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         /* Try to find the best matching audioformat. */
 515         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 516                 int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
 517                         subs->cur_rate, subs->pcm_format);
 518
 519                 if (score > cur_score) {
 520                         sync_fp = fp;
 521                         cur_score = score;
 522                 }
 523         }
 524
 525         if (unlikely(sync_fp == NULL)) {
 526                 snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
 527                         __func__, sync_subs->ep_num);
 528                 return -EINVAL;
 529         }
 530
 531         /*
 532          * Recalculate the period bytes if channel number differ between
 533          * data and sync ep audioformat.
 534          */
 535         if (sync_fp->channels != subs->channels) {
 536                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 537                         sync_fp->channels;
 538                 snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
 539                         __func__, subs->period_bytes, sync_period_bytes);
 540         }
 541
 542         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 543                                           subs->pcm_format,
 544                                           sync_fp->channels,
 545                                           sync_period_bytes,
 546                                           subs->cur_rate,
 547                                           sync_fp,
 548                                           NULL);
 549
 550         return ret;
 551 }
 552
 553 /*
 554  * configure endpoint params
 555  *
 556  * called  during initial setup and upon resume
 557  */
 558 static int configure_endpoint(struct snd_usb_substream *subs)
 559 {
 560         int ret;
 561
 562         /* format changed */
 563         stop_endpoints(subs, true);
 564         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 565                                           subs->pcm_format,
 566                                           subs->channels,
 567                                           subs->period_bytes,
 568                                           subs->cur_rate,
 569                                           subs->cur_audiofmt,
 570                                           subs->sync_endpoint);
 571         if (ret < 0)
 572                 return ret;
 573
 574         if (subs->sync_endpoint)
 575                 ret = configure_sync_endpoint(subs);
 576
 577         return ret;
 578 }
 579
 580 /*
 581  * hw_params callback
 582  *
 583  * allocate a buffer and set the given audio format.
 584  *
 585  * so far we use a physically linear buffer although packetize transfer
 586  * doesn't need a continuous area.
 587  * if sg buffer is supported on the later version of alsa, we'll follow
 588  * that.
 589  */
 590 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 591                              struct snd_pcm_hw_params *hw_params)
 592 {
 593         struct snd_usb_substream *subs = substream->runtime->private_data;
 594         struct audioformat *fmt;
 595         int ret;
 596
 597         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 598                                                params_buffer_bytes(hw_params));
 599         if (ret < 0)
 600                 return ret;
 601
 602         subs->pcm_format = params_format(hw_params);
 603         subs->period_bytes = params_period_bytes(hw_params);
 604         subs->channels = params_channels(hw_params);
 605         subs->cur_rate = params_rate(hw_params);
 606
 607         fmt = find_format(subs);
 608         if (!fmt) {
 609                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 610                            subs->pcm_format, subs->cur_rate, subs->channels);
 611                 return -EINVAL;
 612         }
 613
 614         down_read(&subs->stream->chip->shutdown_rwsem);
 615         if (subs->stream->chip->shutdown)
 616                 ret = -ENODEV;
 617         else
 618                 ret = set_format(subs, fmt);
 619         up_read(&subs->stream->chip->shutdown_rwsem);
 620         if (ret < 0)
 621                 return ret;
 622
 623         subs->interface = fmt->iface;
 624         subs->altset_idx = fmt->altset_idx;
 625         subs->need_setup_ep = true;
 626
 627         return 0;
 628 }
 629
 630 /*
 631  * hw_free callback
 632  *
 633  * reset the audio format and release the buffer
 634  */
 635 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 636 {
 637         struct snd_usb_substream *subs = substream->runtime->private_data;
 638
 639         subs->cur_audiofmt = NULL;
 640         subs->cur_rate = 0;
 641         subs->period_bytes = 0;
 642         down_read(&subs->stream->chip->shutdown_rwsem);
 643         if (!subs->stream->chip->shutdown) {
 644                 stop_endpoints(subs, true);
 645                 deactivate_endpoints(subs);
 646         }
 647         up_read(&subs->stream->chip->shutdown_rwsem);
 648         return snd_pcm_lib_free_vmalloc_buffer(substream);
 649 }
 650
 651 /*
 652  * prepare callback
 653  *
 654  * only a few subtle things...
