sound/usb/pcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/ratelimit.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/audio.h>
  22 #include <linux/usb/audio-v2.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27
  28 #include "usbaudio.h"
  29 #include "card.h"
  30 #include "quirks.h"
  31 #include "debug.h"
  32 #include "endpoint.h"
  33 #include "helper.h"
  34 #include "pcm.h"
  35 #include "clock.h"
  36 #include "power.h"
  37
  38 #define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  39 #define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  40
  41 /* return the estimated delay based on USB frame counters */
  42 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  43                                     unsigned int rate)
  44 {
  45         int current_frame_number;
  46         int frame_diff;
  47         int est_delay;
  48
  49         current_frame_number = usb_get_current_frame_number(subs->dev);
  50         /*
  51          * HCD implementations use different widths, use lower 8 bits.
  52          * The delay will be managed up to 256ms, which is more than
  53          * enough
  54          */
  55         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  56
  57         /* Approximation based on number of samples per USB frame (ms),
  58            some truncation for 44.1 but the estimate is good enough */
  59         est_delay =  subs->last_delay - (frame_diff * rate / 1000);
  60         if (est_delay < 0)
  61                 est_delay = 0;
  62         return est_delay;
  63 }
  64
  65 /*
  66  * return the current pcm pointer.  just based on the hwptr_done value.
  67  */
  68 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  69 {
  70         struct snd_usb_substream *subs;
  71         unsigned int hwptr_done;
  72
  73         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  74         if (subs->stream->chip->shutdown)
  75                 return SNDRV_PCM_POS_XRUN;
  76         spin_lock(&subs->lock);
  77         hwptr_done = subs->hwptr_done;
  78         substream->runtime->delay = snd_usb_pcm_delay(subs,
  79                                                 substream->runtime->rate);
  80         spin_unlock(&subs->lock);
  81         return hwptr_done / (substream->runtime->frame_bits >> 3);
  82 }
  83
  84 /*
  85  * find a matching audio format
  86  */
  87 static struct audioformat *find_format(struct snd_usb_substream *subs)
  88 {
  89         struct list_head *p;
  90         struct audioformat *found = NULL;
  91         int cur_attr = 0, attr;
  92
  93         list_for_each(p, &subs->fmt_list) {
  94                 struct audioformat *fp;
  95                 fp = list_entry(p, struct audioformat, list);
  96                 if (!(fp->formats & (1uLL << subs->pcm_format)))
  97                         continue;
  98                 if (fp->channels != subs->channels)
  99                         continue;
 100                 if (subs->cur_rate < fp->rate_min ||
 101                     subs->cur_rate > fp->rate_max)
 102                         continue;
 103                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 104                         unsigned int i;
 105                         for (i = 0; i < fp->nr_rates; i++)
 106                                 if (fp->rate_table[i] == subs->cur_rate)
 107                                         break;
 108                         if (i >= fp->nr_rates)
 109                                 continue;
 110                 }
 111                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 112                 if (! found) {
 113                         found = fp;
 114                         cur_attr = attr;
 115                         continue;
 116                 }
 117                 /* avoid async out and adaptive in if the other method
 118                  * supports the same format.
 119                  * this is a workaround for the case like
 120                  * M-audio audiophile USB.
 121                  */
 122                 if (attr != cur_attr) {
 123                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 127                                 continue;
 128                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 129                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 130                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 131                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 132                                 found = fp;
 133                                 cur_attr = attr;
 134                                 continue;
 135                         }
 136                 }
 137                 /* find the format with the largest max. packet size */
 138                 if (fp->maxpacksize > found->maxpacksize) {
 139                         found = fp;
 140                         cur_attr = attr;
 141                 }
 142         }
 143         return found;
 144 }
 145
 146 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 147                          struct usb_host_interface *alts,
 148                          struct audioformat *fmt)
 149 {
 150         struct usb_device *dev = chip->dev;
 151         unsigned int ep;
 152         unsigned char data[1];
 153         int err;
 154
 155         ep = get_endpoint(alts, 0)->bEndpointAddress;
 156
 157         data[0] = 1;
 158         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 159                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 160                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 161                                    data, sizeof(data))) < 0) {
 162                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 163                            dev->devnum, iface, ep);
 164                 return err;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 171                          struct usb_host_interface *alts,
 172                          struct audioformat *fmt)
 173 {
 174         struct usb_device *dev = chip->dev;
 175         unsigned char data[1];
 176         unsigned int ep;
 177         int err;
 178
 179         ep = get_endpoint(alts, 0)->bEndpointAddress;
 180
 181         data[0] = 1;
 182         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 183                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 184                                    UAC2_EP_CS_PITCH << 8, 0,
 185                                    data, sizeof(data))) < 0) {
 186                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 187                            dev->devnum, iface, fmt->altsetting);
 188                 return err;
 189         }
 190
 191         return 0;
 192 }
