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         if (subs->stream->chip->shutdown)
  75                 return SNDRV_PCM_POS_XRUN;
  76         spin_lock(&subs->lock);
  77         hwptr_done = subs->hwptr_done;
  78         substream->runtime->delay = snd_usb_pcm_delay(subs,
  79                                                 substream->runtime->rate);
  80         spin_unlock(&subs->lock);
  81         return hwptr_done / (substream->runtime->frame_bits >> 3);
  82 }
  83
  84 /*
  85  * find a matching audio format
  86  */
  87 static struct audioformat *find_format(struct snd_usb_substream *subs)
  88 {
  89         struct list_head *p;
  90         struct audioformat *found = NULL;
  91         int cur_attr = 0, attr;
  92
  93         list_for_each(p, &subs->fmt_list) {
  94                 struct audioformat *fp;
  95                 fp = list_entry(p, struct audioformat, list);
  96                 if (!(fp->formats & (1uLL << subs->pcm_format)))
  97                         continue;
  98                 if (fp->channels != subs->channels)
  99                         continue;
 100                 if (subs->cur_rate < fp->rate_min ||
 101                     subs->cur_rate > fp->rate_max)
 102                         continue;
 103                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 104                         unsigned int i;
 105                         for (i = 0; i < fp->nr_rates; i++)
 106                                 if (fp->rate_table[i] == subs->cur_rate)
 107                                         break;
 108                         if (i >= fp->nr_rates)
 109                                 continue;
 110                 }
 111                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 112                 if (! found) {
 113                         found = fp;
 114                         cur_attr = attr;
 115                         continue;
 116                 }
 117                 /* avoid async out and adaptive in if the other method
 118                  * supports the same format.
 119                  * this is a workaround for the case like
 120                  * M-audio audiophile USB.
 121                  */
 122                 if (attr != cur_attr) {
 123                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 127                                 continue;
 128                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 129                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 130                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 131                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 132                                 found = fp;
 133                                 cur_attr = attr;
 134                                 continue;
 135                         }
 136                 }
 137                 /* find the format with the largest max. packet size */
 138                 if (fp->maxpacksize > found->maxpacksize) {
 139                         found = fp;
 140                         cur_attr = attr;
 141                 }
 142         }
 143         return found;
 144 }
 145
 146 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 147                          struct usb_host_interface *alts,
 148                          struct audioformat *fmt)
 149 {
 150         struct usb_device *dev = chip->dev;
 151         unsigned int ep;
 152         unsigned char data[1];
 153         int err;
 154
 155         ep = get_endpoint(alts, 0)->bEndpointAddress;
 156
 157         data[0] = 1;
 158         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 159                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 160                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 161                                    data, sizeof(data))) < 0) {
 162                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 163                            dev->devnum, iface, ep);
 164                 return err;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 171                          struct usb_host_interface *alts,
 172                          struct audioformat *fmt)
 173 {
 174         struct usb_device *dev = chip->dev;
 175         unsigned char data[1];
 176         int err;
 177
 178         data[0] = 1;
 179         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 180                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 181                                    UAC2_EP_CS_PITCH << 8, 0,
 182                                    data, sizeof(data))) < 0) {
 183                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 184                            dev->devnum, iface, fmt->altsetting);
 185                 return err;
 186         }
 187
 188         return 0;
 189 }
 190
 191 /*
 192  * initialize the pitch control and sample rate
 193  */
 194 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 195                        struct usb_host_interface *alts,
 196                        struct audioformat *fmt)
 197 {
 198         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 199
 200         /* if endpoint doesn't have pitch control, bail out */
 201         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 202                 return 0;
 203
 204         switch (altsd->bInterfaceProtocol) {
 205         case UAC_VERSION_1:
 206         default:
 207                 return init_pitch_v1(chip, iface, alts, fmt);
 208
 209         case UAC_VERSION_2:
 210                 return init_pitch_v2(chip, iface, alts, fmt);
 211         }
 212 }
 213
 214 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
 215 {
 216         int err;
 217
 218         if (!subs->data_endpoint)
 219                 return -EINVAL;
 220
 221         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 222                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 223
 224                 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
 225
 226                 ep->data_subs = subs;
 227                 err = snd_usb_endpoint_start(ep, can_sleep);
 228                 if (err < 0) {
 229                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 230                         return err;
 231                 }
 232         }
 233
 234         if (subs->sync_endpoint &&
 235             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 236                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 237
 238                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 239                     subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
 240                         err = usb_set_interface(subs->dev,
 241                                                 subs->sync_endpoint->iface,
 242                                                 subs->sync_endpoint->alt_idx);
 243                         if (err < 0) {
 244                                 snd_printk(KERN_ERR
 245                                            "%d:%d:%d: cannot set interface (%d)\n",
 246                                            subs->dev->devnum,
