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 =  frame_diff * rate / 1000;
  63         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  64                 est_delay = subs->last_delay - est_delay;
  65         else
  66                 est_delay = subs->last_delay + est_delay;
  67
  68         if (est_delay < 0)
  69                 est_delay = 0;
  70         return est_delay;
  71 }
  72
  73 /*
  74  * return the current pcm pointer.  just based on the hwptr_done value.
  75  */
  76 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  77 {
  78         struct snd_usb_substream *subs;
  79         unsigned int hwptr_done;
  80
  81         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  82         if (subs->stream->chip->shutdown)
  83                 return SNDRV_PCM_POS_XRUN;
  84         spin_lock(&subs->lock);
  85         hwptr_done = subs->hwptr_done;
  86         substream->runtime->delay = snd_usb_pcm_delay(subs,
  87                                                 substream->runtime->rate);
  88         spin_unlock(&subs->lock);
  89         return hwptr_done / (substream->runtime->frame_bits >> 3);
  90 }
  91
  92 /*
  93  * find a matching audio format
  94  */
  95 static struct audioformat *find_format(struct snd_usb_substream *subs)
  96 {
  97         struct list_head *p;
  98         struct audioformat *found = NULL;
  99         int cur_attr = 0, attr;
 100
 101         list_for_each(p, &subs->fmt_list) {
 102                 struct audioformat *fp;
 103                 fp = list_entry(p, struct audioformat, list);
 104                 if (!(fp->formats & (1uLL << subs->pcm_format)))
 105                         continue;
 106                 if (fp->channels != subs->channels)
 107                         continue;
 108                 if (subs->cur_rate < fp->rate_min ||
 109                     subs->cur_rate > fp->rate_max)
 110                         continue;
 111                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 112                         unsigned int i;
 113                         for (i = 0; i < fp->nr_rates; i++)
 114                                 if (fp->rate_table[i] == subs->cur_rate)
 115                                         break;
 116                         if (i >= fp->nr_rates)
 117                                 continue;
 118                 }
 119                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 120                 if (! found) {
 121                         found = fp;
 122                         cur_attr = attr;
 123                         continue;
 124                 }
 125                 /* avoid async out and adaptive in if the other method
 126                  * supports the same format.
 127                  * this is a workaround for the case like
 128                  * M-audio audiophile USB.
 129                  */
 130                 if (attr != cur_attr) {
 131                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 132                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 133                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 134                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 135                                 continue;
 136                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 137                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 138                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 139                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 140                                 found = fp;
 141                                 cur_attr = attr;
 142                                 continue;
 143                         }
 144                 }
 145                 /* find the format with the largest max. packet size */
 146                 if (fp->maxpacksize > found->maxpacksize) {
 147                         found = fp;
 148                         cur_attr = attr;
 149                 }
 150         }
 151         return found;
 152 }
 153
 154 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 155                          struct usb_host_interface *alts,
 156                          struct audioformat *fmt)
 157 {
 158         struct usb_device *dev = chip->dev;
 159         unsigned int ep;
 160         unsigned char data[1];
 161         int err;
 162
 163         ep = get_endpoint(alts, 0)->bEndpointAddress;
 164
 165         data[0] = 1;
 166         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 167                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 168                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 169                                    data, sizeof(data))) < 0) {
 170                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 171                            dev->devnum, iface, ep);
 172                 return err;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 179                          struct usb_host_interface *alts,
 180                          struct audioformat *fmt)
 181 {
 182         struct usb_device *dev = chip->dev;
 183         unsigned char data[1];
 184         int err;
 185
 186         data[0] = 1;
 187         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 188                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 189                                    UAC2_EP_CS_PITCH << 8, 0,
 190                                    data, sizeof(data))) < 0) {
 191                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 192                            dev->devnum, iface, fmt->altsetting);
 193                 return err;
 194         }
 195
 196         return 0;
 197 }
 198
 199 /*
 200  * initialize the pitch control and sample rate
 201  */
 202 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 203                        struct usb_host_interface *alts,
 204                        struct audioformat *fmt)
 205 {
 206         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 207
 208         /* if endpoint doesn't have pitch control, bail out */
 209         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 210                 return 0;
 211
 212         switch (altsd->bInterfaceProtocol) {
 213         case UAC_VERSION_1:
 214         default:
 215                 return init_pitch_v1(chip, iface, alts, fmt);
 216
 217         case UAC_VERSION_2:
 218                 return init_pitch_v2(chip, iface, alts, fmt);
 219         }
 220 }
 221
 222 static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
 223 {
 224         int err;
 225
 226         if (!subs->data_endpoint)
 227                 return -EINVAL;
 228
 229         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 230                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 231
 232                 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
 233
 234                 ep->data_subs = subs;
 235                 err = snd_usb_endpoint_start(ep, can_sleep);
 236                 if (err < 0) {
 237                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 238                         return err;
 239                 }
 240         }
 241
 242         if (subs->sync_endpoint &&
 243             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 244                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 245
 246                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 247                     subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
 248                         err = usb_set_interface(subs->dev,
 249                                                 subs->sync_endpoint->iface,
 250                                                 subs->sync_endpoint->alt_idx);
 251                         if (err < 0) {
 252                                 snd_printk(KERN_ERR
 253                                            "%d:%d:%d: cannot set interface (%d)\n",
