * so far we use a physically linear buffer although packetize transfer
 415  * doesn't need a continuous area.
 416  * if sg buffer is supported on the later version of alsa, we'll follow
 417  * that.
 418  */
 419 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 420                              struct snd_pcm_hw_params *hw_params)
 421 {
 422         struct snd_usb_substream *subs = substream->runtime->private_data;
 423         struct audioformat *fmt;
 424         unsigned int channels, rate, format;
 425         int ret, changed;
 426
 427         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 428                                                params_buffer_bytes(hw_params));
 429         if (ret < 0)
 430                 return ret;
 431
 432         format = params_format(hw_params);
 433         rate = params_rate(hw_params);
 434         channels = params_channels(hw_params);
 435         fmt = find_format(subs, format, rate, channels);
 436         if (!fmt) {
 437                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 438                            format, rate, channels);
 439                 return -EINVAL;
 440         }
 441
 442         changed = subs->cur_audiofmt != fmt ||
 443                 subs->period_bytes != params_period_bytes(hw_params) ||
 444                 subs->cur_rate != rate;
 445         if ((ret = set_format(subs, fmt)) < 0)
 446                 return ret;
 447
 448         if (subs->cur_rate != rate) {
 449                 struct usb_host_interface *alts;
 450                 struct usb_interface *iface;
 451                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 452                 alts = &iface->altsetting[fmt->altset_idx];
 453                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 454                 if (ret < 0)
 455                         return ret;
 456                 subs->cur_rate = rate;
 457         }
 458
 459         if (changed) {
 460                 mutex_lock(&subs->stream->chip->shutdown_mutex);
 461                 /* format changed */
 462                 stop_endpoints(subs, 0, 0, 0);
 463                 deactivate_endpoints(subs);
 464
 465                 ret = activate_endpoints(subs);
 466                 if (ret < 0)
 467                         goto unlock;
 468
 469                 ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
 470                                                   subs->sync_endpoint);
 471                 if (ret < 0)
 472                         goto unlock;
 473
 474                 if (subs->sync_endpoint)
 475                         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 476                                                           hw_params, fmt, NULL);
 477 unlock:
 478                 mutex_unlock(&subs->stream->chip->shutdown_mutex);
 479         }
 480
 481         if (ret == 0) {
 482                 subs->interface = fmt->iface;
 483                 subs->altset_idx = fmt->altset_idx;
 484         }
 485
 486         return ret;
 487 }
 488
 489 /*
 490  * hw_free callback
 491  *
 492  * reset the audio format and release the buffer
 493  */
 494 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 495 {
 496         struct snd_usb_substream *subs = substream->runtime->private_data;
 497
 498         subs->cur_audiofmt = NULL;
 499         subs->cur_rate = 0;
 500         subs->period_bytes = 0;
 501         mutex_lock(&subs->stream->chip->shutdown_mutex);
 502         stop_endpoints(subs, 0, 1, 1);
 503         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 504         return snd_pcm_lib_free_vmalloc_buffer(substream);
 505 }
 506
 507 /*
 508  * prepare callback
 509  *
 510  * only a few subtle things...
 511  */
 512 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 513 {
 514         struct snd_pcm_runtime *runtime = substream->runtime;
 515         struct snd_usb_substream *subs = runtime->private_data;
 516
 517         if (! subs->cur_audiofmt) {
 518                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 519                 return -ENXIO;
 520         }
 521
 522         if (snd_BUG_ON(!subs->data_endpoint))
 523                 return -EIO;
 524
 525         /* some unit conversions in runtime */
 526         subs->data_endpoint->maxframesize =
 527                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 528         subs->data_endpoint->curframesize =
 529                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 530
 531         /* reset the pointer */
 532         subs->hwptr_done = 0;
 533         subs->transfer_done = 0;
 534         subs->last_delay = 0;
 535         subs->last_frame_number = 0;
 536         runtime->delay = 0;
 537
 538         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 539          * updates for all URBs would happen at the same time when starting */
 540         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 541                 return start_endpoints(subs);
 542
 543         return 0;
 544 }
 545
 546 static struct snd_pcm_hardware snd_usb_hardware =
 547 {
 548         .info =                 SNDRV_PCM_INFO_MMAP |
 549                                 SNDRV_PCM_INFO_MMAP_VALID |
 550                                 SNDRV_PCM_INFO_BATCH |
 551                                 SNDRV_PCM_INFO_INTERLEAVED |