 193
 194 /*
 195  * initialize the pitch control and sample rate
 196  */
 197 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 198                        struct usb_host_interface *alts,
 199                        struct audioformat *fmt)
 200 {
 201         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 202
 203         /* if endpoint doesn't have pitch control, bail out */
 204         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 205                 return 0;
 206
 207         switch (altsd->bInterfaceProtocol) {
 208         case UAC_VERSION_1:
 209         default:
 210                 return init_pitch_v1(chip, iface, alts, fmt);
 211
 212         case UAC_VERSION_2:
 213                 return init_pitch_v2(chip, iface, alts, fmt);
 214         }
 215 }
 216
 217 static int start_endpoints(struct snd_usb_substream *subs, int can_sleep)
 218 {
 219         int err;
 220
 221         if (!subs->data_endpoint)
 222                 return -EINVAL;
 223
 224         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 225                 struct snd_usb_endpoint *ep = subs->data_endpoint;
 226
 227                 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
 228
 229                 ep->data_subs = subs;
 230                 err = snd_usb_endpoint_start(ep, can_sleep);
 231                 if (err < 0) {
 232                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 233                         return err;
 234                 }
 235         }
 236
 237         if (subs->sync_endpoint &&
 238             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 239                 struct snd_usb_endpoint *ep = subs->sync_endpoint;
 240
 241                 if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 242                     subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
 243                         err = usb_set_interface(subs->dev,
 244                                                 subs->sync_endpoint->iface,
 245                                                 subs->sync_endpoint->alt_idx);
 246                         if (err < 0) {
 247                                 snd_printk(KERN_ERR
 248                                            "%d:%d:%d: cannot set interface (%d)\n",
 249                                            subs->dev->devnum,
 250                                            subs->sync_endpoint->iface,
 251                                            subs->sync_endpoint->alt_idx, err);
 252                                 return -EIO;
 253                         }
 254                 }
 255
 256                 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
 257
 258                 ep->sync_slave = subs->data_endpoint;
 259                 err = snd_usb_endpoint_start(ep, can_sleep);
 260                 if (err < 0) {
 261                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 262                         return err;
 263                 }
 264         }
 265
 266         return 0;
 267 }
 268
 269 static void stop_endpoints(struct snd_usb_substream *subs,
 270                            int force, int can_sleep, int wait)
 271 {
 272         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 273                 snd_usb_endpoint_stop(subs->sync_endpoint,
 274                                       force, can_sleep, wait);
 275
 276         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 277                 snd_usb_endpoint_stop(subs->data_endpoint,
 278                                       force, can_sleep, wait);
 279 }
 280
 281 static int deactivate_endpoints(struct snd_usb_substream *subs)
 282 {
 283         int reta, retb;
 284
 285         reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
 286         retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
 287
 288         if (reta < 0)
 289                 return reta;
 290
 291         if (retb < 0)
 292                 return retb;
 293
 294         return 0;
 295 }
 296
 297 /*
 298  * find a matching format and set up the interface
 299  */
 300 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 301 {
 302         struct usb_device *dev = subs->dev;
 303         struct usb_host_interface *alts;
 304         struct usb_interface_descriptor *altsd;
 305         struct usb_interface *iface;
 306         unsigned int ep, attr;
 307         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 308         int err, implicit_fb = 0;
 309
 310         iface = usb_ifnum_to_if(dev, fmt->iface);
 311         if (WARN_ON(!iface))
 312                 return -EINVAL;
 313         alts = &iface->altsetting[fmt->altset_idx];
 314         altsd = get_iface_desc(alts);
 315         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 316                 return -EINVAL;
 317
 318         if (fmt == subs->cur_audiofmt)
 319                 return 0;
 320
 321         /* close the old interface */
 322         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 323                 err = usb_set_interface(subs->dev, subs->interface, 0);
 324                 if (err < 0) {
 325                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
 326                                 dev->devnum, fmt->iface, fmt->altsetting, err);
 327                         return -EIO;
 328                 }
 329                 subs->interface = -1;
 330                 subs->altset_idx = 0;
 331         }
 332
 333         /* set interface */
 334         if (subs->interface != fmt->iface ||
 335             subs->altset_idx != fmt->altset_idx) {
 336                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 337                 if (err < 0) {
 338                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
 339                                    dev->devnum, fmt->iface, fmt->altsetting, err);
 340                         return -EIO;
 341                 }
 342                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
 343                                 fmt->iface, fmt->altsetting);
 344                 subs->interface = fmt->iface;
 345                 subs->altset_idx = fmt->altset_idx;
 346         }
 347
 348         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 349                                                    alts, fmt->endpoint, subs->direction,
 350                                                    SND_USB_ENDPOINT_TYPE_DATA);
 351         if (!subs->data_endpoint)
 352                 return -EINVAL;
 353
 354         /* we need a sync pipe in async OUT or adaptive IN mode */
 355         /* check the number of EP, since some devices have broken
 356          * descriptors which fool us.  if it has only one EP,
 357          * assume it as adaptive-out or sync-in.