 247                                            subs->sync_endpoint->iface,
 248                                            subs->sync_endpoint->alt_idx, err);
 249                                 return -EIO;
 250                         }
 251                 }
 252
 253                 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
 254
 255                 ep->sync_slave = subs->data_endpoint;
 256                 err = snd_usb_endpoint_start(ep, can_sleep);
 257                 if (err < 0) {
 258                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 259                         return err;
 260                 }
 261         }
 262
 263         return 0;
 264 }
 265
 266 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 267 {
 268         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 269                 snd_usb_endpoint_stop(subs->sync_endpoint, wait);
 270
 271         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 272                 snd_usb_endpoint_stop(subs->data_endpoint, wait);
 273 }
 274
 275 static int deactivate_endpoints(struct snd_usb_substream *subs)
 276 {
 277         int reta, retb;
 278
 279         reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
 280         retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
 281
 282         if (reta < 0)
 283                 return reta;
 284
 285         if (retb < 0)
 286                 return retb;
 287
 288         return 0;
 289 }
 290
 291 /*
 292  * find a matching format and set up the interface
 293  */
 294 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 295 {
 296         struct usb_device *dev = subs->dev;
 297         struct usb_host_interface *alts;
 298         struct usb_interface_descriptor *altsd;
 299         struct usb_interface *iface;
 300         unsigned int ep, attr;
 301         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 302         int err, implicit_fb = 0;
 303
 304         iface = usb_ifnum_to_if(dev, fmt->iface);
 305         if (WARN_ON(!iface))
 306                 return -EINVAL;
 307         alts = &iface->altsetting[fmt->altset_idx];
 308         altsd = get_iface_desc(alts);
 309         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 310                 return -EINVAL;
 311
 312         if (fmt == subs->cur_audiofmt)
 313                 return 0;
 314
 315         /* close the old interface */
 316         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 317                 err = usb_set_interface(subs->dev, subs->interface, 0);
 318                 if (err < 0) {
 319                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
 320                                 dev->devnum, fmt->iface, fmt->altsetting, err);
 321                         return -EIO;
 322                 }
 323                 subs->interface = -1;
 324                 subs->altset_idx = 0;
 325         }
 326
 327         /* set interface */
 328         if (subs->interface != fmt->iface ||
 329             subs->altset_idx != fmt->altset_idx) {
 330                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 331                 if (err < 0) {
 332                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
 333                                    dev->devnum, fmt->iface, fmt->altsetting, err);
 334                         return -EIO;
 335                 }
 336                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
 337                                 fmt->iface, fmt->altsetting);
 338                 subs->interface = fmt->iface;
 339                 subs->altset_idx = fmt->altset_idx;
 340         }
 341
 342         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 343                                                    alts, fmt->endpoint, subs->direction,
 344                                                    SND_USB_ENDPOINT_TYPE_DATA);
 345         if (!subs->data_endpoint)
 346                 return -EINVAL;
 347
 348         /* we need a sync pipe in async OUT or adaptive IN mode */
 349         /* check the number of EP, since some devices have broken
 350          * descriptors which fool us.  if it has only one EP,
 351          * assume it as adaptive-out or sync-in.
 352          */
 353         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 354
 355         switch (subs->stream->chip->usb_id) {
 356         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 357         case USB_ID(0x0763, 0x2081):
 358                 if (is_playback) {
 359                         implicit_fb = 1;
 360                         ep = 0x81;
 361                         iface = usb_ifnum_to_if(dev, 2);
 362
 363                         if (!iface || iface->num_altsetting == 0)
 364                                 return -EINVAL;
 365
 366                         alts = &iface->altsetting[1];
 367                         goto add_sync_ep;
 368                 }
 369         }
 370
 371         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 372              (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 373             altsd->bNumEndpoints >= 2) {
 374                 /* check sync-pipe endpoint */
 375                 /* ... and check descriptor size before accessing bSynchAddress
 376                    because there is a version of the SB Audigy 2 NX firmware lacking
 377                    the audio fields in the endpoint descriptors */
 378                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 379                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 380                      get_endpoint(alts, 1)->bSynchAddress != 0 &&
 381                      !implicit_fb)) {
 382                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 383                                    dev->devnum, fmt->iface, fmt->altsetting,
 384                                    get_endpoint(alts, 1)->bmAttributes,
 385                                    get_endpoint(alts, 1)->bLength,
 386                                    get_endpoint(alts, 1)->bSynchAddress);
 387                         return -EINVAL;
 388                 }
 389                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 390                 if (!implicit_fb &&
 391                     get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 392                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 393                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 394                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 395                                    dev->devnum, fmt->iface, fmt->altsetting,
 396                                    is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 397                         return -EINVAL;
 398                 }
 399
 400                 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 401                                 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 402
 403 add_sync_ep:
 404                 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 405                                                            alts, ep, !subs->direction,
 406                                                            implicit_fb ?
