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)
  86 {
  87         struct list_head *p;
  88         struct audioformat *found = NULL;
  89         int cur_attr = 0, attr;
  90
  91         list_for_each(p, &subs->fmt_list) {
  92                 struct audioformat *fp;
  93                 fp = list_entry(p, struct audioformat, list);
  94                 if (!(fp->formats & (1uLL << subs->pcm_format)))
  95                         continue;
  96                 if (fp->channels != subs->channels)
  97                         continue;
  98                 if (subs->cur_rate < fp->rate_min ||
  99                     subs->cur_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] == subs->cur_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  * configure endpoint params
 440  *
 441  * called  during initial setup and upon resume
 442  */
 443 static int configure_endpoint(struct snd_usb_substream *subs)
 444 {
 445         int ret;
 446
 447         mutex_lock(&subs->stream->chip->shutdown_mutex);
 448         /* format changed */
 449         stop_endpoints(subs, 0, 0, 0);
 450         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 451                                           subs->pcm_format,
 452                                           subs->channels,
 453                                           subs->period_bytes,
 454                                           subs->cur_rate,
 455                                           subs->cur_audiofmt,
 456                                           subs->sync_endpoint);
 457         if (ret < 0)
 458                 goto unlock;
 459
 460         if (subs->sync_endpoint)
 461                 ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 462                                                   subs->pcm_format,
 463                                                   subs->channels,
 464                                                   subs->period_bytes,
 465                                                   subs->cur_rate,
 466                                                   subs->cur_audiofmt,
 467                                                   NULL);
 468
 469 unlock:
 470         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 471         return ret;
 472 }
 473
 474 /*
 475  * hw_params callback
 476  *
 477  * allocate a buffer and set the given audio format.
 478  *
 479  * so far we use a physically linear buffer although packetize transfer
 480  * doesn't need a continuous area.
 481  * if sg buffer is supported on the later version of alsa, we'll follow
 482  * that.
 483  */
 484 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 485                              struct snd_pcm_hw_params *hw_params)
 486 {
 487         struct snd_usb_substream *subs = substream->runtime->private_data;
 488         struct audioformat *fmt;
 489         int ret;
 490
 491         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 492                                                params_buffer_bytes(hw_params));
 493         if (ret < 0)
 494                 return ret;
 495
 496         subs->pcm_format = params_format(hw_params);
 497         subs->period_bytes = params_period_bytes(hw_params);
 498         subs->channels = params_channels(hw_params);
 499         subs->cur_rate = params_rate(hw_params);
 500
 501         fmt = find_format(subs);
 502         if (!fmt) {
 503                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 504                            subs->pcm_format, subs->cur_rate, subs->channels);
 505                 return -EINVAL;
 506         }
 507
 508         if ((ret = set_format(subs, fmt)) < 0)
 509                 return ret;
 510
 511         subs->interface = fmt->iface;
 512         subs->altset_idx = fmt->altset_idx;
 513         subs->need_setup_ep = true;
 514
 515         return 0;
 516 }
 517
 518 /*
 519  * hw_free callback
 520  *
 521  * reset the audio format and release the buffer
 522  */
 523 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 524 {
 525         struct snd_usb_substream *subs = substream->runtime->private_data;
 526
 527         subs->cur_audiofmt = NULL;
 528         subs->cur_rate = 0;
 529         subs->period_bytes = 0;
 530         mutex_lock(&subs->stream->chip->shutdown_mutex);
 531         stop_endpoints(subs, 0, 1, 1);
 532         deactivate_endpoints(subs);
 533         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 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         if (snd_BUG_ON(!subs->data_endpoint))
 556                 return -EIO;
 557
 558         ret = set_format(subs, subs->cur_audiofmt);
 559         if (ret < 0)
 560                 return ret;
 561
 562         iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 563         alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 564         ret = snd_usb_init_sample_rate(subs->stream->chip,
 565                                        subs->cur_audiofmt->iface,
 566                                        alts,
 567                                        subs->cur_audiofmt,
 568                                        subs->cur_rate);
 569         if (ret < 0)
 570                 return ret;
 571
 572         if (subs->need_setup_ep) {