 358          */
 359         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 360
 361         switch (subs->stream->chip->usb_id) {
 362         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 363         case USB_ID(0x0763, 0x2081):
 364                 if (is_playback) {
 365                         implicit_fb = 1;
 366                         ep = 0x81;
 367                         iface = usb_ifnum_to_if(dev, 2);
 368
 369                         if (!iface || iface->num_altsetting == 0)
 370                                 return -EINVAL;
 371
 372                         alts = &iface->altsetting[1];
 373                         goto add_sync_ep;
 374                 }
 375         }
 376
 377         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 378              (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 379             altsd->bNumEndpoints >= 2) {
 380                 /* check sync-pipe endpoint */
 381                 /* ... and check descriptor size before accessing bSynchAddress
 382                    because there is a version of the SB Audigy 2 NX firmware lacking
 383                    the audio fields in the endpoint descriptors */
 384                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 385                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 386                      get_endpoint(alts, 1)->bSynchAddress != 0 &&
 387                      !implicit_fb)) {
 388                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 389                                    dev->devnum, fmt->iface, fmt->altsetting,
 390                                    get_endpoint(alts, 1)->bmAttributes,
 391                                    get_endpoint(alts, 1)->bLength,
 392                                    get_endpoint(alts, 1)->bSynchAddress);
 393                         return -EINVAL;
 394                 }
 395                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 396                 if (!implicit_fb &&
 397                     get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 398                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 399                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 400                         snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 401                                    dev->devnum, fmt->iface, fmt->altsetting,
 402                                    is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 403                         return -EINVAL;
 404                 }
 405
 406                 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 407                                 == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 408
 409 add_sync_ep:
 410                 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 411                                                            alts, ep, !subs->direction,
 412                                                            implicit_fb ?
 413                                                                 SND_USB_ENDPOINT_TYPE_DATA :
 414                                                                 SND_USB_ENDPOINT_TYPE_SYNC);
 415                 if (!subs->sync_endpoint)
 416                         return -EINVAL;
 417
 418                 subs->data_endpoint->sync_master = subs->sync_endpoint;
 419         }
 420
 421         if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
 422                 return err;
 423
 424         subs->cur_audiofmt = fmt;
 425
 426         snd_usb_set_format_quirk(subs, fmt);
 427
 428 #if 0
 429         printk(KERN_DEBUG
 430                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 431                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 432         printk(KERN_DEBUG
 433                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 434                subs->datapipe, subs->syncpipe);
 435 #endif
 436
 437         return 0;
 438 }
 439
 440 /*
 441  * configure endpoint params
 442  *
 443  * called  during initial setup and upon resume
 444  */
 445 static int configure_endpoint(struct snd_usb_substream *subs)
 446 {
 447         int ret;
 448
 449         /* format changed */
 450         stop_endpoints(subs, 0, 0, 0);
 451         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 452                                           subs->pcm_format,
 453                                           subs->channels,
 454                                           subs->period_bytes,
 455                                           subs->cur_rate,
 456                                           subs->cur_audiofmt,
 457                                           subs->sync_endpoint);
 458         if (ret < 0)
 459                 return ret;
 460
 461         if (subs->sync_endpoint)
 462                 ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 463                                                   subs->pcm_format,
 464                                                   subs->channels,
 465                                                   subs->period_bytes,
 466                                                   subs->cur_rate,
 467                                                   subs->cur_audiofmt,
 468                                                   NULL);
 469         return ret;
 470 }
 471
 472 /*
 473  * hw_params callback
 474  *
 475  * allocate a buffer and set the given audio format.
 476  *
 477  * so far we use a physically linear buffer although packetize transfer
 478  * doesn't need a continuous area.
 479  * if sg buffer is supported on the later version of alsa, we'll follow
 480  * that.
 481  */
 482 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 483                              struct snd_pcm_hw_params *hw_params)
 484 {
 485         struct snd_usb_substream *subs = substream->runtime->private_data;
 486         struct audioformat *fmt;
 487         int ret;
 488
 489         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 490                                                params_buffer_bytes(hw_params));
 491         if (ret < 0)
 492                 return ret;
 493
 494         subs->pcm_format = params_format(hw_params);
 495         subs->period_bytes = params_period_bytes(hw_params);
 496         subs->channels = params_channels(hw_params);
 497         subs->cur_rate = params_rate(hw_params);
 498
 499         fmt = find_format(subs);
 500         if (!fmt) {
 501                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 502                            subs->pcm_format, subs->cur_rate, subs->channels);
 503                 return -EINVAL;
 504         }
 505
 506         down_read(&subs->stream->chip->shutdown_rwsem);
 507         if (subs->stream->chip->shutdown)
 508                 ret = -ENODEV;
 509         else
 510                 ret = set_format(subs, fmt);
 511         up_read(&subs->stream->chip->shutdown_rwsem);
 512         if (ret < 0)
 513                 return ret;
 514
 515         subs->interface = fmt->iface;
 516         subs->altset_idx = fmt->altset_idx;
 517         subs->need_setup_ep = true;
 518
 519         return 0;
 520 }
 521
 522 /*
 523  * hw_free callback
 524  *
 525  * reset the audio format and release the buffer
 526  */
 527 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 528 {
 529         struct snd_usb_substream *subs = substream->runtime->private_data;
 530
 531         subs->cur_audiofmt = NULL;
 532         subs->cur_rate = 0;
 533         subs->period_bytes = 0;
 534         down_read(&subs->stream->chip->shutdown_rwsem);
 535         if (!subs->stream->chip->shutdown) {
 536                 stop_endpoints(subs, 0, 1, 1);
 537                 deactivate_endpoints(subs);
 538         }
 539         up_read(&subs->stream->chip->shutdown_rwsem);
 540         return snd_pcm_lib_free_vmalloc_buffer(substream);
 541 }
 542
 543 /*
 544  * prepare callback
 545  *
 546  * only a few subtle things...
