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 deactivate_endpoints(struct snd_usb_substream *subs)
 265 {
 266         int reta, retb;
 267
 268         reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
 269         retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
 270
 271         if (reta < 0)
 272                 return reta;
 273
 274         if (retb < 0)
 275                 return retb;
 276
 277         return 0;
 278 }
 279
 280 /*
 281  * find a matching format and set up the interface
 282  */
 283 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 284 {
 285         struct usb_device *dev = subs->dev;
 286         struct usb_host_interface *alts;
 287         struct usb_interface_descriptor *altsd;
 288         struct usb_interface *iface;
 289         unsigned int ep, attr;
 290         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 291         int err, implicit_fb = 0;
 292
 293         iface = usb_ifnum_to_if(dev, fmt->iface);
 294         if (WARN_ON(!iface))
 295                 return -EINVAL;
 296         alts = &iface->altsetting[fmt->altset_idx];
 297         altsd = get_iface_desc(alts);
 298         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 299                 return -EINVAL;
 300
 301         if (fmt == subs->cur_audiofmt)
 302                 return 0;
 303
 304         /* close the old interface */
 305         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 306                 err = usb_set_interface(subs->dev, subs->interface, 0);
 307                 if (err < 0) {
 308                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
 309                                 dev->devnum, fmt->iface, fmt->altsetting, err);
 310                         return -EIO;
 311                 }
 312                 subs->interface = -1;
 313                 subs->altset_idx = 0;
 314         }
 315
 316         /* set interface */
 317         if (subs->interface != fmt->iface ||
 318             subs->altset_idx != fmt->altset_idx) {
 319                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 320                 if (err < 0) {
 321                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
 322                                    dev->devnum, fmt->iface, fmt->altsetting, err);
 323                         return -EIO;
 324                 }
 325                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
 326                                 fmt->iface, fmt->altsetting);
 327                 subs->interface = fmt->iface;
 328                 subs->altset_idx = fmt->altset_idx;
 329         }
 330
 331         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 332                                                    alts, fmt->endpoint, subs->direction,
 333                                                    SND_USB_ENDPOINT_TYPE_DATA);
 334         if (!subs->data_endpoint)
 335                 return -EINVAL;
 336
 337         /* we need a sync pipe in async OUT or adaptive IN mode */
 338         /* check the number of EP, since some devices have broken
 339          * descriptors which fool us.  if it has only one EP,
 340          * assume it as adaptive-out or sync-in.
 341          */
 342         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 343
 344         switch (subs->stream->chip->usb_id) {
 345         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 346         case USB_ID(0x0763, 0x2081):
 347                 if (is_playback) {
 348                         implicit_fb = 1;
 349                         ep = 0x81;
 350                         iface = usb_ifnum_to_if(dev, 2);
 351
 352                         if (!iface || iface->num_altsetting == 0)
 353                                 return -EINVAL;
 354
 355                         alts = &iface->altsetting[1];
 356                         goto add_sync_ep;
 357                 }
 358         }
 359
 360         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 361              (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 362             altsd->bNumEndpoints >= 2) {
 363                 /* check sync-pipe endpoint */
 364                 /* ... and check descriptor size before accessing bSynchAddress
 365                    because there is a version of the SB Audigy 2 NX firmware lacking
 366                    the audio fields in the endpoint descriptors */
 367                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 368                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 369                      get_endpoint(alts, 1)->bSynchAddress != 0 &&
 370                      !implicit_fb)) {
 371                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 372                                    dev->devnum, fmt->iface, fmt->altsetting,
 373                                    get_endpoint(alts, 1)->bmAttributes,
 374                                    get_endpoint(alts, 1)->bLength,
 375                                    get_endpoint(alts, 1)->bSynchAddress);
 376                         return -EINVAL;
 377                 }
 378                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 379                 if (!implicit_fb &&
 380                     get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 381                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 382                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 383                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 384                                    dev->devnum, fmt->iface, fmt->altsetting,
 385                                    is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 386                         return -EINVAL;
 387                 }
 388
 389                 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 390                                 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 391
 392 add_sync_ep:
 393                 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 394                                                            alts, ep, !subs->direction,
 395                                                            implicit_fb ?