 573                 ret = configure_endpoint(subs);
 574                 if (ret < 0)
 575                         return ret;
 576                 subs->need_setup_ep = false;
 577         }
 578
 579         /* some unit conversions in runtime */
 580         subs->data_endpoint->maxframesize =
 581                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 582         subs->data_endpoint->curframesize =
 583                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 584
 585         /* reset the pointer */
 586         subs->hwptr_done = 0;
 587         subs->transfer_done = 0;
 588         subs->last_delay = 0;
 589         subs->last_frame_number = 0;
 590         runtime->delay = 0;
 591
 592         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 593          * updates for all URBs would happen at the same time when starting */
 594         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 595                 return start_endpoints(subs, 1);
 596
 597         return 0;
 598 }
 599
 600 static struct snd_pcm_hardware snd_usb_hardware =
 601 {
 602         .info =                 SNDRV_PCM_INFO_MMAP |
 603                                 SNDRV_PCM_INFO_MMAP_VALID |
 604                                 SNDRV_PCM_INFO_BATCH |
 605                                 SNDRV_PCM_INFO_INTERLEAVED |
 606                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 607                                 SNDRV_PCM_INFO_PAUSE,
 608         .buffer_bytes_max =     1024 * 1024,
 609         .period_bytes_min =     64,
 610         .period_bytes_max =     512 * 1024,
 611         .periods_min =          2,
 612         .periods_max =          1024,
 613 };
 614
 615 static int hw_check_valid_format(struct snd_usb_substream *subs,
 616                                  struct snd_pcm_hw_params *params,
 617                                  struct audioformat *fp)
 618 {
 619         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 620         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 621         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 622         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 623         struct snd_mask check_fmts;
 624         unsigned int ptime;
 625
 626         /* check the format */
 627         snd_mask_none(&check_fmts);
 628         check_fmts.bits[0] = (u32)fp->formats;
 629         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 630         snd_mask_intersect(&check_fmts, fmts);
 631         if (snd_mask_empty(&check_fmts)) {
 632                 hwc_debug("   > check: no supported format %d\n", fp->format);
 633                 return 0;
 634         }
 635         /* check the channels */
 636         if (fp->channels < ct->min || fp->channels > ct->max) {
 637                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 638                 return 0;
 639         }
 640         /* check the rate is within the range */
 641         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 642                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 643                 return 0;
 644         }
 645         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 646                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 647                 return 0;
 648         }
 649         /* check whether the period time is >= the data packet interval */
 650         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 651                 ptime = 125 * (1 << fp->datainterval);
 652                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 653                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 654                         return 0;
 655                 }
 656         }
 657         return 1;
 658 }
 659
 660 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 661                         struct snd_pcm_hw_rule *rule)
 662 {
 663         struct snd_usb_substream *subs = rule->private;
 664         struct list_head *p;
 665         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 666         unsigned int rmin, rmax;
 667         int changed;
 668
 669         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 670         changed = 0;
 671         rmin = rmax = 0;
 672         list_for_each(p, &subs->fmt_list) {
 673                 struct audioformat *fp;
 674                 fp = list_entry(p, struct audioformat, list);
 675                 if (!hw_check_valid_format(subs, params, fp))
 676                         continue;
 677                 if (changed++) {
 678                         if (rmin > fp->rate_min)
 679                                 rmin = fp->rate_min;
 680                         if (rmax < fp->rate_max)
 681                                 rmax = fp->rate_max;
 682                 } else {
 683                         rmin = fp->rate_min;
 684                         rmax = fp->rate_max;
 685                 }
 686         }
 687
 688         if (!changed) {
 689                 hwc_debug("  --> get empty\n");
 690                 it->empty = 1;
 691                 return -EINVAL;
 692         }
 693
 694         changed = 0;
 695         if (it->min < rmin) {
 696                 it->min = rmin;
