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         if (!subs->last_delay)
  50                 return 0; /* short path */
  51
  52         current_frame_number = usb_get_current_frame_number(subs->dev);
  53         /*
  54          * HCD implementations use different widths, use lower 8 bits.
  55          * The delay will be managed up to 256ms, which is more than
  56          * enough
  57          */
  58         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  59
  60         /* Approximation based on number of samples per USB frame (ms),
  61            some truncation for 44.1 but the estimate is good enough */
  62         est_delay =  subs->last_delay - (frame_diff * rate / 1000);
  63         if (est_delay < 0)
  64                 est_delay = 0;
  65         return est_delay;
  66 }
  67
  68 /*
  69  * return the current pcm pointer.  just based on the hwptr_done value.
  70  */
  71 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  72 {
  73         struct snd_usb_substream *subs;
  74         unsigned int hwptr_done;
  75
  76         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  77         if (subs->stream->chip->shutdown)
  78                 return SNDRV_PCM_POS_XRUN;
  79         spin_lock(&subs->lock);
  80         hwptr_done = subs->hwptr_done;
  81         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  82                 substream->runtime->delay = snd_usb_pcm_delay(subs,
  83                                                 substream->runtime->rate);
  84         spin_unlock(&subs->lock);
  85         return hwptr_done / (substream->runtime->frame_bits >> 3);
  86 }
  87
  88 /*
  89  * find a matching audio format
  90  */
  91 static struct audioformat *find_format(struct snd_usb_substream *subs)
  92 {
  93         struct list_head *p;
  94         struct audioformat *found = NULL;
  95         int cur_attr = 0, attr;
  96
  97         list_for_each(p, &subs->fmt_list) {
  98                 struct audioformat *fp;
  99                 fp = list_entry(p, struct audioformat, list);
 100                 if (!(fp->formats & (1uLL << subs->pcm_format)))
 101                         continue;
 102                 if (fp->channels != subs->channels)
 103                         continue;
 104                 if (subs->cur_rate < fp->rate_min ||
 105                     subs->cur_rate > fp->rate_max)
 106                         continue;
 107                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 108                         unsigned int i;
 109                         for (i = 0; i < fp->nr_rates; i++)
 110                                 if (fp->rate_table[i] == subs->cur_rate)
 111                                         break;
 112                         if (i >= fp->nr_rates)
 113                                 continue;
 114                 }
 115                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 116                 if (! found) {
 117                         found = fp;
 118                         cur_attr = attr;
 119                         continue;
 120                 }
 121                 /* avoid async out and adaptive in if the other method
 122                  * supports the same format.
 123                  * this is a workaround for the case like
 124                  * M-audio audiophile USB.
 125                  */
 126                 if (attr != cur_attr) {
 127                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 128                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 129                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 130                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 131                                 continue;
 132                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 133                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 134                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 135                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 136                                 found = fp;
 137                                 cur_attr = attr;
 138                                 continue;
 139                         }
 140                 }
 141                 /* find the format with the largest max. packet size */
 142                 if (fp->maxpacksize > found->maxpacksize) {
 143                         found = fp;
 144                         cur_attr = attr;
 145                 }
 146         }
 147         return found;
 148 }
 149
 150 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 151                          struct usb_host_interface *alts,
 152                          struct audioformat *fmt)
 153 {
 154         struct usb_device *dev = chip->dev;
 155         unsigned int ep;
 156         unsigned char data[1];
 157         int err;
 158
 159         ep = get_endpoint(alts, 0)->bEndpointAddress;
 160
 161         data[0] = 1;
 162         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 163                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 164                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 165                                    data, sizeof(data))) < 0) {
 166                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 167                            dev->devnum, iface, ep);
 168                 return err;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 175                          struct usb_host_interface *alts,
 176                          struct audioformat *fmt)
 177 {
 178         struct usb_device *dev = chip->dev;
 179         unsigned char data[1];
 180         int err;
 181
 182         data[0] = 1;
 183         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 184                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 185                                    UAC2_EP_CS_PITCH << 8, 0,
 186                                    data, sizeof(data))) < 0) {
 187                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 188                            dev->devnum, iface, fmt->altsetting);
 189                 return err;
 190         }
 191
 192         return 0;
 193 }
 194
 195 /*
 196  * initialize the pitch control and sample rate
 197  */
 198 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 199                        struct usb_host_interface *alts,
 200                        struct audioformat *fmt)
 201 {
 202         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 203
 204         /* if endpoint doesn't have pitch control, bail out */
 205         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 206                 return 0;
 207
 208         switch (altsd->bInterfaceProtocol) {
 209         case UAC_VERSION_1:
 210         default:
 211                 return init_pitch_v1(chip, iface, alts, fmt);
 212
 213         case UAC_VERSION_2:
 214                 return init_pitch_v2(chip, iface, alts, fmt);
 215         }
 216 }
 217
 218 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
 219 {
 220         int err;
 221
 222         if (!subs->data_endpoint)
 223                 return -EINVAL;
 224
 225         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 226                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 227
 228                 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
 229
 230                 ep->data_subs = subs;
 231                 err = snd_usb_endpoint_start(ep, can_sleep);
 232                 if (err < 0) {
 233                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 234                         return err;
 235                 }
 236         }
 237
 238         if (subs->sync_endpoint &&
 239             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 240                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 241
 242                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 243                     subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
 244                         err = usb_set_interface(subs->dev,
 245                                                 subs->sync_endpoint->iface,
 246                                                 subs->sync_endpoint->alt_idx);