 396                                                                 SND_USB_ENDPOINT_TYPE_DATA :
 397                                                                 SND_USB_ENDPOINT_TYPE_SYNC);
 398                 if (!subs->sync_endpoint)
 399                         return -EINVAL;
 400
 401                 subs->data_endpoint->sync_master = subs->sync_endpoint;
 402         }
 403
 404         if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
 405                 return err;
 406
 407         subs->cur_audiofmt = fmt;
 408
 409         snd_usb_set_format_quirk(subs, fmt);
 410
 411 #if 0
 412         printk(KERN_DEBUG
 413                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 414                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 415         printk(KERN_DEBUG
 416                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 417                subs->datapipe, subs->syncpipe);
 418 #endif
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * hw_params callback
 425  *
 426  * allocate a buffer and set the given audio format.
 427  *
 428  * so far we use a physically linear buffer although packetize transfer
 429  * doesn't need a continuous area.
 430  * if sg buffer is supported on the later version of alsa, we'll follow
 431  * that.
 432  */
 433 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 434                              struct snd_pcm_hw_params *hw_params)
 435 {
 436         struct snd_usb_substream *subs = substream->runtime->private_data;
 437         struct audioformat *fmt;
 438         unsigned int channels, rate, format;
 439         int ret, changed;
 440
 441         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 442                                                params_buffer_bytes(hw_params));
 443         if (ret < 0)
 444                 return ret;
 445
 446         format = params_format(hw_params);
 447         rate = params_rate(hw_params);
 448         channels = params_channels(hw_params);
 449         fmt = find_format(subs, format, rate, channels);
 450         if (!fmt) {
 451                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 452                            format, rate, channels);
 453                 return -EINVAL;
 454         }
 455
 456         changed = subs->cur_audiofmt != fmt ||
 457                 subs->period_bytes != params_period_bytes(hw_params) ||
 458                 subs->cur_rate != rate;
 459         if ((ret = set_format(subs, fmt)) < 0)
 460                 return ret;
 461
 462         if (subs->cur_rate != rate) {
 463                 struct usb_host_interface *alts;
 464                 struct usb_interface *iface;
 465                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 466                 alts = &iface->altsetting[fmt->altset_idx];
 467                 ret = snd_usb_init_sample_rate(subs->stream->chip, fmt->iface, alts, fmt, rate);
 468                 if (ret < 0)
 469                         return ret;
 470                 subs->cur_rate = rate;
 471         }
 472
 473         if (changed) {
 474                 mutex_lock(&subs->stream->chip->shutdown_mutex);
 475                 /* format changed */
 476                 stop_endpoints(subs, 0, 0, 0);
 477                 ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
 478                                                   subs->sync_endpoint);
 479                 if (ret < 0)
 480                         goto unlock;
 481
 482                 if (subs->sync_endpoint)
 483                         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 484                                                           hw_params, fmt, NULL);
 485 unlock:
 486                 mutex_unlock(&subs->stream->chip->shutdown_mutex);
 487         }
 488
 489         if (ret == 0) {
 490                 subs->interface = fmt->iface;
 491                 subs->altset_idx = fmt->altset_idx;
 492         }
 493
 494         return ret;
 495 }
 496
 497 /*
 498  * hw_free callback
 499  *
 500  * reset the audio format and release the buffer
 501  */
 502 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 503 {
 504         struct snd_usb_substream *subs = substream->runtime->private_data;
 505
 506         subs->cur_audiofmt = NULL;
 507         subs->cur_rate = 0;
 508         subs->period_bytes = 0;
 509         mutex_lock(&subs->stream->chip->shutdown_mutex);
 510         stop_endpoints(subs, 0, 1, 1);
 511         deactivate_endpoints(subs);
 512         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 513         return snd_pcm_lib_free_vmalloc_buffer(substream);
 514 }
 515
 516 /*
 517  * prepare callback
 518  *
 519  * only a few subtle things...
