linux/sound/usb/pcm.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 */
   4
   5#include <linux/init.h>
   6#include <linux/slab.h>
   7#include <linux/bitrev.h>
   8#include <linux/ratelimit.h>
   9#include <linux/usb.h>
  10#include <linux/usb/audio.h>
  11#include <linux/usb/audio-v2.h>
  12
  13#include <sound/core.h>
  14#include <sound/pcm.h>
  15#include <sound/pcm_params.h>
  16
  17#include "usbaudio.h"
  18#include "card.h"
  19#include "quirks.h"
  20#include "debug.h"
  21#include "endpoint.h"
  22#include "helper.h"
  23#include "pcm.h"
  24#include "clock.h"
  25#include "power.h"
  26#include "media.h"
  27
  28#define SUBSTREAM_FLAG_DATA_EP_STARTED  0
  29#define SUBSTREAM_FLAG_SYNC_EP_STARTED  1
  30
  31/* return the estimated delay based on USB frame counters */
  32snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33                                    unsigned int rate)
  34{
  35        int current_frame_number;
  36        int frame_diff;
  37        int est_delay;
  38
  39        if (!subs->last_delay)
  40                return 0; /* short path */
  41
  42        current_frame_number = usb_get_current_frame_number(subs->dev);
  43        /*
  44         * HCD implementations use different widths, use lower 8 bits.
  45         * The delay will be managed up to 256ms, which is more than
  46         * enough
  47         */
  48        frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  49
  50        /* Approximation based on number of samples per USB frame (ms),
  51           some truncation for 44.1 but the estimate is good enough */
  52        est_delay =  frame_diff * rate / 1000;
  53        if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  54                est_delay = subs->last_delay - est_delay;
  55        else
  56                est_delay = subs->last_delay + est_delay;
  57
  58        if (est_delay < 0)
  59                est_delay = 0;
  60        return est_delay;
  61}
  62
  63/*
  64 * return the current pcm pointer.  just based on the hwptr_done value.
  65 */
  66static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  67{
  68        struct snd_usb_substream *subs = substream->runtime->private_data;
  69        unsigned int hwptr_done;
  70
  71        if (atomic_read(&subs->stream->chip->shutdown))
  72                return SNDRV_PCM_POS_XRUN;
  73        spin_lock(&subs->lock);
  74        hwptr_done = subs->hwptr_done;
  75        substream->runtime->delay = snd_usb_pcm_delay(subs,
  76                                                substream->runtime->rate);
  77        spin_unlock(&subs->lock);
  78        return hwptr_done / (substream->runtime->frame_bits >> 3);
  79}
  80
  81/*
  82 * find a matching audio format
  83 */
  84static struct audioformat *find_format(struct snd_usb_substream *subs)
  85{
  86        struct audioformat *fp;
  87        struct audioformat *found = NULL;
  88        int cur_attr = 0, attr;
  89
  90        list_for_each_entry(fp, &subs->fmt_list, list) {
  91                if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
  92                        continue;
  93                if (fp->channels != subs->channels)
  94                        continue;
  95                if (subs->cur_rate < fp->rate_min ||
  96                    subs->cur_rate > fp->rate_max)
  97                        continue;
  98                if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  99                        unsigned int i;
 100                        for (i = 0; i < fp->nr_rates; i++)
 101                                if (fp->rate_table[i] == subs->cur_rate)
 102                                        break;
 103                        if (i >= fp->nr_rates)
 104                                continue;
 105                }
 106                attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 107                if (! found) {
 108                        found = fp;
 109                        cur_attr = attr;
 110                        continue;
 111                }
 112                /* avoid async out and adaptive in if the other method
 113                 * supports the same format.
 114                 * this is a workaround for the case like
 115                 * M-audio audiophile USB.
 116                 */
 117                if (attr != cur_attr) {
 118                        if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 119                             subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 120                            (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 121                             subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 122                                continue;
 123                        if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 124                             subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125                            (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126                             subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 127                                found = fp;
 128                                cur_attr = attr;
 129                                continue;
 130                        }
 131                }
 132                /* find the format with the largest max. packet size */
 133                if (fp->maxpacksize > found->maxpacksize) {
 134                        found = fp;
 135                        cur_attr = attr;
 136                }
 137        }
 138        return found;
 139}
 140
 141static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 142                         struct usb_host_interface *alts,
 143                         struct audioformat *fmt)
 144{
 145        struct usb_device *dev = chip->dev;
 146        unsigned int ep;
 147        unsigned char data[1];
 148        int err;
 149
 150        if (get_iface_desc(alts)->bNumEndpoints < 1)
 151                return -EINVAL;
 152        ep = get_endpoint(alts, 0)->bEndpointAddress;
 153
 154        data[0] = 1;
 155        err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 156                              USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 157                              UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 158                              data, sizeof(data));
 159        if (err < 0) {
 160                usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 161                              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        int err;
 175
 176        data[0] = 1;
 177        err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 178                              USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 179                              UAC2_EP_CS_PITCH << 8, 0,
 180                              data, sizeof(data));
 181        if (err < 0) {
 182                usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 183                              iface, fmt->altsetting);
 184                return err;
 185        }
 186
 187        return 0;
 188}
 189
 190/*
 191 * initialize the pitch control and sample rate
 192 */
 193int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 194                       struct usb_host_interface *alts,
 195                       struct audioformat *fmt)
 196{
 197        /* if endpoint doesn't have pitch control, bail out */
 198        if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199                return 0;
 200
 201        switch (fmt->protocol) {
 202        case UAC_VERSION_1:
 203        default:
 204                return init_pitch_v1(chip, iface, alts, fmt);
 205
 206        case UAC_VERSION_2:
 207                return init_pitch_v2(chip, iface, alts, fmt);
 208        }
 209}
 210
 211static int start_endpoints(struct snd_usb_substream *subs)
 212{
 213        int err;
 214
 215        if (!subs->data_endpoint)
 216                return -EINVAL;
 217
 218        if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 219                struct snd_usb_endpoint *ep = subs->data_endpoint;
 220
 221                dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 222
 223                ep->data_subs = subs;
 224                err = snd_usb_endpoint_start(ep);
 225                if (err < 0) {
 226                        clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 227                        return err;
 228                }
 229        }
 230
 231        if (subs->sync_endpoint &&
 232            !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 233                struct snd_usb_endpoint *ep = subs->sync_endpoint;
 234
 235                if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 236                    subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 237                        err = usb_set_interface(subs->dev,
 238                                                subs->sync_endpoint->iface,
 239                                                subs->sync_endpoint->altsetting);
 240                        if (err < 0) {
 241                                clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 242                                dev_err(&subs->dev->dev,
 243                                           "%d:%d: cannot set interface (%d)\n",
 244                                           subs->sync_endpoint->iface,
 245                                           subs->sync_endpoint->altsetting, err);
 246                                return -EIO;
 247                        }
 248                }
 249
 250                dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 251
 252                ep->sync_slave = subs->data_endpoint;
 253                err = snd_usb_endpoint_start(ep);
 254                if (err < 0) {
 255                        clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 256                        return err;
 257                }
 258        }
 259
 260        return 0;
 261}
 262
 263static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
 264{
 265        if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 266                snd_usb_endpoint_stop(subs->sync_endpoint);
 267
 268        if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 269                snd_usb_endpoint_stop(subs->data_endpoint);
 270
 271        if (wait) {
 272                snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 273                snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 274        }
 275}
 276
 277static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 278                                     unsigned int altsetting,
 279                                     struct usb_host_interface **alts,
 280                                     unsigned int *ep)
 281{
 282        struct usb_interface *iface;
 283        struct usb_interface_descriptor *altsd;
 284        struct usb_endpoint_descriptor *epd;
 285
 286        iface = usb_ifnum_to_if(dev, ifnum);
 287        if (!iface || iface->num_altsetting < altsetting + 1)
 288                return -ENOENT;
 289        *alts = &iface->altsetting[altsetting];
 290        altsd = get_iface_desc(*alts);
 291        if (altsd->bAlternateSetting != altsetting ||
 292            altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 293            (altsd->bInterfaceSubClass != 2 &&
 294             altsd->bInterfaceProtocol != 2   ) ||
 295            altsd->bNumEndpoints < 1)
 296                return -ENOENT;
 297        epd = get_endpoint(*alts, 0);
 298        if (!usb_endpoint_is_isoc_in(epd) ||
 299            (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 300                                        USB_ENDPOINT_USAGE_IMPLICIT_FB)
 301                return -ENOENT;
 302        *ep = epd->bEndpointAddress;
 303        return 0;
 304}
 305
 306/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 307 * applies. Returns 1 if a quirk was found.