 697                 it->openmin = 0;
 698                 changed = 1;
 699         }
 700         if (it->max > rmax) {
 701                 it->max = rmax;
 702                 it->openmax = 0;
 703                 changed = 1;
 704         }
 705         if (snd_interval_checkempty(it)) {
 706                 it->empty = 1;
 707                 return -EINVAL;
 708         }
 709         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 710         return changed;
 711 }
 712
 713
 714 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 715                             struct snd_pcm_hw_rule *rule)
 716 {
 717         struct snd_usb_substream *subs = rule->private;
 718         struct list_head *p;
 719         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 720         unsigned int rmin, rmax;
 721         int changed;
 722
 723         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 724         changed = 0;
 725         rmin = rmax = 0;
 726         list_for_each(p, &subs->fmt_list) {
 727                 struct audioformat *fp;
 728                 fp = list_entry(p, struct audioformat, list);
 729                 if (!hw_check_valid_format(subs, params, fp))
 730                         continue;
 731                 if (changed++) {
 732                         if (rmin > fp->channels)
 733                                 rmin = fp->channels;
 734                         if (rmax < fp->channels)
 735                                 rmax = fp->channels;
 736                 } else {
 737                         rmin = fp->channels;
 738                         rmax = fp->channels;
 739                 }
 740         }
 741
 742         if (!changed) {
 743                 hwc_debug("  --> get empty\n");
 744                 it->empty = 1;
 745                 return -EINVAL;
 746         }
 747
 748         changed = 0;
 749         if (it->min < rmin) {
 750                 it->min = rmin;
 751                 it->openmin = 0;
 752                 changed = 1;
 753         }
 754         if (it->max > rmax) {
 755                 it->max = rmax;
 756                 it->openmax = 0;
 757                 changed = 1;
 758         }
 759         if (snd_interval_checkempty(it)) {
 760                 it->empty = 1;
 761                 return -EINVAL;
 762         }
 763         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 764         return changed;
 765 }
 766
 767 static int hw_rule_format(struct snd_pcm_hw_params *params,
 768                           struct snd_pcm_hw_rule *rule)
 769 {
 770         struct snd_usb_substream *subs = rule->private;
 771         struct list_head *p;
 772         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 773         u64 fbits;
 774         u32 oldbits[2];
 775         int changed;
 776
 777         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 778         fbits = 0;
 779         list_for_each(p, &subs->fmt_list) {
 780                 struct audioformat *fp;
 781                 fp = list_entry(p, struct audioformat, list);
 782                 if (!hw_check_valid_format(subs, params, fp))
 783                         continue;
 784                 fbits |= fp->formats;
 785         }
 786
 787         oldbits[0] = fmt->bits[0];
 788         oldbits[1] = fmt->bits[1];
 789         fmt->bits[0] &= (u32)fbits;
 790         fmt->bits[1] &= (u32)(fbits >> 32);
 791         if (!fmt->bits[0] && !fmt->bits[1]) {
 792                 hwc_debug("  --> get empty\n");
 793                 return -EINVAL;
 794         }
 795         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 796         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 797         return changed;
 798 }
 799
 800 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 801                                struct snd_pcm_hw_rule *rule)
 802 {
 803         struct snd_usb_substream *subs = rule->private;
 804         struct audioformat *fp;
 805         struct snd_interval *it;
 806         unsigned char min_datainterval;
 807         unsigned int pmin;
 808         int changed;
 809
 810         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 811         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 812         min_datainterval = 0xff;
 813         list_for_each_entry(fp, &subs->fmt_list, list) {
 814                 if (!hw_check_valid_format(subs, params, fp))
 815                         continue;
 816                 min_datainterval = min(min_datainterval, fp->datainterval);
 817         }
 818         if (min_datainterval == 0xff) {
 819                 hwc_debug("  --> get empty\n");
 820                 it->empty = 1;
 821                 return -EINVAL;
 822         }
 823         pmin = 125 * (1 << min_datainterval);
 824         changed = 0;
 825         if (it->min < pmin) {
 826                 it->min = pmin;
 827                 it->openmin = 0;
 828                 changed = 1;
 829         }
 830         if (snd_interval_checkempty(it)) {
 831                 it->empty = 1;
 832                 return -EINVAL;
 833         }
 834         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 835         return changed;
 836 }
 837
 838 /*
 839  *  If the device supports unusual bit rates, does the request meet these?