 547  */
 548 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 549 {
 550         struct snd_pcm_runtime *runtime = substream->runtime;
 551         struct snd_usb_substream *subs = runtime->private_data;
 552         struct usb_host_interface *alts;
 553         struct usb_interface *iface;
 554         int ret;
 555
 556         if (! subs->cur_audiofmt) {
 557                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 558                 return -ENXIO;
 559         }
 560
 561         down_read(&subs->stream->chip->shutdown_rwsem);
 562         if (subs->stream->chip->shutdown) {
 563                 ret = -ENODEV;
 564                 goto unlock;
 565         }
 566         if (snd_BUG_ON(!subs->data_endpoint)) {
 567                 ret = -EIO;
 568                 goto unlock;
 569         }
 570
 571         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 572         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 573
 574         ret = set_format(subs, subs->cur_audiofmt);
 575         if (ret < 0)
 576                 goto unlock;
 577
 578         iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 579         alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 580         ret = snd_usb_init_sample_rate(subs->stream->chip,
 581                                        subs->cur_audiofmt->iface,
 582                                        alts,
 583                                        subs->cur_audiofmt,
 584                                        subs->cur_rate);
 585         if (ret < 0)
 586                 goto unlock;
 587
 588         if (subs->need_setup_ep) {
 589                 ret = configure_endpoint(subs);
 590                 if (ret < 0)
 591                         goto unlock;
 592                 subs->need_setup_ep = false;
 593         }
 594
 595         /* some unit conversions in runtime */
 596         subs->data_endpoint->maxframesize =
 597                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 598         subs->data_endpoint->curframesize =
 599                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 600
 601         /* reset the pointer */
 602         subs->hwptr_done = 0;
 603         subs->transfer_done = 0;
 604         subs->last_delay = 0;
 605         subs->last_frame_number = 0;
 606         runtime->delay = 0;
 607
 608         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 609          * updates for all URBs would happen at the same time when starting */
 610         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 611                 ret = start_endpoints(subs, 1);
 612
 613  unlock:
 614         up_read(&subs->stream->chip->shutdown_rwsem);
 615         return ret;
 616 }
 617
 618 static struct snd_pcm_hardware snd_usb_hardware =
 619 {
 620         .info =                 SNDRV_PCM_INFO_MMAP |
 621                                 SNDRV_PCM_INFO_MMAP_VALID |
 622                                 SNDRV_PCM_INFO_BATCH |
 623                                 SNDRV_PCM_INFO_INTERLEAVED |
 624                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 625                                 SNDRV_PCM_INFO_PAUSE,
 626         .buffer_bytes_max =     1024 * 1024,
 627         .period_bytes_min =     64,
 628         .period_bytes_max =     512 * 1024,
 629         .periods_min =          2,
 630         .periods_max =          1024,
 631 };
 632
 633 static int hw_check_valid_format(struct snd_usb_substream *subs,
 634                                  struct snd_pcm_hw_params *params,
 635                                  struct audioformat *fp)
 636 {
 637         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 638         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 639         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 640         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 641         struct snd_mask check_fmts;
 642         unsigned int ptime;
 643
 644         /* check the format */
 645         snd_mask_none(&check_fmts);
 646         check_fmts.bits[0] = (u32)fp->formats;
 647         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 648         snd_mask_intersect(&check_fmts, fmts);
 649         if (snd_mask_empty(&check_fmts)) {
 650                 hwc_debug("   > check: no supported format %d\n", fp->format);
 651                 return 0;
 652         }
 653         /* check the channels */
 654         if (fp->channels < ct->min || fp->channels > ct->max) {
 655                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 656                 return 0;
 657         }
 658         /* check the rate is within the range */
 659         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 660                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 661                 return 0;
 662         }
 663         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 664                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 665                 return 0;
 666         }
 667         /* check whether the period time is >= the data packet interval */
 668         if (subs->speed != USB_SPEED_FULL) {
 669                 ptime = 125 * (1 << fp->datainterval);
 670                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 671                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 672                         return 0;
 673                 }
 674         }
 675         return 1;
 676 }
 677
 678 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 679                         struct snd_pcm_hw_rule *rule)
 680 {
 681         struct snd_usb_substream *subs = rule->private;
 682         struct list_head *p;
 683         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 684         unsigned int rmin, rmax;
 685         int changed;
 686
 687         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 688         changed = 0;
 689         rmin = rmax = 0;
 690         list_for_each(p, &subs->fmt_list) {
 691                 struct audioformat *fp;
 692                 fp = list_entry(p, struct audioformat, list);