 552                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 553                                 SNDRV_PCM_INFO_PAUSE,
 554         .buffer_bytes_max =     1024 * 1024,
 555         .period_bytes_min =     64,
 556         .period_bytes_max =     512 * 1024,
 557         .periods_min =          2,
 558         .periods_max =          1024,
 559 };
 560
 561 static int hw_check_valid_format(struct snd_usb_substream *subs,
 562                                  struct snd_pcm_hw_params *params,
 563                                  struct audioformat *fp)
 564 {
 565         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 566         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 567         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 568         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 569         struct snd_mask check_fmts;
 570         unsigned int ptime;
 571
 572         /* check the format */
 573         snd_mask_none(&check_fmts);
 574         check_fmts.bits[0] = (u32)fp->formats;
 575         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 576         snd_mask_intersect(&check_fmts, fmts);
 577         if (snd_mask_empty(&check_fmts)) {
 578                 hwc_debug("   > check: no supported format %d\n", fp->format);
 579                 return 0;
 580         }
 581         /* check the channels */
 582         if (fp->channels < ct->min || fp->channels > ct->max) {
 583                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 584                 return 0;
 585         }
 586         /* check the rate is within the range */
 587         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 588                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 589                 return 0;
 590         }
 591         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 592                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 593                 return 0;
 594         }
 595         /* check whether the period time is >= the data packet interval */
 596         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 597                 ptime = 125 * (1 << fp->datainterval);
 598                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 599                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 600                         return 0;
 601                 }
 602         }
 603         return 1;
 604 }
 605
 606 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 607                         struct snd_pcm_hw_rule *rule)
 608 {
 609         struct snd_usb_substream *subs = rule->private;
 610         struct list_head *p;
 611         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 612         unsigned int rmin, rmax;
 613         int changed;
 614
 615         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 616         changed = 0;
 617         rmin = rmax = 0;
 618         list_for_each(p, &subs->fmt_list) {
 619                 struct audioformat *fp;
 620                 fp = list_entry(p, struct audioformat, list);
 621                 if (!hw_check_valid_format(subs, params, fp))
 622                         continue;
 623                 if (changed++) {
 624                         if (rmin > fp->rate_min)
 625                                 rmin = fp->rate_min;
 626                         if (rmax < fp->rate_max)
 627                                 rmax = fp->rate_max;
 628                 } else {
 629                         rmin = fp->rate_min;
 630                         rmax = fp->rate_max;
 631                 }
 632         }
 633
 634         if (!changed) {
 635                 hwc_debug("  --> get empty\n");
 636                 it->empty = 1;
 637                 return -EINVAL;
 638         }
 639
 640         changed = 0;
 641         if (it->min < rmin) {
 642                 it->min = rmin;
 643                 it->openmin = 0;
 644                 changed = 1;
 645         }
 646         if (it->max > rmax) {
 647                 it->max = rmax;
 648                 it->openmax = 0;
 649                 changed = 1;
 650         }
 651         if (snd_interval_checkempty(it)) {
 652                 it->empty = 1;
 653                 return -EINVAL;
 654         }
 655         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 656         return changed;
 657 }
 658
 659
 660 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 661                             struct snd_pcm_hw_rule *rule)
 662 {
 663         struct snd_usb_substream *subs = rule->private;
 664         struct list_head *p;
 665         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 666         unsigned int rmin, rmax;
 667         int changed;
 668
 669         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 670         changed = 0;
 671         rmin = rmax = 0;
 672         list_for_each(p, &subs->fmt_list) {
 673                 struct audioformat *fp;
 674                 fp = list_entry(p, struct audioformat, list);
 675                 if (!hw_check_valid_format(subs, params, fp))
 676                         continue;
 677                 if (changed++) {
 678                         if (rmin > fp->channels)
 679                                 rmin = fp->channels;
 680                         if (rmax < fp->channels)
 681                                 rmax = fp->channels;