 407                                                                 SND_USB_ENDPOINT_TYPE_DATA :
 408                                                                 SND_USB_ENDPOINT_TYPE_SYNC);
 409                 if (!subs->sync_endpoint)
 410                         return -EINVAL;
 411
 412                 subs->data_endpoint->sync_master = subs->sync_endpoint;
 413         }
 414
 415         if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
 416                 return err;
 417
 418         subs->cur_audiofmt = fmt;
 419
 420         snd_usb_set_format_quirk(subs, fmt);
 421
 422 #if 0
 423         printk(KERN_DEBUG
 424                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 425                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 426         printk(KERN_DEBUG
 427                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 428                subs->datapipe, subs->syncpipe);
 429 #endif
 430
 431         return 0;
 432 }
 433
 434 /*
 435  * configure endpoint params
 436  *
 437  * called  during initial setup and upon resume
 438  */
 439 static int configure_endpoint(struct snd_usb_substream *subs)
 440 {
 441         int ret;
 442
 443         /* format changed */
 444         stop_endpoints(subs, false);
 445         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 446                                           subs->pcm_format,
 447                                           subs->channels,
 448                                           subs->period_bytes,
 449                                           subs->cur_rate,
 450                                           subs->cur_audiofmt,
 451                                           subs->sync_endpoint);
 452         if (ret < 0)
 453                 return ret;
 454
 455         if (subs->sync_endpoint)
 456                 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 457                                                   subs->pcm_format,
 458                                                   subs->channels,
 459                                                   subs->period_bytes,
 460                                                   subs->cur_rate,
 461                                                   subs->cur_audiofmt,
 462                                                   NULL);
 463         return ret;
 464 }
 465
 466 /*
 467  * hw_params callback
 468  *
 469  * allocate a buffer and set the given audio format.
 470  *
 471  * so far we use a physically linear buffer although packetize transfer
 472  * doesn't need a continuous area.
 473  * if sg buffer is supported on the later version of alsa, we'll follow
 474  * that.
 475  */
 476 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 477                              struct snd_pcm_hw_params *hw_params)
 478 {
 479         struct snd_usb_substream *subs = substream->runtime->private_data;
 480         struct audioformat *fmt;
 481         int ret;
 482
 483         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 484                                                params_buffer_bytes(hw_params));
 485         if (ret < 0)
 486                 return ret;
 487
 488         subs->pcm_format = params_format(hw_params);
 489         subs->period_bytes = params_period_bytes(hw_params);
 490         subs->channels = params_channels(hw_params);
 491         subs->cur_rate = params_rate(hw_params);
 492
 493         fmt = find_format(subs);
 494         if (!fmt) {
 495                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 496                            subs->pcm_format, subs->cur_rate, subs->channels);
 497                 return -EINVAL;
 498         }
 499
 500         down_read(&subs->stream->chip->shutdown_rwsem);
 501         if (subs->stream->chip->shutdown)
 502                 ret = -ENODEV;
 503         else
 504                 ret = set_format(subs, fmt);
 505         up_read(&subs->stream->chip->shutdown_rwsem);
 506         if (ret < 0)
 507                 return ret;
 508
 509         subs->interface = fmt->iface;
 510         subs->altset_idx = fmt->altset_idx;
 511         subs->need_setup_ep = true;
 512
 513         return 0;
 514 }
 515
 516 /*
 517  * hw_free callback
 518  *
 519  * reset the audio format and release the buffer
 520  */
 521 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 522 {
 523         struct snd_usb_substream *subs = substream->runtime->private_data;
 524
 525         subs->cur_audiofmt = NULL;
 526         subs->cur_rate = 0;
 527         subs->period_bytes = 0;
 528         down_read(&subs->stream->chip->shutdown_rwsem);
 529         if (!subs->stream->chip->shutdown) {
 530                 stop_endpoints(subs, true);
 531                 deactivate_endpoints(subs);
 532         }
 533         up_read(&subs->stream->chip->shutdown_rwsem);
 534         return snd_pcm_lib_free_vmalloc_buffer(substream);
 535 }
 536
 537 /*
 538  * prepare callback
 539  *
 540  * only a few subtle things...