 308 */
 309static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 310                                         struct usb_device *dev,
 311                                         struct usb_interface_descriptor *altsd,
 312                                         unsigned int attr)
 313{
 314        struct usb_host_interface *alts;
 315        struct usb_interface *iface;
 316        unsigned int ep;
 317        unsigned int ifnum;
 318
 319        /* Implicit feedback sync EPs consumers are always playback EPs */
 320        if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 321                return 0;
 322
 323        switch (subs->stream->chip->usb_id) {
 324        case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 325        case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 326                ep = 0x81;
 327                ifnum = 3;
 328                goto add_sync_ep_from_ifnum;
 329        case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 330        case USB_ID(0x0763, 0x2081):
 331                ep = 0x81;
 332                ifnum = 2;
 333                goto add_sync_ep_from_ifnum;
 334        case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 335                ep = 0x86;
 336                ifnum = 2;
 337                goto add_sync_ep_from_ifnum;
 338        case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 339                ep = 0x81;
 340                ifnum = 2;
 341                goto add_sync_ep_from_ifnum;
 342        case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 343        case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 344                ep = 0x81;
 345                ifnum = 1;
 346                goto add_sync_ep_from_ifnum;
 347        case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
 348                ep = 0x84;
 349                ifnum = 0;
 350                goto add_sync_ep_from_ifnum;
 351        case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 352                /* BOSS Katana amplifiers do not need quirks */
 353                return 0;
 354        }
 355
 356        if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 357            altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 358            altsd->bInterfaceProtocol == 2 &&
 359            altsd->bNumEndpoints == 1 &&
 360            USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 361            search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 362                                      altsd->bAlternateSetting,
 363                                      &alts, &ep) >= 0) {
 364                goto add_sync_ep;
 365        }
 366
 367        /* No quirk */
 368        return 0;
 369
 370add_sync_ep_from_ifnum:
 371        iface = usb_ifnum_to_if(dev, ifnum);
 372
 373        if (!iface || iface->num_altsetting == 0)
 374                return -EINVAL;
 375
 376        alts = &iface->altsetting[1];
 377
 378add_sync_ep:
 379        subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 380                                                   alts, ep, !subs->direction,
 381                                                   SND_USB_ENDPOINT_TYPE_DATA);
 382        if (!subs->sync_endpoint)
 383                return -EINVAL;
 384
 385        subs->data_endpoint->sync_master = subs->sync_endpoint;
 386
 387        return 1;
 388}
 389
 390static int set_sync_endpoint(struct snd_usb_substream *subs,
 391                             struct audioformat *fmt,
 392                             struct usb_device *dev,
 393                             struct usb_host_interface *alts,
 394                             struct usb_interface_descriptor *altsd)
 395{
 396        int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 397        unsigned int ep, attr;
 398        bool implicit_fb;
 399        int err;
 400
 401        /* we need a sync pipe in async OUT or adaptive IN mode */
 402        /* check the number of EP, since some devices have broken
 403         * descriptors which fool us.  if it has only one EP,
 404         * assume it as adaptive-out or sync-in.
 405         */
 406        attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 407
 408        if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 409                (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 410
 411                /*
 412                 * In these modes the notion of sync_endpoint is irrelevant.
 413                 * Reset pointers to avoid using stale data from previously
 414                 * used settings, e.g. when configuration and endpoints were
 415                 * changed
 416                 */
 417
 418                subs->sync_endpoint = NULL;
 419                subs->data_endpoint->sync_master = NULL;
 420        }
 421
 422        err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 423        if (err < 0)
 424                return err;
 425
 426        /* endpoint set by quirk */
 427        if (err > 0)
 428                return 0;
 429
 430        if (altsd->bNumEndpoints < 2)
 431                return 0;
 432
 433        if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 434                             attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 435            (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 436                return 0;
 437
 438        /*
 439         * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 440         * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 441         * error fall back to SYNC mode and don't create sync endpoint
 442         */
 443
 444        /* check sync-pipe endpoint */
 445        /* ... and check descriptor size before accessing bSynchAddress
 446           because there is a version of the SB Audigy 2 NX firmware lacking
 447           the audio fields in the endpoint descriptors */
 448        if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 449            (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 450             get_endpoint(alts, 1)->bSynchAddress != 0)) {
 451                dev_err(&dev->dev,
 452                        "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 453                           fmt->iface, fmt->altsetting,
 454                           get_endpoint(alts, 1)->bmAttributes,
 455                           get_endpoint(alts, 1)->bLength,
 456                           get_endpoint(alts, 1)->bSynchAddress);
 457                if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 458                        return 0;
 459                return -EINVAL;
 460        }
 461        ep = get_endpoint(alts, 1)->bEndpointAddress;
 462        if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 463            get_endpoint(alts, 0)->bSynchAddress != 0 &&
 464            ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 465             (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 466                dev_err(&dev->dev,
 467                        "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 468                           fmt->iface, fmt->altsetting,
 469                           is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 470                if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 471                        return 0;
 472                return -EINVAL;
 473        }
 474
 475        implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 476                        == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 477
 478        subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 479                                                   alts, ep, !subs->direction,
 480                                                   implicit_fb ?