 682                 } else {
 683                         rmin = fp->channels;
 684                         rmax = fp->channels;
 685                 }
 686         }
 687
 688         if (!changed) {
 689                 hwc_debug("  --> get empty\n");
 690                 it->empty = 1;
 691                 return -EINVAL;
 692         }
 693
 694         changed = 0;
 695         if (it->min < rmin) {
 696                 it->min = rmin;
 697                 it->openmin = 0;
 698                 changed = 1;
 699         }
 700         if (it->max > rmax) {
 701                 it->max = rmax;
 702                 it->openmax = 0;
 703                 changed = 1;
 704         }
 705         if (snd_interval_checkempty(it)) {
 706                 it->empty = 1;
 707                 return -EINVAL;
 708         }
 709         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 710         return changed;
 711 }
 712
 713 static int hw_rule_format(struct snd_pcm_hw_params *params,
 714                           struct snd_pcm_hw_rule *rule)
 715 {
 716         struct snd_usb_substream *subs = rule->private;
 717         struct list_head *p;
 718         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 719         u64 fbits;
 720         u32 oldbits[2];
 721         int changed;
 722
 723         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 724         fbits = 0;
 725         list_for_each(p, &subs->fmt_list) {
 726                 struct audioformat *fp;
 727                 fp = list_entry(p, struct audioformat, list);
 728                 if (!hw_check_valid_format(subs, params, fp))
 729                         continue;
 730                 fbits |= fp->formats;
 731         }
 732
 733         oldbits[0] = fmt->bits[0];
 734         oldbits[1] = fmt->bits[1];
 735         fmt->bits[0] &= (u32)fbits;
 736         fmt->bits[1] &= (u32)(fbits >> 32);
 737         if (!fmt->bits[0] && !fmt->bits[1]) {
 738                 hwc_debug("  --> get empty\n");
 739                 return -EINVAL;
 740         }
 741         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 742         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 743         return changed;
 744 }
 745
 746 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 747                                struct snd_pcm_hw_rule *rule)
 748 {
 749         struct snd_usb_substream *subs = rule->private;
 750         struct audioformat *fp;
 751         struct snd_interval *it;
 752         unsigned char min_datainterval;
 753         unsigned int pmin;
 754         int changed;
 755
 756         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 757         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 758         min_datainterval = 0xff;
 759         list_for_each_entry(fp, &subs->fmt_list, list) {
 760                 if (!hw_check_valid_format(subs, params, fp))
 761                         continue;
 762                 min_datainterval = min(min_datainterval, fp->datainterval);
 763         }
 764         if (min_datainterval == 0xff) {
 765                 hwc_debug("  --> get empty\n");
 766                 it->empty = 1;
 767                 return -EINVAL;
 768         }
 769         pmin = 125 * (1 << min_datainterval);
 770         changed = 0;
 771         if (it->min < pmin) {
 772                 it->min = pmin;
 773                 it->openmin = 0;
 774                 changed = 1;
 775         }
 776         if (snd_interval_checkempty(it)) {
 777                 it->empty = 1;
 778                 return -EINVAL;
 779         }
 780         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 781         return changed;
 782 }
 783
 784 /*
 785  *  If the device supports unusual bit rates, does the request meet these?
 786  */
 787 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 788                                   struct snd_usb_substream *subs)
 789 {
 790         struct audioformat *fp;
 791         int *rate_list;
 792         int count = 0, needs_knot = 0;
 793         int err;
 794
 795         kfree(subs->rate_list.list);
 796         subs->rate_list.list = NULL;
 797
 798         list_for_each_entry(fp, &subs->fmt_list, list) {
 799                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 800                         return 0;
 801                 count += fp->nr_rates;
 802                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 803                         needs_knot = 1;
 804         }
 805         if (!needs_knot)
 806                 return 0;
 807
 808         subs->rate_list.list = rate_list =
 809                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 810         if (!subs->rate_list.list)
 811                 return -ENOMEM;
 812         subs->rate_list.count = count;
 813         subs->rate_list.mask = 0;
 814         count = 0;
 815         list_for_each_entry(fp, &subs->fmt_list, list) {
 816                 int i;
 817                 for (i = 0; i < fp->nr_rates; i++)
 818                         rate_list[count++] = fp->rate_table[i];
 819         }
 820         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 821                                          &subs->rate_list);
 822         if (err < 0)
 823                 return err;
 824
 825         return 0;
 826 }
 827
 828
 829 /*
 830  * set up the runtime hardware information.