 541  */
 542 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 543 {
 544         struct snd_pcm_runtime *runtime = substream->runtime;
 545         struct snd_usb_substream *subs = runtime->private_data;
 546         struct usb_host_interface *alts;
 547         struct usb_interface *iface;
 548         int ret;
 549
 550         if (! subs->cur_audiofmt) {
 551                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 552                 return -ENXIO;
 553         }
 554
 555         down_read(&subs->stream->chip->shutdown_rwsem);
 556         if (subs->stream->chip->shutdown) {
 557                 ret = -ENODEV;
 558                 goto unlock;
 559         }
 560         if (snd_BUG_ON(!subs->data_endpoint)) {
 561                 ret = -EIO;
 562                 goto unlock;
 563         }
 564
 565         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 566         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 567
 568         ret = set_format(subs, subs->cur_audiofmt);
 569         if (ret < 0)
 570                 goto unlock;
 571
 572         iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 573         alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 574         ret = snd_usb_init_sample_rate(subs->stream->chip,
 575                                        subs->cur_audiofmt->iface,
 576                                        alts,
 577                                        subs->cur_audiofmt,
 578                                        subs->cur_rate);
 579         if (ret < 0)
 580                 goto unlock;
 581
 582         if (subs->need_setup_ep) {
 583                 ret = configure_endpoint(subs);
 584                 if (ret < 0)
 585                         goto unlock;
 586                 subs->need_setup_ep = false;
 587         }
 588
 589         /* some unit conversions in runtime */
 590         subs->data_endpoint->maxframesize =
 591                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 592         subs->data_endpoint->curframesize =
 593                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 594
 595         /* reset the pointer */
 596         subs->hwptr_done = 0;
 597         subs->transfer_done = 0;
 598         subs->last_delay = 0;
 599         subs->last_frame_number = 0;
 600         runtime->delay = 0;
 601
 602         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 603          * updates for all URBs would happen at the same time when starting */
 604         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 605                 ret = start_endpoints(subs, true);
 606
 607  unlock:
 608         up_read(&subs->stream->chip->shutdown_rwsem);
 609         return ret;
 610 }
 611
 612 static struct snd_pcm_hardware snd_usb_hardware =
 613 {
 614         .info =                 SNDRV_PCM_INFO_MMAP |
 615                                 SNDRV_PCM_INFO_MMAP_VALID |
 616                                 SNDRV_PCM_INFO_BATCH |
 617                                 SNDRV_PCM_INFO_INTERLEAVED |
 618                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 619                                 SNDRV_PCM_INFO_PAUSE,
 620         .buffer_bytes_max =     1024 * 1024,
 621         .period_bytes_min =     64,
 622         .period_bytes_max =     512 * 1024,
 623         .periods_min =          2,
 624         .periods_max =          1024,
 625 };
 626
 627 static int hw_check_valid_format(struct snd_usb_substream *subs,
 628                                  struct snd_pcm_hw_params *params,
 629                                  struct audioformat *fp)
 630 {
 631         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 632         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 633         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 634         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 635         struct snd_mask check_fmts;
 636         unsigned int ptime;
 637
 638         /* check the format */
 639         snd_mask_none(&check_fmts);
 640         check_fmts.bits[0] = (u32)fp->formats;
 641         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 642         snd_mask_intersect(&check_fmts, fmts);
 643         if (snd_mask_empty(&check_fmts)) {
 644                 hwc_debug("   > check: no supported format %d\n", fp->format);
 645                 return 0;
 646         }
 647         /* check the channels */
 648         if (fp->channels < ct->min || fp->channels > ct->max) {
 649                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 650                 return 0;
 651         }
 652         /* check the rate is within the range */
 653         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 654                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 655                 return 0;
 656         }
 657         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 658                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 659                 return 0;
 660         }
 661         /* check whether the period time is >= the data packet interval */
 662         if (subs->speed != USB_SPEED_FULL) {
 663                 ptime = 125 * (1 << fp->datainterval);
 664                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 665                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 666                         return 0;
 667                 }
 668         }
 669         return 1;
 670 }
 671
 672 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 673                         struct snd_pcm_hw_rule *rule)
 674 {
 675         struct snd_usb_substream *subs = rule->private;
 676         struct list_head *p;
 677         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 678         unsigned int rmin, rmax;
 679         int changed;
 680
 681         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 682         changed = 0;
 683         rmin = rmax = 0;
 684         list_for_each(p, &subs->fmt_list) {
 685                 struct audioformat *fp;
 686                 fp = list_entry(p, struct audioformat, list);
 687                 if (!hw_check_valid_format(subs, params, fp))
 688                         continue;
 689                 if (changed++) {
 690                         if (rmin > fp->rate_min)
 691                                 rmin = fp->rate_min;
 692                         if (rmax < fp->rate_max)
 693                                 rmax = fp->rate_max;
 694                 } else {
 695                         rmin = fp->rate_min;
 696                         rmax = fp->rate_max;
 697                 }
 698         }
 699
 700         if (!changed) {
 701                 hwc_debug("  --> get empty\n");
 702                 it->empty = 1;
 703                 return -EINVAL;
 704         }
 705
 706         changed = 0;
 707         if (it->min < rmin) {