 247                         if (err < 0) {
 248                                 snd_printk(KERN_ERR
 249                                            "%d:%d:%d: cannot set interface (%d)\n",
 250                                            subs->dev->devnum,
 251                                            subs->sync_endpoint->iface,
 252                                            subs->sync_endpoint->alt_idx, err);
 253                                 return -EIO;
 254                         }
 255                 }
 256
 257                 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
 258
 259                 ep->sync_slave = subs->data_endpoint;
 260                 err = snd_usb_endpoint_start(ep, can_sleep);
 261                 if (err < 0) {
 262                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 263                         return err;
 264                 }
 265         }
 266
 267         return 0;
 268 }
 269
 270 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 271 {
 272         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 273                 snd_usb_endpoint_stop(subs->sync_endpoint);
 274
 275         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 276                 snd_usb_endpoint_stop(subs->data_endpoint);
 277
 278         if (wait) {
 279                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 280                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 281         }
 282 }
 283
 284 static int deactivate_endpoints(struct snd_usb_substream *subs)
 285 {
 286         int reta, retb;
 287
 288         reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
 289         retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
 290
 291         if (reta < 0)
 292                 return reta;
 293
 294         if (retb < 0)
 295                 return retb;
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * find a matching format and set up the interface
 302  */
 303 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 304 {
 305         struct usb_device *dev = subs->dev;
 306         struct usb_host_interface *alts;
 307         struct usb_interface_descriptor *altsd;
 308         struct usb_interface *iface;
 309         unsigned int ep, attr;
 310         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 311         int err, implicit_fb = 0;
 312
 313         iface = usb_ifnum_to_if(dev, fmt->iface);
 314         if (WARN_ON(!iface))
 315                 return -EINVAL;
 316         alts = &iface->altsetting[fmt->altset_idx];
 317         altsd = get_iface_desc(alts);
 318         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 319                 return -EINVAL;
 320
 321         if (fmt == subs->cur_audiofmt)
 322                 return 0;
 323
 324         /* close the old interface */
 325         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 326                 err = usb_set_interface(subs->dev, subs->interface, 0);
 327                 if (err < 0) {
 328                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
 329                                 dev->devnum, fmt->iface, fmt->altsetting, err);
 330                         return -EIO;
 331                 }
 332                 subs->interface = -1;
 333                 subs->altset_idx = 0;
 334         }
 335
 336         /* set interface */
 337         if (subs->interface != fmt->iface ||
 338             subs->altset_idx != fmt->altset_idx) {
 339                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 340                 if (err < 0) {
 341                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
 342                                    dev->devnum, fmt->iface, fmt->altsetting, err);
 343                         return -EIO;
 344                 }
 345                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
 346                                 fmt->iface, fmt->altsetting);
 347                 subs->interface = fmt->iface;
 348                 subs->altset_idx = fmt->altset_idx;
 349         }
 350
 351         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 352                                                    alts, fmt->endpoint, subs->direction,
 353                                                    SND_USB_ENDPOINT_TYPE_DATA);
 354         if (!subs->data_endpoint)
 355                 return -EINVAL;
 356
 357         /* we need a sync pipe in async OUT or adaptive IN mode */
 358         /* check the number of EP, since some devices have broken
 359          * descriptors which fool us.  if it has only one EP,
 360          * assume it as adaptive-out or sync-in.
 361          */
 362         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 363
 364         switch (subs->stream->chip->usb_id) {
 365         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 366                 if (is_playback) {
 367                         implicit_fb = 1;
 368                         ep = 0x81;
 369                         iface = usb_ifnum_to_if(dev, 3);
 370
 371                         if (!iface || iface->num_altsetting == 0)
 372                                 return -EINVAL;
 373
 374                         alts = &iface->altsetting[1];
 375                         goto add_sync_ep;
 376                 }
 377                 break;
 378         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 379         case USB_ID(0x0763, 0x2081):
 380                 if (is_playback) {
 381                         implicit_fb = 1;
 382                         ep = 0x81;
 383                         iface = usb_ifnum_to_if(dev, 2);
 384
 385                         if (!iface || iface->num_altsetting == 0)
 386                                 return -EINVAL;
 387
 388                         alts = &iface->altsetting[1];
 389                         goto add_sync_ep;
 390                 }
 391         }
 392
 393         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 394              (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 395             altsd->bNumEndpoints >= 2) {
 396                 /* check sync-pipe endpoint */
 397                 /* ... and check descriptor size before accessing bSynchAddress
 398                    because there is a version of the SB Audigy 2 NX firmware lacking
 399                    the audio fields in the endpoint descriptors */
 400                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 401                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 402                      get_endpoint(alts, 1)->bSynchAddress != 0 &&
 403                      !implicit_fb)) {
 404                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 405                                    dev->devnum, fmt->iface, fmt->altsetting,
 406                                    get_endpoint(alts, 1)->bmAttributes,
 407                                    get_endpoint(alts, 1)->bLength,
 408                                    get_endpoint(alts, 1)->bSynchAddress);
 409                         return -EINVAL;
 410                 }
 411                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 412                 if (!implicit_fb &&
 413                     get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 414                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 415                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 416                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 417                                    dev->devnum, fmt->iface, fmt->altsetting,
 418                                    is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 419                         return -EINVAL;
 420                 }
 421
 422                 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 423                                 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 424
 425 add_sync_ep:
 426                 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 427                                                            alts, ep, !subs->direction,
 428                                                            implicit_fb ?