 840  */
 841 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 842                                   struct snd_usb_substream *subs)
 843 {
 844         struct audioformat *fp;
 845         int *rate_list;
 846         int count = 0, needs_knot = 0;
 847         int err;
 848
 849         kfree(subs->rate_list.list);
 850         subs->rate_list.list = NULL;
 851
 852         list_for_each_entry(fp, &subs->fmt_list, list) {
 853                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 854                         return 0;
 855                 count += fp->nr_rates;
 856                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 857                         needs_knot = 1;
 858         }
 859         if (!needs_knot)
 860                 return 0;
 861
 862         subs->rate_list.list = rate_list =
 863                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 864         if (!subs->rate_list.list)
 865                 return -ENOMEM;
 866         subs->rate_list.count = count;
 867         subs->rate_list.mask = 0;
 868         count = 0;
 869         list_for_each_entry(fp, &subs->fmt_list, list) {
 870                 int i;
 871                 for (i = 0; i < fp->nr_rates; i++)
 872                         rate_list[count++] = fp->rate_table[i];
 873         }
 874         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 875                                          &subs->rate_list);
 876         if (err < 0)
 877                 return err;
 878
 879         return 0;
 880 }
 881
 882
 883 /*
 884  * set up the runtime hardware information.
 885  */
 886
 887 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 888 {
 889         struct list_head *p;
 890         unsigned int pt, ptmin;
 891         int param_period_time_if_needed;
 892         int err;
 893
 894         runtime->hw.formats = subs->formats;
 895
 896         runtime->hw.rate_min = 0x7fffffff;
 897         runtime->hw.rate_max = 0;
 898         runtime->hw.channels_min = 256;
 899         runtime->hw.channels_max = 0;
 900         runtime->hw.rates = 0;
 901         ptmin = UINT_MAX;
 902         /* check min/max rates and channels */
 903         list_for_each(p, &subs->fmt_list) {
 904                 struct audioformat *fp;
 905                 fp = list_entry(p, struct audioformat, list);
 906                 runtime->hw.rates |= fp->rates;
 907                 if (runtime->hw.rate_min > fp->rate_min)
 908                         runtime->hw.rate_min = fp->rate_min;
 909                 if (runtime->hw.rate_max < fp->rate_max)
 910                         runtime->hw.rate_max = fp->rate_max;
 911                 if (runtime->hw.channels_min > fp->channels)
 912                         runtime->hw.channels_min = fp->channels;
 913                 if (runtime->hw.channels_max < fp->channels)
 914                         runtime->hw.channels_max = fp->channels;
 915                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 916                         /* FIXME: there might be more than one audio formats... */
 917                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 918                                 fp->frame_size;
 919                 }
 920                 pt = 125 * (1 << fp->datainterval);
 921                 ptmin = min(ptmin, pt);
 922         }
 923         err = snd_usb_autoresume(subs->stream->chip);
 924         if (err < 0)
 925                 return err;
 926
 927         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 928         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 929                 /* full speed devices have fixed data packet interval */
 930                 ptmin = 1000;
 931         if (ptmin == 1000)
 932                 /* if period time doesn't go below 1 ms, no rules needed */
 933                 param_period_time_if_needed = -1;
 934         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 935                                      ptmin, UINT_MAX);
 936
 937         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 938                                        hw_rule_rate, subs,
 939                                        SNDRV_PCM_HW_PARAM_FORMAT,
 940                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 941                                        param_period_time_if_needed,
 942                                        -1)) < 0)
 943                 goto rep_err;
 944         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 945                                        hw_rule_channels, subs,
 946                                        SNDRV_PCM_HW_PARAM_FORMAT,
 947                                        SNDRV_PCM_HW_PARAM_RATE,
 948                                        param_period_time_if_needed,
 949                                        -1)) < 0)
 950                 goto rep_err;
 951         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 952                                        hw_rule_format, subs,
 953                                        SNDRV_PCM_HW_PARAM_RATE,