 655  */
 656 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 657 {
 658         struct snd_pcm_runtime *runtime = substream->runtime;
 659         struct snd_usb_substream *subs = runtime->private_data;
 660         struct usb_host_interface *alts;
 661         struct usb_interface *iface;
 662         int ret;
 663
 664         if (! subs->cur_audiofmt) {
 665                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 666                 return -ENXIO;
 667         }
 668
 669         down_read(&subs->stream->chip->shutdown_rwsem);
 670         if (subs->stream->chip->shutdown) {
 671                 ret = -ENODEV;
 672                 goto unlock;
 673         }
 674         if (snd_BUG_ON(!subs->data_endpoint)) {
 675                 ret = -EIO;
 676                 goto unlock;
 677         }
 678
 679         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 680         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 681
 682         ret = set_format(subs, subs->cur_audiofmt);
 683         if (ret < 0)
 684                 goto unlock;
 685
 686         iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 687         alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 688         ret = snd_usb_init_sample_rate(subs->stream->chip,
 689                                        subs->cur_audiofmt->iface,
 690                                        alts,
 691                                        subs->cur_audiofmt,
 692                                        subs->cur_rate);
 693         if (ret < 0)
 694                 goto unlock;
 695
 696         if (subs->need_setup_ep) {
 697                 ret = configure_endpoint(subs);
 698                 if (ret < 0)
 699                         goto unlock;
 700                 subs->need_setup_ep = false;
 701         }
 702
 703         /* some unit conversions in runtime */
 704         subs->data_endpoint->maxframesize =
 705                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 706         subs->data_endpoint->curframesize =
 707                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 708
 709         /* reset the pointer */
 710         subs->hwptr_done = 0;
 711         subs->transfer_done = 0;
 712         subs->last_delay = 0;
 713         subs->last_frame_number = 0;
 714         runtime->delay = 0;
 715
 716         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 717          * updates for all URBs would happen at the same time when starting */
 718         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 719                 ret = start_endpoints(subs, true);
 720
 721  unlock:
 722         up_read(&subs->stream->chip->shutdown_rwsem);
 723         return ret;
 724 }
 725
 726 static struct snd_pcm_hardware snd_usb_hardware =
 727 {
 728         .info =                 SNDRV_PCM_INFO_MMAP |
 729                                 SNDRV_PCM_INFO_MMAP_VALID |
 730                                 SNDRV_PCM_INFO_BATCH |
 731                                 SNDRV_PCM_INFO_INTERLEAVED |
 732                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 733                                 SNDRV_PCM_INFO_PAUSE,
 734         .buffer_bytes_max =     1024 * 1024,
 735         .period_bytes_min =     64,
 736         .period_bytes_max =     512 * 1024,
 737         .periods_min =          2,
 738         .periods_max =          1024,
 739 };
 740
 741 static int hw_check_valid_format(struct snd_usb_substream *subs,
 742                                  struct snd_pcm_hw_params *params,
 743                                  struct audioformat *fp)
 744 {
 745         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 746         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 747         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 748         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 749         struct snd_mask check_fmts;
 750         unsigned int ptime;
 751
 752         /* check the format */
 753         snd_mask_none(&check_fmts);
 754         check_fmts.bits[0] = (u32)fp->formats;
 755         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 756         snd_mask_intersect(&check_fmts, fmts);
 757         if (snd_mask_empty(&check_fmts)) {
 758                 hwc_debug("   > check: no supported format %d\n", fp->format);
 759                 return 0;
 760         }
 761         /* check the channels */
 762         if (fp->channels < ct->min || fp->channels > ct->max) {
 763                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 764                 return 0;
 765         }
 766         /* check the rate is within the range */
 767         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 768                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 769                 return 0;
 770         }
 771         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 772                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 773                 return 0;
 774         }
 775         /* check whether the period time is >= the data packet interval */
 776         if (subs->speed != USB_SPEED_FULL) {
 777                 ptime = 125 * (1 << fp->datainterval);
 778                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 779                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 780                         return 0;
 781                 }
 782         }
 783         return 1;
 784 }
 785
 786 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 787                         struct snd_pcm_hw_rule *rule)
 788 {
 789         struct snd_usb_substream *subs = rule->private;
 790         struct list_head *p;
 791         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 792         unsigned int rmin, rmax;
 793         int changed;
 794
 795         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 796         changed = 0;
 797         rmin = rmax = 0;
 798         list_for_each(p, &subs->fmt_list) {
 799                 struct audioformat *fp;
 800                 fp = list_entry(p, struct audioformat, list);
