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