 254                                            subs->dev->devnum,
 255                                            subs->sync_endpoint->iface,
 256                                            subs->sync_endpoint->alt_idx, err);
 257                                 return -EIO;
 258                         }
 259                 }
 260
 261                 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
 262
 263                 ep->sync_slave = subs->data_endpoint;
 264                 err = snd_usb_endpoint_start(ep, can_sleep);
 265                 if (err < 0) {
 266                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 267                         return err;
 268                 }
 269         }
 270
 271         return 0;
 272 }
 273
 274 static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 275 {
 276         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 277                 snd_usb_endpoint_stop(subs->sync_endpoint);
 278
 279         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 280                 snd_usb_endpoint_stop(subs->data_endpoint);
 281
 282         if (wait) {
 283                 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 284                 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 285         }
 286 }
 287
 288 static int deactivate_endpoints(struct snd_usb_substream *subs)
 289 {
 290         int reta, retb;
 291
 292         reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
 293         retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
 294
 295         if (reta < 0)
 296                 return reta;
 297
 298         if (retb < 0)
 299                 return retb;
 300
 301         return 0;
 302 }
 303
 304 /*
 305  * find a matching format and set up the interface
 306  */
 307 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 308 {
 309         struct usb_device *dev = subs->dev;
 310         struct usb_host_interface *alts;
 311         struct usb_interface_descriptor *altsd;
 312         struct usb_interface *iface;
 313         unsigned int ep, attr;
 314         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 315         int err, implicit_fb = 0;
 316
 317         iface = usb_ifnum_to_if(dev, fmt->iface);
 318         if (WARN_ON(!iface))
 319                 return -EINVAL;
 320         alts = &iface->altsetting[fmt->altset_idx];
 321         altsd = get_iface_desc(alts);
 322         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 323                 return -EINVAL;
 324
 325         if (fmt == subs->cur_audiofmt)
 326                 return 0;
 327
 328         /* close the old interface */
 329         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 330                 err = usb_set_interface(subs->dev, subs->interface, 0);
 331                 if (err < 0) {
 332                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
 333                                 dev->devnum, fmt->iface, fmt->altsetting, err);
 334                         return -EIO;
 335                 }
 336                 subs->interface = -1;
 337                 subs->altset_idx = 0;
 338         }
 339
 340         /* set interface */
 341         if (subs->interface != fmt->iface ||
 342             subs->altset_idx != fmt->altset_idx) {
 343                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 344                 if (err < 0) {
 345                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
 346                                    dev->devnum, fmt->iface, fmt->altsetting, err);
 347                         return -EIO;
 348                 }
 349                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
 350                                 fmt->iface, fmt->altsetting);
 351                 subs->interface = fmt->iface;
 352                 subs->altset_idx = fmt->altset_idx;
 353         }
 354
 355         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 356                                                    alts, fmt->endpoint, subs->direction,
 357                                                    SND_USB_ENDPOINT_TYPE_DATA);
 358         if (!subs->data_endpoint)
 359                 return -EINVAL;
 360
 361         /* we need a sync pipe in async OUT or adaptive IN mode */
 362         /* check the number of EP, since some devices have broken
 363          * descriptors which fool us.  if it has only one EP,
 364          * assume it as adaptive-out or sync-in.
 365          */
 366         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 367
 368         switch (subs->stream->chip->usb_id) {
 369         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 370                 if (is_playback) {
 371                         implicit_fb = 1;
 372                         ep = 0x81;
 373                         iface = usb_ifnum_to_if(dev, 3);
 374
 375                         if (!iface || iface->num_altsetting == 0)
 376                                 return -EINVAL;
 377
 378                         alts = &iface->altsetting[1];
 379                         goto add_sync_ep;
 380                 }
 381                 break;
 382         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 383         case USB_ID(0x0763, 0x2081):
 384                 if (is_playback) {
 385                         implicit_fb = 1;
 386                         ep = 0x81;
 387                         iface = usb_ifnum_to_if(dev, 2);
 388
 389                         if (!iface || iface->num_altsetting == 0)
 390                                 return -EINVAL;
 391
 392                         alts = &iface->altsetting[1];
 393                         goto add_sync_ep;
 394                 }
 395         }
 396
 397         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 398              (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 399             altsd->bNumEndpoints >= 2) {
 400                 /* check sync-pipe endpoint */
 401                 /* ... and check descriptor size before accessing bSynchAddress
 402                    because there is a version of the SB Audigy 2 NX firmware lacking
 403                    the audio fields in the endpoint descriptors */
 404                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 405                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 406                      get_endpoint(alts, 1)->bSynchAddress != 0 &&
 407                      !implicit_fb)) {
 408                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 409                                    dev->devnum, fmt->iface, fmt->altsetting,
 410                                    get_endpoint(alts, 1)->bmAttributes,
 411                                    get_endpoint(alts, 1)->bLength,
 412                                    get_endpoint(alts, 1)->bSynchAddress);
 413                         return -EINVAL;
 414                 }
 415                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 416                 if (!implicit_fb &&
 417                     get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 418                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 419                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 420                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 421                                    dev->devnum, fmt->iface, fmt->altsetting,
 422                                    is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 423                         return -EINVAL;
 424                 }
 425
 426                 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 427                                 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 428
 429 add_sync_ep:
 430                 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 431                                                            alts, ep, !subs->direction,
 432                                                            implicit_fb ?
