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, int can_sleep)
 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, can_sleep);
 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                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 240                     subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
 241                         err = usb_set_interface(subs->dev,
 242                                                 subs->sync_endpoint->iface,
 243                                                 subs->sync_endpoint->alt_idx);
 244                         if (err < 0) {
 245                                 snd_printk(KERN_ERR
 246                                            "%d:%d:%d: cannot set interface (%d)\n",
 247                                            subs->dev->devnum,
 248                                            subs->sync_endpoint->iface,
 249                                            subs->sync_endpoint->alt_idx, err);
 250                                 return -EIO;
 251                         }
 252                 }
 253
 254                 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
 255
 256                 ep->sync_slave = subs->data_endpoint;
 257                 err = snd_usb_endpoint_start(ep, can_sleep);
 258                 if (err < 0) {
 259                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 260                         return err;
 261                 }
 262         }
 263
 264         return 0;
 265 }
 266
 267 static void stop_endpoints(struct snd_usb_substream *subs,
 268                            int force, int can_sleep, int wait)
 269 {
 270         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 271                 snd_usb_endpoint_stop(subs->sync_endpoint,
 272                                       force, can_sleep, wait);
 273
 274         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 275                 snd_usb_endpoint_stop(subs->data_endpoint,
 276                                       force, can_sleep, wait);
 277 }
 278
 279 static int deactivate_endpoints(struct snd_usb_substream *subs)
 280 {
 281         int reta, retb;
 282
 283         reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
 284         retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
 285
 286         if (reta < 0)
 287                 return reta;
 288
 289         if (retb < 0)
 290                 return retb;
 291
 292         return 0;
 293 }
 294
 295 /*
 296  * find a matching format and set up the interface
 297  */
 298 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 299 {
 300         struct usb_device *dev = subs->dev;
 301         struct usb_host_interface *alts;
 302         struct usb_interface_descriptor *altsd;
 303         struct usb_interface *iface;
 304         unsigned int ep, attr;
 305         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 306         int err, implicit_fb = 0;
 307
 308         iface = usb_ifnum_to_if(dev, fmt->iface);
 309         if (WARN_ON(!iface))
 310                 return -EINVAL;
 311         alts = &iface->altsetting[fmt->altset_idx];
 312         altsd = get_iface_desc(alts);
 313         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 314                 return -EINVAL;
 315
 316         if (fmt == subs->cur_audiofmt)
 317                 return 0;
 318
 319         /* close the old interface */
 320         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 321                 err = usb_set_interface(subs->dev, subs->interface, 0);
 322                 if (err < 0) {
 323                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
 324                                 dev->devnum, fmt->iface, fmt->altsetting, err);
 325                         return -EIO;
 326                 }
 327                 subs->interface = -1;
 328                 subs->altset_idx = 0;
 329         }
 330
 331         /* set interface */
 332         if (subs->interface != fmt->iface ||
 333             subs->altset_idx != fmt->altset_idx) {
 334                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 335                 if (err < 0) {
 336                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
 337                                    dev->devnum, fmt->iface, fmt->altsetting, err);
 338                         return -EIO;
 339                 }
 340                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
 341                                 fmt->iface, fmt->altsetting);
 342                 subs->interface = fmt->iface;
 343                 subs->altset_idx = fmt->altset_idx;
 344         }
 345
 346         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 347                                                    alts, fmt->endpoint, subs->direction,
 348                                                    SND_USB_ENDPOINT_TYPE_DATA);
 349         if (!subs->data_endpoint)
 350                 return -EINVAL;
 351
 352         /* we need a sync pipe in async OUT or adaptive IN mode */
 353         /* check the number of EP, since some devices have broken
 354          * descriptors which fool us.  if it has only one EP,
 355          * assume it as adaptive-out or sync-in.
