linux/sound/usb/pcm.c
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   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 */
  42snd_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 */
  68static 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 */
  87static 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
 146static 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
 170static 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 */
 197int 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
 217static 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
 269static 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
 281static 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 */
 300static 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
 409add_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 */
 445static 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 */
 482static 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 */
 527static 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 */
 548static 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
 618static 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
 633static 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
 678static 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
 732static 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
 785static 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
 818static 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 */
 859static 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
 905static 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
 991rep_err:
 992        snd_usb_autosuspend(subs->stream->chip);
 993        return err;
 994}
 995
 996static 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
1011static 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 */
1034static 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
1091static 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 */
1182static 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
1218static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1219{
1220        return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1221}
1222
1223static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1224{
1225        return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1226}
1227
1228static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1229{
1230        return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1231}
1232
1233static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1234{
1235        return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1236}
1237
1238static 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
1264static 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
1296static 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
1309static 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
1322void 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}
1328
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