 831  */
 832
 833 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 834 {
 835         struct list_head *p;
 836         unsigned int pt, ptmin;
 837         int param_period_time_if_needed;
 838         int err;
 839
 840         runtime->hw.formats = subs->formats;
 841
 842         runtime->hw.rate_min = 0x7fffffff;
 843         runtime->hw.rate_max = 0;
 844         runtime->hw.channels_min = 256;
 845         runtime->hw.channels_max = 0;
 846         runtime->hw.rates = 0;
 847         ptmin = UINT_MAX;
 848         /* check min/max rates and channels */
 849         list_for_each(p, &subs->fmt_list) {
 850                 struct audioformat *fp;
 851                 fp = list_entry(p, struct audioformat, list);
 852                 runtime->hw.rates |= fp->rates;
 853                 if (runtime->hw.rate_min > fp->rate_min)
 854                         runtime->hw.rate_min = fp->rate_min;
 855                 if (runtime->hw.rate_max < fp->rate_max)
 856                         runtime->hw.rate_max = fp->rate_max;
 857                 if (runtime->hw.channels_min > fp->channels)
 858                         runtime->hw.channels_min = fp->channels;
 859                 if (runtime->hw.channels_max < fp->channels)
 860                         runtime->hw.channels_max = fp->channels;
 861                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 862                         /* FIXME: there might be more than one audio formats... */
 863                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 864                                 fp->frame_size;
 865                 }
 866                 pt = 125 * (1 << fp->datainterval);
 867                 ptmin = min(ptmin, pt);
 868         }
 869         err = snd_usb_autoresume(subs->stream->chip);
 870         if (err < 0)
 871                 return err;
 872
 873         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 874         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 875                 /* full speed devices have fixed data packet interval */
 876                 ptmin = 1000;
 877         if (ptmin == 1000)
 878                 /* if period time doesn't go below 1 ms, no rules needed */
 879                 param_period_time_if_needed = -1;
 880         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 881                                      ptmin, UINT_MAX);
 882
 883         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 884                                        hw_rule_rate, subs,
 885                                        SNDRV_PCM_HW_PARAM_FORMAT,
 886                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 887                                        param_period_time_if_needed,
 888                                        -1)) < 0)
 889                 goto rep_err;
 890         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 891                                        hw_rule_channels, subs,
 892                                        SNDRV_PCM_HW_PARAM_FORMAT,
 893                                        SNDRV_PCM_HW_PARAM_RATE,
 894                                        param_period_time_if_needed,
 895                                        -1)) < 0)
 896                 goto rep_err;
 897         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 898                                        hw_rule_format, subs,
 899                                        SNDRV_PCM_HW_PARAM_RATE,
 900                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 901                                        param_period_time_if_needed,
 902                                        -1)) < 0)
 903                 goto rep_err;
 904         if (param_period_time_if_needed >= 0) {
 905                 err = snd_pcm_hw_rule_add(runtime, 0,
 906                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 907                                           hw_rule_period_time, subs,
 908                                           SNDRV_PCM_HW_PARAM_FORMAT,
 909                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 910                                           SNDRV_PCM_HW_PARAM_RATE,
 911                                           -1);
 912                 if (err < 0)
 913                         goto rep_err;
 914         }
 915         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 916                 goto rep_err;
 917         return 0;
 918
 919 rep_err:
 920         snd_usb_autosuspend(subs->stream->chip);
 921         return err;
 922 }
 923
 924 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 925 {
 926         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 927         struct snd_pcm_runtime *runtime = substream->runtime;
 928         struct snd_usb_substream *subs = &as->substream[direction];
 929
 930         subs->interface = -1;
 931         subs->altset_idx = 0;
 932         runtime->hw = snd_usb_hardware;
 933         runtime->private_data = subs;
 934         subs->pcm_substream = substream;
 935         /* runtime PM is also done there */
 936         return setup_hw_info(runtime, subs);
 937 }
 938
 939 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 940 {
 941         int ret;
 942         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 943         struct snd_usb_substream *subs = &as->substream[direction];
 944
 945         stop_endpoints(subs, 0, 0, 0);
 946         ret = deactivate_endpoints(subs);
 947         subs->pcm_substream = NULL;
 948         snd_usb_autosuspend(subs->stream->chip);
 949
 950         return ret;
 951 }
 952
 953 /* Since a URB can handle only a single linear buffer, we must use double
 954  * buffering when the data to be transferred overflows the buffer boundary.
 955  * To avoid inconsistencies when updating hwptr_done, we use double buffering
 956  * for all URBs.