 356          */
 357         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 358
 359         switch (subs->stream->chip->usb_id) {
 360         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 361         case USB_ID(0x0763, 0x2081):
 362                 if (is_playback) {
 363                         implicit_fb = 1;
 364                         ep = 0x81;
 365                         iface = usb_ifnum_to_if(dev, 2);
 366
 367                         if (!iface || iface->num_altsetting == 0)
 368                                 return -EINVAL;
 369
 370                         alts = &iface->altsetting[1];
 371                         goto add_sync_ep;
 372                 }
 373         }
 374
 375         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 376              (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 377             altsd->bNumEndpoints >= 2) {
 378                 /* check sync-pipe endpoint */
 379                 /* ... and check descriptor size before accessing bSynchAddress
 380                    because there is a version of the SB Audigy 2 NX firmware lacking
 381                    the audio fields in the endpoint descriptors */
 382                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 383                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 384                      get_endpoint(alts, 1)->bSynchAddress != 0 &&
 385                      !implicit_fb)) {
 386                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 387                                    dev->devnum, fmt->iface, fmt->altsetting,
 388                                    get_endpoint(alts, 1)->bmAttributes,
 389                                    get_endpoint(alts, 1)->bLength,
 390                                    get_endpoint(alts, 1)->bSynchAddress);
 391                         return -EINVAL;
 392                 }
 393                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 394                 if (!implicit_fb &&
 395                     get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 396                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 397                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 398                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 399                                    dev->devnum, fmt->iface, fmt->altsetting,
 400                                    is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 401                         return -EINVAL;
 402                 }
 403
 404                 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 405                                 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 406
 407 add_sync_ep:
 408                 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 409                                                            alts, ep, !subs->direction,
 410                                                            implicit_fb ?
 411                                                                 SND_USB_ENDPOINT_TYPE_DATA :
 412                                                                 SND_USB_ENDPOINT_TYPE_SYNC);
 413                 if (!subs->sync_endpoint)
 414                         return -EINVAL;
 415
 416                 subs->data_endpoint->sync_master = subs->sync_endpoint;
 417         }
 418
 419         if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
 420                 return err;
 421
 422         subs->cur_audiofmt = fmt;
 423
 424         snd_usb_set_format_quirk(subs, fmt);
 425
 426 #if 0
 427         printk(KERN_DEBUG
 428                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 429                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 430         printk(KERN_DEBUG
 431                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 432                subs->datapipe, subs->syncpipe);
 433 #endif
 434
 435         return 0;
 436 }
 437
 438 /*
 439  * hw_params callback
 440  *
 441  * allocate a buffer and set the given audio format.
 442  *
 443  * so far we use a physically linear buffer although packetize transfer
 444  * doesn't need a continuous area.
 445  * if sg buffer is supported on the later version of alsa, we'll follow
 446  * that.
 447  */
 448 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 449                              struct snd_pcm_hw_params *hw_params)
 450 {
 451         struct snd_usb_substream *subs = substream->runtime->private_data;
 452         struct audioformat *fmt;
 453         unsigned int channels, rate, format;
 454         int ret, changed;
 455
 456         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 457                                                params_buffer_bytes(hw_params));
 458         if (ret < 0)
 459                 return ret;
 460
 461         format = params_format(hw_params);
 462         rate = params_rate(hw_params);
 463         channels = params_channels(hw_params);
 464         fmt = find_format(subs, format, rate, channels);
 465         if (!fmt) {
 466                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 467                            format, rate, channels);
 468                 return -EINVAL;
 469         }
 470
 471         changed = subs->cur_audiofmt != fmt ||
 472                 subs->period_bytes != params_period_bytes(hw_params) ||
 473                 subs->cur_rate != rate;
 474         if ((ret = set_format(subs, fmt)) < 0)
 475                 return ret;
 476
 477         if (subs->cur_rate != rate) {
 478                 struct usb_host_interface *alts;
 479                 struct usb_interface *iface;
 480                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 481                 alts = &iface->altsetting[fmt->altset_idx];
 482                 ret = snd_usb_init_sample_rate(subs->stream->chip, fmt->iface, alts, fmt, rate);
 483                 if (ret < 0)
 484                         return ret;
 485                 subs->cur_rate = rate;
 486         }
 487
 488         if (changed) {
 489                 mutex_lock(&subs->stream->chip->shutdown_mutex);
 490                 /* format changed */
 491                 stop_endpoints(subs, 0, 0, 0);
 492                 ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
 493                                                   subs->sync_endpoint);
 494                 if (ret < 0)
 495                         goto unlock;
 496
 497                 if (subs->sync_endpoint)
 498                         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 499                                                           hw_params, fmt, NULL);
 500 unlock:
 501                 mutex_unlock(&subs->stream->chip->shutdown_mutex);
 502         }
 503
 504         if (ret == 0) {
 505                 subs->interface = fmt->iface;
 506                 subs->altset_idx = fmt->altset_idx;
 507         }
 508
 509         return ret;
 510 }
 511
 512 /*
 513  * hw_free callback
 514  *
 515  * reset the audio format and release the buffer
 516  */
 517 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 518 {
 519         struct snd_usb_substream *subs = substream->runtime->private_data;
 520
 521         subs->cur_audiofmt = NULL;
 522         subs->cur_rate = 0;
 523         subs->period_bytes = 0;
 524         mutex_lock(&subs->stream->chip->shutdown_mutex);
 525         stop_endpoints(subs, 0, 1, 1);
 526         deactivate_endpoints(subs);
 527         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 528         return snd_pcm_lib_free_vmalloc_buffer(substream);
 529 }
 530
 531 /*
 532  * prepare callback
 533  *
 534  * only a few subtle things...