 433                                                                 SND_USB_ENDPOINT_TYPE_DATA :
 434                                                                 SND_USB_ENDPOINT_TYPE_SYNC);
 435                 if (!subs->sync_endpoint)
 436                         return -EINVAL;
 437
 438                 subs->data_endpoint->sync_master = subs->sync_endpoint;
 439         }
 440
 441         if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
 442                 return err;
 443
 444         subs->cur_audiofmt = fmt;
 445
 446         snd_usb_set_format_quirk(subs, fmt);
 447
 448 #if 0
 449         printk(KERN_DEBUG
 450                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 451                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 452         printk(KERN_DEBUG
 453                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 454                subs->datapipe, subs->syncpipe);
 455 #endif
 456
 457         return 0;
 458 }
 459
 460 /*
 461  * Return the score of matching two audioformats.
 462  * Veto the audioformat if:
 463  * - It has no channels for some reason.
 464  * - Requested PCM format is not supported.
 465  * - Requested sample rate is not supported.
 466  */
 467 static int match_endpoint_audioformats(struct audioformat *fp,
 468         struct audioformat *match, int rate,
 469         snd_pcm_format_t pcm_format)
 470 {
 471         int i;
 472         int score = 0;
 473
 474         if (fp->channels < 1) {
 475                 snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp);
 476                 return 0;
 477         }
 478
 479         if (!(fp->formats & (1ULL << pcm_format))) {
 480                 snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__,
 481                         fp, pcm_format);
 482                 return 0;
 483         }
 484
 485         for (i = 0; i < fp->nr_rates; i++) {
 486                 if (fp->rate_table[i] == rate) {
 487                         score++;
 488                         break;
 489                 }
 490         }
 491         if (!score) {
 492                 snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__,
 493                         fp, rate);
 494                 return 0;
 495         }
 496
 497         if (fp->channels == match->channels)
 498                 score++;
 499
 500         snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score);
 501
 502         return score;
 503 }
 504
 505 /*
 506  * Configure the sync ep using the rate and pcm format of the data ep.
 507  */
 508 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 509 {
 510         int ret;
 511         struct audioformat *fp;
 512         struct audioformat *sync_fp = NULL;
 513         int cur_score = 0;
 514         int sync_period_bytes = subs->period_bytes;
 515         struct snd_usb_substream *sync_subs =
 516                 &subs->stream->substream[subs->direction ^ 1];
 517
 518         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 519             !subs->stream)
 520                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 521                                                    subs->pcm_format,
 522                                                    subs->channels,
 523                                                    subs->period_bytes,
 524                                                    subs->cur_rate,
 525                                                    subs->cur_audiofmt,
 526                                                    NULL);
 527
 528         /* Try to find the best matching audioformat. */
 529         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 530                 int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
 531                         subs->cur_rate, subs->pcm_format);
 532
 533                 if (score > cur_score) {
 534                         sync_fp = fp;
 535                         cur_score = score;
 536                 }
 537         }
 538
 539         if (unlikely(sync_fp == NULL)) {
 540                 snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
 541                         __func__, sync_subs->ep_num);
 542                 return -EINVAL;
 543         }
 544
 545         /*
 546          * Recalculate the period bytes if channel number differ between
 547          * data and sync ep audioformat.
 548          */
 549         if (sync_fp->channels != subs->channels) {
 550                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 551                         sync_fp->channels;
 552                 snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
 553                         __func__, subs->period_bytes, sync_period_bytes);
 554         }
 555
 556         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 557                                           subs->pcm_format,
 558                                           sync_fp->channels,
 559                                           sync_period_bytes,
 560                                           subs->cur_rate,
 561                                           sync_fp,
 562                                           NULL);
 563
 564         return ret;
 565 }
 566
 567 /*
 568  * configure endpoint params
 569  *
 570  * called  during initial setup and upon resume
 571  */
 572 static int configure_endpoint(struct snd_usb_substream *subs)
 573 {
 574         int ret;
 575
 576         /* format changed */
 577         stop_endpoints(subs, true);
 578         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 579                                           subs->pcm_format,
 580                                           subs->channels,
 581                                           subs->period_bytes,
 582                                           subs->cur_rate,
 583                                           subs->cur_audiofmt,
 584                                           subs->sync_endpoint);
 585         if (ret < 0)
 586                 return ret;
 587
 588         if (subs->sync_endpoint)
 589                 ret = configure_sync_endpoint(subs);
 590
 591         return ret;
 592 }
 593
 594 /*
 595  * hw_params callback
 596  *
 597  * allocate a buffer and set the given audio format.
 598  *
 599  * so far we use a physically linear buffer although packetize transfer
 600  * doesn't need a continuous area.
 601  * if sg buffer is supported on the later version of alsa, we'll follow
 602  * that.