 481                                                        SND_USB_ENDPOINT_TYPE_DATA :
 482                                                        SND_USB_ENDPOINT_TYPE_SYNC);
 483        if (!subs->sync_endpoint) {
 484                if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 485                        return 0;
 486                return -EINVAL;
 487        }
 488
 489        subs->data_endpoint->sync_master = subs->sync_endpoint;
 490
 491        return 0;
 492}
 493
 494/*
 495 * find a matching format and set up the interface
 496 */
 497static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 498{
 499        struct usb_device *dev = subs->dev;
 500        struct usb_host_interface *alts;
 501        struct usb_interface_descriptor *altsd;
 502        struct usb_interface *iface;
 503        int err;
 504
 505        iface = usb_ifnum_to_if(dev, fmt->iface);
 506        if (WARN_ON(!iface))
 507                return -EINVAL;
 508        alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 509        altsd = get_iface_desc(alts);
 510        if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 511                return -EINVAL;
 512
 513        if (fmt == subs->cur_audiofmt)
 514                return 0;
 515
 516        /* close the old interface */
 517        if (subs->interface >= 0 && subs->interface != fmt->iface) {
 518                if (!subs->stream->chip->keep_iface) {
 519                        err = usb_set_interface(subs->dev, subs->interface, 0);
 520                        if (err < 0) {
 521                                dev_err(&dev->dev,
 522                                        "%d:%d: return to setting 0 failed (%d)\n",
 523                                        fmt->iface, fmt->altsetting, err);
 524                                return -EIO;
 525                        }
 526                }
 527                subs->interface = -1;
 528                subs->altset_idx = 0;
 529        }
 530
 531        /* set interface */
 532        if (iface->cur_altsetting != alts) {
 533                err = snd_usb_select_mode_quirk(subs, fmt);
 534                if (err < 0)
 535                        return -EIO;
 536
 537                err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 538                if (err < 0) {
 539                        dev_err(&dev->dev,
 540                                "%d:%d: usb_set_interface failed (%d)\n",
 541                                fmt->iface, fmt->altsetting, err);
 542                        return -EIO;
 543                }
 544                dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 545                        fmt->iface, fmt->altsetting);
 546                snd_usb_set_interface_quirk(dev);
 547        }
 548
 549        subs->interface = fmt->iface;
 550        subs->altset_idx = fmt->altset_idx;
 551        subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 552                                                   alts, fmt->endpoint, subs->direction,
 553                                                   SND_USB_ENDPOINT_TYPE_DATA);
 554
 555        if (!subs->data_endpoint)
 556                return -EINVAL;
 557
 558        err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 559        if (err < 0)
 560                return err;
 561
 562        err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 563        if (err < 0)
 564                return err;
 565
 566        subs->cur_audiofmt = fmt;
 567
 568        snd_usb_set_format_quirk(subs, fmt);
 569
 570        return 0;
 571}
 572
 573/*
 574 * Return the score of matching two audioformats.
 575 * Veto the audioformat if:
 576 * - It has no channels for some reason.
 577 * - Requested PCM format is not supported.
 578 * - Requested sample rate is not supported.
 579 */
 580static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 581                                       struct audioformat *fp,
 582                                       struct audioformat *match, int rate,
 583                                       snd_pcm_format_t pcm_format)
 584{
 585        int i;
 586        int score = 0;
 587
 588        if (fp->channels < 1) {
 589                dev_dbg(&subs->dev->dev,
 590                        "%s: (fmt @%p) no channels\n", __func__, fp);
 591                return 0;
 592        }
 593
 594        if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 595                dev_dbg(&subs->dev->dev,
 596                        "%s: (fmt @%p) no match for format %d\n", __func__,
 597                        fp, pcm_format);
 598                return 0;
 599        }
 600
 601        for (i = 0; i < fp->nr_rates; i++) {
 602                if (fp->rate_table[i] == rate) {
 603                        score++;
 604                        break;
 605                }
 606        }
 607        if (!score) {
 608                dev_dbg(&subs->dev->dev,
 609                        "%s: (fmt @%p) no match for rate %d\n", __func__,
 610                        fp, rate);
 611                return 0;
 612        }
 613
 614        if (fp->channels == match->channels)
 615                score++;
 616
 617        dev_dbg(&subs->dev->dev,
 618                "%s: (fmt @%p) score %d\n", __func__, fp, score);
 619
 620        return score;
 621}
 622
 623/*
 624 * Configure the sync ep using the rate and pcm format of the data ep.
 625 */
 626static int configure_sync_endpoint(struct snd_usb_substream *subs)
 627{
 628        int ret;
 629        struct audioformat *fp;
 630        struct audioformat *sync_fp = NULL;
 631        int cur_score = 0;
 632        int sync_period_bytes = subs->period_bytes;
 633        struct snd_usb_substream *sync_subs =
 634                &subs->stream->substream[subs->direction ^ 1];
 635
 636        if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 637            !subs->stream)
 638                return snd_usb_endpoint_set_params(subs->sync_endpoint,
 639                                                   subs->pcm_format,
 640                                                   subs->channels,
 641                                                   subs->period_bytes,
 642                                                   0, 0,
 643                                                   subs->cur_rate,
 644                                                   subs->cur_audiofmt,
 645                                                   NULL);
 646
 647        /* Try to find the best matching audioformat. */
 648        list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 649                int score = match_endpoint_audioformats(subs,
 650                                                        fp, subs->cur_audiofmt,
 651                        subs->cur_rate, subs->pcm_format);
 652
 653                if (score > cur_score) {
 654                        sync_fp = fp;
 655                        cur_score = score;
 656                }
 657        }
 658
 659        if (unlikely(sync_fp == NULL)) {
 660                dev_err(&subs->dev->dev,
 661                        "%s: no valid audioformat for sync ep %x found\n",
 662                        __func__, sync_subs->ep_num);
 663                return -EINVAL;
 664        }
 665
 666        /*
 667         * Recalculate the period bytes if channel number differ between
 668         * data and sync ep audioformat.
 669         */
 670        if (sync_fp->channels != subs->channels) {
 671                sync_period_bytes = (subs->period_bytes / subs->channels) *
 672                        sync_fp->channels;
 673                dev_dbg(&subs->dev->dev,
 674                        "%s: adjusted sync ep period bytes (%d -> %d)\n",
 675                        __func__, subs->period_bytes, sync_period_bytes);
 676        }
 677
 678        ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 679                                          subs->pcm_format,
 680                                          sync_fp->channels,
 681                                          sync_period_bytes,
 682                                          0, 0,
 683                                          subs->cur_rate,
 684                                          sync_fp,
 685                                          NULL);
 686
 687        return ret;
 688}
 689
 690/*
 691 * configure endpoint params
 692 *
 693 * called  during initial setup and upon resume
 694 */
 695static int configure_endpoint(struct snd_usb_substream *subs)
 696{
 697        int ret;
 698
 699        /* format changed */
 700        stop_endpoints(subs, true);
 701        ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 702                                          subs->pcm_format,
 703                                          subs->channels,
 704                                          subs->period_bytes,
 705                                          subs->period_frames,
 706                                          subs->buffer_periods,
 707                                          subs->cur_rate,
 708                                          subs->cur_audiofmt,
 709                                          subs->sync_endpoint);
 710        if (ret < 0)
 711                return ret;
 712
 713        if (subs->sync_endpoint)
 714                ret = configure_sync_endpoint(subs);
 715
 716        return ret;
 717}
 718
 719static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 720{
 721        int ret;
 722
 723        if (!subs->str_pd)
 724                return 0;
 725
 726        ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 727        if (ret < 0) {
 728                dev_err(&subs->dev->dev,
 729                        "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 730                        subs->str_pd->pd_id, state, ret);
 731                return ret;
 732        }
 733
 734        return 0;
 735}
 736
 737int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 738{
 739        int ret;
 740
 741        ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 742        if (ret < 0)
 743                return ret;
 744
 745        ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 746        if (ret < 0)
 747                return ret;
 748
 749        return 0;
 750}
 751
 752int snd_usb_pcm_resume(struct snd_usb_stream *as)
 753{
 754        int ret;
 755
 756        ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 757        if (ret < 0)
 758                return ret;
 759
 760        ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 761        if (ret < 0)
 762                return ret;
 763
 764        return 0;
 765}
 766
 767/*
 768 * hw_params callback
 769 *
 770 * allocate a buffer and set the given audio format.
 771 *
 772 * so far we use a physically linear buffer although packetize transfer
 773 * doesn't need a continuous area.