 535  */
 536 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 537 {
 538         struct snd_pcm_runtime *runtime = substream->runtime;
 539         struct snd_usb_substream *subs = runtime->private_data;
 540
 541         if (! subs->cur_audiofmt) {
 542                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 543                 return -ENXIO;
 544         }
 545
 546         if (snd_BUG_ON(!subs->data_endpoint))
 547                 return -EIO;
 548
 549         /* some unit conversions in runtime */
 550         subs->data_endpoint->maxframesize =
 551                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 552         subs->data_endpoint->curframesize =
 553                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 554
 555         /* reset the pointer */
 556         subs->hwptr_done = 0;
 557         subs->transfer_done = 0;
 558         subs->last_delay = 0;
 559         subs->last_frame_number = 0;
 560         runtime->delay = 0;
 561
 562         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 563          * updates for all URBs would happen at the same time when starting */
 564         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 565                 return start_endpoints(subs, 1);
 566
 567         return 0;
 568 }
 569
 570 static struct snd_pcm_hardware snd_usb_hardware =
 571 {
 572         .info =                 SNDRV_PCM_INFO_MMAP |
 573                                 SNDRV_PCM_INFO_MMAP_VALID |
 574                                 SNDRV_PCM_INFO_BATCH |
 575                                 SNDRV_PCM_INFO_INTERLEAVED |
 576                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 577                                 SNDRV_PCM_INFO_PAUSE,
 578         .buffer_bytes_max =     1024 * 1024,
 579         .period_bytes_min =     64,
 580         .period_bytes_max =     512 * 1024,
 581         .periods_min =          2,
 582         .periods_max =          1024,
 583 };
 584
 585 static int hw_check_valid_format(struct snd_usb_substream *subs,
 586                                  struct snd_pcm_hw_params *params,
 587                                  struct audioformat *fp)
 588 {
 589         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 590         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 591         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 592         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 593         struct snd_mask check_fmts;
 594         unsigned int ptime;
 595
 596         /* check the format */
 597         snd_mask_none(&check_fmts);
 598         check_fmts.bits[0] = (u32)fp->formats;
 599         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 600         snd_mask_intersect(&check_fmts, fmts);
 601         if (snd_mask_empty(&check_fmts)) {
 602                 hwc_debug("   > check: no supported format %d\n", fp->format);
 603                 return 0;
 604         }
 605         /* check the channels */
 606         if (fp->channels < ct->min || fp->channels > ct->max) {
 607                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 608                 return 0;
 609         }
 610         /* check the rate is within the range */
 611         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 612                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 613                 return 0;
 614         }
 615         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 616                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 617                 return 0;
 618         }
 619         /* check whether the period time is >= the data packet interval */
 620         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 621                 ptime = 125 * (1 << fp->datainterval);
 622                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 623                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 624                         return 0;
 625                 }
 626         }
 627         return 1;
 628 }
 629
 630 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 631                         struct snd_pcm_hw_rule *rule)
 632 {
 633         struct snd_usb_substream *subs = rule->private;
 634         struct list_head *p;
 635         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 636         unsigned int rmin, rmax;
 637         int changed;
 638
 639         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 640         changed = 0;
 641         rmin = rmax = 0;
 642         list_for_each(p, &subs->fmt_list) {
 643                 struct audioformat *fp;
 644                 fp = list_entry(p, struct audioformat, list);
 645                 if (!hw_check_valid_format(subs, params, fp))
 646                         continue;
 647                 if (changed++) {
 648                         if (rmin > fp->rate_min)
 649                                 rmin = fp->rate_min;
 650                         if (rmax < fp->rate_max)
 651                                 rmax = fp->rate_max;
 652                 } else {
 653                         rmin = fp->rate_min;
 654                         rmax = fp->rate_max;
 655                 }
 656         }
 657
 658         if (!changed) {
 659                 hwc_debug("  --> get empty\n");
 660                 it->empty = 1;
 661                 return -EINVAL;