 603  */
 604 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 605                              struct snd_pcm_hw_params *hw_params)
 606 {
 607         struct snd_usb_substream *subs = substream->runtime->private_data;
 608         struct audioformat *fmt;
 609         int ret;
 610
 611         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 612                                                params_buffer_bytes(hw_params));
 613         if (ret < 0)
 614                 return ret;
 615
 616         subs->pcm_format = params_format(hw_params);
 617         subs->period_bytes = params_period_bytes(hw_params);
 618         subs->channels = params_channels(hw_params);
 619         subs->cur_rate = params_rate(hw_params);
 620
 621         fmt = find_format(subs);
 622         if (!fmt) {
 623                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 624                            subs->pcm_format, subs->cur_rate, subs->channels);
 625                 return -EINVAL;
 626         }
 627
 628         down_read(&subs->stream->chip->shutdown_rwsem);
 629         if (subs->stream->chip->shutdown)
 630                 ret = -ENODEV;
 631         else
 632                 ret = set_format(subs, fmt);
 633         up_read(&subs->stream->chip->shutdown_rwsem);
 634         if (ret < 0)
 635                 return ret;
 636
 637         subs->interface = fmt->iface;
 638         subs->altset_idx = fmt->altset_idx;
 639         subs->need_setup_ep = true;
 640
 641         return 0;
 642 }
 643
 644 /*
 645  * hw_free callback
 646  *
 647  * reset the audio format and release the buffer
 648  */
 649 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 650 {
 651         struct snd_usb_substream *subs = substream->runtime->private_data;
 652
 653         subs->cur_audiofmt = NULL;
 654         subs->cur_rate = 0;
 655         subs->period_bytes = 0;
 656         down_read(&subs->stream->chip->shutdown_rwsem);
 657         if (!subs->stream->chip->shutdown) {
 658                 stop_endpoints(subs, true);
 659                 deactivate_endpoints(subs);
 660         }
 661         up_read(&subs->stream->chip->shutdown_rwsem);
 662         return snd_pcm_lib_free_vmalloc_buffer(substream);
 663 }
 664
 665 /*
 666  * prepare callback
 667  *
 668  * only a few subtle things...
 669  */
 670 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 671 {
 672         struct snd_pcm_runtime *runtime = substream->runtime;
 673         struct snd_usb_substream *subs = runtime->private_data;
 674         struct usb_host_interface *alts;
 675         struct usb_interface *iface;
 676         int ret;
 677
 678         if (! subs->cur_audiofmt) {
 679                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 680                 return -ENXIO;
 681         }
 682
 683         down_read(&subs->stream->chip->shutdown_rwsem);
 684         if (subs->stream->chip->shutdown) {
 685                 ret = -ENODEV;
 686                 goto unlock;
 687         }
 688         if (snd_BUG_ON(!subs->data_endpoint)) {
 689                 ret = -EIO;
 690                 goto unlock;
 691         }
 692
 693         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 694         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 695
 696         ret = set_format(subs, subs->cur_audiofmt);
 697         if (ret < 0)
 698                 goto unlock;
 699
 700         iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 701         alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 702         ret = snd_usb_init_sample_rate(subs->stream->chip,
 703                                        subs->cur_audiofmt->iface,
 704                                        alts,
 705                                        subs->cur_audiofmt,
 706                                        subs->cur_rate);
 707         if (ret < 0)
 708                 goto unlock;
 709
 710         if (subs->need_setup_ep) {
 711                 ret = configure_endpoint(subs);
 712                 if (ret < 0)
 713                         goto unlock;
 714                 subs->need_setup_ep = false;
 715         }
 716
 717         /* some unit conversions in runtime */
 718         subs->data_endpoint->maxframesize =
 719                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 720         subs->data_endpoint->curframesize =
 721                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 722
 723         /* reset the pointer */
 724         subs->hwptr_done = 0;
 725         subs->transfer_done = 0;
 726         subs->last_delay = 0;
 727         subs->last_frame_number = 0;
 728         runtime->delay = 0;
 729
 730         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 731          * updates for all URBs would happen at the same time when starting */
 732         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 733                 ret = start_endpoints(subs, true);
 734
 735  unlock:
 736         up_read(&subs->stream->chip->shutdown_rwsem);
 737         return ret;
 738 }
 739
 740 static struct snd_pcm_hardware snd_usb_hardware =
 741 {
 742         .info =                 SNDRV_PCM_INFO_MMAP |
 743                                 SNDRV_PCM_INFO_MMAP_VALID |
 744                                 SNDRV_PCM_INFO_BATCH |
 745                                 SNDRV_PCM_INFO_INTERLEAVED |
 746                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 747                                 SNDRV_PCM_INFO_PAUSE,
 748         .buffer_bytes_max =     1024 * 1024,
 749         .period_bytes_min =     64,
 750         .period_bytes_max =     512 * 1024,
 751         .periods_min =          2,
 752         .periods_max =          1024,
 753 };
 754
 755 static int hw_check_valid_format(struct snd_usb_substream *subs,
 756                                  struct snd_pcm_hw_params *params,
 757                                  struct audioformat *fp)
 758 {
 759         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 760         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 761         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 762         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 763         struct snd_mask check_fmts;
 764         unsigned int ptime;
 765
 766         /* check the format */
 767         snd_mask_none(&check_fmts);
 768         check_fmts.bits[0] = (u32)fp->formats;
 769         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 770         snd_mask_intersect(&check_fmts, fmts);
 771         if (snd_mask_empty(&check_fmts)) {
 772                 hwc_debug("   > check: no supported format %d\n", fp->format);
 773                 return 0;
 774         }
 775         /* check the channels */
 776         if (fp->channels < ct->min || fp->channels > ct->max) {
 777                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 778                 return 0;
 779         }
 780         /* check the rate is within the range */
 781         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 782                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 783                 return 0;
 784         }
 785         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 786                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 787                 return 0;