 774 * if sg buffer is supported on the later version of alsa, we'll follow
 775 * that.
 776 */
 777static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 778                             struct snd_pcm_hw_params *hw_params)
 779{
 780        struct snd_usb_substream *subs = substream->runtime->private_data;
 781        struct audioformat *fmt;
 782        int ret;
 783
 784        ret = snd_media_start_pipeline(subs);
 785        if (ret)
 786                return ret;
 787
 788        if (snd_usb_use_vmalloc)
 789                ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 790                                                       params_buffer_bytes(hw_params));
 791        else
 792                ret = snd_pcm_lib_malloc_pages(substream,
 793                                               params_buffer_bytes(hw_params));
 794        if (ret < 0)
 795                goto stop_pipeline;
 796
 797        subs->pcm_format = params_format(hw_params);
 798        subs->period_bytes = params_period_bytes(hw_params);
 799        subs->period_frames = params_period_size(hw_params);
 800        subs->buffer_periods = params_periods(hw_params);
 801        subs->channels = params_channels(hw_params);
 802        subs->cur_rate = params_rate(hw_params);
 803
 804        fmt = find_format(subs);
 805        if (!fmt) {
 806                dev_dbg(&subs->dev->dev,
 807                        "cannot set format: format = %#x, rate = %d, channels = %d\n",
 808                           subs->pcm_format, subs->cur_rate, subs->channels);
 809                ret = -EINVAL;
 810                goto stop_pipeline;
 811        }
 812
 813        ret = snd_usb_lock_shutdown(subs->stream->chip);
 814        if (ret < 0)
 815                goto stop_pipeline;
 816
 817        ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 818        if (ret < 0)
 819                goto unlock;
 820
 821        ret = set_format(subs, fmt);
 822        if (ret < 0)
 823                goto unlock;
 824
 825        subs->interface = fmt->iface;
 826        subs->altset_idx = fmt->altset_idx;
 827        subs->need_setup_ep = true;
 828
 829 unlock:
 830        snd_usb_unlock_shutdown(subs->stream->chip);
 831        if (ret < 0)
 832                goto stop_pipeline;
 833        return ret;
 834
 835 stop_pipeline:
 836        snd_media_stop_pipeline(subs);
 837        return ret;
 838}
 839
 840/*
 841 * hw_free callback
 842 *
 843 * reset the audio format and release the buffer
 844 */
 845static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 846{
 847        struct snd_usb_substream *subs = substream->runtime->private_data;
 848
 849        snd_media_stop_pipeline(subs);
 850        subs->cur_audiofmt = NULL;
 851        subs->cur_rate = 0;
 852        subs->period_bytes = 0;
 853        if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 854                stop_endpoints(subs, true);
 855                snd_usb_endpoint_deactivate(subs->sync_endpoint);
 856                snd_usb_endpoint_deactivate(subs->data_endpoint);
 857                snd_usb_unlock_shutdown(subs->stream->chip);
 858        }
 859
 860        if (snd_usb_use_vmalloc)
 861                return snd_pcm_lib_free_vmalloc_buffer(substream);
 862        else
 863                return snd_pcm_lib_free_pages(substream);
 864}
 865
 866/*
 867 * prepare callback
 868 *
 869 * only a few subtle things...
 870 */
 871static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 872{
 873        struct snd_pcm_runtime *runtime = substream->runtime;
 874        struct snd_usb_substream *subs = runtime->private_data;
 875        struct usb_host_interface *alts;
 876        struct usb_interface *iface;
 877        int ret;
 878
 879        if (! subs->cur_audiofmt) {
 880                dev_err(&subs->dev->dev, "no format is specified!\n");
 881                return -ENXIO;
 882        }
 883
 884        ret = snd_usb_lock_shutdown(subs->stream->chip);
 885        if (ret < 0)
 886                return ret;
 887        if (snd_BUG_ON(!subs->data_endpoint)) {
 888                ret = -EIO;
 889                goto unlock;
 890        }
 891
 892        snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 893        snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 894
 895        ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 896        if (ret < 0)
 897                goto unlock;
 898
 899        ret = set_format(subs, subs->cur_audiofmt);
 900        if (ret < 0)
 901                goto unlock;
 902
 903        if (subs->need_setup_ep) {
 904
 905                iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 906                alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 907                ret = snd_usb_init_sample_rate(subs->stream->chip,
 908                                               subs->cur_audiofmt->iface,
 909                                               alts,
 910                                               subs->cur_audiofmt,
 911                                               subs->cur_rate);
 912                if (ret < 0)
 913                        goto unlock;
 914
 915                ret = configure_endpoint(subs);
 916                if (ret < 0)
 917                        goto unlock;
 918                subs->need_setup_ep = false;
 919        }
 920
 921        /* some unit conversions in runtime */
 922        subs->data_endpoint->maxframesize =
 923                bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 924        subs->data_endpoint->curframesize =
 925                bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 926
 927        /* reset the pointer */
 928        subs->hwptr_done = 0;
 929        subs->transfer_done = 0;
 930        subs->last_delay = 0;
 931        subs->last_frame_number = 0;
 932        runtime->delay = 0;
 933
 934        /* for playback, submit the URBs now; otherwise, the first hwptr_done
 935         * updates for all URBs would happen at the same time when starting */
 936        if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 937                ret = start_endpoints(subs);
 938
 939 unlock:
 940        snd_usb_unlock_shutdown(subs->stream->chip);
 941        return ret;
 942}
 943
 944static const struct snd_pcm_hardware snd_usb_hardware =
 945{
 946        .info =                 SNDRV_PCM_INFO_MMAP |
 947                                SNDRV_PCM_INFO_MMAP_VALID |
 948                                SNDRV_PCM_INFO_BATCH |
 949                                SNDRV_PCM_INFO_INTERLEAVED |
 950                                SNDRV_PCM_INFO_BLOCK_TRANSFER |
 951                                SNDRV_PCM_INFO_PAUSE,
 952        .buffer_bytes_max =     1024 * 1024,
 953        .period_bytes_min =     64,
 954        .period_bytes_max =     512 * 1024,
 955        .periods_min =          2,
 956        .periods_max =          1024,
 957};
 958
 959static int hw_check_valid_format(struct snd_usb_substream *subs,
 960                                 struct snd_pcm_hw_params *params,
 961                                 struct audioformat *fp)
 962{
 963        struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 964        struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 965        struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 966        struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 967        struct snd_mask check_fmts;
 968        unsigned int ptime;
 969
 970        /* check the format */
 971        snd_mask_none(&check_fmts);
 972        check_fmts.bits[0] = (u32)fp->formats;
 973        check_fmts.bits[1] = (u32)(fp->formats >> 32);
 974        snd_mask_intersect(&check_fmts, fmts);
 975        if (snd_mask_empty(&check_fmts)) {
 976                hwc_debug("   > check: no supported format %d\n", fp->format);
 977                return 0;
 978        }
 979        /* check the channels */
 980        if (fp->channels < ct->min || fp->channels > ct->max) {
 981                hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 982                return 0;
 983        }
 984        /* check the rate is within the range */
 985        if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 986                hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 987                return 0;
 988        }