 693                 if (!hw_check_valid_format(subs, params, fp))
 694                         continue;
 695                 if (changed++) {
 696                         if (rmin > fp->rate_min)
 697                                 rmin = fp->rate_min;
 698                         if (rmax < fp->rate_max)
 699                                 rmax = fp->rate_max;
 700                 } else {
 701                         rmin = fp->rate_min;
 702                         rmax = fp->rate_max;
 703                 }
 704         }
 705
 706         if (!changed) {
 707                 hwc_debug("  --> get empty\n");
 708                 it->empty = 1;
 709                 return -EINVAL;
 710         }
 711
 712         changed = 0;
 713         if (it->min < rmin) {
 714                 it->min = rmin;
 715                 it->openmin = 0;
 716                 changed = 1;
 717         }
 718         if (it->max > rmax) {
 719                 it->max = rmax;
 720                 it->openmax = 0;
 721                 changed = 1;
 722         }
 723         if (snd_interval_checkempty(it)) {
 724                 it->empty = 1;
 725                 return -EINVAL;
 726         }
 727         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 728         return changed;
 729 }
 730
 731
 732 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 733                             struct snd_pcm_hw_rule *rule)
 734 {
 735         struct snd_usb_substream *subs = rule->private;
 736         struct list_head *p;
 737         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 738         unsigned int rmin, rmax;
 739         int changed;
 740
 741         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 742         changed = 0;
 743         rmin = rmax = 0;
 744         list_for_each(p, &subs->fmt_list) {
 745                 struct audioformat *fp;
 746                 fp = list_entry(p, struct audioformat, list);
 747                 if (!hw_check_valid_format(subs, params, fp))
 748                         continue;
 749                 if (changed++) {
 750                         if (rmin > fp->channels)
 751                                 rmin = fp->channels;
 752                         if (rmax < fp->channels)
 753                                 rmax = fp->channels;
 754                 } else {
 755                         rmin = fp->channels;
 756                         rmax = fp->channels;
 757                 }
 758         }
 759
 760         if (!changed) {
 761                 hwc_debug("  --> get empty\n");
 762                 it->empty = 1;
 763                 return -EINVAL;
 764         }
 765
 766         changed = 0;
 767         if (it->min < rmin) {
 768                 it->min = rmin;
 769                 it->openmin = 0;
 770                 changed = 1;
 771         }
 772         if (it->max > rmax) {
 773                 it->max = rmax;
 774                 it->openmax = 0;
 775                 changed = 1;
 776         }
 777         if (snd_interval_checkempty(it)) {
 778                 it->empty = 1;
 779                 return -EINVAL;
 780         }
 781         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 782         return changed;
 783 }
 784
 785 static int hw_rule_format(struct snd_pcm_hw_params *params,
 786                           struct snd_pcm_hw_rule *rule)
 787 {
 788         struct snd_usb_substream *subs = rule->private;
 789         struct list_head *p;
 790         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 791         u64 fbits;
 792         u32 oldbits[2];
 793         int changed;
 794
 795         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 796         fbits = 0;
 797         list_for_each(p, &subs->fmt_list) {
 798                 struct audioformat *fp;
 799                 fp = list_entry(p, struct audioformat, list);
 800                 if (!hw_check_valid_format(subs, params, fp))
 801                         continue;
 802                 fbits |= fp->formats;
 803         }
 804
 805         oldbits[0] = fmt->bits[0];
 806         oldbits[1] = fmt->bits[1];
 807         fmt->bits[0] &= (u32)fbits;
 808         fmt->bits[1] &= (u32)(fbits >> 32);
 809         if (!fmt->bits[0] && !fmt->bits[1]) {
 810                 hwc_debug("  --> get empty\n");
 811                 return -EINVAL;
 812         }
 813         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 814         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 815         return changed;
 816 }
 817
 818 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 819                                struct snd_pcm_hw_rule *rule)
 820 {
 821         struct snd_usb_substream *subs = rule->private;
 822         struct audioformat *fp;
 823         struct snd_interval *it;
 824         unsigned char min_datainterval;
 825         unsigned int pmin;
 826         int changed;
 827
 828         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 829         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 830         min_datainterval = 0xff;
 831         list_for_each_entry(fp, &subs->fmt_list, list) {
 832                 if (!hw_check_valid_format(subs, params, fp))
 833                         continue;
 834                 min_datainterval = min(min_datainterval, fp->datainterval);
 835         }
 836         if (min_datainterval == 0xff) {
 837                 hwc_debug("  --> get empty\n");
 838                 it->empty = 1;
 839                 return -EINVAL;
 840         }
 841         pmin = 125 * (1 << min_datainterval);
 842         changed = 0;
 843         if (it->min < pmin) {
 844                 it->min = pmin;
 845                 it->openmin = 0;
 846                 changed = 1;
 847         }
 848         if (snd_interval_checkempty(it)) {
 849                 it->empty = 1;
 850                 return -EINVAL;
 851         }
 852         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 853         return changed;
 854 }
 855
 856 /*
 857  *  If the device supports unusual bit rates, does the request meet these?