 708                 it->min = rmin;
 709                 it->openmin = 0;
 710                 changed = 1;
 711         }
 712         if (it->max > rmax) {
 713                 it->max = rmax;
 714                 it->openmax = 0;
 715                 changed = 1;
 716         }
 717         if (snd_interval_checkempty(it)) {
 718                 it->empty = 1;
 719                 return -EINVAL;
 720         }
 721         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 722         return changed;
 723 }
 724
 725
 726 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 727                             struct snd_pcm_hw_rule *rule)
 728 {
 729         struct snd_usb_substream *subs = rule->private;
 730         struct list_head *p;
 731         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 732         unsigned int rmin, rmax;
 733         int changed;
 734
 735         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 736         changed = 0;
 737         rmin = rmax = 0;
 738         list_for_each(p, &subs->fmt_list) {
 739                 struct audioformat *fp;
 740                 fp = list_entry(p, struct audioformat, list);
 741                 if (!hw_check_valid_format(subs, params, fp))
 742                         continue;
 743                 if (changed++) {
 744                         if (rmin > fp->channels)
 745                                 rmin = fp->channels;
 746                         if (rmax < fp->channels)
 747                                 rmax = fp->channels;
 748                 } else {
 749                         rmin = fp->channels;
 750                         rmax = fp->channels;
 751                 }
 752         }
 753
 754         if (!changed) {
 755                 hwc_debug("  --> get empty\n");
 756                 it->empty = 1;
 757                 return -EINVAL;
 758         }
 759
 760         changed = 0;
 761         if (it->min < rmin) {
 762                 it->min = rmin;
 763                 it->openmin = 0;
 764                 changed = 1;
 765         }
 766         if (it->max > rmax) {
 767                 it->max = rmax;
 768                 it->openmax = 0;
 769                 changed = 1;
 770         }
 771         if (snd_interval_checkempty(it)) {
 772                 it->empty = 1;
 773                 return -EINVAL;
 774         }
 775         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 776         return changed;
 777 }
 778
 779 static int hw_rule_format(struct snd_pcm_hw_params *params,
 780                           struct snd_pcm_hw_rule *rule)
 781 {
 782         struct snd_usb_substream *subs = rule->private;
 783         struct list_head *p;
 784         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 785         u64 fbits;
 786         u32 oldbits[2];
 787         int changed;
 788
 789         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 790         fbits = 0;
 791         list_for_each(p, &subs->fmt_list) {
 792                 struct audioformat *fp;
 793                 fp = list_entry(p, struct audioformat, list);
 794                 if (!hw_check_valid_format(subs, params, fp))
 795                         continue;
 796                 fbits |= fp->formats;
 797         }
 798
 799         oldbits[0] = fmt->bits[0];
 800         oldbits[1] = fmt->bits[1];
 801         fmt->bits[0] &= (u32)fbits;
 802         fmt->bits[1] &= (u32)(fbits >> 32);
 803         if (!fmt->bits[0] && !fmt->bits[1]) {
 804                 hwc_debug("  --> get empty\n");
 805                 return -EINVAL;
 806         }
 807         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 808         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 809         return changed;
 810 }
 811
 812 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 813                                struct snd_pcm_hw_rule *rule)
 814 {
 815         struct snd_usb_substream *subs = rule->private;
 816         struct audioformat *fp;
 817         struct snd_interval *it;
 818         unsigned char min_datainterval;
 819         unsigned int pmin;
 820         int changed;
 821
 822         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 823         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 824         min_datainterval = 0xff;
 825         list_for_each_entry(fp, &subs->fmt_list, list) {
 826                 if (!hw_check_valid_format(subs, params, fp))
 827                         continue;
 828                 min_datainterval = min(min_datainterval, fp->datainterval);
 829         }
 830         if (min_datainterval == 0xff) {
 831                 hwc_debug("  --> get empty\n");
 832                 it->empty = 1;
 833                 return -EINVAL;
 834         }
 835         pmin = 125 * (1 << min_datainterval);
 836         changed = 0;
 837         if (it->min < pmin) {
 838                 it->min = pmin;
 839                 it->openmin = 0;
 840                 changed = 1;
 841         }
 842         if (snd_interval_checkempty(it)) {
 843                 it->empty = 1;
 844                 return -EINVAL;
 845         }
 846         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 847         return changed;
 848 }
 849
 850 /*
 851  *  If the device supports unusual bit rates, does the request meet these?
 852  */
 853 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 854                                   struct snd_usb_substream *subs)
 855 {
 856         struct audioformat *fp;
 857         int *rate_list;
 858         int count = 0, needs_knot = 0;
 859         int err;
 860
 861         kfree(subs->rate_list.list);
 862         subs->rate_list.list = NULL;
 863
 864         list_for_each_entry(fp, &subs->fmt_list, list) {
 865                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 866                         return 0;
 867                 count += fp->nr_rates;
 868                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 869                         needs_knot = 1;
 870         }
 871         if (!needs_knot)
 872                 return 0;
 873
 874         subs->rate_list.list = rate_list =
 875                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 876         if (!subs->rate_list.list)
 877                 return -ENOMEM;
 878         subs->rate_list.count = count;
 879         subs->rate_list.mask = 0;
 880         count = 0;
 881         list_for_each_entry(fp, &subs->fmt_list, list) {
 882                 int i;
 883                 for (i = 0; i < fp->nr_rates; i++)
 884                         rate_list[count++] = fp->rate_table[i];
 885         }
 886         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 887                                          &subs->rate_list);
 888         if (err < 0)
 889                 return err;
 890
 891         return 0;
 892 }
 893
 894
 895 /*
 896  * set up the runtime hardware information.