 662         }
 663
 664         changed = 0;
 665         if (it->min < rmin) {
 666                 it->min = rmin;
 667                 it->openmin = 0;
 668                 changed = 1;
 669         }
 670         if (it->max > rmax) {
 671                 it->max = rmax;
 672                 it->openmax = 0;
 673                 changed = 1;
 674         }
 675         if (snd_interval_checkempty(it)) {
 676                 it->empty = 1;
 677                 return -EINVAL;
 678         }
 679         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 680         return changed;
 681 }
 682
 683
 684 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 685                             struct snd_pcm_hw_rule *rule)
 686 {
 687         struct snd_usb_substream *subs = rule->private;
 688         struct list_head *p;
 689         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 690         unsigned int rmin, rmax;
 691         int changed;
 692
 693         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 694         changed = 0;
 695         rmin = rmax = 0;
 696         list_for_each(p, &subs->fmt_list) {
 697                 struct audioformat *fp;
 698                 fp = list_entry(p, struct audioformat, list);
 699                 if (!hw_check_valid_format(subs, params, fp))
 700                         continue;
 701                 if (changed++) {
 702                         if (rmin > fp->channels)
 703                                 rmin = fp->channels;
 704                         if (rmax < fp->channels)
 705                                 rmax = fp->channels;
 706                 } else {
 707                         rmin = fp->channels;
 708                         rmax = fp->channels;
 709                 }
 710         }
 711
 712         if (!changed) {
 713                 hwc_debug("  --> get empty\n");
 714                 it->empty = 1;
 715                 return -EINVAL;
 716         }
 717
 718         changed = 0;
 719         if (it->min < rmin) {
 720                 it->min = rmin;
 721                 it->openmin = 0;
 722                 changed = 1;
 723         }
 724         if (it->max > rmax) {
 725                 it->max = rmax;
 726                 it->openmax = 0;
 727                 changed = 1;
 728         }
 729         if (snd_interval_checkempty(it)) {
 730                 it->empty = 1;
 731                 return -EINVAL;
 732         }
 733         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 734         return changed;
 735 }
 736
 737 static int hw_rule_format(struct snd_pcm_hw_params *params,
 738                           struct snd_pcm_hw_rule *rule)
 739 {
 740         struct snd_usb_substream *subs = rule->private;
 741         struct list_head *p;
 742         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 743         u64 fbits;
 744         u32 oldbits[2];
 745         int changed;
 746
 747         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 748         fbits = 0;
 749         list_for_each(p, &subs->fmt_list) {
 750                 struct audioformat *fp;
 751                 fp = list_entry(p, struct audioformat, list);
 752                 if (!hw_check_valid_format(subs, params, fp))
 753                         continue;
 754                 fbits |= fp->formats;
 755         }
 756
 757         oldbits[0] = fmt->bits[0];
 758         oldbits[1] = fmt->bits[1];
 759         fmt->bits[0] &= (u32)fbits;
 760         fmt->bits[1] &= (u32)(fbits >> 32);
 761         if (!fmt->bits[0] && !fmt->bits[1]) {
 762                 hwc_debug("  --> get empty\n");
 763                 return -EINVAL;
 764         }
 765         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 766         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 767         return changed;
 768 }
 769
 770 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 771                                struct snd_pcm_hw_rule *rule)
 772 {
 773         struct snd_usb_substream *subs = rule->private;
 774         struct audioformat *fp;
 775         struct snd_interval *it;
 776         unsigned char min_datainterval;
 777         unsigned int pmin;
 778         int changed;
 779
 780         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 781         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 782         min_datainterval = 0xff;
 783         list_for_each_entry(fp, &subs->fmt_list, list) {
 784                 if (!hw_check_valid_format(subs, params, fp))
 785                         continue;
 786                 min_datainterval = min(min_datainterval, fp->datainterval);
 787         }
 788         if (min_datainterval == 0xff) {
 789                 hwc_debug("  --> get empty\n");
 790                 it->empty = 1;
 791                 return -EINVAL;
 792         }
 793         pmin = 125 * (1 << min_datainterval);
 794         changed = 0;
 795         if (it->min < pmin) {
 796                 it->min = pmin;
 797                 it->openmin = 0;
 798                 changed = 1;
 799         }
 800         if (snd_interval_checkempty(it)) {
 801                 it->empty = 1;
 802                 return -EINVAL;
 803         }
 804         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 805         return changed;
 806 }
 807
 808 /*
 809  *  If the device supports unusual bit rates, does the request meet these?