 801                 if (!hw_check_valid_format(subs, params, fp))
 802                         continue;
 803                 if (changed++) {
 804                         if (rmin > fp->rate_min)
 805                                 rmin = fp->rate_min;
 806                         if (rmax < fp->rate_max)
 807                                 rmax = fp->rate_max;
 808                 } else {
 809                         rmin = fp->rate_min;
 810                         rmax = fp->rate_max;
 811                 }
 812         }
 813
 814         if (!changed) {
 815                 hwc_debug("  --> get empty\n");
 816                 it->empty = 1;
 817                 return -EINVAL;
 818         }
 819
 820         changed = 0;
 821         if (it->min < rmin) {
 822                 it->min = rmin;
 823                 it->openmin = 0;
 824                 changed = 1;
 825         }
 826         if (it->max > rmax) {
 827                 it->max = rmax;
 828                 it->openmax = 0;
 829                 changed = 1;
 830         }
 831         if (snd_interval_checkempty(it)) {
 832                 it->empty = 1;
 833                 return -EINVAL;
 834         }
 835         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 836         return changed;
 837 }
 838
 839
 840 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 841                             struct snd_pcm_hw_rule *rule)
 842 {
 843         struct snd_usb_substream *subs = rule->private;
 844         struct list_head *p;
 845         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 846         unsigned int rmin, rmax;
 847         int changed;
 848
 849         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 850         changed = 0;
 851         rmin = rmax = 0;
 852         list_for_each(p, &subs->fmt_list) {
 853                 struct audioformat *fp;
 854                 fp = list_entry(p, struct audioformat, list);
 855                 if (!hw_check_valid_format(subs, params, fp))
 856                         continue;
 857                 if (changed++) {
 858                         if (rmin > fp->channels)
 859                                 rmin = fp->channels;
 860                         if (rmax < fp->channels)
 861                                 rmax = fp->channels;
 862                 } else {
 863                         rmin = fp->channels;
 864                         rmax = fp->channels;
 865                 }
 866         }
 867
 868         if (!changed) {
 869                 hwc_debug("  --> get empty\n");
 870                 it->empty = 1;
 871                 return -EINVAL;
 872         }
 873
 874         changed = 0;
 875         if (it->min < rmin) {
 876                 it->min = rmin;
 877                 it->openmin = 0;
 878                 changed = 1;
 879         }
 880         if (it->max > rmax) {
 881                 it->max = rmax;
 882                 it->openmax = 0;
 883                 changed = 1;
 884         }
 885         if (snd_interval_checkempty(it)) {
 886                 it->empty = 1;
 887                 return -EINVAL;
 888         }
 889         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 890         return changed;
 891 }
 892
 893 static int hw_rule_format(struct snd_pcm_hw_params *params,
 894                           struct snd_pcm_hw_rule *rule)
 895 {
 896         struct snd_usb_substream *subs = rule->private;
 897         struct list_head *p;
 898         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 899         u64 fbits;
 900         u32 oldbits[2];
 901         int changed;
 902
 903         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 904         fbits = 0;
 905         list_for_each(p, &subs->fmt_list) {
 906                 struct audioformat *fp;
 907                 fp = list_entry(p, struct audioformat, list);
 908                 if (!hw_check_valid_format(subs, params, fp))
 909                         continue;
 910                 fbits |= fp->formats;
 911         }
 912
 913         oldbits[0] = fmt->bits[0];
 914         oldbits[1] = fmt->bits[1];
 915         fmt->bits[0] &= (u32)fbits;
 916         fmt->bits[1] &= (u32)(fbits >> 32);
 917         if (!fmt->bits[0] && !fmt->bits[1]) {
 918                 hwc_debug("  --> get empty\n");
 919                 return -EINVAL;
 920         }
 921         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 922         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 923         return changed;
 924 }
 925
 926 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 927                                struct snd_pcm_hw_rule *rule)
 928 {
 929         struct snd_usb_substream *subs = rule->private;
 930         struct audioformat *fp;
 931         struct snd_interval *it;
 932         unsigned char min_datainterval;
 933         unsigned int pmin;
 934         int changed;
 935
 936         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 937         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 938         min_datainterval = 0xff;
 939         list_for_each_entry(fp, &subs->fmt_list, list) {
 940                 if (!hw_check_valid_format(subs, params, fp))
 941                         continue;
 942                 min_datainterval = min(min_datainterval, fp->datainterval);
 943         }
 944         if (min_datainterval == 0xff) {
 945                 hwc_debug("  --> get empty\n");
 946                 it->empty = 1;
 947                 return -EINVAL;
 948         }
 949         pmin = 125 * (1 << min_datainterval);
 950         changed = 0;
 951         if (it->min < pmin) {
 952                 it->min = pmin;
 953                 it->openmin = 0;
 954                 changed = 1;
 955         }
 956         if (snd_interval_checkempty(it)) {
 957                 it->empty = 1;
 958                 return -EINVAL;
 959         }
 960         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 961         return changed;
 962 }
 963
 964 /*
 965  *  If the device supports unusual bit rates, does the request meet these?