 897  */
 898
 899 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 900 {
 901         struct list_head *p;
 902         unsigned int pt, ptmin;
 903         int param_period_time_if_needed;
 904         int err;
 905
 906         runtime->hw.formats = subs->formats;
 907
 908         runtime->hw.rate_min = 0x7fffffff;
 909         runtime->hw.rate_max = 0;
 910         runtime->hw.channels_min = 256;
 911         runtime->hw.channels_max = 0;
 912         runtime->hw.rates = 0;
 913         ptmin = UINT_MAX;
 914         /* check min/max rates and channels */
 915         list_for_each(p, &subs->fmt_list) {
 916                 struct audioformat *fp;
 917                 fp = list_entry(p, struct audioformat, list);
 918                 runtime->hw.rates |= fp->rates;
 919                 if (runtime->hw.rate_min > fp->rate_min)
 920                         runtime->hw.rate_min = fp->rate_min;
 921                 if (runtime->hw.rate_max < fp->rate_max)
 922                         runtime->hw.rate_max = fp->rate_max;
 923                 if (runtime->hw.channels_min > fp->channels)
 924                         runtime->hw.channels_min = fp->channels;
 925                 if (runtime->hw.channels_max < fp->channels)
 926                         runtime->hw.channels_max = fp->channels;
 927                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 928                         /* FIXME: there might be more than one audio formats... */
 929                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 930                                 fp->frame_size;
 931                 }
 932                 pt = 125 * (1 << fp->datainterval);
 933                 ptmin = min(ptmin, pt);
 934         }
 935         err = snd_usb_autoresume(subs->stream->chip);
 936         if (err < 0)
 937                 return err;
 938
 939         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 940         if (subs->speed == USB_SPEED_FULL)
 941                 /* full speed devices have fixed data packet interval */
 942                 ptmin = 1000;
 943         if (ptmin == 1000)
 944                 /* if period time doesn't go below 1 ms, no rules needed */
 945                 param_period_time_if_needed = -1;
 946         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 947                                      ptmin, UINT_MAX);
 948
 949         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 950                                        hw_rule_rate, subs,
 951                                        SNDRV_PCM_HW_PARAM_FORMAT,
 952                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 953                                        param_period_time_if_needed,
 954                                        -1)) < 0)
 955                 goto rep_err;
 956         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 957                                        hw_rule_channels, subs,
 958                                        SNDRV_PCM_HW_PARAM_FORMAT,
 959                                        SNDRV_PCM_HW_PARAM_RATE,
 960                                        param_period_time_if_needed,
 961                                        -1)) < 0)
 962                 goto rep_err;
 963         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 964                                        hw_rule_format, subs,
 965                                        SNDRV_PCM_HW_PARAM_RATE,
 966                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 967                                        param_period_time_if_needed,
 968                                        -1)) < 0)
 969                 goto rep_err;
 970         if (param_period_time_if_needed >= 0) {
 971                 err = snd_pcm_hw_rule_add(runtime, 0,
 972                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 973                                           hw_rule_period_time, subs,
 974                                           SNDRV_PCM_HW_PARAM_FORMAT,
 975                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 976                                           SNDRV_PCM_HW_PARAM_RATE,
 977                                           -1);
 978                 if (err < 0)
 979                         goto rep_err;
 980         }
 981         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 982                 goto rep_err;
 983         return 0;
 984
 985 rep_err:
 986         snd_usb_autosuspend(subs->stream->chip);
 987         return err;
 988 }
 989
 990 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 991 {
 992         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 993         struct snd_pcm_runtime *runtime = substream->runtime;
 994         struct snd_usb_substream *subs = &as->substream[direction];
 995
 996         subs->interface = -1;
 997         subs->altset_idx = 0;
 998         runtime->hw = snd_usb_hardware;
 999         runtime->private_data = subs;
1000         subs->pcm_substream = substream;
1001         /* runtime PM is also done there */
1002         return setup_hw_info(runtime, subs);
1003 }
1004
1005 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1006 {
1007         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1008         struct snd_usb_substream *subs = &as->substream[direction];
1009
1010         stop_endpoints(subs, false);
1011
1012         if (!as->chip->shutdown && subs->interface >= 0) {
1013                 usb_set_interface(subs->dev, subs->interface, 0);
1014                 subs->interface = -1;
1015         }
1016
1017         subs->pcm_substream = NULL;
1018         snd_usb_autosuspend(subs->stream->chip);
1019
1020         return 0;
1021 }
1022
1023 /* Since a URB can handle only a single linear buffer, we must use double
1024  * buffering when the data to be transferred overflows the buffer boundary.
1025  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1026  * for all URBs.