 810  */
 811 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 812                                   struct snd_usb_substream *subs)
 813 {
 814         struct audioformat *fp;
 815         int *rate_list;
 816         int count = 0, needs_knot = 0;
 817         int err;
 818
 819         kfree(subs->rate_list.list);
 820         subs->rate_list.list = NULL;
 821
 822         list_for_each_entry(fp, &subs->fmt_list, list) {
 823                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 824                         return 0;
 825                 count += fp->nr_rates;
 826                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 827                         needs_knot = 1;
 828         }
 829         if (!needs_knot)
 830                 return 0;
 831
 832         subs->rate_list.list = rate_list =
 833                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 834         if (!subs->rate_list.list)
 835                 return -ENOMEM;
 836         subs->rate_list.count = count;
 837         subs->rate_list.mask = 0;
 838         count = 0;
 839         list_for_each_entry(fp, &subs->fmt_list, list) {
 840                 int i;
 841                 for (i = 0; i < fp->nr_rates; i++)
 842                         rate_list[count++] = fp->rate_table[i];
 843         }
 844         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 845                                          &subs->rate_list);
 846         if (err < 0)
 847                 return err;
 848
 849         return 0;
 850 }
 851
 852
 853 /*
 854  * set up the runtime hardware information.
 855  */
 856
 857 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 858 {
 859         struct list_head *p;
 860         unsigned int pt, ptmin;
 861         int param_period_time_if_needed;
 862         int err;
 863
 864         runtime->hw.formats = subs->formats;
 865
 866         runtime->hw.rate_min = 0x7fffffff;
 867         runtime->hw.rate_max = 0;
 868         runtime->hw.channels_min = 256;
 869         runtime->hw.channels_max = 0;
 870         runtime->hw.rates = 0;
 871         ptmin = UINT_MAX;
 872         /* check min/max rates and channels */
 873         list_for_each(p, &subs->fmt_list) {
 874                 struct audioformat *fp;
 875                 fp = list_entry(p, struct audioformat, list);
 876                 runtime->hw.rates |= fp->rates;
 877                 if (runtime->hw.rate_min > fp->rate_min)
 878                         runtime->hw.rate_min = fp->rate_min;
 879                 if (runtime->hw.rate_max < fp->rate_max)
 880                         runtime->hw.rate_max = fp->rate_max;
 881                 if (runtime->hw.channels_min > fp->channels)
 882                         runtime->hw.channels_min = fp->channels;
 883                 if (runtime->hw.channels_max < fp->channels)
 884                         runtime->hw.channels_max = fp->channels;
 885                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 886                         /* FIXME: there might be more than one audio formats... */
 887                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 888                                 fp->frame_size;
 889                 }
 890                 pt = 125 * (1 << fp->datainterval);
 891                 ptmin = min(ptmin, pt);
 892         }
 893         err = snd_usb_autoresume(subs->stream->chip);
 894         if (err < 0)
 895                 return err;
 896
 897         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 898         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 899                 /* full speed devices have fixed data packet interval */
 900                 ptmin = 1000;
 901         if (ptmin == 1000)
 902                 /* if period time doesn't go below 1 ms, no rules needed */
 903                 param_period_time_if_needed = -1;
 904         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 905                                      ptmin, UINT_MAX);
 906
 907         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 908                                        hw_rule_rate, subs,
 909                                        SNDRV_PCM_HW_PARAM_FORMAT,
 910                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 911                                        param_period_time_if_needed,
 912                                        -1)) < 0)
 913                 goto rep_err;
 914         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 915                                        hw_rule_channels, subs,
 916                                        SNDRV_PCM_HW_PARAM_FORMAT,
 917                                        SNDRV_PCM_HW_PARAM_RATE,
 918                                        param_period_time_if_needed,
 919                                        -1)) < 0)
 920                 goto rep_err;
 921         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 922                                        hw_rule_format, subs,
 923                                        SNDRV_PCM_HW_PARAM_RATE,