 788         }
 789         /* check whether the period time is >= the data packet interval */
 790         if (subs->speed != USB_SPEED_FULL) {
 791                 ptime = 125 * (1 << fp->datainterval);
 792                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 793                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 794                         return 0;
 795                 }
 796         }
 797         return 1;
 798 }
 799
 800 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 801                         struct snd_pcm_hw_rule *rule)
 802 {
 803         struct snd_usb_substream *subs = rule->private;
 804         struct list_head *p;
 805         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 806         unsigned int rmin, rmax;
 807         int changed;
 808
 809         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 810         changed = 0;
 811         rmin = rmax = 0;
 812         list_for_each(p, &subs->fmt_list) {
 813                 struct audioformat *fp;
 814                 fp = list_entry(p, struct audioformat, list);
 815                 if (!hw_check_valid_format(subs, params, fp))
 816                         continue;
 817                 if (changed++) {
 818                         if (rmin > fp->rate_min)
 819                                 rmin = fp->rate_min;
 820                         if (rmax < fp->rate_max)
 821                                 rmax = fp->rate_max;
 822                 } else {
 823                         rmin = fp->rate_min;
 824                         rmax = fp->rate_max;
 825                 }
 826         }
 827
 828         if (!changed) {
 829                 hwc_debug("  --> get empty\n");
 830                 it->empty = 1;
 831                 return -EINVAL;
 832         }
 833
 834         changed = 0;
 835         if (it->min < rmin) {
 836                 it->min = rmin;
 837                 it->openmin = 0;
 838                 changed = 1;
 839         }
 840         if (it->max > rmax) {
 841                 it->max = rmax;
 842                 it->openmax = 0;
 843                 changed = 1;
 844         }
 845         if (snd_interval_checkempty(it)) {
 846                 it->empty = 1;
 847                 return -EINVAL;
 848         }
 849         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 850         return changed;
 851 }
 852
 853
 854 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 855                             struct snd_pcm_hw_rule *rule)
 856 {
 857         struct snd_usb_substream *subs = rule->private;
 858         struct list_head *p;
 859         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 860         unsigned int rmin, rmax;
 861         int changed;
 862
 863         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 864         changed = 0;
 865         rmin = rmax = 0;
 866         list_for_each(p, &subs->fmt_list) {
 867                 struct audioformat *fp;
 868                 fp = list_entry(p, struct audioformat, list);
 869                 if (!hw_check_valid_format(subs, params, fp))
 870                         continue;
 871                 if (changed++) {
 872                         if (rmin > fp->channels)
 873                                 rmin = fp->channels;
 874                         if (rmax < fp->channels)
 875                                 rmax = fp->channels;
 876                 } else {
 877                         rmin = fp->channels;
 878                         rmax = fp->channels;
 879                 }
 880         }
 881
 882         if (!changed) {
 883                 hwc_debug("  --> get empty\n");
 884                 it->empty = 1;
 885                 return -EINVAL;
 886         }
 887
 888         changed = 0;
 889         if (it->min < rmin) {
 890                 it->min = rmin;
 891                 it->openmin = 0;
 892                 changed = 1;
 893         }
 894         if (it->max > rmax) {
 895                 it->max = rmax;
 896                 it->openmax = 0;
 897                 changed = 1;
 898         }
 899         if (snd_interval_checkempty(it)) {
 900                 it->empty = 1;
 901                 return -EINVAL;
 902         }
 903         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 904         return changed;
 905 }
 906
 907 static int hw_rule_format(struct snd_pcm_hw_params *params,
 908                           struct snd_pcm_hw_rule *rule)
 909 {
 910         struct snd_usb_substream *subs = rule->private;
 911         struct list_head *p;
 912         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 913         u64 fbits;
 914         u32 oldbits[2];
 915         int changed;
 916
 917         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 918         fbits = 0;
 919         list_for_each(p, &subs->fmt_list) {
 920                 struct audioformat *fp;
 921                 fp = list_entry(p, struct audioformat, list);
 922                 if (!hw_check_valid_format(subs, params, fp))
 923                         continue;
 924                 fbits |= fp->formats;
 925         }
 926
 927         oldbits[0] = fmt->bits[0];
 928         oldbits[1] = fmt->bits[1];
 929         fmt->bits[0] &= (u32)fbits;
 930         fmt->bits[1] &= (u32)(fbits >> 32);
 931         if (!fmt->bits[0] && !fmt->bits[1]) {
 932                 hwc_debug("  --> get empty\n");
 933                 return -EINVAL;
 934         }
 935         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 936         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 937         return changed;
 938 }
 939
 940 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 941                                struct snd_pcm_hw_rule *rule)
 942 {
 943         struct snd_usb_substream *subs = rule->private;
 944         struct audioformat *fp;
 945         struct snd_interval *it;
 946         unsigned char min_datainterval;
 947         unsigned int pmin;
 948         int changed;
 949
 950         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 951         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 952         min_datainterval = 0xff;
 953         list_for_each_entry(fp, &subs->fmt_list, list) {
 954                 if (!hw_check_valid_format(subs, params, fp))
 955                         continue;
 956                 min_datainterval = min(min_datainterval, fp->datainterval);
 957         }
 958         if (min_datainterval == 0xff) {
 959                 hwc_debug("  --> get empty\n");
 960                 it->empty = 1;
 961                 return -EINVAL;
 962         }
 963         pmin = 125 * (1 << min_datainterval);
 964         changed = 0;
 965         if (it->min < pmin) {
 966                 it->min = pmin;
 967                 it->openmin = 0;
 968                 changed = 1;
 969         }
 970         if (snd_interval_checkempty(it)) {
 971                 it->empty = 1;
 972                 return -EINVAL;
 973         }
 974         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 975         return changed;
 976 }
 977
 978 /*
 979  *  If the device supports unusual bit rates, does the request meet these?