 966  */
 967 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 968                                   struct snd_usb_substream *subs)
 969 {
 970         struct audioformat *fp;
 971         int *rate_list;
 972         int count = 0, needs_knot = 0;
 973         int err;
 974
 975         kfree(subs->rate_list.list);
 976         subs->rate_list.list = NULL;
 977
 978         list_for_each_entry(fp, &subs->fmt_list, list) {
 979                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 980                         return 0;
 981                 count += fp->nr_rates;
 982                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 983                         needs_knot = 1;
 984         }
 985         if (!needs_knot)
 986                 return 0;
 987
 988         subs->rate_list.list = rate_list =
 989                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 990         if (!subs->rate_list.list)
 991                 return -ENOMEM;
 992         subs->rate_list.count = count;
 993         subs->rate_list.mask = 0;
 994         count = 0;
 995         list_for_each_entry(fp, &subs->fmt_list, list) {
 996                 int i;
 997                 for (i = 0; i < fp->nr_rates; i++)
 998                         rate_list[count++] = fp->rate_table[i];
 999         }
1000         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1001                                          &subs->rate_list);
1002         if (err < 0)
1003                 return err;
1004
1005         return 0;
1006 }
1007
1008
1009 /*
1010  * set up the runtime hardware information.
1011  */
1012
1013 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1014 {
1015         struct list_head *p;
1016         unsigned int pt, ptmin;
1017         int param_period_time_if_needed;
1018         int err;
1019
1020         runtime->hw.formats = subs->formats;
1021
1022         runtime->hw.rate_min = 0x7fffffff;
1023         runtime->hw.rate_max = 0;
1024         runtime->hw.channels_min = 256;
1025         runtime->hw.channels_max = 0;
1026         runtime->hw.rates = 0;
1027         ptmin = UINT_MAX;
1028         /* check min/max rates and channels */
1029         list_for_each(p, &subs->fmt_list) {
1030                 struct audioformat *fp;
1031                 fp = list_entry(p, struct audioformat, list);
1032                 runtime->hw.rates |= fp->rates;
1033                 if (runtime->hw.rate_min > fp->rate_min)
1034                         runtime->hw.rate_min = fp->rate_min;
1035                 if (runtime->hw.rate_max < fp->rate_max)
1036                         runtime->hw.rate_max = fp->rate_max;
1037                 if (runtime->hw.channels_min > fp->channels)
1038                         runtime->hw.channels_min = fp->channels;
1039                 if (runtime->hw.channels_max < fp->channels)
1040                         runtime->hw.channels_max = fp->channels;
1041                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1042                         /* FIXME: there might be more than one audio formats... */
1043                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1044                                 fp->frame_size;
1045                 }
1046                 pt = 125 * (1 << fp->datainterval);
1047                 ptmin = min(ptmin, pt);
1048         }
1049         err = snd_usb_autoresume(subs->stream->chip);
1050         if (err < 0)
1051                 return err;
1052
1053         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1054         if (subs->speed == USB_SPEED_FULL)
1055                 /* full speed devices have fixed data packet interval */
1056                 ptmin = 1000;
1057         if (ptmin == 1000)
1058                 /* if period time doesn't go below 1 ms, no rules needed */
1059                 param_period_time_if_needed = -1;
1060         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1061                                      ptmin, UINT_MAX);
1062
1063         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1064                                        hw_rule_rate, subs,
1065                                        SNDRV_PCM_HW_PARAM_FORMAT,
1066                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1067                                        param_period_time_if_needed,
1068                                        -1)) < 0)
1069                 goto rep_err;
1070         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1071                                        hw_rule_channels, subs,
1072                                        SNDRV_PCM_HW_PARAM_FORMAT,
1073                                        SNDRV_PCM_HW_PARAM_RATE,
1074                                        param_period_time_if_needed,
1075                                        -1)) < 0)
1076                 goto rep_err;
1077         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1078                                        hw_rule_format, subs,
1079                                        SNDRV_PCM_HW_PARAM_RATE,