 924                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 925                                        param_period_time_if_needed,
 926                                        -1)) < 0)
 927                 goto rep_err;
 928         if (param_period_time_if_needed >= 0) {
 929                 err = snd_pcm_hw_rule_add(runtime, 0,
 930                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 931                                           hw_rule_period_time, subs,
 932                                           SNDRV_PCM_HW_PARAM_FORMAT,
 933                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 934                                           SNDRV_PCM_HW_PARAM_RATE,
 935                                           -1);
 936                 if (err < 0)
 937                         goto rep_err;
 938         }
 939         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 940                 goto rep_err;
 941         return 0;
 942
 943 rep_err:
 944         snd_usb_autosuspend(subs->stream->chip);
 945         return err;
 946 }
 947
 948 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 949 {
 950         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 951         struct snd_pcm_runtime *runtime = substream->runtime;
 952         struct snd_usb_substream *subs = &as->substream[direction];
 953
 954         subs->interface = -1;
 955         subs->altset_idx = 0;
 956         runtime->hw = snd_usb_hardware;
 957         runtime->private_data = subs;
 958         subs->pcm_substream = substream;
 959         /* runtime PM is also done there */
 960         return setup_hw_info(runtime, subs);
 961 }
 962
 963 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 964 {
 965         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 966         struct snd_usb_substream *subs = &as->substream[direction];
 967
 968         stop_endpoints(subs, 0, 0, 0);
 969
 970         if (!as->chip->shutdown && subs->interface >= 0) {
 971                 usb_set_interface(subs->dev, subs->interface, 0);
 972                 subs->interface = -1;
 973         }
 974
 975         subs->pcm_substream = NULL;
 976         snd_usb_autosuspend(subs->stream->chip);
 977
 978         return 0;
 979 }
 980
 981 /* Since a URB can handle only a single linear buffer, we must use double
 982  * buffering when the data to be transferred overflows the buffer boundary.
 983  * To avoid inconsistencies when updating hwptr_done, we use double buffering
 984  * for all URBs.
 985  */
 986 static void retire_capture_urb(struct snd_usb_substream *subs,
 987                                struct urb *urb)
 988 {
 989         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
 990         unsigned int stride, frames, bytes, oldptr;
 991         int i, period_elapsed = 0;
 992         unsigned long flags;
 993         unsigned char *cp;
 994
 995         stride = runtime->frame_bits >> 3;
 996
 997         for (i = 0; i < urb->number_of_packets; i++) {
 998                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 999                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1000                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1001                         // continue;
1002                 }
1003                 bytes = urb->iso_frame_desc[i].actual_length;
1004                 frames = bytes / stride;
1005                 if (!subs->txfr_quirk)
1006                         bytes = frames * stride;
1007                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1008 #ifdef CONFIG_SND_DEBUG_VERBOSE
1009                         int oldbytes = bytes;
1010 #endif
1011                         bytes = frames * stride;
1012                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1013                                                         oldbytes, bytes);
1014                 }
1015                 /* update the current pointer */
1016                 spin_lock_irqsave(&subs->lock, flags);
1017                 oldptr = subs->hwptr_done;
1018                 subs->hwptr_done += bytes;
1019                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1020                         subs->hwptr_done -= runtime->buffer_size * stride;
1021                 frames = (bytes + (oldptr % stride)) / stride;
1022                 subs->transfer_done += frames;
1023                 if (subs->transfer_done >= runtime->period_size) {
1024                         subs->transfer_done -= runtime->period_size;
1025                         period_elapsed = 1;
1026                 }
1027                 spin_unlock_irqrestore(&subs->lock, flags);
1028                 /* copy a data chunk */
1029                 if (oldptr + bytes > runtime->buffer_size * stride) {
1030                         unsigned int bytes1 =
1031                                         runtime->buffer_size * stride - oldptr;
1032                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1033                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1034                 } else {