 520  */
 521 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 522 {
 523         struct snd_pcm_runtime *runtime = substream->runtime;
 524         struct snd_usb_substream *subs = runtime->private_data;
 525
 526         if (! subs->cur_audiofmt) {
 527                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 528                 return -ENXIO;
 529         }
 530
 531         if (snd_BUG_ON(!subs->data_endpoint))
 532                 return -EIO;
 533
 534         /* some unit conversions in runtime */
 535         subs->data_endpoint->maxframesize =
 536                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 537         subs->data_endpoint->curframesize =
 538                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 539
 540         /* reset the pointer */
 541         subs->hwptr_done = 0;
 542         subs->transfer_done = 0;
 543         subs->last_delay = 0;
 544         subs->last_frame_number = 0;
 545         runtime->delay = 0;
 546
 547         /* clear the pending deactivation on the target EPs */
 548         deactivate_endpoints(subs);
 549
 550         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 551          * updates for all URBs would happen at the same time when starting */
 552         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 553                 return start_endpoints(subs);
 554
 555         return 0;
 556 }
 557
 558 static struct snd_pcm_hardware snd_usb_hardware =
 559 {
 560         .info =                 SNDRV_PCM_INFO_MMAP |
 561                                 SNDRV_PCM_INFO_MMAP_VALID |
 562                                 SNDRV_PCM_INFO_BATCH |
 563                                 SNDRV_PCM_INFO_INTERLEAVED |
 564                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 565                                 SNDRV_PCM_INFO_PAUSE,
 566         .buffer_bytes_max =     1024 * 1024,
 567         .period_bytes_min =     64,
 568         .period_bytes_max =     512 * 1024,
 569         .periods_min =          2,
 570         .periods_max =          1024,
 571 };
 572
 573 static int hw_check_valid_format(struct snd_usb_substream *subs,
 574                                  struct snd_pcm_hw_params *params,
 575                                  struct audioformat *fp)
 576 {
 577         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 578         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 579         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 580         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 581         struct snd_mask check_fmts;
 582         unsigned int ptime;
 583
 584         /* check the format */
 585         snd_mask_none(&check_fmts);
 586         check_fmts.bits[0] = (u32)fp->formats;
 587         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 588         snd_mask_intersect(&check_fmts, fmts);
 589         if (snd_mask_empty(&check_fmts)) {
 590                 hwc_debug("   > check: no supported format %d\n", fp->format);
 591                 return 0;
 592         }
 593         /* check the channels */
 594         if (fp->channels < ct->min || fp->channels > ct->max) {
 595                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 596                 return 0;
 597         }
 598         /* check the rate is within the range */
 599         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 600                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 601                 return 0;
 602         }
 603         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 604                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 605                 return 0;
 606         }
 607         /* check whether the period time is >= the data packet interval */
 608         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 609                 ptime = 125 * (1 << fp->datainterval);
 610                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 611                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 612                         return 0;
 613                 }
 614         }
 615         return 1;
 616 }
 617
 618 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 619                         struct snd_pcm_hw_rule *rule)
 620 {
 621         struct snd_usb_substream *subs = rule->private;
 622         struct list_head *p;
 623         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 624         unsigned int rmin, rmax;
 625         int changed;
 626
 627         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 628         changed = 0;
 629         rmin = rmax = 0;
 630         list_for_each(p, &subs->fmt_list) {
 631                 struct audioformat *fp;
 632                 fp = list_entry(p, struct audioformat, list);
 633                 if (!hw_check_valid_format(subs, params, fp))
 634                         continue;
 635                 if (changed++) {
 636                         if (rmin > fp->rate_min)
 637                                 rmin = fp->rate_min;
 638                         if (rmax < fp->rate_max)
 639                                 rmax = fp->rate_max;
 640                 } else {
 641                         rmin = fp->rate_min;
 642                         rmax = fp->rate_max;
 643                 }
 644         }
 645
 646         if (!changed) {
 647                 hwc_debug("  --> get empty\n");