 429                                                                 SND_USB_ENDPOINT_TYPE_DATA :
 430                                                                 SND_USB_ENDPOINT_TYPE_SYNC);
 431                 if (!subs->sync_endpoint)
 432                         return -EINVAL;
 433
 434                 subs->data_endpoint->sync_master = subs->sync_endpoint;
 435         }
 436
 437         if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
 438                 return err;
 439
 440         subs->cur_audiofmt = fmt;
 441
 442         snd_usb_set_format_quirk(subs, fmt);
 443
 444 #if 0
 445         printk(KERN_DEBUG
 446                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 447                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 448         printk(KERN_DEBUG
 449                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 450                subs->datapipe, subs->syncpipe);
 451 #endif
 452
 453         return 0;
 454 }
 455
 456 /*
 457  * Return the score of matching two audioformats.
 458  * Veto the audioformat if:
 459  * - It has no channels for some reason.
 460  * - Requested PCM format is not supported.
 461  * - Requested sample rate is not supported.
 462  */
 463 static int match_endpoint_audioformats(struct audioformat *fp,
 464         struct audioformat *match, int rate,
 465         snd_pcm_format_t pcm_format)
 466 {
 467         int i;
 468         int score = 0;
 469
 470         if (fp->channels < 1) {
 471                 snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp);
 472                 return 0;
 473         }
 474
 475         if (!(fp->formats & (1ULL << pcm_format))) {
 476                 snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__,
 477                         fp, pcm_format);
 478                 return 0;
 479         }
 480
 481         for (i = 0; i < fp->nr_rates; i++) {
 482                 if (fp->rate_table[i] == rate) {
 483                         score++;
 484                         break;
 485                 }
 486         }
 487         if (!score) {
 488                 snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__,
 489                         fp, rate);
 490                 return 0;
 491         }
 492
 493         if (fp->channels == match->channels)
 494                 score++;
 495
 496         snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score);
 497
 498         return score;
 499 }
 500
 501 /*
 502  * Configure the sync ep using the rate and pcm format of the data ep.
 503  */
 504 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 505 {
 506         int ret;
 507         struct audioformat *fp;
 508         struct audioformat *sync_fp = NULL;
 509         int cur_score = 0;
 510         int sync_period_bytes = subs->period_bytes;
 511         struct snd_usb_substream *sync_subs =
 512                 &subs->stream->substream[subs->direction ^ 1];
 513
 514         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 515             !subs->stream)
 516                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 517                                                    subs->pcm_format,
 518                                                    subs->channels,
 519                                                    subs->period_bytes,
 520                                                    subs->cur_rate,
 521                                                    subs->cur_audiofmt,
 522                                                    NULL);
 523
 524         /* Try to find the best matching audioformat. */
 525         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 526                 int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
 527                         subs->cur_rate, subs->pcm_format);
 528
 529                 if (score > cur_score) {
 530                         sync_fp = fp;
 531                         cur_score = score;
 532                 }
 533         }
 534
 535         if (unlikely(sync_fp == NULL)) {
 536                 snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
 537                         __func__, sync_subs->ep_num);
 538                 return -EINVAL;
 539         }
 540
 541         /*
 542          * Recalculate the period bytes if channel number differ between
 543          * data and sync ep audioformat.
 544          */
 545         if (sync_fp->channels != subs->channels) {
 546                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 547                         sync_fp->channels;
 548                 snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
 549                         __func__, subs->period_bytes, sync_period_bytes);
 550         }
 551
 552         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 553                                           subs->pcm_format,
 554                                           sync_fp->channels,
 555                                           sync_period_bytes,
 556                                           subs->cur_rate,
 557                                           sync_fp,
 558                                           NULL);
 559
 560         return ret;
 561 }
 562
 563 /*
 564  * configure endpoint params
 565  *
 566  * called  during initial setup and upon resume
 567  */
 568 static int configure_endpoint(struct snd_usb_substream *subs)
 569 {
 570         int ret;
 571
 572         /* format changed */
 573         stop_endpoints(subs, true);
 574         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 575                                           subs->pcm_format,
 576                                           subs->channels,
 577                                           subs->period_bytes,
 578                                           subs->cur_rate,
 579                                           subs->cur_audiofmt,
 580                                           subs->sync_endpoint);
 581         if (ret < 0)
 582                 return ret;
 583
 584         if (subs->sync_endpoint)
 585                 ret = configure_sync_endpoint(subs);
 586
 587         return ret;
 588 }
 589
 590 /*
 591  * hw_params callback
 592  *
 593  * allocate a buffer and set the given audio format.
 594  *
 595  * so far we use a physically linear buffer although packetize transfer
 596  * doesn't need a continuous area.
 597  * if sg buffer is supported on the later version of alsa, we'll follow
 598  * that.