1035                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1036                 }
1037         }
1038
1039         if (period_elapsed)
1040                 snd_pcm_period_elapsed(subs->pcm_substream);
1041 }
1042
1043 static void prepare_playback_urb(struct snd_usb_substream *subs,
1044                                  struct urb *urb)
1045 {
1046         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1047         struct snd_usb_endpoint *ep = subs->data_endpoint;
1048         struct snd_urb_ctx *ctx = urb->context;
1049         unsigned int counts, frames, bytes;
1050         int i, stride, period_elapsed = 0;
1051         unsigned long flags;
1052
1053         stride = runtime->frame_bits >> 3;
1054
1055         frames = 0;
1056         urb->number_of_packets = 0;
1057         spin_lock_irqsave(&subs->lock, flags);
1058         for (i = 0; i < ctx->packets; i++) {
1059                 if (ctx->packet_size[i])
1060                         counts = ctx->packet_size[i];
1061                 else
1062                         counts = snd_usb_endpoint_next_packet_size(ep);
1063
1064                 /* set up descriptor */
1065                 urb->iso_frame_desc[i].offset = frames * stride;
1066                 urb->iso_frame_desc[i].length = counts * stride;
1067                 frames += counts;
1068                 urb->number_of_packets++;
1069                 subs->transfer_done += counts;
1070                 if (subs->transfer_done >= runtime->period_size) {
1071                         subs->transfer_done -= runtime->period_size;
1072                         period_elapsed = 1;
1073                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1074                                 if (subs->transfer_done > 0) {
1075                                         /* FIXME: fill-max mode is not
1076                                          * supported yet */
1077                                         frames -= subs->transfer_done;
1078                                         counts -= subs->transfer_done;
1079                                         urb->iso_frame_desc[i].length =
1080                                                 counts * stride;
1081                                         subs->transfer_done = 0;
1082                                 }
1083                                 i++;
1084                                 if (i < ctx->packets) {
1085                                         /* add a transfer delimiter */
1086                                         urb->iso_frame_desc[i].offset =
1087                                                 frames * stride;
1088                                         urb->iso_frame_desc[i].length = 0;
1089                                         urb->number_of_packets++;
1090                                 }
1091                                 break;
1092                         }
1093                 }
1094                 if (period_elapsed &&
1095                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1096                         break;
1097         }
1098         bytes = frames * stride;
1099         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1100                 /* err, the transferred area goes over buffer boundary. */
1101                 unsigned int bytes1 =
1102                         runtime->buffer_size * stride - subs->hwptr_done;
1103                 memcpy(urb->transfer_buffer,
1104                        runtime->dma_area + subs->hwptr_done, bytes1);
1105                 memcpy(urb->transfer_buffer + bytes1,
1106                        runtime->dma_area, bytes - bytes1);
1107         } else {
1108                 memcpy(urb->transfer_buffer,
1109                        runtime->dma_area + subs->hwptr_done, bytes);
1110         }
1111         subs->hwptr_done += bytes;
1112         if (subs->hwptr_done >= runtime->buffer_size * stride)
1113                 subs->hwptr_done -= runtime->buffer_size * stride;
1114
1115         /* update delay with exact number of samples queued */
1116         runtime->delay = subs->last_delay;
1117         runtime->delay += frames;
1118         subs->last_delay = runtime->delay;
1119
1120         /* realign last_frame_number */
1121         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1122         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1123
1124         spin_unlock_irqrestore(&subs->lock, flags);
1125         urb->transfer_buffer_length = bytes;
1126         if (period_elapsed)
1127                 snd_pcm_period_elapsed(subs->pcm_substream);
1128 }
1129
1130 /*
1131  * process after playback data complete
1132  * - decrease the delay count again
1133  */
1134 static void retire_playback_urb(struct snd_usb_substream *subs,
1135                                struct urb *urb)
1136 {
1137         unsigned long flags;
1138         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1139         int stride = runtime->frame_bits >> 3;
1140         int processed = urb->transfer_buffer_length / stride;
1141         int est_delay;
1142
1143         /* ignore the delay accounting when procssed=0 is given, i.e.