 957  */
 958 static void retire_capture_urb(struct snd_usb_substream *subs,
 959                                struct urb *urb)
 960 {
 961         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
 962         unsigned int stride, frames, bytes, oldptr;
 963         int i, period_elapsed = 0;
 964         unsigned long flags;
 965         unsigned char *cp;
 966
 967         stride = runtime->frame_bits >> 3;
 968
 969         for (i = 0; i < urb->number_of_packets; i++) {
 970                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 971                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
 972                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
 973                         // continue;
 974                 }
 975                 bytes = urb->iso_frame_desc[i].actual_length;
 976                 frames = bytes / stride;
 977                 if (!subs->txfr_quirk)
 978                         bytes = frames * stride;
 979                 if (bytes % (runtime->sample_bits >> 3) != 0) {
 980 #ifdef CONFIG_SND_DEBUG_VERBOSE
 981                         int oldbytes = bytes;
 982 #endif
 983                         bytes = frames * stride;
 984                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
 985                                                         oldbytes, bytes);
 986                 }
 987                 /* update the current pointer */
 988                 spin_lock_irqsave(&subs->lock, flags);
 989                 oldptr = subs->hwptr_done;
 990                 subs->hwptr_done += bytes;
 991                 if (subs->hwptr_done >= runtime->buffer_size * stride)
 992                         subs->hwptr_done -= runtime->buffer_size * stride;
 993                 frames = (bytes + (oldptr % stride)) / stride;
 994                 subs->transfer_done += frames;
 995                 if (subs->transfer_done >= runtime->period_size) {
 996                         subs->transfer_done -= runtime->period_size;
 997                         period_elapsed = 1;
 998                 }
 999                 spin_unlock_irqrestore(&subs->lock, flags);
1000                 /* copy a data chunk */
1001                 if (oldptr + bytes > runtime->buffer_size * stride) {
1002                         unsigned int bytes1 =
1003                                         runtime->buffer_size * stride - oldptr;
1004                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1005                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1006                 } else {
1007                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1008                 }
1009         }
1010
1011         if (period_elapsed)
1012                 snd_pcm_period_elapsed(subs->pcm_substream);
1013 }
1014
1015 static void prepare_playback_urb(struct snd_usb_substream *subs,
1016                                  struct urb *urb)
1017 {
1018         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1019         struct snd_urb_ctx *ctx = urb->context;
1020         unsigned int counts, frames, bytes;
1021         int i, stride, period_elapsed = 0;
1022         unsigned long flags;
1023
1024         stride = runtime->frame_bits >> 3;
1025
1026         frames = 0;
1027         urb->number_of_packets = 0;
1028         spin_lock_irqsave(&subs->lock, flags);
1029         for (i = 0; i < ctx->packets; i++) {
1030                 counts = ctx->packet_size[i];
1031                 /* set up descriptor */
1032                 urb->iso_frame_desc[i].offset = frames * stride;
1033                 urb->iso_frame_desc[i].length = counts * stride;
1034                 frames += counts;
1035                 urb->number_of_packets++;
1036                 subs->transfer_done += counts;
1037                 if (subs->transfer_done >= runtime->period_size) {
1038                         subs->transfer_done -= runtime->period_size;
1039                         period_elapsed = 1;
1040                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1041                                 if (subs->transfer_done > 0) {
1042                                         /* FIXME: fill-max mode is not
1043                                          * supported yet */
1044                                         frames -= subs->transfer_done;
1045                                         counts -= subs->transfer_done;
1046                                         urb->iso_frame_desc[i].length =
1047                                                 counts * stride;
1048                                         subs->transfer_done = 0;
1049                                 }
1050                                 i++;
1051                                 if (i < ctx->packets) {
1052                                         /* add a transfer delimiter */
1053                                         urb->iso_frame_desc[i].offset =
1054                                                 frames * stride;
1055                                         urb->iso_frame_desc[i].length = 0;
1056                                         urb->number_of_packets++;
1057                                 }
1058                                 break;
1059                         }
1060                 }
1061                 if (period_elapsed &&
1062                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1063                         break;
1064         }
1065         bytes = frames * stride;
1066         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1067                 /* err, the transferred area goes over buffer boundary. */
1068                 unsigned int bytes1 =
1069                         runtime->buffer_size * stride - subs->hwptr_done;
1070                 memcpy(urb->transfer_buffer,