 648                 it->empty = 1;
 649                 return -EINVAL;
 650         }
 651
 652         changed = 0;
 653         if (it->min < rmin) {
 654                 it->min = rmin;
 655                 it->openmin = 0;
 656                 changed = 1;
 657         }
 658         if (it->max > rmax) {
 659                 it->max = rmax;
 660                 it->openmax = 0;
 661                 changed = 1;
 662         }
 663         if (snd_interval_checkempty(it)) {
 664                 it->empty = 1;
 665                 return -EINVAL;
 666         }
 667         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 668         return changed;
 669 }
 670
 671
 672 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 673                             struct snd_pcm_hw_rule *rule)
 674 {
 675         struct snd_usb_substream *subs = rule->private;
 676         struct list_head *p;
 677         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 678         unsigned int rmin, rmax;
 679         int changed;
 680
 681         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 682         changed = 0;
 683         rmin = rmax = 0;
 684         list_for_each(p, &subs->fmt_list) {
 685                 struct audioformat *fp;
 686                 fp = list_entry(p, struct audioformat, list);
 687                 if (!hw_check_valid_format(subs, params, fp))
 688                         continue;
 689                 if (changed++) {
 690                         if (rmin > fp->channels)
 691                                 rmin = fp->channels;
 692                         if (rmax < fp->channels)
 693                                 rmax = fp->channels;
 694                 } else {
 695                         rmin = fp->channels;
 696                         rmax = fp->channels;
 697                 }
 698         }
 699
 700         if (!changed) {
 701                 hwc_debug("  --> get empty\n");
 702                 it->empty = 1;
 703                 return -EINVAL;
 704         }
 705
 706         changed = 0;
 707         if (it->min < rmin) {
 708                 it->min = rmin;
 709                 it->openmin = 0;
 710                 changed = 1;
 711         }
 712         if (it->max > rmax) {
 713                 it->max = rmax;
 714                 it->openmax = 0;
 715                 changed = 1;
 716         }
 717         if (snd_interval_checkempty(it)) {
 718                 it->empty = 1;
 719                 return -EINVAL;
 720         }
 721         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 722         return changed;
 723 }
 724
 725 static int hw_rule_format(struct snd_pcm_hw_params *params,
 726                           struct snd_pcm_hw_rule *rule)
 727 {
 728         struct snd_usb_substream *subs = rule->private;
 729         struct list_head *p;
 730         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 731         u64 fbits;
 732         u32 oldbits[2];
 733         int changed;
 734
 735         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 736         fbits = 0;
 737         list_for_each(p, &subs->fmt_list) {
 738                 struct audioformat *fp;
 739                 fp = list_entry(p, struct audioformat, list);
 740                 if (!hw_check_valid_format(subs, params, fp))
 741                         continue;
 742                 fbits |= fp->formats;
 743         }
 744
 745         oldbits[0] = fmt->bits[0];
 746         oldbits[1] = fmt->bits[1];
 747         fmt->bits[0] &= (u32)fbits;
 748         fmt->bits[1] &= (u32)(fbits >> 32);
 749         if (!fmt->bits[0] && !fmt->bits[1]) {
 750                 hwc_debug("  --> get empty\n");
 751                 return -EINVAL;
 752         }
 753         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 754         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 755         return changed;
 756 }
 757
 758 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 759                                struct snd_pcm_hw_rule *rule)
 760 {
 761         struct snd_usb_substream *subs = rule->private;
 762         struct audioformat *fp;
 763         struct snd_interval *it;
 764         unsigned char min_datainterval;
 765         unsigned int pmin;
 766         int changed;
 767
 768         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 769         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 770         min_datainterval = 0xff;
 771         list_for_each_entry(fp, &subs->fmt_list, list) {
 772                 if (!hw_check_valid_format(subs, params, fp))
 773                         continue;
 774                 min_datainterval = min(min_datainterval, fp->datainterval);
 775         }
 776         if (min_datainterval == 0xff) {
 777                 hwc_debug("  --> get empty\n");
 778                 it->empty = 1;
 779                 return -EINVAL;
 780         }
 781         pmin = 125 * (1 << min_datainterval);
 782         changed = 0;
 783         if (it->min < pmin) {
 784                 it->min = pmin;
 785                 it->openmin = 0;
 786                 changed = 1;
 787         }
 788         if (snd_interval_checkempty(it)) {
 789                 it->empty = 1;
 790                 return -EINVAL;
 791         }
 792         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 793         return changed;
 794 }
 795
 796 /*
 797  *  If the device supports unusual bit rates, does the request meet these?