1027  */
1028 static void retire_capture_urb(struct snd_usb_substream *subs,
1029                                struct urb *urb)
1030 {
1031         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1032         unsigned int stride, frames, bytes, oldptr;
1033         int i, period_elapsed = 0;
1034         unsigned long flags;
1035         unsigned char *cp;
1036
1037         stride = runtime->frame_bits >> 3;
1038
1039         for (i = 0; i < urb->number_of_packets; i++) {
1040                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1041                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1042                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1043                         // continue;
1044                 }
1045                 bytes = urb->iso_frame_desc[i].actual_length;
1046                 frames = bytes / stride;
1047                 if (!subs->txfr_quirk)
1048                         bytes = frames * stride;
1049                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1050 #ifdef CONFIG_SND_DEBUG_VERBOSE
1051                         int oldbytes = bytes;
1052 #endif
1053                         bytes = frames * stride;
1054                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1055                                                         oldbytes, bytes);
1056                 }
1057                 /* update the current pointer */
1058                 spin_lock_irqsave(&subs->lock, flags);
1059                 oldptr = subs->hwptr_done;
1060                 subs->hwptr_done += bytes;
1061                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1062                         subs->hwptr_done -= runtime->buffer_size * stride;
1063                 frames = (bytes + (oldptr % stride)) / stride;
1064                 subs->transfer_done += frames;
1065                 if (subs->transfer_done >= runtime->period_size) {
1066                         subs->transfer_done -= runtime->period_size;
1067                         period_elapsed = 1;
1068                 }
1069                 spin_unlock_irqrestore(&subs->lock, flags);
1070                 /* copy a data chunk */
1071                 if (oldptr + bytes > runtime->buffer_size * stride) {
1072                         unsigned int bytes1 =
1073                                         runtime->buffer_size * stride - oldptr;
1074                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1075                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1076                 } else {
1077                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1078                 }
1079         }
1080
1081         if (period_elapsed)
1082                 snd_pcm_period_elapsed(subs->pcm_substream);
1083 }
1084
1085 static void prepare_playback_urb(struct snd_usb_substream *subs,
1086                                  struct urb *urb)
1087 {
1088         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1089         struct snd_usb_endpoint *ep = subs->data_endpoint;
1090         struct snd_urb_ctx *ctx = urb->context;
1091         unsigned int counts, frames, bytes;
1092         int i, stride, period_elapsed = 0;
1093         unsigned long flags;
1094
1095         stride = runtime->frame_bits >> 3;
1096
1097         frames = 0;
1098         urb->number_of_packets = 0;
1099         spin_lock_irqsave(&subs->lock, flags);
1100         for (i = 0; i < ctx->packets; i++) {
1101                 if (ctx->packet_size[i])
1102                         counts = ctx->packet_size[i];
1103                 else
1104                         counts = snd_usb_endpoint_next_packet_size(ep);
1105
1106                 /* set up descriptor */
1107                 urb->iso_frame_desc[i].offset = frames * stride;
1108                 urb->iso_frame_desc[i].length = counts * stride;
1109                 frames += counts;
1110                 urb->number_of_packets++;
1111                 subs->transfer_done += counts;
1112                 if (subs->transfer_done >= runtime->period_size) {
1113                         subs->transfer_done -= runtime->period_size;
1114                         period_elapsed = 1;
1115                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1116                                 if (subs->transfer_done > 0) {
1117                                         /* FIXME: fill-max mode is not
1118                                          * supported yet */
1119                                         frames -= subs->transfer_done;
1120                                         counts -= subs->transfer_done;
1121                                         urb->iso_frame_desc[i].length =
1122                                                 counts * stride;
1123                                         subs->transfer_done = 0;
1124                                 }
1125                                 i++;
1126                                 if (i < ctx->packets) {
1127                                         /* add a transfer delimiter */
1128                                         urb->iso_frame_desc[i].offset =
1129                                                 frames * stride;
1130                                         urb->iso_frame_desc[i].length = 0;
1131                                         urb->number_of_packets++;
1132                                 }
1133                                 break;
1134                         }
1135                 }
1136                 if (period_elapsed &&
1137                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1138                         break;
1139         }
1140         bytes = frames * stride;
1141         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1142                 /* err, the transferred area goes over buffer boundary. */
1143                 unsigned int bytes1 =
1144                         runtime->buffer_size * stride - subs->hwptr_done;
1145                 memcpy(urb->transfer_buffer,
1146                        runtime->dma_area + subs->hwptr_done, bytes1);
1147                 memcpy(urb->transfer_buffer + bytes1,
1148                        runtime->dma_area, bytes - bytes1);
1149         } else {
1150                 memcpy(urb->transfer_buffer,
1151                        runtime->dma_area + subs->hwptr_done, bytes);
1152         }
1153         subs->hwptr_done += bytes;
1154         if (subs->hwptr_done >= runtime->buffer_size * stride)
1155                 subs->hwptr_done -= runtime->buffer_size * stride;
1156
1157         /* update delay with exact number of samples queued */
1158         runtime->delay = subs->last_delay;
1159         runtime->delay += frames;
1160         subs->last_delay = runtime->delay;
1161
1162         /* realign last_frame_number */
1163         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1164         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1165
1166         spin_unlock_irqrestore(&subs->lock, flags);
1167         urb->transfer_buffer_length = bytes;
1168         if (period_elapsed)
1169                 snd_pcm_period_elapsed(subs->pcm_substream);
1170 }
1171
1172 /*
1173  * process after playback data complete
1174  * - decrease the delay count again
1175  */
1176 static void retire_playback_urb(struct snd_usb_substream *subs,
1177                                struct urb *urb)
1178 {
1179         unsigned long flags;
1180         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1181         int stride = runtime->frame_bits >> 3;
1182         int processed = urb->transfer_buffer_length / stride;
1183         int est_delay;
1184
1185         /* ignore the delay accounting when procssed=0 is given, i.e.