1080                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1081                                        param_period_time_if_needed,
1082                                        -1)) < 0)
1083                 goto rep_err;
1084         if (param_period_time_if_needed >= 0) {
1085                 err = snd_pcm_hw_rule_add(runtime, 0,
1086                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1087                                           hw_rule_period_time, subs,
1088                                           SNDRV_PCM_HW_PARAM_FORMAT,
1089                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1090                                           SNDRV_PCM_HW_PARAM_RATE,
1091                                           -1);
1092                 if (err < 0)
1093                         goto rep_err;
1094         }
1095         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1096                 goto rep_err;
1097         return 0;
1098
1099 rep_err:
1100         snd_usb_autosuspend(subs->stream->chip);
1101         return err;
1102 }
1103
1104 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1105 {
1106         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1107         struct snd_pcm_runtime *runtime = substream->runtime;
1108         struct snd_usb_substream *subs = &as->substream[direction];
1109
1110         subs->interface = -1;
1111         subs->altset_idx = 0;
1112         runtime->hw = snd_usb_hardware;
1113         runtime->private_data = subs;
1114         subs->pcm_substream = substream;
1115         /* runtime PM is also done there */
1116         return setup_hw_info(runtime, subs);
1117 }
1118
1119 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1120 {
1121         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1122         struct snd_usb_substream *subs = &as->substream[direction];
1123
1124         stop_endpoints(subs, true);
1125
1126         if (!as->chip->shutdown && subs->interface >= 0) {
1127                 usb_set_interface(subs->dev, subs->interface, 0);
1128                 subs->interface = -1;
1129         }
1130
1131         subs->pcm_substream = NULL;
1132         snd_usb_autosuspend(subs->stream->chip);
1133
1134         return 0;
1135 }
1136
1137 /* Since a URB can handle only a single linear buffer, we must use double
1138  * buffering when the data to be transferred overflows the buffer boundary.
1139  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1140  * for all URBs.
1141  */
1142 static void retire_capture_urb(struct snd_usb_substream *subs,
1143                                struct urb *urb)
1144 {
1145         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1146         unsigned int stride, frames, bytes, oldptr;
1147         int i, period_elapsed = 0;
1148         unsigned long flags;
1149         unsigned char *cp;
1150
1151         stride = runtime->frame_bits >> 3;
1152
1153         for (i = 0; i < urb->number_of_packets; i++) {
1154                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1155                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1156                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1157                         // continue;
1158                 }
1159                 bytes = urb->iso_frame_desc[i].actual_length;
1160                 frames = bytes / stride;
1161                 if (!subs->txfr_quirk)
1162                         bytes = frames * stride;
1163                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1164 #ifdef CONFIG_SND_DEBUG_VERBOSE
1165                         int oldbytes = bytes;
1166 #endif
1167                         bytes = frames * stride;
1168                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1169                                                         oldbytes, bytes);
1170                 }
1171                 /* update the current pointer */
1172                 spin_lock_irqsave(&subs->lock, flags);
1173                 oldptr = subs->hwptr_done;
1174                 subs->hwptr_done += bytes;
1175                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1176                         subs->hwptr_done -= runtime->buffer_size * stride;
1177                 frames = (bytes + (oldptr % stride)) / stride;
1178                 subs->transfer_done += frames;
1179                 if (subs->transfer_done >= runtime->period_size) {
1180                         subs->transfer_done -= runtime->period_size;
1181                         period_elapsed = 1;
1182                 }
1183                 spin_unlock_irqrestore(&subs->lock, flags);
1184                 /* copy a data chunk */
1185                 if (oldptr + bytes > runtime->buffer_size * stride) {
1186                         unsigned int bytes1 =
1187                                         runtime->buffer_size * stride - oldptr;
1188                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1189                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1190                 } else {
1191                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1192                 }