1071                        runtime->dma_area + subs->hwptr_done, bytes1);
1072                 memcpy(urb->transfer_buffer + bytes1,
1073                        runtime->dma_area, bytes - bytes1);
1074         } else {
1075                 memcpy(urb->transfer_buffer,
1076                        runtime->dma_area + subs->hwptr_done, bytes);
1077         }
1078         subs->hwptr_done += bytes;
1079         if (subs->hwptr_done >= runtime->buffer_size * stride)
1080                 subs->hwptr_done -= runtime->buffer_size * stride;
1081         runtime->delay += frames;
1082         spin_unlock_irqrestore(&subs->lock, flags);
1083         urb->transfer_buffer_length = bytes;
1084         if (period_elapsed)
1085                 snd_pcm_period_elapsed(subs->pcm_substream);
1086 }
1087
1088 /*
1089  * process after playback data complete
1090  * - decrease the delay count again
1091  */
1092 static void retire_playback_urb(struct snd_usb_substream *subs,
1093                                struct urb *urb)
1094 {
1095         unsigned long flags;
1096         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1097         int stride = runtime->frame_bits >> 3;
1098         int processed = urb->transfer_buffer_length / stride;
1099
1100         spin_lock_irqsave(&subs->lock, flags);
1101         if (processed > runtime->delay)
1102                 runtime->delay = 0;
1103         else
1104                 runtime->delay -= processed;
1105         spin_unlock_irqrestore(&subs->lock, flags);
1106 }
1107
1108 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1109 {
1110         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1111 }
1112
1113 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1114 {
1115         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1116 }
1117
1118 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1119 {
1120         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1121 }
1122
1123 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1124 {
1125         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1126 }
1127
1128 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1129                                               int cmd)
1130 {
1131         struct snd_usb_substream *subs = substream->runtime->private_data;
1132
1133         switch (cmd) {
1134         case SNDRV_PCM_TRIGGER_START:
1135         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1136                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1137                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1138                 subs->running = 1;
1139                 return 0;
1140         case SNDRV_PCM_TRIGGER_STOP:
1141                 stop_endpoints(subs, 0, 0, 0);
1142                 subs->running = 0;
1143                 return 0;
1144         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1145                 subs->data_endpoint->prepare_data_urb = NULL;
1146                 subs->data_endpoint->retire_data_urb = NULL;
1147                 subs->running = 0;
1148                 return 0;
1149         }
1150
1151         return -EINVAL;
1152 }
1153
1154 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1155                                              int cmd)
1156 {
1157         int err;
1158         struct snd_usb_substream *subs = substream->runtime->private_data;
1159
1160         switch (cmd) {
1161         case SNDRV_PCM_TRIGGER_START:
1162                 err = start_endpoints(subs);
1163                 if (err < 0)
1164                         return err;
1165
1166                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1167                 subs->running = 1;
1168                 return 0;
1169         case SNDRV_PCM_TRIGGER_STOP:
1170                 stop_endpoints(subs, 0, 0, 0);
1171                 subs->running = 0;
1172                 return 0;
1173         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1174                 subs->data_endpoint->retire_data_urb = NULL;
1175                 subs->running = 0;
1176                 return 0;
1177         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1178                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1179                 subs->running = 1;
1180                 return 0;
1181         }
1182
1183         return -EINVAL;
1184 }
1185
1186 static struct snd_pcm_ops snd_usb_playback_ops = {
1187         .open =         snd_usb_playback_open,
1188         .close =        snd_usb_playback_close,
1189         .ioctl =        snd_pcm_lib_ioctl,
1190         .hw_params =    snd_usb_hw_params,
1191         .hw_free =      snd_usb_hw_free,
1192         .prepare =      snd_usb_pcm_prepare,
1193         .trigger =      snd_usb_substream_playback_trigger,
1194         .pointer =      snd_usb_pcm_pointer,
1195         .page =         snd_pcm_lib_get_vmalloc_page,
1196         .mmap =         snd_pcm_lib_mmap_vmalloc,
1197 };
1198
1199 static struct snd_pcm_ops snd_usb_capture_ops = {
1200         .open =         snd_usb_capture_open,
1201         .close =        snd_usb_capture_close,
1202         .ioctl =        snd_pcm_lib_ioctl,
1203         .hw_params =    snd_usb_hw_params,
1204         .hw_free =      snd_usb_hw_free,
1205         .prepare =      snd_usb_pcm_prepare,
1206         .trigger =      snd_usb_substream_capture_trigger,
1207         .pointer =      snd_usb_pcm_pointer,
1208         .page =         snd_pcm_lib_get_vmalloc_page,
1209         .mmap =         snd_pcm_lib_mmap_vmalloc,
1210 };
1211
1212 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1213 {
1214         snd_pcm_set_ops(pcm, stream,
1215                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1216                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1217 }