 858  */
 859 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 860                                   struct snd_usb_substream *subs)
 861 {
 862         struct audioformat *fp;
 863         int *rate_list;
 864         int count = 0, needs_knot = 0;
 865         int err;
 866
 867         kfree(subs->rate_list.list);
 868         subs->rate_list.list = NULL;
 869
 870         list_for_each_entry(fp, &subs->fmt_list, list) {
 871                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 872                         return 0;
 873                 count += fp->nr_rates;
 874                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 875                         needs_knot = 1;
 876         }
 877         if (!needs_knot)
 878                 return 0;
 879
 880         subs->rate_list.list = rate_list =
 881                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 882         if (!subs->rate_list.list)
 883                 return -ENOMEM;
 884         subs->rate_list.count = count;
 885         subs->rate_list.mask = 0;
 886         count = 0;
 887         list_for_each_entry(fp, &subs->fmt_list, list) {
 888                 int i;
 889                 for (i = 0; i < fp->nr_rates; i++)
 890                         rate_list[count++] = fp->rate_table[i];
 891         }
 892         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 893                                          &subs->rate_list);
 894         if (err < 0)
 895                 return err;
 896
 897         return 0;
 898 }
 899
 900
 901 /*
 902  * set up the runtime hardware information.
 903  */
 904
 905 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 906 {
 907         struct list_head *p;
 908         unsigned int pt, ptmin;
 909         int param_period_time_if_needed;
 910         int err;
 911
 912         runtime->hw.formats = subs->formats;
 913
 914         runtime->hw.rate_min = 0x7fffffff;
 915         runtime->hw.rate_max = 0;
 916         runtime->hw.channels_min = 256;
 917         runtime->hw.channels_max = 0;
 918         runtime->hw.rates = 0;
 919         ptmin = UINT_MAX;
 920         /* check min/max rates and channels */
 921         list_for_each(p, &subs->fmt_list) {
 922                 struct audioformat *fp;
 923                 fp = list_entry(p, struct audioformat, list);
 924                 runtime->hw.rates |= fp->rates;
 925                 if (runtime->hw.rate_min > fp->rate_min)
 926                         runtime->hw.rate_min = fp->rate_min;
 927                 if (runtime->hw.rate_max < fp->rate_max)
 928                         runtime->hw.rate_max = fp->rate_max;
 929                 if (runtime->hw.channels_min > fp->channels)
 930                         runtime->hw.channels_min = fp->channels;
 931                 if (runtime->hw.channels_max < fp->channels)
 932                         runtime->hw.channels_max = fp->channels;
 933                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 934                         /* FIXME: there might be more than one audio formats... */
 935                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 936                                 fp->frame_size;
 937                 }
 938                 pt = 125 * (1 << fp->datainterval);
 939                 ptmin = min(ptmin, pt);
 940         }
 941         err = snd_usb_autoresume(subs->stream->chip);
 942         if (err < 0)
 943                 return err;
 944
 945         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 946         if (subs->speed == USB_SPEED_FULL)
 947                 /* full speed devices have fixed data packet interval */
 948                 ptmin = 1000;
 949         if (ptmin == 1000)
 950                 /* if period time doesn't go below 1 ms, no rules needed */
 951                 param_period_time_if_needed = -1;
 952         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 953                                      ptmin, UINT_MAX);
 954
 955         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 956                                        hw_rule_rate, subs,
 957                                        SNDRV_PCM_HW_PARAM_FORMAT,
 958                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 959                                        param_period_time_if_needed,
 960                                        -1)) < 0)
 961                 goto rep_err;
 962         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 963                                        hw_rule_channels, subs,
 964                                        SNDRV_PCM_HW_PARAM_FORMAT,
 965                                        SNDRV_PCM_HW_PARAM_RATE,
 966                                        param_period_time_if_needed,
 967                                        -1)) < 0)
 968                 goto rep_err;
 969         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 970                                        hw_rule_format, subs,
 971                                        SNDRV_PCM_HW_PARAM_RATE,
 972                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 973                                        param_period_time_if_needed,
 974                                        -1)) < 0)
 975                 goto rep_err;
 976         if (param_period_time_if_needed >= 0) {
 977                 err = snd_pcm_hw_rule_add(runtime, 0,
 978                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 979                                           hw_rule_period_time, subs,
 980                                           SNDRV_PCM_HW_PARAM_FORMAT,
 981                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 982                                           SNDRV_PCM_HW_PARAM_RATE,
 983                                           -1);
 984                 if (err < 0)
 985                         goto rep_err;
 986         }
 987         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 988                 goto rep_err;
 989         return 0;
 990
 991 rep_err:
 992         snd_usb_autosuspend(subs->stream->chip);
 993         return err;
 994 }
 995
 996 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 997 {
 998         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 999         struct snd_pcm_runtime *runtime = substream->runtime;
1000         struct snd_usb_substream *subs = &as->substream[direction];
1001
1002         subs->interface = -1;
1003         subs->altset_idx = 0;
1004         runtime->hw = snd_usb_hardware;
1005         runtime->private_data = subs;
1006         subs->pcm_substream = substream;
1007         /* runtime PM is also done there */
1008         return setup_hw_info(runtime, subs);
1009 }
1010
1011 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1012 {
1013         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1014         struct snd_usb_substream *subs = &as->substream[direction];
1015
1016         stop_endpoints(subs, 0, 0, 0);
1017
1018         if (!as->chip->shutdown && subs->interface >= 0) {
1019                 usb_set_interface(subs->dev, subs->interface, 0);
1020                 subs->interface = -1;
1021         }
1022
1023         subs->pcm_substream = NULL;
1024         snd_usb_autosuspend(subs->stream->chip);
1025
1026         return 0;
1027 }
1028
1029 /* Since a URB can handle only a single linear buffer, we must use double
1030  * buffering when the data to be transferred overflows the buffer boundary.
