sound/usb/pcm.c

   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 "endpoint.h"
  21 #include "helper.h"
  22 #include "pcm.h"
  23 #include "clock.h"
  24 #include "power.h"
  25 #include "media.h"
  26 #include "implicit.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 */
  32 static snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33                                            struct snd_pcm_runtime *runtime)
  34 {
  35         unsigned int current_frame_number;
  36         unsigned int frame_diff;
  37         int est_delay;
  38         int queued;
  39
  40         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
  41                 queued = bytes_to_frames(runtime, subs->inflight_bytes);
  42                 if (!queued)
  43                         return 0;
  44         } else if (!subs->running) {
  45                 return 0;
  46         }
  47
  48         current_frame_number = usb_get_current_frame_number(subs->dev);
  49         /*
  50          * HCD implementations use different widths, use lower 8 bits.
  51          * The delay will be managed up to 256ms, which is more than
  52          * enough
  53          */
  54         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  55
  56         /* Approximation based on number of samples per USB frame (ms),
  57            some truncation for 44.1 but the estimate is good enough */
  58         est_delay = frame_diff * runtime->rate / 1000;
  59
  60         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
  61                 est_delay = queued - est_delay;
  62                 if (est_delay < 0)
  63                         est_delay = 0;
  64         }
  65
  66         return est_delay;
  67 }
  68
  69 /*
  70  * return the current pcm pointer.  just based on the hwptr_done value.
  71  */
  72 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  73 {
  74         struct snd_pcm_runtime *runtime = substream->runtime;
  75         struct snd_usb_substream *subs = runtime->private_data;
  76         unsigned int hwptr_done;
  77
  78         if (atomic_read(&subs->stream->chip->shutdown))
  79                 return SNDRV_PCM_POS_XRUN;
  80         spin_lock(&subs->lock);
  81         hwptr_done = subs->hwptr_done;
  82         runtime->delay = snd_usb_pcm_delay(subs, runtime);
  83         spin_unlock(&subs->lock);
  84         return bytes_to_frames(runtime, hwptr_done);
  85 }
  86
  87 /*
  88  * find a matching audio format
  89  */
  90 static const struct audioformat *
  91 find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
  92             unsigned int rate, unsigned int channels, bool strict_match,
  93             struct snd_usb_substream *subs)
  94 {
  95         const struct audioformat *fp;
  96         const struct audioformat *found = NULL;
  97         int cur_attr = 0, attr;
  98
  99         list_for_each_entry(fp, fmt_list_head, list) {
 100                 if (strict_match) {
 101                         if (!(fp->formats & pcm_format_to_bits(format)))
 102                                 continue;
 103                         if (fp->channels != channels)
 104                                 continue;
 105                 }
 106                 if (rate < fp->rate_min || rate > fp->rate_max)
 107                         continue;
 108                 if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 109                         unsigned int i;
 110                         for (i = 0; i < fp->nr_rates; i++)
 111                                 if (fp->rate_table[i] == rate)
 112                                         break;
 113                         if (i >= fp->nr_rates)
 114                                 continue;
 115                 }
 116                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 117                 if (!found) {
 118                         found = fp;
 119                         cur_attr = attr;
 120                         continue;
 121                 }
 122                 /* avoid async out and adaptive in if the other method
 123                  * supports the same format.
 124                  * this is a workaround for the case like
 125                  * M-audio audiophile USB.