 989        if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 990                hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 991                return 0;
 992        }
 993        /* check whether the period time is >= the data packet interval */
 994        if (subs->speed != USB_SPEED_FULL) {
 995                ptime = 125 * (1 << fp->datainterval);
 996                if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 997                        hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 998                        return 0;
 999                }
1000        }
1001        return 1;
1002}
1003
1004static int hw_rule_rate(struct snd_pcm_hw_params *params,
1005                        struct snd_pcm_hw_rule *rule)
1006{
1007        struct snd_usb_substream *subs = rule->private;
1008        struct audioformat *fp;
1009        struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1010        unsigned int rmin, rmax;
1011        int changed;
1012
1013        hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1014        changed = 0;
1015        rmin = rmax = 0;
1016        list_for_each_entry(fp, &subs->fmt_list, list) {
1017                if (!hw_check_valid_format(subs, params, fp))
1018                        continue;
1019                if (changed++) {
1020                        if (rmin > fp->rate_min)
1021                                rmin = fp->rate_min;
1022                        if (rmax < fp->rate_max)
1023                                rmax = fp->rate_max;
1024                } else {
1025                        rmin = fp->rate_min;
1026                        rmax = fp->rate_max;
1027                }
1028        }
1029
1030        if (!changed) {
1031                hwc_debug("  --> get empty\n");
1032                it->empty = 1;
1033                return -EINVAL;
1034        }
1035
1036        changed = 0;
1037        if (it->min < rmin) {
1038                it->min = rmin;
1039                it->openmin = 0;
1040                changed = 1;
1041        }
1042        if (it->max > rmax) {
1043                it->max = rmax;
1044                it->openmax = 0;
1045                changed = 1;
1046        }
1047        if (snd_interval_checkempty(it)) {
1048                it->empty = 1;
1049                return -EINVAL;
1050        }
1051        hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1052        return changed;
1053}
1054
1055
1056static int hw_rule_channels(struct snd_pcm_hw_params *params,
1057                            struct snd_pcm_hw_rule *rule)
1058{
1059        struct snd_usb_substream *subs = rule->private;
1060        struct audioformat *fp;
1061        struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1062        unsigned int rmin, rmax;
1063        int changed;
1064
1065        hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1066        changed = 0;
1067        rmin = rmax = 0;
1068        list_for_each_entry(fp, &subs->fmt_list, list) {
1069                if (!hw_check_valid_format(subs, params, fp))
1070                        continue;
1071                if (changed++) {
1072                        if (rmin > fp->channels)
1073                                rmin = fp->channels;
1074                        if (rmax < fp->channels)
1075                                rmax = fp->channels;
1076                } else {
1077                        rmin = fp->channels;
1078                        rmax = fp->channels;
1079                }
1080        }
1081
1082        if (!changed) {
1083                hwc_debug("  --> get empty\n");
1084                it->empty = 1;
1085                return -EINVAL;
1086        }
1087
1088        changed = 0;
1089        if (it->min < rmin) {
1090                it->min = rmin;
1091                it->openmin = 0;
1092                changed = 1;
1093        }
1094        if (it->max > rmax) {
1095                it->max = rmax;
1096                it->openmax = 0;
1097                changed = 1;
1098        }
1099        if (snd_interval_checkempty(it)) {
1100                it->empty = 1;
1101                return -EINVAL;
1102        }
1103        hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1104        return changed;
1105}
1106
1107static int hw_rule_format(struct snd_pcm_hw_params *params,
1108                          struct snd_pcm_hw_rule *rule)
1109{
1110        struct snd_usb_substream *subs = rule->private;
1111        struct audioformat *fp;
1112        struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1113        u64 fbits;
1114        u32 oldbits[2];
1115        int changed;
1116
1117        hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1118        fbits = 0;
1119        list_for_each_entry(fp, &subs->fmt_list, list) {
1120                if (!hw_check_valid_format(subs, params, fp))
1121                        continue;
1122                fbits |= fp->formats;
1123        }
1124
1125        oldbits[0] = fmt->bits[0];
1126        oldbits[1] = fmt->bits[1];
1127        fmt->bits[0] &= (u32)fbits;
1128        fmt->bits[1] &= (u32)(fbits >> 32);
1129        if (!fmt->bits[0] && !fmt->bits[1]) {
1130                hwc_debug("  --> get empty\n");
1131                return -EINVAL;
1132        }
1133        changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1134        hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1135        return changed;
1136}
1137
1138static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1139                               struct snd_pcm_hw_rule *rule)
1140{
1141        struct snd_usb_substream *subs = rule->private;
1142        struct audioformat *fp;
1143        struct snd_interval *it;
1144        unsigned char min_datainterval;
1145        unsigned int pmin;
1146        int changed;
1147
1148        it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1149        hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1150        min_datainterval = 0xff;
1151        list_for_each_entry(fp, &subs->fmt_list, list) {
1152                if (!hw_check_valid_format(subs, params, fp))
1153                        continue;
1154                min_datainterval = min(min_datainterval, fp->datainterval);
1155        }
1156        if (min_datainterval == 0xff) {
1157                hwc_debug("  --> get empty\n");
1158                it->empty = 1;
1159                return -EINVAL;
1160        }
1161        pmin = 125 * (1 << min_datainterval);
1162        changed = 0;
1163        if (it->min < pmin) {
1164                it->min = pmin;
1165                it->openmin = 0;
1166                changed = 1;
1167        }
1168        if (snd_interval_checkempty(it)) {
1169                it->empty = 1;
1170                return -EINVAL;
1171        }
1172        hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1173        return changed;
1174}
1175
1176/*
1177 *  If the device supports unusual bit rates, does the request meet these?
1178 */
1179static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1180                                  struct snd_usb_substream *subs)
1181{
1182        struct audioformat *fp;
1183        int *rate_list;
1184        int count = 0, needs_knot = 0;
1185        int err;
1186
1187        kfree(subs->rate_list.list);
1188        subs->rate_list.list = NULL;
1189
1190        list_for_each_entry(fp, &subs->fmt_list, list) {
1191                if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1192                        return 0;
1193                count += fp->nr_rates;
1194                if (fp->rates & SNDRV_PCM_RATE_KNOT)
1195                        needs_knot = 1;
1196        }
1197        if (!needs_knot)
1198                return 0;
1199
1200        subs->rate_list.list = rate_list =
1201                kmalloc_array(count, sizeof(int), GFP_KERNEL);
1202        if (!subs->rate_list.list)
1203                return -ENOMEM;
1204        subs->rate_list.count = count;
1205        subs->rate_list.mask = 0;
1206        count = 0;
1207        list_for_each_entry(fp, &subs->fmt_list, list) {
1208                int i;
1209                for (i = 0; i < fp->nr_rates; i++)
1210                        rate_list[count++] = fp->rate_table[i];
1211        }
1212        err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1213                                         &subs->rate_list);
1214        if (err < 0)
1215                return err;
1216
1217        return 0;
1218}
1219
1220
1221/*
1222 * set up the runtime hardware information.