 599  */
 600 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 601                              struct snd_pcm_hw_params *hw_params)
 602 {
 603         struct snd_usb_substream *subs = substream->runtime->private_data;
 604         struct audioformat *fmt;
 605         int ret;
 606
 607         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 608                                                params_buffer_bytes(hw_params));
 609         if (ret < 0)
 610                 return ret;
 611
 612         subs->pcm_format = params_format(hw_params);
 613         subs->period_bytes = params_period_bytes(hw_params);
 614         subs->channels = params_channels(hw_params);
 615         subs->cur_rate = params_rate(hw_params);
 616
 617         fmt = find_format(subs);
 618         if (!fmt) {
 619                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 620                            subs->pcm_format, subs->cur_rate, subs->channels);
 621                 return -EINVAL;
 622         }
 623
 624         down_read(&subs->stream->chip->shutdown_rwsem);
 625         if (subs->stream->chip->shutdown)
 626                 ret = -ENODEV;
 627         else
 628                 ret = set_format(subs, fmt);
 629         up_read(&subs->stream->chip->shutdown_rwsem);
 630         if (ret < 0)
 631                 return ret;
 632
 633         subs->interface = fmt->iface;
 634         subs->altset_idx = fmt->altset_idx;
 635         subs->need_setup_ep = true;
 636
 637         return 0;
 638 }
 639
 640 /*
 641  * hw_free callback
 642  *
 643  * reset the audio format and release the buffer
 644  */
 645 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 646 {
 647         struct snd_usb_substream *subs = substream->runtime->private_data;
 648
 649         subs->cur_audiofmt = NULL;
 650         subs->cur_rate = 0;
 651         subs->period_bytes = 0;
 652         down_read(&subs->stream->chip->shutdown_rwsem);
 653         if (!subs->stream->chip->shutdown) {
 654                 stop_endpoints(subs, true);
 655                 deactivate_endpoints(subs);
 656         }
 657         up_read(&subs->stream->chip->shutdown_rwsem);
 658         return snd_pcm_lib_free_vmalloc_buffer(substream);
 659 }
 660
 661 /*
 662  * prepare callback
 663  *
 664  * only a few subtle things...
 665  */
 666 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 667 {
 668         struct snd_pcm_runtime *runtime = substream->runtime;
 669         struct snd_usb_substream *subs = runtime->private_data;
 670         struct usb_host_interface *alts;
 671         struct usb_interface *iface;
 672         int ret;
 673
 674         if (! subs->cur_audiofmt) {
 675                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 676                 return -ENXIO;
 677         }
 678
 679         down_read(&subs->stream->chip->shutdown_rwsem);
 680         if (subs->stream->chip->shutdown) {
 681                 ret = -ENODEV;
 682                 goto unlock;
 683         }
 684         if (snd_BUG_ON(!subs->data_endpoint)) {
 685                 ret = -EIO;
 686                 goto unlock;
 687         }
 688
 689         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 690         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 691
 692         ret = set_format(subs, subs->cur_audiofmt);
 693         if (ret < 0)
 694                 goto unlock;
 695
 696         iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 697         alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 698         ret = snd_usb_init_sample_rate(subs->stream->chip,
 699                                        subs->cur_audiofmt->iface,
 700                                        alts,
 701                                        subs->cur_audiofmt,
 702                                        subs->cur_rate);
 703         if (ret < 0)
 704                 goto unlock;
 705
 706         if (subs->need_setup_ep) {
 707                 ret = configure_endpoint(subs);
 708                 if (ret < 0)
 709                         goto unlock;
 710                 subs->need_setup_ep = false;
 711         }
 712
 713         /* some unit conversions in runtime */
 714         subs->data_endpoint->maxframesize =
 715                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 716         subs->data_endpoint->curframesize =
 717                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 718
 719         /* reset the pointer */
 720         subs->hwptr_done = 0;
 721         subs->transfer_done = 0;
 722         subs->last_delay = 0;
 723         subs->last_frame_number = 0;
 724         runtime->delay = 0;
 725
 726         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 727          * updates for all URBs would happen at the same time when starting */
 728         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 729                 ret = start_endpoints(subs, true);
 730
 731  unlock:
 732         up_read(&subs->stream->chip->shutdown_rwsem);
 733         return ret;
 734 }
 735
 736 static struct snd_pcm_hardware snd_usb_hardware =
 737 {
 738         .info =                 SNDRV_PCM_INFO_MMAP |
 739                                 SNDRV_PCM_INFO_MMAP_VALID |
 740                                 SNDRV_PCM_INFO_BATCH |
 741                                 SNDRV_PCM_INFO_INTERLEAVED |
 742                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 743                                 SNDRV_PCM_INFO_PAUSE,
 744         .buffer_bytes_max =     1024 * 1024,
 745         .period_bytes_min =     64,
 746         .period_bytes_max =     512 * 1024,
 747         .periods_min =          2,
 748         .periods_max =          1024,
 749 };
 750
 751 static int hw_check_valid_format(struct snd_usb_substream *subs,
 752                                  struct snd_pcm_hw_params *params,
 753                                  struct audioformat *fp)
 754 {
 755         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 756         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 757         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 758         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 759         struct snd_mask check_fmts;
 760         unsigned int ptime;
 761
 762         /* check the format */
 763         snd_mask_none(&check_fmts);
 764         check_fmts.bits[0] = (u32)fp->formats;
 765         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 766         snd_mask_intersect(&check_fmts, fmts);
 767         if (snd_mask_empty(&check_fmts)) {
 768                 hwc_debug("   > check: no supported format %d\n", fp->format);
 769                 return 0;
 770         }
 771         /* check the channels */
 772         if (fp->channels < ct->min || fp->channels > ct->max) {
 773                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 774                 return 0;
 775         }
 776         /* check the rate is within the range */
 777         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 778                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 779                 return 0;
 780         }
 781         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 782                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 783                 return 0;