 954                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 955                                        param_period_time_if_needed,
 956                                        -1)) < 0)
 957                 goto rep_err;
 958         if (param_period_time_if_needed >= 0) {
 959                 err = snd_pcm_hw_rule_add(runtime, 0,
 960                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 961                                           hw_rule_period_time, subs,
 962                                           SNDRV_PCM_HW_PARAM_FORMAT,
 963                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 964                                           SNDRV_PCM_HW_PARAM_RATE,
 965                                           -1);
 966                 if (err < 0)
 967                         goto rep_err;
 968         }
 969         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 970                 goto rep_err;
 971         return 0;
 972
 973 rep_err:
 974         snd_usb_autosuspend(subs->stream->chip);
 975         return err;
 976 }
 977
 978 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 979 {
 980         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 981         struct snd_pcm_runtime *runtime = substream->runtime;
 982         struct snd_usb_substream *subs = &as->substream[direction];
 983
 984         subs->interface = -1;
 985         subs->altset_idx = 0;
 986         runtime->hw = snd_usb_hardware;
 987         runtime->private_data = subs;
 988         subs->pcm_substream = substream;
 989         /* runtime PM is also done there */
 990         return setup_hw_info(runtime, subs);
 991 }
 992
 993 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 994 {
 995         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 996         struct snd_usb_substream *subs = &as->substream[direction];
 997
 998         stop_endpoints(subs, 0, 0, 0);
 999
1000         if (!as->chip->shutdown && subs->interface >= 0) {
1001                 usb_set_interface(subs->dev, subs->interface, 0);
1002                 subs->interface = -1;
1003         }
1004
1005         subs->pcm_substream = NULL;
1006         snd_usb_autosuspend(subs->stream->chip);
1007
1008         return 0;
1009 }
1010
1011 /* Since a URB can handle only a single linear buffer, we must use double
1012  * buffering when the data to be transferred overflows the buffer boundary.
1013  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1014  * for all URBs.
1015  */
1016 static void retire_capture_urb(struct snd_usb_substream *subs,
1017                                struct urb *urb)
1018 {
1019         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1020         unsigned int stride, frames, bytes, oldptr;
1021         int i, period_elapsed = 0;
1022         unsigned long flags;
1023         unsigned char *cp;
1024
1025         stride = runtime->frame_bits >> 3;
1026
1027         for (i = 0; i < urb->number_of_packets; i++) {
1028                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1029                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1030                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1031                         // continue;
1032                 }
1033                 bytes = urb->iso_frame_desc[i].actual_length;
1034                 frames = bytes / stride;
1035                 if (!subs->txfr_quirk)
1036                         bytes = frames * stride;
1037                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1038 #ifdef CONFIG_SND_DEBUG_VERBOSE
1039                         int oldbytes = bytes;
1040 #endif
1041                         bytes = frames * stride;
1042                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1043                                                         oldbytes, bytes);
1044                 }
1045                 /* update the current pointer */
1046                 spin_lock_irqsave(&subs->lock, flags);
1047                 oldptr = subs->hwptr_done;
1048                 subs->hwptr_done += bytes;
1049                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1050                         subs->hwptr_done -= runtime->buffer_size * stride;
1051                 frames = (bytes + (oldptr % stride)) / stride;
1052                 subs->transfer_done += frames;
1053                 if (subs->transfer_done >= runtime->period_size) {
1054                         subs->transfer_done -= runtime->period_size;
1055                         period_elapsed = 1;
1056                 }
1057                 spin_unlock_irqrestore(&subs->lock, flags);
1058                 /* copy a data chunk */
1059                 if (oldptr + bytes > runtime->buffer_size * stride) {
1060                         unsigned int bytes1 =
1061                                         runtime->buffer_size * stride - oldptr;
1062                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1063                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1064                 } else {
1065                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1066                 }