1144          * silent payloads are procssed before handling the actual data
1145          */
1146         if (!processed)
1147                 return;
1148
1149         spin_lock_irqsave(&subs->lock, flags);
1150         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1151         /* update delay with exact number of samples played */
1152         if (processed > subs->last_delay)
1153                 subs->last_delay = 0;
1154         else
1155                 subs->last_delay -= processed;
1156         runtime->delay = subs->last_delay;
1157
1158         /*
1159          * Report when delay estimate is off by more than 2ms.
1160          * The error should be lower than 2ms since the estimate relies
1161          * on two reads of a counter updated every ms.
1162          */
1163         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1164                 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1165                         est_delay, subs->last_delay);
1166
1167         spin_unlock_irqrestore(&subs->lock, flags);
1168 }
1169
1170 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1171 {
1172         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1173 }
1174
1175 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1176 {
1177         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1178 }
1179
1180 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1181 {
1182         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1183 }
1184
1185 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1186 {
1187         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1188 }
1189
1190 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1191                                               int cmd)
1192 {
1193         struct snd_usb_substream *subs = substream->runtime->private_data;
1194
1195         switch (cmd) {
1196         case SNDRV_PCM_TRIGGER_START:
1197         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1198                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1199                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1200                 subs->running = 1;
1201                 return 0;
1202         case SNDRV_PCM_TRIGGER_STOP:
1203                 stop_endpoints(subs, 0, 0, 0);
1204                 subs->running = 0;
1205                 return 0;
1206         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1207                 subs->data_endpoint->prepare_data_urb = NULL;
1208                 subs->data_endpoint->retire_data_urb = NULL;
1209                 subs->running = 0;
1210                 return 0;
1211         }
1212
1213         return -EINVAL;
1214 }
1215
1216 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1217                                              int cmd)
1218 {
1219         int err;
1220         struct snd_usb_substream *subs = substream->runtime->private_data;
1221
1222         switch (cmd) {
1223         case SNDRV_PCM_TRIGGER_START:
1224                 err = start_endpoints(subs, 0);
1225                 if (err < 0)
1226                         return err;
1227
1228                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1229                 subs->running = 1;
1230                 return 0;
1231         case SNDRV_PCM_TRIGGER_STOP:
1232                 stop_endpoints(subs, 0, 0, 0);
1233                 subs->running = 0;
1234                 return 0;
1235         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1236                 subs->data_endpoint->retire_data_urb = NULL;
1237                 subs->running = 0;
1238                 return 0;
1239         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1240                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1241                 subs->running = 1;
1242                 return 0;
1243         }
1244
1245         return -EINVAL;
1246 }
1247
1248 static struct snd_pcm_ops snd_usb_playback_ops = {
1249         .open =         snd_usb_playback_open,
1250         .close =        snd_usb_playback_close,
1251         .ioctl =        snd_pcm_lib_ioctl,
1252         .hw_params =    snd_usb_hw_params,
1253         .hw_free =      snd_usb_hw_free,
1254         .prepare =      snd_usb_pcm_prepare,
1255         .trigger =      snd_usb_substream_playback_trigger,
1256         .pointer =      snd_usb_pcm_pointer,
1257         .page =         snd_pcm_lib_get_vmalloc_page,
1258         .mmap =         snd_pcm_lib_mmap_vmalloc,
1259 };
1260
1261 static struct snd_pcm_ops snd_usb_capture_ops = {
1262         .open =         snd_usb_capture_open,
1263         .close =        snd_usb_capture_close,
1264         .ioctl =        snd_pcm_lib_ioctl,
1265         .hw_params =    snd_usb_hw_params,
1266         .hw_free =      snd_usb_hw_free,
1267         .prepare =      snd_usb_pcm_prepare,
1268         .trigger =      snd_usb_substream_capture_trigger,
1269         .pointer =      snd_usb_pcm_pointer,
1270         .page =         snd_pcm_lib_get_vmalloc_page,
1271         .mmap =         snd_pcm_lib_mmap_vmalloc,
1272 };
1273
1274 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1275 {
1276         snd_pcm_set_ops(pcm, stream,
1277                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1278                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1279 }