 784         }
 785         /* check whether the period time is >= the data packet interval */
 786         if (subs->speed != USB_SPEED_FULL) {
 787                 ptime = 125 * (1 << fp->datainterval);
 788                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 789                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 790                         return 0;
 791                 }
 792         }
 793         return 1;
 794 }
 795
 796 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 797                         struct snd_pcm_hw_rule *rule)
 798 {
 799         struct snd_usb_substream *subs = rule->private;
 800         struct list_head *p;
 801         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 802         unsigned int rmin, rmax;
 803         int changed;
 804
 805         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 806         changed = 0;
 807         rmin = rmax = 0;
 808         list_for_each(p, &subs->fmt_list) {
 809                 struct audioformat *fp;
 810                 fp = list_entry(p, struct audioformat, list);
 811                 if (!hw_check_valid_format(subs, params, fp))
 812                         continue;
 813                 if (changed++) {
 814                         if (rmin > fp->rate_min)
 815                                 rmin = fp->rate_min;
 816                         if (rmax < fp->rate_max)
 817                                 rmax = fp->rate_max;
 818                 } else {
 819                         rmin = fp->rate_min;
 820                         rmax = fp->rate_max;
 821                 }
 822         }
 823
 824         if (!changed) {
 825                 hwc_debug("  --> get empty\n");
 826                 it->empty = 1;
 827                 return -EINVAL;
 828         }
 829
 830         changed = 0;
 831         if (it->min < rmin) {
 832                 it->min = rmin;
 833                 it->openmin = 0;
 834                 changed = 1;
 835         }
 836         if (it->max > rmax) {
 837                 it->max = rmax;
 838                 it->openmax = 0;
 839                 changed = 1;
 840         }
 841         if (snd_interval_checkempty(it)) {
 842                 it->empty = 1;
 843                 return -EINVAL;
 844         }
 845         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 846         return changed;
 847 }
 848
 849
 850 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 851                             struct snd_pcm_hw_rule *rule)
 852 {
 853         struct snd_usb_substream *subs = rule->private;
 854         struct list_head *p;
 855         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 856         unsigned int rmin, rmax;
 857         int changed;
 858
 859         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 860         changed = 0;
 861         rmin = rmax = 0;
 862         list_for_each(p, &subs->fmt_list) {
 863                 struct audioformat *fp;
 864                 fp = list_entry(p, struct audioformat, list);
 865                 if (!hw_check_valid_format(subs, params, fp))
 866                         continue;
 867                 if (changed++) {
 868                         if (rmin > fp->channels)
 869                                 rmin = fp->channels;
 870                         if (rmax < fp->channels)
 871                                 rmax = fp->channels;
 872                 } else {
 873                         rmin = fp->channels;
 874                         rmax = fp->channels;
 875                 }
 876         }
 877
 878         if (!changed) {
 879                 hwc_debug("  --> get empty\n");
 880                 it->empty = 1;
 881                 return -EINVAL;
 882         }
 883
 884         changed = 0;
 885         if (it->min < rmin) {
 886                 it->min = rmin;
 887                 it->openmin = 0;
 888                 changed = 1;
 889         }
 890         if (it->max > rmax) {
 891                 it->max = rmax;
 892                 it->openmax = 0;
 893                 changed = 1;
 894         }
 895         if (snd_interval_checkempty(it)) {
 896                 it->empty = 1;
 897                 return -EINVAL;
 898         }
 899         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 900         return changed;
 901 }
 902
 903 static int hw_rule_format(struct snd_pcm_hw_params *params,
 904                           struct snd_pcm_hw_rule *rule)
 905 {
 906         struct snd_usb_substream *subs = rule->private;
 907         struct list_head *p;
 908         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 909         u64 fbits;
 910         u32 oldbits[2];
 911         int changed;
 912
 913         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 914         fbits = 0;
 915         list_for_each(p, &subs->fmt_list) {
 916                 struct audioformat *fp;
 917                 fp = list_entry(p, struct audioformat, list);
 918                 if (!hw_check_valid_format(subs, params, fp))
 919                         continue;
 920                 fbits |= fp->formats;
 921         }
 922
 923         oldbits[0] = fmt->bits[0];
 924         oldbits[1] = fmt->bits[1];
 925         fmt->bits[0] &= (u32)fbits;
 926         fmt->bits[1] &= (u32)(fbits >> 32);
 927         if (!fmt->bits[0] && !fmt->bits[1]) {
 928                 hwc_debug("  --> get empty\n");
 929                 return -EINVAL;
 930         }
 931         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 932         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 933         return changed;
 934 }
 935
 936 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 937                                struct snd_pcm_hw_rule *rule)
 938 {
 939         struct snd_usb_substream *subs = rule->private;
 940         struct audioformat *fp;
 941         struct snd_interval *it;
 942         unsigned char min_datainterval;
 943         unsigned int pmin;
 944         int changed;
 945
 946         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 947         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 948         min_datainterval = 0xff;
 949         list_for_each_entry(fp, &subs->fmt_list, list) {
 950                 if (!hw_check_valid_format(subs, params, fp))
 951                         continue;
 952                 min_datainterval = min(min_datainterval, fp->datainterval);
 953         }
 954         if (min_datainterval == 0xff) {
 955                 hwc_debug("  --> get empty\n");
 956                 it->empty = 1;
 957                 return -EINVAL;
 958         }
 959         pmin = 125 * (1 << min_datainterval);
 960         changed = 0;
 961         if (it->min < pmin) {
 962                 it->min = pmin;
 963                 it->openmin = 0;
 964                 changed = 1;
 965         }
 966         if (snd_interval_checkempty(it)) {
 967                 it->empty = 1;
 968                 return -EINVAL;
 969         }
 970         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 971         return changed;
 972 }
 973
 974 /*
 975  *  If the device supports unusual bit rates, does the request meet these?