 980  */
 981 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 982                                   struct snd_usb_substream *subs)
 983 {
 984         struct audioformat *fp;
 985         int *rate_list;
 986         int count = 0, needs_knot = 0;
 987         int err;
 988
 989         kfree(subs->rate_list.list);
 990         subs->rate_list.list = NULL;
 991
 992         list_for_each_entry(fp, &subs->fmt_list, list) {
 993                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 994                         return 0;
 995                 count += fp->nr_rates;
 996                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 997                         needs_knot = 1;
 998         }
 999         if (!needs_knot)
1000                 return 0;
1001
1002         subs->rate_list.list = rate_list =
1003                 kmalloc(sizeof(int) * count, GFP_KERNEL);
1004         if (!subs->rate_list.list)
1005                 return -ENOMEM;
1006         subs->rate_list.count = count;
1007         subs->rate_list.mask = 0;
1008         count = 0;
1009         list_for_each_entry(fp, &subs->fmt_list, list) {
1010                 int i;
1011                 for (i = 0; i < fp->nr_rates; i++)
1012                         rate_list[count++] = fp->rate_table[i];
1013         }
1014         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1015                                          &subs->rate_list);
1016         if (err < 0)
1017                 return err;
1018
1019         return 0;
1020 }
1021
1022
1023 /*
1024  * set up the runtime hardware information.
1025  */
1026
1027 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1028 {
1029         struct list_head *p;
1030         unsigned int pt, ptmin;
1031         int param_period_time_if_needed;
1032         int err;
1033
1034         runtime->hw.formats = subs->formats;
1035
1036         runtime->hw.rate_min = 0x7fffffff;
1037         runtime->hw.rate_max = 0;
1038         runtime->hw.channels_min = 256;
1039         runtime->hw.channels_max = 0;
1040         runtime->hw.rates = 0;
1041         ptmin = UINT_MAX;
1042         /* check min/max rates and channels */
1043         list_for_each(p, &subs->fmt_list) {
1044                 struct audioformat *fp;
1045                 fp = list_entry(p, struct audioformat, list);
1046                 runtime->hw.rates |= fp->rates;
1047                 if (runtime->hw.rate_min > fp->rate_min)
1048                         runtime->hw.rate_min = fp->rate_min;
1049                 if (runtime->hw.rate_max < fp->rate_max)
1050                         runtime->hw.rate_max = fp->rate_max;
1051                 if (runtime->hw.channels_min > fp->channels)
1052                         runtime->hw.channels_min = fp->channels;
1053                 if (runtime->hw.channels_max < fp->channels)
1054                         runtime->hw.channels_max = fp->channels;
1055                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1056                         /* FIXME: there might be more than one audio formats... */
1057                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1058                                 fp->frame_size;
1059                 }
1060                 pt = 125 * (1 << fp->datainterval);
1061                 ptmin = min(ptmin, pt);
1062         }
1063         err = snd_usb_autoresume(subs->stream->chip);
1064         if (err < 0)
1065                 return err;
1066
1067         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1068         if (subs->speed == USB_SPEED_FULL)
1069                 /* full speed devices have fixed data packet interval */
1070                 ptmin = 1000;
1071         if (ptmin == 1000)
1072                 /* if period time doesn't go below 1 ms, no rules needed */
1073                 param_period_time_if_needed = -1;
1074         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1075                                      ptmin, UINT_MAX);
1076
1077         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1078                                        hw_rule_rate, subs,
1079                                        SNDRV_PCM_HW_PARAM_FORMAT,
1080                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1081                                        param_period_time_if_needed,
1082                                        -1)) < 0)
1083                 goto rep_err;
1084         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1085                                        hw_rule_channels, subs,
1086                                        SNDRV_PCM_HW_PARAM_FORMAT,
1087                                        SNDRV_PCM_HW_PARAM_RATE,
1088                                        param_period_time_if_needed,
1089                                        -1)) < 0)
1090                 goto rep_err;
1091         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1092                                        hw_rule_format, subs,
1093                                        SNDRV_PCM_HW_PARAM_RATE,
1094                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1095                                        param_period_time_if_needed,
1096                                        -1)) < 0)
1097                 goto rep_err;
1098         if (param_period_time_if_needed >= 0) {
1099                 err = snd_pcm_hw_rule_add(runtime, 0,
1100                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1101                                           hw_rule_period_time, subs,
1102                                           SNDRV_PCM_HW_PARAM_FORMAT,
1103                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1104                                           SNDRV_PCM_HW_PARAM_RATE,
1105                                           -1);
1106                 if (err < 0)
1107                         goto rep_err;
1108         }
1109         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1110                 goto rep_err;
1111         return 0;
1112
1113 rep_err:
1114         snd_usb_autosuspend(subs->stream->chip);
1115         return err;
1116 }
1117
1118 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1119 {
1120         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1121         struct snd_pcm_runtime *runtime = substream->runtime;
1122         struct snd_usb_substream *subs = &as->substream[direction];
1123
1124         subs->interface = -1;
1125         subs->altset_idx = 0;
1126         runtime->hw = snd_usb_hardware;
1127         runtime->private_data = subs;
1128         subs->pcm_substream = substream;
1129         /* runtime PM is also done there */
1130         return setup_hw_info(runtime, subs);
1131 }
1132
1133 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1134 {
1135         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1136         struct snd_usb_substream *subs = &as->substream[direction];
1137
1138         stop_endpoints(subs, true);
1139
1140         if (!as->chip->shutdown && subs->interface >= 0) {
1141                 usb_set_interface(subs->dev, subs->interface, 0);
1142                 subs->interface = -1;
1143         }
1144
1145         subs->pcm_substream = NULL;
1146         snd_usb_autosuspend(subs->stream->chip);
1147
1148         return 0;
1149 }
1150
1151 /* Since a URB can handle only a single linear buffer, we must use double
1152  * buffering when the data to be transferred overflows the buffer boundary.