 798  */
 799 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 800                                   struct snd_usb_substream *subs)
 801 {
 802         struct audioformat *fp;
 803         int *rate_list;
 804         int count = 0, needs_knot = 0;
 805         int err;
 806
 807         kfree(subs->rate_list.list);
 808         subs->rate_list.list = NULL;
 809
 810         list_for_each_entry(fp, &subs->fmt_list, list) {
 811                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 812                         return 0;
 813                 count += fp->nr_rates;
 814                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 815                         needs_knot = 1;
 816         }
 817         if (!needs_knot)
 818                 return 0;
 819
 820         subs->rate_list.list = rate_list =
 821                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 822         if (!subs->rate_list.list)
 823                 return -ENOMEM;
 824         subs->rate_list.count = count;
 825         subs->rate_list.mask = 0;
 826         count = 0;
 827         list_for_each_entry(fp, &subs->fmt_list, list) {
 828                 int i;
 829                 for (i = 0; i < fp->nr_rates; i++)
 830                         rate_list[count++] = fp->rate_table[i];
 831         }
 832         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 833                                          &subs->rate_list);
 834         if (err < 0)
 835                 return err;
 836
 837         return 0;
 838 }
 839
 840
 841 /*
 842  * set up the runtime hardware information.
 843  */
 844
 845 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 846 {
 847         struct list_head *p;
 848         unsigned int pt, ptmin;
 849         int param_period_time_if_needed;
 850         int err;
 851
 852         runtime->hw.formats = subs->formats;
 853
 854         runtime->hw.rate_min = 0x7fffffff;
 855         runtime->hw.rate_max = 0;
 856         runtime->hw.channels_min = 256;
 857         runtime->hw.channels_max = 0;
 858         runtime->hw.rates = 0;
 859         ptmin = UINT_MAX;
 860         /* check min/max rates and channels */
 861         list_for_each(p, &subs->fmt_list) {
 862                 struct audioformat *fp;
 863                 fp = list_entry(p, struct audioformat, list);
 864                 runtime->hw.rates |= fp->rates;
 865                 if (runtime->hw.rate_min > fp->rate_min)
 866                         runtime->hw.rate_min = fp->rate_min;
 867                 if (runtime->hw.rate_max < fp->rate_max)
 868                         runtime->hw.rate_max = fp->rate_max;
 869                 if (runtime->hw.channels_min > fp->channels)
 870                         runtime->hw.channels_min = fp->channels;
 871                 if (runtime->hw.channels_max < fp->channels)
 872                         runtime->hw.channels_max = fp->channels;
 873                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 874                         /* FIXME: there might be more than one audio formats... */
 875                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 876                                 fp->frame_size;
 877                 }
 878                 pt = 125 * (1 << fp->datainterval);
 879                 ptmin = min(ptmin, pt);
 880         }
 881         err = snd_usb_autoresume(subs->stream->chip);
 882         if (err < 0)
 883                 return err;
 884
 885         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 886         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 887                 /* full speed devices have fixed data packet interval */
 888                 ptmin = 1000;
 889         if (ptmin == 1000)
 890                 /* if period time doesn't go below 1 ms, no rules needed */
 891                 param_period_time_if_needed = -1;
 892         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 893                                      ptmin, UINT_MAX);
 894
 895         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 896                                        hw_rule_rate, subs,
 897                                        SNDRV_PCM_HW_PARAM_FORMAT,
 898                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 899                                        param_period_time_if_needed,
 900                                        -1)) < 0)
 901                 goto rep_err;
 902         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 903                                        hw_rule_channels, subs,
 904                                        SNDRV_PCM_HW_PARAM_FORMAT,
 905                                        SNDRV_PCM_HW_PARAM_RATE,
 906                                        param_period_time_if_needed,