 976  */
 977 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 978                                   struct snd_usb_substream *subs)
 979 {
 980         struct audioformat *fp;
 981         int *rate_list;
 982         int count = 0, needs_knot = 0;
 983         int err;
 984
 985         kfree(subs->rate_list.list);
 986         subs->rate_list.list = NULL;
 987
 988         list_for_each_entry(fp, &subs->fmt_list, list) {
 989                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 990                         return 0;
 991                 count += fp->nr_rates;
 992                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 993                         needs_knot = 1;
 994         }
 995         if (!needs_knot)
 996                 return 0;
 997
 998         subs->rate_list.list = rate_list =
 999                 kmalloc(sizeof(int) * count, GFP_KERNEL);
1000         if (!subs->rate_list.list)
1001                 return -ENOMEM;
1002         subs->rate_list.count = count;
1003         subs->rate_list.mask = 0;
1004         count = 0;
1005         list_for_each_entry(fp, &subs->fmt_list, list) {
1006                 int i;
1007                 for (i = 0; i < fp->nr_rates; i++)
1008                         rate_list[count++] = fp->rate_table[i];
1009         }
1010         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1011                                          &subs->rate_list);
1012         if (err < 0)
1013                 return err;
1014
1015         return 0;
1016 }
1017
1018
1019 /*
1020  * set up the runtime hardware information.
1021  */
1022
1023 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1024 {
1025         struct list_head *p;
1026         unsigned int pt, ptmin;
1027         int param_period_time_if_needed;
1028         int err;
1029
1030         runtime->hw.formats = subs->formats;
1031
1032         runtime->hw.rate_min = 0x7fffffff;
1033         runtime->hw.rate_max = 0;
1034         runtime->hw.channels_min = 256;
1035         runtime->hw.channels_max = 0;
1036         runtime->hw.rates = 0;
1037         ptmin = UINT_MAX;
1038         /* check min/max rates and channels */
1039         list_for_each(p, &subs->fmt_list) {
1040                 struct audioformat *fp;
1041                 fp = list_entry(p, struct audioformat, list);
1042                 runtime->hw.rates |= fp->rates;
1043                 if (runtime->hw.rate_min > fp->rate_min)
1044                         runtime->hw.rate_min = fp->rate_min;
1045                 if (runtime->hw.rate_max < fp->rate_max)
1046                         runtime->hw.rate_max = fp->rate_max;
1047                 if (runtime->hw.channels_min > fp->channels)
1048                         runtime->hw.channels_min = fp->channels;
1049                 if (runtime->hw.channels_max < fp->channels)
1050                         runtime->hw.channels_max = fp->channels;
1051                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1052                         /* FIXME: there might be more than one audio formats... */
1053                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1054                                 fp->frame_size;
1055                 }
1056                 pt = 125 * (1 << fp->datainterval);
1057                 ptmin = min(ptmin, pt);
1058         }
1059         err = snd_usb_autoresume(subs->stream->chip);
1060         if (err < 0)
1061                 return err;
1062
1063         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1064         if (subs->speed == USB_SPEED_FULL)
1065                 /* full speed devices have fixed data packet interval */
1066                 ptmin = 1000;
1067         if (ptmin == 1000)
1068                 /* if period time doesn't go below 1 ms, no rules needed */
1069                 param_period_time_if_needed = -1;
1070         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1071                                      ptmin, UINT_MAX);
1072
1073         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1074                                        hw_rule_rate, subs,
1075                                        SNDRV_PCM_HW_PARAM_FORMAT,
1076                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1077                                        param_period_time_if_needed,
1078                                        -1)) < 0)
1079                 goto rep_err;
1080         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1081                                        hw_rule_channels, subs,
1082                                        SNDRV_PCM_HW_PARAM_FORMAT,
1083                                        SNDRV_PCM_HW_PARAM_RATE,
1084                                        param_period_time_if_needed,
1085                                        -1)) < 0)
1086                 goto rep_err;
1087         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1088                                        hw_rule_format, subs,
1089                                        SNDRV_PCM_HW_PARAM_RATE,
1090                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1091                                        param_period_time_if_needed,
1092                                        -1)) < 0)
1093                 goto rep_err;
1094         if (param_period_time_if_needed >= 0) {
1095                 err = snd_pcm_hw_rule_add(runtime, 0,
1096                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1097                                           hw_rule_period_time, subs,
1098                                           SNDRV_PCM_HW_PARAM_FORMAT,
1099                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1100                                           SNDRV_PCM_HW_PARAM_RATE,
1101                                           -1);
1102                 if (err < 0)
1103                         goto rep_err;
1104         }
1105         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1106                 goto rep_err;
1107         return 0;
1108
1109 rep_err:
1110         snd_usb_autosuspend(subs->stream->chip);
1111         return err;
1112 }
1113
1114 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1115 {
1116         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1117         struct snd_pcm_runtime *runtime = substream->runtime;
1118         struct snd_usb_substream *subs = &as->substream[direction];
1119
1120         subs->interface = -1;
1121         subs->altset_idx = 0;
1122         runtime->hw = snd_usb_hardware;
1123         runtime->private_data = subs;
1124         subs->pcm_substream = substream;
1125         /* runtime PM is also done there */
1126         return setup_hw_info(runtime, subs);
1127 }
1128
1129 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1130 {
1131         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1132         struct snd_usb_substream *subs = &as->substream[direction];
1133
1134         stop_endpoints(subs, true);
1135
1136         if (!as->chip->shutdown && subs->interface >= 0) {
1137                 usb_set_interface(subs->dev, subs->interface, 0);
1138                 subs->interface = -1;
1139         }
1140
1141         subs->pcm_substream = NULL;
1142         snd_usb_autosuspend(subs->stream->chip);
1143
1144         return 0;
1145 }
1146
1147 /* Since a URB can handle only a single linear buffer, we must use double
1148  * buffering when the data to be transferred overflows the buffer boundary.