1193         }
1194
1195         if (period_elapsed)
1196                 snd_pcm_period_elapsed(subs->pcm_substream);
1197 }
1198
1199 static void prepare_playback_urb(struct snd_usb_substream *subs,
1200                                  struct urb *urb)
1201 {
1202         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1203         struct snd_usb_endpoint *ep = subs->data_endpoint;
1204         struct snd_urb_ctx *ctx = urb->context;
1205         unsigned int counts, frames, bytes;
1206         int i, stride, period_elapsed = 0;
1207         unsigned long flags;
1208
1209         stride = runtime->frame_bits >> 3;
1210
1211         frames = 0;
1212         urb->number_of_packets = 0;
1213         spin_lock_irqsave(&subs->lock, flags);
1214         for (i = 0; i < ctx->packets; i++) {
1215                 if (ctx->packet_size[i])
1216                         counts = ctx->packet_size[i];
1217                 else
1218                         counts = snd_usb_endpoint_next_packet_size(ep);
1219
1220                 /* set up descriptor */
1221                 urb->iso_frame_desc[i].offset = frames * stride;
1222                 urb->iso_frame_desc[i].length = counts * stride;
1223                 frames += counts;
1224                 urb->number_of_packets++;
1225                 subs->transfer_done += counts;
1226                 if (subs->transfer_done >= runtime->period_size) {
1227                         subs->transfer_done -= runtime->period_size;
1228                         period_elapsed = 1;
1229                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1230                                 if (subs->transfer_done > 0) {
1231                                         /* FIXME: fill-max mode is not
1232                                          * supported yet */
1233                                         frames -= subs->transfer_done;
1234                                         counts -= subs->transfer_done;
1235                                         urb->iso_frame_desc[i].length =
1236                                                 counts * stride;
1237                                         subs->transfer_done = 0;
1238                                 }
1239                                 i++;
1240                                 if (i < ctx->packets) {
1241                                         /* add a transfer delimiter */
1242                                         urb->iso_frame_desc[i].offset =
1243                                                 frames * stride;
1244                                         urb->iso_frame_desc[i].length = 0;
1245                                         urb->number_of_packets++;
1246                                 }
1247                                 break;
1248                         }
1249                 }
1250                 if (period_elapsed &&
1251                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1252                         break;
1253         }
1254         bytes = frames * stride;
1255         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1256                 /* err, the transferred area goes over buffer boundary. */
1257                 unsigned int bytes1 =
1258                         runtime->buffer_size * stride - subs->hwptr_done;
1259                 memcpy(urb->transfer_buffer,
1260                        runtime->dma_area + subs->hwptr_done, bytes1);
1261                 memcpy(urb->transfer_buffer + bytes1,
1262                        runtime->dma_area, bytes - bytes1);
1263         } else {
1264                 memcpy(urb->transfer_buffer,
1265                        runtime->dma_area + subs->hwptr_done, bytes);
1266         }
1267         subs->hwptr_done += bytes;
1268         if (subs->hwptr_done >= runtime->buffer_size * stride)
1269                 subs->hwptr_done -= runtime->buffer_size * stride;
1270
1271         /* update delay with exact number of samples queued */
1272         runtime->delay = subs->last_delay;
1273         runtime->delay += frames;
1274         subs->last_delay = runtime->delay;
1275
1276         /* realign last_frame_number */
1277         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1278         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1279
1280         spin_unlock_irqrestore(&subs->lock, flags);
1281         urb->transfer_buffer_length = bytes;
1282         if (period_elapsed)
1283                 snd_pcm_period_elapsed(subs->pcm_substream);
1284 }
1285
1286 /*
1287  * process after playback data complete
1288  * - decrease the delay count again
1289  */
1290 static void retire_playback_urb(struct snd_usb_substream *subs,
1291                                struct urb *urb)
1292 {
1293         unsigned long flags;
1294         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1295         int stride = runtime->frame_bits >> 3;
1296         int processed = urb->transfer_buffer_length / stride;
1297         int est_delay;
1298
1299         /* ignore the delay accounting when procssed=0 is given, i.e.