1031  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1032  * for all URBs.
1033  */
1034 static void retire_capture_urb(struct snd_usb_substream *subs,
1035                                struct urb *urb)
1036 {
1037         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1038         unsigned int stride, frames, bytes, oldptr;
1039         int i, period_elapsed = 0;
1040         unsigned long flags;
1041         unsigned char *cp;
1042
1043         stride = runtime->frame_bits >> 3;
1044
1045         for (i = 0; i < urb->number_of_packets; i++) {
1046                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
1047                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1048                         snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
1049                         // continue;
1050                 }
1051                 bytes = urb->iso_frame_desc[i].actual_length;
1052                 frames = bytes / stride;
1053                 if (!subs->txfr_quirk)
1054                         bytes = frames * stride;
1055                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1056 #ifdef CONFIG_SND_DEBUG_VERBOSE
1057                         int oldbytes = bytes;
1058 #endif
1059                         bytes = frames * stride;
1060                         snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
1061                                                         oldbytes, bytes);
1062                 }
1063                 /* update the current pointer */
1064                 spin_lock_irqsave(&subs->lock, flags);
1065                 oldptr = subs->hwptr_done;
1066                 subs->hwptr_done += bytes;
1067                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1068                         subs->hwptr_done -= runtime->buffer_size * stride;
1069                 frames = (bytes + (oldptr % stride)) / stride;
1070                 subs->transfer_done += frames;
1071                 if (subs->transfer_done >= runtime->period_size) {
1072                         subs->transfer_done -= runtime->period_size;
1073                         period_elapsed = 1;
1074                 }
1075                 spin_unlock_irqrestore(&subs->lock, flags);
1076                 /* copy a data chunk */
1077                 if (oldptr + bytes > runtime->buffer_size * stride) {
1078                         unsigned int bytes1 =
1079                                         runtime->buffer_size * stride - oldptr;
1080                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1081                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1082                 } else {
1083                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1084                 }
1085         }
1086
1087         if (period_elapsed)
1088                 snd_pcm_period_elapsed(subs->pcm_substream);
1089 }
1090
1091 static void prepare_playback_urb(struct snd_usb_substream *subs,
1092                                  struct urb *urb)
1093 {
1094         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1095         struct snd_usb_endpoint *ep = subs->data_endpoint;
1096         struct snd_urb_ctx *ctx = urb->context;
1097         unsigned int counts, frames, bytes;
1098         int i, stride, period_elapsed = 0;
1099         unsigned long flags;
1100
1101         stride = runtime->frame_bits >> 3;
1102
1103         frames = 0;
1104         urb->number_of_packets = 0;
1105         spin_lock_irqsave(&subs->lock, flags);
1106         for (i = 0; i < ctx->packets; i++) {
1107                 if (ctx->packet_size[i])
1108                         counts = ctx->packet_size[i];
1109                 else
1110                         counts = snd_usb_endpoint_next_packet_size(ep);
1111
1112                 /* set up descriptor */
1113                 urb->iso_frame_desc[i].offset = frames * stride;
1114                 urb->iso_frame_desc[i].length = counts * stride;
1115                 frames += counts;
1116                 urb->number_of_packets++;
1117                 subs->transfer_done += counts;
1118                 if (subs->transfer_done >= runtime->period_size) {
1119                         subs->transfer_done -= runtime->period_size;
1120                         period_elapsed = 1;
1121                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1122                                 if (subs->transfer_done > 0) {
1123                                         /* FIXME: fill-max mode is not
1124                                          * supported yet */
1125                                         frames -= subs->transfer_done;
1126                                         counts -= subs->transfer_done;
1127                                         urb->iso_frame_desc[i].length =
1128                                                 counts * stride;
1129                                         subs->transfer_done = 0;
1130                                 }
1131                                 i++;
1132                                 if (i < ctx->packets) {
1133                                         /* add a transfer delimiter */
1134                                         urb->iso_frame_desc[i].offset =
1135                                                 frames * stride;
1136                                         urb->iso_frame_desc[i].length = 0;
1137                                         urb->number_of_packets++;
1138                                 }
1139                                 break;
1140                         }
1141                 }
1142                 if (period_elapsed &&
1143                     !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1144                         break;
1145         }
1146         bytes = frames * stride;
1147         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1148                 /* err, the transferred area goes over buffer boundary. */
1149                 unsigned int bytes1 =
1150                         runtime->buffer_size * stride - subs->hwptr_done;
1151                 memcpy(urb->transfer_buffer,
1152                        runtime->dma_area + subs->hwptr_done, bytes1);
1153                 memcpy(urb->transfer_buffer + bytes1,
1154                        runtime->dma_area, bytes - bytes1);
1155         } else {
1156                 memcpy(urb->transfer_buffer,
1157                        runtime->dma_area + subs->hwptr_done, bytes);
1158         }
1159         subs->hwptr_done += bytes;
1160         if (subs->hwptr_done >= runtime->buffer_size * stride)
1161                 subs->hwptr_done -= runtime->buffer_size * stride;
1162
1163         /* update delay with exact number of samples queued */
1164         runtime->delay = subs->last_delay;
1165         runtime->delay += frames;
1166         subs->last_delay = runtime->delay;
1167
1168         /* realign last_frame_number */
1169         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1170         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1171
1172         spin_unlock_irqrestore(&subs->lock, flags);
1173         urb->transfer_buffer_length = bytes;
1174         if (period_elapsed)
1175                 snd_pcm_period_elapsed(subs->pcm_substream);
1176 }
1177
1178 /*
1179  * process after playback data complete
1180  * - decrease the delay count again
1181  */
1182 static void retire_playback_urb(struct snd_usb_substream *subs,
1183                                struct urb *urb)
1184 {
1185         unsigned long flags;
1186         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1187         int stride = runtime->frame_bits >> 3;
1188         int processed = urb->transfer_buffer_length / stride;
1189         int est_delay;
1190
1191         /* ignore the delay accounting when procssed=0 is given, i.e.