1149  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1150  * for all URBs.
1151  */
1152 static void retire_capture_urb(struct snd_usb_substream *subs,
1153                                struct urb *urb)
1154 {
1155         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1156         unsigned int stride, frames, bytes, oldptr;
1157         int i, period_elapsed = 0;
1158         unsigned long flags;
1159         unsigned char *cp;
1160
1161         stride = runtime->frame_bits >> 3;
1162
1163         for (i = 0; i < urb->number_of_packets; i++) {
1164                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1165                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1166                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1167                         // continue;
1168                 }
1169                 bytes = urb->iso_frame_desc[i].actual_length;
1170                 frames = bytes / stride;
1171                 if (!subs->txfr_quirk)
1172                         bytes = frames * stride;
1173                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1174 #ifdef CONFIG_SND_DEBUG_VERBOSE
1175                         int oldbytes = bytes;
1176 #endif
1177                         bytes = frames * stride;
1178                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1179                                                         oldbytes, bytes);
1180                 }
1181                 /* update the current pointer */
1182                 spin_lock_irqsave(&subs->lock, flags);
1183                 oldptr = subs->hwptr_done;
1184                 subs->hwptr_done += bytes;
1185                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1186                         subs->hwptr_done -= runtime->buffer_size * stride;
1187                 frames = (bytes + (oldptr % stride)) / stride;
1188                 subs->transfer_done += frames;
1189                 if (subs->transfer_done >= runtime->period_size) {
1190                         subs->transfer_done -= runtime->period_size;
1191                         period_elapsed = 1;
1192                 }
1193                 spin_unlock_irqrestore(&subs->lock, flags);
1194                 /* copy a data chunk */
1195                 if (oldptr + bytes > runtime->buffer_size * stride) {
1196                         unsigned int bytes1 =
1197                                         runtime->buffer_size * stride - oldptr;
1198                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1199                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1200                 } else {
1201                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1202                 }
1203         }
1204
1205         if (period_elapsed)
1206                 snd_pcm_period_elapsed(subs->pcm_substream);
1207 }
1208
1209 static void prepare_playback_urb(struct snd_usb_substream *subs,
1210                                  struct urb *urb)
1211 {
1212         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1213         struct snd_usb_endpoint *ep = subs->data_endpoint;
1214         struct snd_urb_ctx *ctx = urb->context;
1215         unsigned int counts, frames, bytes;
1216         int i, stride, period_elapsed = 0;
1217         unsigned long flags;
1218
1219         stride = runtime->frame_bits >> 3;
1220
1221         frames = 0;
1222         urb->number_of_packets = 0;
1223         spin_lock_irqsave(&subs->lock, flags);
1224         for (i = 0; i < ctx->packets; i++) {
1225                 if (ctx->packet_size[i])
1226                         counts = ctx->packet_size[i];
1227                 else
1228                         counts = snd_usb_endpoint_next_packet_size(ep);
1229
1230                 /* set up descriptor */
1231                 urb->iso_frame_desc[i].offset = frames * stride;
1232                 urb->iso_frame_desc[i].length = counts * stride;
1233                 frames += counts;
1234                 urb->number_of_packets++;
1235                 subs->transfer_done += counts;
1236                 if (subs->transfer_done >= runtime->period_size) {
1237                         subs->transfer_done -= runtime->period_size;
1238                         period_elapsed = 1;
1239                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1240                                 if (subs->transfer_done > 0) {
1241                                         /* FIXME: fill-max mode is not
1242                                          * supported yet */
1243                                         frames -= subs->transfer_done;
1244                                         counts -= subs->transfer_done;
1245                                         urb->iso_frame_desc[i].length =
1246                                                 counts * stride;
1247                                         subs->transfer_done = 0;
1248                                 }
1249                                 i++;
1250                                 if (i < ctx->packets) {
1251                                         /* add a transfer delimiter */
1252                                         urb->iso_frame_desc[i].offset =
1253                                                 frames * stride;
1254                                         urb->iso_frame_desc[i].length = 0;
1255                                         urb->number_of_packets++;
1256                                 }
1257                                 break;
1258                         }
1259                 }
1260                 if (period_elapsed &&
1261                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1262                         break;
1263         }
1264         bytes = frames * stride;
1265         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1266                 /* err, the transferred area goes over buffer boundary. */
1267                 unsigned int bytes1 =
1268                         runtime->buffer_size * stride - subs->hwptr_done;
1269                 memcpy(urb->transfer_buffer,
1270                        runtime->dma_area + subs->hwptr_done, bytes1);
1271                 memcpy(urb->transfer_buffer + bytes1,
1272                        runtime->dma_area, bytes - bytes1);
1273         } else {
1274                 memcpy(urb->transfer_buffer,
1275                        runtime->dma_area + subs->hwptr_done, bytes);
1276         }
1277         subs->hwptr_done += bytes;
1278         if (subs->hwptr_done >= runtime->buffer_size * stride)
1279                 subs->hwptr_done -= runtime->buffer_size * stride;
1280
1281         /* update delay with exact number of samples queued */
1282         runtime->delay = subs->last_delay;
1283         runtime->delay += frames;
1284         subs->last_delay = runtime->delay;
1285
1286         /* realign last_frame_number */
1287         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1288         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1289
1290         spin_unlock_irqrestore(&subs->lock, flags);
1291         urb->transfer_buffer_length = bytes;
1292         if (period_elapsed)
1293                 snd_pcm_period_elapsed(subs->pcm_substream);
1294 }
1295
1296 /*
1297  * process after playback data complete
1298  * - decrease the delay count again
1299  */
1300 static void retire_playback_urb(struct snd_usb_substream *subs,
1301                                struct urb *urb)
1302 {
1303         unsigned long flags;
1304         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1305         int stride = runtime->frame_bits >> 3;
1306         int processed = urb->transfer_buffer_length / stride;
1307         int est_delay;
1308
1309         /* ignore the delay accounting when procssed=0 is given, i.e.