1186          * silent payloads are procssed before handling the actual data
1187          */
1188         if (!processed)
1189                 return;
1190
1191         spin_lock_irqsave(&subs->lock, flags);
1192         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1193         /* update delay with exact number of samples played */
1194         if (processed > subs->last_delay)
1195                 subs->last_delay = 0;
1196         else
1197                 subs->last_delay -= processed;
1198         runtime->delay = subs->last_delay;
1199
1200         /*
1201          * Report when delay estimate is off by more than 2ms.
1202          * The error should be lower than 2ms since the estimate relies
1203          * on two reads of a counter updated every ms.
1204          */
1205         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1206                 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1207                         est_delay, subs->last_delay);
1208
1209         spin_unlock_irqrestore(&subs->lock, flags);
1210 }
1211
1212 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1213 {
1214         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1215 }
1216
1217 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1218 {
1219         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1220 }
1221
1222 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1223 {
1224         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1225 }
1226
1227 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1228 {
1229         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1230 }
1231
1232 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1233                                               int cmd)
1234 {
1235         struct snd_usb_substream *subs = substream->runtime->private_data;
1236
1237         switch (cmd) {
1238         case SNDRV_PCM_TRIGGER_START:
1239         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1240                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1241                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1242                 subs->running = 1;
1243                 return 0;
1244         case SNDRV_PCM_TRIGGER_STOP:
1245                 stop_endpoints(subs, false);
1246                 subs->running = 0;
1247                 return 0;
1248         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1249                 subs->data_endpoint->prepare_data_urb = NULL;
1250                 subs->data_endpoint->retire_data_urb = NULL;
1251                 subs->running = 0;
1252                 return 0;
1253         }
1254
1255         return -EINVAL;
1256 }
1257
1258 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1259                                              int cmd)
1260 {
1261         int err;
1262         struct snd_usb_substream *subs = substream->runtime->private_data;
1263
1264         switch (cmd) {
1265         case SNDRV_PCM_TRIGGER_START:
1266                 err = start_endpoints(subs, false);
1267                 if (err < 0)
1268                         return err;
1269
1270                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1271                 subs->running = 1;
1272                 return 0;
1273         case SNDRV_PCM_TRIGGER_STOP:
1274                 stop_endpoints(subs, false);
1275                 subs->running = 0;
1276                 return 0;
1277         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1278                 subs->data_endpoint->retire_data_urb = NULL;
1279                 subs->running = 0;
1280                 return 0;
1281         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1282                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1283                 subs->running = 1;
1284                 return 0;
1285         }
1286
1287         return -EINVAL;
1288 }
1289
1290 static struct snd_pcm_ops snd_usb_playback_ops = {
1291         .open =         snd_usb_playback_open,
1292         .close =        snd_usb_playback_close,
1293         .ioctl =        snd_pcm_lib_ioctl,
1294         .hw_params =    snd_usb_hw_params,
1295         .hw_free =      snd_usb_hw_free,
1296         .prepare =      snd_usb_pcm_prepare,
1297         .trigger =      snd_usb_substream_playback_trigger,
1298         .pointer =      snd_usb_pcm_pointer,
1299         .page =         snd_pcm_lib_get_vmalloc_page,
1300         .mmap =         snd_pcm_lib_mmap_vmalloc,
1301 };
1302
1303 static struct snd_pcm_ops snd_usb_capture_ops = {
1304         .open =         snd_usb_capture_open,
1305         .close =        snd_usb_capture_close,
1306         .ioctl =        snd_pcm_lib_ioctl,
1307         .hw_params =    snd_usb_hw_params,
1308         .hw_free =      snd_usb_hw_free,
1309         .prepare =      snd_usb_pcm_prepare,
1310         .trigger =      snd_usb_substream_capture_trigger,
1311         .pointer =      snd_usb_pcm_pointer,
1312         .page =         snd_pcm_lib_get_vmalloc_page,
1313         .mmap =         snd_pcm_lib_mmap_vmalloc,
1314 };
1315
1316 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1317 {
1318         snd_pcm_set_ops(pcm, stream,
1319                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1320                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1321 }