1300          * silent payloads are procssed before handling the actual data
1301          */
1302         if (!processed)
1303                 return;
1304
1305         spin_lock_irqsave(&subs->lock, flags);
1306         if (!subs->last_delay)
1307                 goto out; /* short path */
1308
1309         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1310         /* update delay with exact number of samples played */
1311         if (processed > subs->last_delay)
1312                 subs->last_delay = 0;
1313         else
1314                 subs->last_delay -= processed;
1315         runtime->delay = subs->last_delay;
1316
1317         /*
1318          * Report when delay estimate is off by more than 2ms.
1319          * The error should be lower than 2ms since the estimate relies
1320          * on two reads of a counter updated every ms.
1321          */
1322         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1323                 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1324                         est_delay, subs->last_delay);
1325
1326         if (!subs->running) {
1327                 /* update last_frame_number for delay counting here since
1328                  * prepare_playback_urb won't be called during pause
1329                  */
1330                 subs->last_frame_number =
1331                         usb_get_current_frame_number(subs->dev) & 0xff;
1332         }
1333
1334  out:
1335         spin_unlock_irqrestore(&subs->lock, flags);
1336 }
1337
1338 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1339 {
1340         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1341 }
1342
1343 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1344 {
1345         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1346 }
1347
1348 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1349 {
1350         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1351 }
1352
1353 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1354 {
1355         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1356 }
1357
1358 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1359                                               int cmd)
1360 {
1361         struct snd_usb_substream *subs = substream->runtime->private_data;
1362
1363         switch (cmd) {
1364         case SNDRV_PCM_TRIGGER_START:
1365         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1366                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1367                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1368                 subs->running = 1;
1369                 return 0;
1370         case SNDRV_PCM_TRIGGER_STOP:
1371                 stop_endpoints(subs, false);
1372                 subs->running = 0;
1373                 return 0;
1374         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1375                 subs->data_endpoint->prepare_data_urb = NULL;
1376                 /* keep retire_data_urb for delay calculation */
1377                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1378                 subs->running = 0;
1379                 return 0;
1380         }
1381
1382         return -EINVAL;
1383 }
1384
1385 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1386                                              int cmd)
1387 {
1388         int err;
1389         struct snd_usb_substream *subs = substream->runtime->private_data;
1390
1391         switch (cmd) {
1392         case SNDRV_PCM_TRIGGER_START:
1393                 err = start_endpoints(subs, false);
1394                 if (err < 0)
1395                         return err;
1396
1397                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1398                 subs->running = 1;
1399                 return 0;
1400         case SNDRV_PCM_TRIGGER_STOP:
1401                 stop_endpoints(subs, false);
1402                 subs->running = 0;
1403                 return 0;
1404         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1405                 subs->data_endpoint->retire_data_urb = NULL;
1406                 subs->running = 0;
1407                 return 0;
1408         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1409                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1410                 subs->running = 1;
1411                 return 0;
1412         }
1413
1414         return -EINVAL;
1415 }
1416
1417 static struct snd_pcm_ops snd_usb_playback_ops = {
1418         .open =         snd_usb_playback_open,
1419         .close =        snd_usb_playback_close,
1420         .ioctl =        snd_pcm_lib_ioctl,
1421         .hw_params =    snd_usb_hw_params,
1422         .hw_free =      snd_usb_hw_free,
1423         .prepare =      snd_usb_pcm_prepare,
1424         .trigger =      snd_usb_substream_playback_trigger,
1425         .pointer =      snd_usb_pcm_pointer,
1426         .page =         snd_pcm_lib_get_vmalloc_page,
1427         .mmap =         snd_pcm_lib_mmap_vmalloc,
1428 };
1429
1430 static struct snd_pcm_ops snd_usb_capture_ops = {
1431         .open =         snd_usb_capture_open,
1432         .close =        snd_usb_capture_close,
1433         .ioctl =        snd_pcm_lib_ioctl,
1434         .hw_params =    snd_usb_hw_params,
1435         .hw_free =      snd_usb_hw_free,
1436         .prepare =      snd_usb_pcm_prepare,
1437         .trigger =      snd_usb_substream_capture_trigger,
1438         .pointer =      snd_usb_pcm_pointer,
1439         .page =         snd_pcm_lib_get_vmalloc_page,
1440         .mmap =         snd_pcm_lib_mmap_vmalloc,
1441 };
1442
1443 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1444 {
1445         snd_pcm_set_ops(pcm, stream,
1446                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1447                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1448 }