 907                                        -1)) < 0)
 908                 goto rep_err;
 909         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 910                                        hw_rule_format, subs,
 911                                        SNDRV_PCM_HW_PARAM_RATE,
 912                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 913                                        param_period_time_if_needed,
 914                                        -1)) < 0)
 915                 goto rep_err;
 916         if (param_period_time_if_needed >= 0) {
 917                 err = snd_pcm_hw_rule_add(runtime, 0,
 918                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 919                                           hw_rule_period_time, subs,
 920                                           SNDRV_PCM_HW_PARAM_FORMAT,
 921                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 922                                           SNDRV_PCM_HW_PARAM_RATE,
 923                                           -1);
 924                 if (err < 0)
 925                         goto rep_err;
 926         }
 927         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 928                 goto rep_err;
 929         return 0;
 930
 931 rep_err:
 932         snd_usb_autosuspend(subs->stream->chip);
 933         return err;
 934 }
 935
 936 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 937 {
 938         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 939         struct snd_pcm_runtime *runtime = substream->runtime;
 940         struct snd_usb_substream *subs = &as->substream[direction];
 941
 942         subs->interface = -1;
 943         subs->altset_idx = 0;
 944         runtime->hw = snd_usb_hardware;
 945         runtime->private_data = subs;
 946         subs->pcm_substream = substream;
 947         /* runtime PM is also done there */
 948         return setup_hw_info(runtime, subs);
 949 }
 950
 951 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 952 {
 953         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 954         struct snd_usb_substream *subs = &as->substream[direction];
 955
 956         stop_endpoints(subs, 0, 0, 0);
 957
 958         if (!as->chip->shutdown && subs->interface >= 0) {
 959                 usb_set_interface(subs->dev, subs->interface, 0);
 960                 subs->interface = -1;
 961         }
 962
 963         subs->pcm_substream = NULL;
 964         snd_usb_autosuspend(subs->stream->chip);
 965
 966         return 0;
 967 }
 968
 969 /* Since a URB can handle only a single linear buffer, we must use double
 970  * buffering when the data to be transferred overflows the buffer boundary.
 971  * To avoid inconsistencies when updating hwptr_done, we use double buffering
 972  * for all URBs.
 973  */
 974 static void retire_capture_urb(struct snd_usb_substream *subs,
 975                                struct urb *urb)
 976 {
 977         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
 978         unsigned int stride, frames, bytes, oldptr;
 979         int i, period_elapsed = 0;
 980         unsigned long flags;
 981         unsigned char *cp;
 982
 983         stride = runtime->frame_bits >> 3;
 984
 985         for (i = 0; i < urb->number_of_packets; i++) {
 986                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 987                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
 988                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
 989                         // continue;
 990                 }
 991                 bytes = urb->iso_frame_desc[i].actual_length;
 992                 frames = bytes / stride;
 993                 if (!subs->txfr_quirk)
 994                         bytes = frames * stride;
 995                 if (bytes % (runtime->sample_bits >> 3) != 0) {
 996 #ifdef CONFIG_SND_DEBUG_VERBOSE
 997                         int oldbytes = bytes;
 998 #endif
 999                         bytes = frames * stride;
1000                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1001                                                         oldbytes, bytes);
1002                 }
1003                 /* update the current pointer */
1004                 spin_lock_irqsave(&subs->lock, flags);
1005                 oldptr = subs->hwptr_done;
1006                 subs->hwptr_done += bytes;
1007                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1008                         subs->hwptr_done -= runtime->buffer_size * stride;
1009                 frames = (bytes + (oldptr % stride)) / stride;
1010                 subs->transfer_done += frames;
1011                 if (subs->transfer_done >= runtime->period_size) {
1012                         subs->transfer_done -= runtime->period_size;