1223 */
1224
1225static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1226{
1227        struct audioformat *fp;
1228        unsigned int pt, ptmin;
1229        int param_period_time_if_needed;
1230        int err;
1231
1232        runtime->hw.formats = subs->formats;
1233
1234        runtime->hw.rate_min = 0x7fffffff;
1235        runtime->hw.rate_max = 0;
1236        runtime->hw.channels_min = 256;
1237        runtime->hw.channels_max = 0;
1238        runtime->hw.rates = 0;
1239        ptmin = UINT_MAX;
1240        /* check min/max rates and channels */
1241        list_for_each_entry(fp, &subs->fmt_list, list) {
1242                runtime->hw.rates |= fp->rates;
1243                if (runtime->hw.rate_min > fp->rate_min)
1244                        runtime->hw.rate_min = fp->rate_min;
1245                if (runtime->hw.rate_max < fp->rate_max)
1246                        runtime->hw.rate_max = fp->rate_max;
1247                if (runtime->hw.channels_min > fp->channels)
1248                        runtime->hw.channels_min = fp->channels;
1249                if (runtime->hw.channels_max < fp->channels)
1250                        runtime->hw.channels_max = fp->channels;
1251                if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1252                        /* FIXME: there might be more than one audio formats... */
1253                        runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1254                                fp->frame_size;
1255                }
1256                pt = 125 * (1 << fp->datainterval);
1257                ptmin = min(ptmin, pt);
1258        }
1259
1260        param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1261        if (subs->speed == USB_SPEED_FULL)
1262                /* full speed devices have fixed data packet interval */
1263                ptmin = 1000;
1264        if (ptmin == 1000)
1265                /* if period time doesn't go below 1 ms, no rules needed */
1266                param_period_time_if_needed = -1;
1267
1268        err = snd_pcm_hw_constraint_minmax(runtime,
1269                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1270                                           ptmin, UINT_MAX);
1271        if (err < 0)
1272                return err;
1273
1274        err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1275                                  hw_rule_rate, subs,
1276                                  SNDRV_PCM_HW_PARAM_FORMAT,
1277                                  SNDRV_PCM_HW_PARAM_CHANNELS,
1278                                  param_period_time_if_needed,
1279                                  -1);
1280        if (err < 0)
1281                return err;
1282        err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1283                                  hw_rule_channels, subs,
1284                                  SNDRV_PCM_HW_PARAM_FORMAT,
1285                                  SNDRV_PCM_HW_PARAM_RATE,
1286                                  param_period_time_if_needed,
1287                                  -1);
1288        if (err < 0)
1289                return err;
1290        err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1291                                  hw_rule_format, subs,
1292                                  SNDRV_PCM_HW_PARAM_RATE,
1293                                  SNDRV_PCM_HW_PARAM_CHANNELS,
1294                                  param_period_time_if_needed,
1295                                  -1);
1296        if (err < 0)
1297                return err;
1298        if (param_period_time_if_needed >= 0) {
1299                err = snd_pcm_hw_rule_add(runtime, 0,
1300                                          SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1301                                          hw_rule_period_time, subs,
1302                                          SNDRV_PCM_HW_PARAM_FORMAT,
1303                                          SNDRV_PCM_HW_PARAM_CHANNELS,
1304                                          SNDRV_PCM_HW_PARAM_RATE,
1305                                          -1);
1306                if (err < 0)
1307                        return err;
1308        }
1309        err = snd_usb_pcm_check_knot(runtime, subs);
1310        if (err < 0)
1311                return err;
1312
1313        return snd_usb_autoresume(subs->stream->chip);
1314}
1315
1316static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1317{
1318        int direction = substream->stream;
1319        struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1320        struct snd_pcm_runtime *runtime = substream->runtime;
1321        struct snd_usb_substream *subs = &as->substream[direction];
1322        int ret;
1323
1324        subs->interface = -1;
1325        subs->altset_idx = 0;
1326        runtime->hw = snd_usb_hardware;
1327        runtime->private_data = subs;
1328        subs->pcm_substream = substream;
1329        /* runtime PM is also done there */
1330
1331        /* initialize DSD/DOP context */
1332        subs->dsd_dop.byte_idx = 0;
1333        subs->dsd_dop.channel = 0;
1334        subs->dsd_dop.marker = 1;
1335
1336        ret = setup_hw_info(runtime, subs);
1337        if (ret == 0) {
1338                ret = snd_media_stream_init(subs, as->pcm, direction);
1339                if (ret)
1340                        snd_usb_autosuspend(subs->stream->chip);
1341        }
1342        return ret;
1343}
1344
1345static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1346{
1347        int direction = substream->stream;
1348        struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1349        struct snd_usb_substream *subs = &as->substream[direction];
1350        int ret;
1351
1352        stop_endpoints(subs, true);
1353        snd_media_stop_pipeline(subs);
1354
1355        if (!as->chip->keep_iface &&
1356            subs->interface >= 0 &&
1357            !snd_usb_lock_shutdown(subs->stream->chip)) {
1358                usb_set_interface(subs->dev, subs->interface, 0);
1359                subs->interface = -1;
1360                ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1361                snd_usb_unlock_shutdown(subs->stream->chip);
1362                if (ret < 0)
1363                        return ret;
1364        }
1365
1366        subs->pcm_substream = NULL;
1367        snd_usb_autosuspend(subs->stream->chip);
1368
1369        return 0;
1370}
1371
1372/* Since a URB can handle only a single linear buffer, we must use double
1373 * buffering when the data to be transferred overflows the buffer boundary.
1374 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1375 * for all URBs.
1376 */
1377static void retire_capture_urb(struct snd_usb_substream *subs,
1378                               struct urb *urb)
1379{
1380        struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1381        unsigned int stride, frames, bytes, oldptr;
1382        int i, period_elapsed = 0;
1383        unsigned long flags;
1384        unsigned char *cp;
1385        int current_frame_number;
1386
1387        /* read frame number here, update pointer in critical section */
1388        current_frame_number = usb_get_current_frame_number(subs->dev);
1389
1390        stride = runtime->frame_bits >> 3;
1391
1392        for (i = 0; i < urb->number_of_packets; i++) {
1393                cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1394                if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1395                        dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1396                                i, urb->iso_frame_desc[i].status);
1397                        // continue;
1398                }
1399                bytes = urb->iso_frame_desc[i].actual_length;
1400                frames = bytes / stride;
1401                if (!subs->txfr_quirk)
1402                        bytes = frames * stride;
1403                if (bytes % (runtime->sample_bits >> 3) != 0) {
1404                        int oldbytes = bytes;
1405                        bytes = frames * stride;
1406                        dev_warn_ratelimited(&subs->dev->dev,
1407                                 "Corrected urb data len. %d->%d\n",
1408                                                        oldbytes, bytes);
1409                }
1410                /* update the current pointer */
1411                spin_lock_irqsave(&subs->lock, flags);
1412                oldptr = subs->hwptr_done;
1413                subs->hwptr_done += bytes;
1414                if (subs->hwptr_done >= runtime->buffer_size * stride)
1415                        subs->hwptr_done -= runtime->buffer_size * stride;
1416                frames = (bytes + (oldptr % stride)) / stride;
1417                subs->transfer_done += frames;
1418                if (subs->transfer_done >= runtime->period_size) {
1419                        subs->transfer_done -= runtime->period_size;
1420                        period_elapsed = 1;
1421                }
1422                /* capture delay is by construction limited to one URB,
1423                 * reset delays here
1424                 */
1425                runtime->delay = subs->last_delay = 0;
1426
1427                /* realign last_frame_number */
1428                subs->last_frame_number = current_frame_number;
1429                subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1430
1431                spin_unlock_irqrestore(&subs->lock, flags);
1432                /* copy a data chunk */
1433                if (oldptr + bytes > runtime->buffer_size * stride) {
1434                        unsigned int bytes1 =
1435                                        runtime->buffer_size * stride - oldptr;
1436                        memcpy(runtime->dma_area + oldptr, cp, bytes1);
1437                        memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1438                } else {
1439                        memcpy(runtime->dma_area + oldptr, cp, bytes);
1440                }
1441        }
1442
1443        if (period_elapsed)
1444                snd_pcm_period_elapsed(subs->pcm_substream);
1445}
1446
1447static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1448                                             struct urb *urb, unsigned int bytes)
1449{
1450        struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1451        unsigned int stride = runtime->frame_bits >> 3;
1452        unsigned int dst_idx = 0;
1453        unsigned int src_idx = subs->hwptr_done;
1454        unsigned int wrap = runtime->buffer_size * stride;
1455        u8 *dst = urb->transfer_buffer;
1456        u8 *src = runtime->dma_area;
1457        u8 marker[] = { 0x05, 0xfa };
1458
1459        /*
1460         * The DSP DOP format defines a way to transport DSD samples over
1461         * normal PCM data endpoints. It requires stuffing of marker bytes
1462         * (0x05 and 0xfa, alternating per sample frame), and then expects
1463         * 2 additional bytes of actual payload. The whole frame is stored
1464         * LSB.
