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