1013                         period_elapsed = 1;
1014                 }
1015                 spin_unlock_irqrestore(&subs->lock, flags);
1016                 /* copy a data chunk */
1017                 if (oldptr + bytes > runtime->buffer_size * stride) {
1018                         unsigned int bytes1 =
1019                                         runtime->buffer_size * stride - oldptr;
1020                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1021                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1022                 } else {
1023                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1024                 }
1025         }
1026
1027         if (period_elapsed)
1028                 snd_pcm_period_elapsed(subs->pcm_substream);
1029 }
1030
1031 static void prepare_playback_urb(struct snd_usb_substream *subs,
1032                                  struct urb *urb)
1033 {
1034         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1035         struct snd_urb_ctx *ctx = urb->context;
1036         unsigned int counts, frames, bytes;
1037         int i, stride, period_elapsed = 0;
1038         unsigned long flags;
1039
1040         stride = runtime->frame_bits >> 3;
1041
1042         frames = 0;
1043         urb->number_of_packets = 0;
1044         spin_lock_irqsave(&subs->lock, flags);
1045         for (i = 0; i < ctx->packets; i++) {
1046                 counts = ctx->packet_size[i];
1047                 /* set up descriptor */
1048                 urb->iso_frame_desc[i].offset = frames * stride;
1049                 urb->iso_frame_desc[i].length = counts * stride;
1050                 frames += counts;
1051                 urb->number_of_packets++;
1052                 subs->transfer_done += counts;
1053                 if (subs->transfer_done >= runtime->period_size) {
1054                         subs->transfer_done -= runtime->period_size;
1055                         period_elapsed = 1;
1056                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1057                                 if (subs->transfer_done > 0) {
1058                                         /* FIXME: fill-max mode is not
1059                                          * supported yet */
1060                                         frames -= subs->transfer_done;
1061                                         counts -= subs->transfer_done;
1062                                         urb->iso_frame_desc[i].length =
1063                                                 counts * stride;
1064                                         subs->transfer_done = 0;
1065                                 }
1066                                 i++;
1067                                 if (i < ctx->packets) {
1068                                         /* add a transfer delimiter */
1069                                         urb->iso_frame_desc[i].offset =
1070                                                 frames * stride;
1071                                         urb->iso_frame_desc[i].length = 0;
1072                                         urb->number_of_packets++;
1073                                 }
1074                                 break;
1075                         }
1076                 }
1077                 if (period_elapsed &&
1078                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1079                         break;
1080         }
1081         bytes = frames * stride;
1082         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1083                 /* err, the transferred area goes over buffer boundary. */
1084                 unsigned int bytes1 =
1085                         runtime->buffer_size * stride - subs->hwptr_done;
1086                 memcpy(urb->transfer_buffer,
1087                        runtime->dma_area + subs->hwptr_done, bytes1);
1088                 memcpy(urb->transfer_buffer + bytes1,
1089                        runtime->dma_area, bytes - bytes1);
1090         } else {
1091                 memcpy(urb->transfer_buffer,
1092                        runtime->dma_area + subs->hwptr_done, bytes);
1093         }
1094         subs->hwptr_done += bytes;
1095         if (subs->hwptr_done >= runtime->buffer_size * stride)
1096                 subs->hwptr_done -= runtime->buffer_size * stride;
1097         runtime->delay += frames;
1098         spin_unlock_irqrestore(&subs->lock, flags);
1099         urb->transfer_buffer_length = bytes;
1100         if (period_elapsed)
1101                 snd_pcm_period_elapsed(subs->pcm_substream);
1102 }
1103
1104 /*
1105  * process after playback data complete
1106  * - decrease the delay count again
1107  */
1108 static void retire_playback_urb(struct snd_usb_substream *subs,
1109                                struct urb *urb)