1465         *
1466         * Hence, for a stereo transport, the buffer layout looks like this,
1467         * where L refers to left channel samples and R to right.
1468         *
1469         *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1470         *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1471         *   .....
1472         *
1473         */
1474
1475        while (bytes--) {
1476                if (++subs->dsd_dop.byte_idx == 3) {
1477                        /* frame boundary? */
1478                        dst[dst_idx++] = marker[subs->dsd_dop.marker];
1479                        src_idx += 2;
1480                        subs->dsd_dop.byte_idx = 0;
1481
1482                        if (++subs->dsd_dop.channel % runtime->channels == 0) {
1483                                /* alternate the marker */
1484                                subs->dsd_dop.marker++;
1485                                subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1486                                subs->dsd_dop.channel = 0;
1487                        }
1488                } else {
1489                        /* stuff the DSD payload */
1490                        int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1491
1492                        if (subs->cur_audiofmt->dsd_bitrev)
1493                                dst[dst_idx++] = bitrev8(src[idx]);
1494                        else
1495                                dst[dst_idx++] = src[idx];
1496
1497                        subs->hwptr_done++;
1498                }
1499        }
1500        if (subs->hwptr_done >= runtime->buffer_size * stride)
1501                subs->hwptr_done -= runtime->buffer_size * stride;
1502}
1503
1504static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1505                        int offset, int stride, unsigned int bytes)
1506{
1507        struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1508
1509        if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1510                /* err, the transferred area goes over buffer boundary. */
1511                unsigned int bytes1 =
1512                        runtime->buffer_size * stride - subs->hwptr_done;
1513                memcpy(urb->transfer_buffer + offset,
1514                       runtime->dma_area + subs->hwptr_done, bytes1);
1515                memcpy(urb->transfer_buffer + offset + bytes1,
1516                       runtime->dma_area, bytes - bytes1);
1517        } else {
1518                memcpy(urb->transfer_buffer + offset,
1519                       runtime->dma_area + subs->hwptr_done, bytes);
1520        }
1521        subs->hwptr_done += bytes;
1522        if (subs->hwptr_done >= runtime->buffer_size * stride)
1523                subs->hwptr_done -= runtime->buffer_size * stride;
1524}
1525
1526static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1527                                      struct urb *urb, int stride,
1528                                      unsigned int bytes)
1529{
1530        __le32 packet_length;
1531        int i;
1532
1533        /* Put __le32 length descriptor at start of each packet. */
1534        for (i = 0; i < urb->number_of_packets; i++) {
1535                unsigned int length = urb->iso_frame_desc[i].length;
1536                unsigned int offset = urb->iso_frame_desc[i].offset;
1537
1538                packet_length = cpu_to_le32(length);
1539                offset += i * sizeof(packet_length);
1540                urb->iso_frame_desc[i].offset = offset;
1541                urb->iso_frame_desc[i].length += sizeof(packet_length);
1542                memcpy(urb->transfer_buffer + offset,
1543                       &packet_length, sizeof(packet_length));
1544                copy_to_urb(subs, urb, offset + sizeof(packet_length),
1545                            stride, length);
1546        }
1547        /* Adjust transfer size accordingly. */
1548        bytes += urb->number_of_packets * sizeof(packet_length);
1549        return bytes;
1550}
1551
1552static void prepare_playback_urb(struct snd_usb_substream *subs,
1553                                 struct urb *urb)
1554{
1555        struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1556        struct snd_usb_endpoint *ep = subs->data_endpoint;
1557        struct snd_urb_ctx *ctx = urb->context;
1558        unsigned int counts, frames, bytes;
1559        int i, stride, period_elapsed = 0;
1560        unsigned long flags;
1561
1562        stride = runtime->frame_bits >> 3;
1563
1564        frames = 0;
1565        urb->number_of_packets = 0;
1566        spin_lock_irqsave(&subs->lock, flags);
1567        subs->frame_limit += ep->max_urb_frames;
1568        for (i = 0; i < ctx->packets; i++) {
1569                if (ctx->packet_size[i])
1570                        counts = ctx->packet_size[i];
1571                else
1572                        counts = snd_usb_endpoint_next_packet_size(ep);
1573
1574                /* set up descriptor */
1575                urb->iso_frame_desc[i].offset = frames * ep->stride;
1576                urb->iso_frame_desc[i].length = counts * ep->stride;
1577                frames += counts;
1578                urb->number_of_packets++;
1579                subs->transfer_done += counts;
1580                if (subs->transfer_done >= runtime->period_size) {
1581                        subs->transfer_done -= runtime->period_size;
1582                        subs->frame_limit = 0;
1583                        period_elapsed = 1;
1584                        if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1585                                if (subs->transfer_done > 0) {
1586                                        /* FIXME: fill-max mode is not
1587                                         * supported yet */
1588                                        frames -= subs->transfer_done;
1589                                        counts -= subs->transfer_done;
1590                                        urb->iso_frame_desc[i].length =
1591                                                counts * ep->stride;
1592                                        subs->transfer_done = 0;
1593                                }
1594                                i++;
1595                                if (i < ctx->packets) {
1596                                        /* add a transfer delimiter */
1597                                        urb->iso_frame_desc[i].offset =
1598                                                frames * ep->stride;
1599                                        urb->iso_frame_desc[i].length = 0;
1600                                        urb->number_of_packets++;
1601                                }
1602                                break;
1603                        }
1604                }
1605                /* finish at the period boundary or after enough frames */
1606                if ((period_elapsed ||
1607                                subs->transfer_done >= subs->frame_limit) &&
1608                    !snd_usb_endpoint_implicit_feedback_sink(ep))
1609                        break;
1610        }
1611        bytes = frames * ep->stride;
1612
1613        if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1614                     subs->cur_audiofmt->dsd_dop)) {
1615                fill_playback_urb_dsd_dop(subs, urb, bytes);
1616        } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1617                           subs->cur_audiofmt->dsd_bitrev)) {
1618                /* bit-reverse the bytes */
1619                u8 *buf = urb->transfer_buffer;
1620                for (i = 0; i < bytes; i++) {
1621                        int idx = (subs->hwptr_done + i)
1622                                % (runtime->buffer_size * stride);
1623                        buf[i] = bitrev8(runtime->dma_area[idx]);
1624                }
1625
1626                subs->hwptr_done += bytes;
1627                if (subs->hwptr_done >= runtime->buffer_size * stride)
1628                        subs->hwptr_done -= runtime->buffer_size * stride;
1629        } else {
1630                /* usual PCM */
1631                if (!subs->tx_length_quirk)
1632                        copy_to_urb(subs, urb, 0, stride, bytes);
1633                else
1634                        bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1635                        /* bytes is now amount of outgoing data */
1636        }
1637
1638        /* update delay with exact number of samples queued */
1639        runtime->delay = subs->last_delay;
1640        runtime->delay += frames;
1641        subs->last_delay = runtime->delay;
1642
1643        /* realign last_frame_number */
1644        subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1645        subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1646
1647        if (subs->trigger_tstamp_pending_update) {
1648                /* this is the first actual URB submitted,
1649                 * update trigger timestamp to reflect actual start time
1650                 */
1651                snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1652                subs->trigger_tstamp_pending_update = false;
1653        }
1654
1655        spin_unlock_irqrestore(&subs->lock, flags);
1656        urb->transfer_buffer_length = bytes;
1657        if (period_elapsed)
1658                snd_pcm_period_elapsed(subs->pcm_substream);
1659}
1660
1661/*
1662 * process after playback data complete
1663 * - decrease the delay count again
1664 */
1665static void retire_playback_urb(struct snd_usb_substream *subs,
1666                               struct urb *urb)
1667{
1668        unsigned long flags;
1669        struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1670        struct snd_usb_endpoint *ep = subs->data_endpoint;
1671        int processed = urb->transfer_buffer_length / ep->stride;
1672        int est_delay;
1673
1674        /* ignore the delay accounting when procssed=0 is given, i.e.