1153  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1154  * for all URBs.
1155  */
1156 static void retire_capture_urb(struct snd_usb_substream *subs,
1157                                struct urb *urb)
1158 {
1159         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1160         unsigned int stride, frames, bytes, oldptr;
1161         int i, period_elapsed = 0;
1162         unsigned long flags;
1163         unsigned char *cp;
1164         int current_frame_number;
1165
1166         /* read frame number here, update pointer in critical section */
1167         current_frame_number = usb_get_current_frame_number(subs->dev);
1168
1169         stride = runtime->frame_bits >> 3;
1170
1171         for (i = 0; i < urb->number_of_packets; i++) {
1172                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1173                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1174                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1175                         // continue;
1176                 }
1177                 bytes = urb->iso_frame_desc[i].actual_length;
1178                 frames = bytes / stride;
1179                 if (!subs->txfr_quirk)
1180                         bytes = frames * stride;
1181                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1182                         int oldbytes = bytes;
1183                         bytes = frames * stride;
1184                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1185                                                         oldbytes, bytes);
1186                 }
1187                 /* update the current pointer */
1188                 spin_lock_irqsave(&subs->lock, flags);
1189                 oldptr = subs->hwptr_done;
1190                 subs->hwptr_done += bytes;
1191                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1192                         subs->hwptr_done -= runtime->buffer_size * stride;
1193                 frames = (bytes + (oldptr % stride)) / stride;
1194                 subs->transfer_done += frames;
1195                 if (subs->transfer_done >= runtime->period_size) {
1196                         subs->transfer_done -= runtime->period_size;
1197                         period_elapsed = 1;
1198                 }
1199                 /* capture delay is by construction limited to one URB,
1200                  * reset delays here
1201                  */
1202                 runtime->delay = subs->last_delay = 0;
1203
1204                 /* realign last_frame_number */
1205                 subs->last_frame_number = current_frame_number;
1206                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1207
1208                 spin_unlock_irqrestore(&subs->lock, flags);
1209                 /* copy a data chunk */
1210                 if (oldptr + bytes > runtime->buffer_size * stride) {
1211                         unsigned int bytes1 =
1212                                         runtime->buffer_size * stride - oldptr;
1213                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1214                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1215                 } else {
1216                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1217                 }
1218         }
1219
1220         if (period_elapsed)
1221                 snd_pcm_period_elapsed(subs->pcm_substream);
1222 }
1223
1224 static void prepare_playback_urb(struct snd_usb_substream *subs,
1225                                  struct urb *urb)
1226 {
1227         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1228         struct snd_usb_endpoint *ep = subs->data_endpoint;
1229         struct snd_urb_ctx *ctx = urb->context;
1230         unsigned int counts, frames, bytes;
1231         int i, stride, period_elapsed = 0;
1232         unsigned long flags;
1233
1234         stride = runtime->frame_bits >> 3;
1235
1236         frames = 0;
1237         urb->number_of_packets = 0;
1238         spin_lock_irqsave(&subs->lock, flags);
1239         for (i = 0; i < ctx->packets; i++) {
1240                 if (ctx->packet_size[i])
1241                         counts = ctx->packet_size[i];
1242                 else
1243                         counts = snd_usb_endpoint_next_packet_size(ep);
1244
1245                 /* set up descriptor */
1246                 urb->iso_frame_desc[i].offset = frames * stride;
1247                 urb->iso_frame_desc[i].length = counts * stride;
1248                 frames += counts;
1249                 urb->number_of_packets++;
1250                 subs->transfer_done += counts;
1251                 if (subs->transfer_done >= runtime->period_size) {
1252                         subs->transfer_done -= runtime->period_size;
1253                         period_elapsed = 1;
1254                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1255                                 if (subs->transfer_done > 0) {
1256                                         /* FIXME: fill-max mode is not
1257                                          * supported yet */
1258                                         frames -= subs->transfer_done;
1259                                         counts -= subs->transfer_done;
1260                                         urb->iso_frame_desc[i].length =
1261                                                 counts * stride;
1262                                         subs->transfer_done = 0;
1263                                 }
1264                                 i++;
1265                                 if (i < ctx->packets) {
1266                                         /* add a transfer delimiter */
1267                                         urb->iso_frame_desc[i].offset =
1268                                                 frames * stride;
1269                                         urb->iso_frame_desc[i].length = 0;
1270                                         urb->number_of_packets++;
1271                                 }
1272                                 break;
1273                         }
1274                 }
1275                 if (period_elapsed &&
1276                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1277                         break;
1278         }
1279         bytes = frames * stride;
1280         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1281                 /* err, the transferred area goes over buffer boundary. */
1282                 unsigned int bytes1 =
1283                         runtime->buffer_size * stride - subs->hwptr_done;
1284                 memcpy(urb->transfer_buffer,
1285                        runtime->dma_area + subs->hwptr_done, bytes1);
1286                 memcpy(urb->transfer_buffer + bytes1,
1287                        runtime->dma_area, bytes - bytes1);
1288         } else {
1289                 memcpy(urb->transfer_buffer,
1290                        runtime->dma_area + subs->hwptr_done, bytes);
1291         }
1292         subs->hwptr_done += bytes;
1293         if (subs->hwptr_done >= runtime->buffer_size * stride)
1294                 subs->hwptr_done -= runtime->buffer_size * stride;
1295
1296         /* update delay with exact number of samples queued */
1297         runtime->delay = subs->last_delay;
1298         runtime->delay += frames;
1299         subs->last_delay = runtime->delay;
1300
1301         /* realign last_frame_number */
1302         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1303         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1304
1305         spin_unlock_irqrestore(&subs->lock, flags);
1306         urb->transfer_buffer_length = bytes;
1307         if (period_elapsed)
1308                 snd_pcm_period_elapsed(subs->pcm_substream);
1309 }
1310
1311 /*
1312  * process after playback data complete
1313  * - decrease the delay count again
1314  */
1315 static void retire_playback_urb(struct snd_usb_substream *subs,
1316                                struct urb *urb)
1317 {
1318         unsigned long flags;
1319         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1320         int stride = runtime->frame_bits >> 3;
1321         int processed = urb->transfer_buffer_length / stride;
1322         int est_delay;
1323
1324         /* ignore the delay accounting when procssed=0 is given, i.e.