1192          * silent payloads are procssed before handling the actual data
1193          */
1194         if (!processed)
1195                 return;
1196
1197         spin_lock_irqsave(&subs->lock, flags);
1198         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1199         /* update delay with exact number of samples played */
1200         if (processed > subs->last_delay)
1201                 subs->last_delay = 0;
1202         else
1203                 subs->last_delay -= processed;
1204         runtime->delay = subs->last_delay;
1205
1206         /*
1207          * Report when delay estimate is off by more than 2ms.
1208          * The error should be lower than 2ms since the estimate relies
1209          * on two reads of a counter updated every ms.
1210          */
1211         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1212                 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
1213                         est_delay, subs->last_delay);
1214
1215         spin_unlock_irqrestore(&subs->lock, flags);
1216 }
1217
1218 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1219 {
1220         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1221 }
1222
1223 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1224 {
1225         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1226 }
1227
1228 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1229 {
1230         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1231 }
1232
1233 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1234 {
1235         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1236 }
1237
1238 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1239                                               int cmd)
1240 {
1241         struct snd_usb_substream *subs = substream->runtime->private_data;
1242
1243         switch (cmd) {
1244         case SNDRV_PCM_TRIGGER_START:
1245         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1246                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1247                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1248                 subs->running = 1;
1249                 return 0;
1250         case SNDRV_PCM_TRIGGER_STOP:
1251                 stop_endpoints(subs, 0, 0, 0);
1252                 subs->running = 0;
1253                 return 0;
1254         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1255                 subs->data_endpoint->prepare_data_urb = NULL;
1256                 subs->data_endpoint->retire_data_urb = NULL;
1257                 subs->running = 0;
1258                 return 0;
1259         }
1260
1261         return -EINVAL;
1262 }
1263
1264 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1265                                              int cmd)
1266 {
1267         int err;
1268         struct snd_usb_substream *subs = substream->runtime->private_data;
1269
1270         switch (cmd) {
1271         case SNDRV_PCM_TRIGGER_START:
1272                 err = start_endpoints(subs, 0);
1273                 if (err < 0)
1274                         return err;
1275
1276                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1277                 subs->running = 1;
1278                 return 0;
1279         case SNDRV_PCM_TRIGGER_STOP:
1280                 stop_endpoints(subs, 0, 0, 0);
1281                 subs->running = 0;
1282                 return 0;
1283         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1284                 subs->data_endpoint->retire_data_urb = NULL;
1285                 subs->running = 0;
1286                 return 0;
1287         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1288                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1289                 subs->running = 1;
1290                 return 0;
1291         }
1292
1293         return -EINVAL;
1294 }
1295
1296 static struct snd_pcm_ops snd_usb_playback_ops = {
1297         .open =         snd_usb_playback_open,
1298         .close =        snd_usb_playback_close,
1299         .ioctl =        snd_pcm_lib_ioctl,
1300         .hw_params =    snd_usb_hw_params,
1301         .hw_free =      snd_usb_hw_free,
1302         .prepare =      snd_usb_pcm_prepare,
1303         .trigger =      snd_usb_substream_playback_trigger,
1304         .pointer =      snd_usb_pcm_pointer,
1305         .page =         snd_pcm_lib_get_vmalloc_page,
1306         .mmap =         snd_pcm_lib_mmap_vmalloc,
1307 };
1308
1309 static struct snd_pcm_ops snd_usb_capture_ops = {
1310         .open =         snd_usb_capture_open,
1311         .close =        snd_usb_capture_close,
1312         .ioctl =        snd_pcm_lib_ioctl,
1313         .hw_params =    snd_usb_hw_params,
1314         .hw_free =      snd_usb_hw_free,
1315         .prepare =      snd_usb_pcm_prepare,
1316         .trigger =      snd_usb_substream_capture_trigger,
1317         .pointer =      snd_usb_pcm_pointer,
1318         .page =         snd_pcm_lib_get_vmalloc_page,
1319         .mmap =         snd_pcm_lib_mmap_vmalloc,
1320 };
1321
1322 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1323 {
1324         snd_pcm_set_ops(pcm, stream,
1325                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
1326                         &snd_usb_playback_ops : &snd_usb_capture_ops);
1327 }