1675         * silent payloads are procssed before handling the actual data
1676         */
1677        if (!processed)
1678                return;
1679
1680        spin_lock_irqsave(&subs->lock, flags);
1681        if (!subs->last_delay)
1682                goto out; /* short path */
1683
1684        est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1685        /* update delay with exact number of samples played */
1686        if (processed > subs->last_delay)
1687                subs->last_delay = 0;
1688        else
1689                subs->last_delay -= processed;
1690        runtime->delay = subs->last_delay;
1691
1692        /*
1693         * Report when delay estimate is off by more than 2ms.
1694         * The error should be lower than 2ms since the estimate relies
1695         * on two reads of a counter updated every ms.
1696         */
1697        if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1698                dev_dbg_ratelimited(&subs->dev->dev,
1699                        "delay: estimated %d, actual %d\n",
1700                        est_delay, subs->last_delay);
1701
1702        if (!subs->running) {
1703                /* update last_frame_number for delay counting here since
1704                 * prepare_playback_urb won't be called during pause
1705                 */
1706                subs->last_frame_number =
1707                        usb_get_current_frame_number(subs->dev) & 0xff;
1708        }
1709
1710 out:
1711        spin_unlock_irqrestore(&subs->lock, flags);
1712}
1713
1714static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1715                                              int cmd)
1716{
1717        struct snd_usb_substream *subs = substream->runtime->private_data;
1718
1719        switch (cmd) {
1720        case SNDRV_PCM_TRIGGER_START:
1721                subs->trigger_tstamp_pending_update = true;
1722                /* fall through */
1723        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1724                subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1725                subs->data_endpoint->retire_data_urb = retire_playback_urb;
1726                subs->running = 1;
1727                return 0;
1728        case SNDRV_PCM_TRIGGER_STOP:
1729                stop_endpoints(subs, false);
1730                subs->running = 0;
1731                return 0;
1732        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1733                subs->data_endpoint->prepare_data_urb = NULL;
1734                /* keep retire_data_urb for delay calculation */
1735                subs->data_endpoint->retire_data_urb = retire_playback_urb;
1736                subs->running = 0;
1737                return 0;
1738        }
1739
1740        return -EINVAL;
1741}
1742
1743static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1744                                             int cmd)
1745{
1746        int err;
1747        struct snd_usb_substream *subs = substream->runtime->private_data;
1748
1749        switch (cmd) {
1750        case SNDRV_PCM_TRIGGER_START:
1751                err = start_endpoints(subs);
1752                if (err < 0)
1753                        return err;
1754
1755                subs->data_endpoint->retire_data_urb = retire_capture_urb;
1756                subs->running = 1;
1757                return 0;
1758        case SNDRV_PCM_TRIGGER_STOP:
1759                stop_endpoints(subs, false);
1760                subs->running = 0;
1761                return 0;
1762        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1763                subs->data_endpoint->retire_data_urb = NULL;
1764                subs->running = 0;
1765                return 0;
1766        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1767                subs->data_endpoint->retire_data_urb = retire_capture_urb;
1768                subs->running = 1;
1769                return 0;
1770        }
1771
1772        return -EINVAL;
1773}
1774
1775static const struct snd_pcm_ops snd_usb_playback_ops = {
1776        .open =         snd_usb_pcm_open,
1777        .close =        snd_usb_pcm_close,
1778        .ioctl =        snd_pcm_lib_ioctl,
1779        .hw_params =    snd_usb_hw_params,
1780        .hw_free =      snd_usb_hw_free,
1781        .prepare =      snd_usb_pcm_prepare,
1782        .trigger =      snd_usb_substream_playback_trigger,
1783        .pointer =      snd_usb_pcm_pointer,
1784        .page =         snd_pcm_lib_get_vmalloc_page,
1785};
1786
1787static const struct snd_pcm_ops snd_usb_capture_ops = {
1788        .open =         snd_usb_pcm_open,
1789        .close =        snd_usb_pcm_close,
1790        .ioctl =        snd_pcm_lib_ioctl,
1791        .hw_params =    snd_usb_hw_params,
1792        .hw_free =      snd_usb_hw_free,
1793        .prepare =      snd_usb_pcm_prepare,
1794        .trigger =      snd_usb_substream_capture_trigger,
1795        .pointer =      snd_usb_pcm_pointer,
1796        .page =         snd_pcm_lib_get_vmalloc_page,
1797};
1798
1799static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1800        .open =         snd_usb_pcm_open,
1801        .close =        snd_usb_pcm_close,
1802        .ioctl =        snd_pcm_lib_ioctl,
1803        .hw_params =    snd_usb_hw_params,
1804        .hw_free =      snd_usb_hw_free,
1805        .prepare =      snd_usb_pcm_prepare,
1806        .trigger =      snd_usb_substream_playback_trigger,
1807        .pointer =      snd_usb_pcm_pointer,
1808        .page =         snd_pcm_sgbuf_ops_page,
1809};
1810
1811static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1812        .open =         snd_usb_pcm_open,
1813        .close =        snd_usb_pcm_close,
1814        .ioctl =        snd_pcm_lib_ioctl,
1815        .hw_params =    snd_usb_hw_params,
1816        .hw_free =      snd_usb_hw_free,
1817        .prepare =      snd_usb_pcm_prepare,
1818        .trigger =      snd_usb_substream_capture_trigger,
1819        .pointer =      snd_usb_pcm_pointer,
1820        .page =         snd_pcm_sgbuf_ops_page,
1821};
1822
1823void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1824{
1825        const struct snd_pcm_ops *ops;
1826
1827        if (snd_usb_use_vmalloc)
1828                ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1829                        &snd_usb_playback_ops : &snd_usb_capture_ops;
1830        else
1831                ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1832                        &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1833        snd_pcm_set_ops(pcm, stream, ops);
1834}
1835
1836void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1837{
1838        struct snd_pcm *pcm = subs->stream->pcm;
1839        struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1840        struct device *dev = subs->dev->bus->controller;
1841
1842        if (!snd_usb_use_vmalloc)
1843                snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1844                                              dev, 64*1024, 512*1024);
1845}
1846