1325          * silent payloads are procssed before handling the actual data
1326          */
1327         if (!processed)
1328                 return;
1329
1330         spin_lock_irqsave(&subs->lock, flags);
1331         if (!subs->last_delay)
1332                 goto out; /* short path */
1333
1334         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1335         /* update delay with exact number of samples played */
1336         if (processed > subs->last_delay)
1337                 subs->last_delay = 0;
1338         else
1339                 subs->last_delay -= processed;
1340         runtime->delay = subs->last_delay;
1341
1342         /*
1343          * Report when delay estimate is off by more than 2ms.
1344          * The error should be lower than 2ms since the estimate relies
1345          * on two reads of a counter updated every ms.
1346          */
1347         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1348                 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1349                         est_delay, subs->last_delay);
1350
1351         if (!subs->running) {
1352                 /* update last_frame_number for delay counting here since
1353                  * prepare_playback_urb won't be called during pause
1354                  */
1355                 subs->last_frame_number =
1356                         usb_get_current_frame_number(subs->dev) & 0xff;
1357         }
1358
1359  out:
1360         spin_unlock_irqrestore(&subs->lock, flags);
1361 }
1362
1363 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1364 {
1365         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1366 }
1367
1368 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1369 {
1370         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1371 }
1372
1373 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1374 {
1375         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1376 }
1377
1378 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1379 {
1380         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1381 }
1382
1383 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1384                                               int cmd)
1385 {
1386         struct snd_usb_substream *subs = substream->runtime->private_data;
1387
1388         switch (cmd) {
1389         case SNDRV_PCM_TRIGGER_START:
1390         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1391                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1392                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1393                 subs->running = 1;
1394                 return 0;
1395         case SNDRV_PCM_TRIGGER_STOP:
1396                 stop_endpoints(subs, false);
1397                 subs->running = 0;
1398                 return 0;
1399         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1400                 subs->data_endpoint->prepare_data_urb = NULL;
1401                 /* keep retire_data_urb for delay calculation */
1402                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1403                 subs->running = 0;
1404                 return 0;
1405         }
1406
1407         return -EINVAL;
1408 }
1409
1410 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1411                                              int cmd)
1412 {
1413         int err;
1414         struct snd_usb_substream *subs = substream->runtime->private_data;
1415
1416         switch (cmd) {
1417         case SNDRV_PCM_TRIGGER_START:
1418                 err = start_endpoints(subs, false);
1419                 if (err < 0)
1420                         return err;
1421
1422                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1423                 subs->running = 1;
1424                 return 0;
1425         case SNDRV_PCM_TRIGGER_STOP:
1426                 stop_endpoints(subs, false);
1427                 subs->running = 0;
1428                 return 0;
1429         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1430                 subs->data_endpoint->retire_data_urb = NULL;
1431                 subs->running = 0;
1432                 return 0;
1433         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1434                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1435                 subs->running = 1;
1436                 return 0;
1437         }
1438
1439         return -EINVAL;
1440 }
1441
1442 static struct snd_pcm_ops snd_usb_playback_ops = {
1443         .open =         snd_usb_playback_open,
1444         .close =        snd_usb_playback_close,
1445         .ioctl =        snd_pcm_lib_ioctl,
1446         .hw_params =    snd_usb_hw_params,
1447         .hw_free =      snd_usb_hw_free,
1448         .prepare =      snd_usb_pcm_prepare,
1449         .trigger =      snd_usb_substream_playback_trigger,
1450         .pointer =      snd_usb_pcm_pointer,
1451         .page =         snd_pcm_lib_get_vmalloc_page,
1452         .mmap =         snd_pcm_lib_mmap_vmalloc,
1453 };
1454
1455 static struct snd_pcm_ops snd_usb_capture_ops = {
1456         .open =         snd_usb_capture_open,
1457         .close =        snd_usb_capture_close,
1458         .ioctl =        snd_pcm_lib_ioctl,
1459         .hw_params =    snd_usb_hw_params,
1460         .hw_free =      snd_usb_hw_free,
1461         .prepare =      snd_usb_pcm_prepare,
1462         .trigger =      snd_usb_substream_capture_trigger,
1463         .pointer =      snd_usb_pcm_pointer,
1464         .page =         snd_pcm_lib_get_vmalloc_page,
1465         .mmap =         snd_pcm_lib_mmap_vmalloc,
1466 };
1467
1468 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1469 {
1470         snd_pcm_set_ops(pcm, stream,
1471                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1472                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1473 }