1067         }
1068
1069         if (period_elapsed)
1070                 snd_pcm_period_elapsed(subs->pcm_substream);
1071 }
1072
1073 static void prepare_playback_urb(struct snd_usb_substream *subs,
1074                                  struct urb *urb)
1075 {
1076         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1077         struct snd_usb_endpoint *ep = subs->data_endpoint;
1078         struct snd_urb_ctx *ctx = urb->context;
1079         unsigned int counts, frames, bytes;
1080         int i, stride, period_elapsed = 0;
1081         unsigned long flags;
1082
1083         stride = runtime->frame_bits >> 3;
1084
1085         frames = 0;
1086         urb->number_of_packets = 0;
1087         spin_lock_irqsave(&subs->lock, flags);
1088         for (i = 0; i < ctx->packets; i++) {
1089                 if (ctx->packet_size[i])
1090                         counts = ctx->packet_size[i];
1091                 else
1092                         counts = snd_usb_endpoint_next_packet_size(ep);
1093
1094                 /* set up descriptor */
1095                 urb->iso_frame_desc[i].offset = frames * stride;
1096                 urb->iso_frame_desc[i].length = counts * stride;
1097                 frames += counts;
1098                 urb->number_of_packets++;
1099                 subs->transfer_done += counts;
1100                 if (subs->transfer_done >= runtime->period_size) {
1101                         subs->transfer_done -= runtime->period_size;
1102                         period_elapsed = 1;
1103                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1104                                 if (subs->transfer_done > 0) {
1105                                         /* FIXME: fill-max mode is not
1106                                          * supported yet */
1107                                         frames -= subs->transfer_done;
1108                                         counts -= subs->transfer_done;
1109                                         urb->iso_frame_desc[i].length =
1110                                                 counts * stride;
1111                                         subs->transfer_done = 0;
1112                                 }
1113                                 i++;
1114                                 if (i < ctx->packets) {
1115                                         /* add a transfer delimiter */
1116                                         urb->iso_frame_desc[i].offset =
1117                                                 frames * stride;
1118                                         urb->iso_frame_desc[i].length = 0;
1119                                         urb->number_of_packets++;
1120                                 }
1121                                 break;
1122                         }
1123                 }
1124                 if (period_elapsed &&
1125                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1126                         break;
1127         }
1128         bytes = frames * stride;
1129         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1130                 /* err, the transferred area goes over buffer boundary. */
1131                 unsigned int bytes1 =
1132                         runtime->buffer_size * stride - subs->hwptr_done;
1133                 memcpy(urb->transfer_buffer,
1134                        runtime->dma_area + subs->hwptr_done, bytes1);
1135                 memcpy(urb->transfer_buffer + bytes1,
1136                        runtime->dma_area, bytes - bytes1);
1137         } else {
1138                 memcpy(urb->transfer_buffer,
1139                        runtime->dma_area + subs->hwptr_done, bytes);
1140         }
1141         subs->hwptr_done += bytes;
1142         if (subs->hwptr_done >= runtime->buffer_size * stride)
1143                 subs->hwptr_done -= runtime->buffer_size * stride;
1144
1145         /* update delay with exact number of samples queued */
1146         runtime->delay = subs->last_delay;
1147         runtime->delay += frames;
1148         subs->last_delay = runtime->delay;
1149
1150         /* realign last_frame_number */
1151         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1152         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1153
1154         spin_unlock_irqrestore(&subs->lock, flags);
1155         urb->transfer_buffer_length = bytes;
1156         if (period_elapsed)
1157                 snd_pcm_period_elapsed(subs->pcm_substream);
1158 }
1159
1160 /*
1161  * process after playback data complete
1162  * - decrease the delay count again
1163  */
1164 static void retire_playback_urb(struct snd_usb_substream *subs,
1165                                struct urb *urb)
1166 {
1167         unsigned long flags;
1168         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1169         int stride = runtime->frame_bits >> 3;
1170         int processed = urb->transfer_buffer_length / stride;
1171         int est_delay;
1172
1173         /* ignore the delay accounting when procssed=0 is given, i.e.