1110 {
1111         unsigned long flags;
1112         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1113         int stride = runtime->frame_bits >> 3;
1114         int processed = urb->transfer_buffer_length / stride;
1115
1116         spin_lock_irqsave(&subs->lock, flags);
1117         if (processed > runtime->delay)
1118                 runtime->delay = 0;
1119         else
1120                 runtime->delay -= processed;
1121         spin_unlock_irqrestore(&subs->lock, flags);
1122 }
1123
1124 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1125 {
1126         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1127 }
1128
1129 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1130 {
1131         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1132 }
1133
1134 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1135 {
1136         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1137 }
1138
1139 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1140 {
1141         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1142 }
1143
1144 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1145                                               int cmd)
1146 {
1147         struct snd_usb_substream *subs = substream->runtime->private_data;
1148
1149         switch (cmd) {
1150         case SNDRV_PCM_TRIGGER_START:
1151         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1152                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1153                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1154                 subs->running = 1;
1155                 return 0;
1156         case SNDRV_PCM_TRIGGER_STOP:
1157                 stop_endpoints(subs, 0, 0, 0);
1158                 subs->running = 0;
1159                 return 0;
1160         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1161                 subs->data_endpoint->prepare_data_urb = NULL;
1162                 subs->data_endpoint->retire_data_urb = NULL;
1163                 subs->running = 0;
1164                 return 0;
1165         }
1166
1167         return -EINVAL;
1168 }
1169
1170 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1171                                              int cmd)
1172 {
1173         int err;
1174         struct snd_usb_substream *subs = substream->runtime->private_data;
1175
1176         switch (cmd) {
1177         case SNDRV_PCM_TRIGGER_START:
1178                 err = start_endpoints(subs);
1179                 if (err < 0)
1180                         return err;
1181
1182                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1183                 subs->running = 1;
1184                 return 0;
1185         case SNDRV_PCM_TRIGGER_STOP:
1186                 stop_endpoints(subs, 0, 0, 0);
1187                 subs->running = 0;
1188                 return 0;
1189         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1190                 subs->data_endpoint->retire_data_urb = NULL;
1191                 subs->running = 0;
1192                 return 0;
1193         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1194                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1195                 subs->running = 1;
1196                 return 0;
1197         }
1198
1199         return -EINVAL;
1200 }
1201
1202 static struct snd_pcm_ops snd_usb_playback_ops = {
1203         .open =         snd_usb_playback_open,
1204         .close =        snd_usb_playback_close,
1205         .ioctl =        snd_pcm_lib_ioctl,
1206         .hw_params =    snd_usb_hw_params,
1207         .hw_free =      snd_usb_hw_free,
1208         .prepare =      snd_usb_pcm_prepare,
1209         .trigger =      snd_usb_substream_playback_trigger,
1210         .pointer =      snd_usb_pcm_pointer,
1211         .page =         snd_pcm_lib_get_vmalloc_page,
1212         .mmap =         snd_pcm_lib_mmap_vmalloc,
1213 };
1214
1215 static struct snd_pcm_ops snd_usb_capture_ops = {
1216         .open =         snd_usb_capture_open,
1217         .close =        snd_usb_capture_close,
1218         .ioctl =        snd_pcm_lib_ioctl,
1219         .hw_params =    snd_usb_hw_params,
1220         .hw_free =      snd_usb_hw_free,
1221         .prepare =      snd_usb_pcm_prepare,
1222         .trigger =      snd_usb_substream_capture_trigger,
1223         .pointer =      snd_usb_pcm_pointer,
1224         .page =         snd_pcm_lib_get_vmalloc_page,
1225         .mmap =         snd_pcm_lib_mmap_vmalloc,
1226 };
1227
1228 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1229 {
1230         snd_pcm_set_ops(pcm, stream,
1231                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1232                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1233 }