1310          * silent payloads are procssed before handling the actual data
1311          */
1312         if (!processed)
1313                 return;
1314
1315         spin_lock_irqsave(&subs->lock, flags);
1316         if (!subs->last_delay)
1317                 goto out; /* short path */
1318
1319         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1320         /* update delay with exact number of samples played */
1321         if (processed > subs->last_delay)
1322                 subs->last_delay = 0;
1323         else
1324                 subs->last_delay -= processed;
1325         runtime->delay = subs->last_delay;
1326
1327         /*
1328          * Report when delay estimate is off by more than 2ms.
1329          * The error should be lower than 2ms since the estimate relies
1330          * on two reads of a counter updated every ms.
1331          */
1332         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1333                 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1334                         est_delay, subs->last_delay);
1335
1336         if (!subs->running) {
1337                 /* update last_frame_number for delay counting here since
1338                  * prepare_playback_urb won't be called during pause
1339                  */
1340                 subs->last_frame_number =
1341                         usb_get_current_frame_number(subs->dev) & 0xff;
1342         }
1343
1344  out:
1345         spin_unlock_irqrestore(&subs->lock, flags);
1346 }
1347
1348 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1349 {
1350         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1351 }
1352
1353 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1354 {
1355         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1356 }
1357
1358 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1359 {
1360         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1361 }
1362
1363 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1364 {
1365         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1366 }
1367
1368 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1369                                               int cmd)
1370 {
1371         struct snd_usb_substream *subs = substream->runtime->private_data;
1372
1373         switch (cmd) {
1374         case SNDRV_PCM_TRIGGER_START:
1375         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1376                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1377                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1378                 subs->running = 1;
1379                 return 0;
1380         case SNDRV_PCM_TRIGGER_STOP:
1381                 stop_endpoints(subs, false);
1382                 subs->running = 0;
1383                 return 0;
1384         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1385                 subs->data_endpoint->prepare_data_urb = NULL;
1386                 /* keep retire_data_urb for delay calculation */
1387                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1388                 subs->running = 0;
1389                 return 0;
1390         }
1391
1392         return -EINVAL;
1393 }
1394
1395 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1396                                              int cmd)
1397 {
1398         int err;
1399         struct snd_usb_substream *subs = substream->runtime->private_data;
1400
1401         switch (cmd) {
1402         case SNDRV_PCM_TRIGGER_START:
1403                 err = start_endpoints(subs, false);
1404                 if (err < 0)
1405                         return err;
1406
1407                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1408                 subs->running = 1;
1409                 return 0;
1410         case SNDRV_PCM_TRIGGER_STOP:
1411                 stop_endpoints(subs, false);
1412                 subs->running = 0;
1413                 return 0;
1414         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1415                 subs->data_endpoint->retire_data_urb = NULL;
1416                 subs->running = 0;
1417                 return 0;
1418         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1419                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1420                 subs->running = 1;
1421                 return 0;
1422         }
1423
1424         return -EINVAL;
1425 }
1426
1427 static struct snd_pcm_ops snd_usb_playback_ops = {
1428         .open =         snd_usb_playback_open,
1429         .close =        snd_usb_playback_close,
1430         .ioctl =        snd_pcm_lib_ioctl,
1431         .hw_params =    snd_usb_hw_params,
1432         .hw_free =      snd_usb_hw_free,
1433         .prepare =      snd_usb_pcm_prepare,
1434         .trigger =      snd_usb_substream_playback_trigger,
1435         .pointer =      snd_usb_pcm_pointer,
1436         .page =         snd_pcm_lib_get_vmalloc_page,
1437         .mmap =         snd_pcm_lib_mmap_vmalloc,
1438 };
1439
1440 static struct snd_pcm_ops snd_usb_capture_ops = {
1441         .open =         snd_usb_capture_open,
1442         .close =        snd_usb_capture_close,
1443         .ioctl =        snd_pcm_lib_ioctl,
1444         .hw_params =    snd_usb_hw_params,
1445         .hw_free =      snd_usb_hw_free,
1446         .prepare =      snd_usb_pcm_prepare,
1447         .trigger =      snd_usb_substream_capture_trigger,
1448         .pointer =      snd_usb_pcm_pointer,
1449         .page =         snd_pcm_lib_get_vmalloc_page,
1450         .mmap =         snd_pcm_lib_mmap_vmalloc,
1451 };
1452
1453 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1454 {
1455         snd_pcm_set_ops(pcm, stream,
1456                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1457                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1458 }