1174          * silent payloads are procssed before handling the actual data
1175          */
1176         if (!processed)
1177                 return;
1178
1179         spin_lock_irqsave(&subs->lock, flags);
1180         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1181         /* update delay with exact number of samples played */
1182         if (processed > subs->last_delay)
1183                 subs->last_delay = 0;
1184         else
1185                 subs->last_delay -= processed;
1186         runtime->delay = subs->last_delay;
1187
1188         /*
1189          * Report when delay estimate is off by more than 2ms.
1190          * The error should be lower than 2ms since the estimate relies
1191          * on two reads of a counter updated every ms.
1192          */
1193         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1194                 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1195                         est_delay, subs->last_delay);
1196
1197         spin_unlock_irqrestore(&subs->lock, flags);
1198 }
1199
1200 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1201 {
1202         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1203 }
1204
1205 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1206 {
1207         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1208 }
1209
1210 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1211 {
1212         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1213 }
1214
1215 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1216 {
1217         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1218 }
1219
1220 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1221                                               int cmd)
1222 {
1223         struct snd_usb_substream *subs = substream->runtime->private_data;
1224
1225         switch (cmd) {
1226         case SNDRV_PCM_TRIGGER_START:
1227         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1228                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1229                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1230                 subs->running = 1;
1231                 return 0;
1232         case SNDRV_PCM_TRIGGER_STOP:
1233                 stop_endpoints(subs, 0, 0, 0);
1234                 subs->running = 0;
1235                 return 0;
1236         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1237                 subs->data_endpoint->prepare_data_urb = NULL;
1238                 subs->data_endpoint->retire_data_urb = NULL;
1239                 subs->running = 0;
1240                 return 0;
1241         }
1242
1243         return -EINVAL;
1244 }
1245
1246 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1247                                              int cmd)
1248 {
1249         int err;
1250         struct snd_usb_substream *subs = substream->runtime->private_data;
1251
1252         switch (cmd) {
1253         case SNDRV_PCM_TRIGGER_START:
1254                 err = start_endpoints(subs, 0);
1255                 if (err < 0)
1256                         return err;
1257
1258                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1259                 subs->running = 1;
1260                 return 0;
1261         case SNDRV_PCM_TRIGGER_STOP:
1262                 stop_endpoints(subs, 0, 0, 0);
1263                 subs->running = 0;
1264                 return 0;
1265         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1266                 subs->data_endpoint->retire_data_urb = NULL;
1267                 subs->running = 0;
1268                 return 0;
1269         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1270                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1271                 subs->running = 1;
1272                 return 0;
1273         }
1274
1275         return -EINVAL;
1276 }
1277
1278 static struct snd_pcm_ops snd_usb_playback_ops = {
1279         .open =         snd_usb_playback_open,
1280         .close =        snd_usb_playback_close,
1281         .ioctl =        snd_pcm_lib_ioctl,
1282         .hw_params =    snd_usb_hw_params,
1283         .hw_free =      snd_usb_hw_free,
1284         .prepare =      snd_usb_pcm_prepare,
1285         .trigger =      snd_usb_substream_playback_trigger,
1286         .pointer =      snd_usb_pcm_pointer,
1287         .page =         snd_pcm_lib_get_vmalloc_page,
1288         .mmap =         snd_pcm_lib_mmap_vmalloc,
1289 };
1290
1291 static struct snd_pcm_ops snd_usb_capture_ops = {
1292         .open =         snd_usb_capture_open,
1293         .close =        snd_usb_capture_close,
1294         .ioctl =        snd_pcm_lib_ioctl,
1295         .hw_params =    snd_usb_hw_params,
1296         .hw_free =      snd_usb_hw_free,
1297         .prepare =      snd_usb_pcm_prepare,
1298         .trigger =      snd_usb_substream_capture_trigger,
1299         .pointer =      snd_usb_pcm_pointer,
1300         .page =         snd_pcm_lib_get_vmalloc_page,
1301         .mmap =         snd_pcm_lib_mmap_vmalloc,
1302 };
1303
1304 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1305 {
1306         snd_pcm_set_ops(pcm, stream,
1307                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1308                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1309 }