 126                  */
 127                 if (subs && attr != cur_attr) {
 128                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 129                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 130                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 131                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 132                                 continue;
 133                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 134                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 135                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 136                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 137                                 found = fp;
 138                                 cur_attr = attr;
 139                                 continue;
 140                         }
 141                 }
 142                 /* find the format with the largest max. packet size */
 143                 if (fp->maxpacksize > found->maxpacksize) {
 144                         found = fp;
 145                         cur_attr = attr;
 146                 }
 147         }
 148         return found;
 149 }
 150
 151 static const struct audioformat *
 152 find_substream_format(struct snd_usb_substream *subs,
 153                       const struct snd_pcm_hw_params *params)
 154 {
 155         return find_format(&subs->fmt_list, params_format(params),
 156                            params_rate(params), params_channels(params),
 157                            true, subs);
 158 }
 159
 160 static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
 161 {
 162         struct usb_device *dev = chip->dev;
 163         unsigned char data[1];
 164         int err;
 165
 166         data[0] = 1;
 167         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 168                               USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 169                               UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 170                               data, sizeof(data));
 171         return err;
 172 }
 173
 174 static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
 175 {
 176         struct usb_device *dev = chip->dev;
 177         unsigned char data[1];
 178         int err;
 179
 180         data[0] = 1;
 181         err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 182                               USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 183                               UAC2_EP_CS_PITCH << 8, 0,
 184                               data, sizeof(data));
 185         return err;
 186 }
 187
 188 /*
 189  * initialize the pitch control and sample rate
 190  */
 191 int snd_usb_init_pitch(struct snd_usb_audio *chip,
 192                        const struct audioformat *fmt)
 193 {
 194         int err;
 195
 196         /* if endpoint doesn't have pitch control, bail out */
 197         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 198                 return 0;
 199
 200         usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
 201
 202         switch (fmt->protocol) {
 203         case UAC_VERSION_1:
 204                 err = init_pitch_v1(chip, fmt->endpoint);
 205                 break;
 206         case UAC_VERSION_2:
 207                 err = init_pitch_v2(chip, fmt->endpoint);
 208                 break;
 209         default:
 210                 return 0;
 211         }
 212
 213         if (err < 0) {
 214                 usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
 215                               fmt->endpoint);
 216                 return err;
 217         }
 218
 219         return 0;
 220 }
 221
 222 static bool stop_endpoints(struct snd_usb_substream *subs)
 223 {
 224         bool stopped = 0;
 225
 226         if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 227                 snd_usb_endpoint_stop(subs->sync_endpoint);
 228                 stopped = true;
 229         }
 230         if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 231                 snd_usb_endpoint_stop(subs->data_endpoint);
 232                 stopped = true;
 233         }
 234         return stopped;
 235 }
 236
 237 static int start_endpoints(struct snd_usb_substream *subs)
 238 {
 239         int err;
 240
 241         if (!subs->data_endpoint)
 242                 return -EINVAL;
 243
 244         if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 245                 err = snd_usb_endpoint_start(subs->data_endpoint);
 246                 if (err < 0) {
 247                         clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 248                         goto error;
 249                 }
 250         }
 251
 252         if (subs->sync_endpoint &&
 253             !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 254                 err = snd_usb_endpoint_start(subs->sync_endpoint);
 255                 if (err < 0) {
 256                         clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 257                         goto error;
 258                 }
 259         }
 260
 261         return 0;
 262
 263  error:
 264         stop_endpoints(subs);
 265         return err;
 266 }
 267
 268 static void sync_pending_stops(struct snd_usb_substream *subs)
 269 {
 270         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 271         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 272 }
 273
 274 /* PCM sync_stop callback */
 275 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 276 {
 277         struct snd_usb_substream *subs = substream->runtime->private_data;
 278
 279         sync_pending_stops(subs);
 280         return 0;
 281 }
 282
 283 /* Set up sync endpoint */
 284 int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
 285                                     struct audioformat *fmt)
 286 {
 287         struct usb_device *dev = chip->dev;
 288         struct usb_host_interface *alts;
 289         struct usb_interface_descriptor *altsd;
 290         unsigned int ep, attr, sync_attr;
 291         bool is_playback;
 292         int err;
 293
 294         alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
 295         if (!alts)
 296                 return 0;
 297         altsd = get_iface_desc(alts);
 298
 299         err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
 300         if (err > 0)
 301                 return 0; /* matched */
 302
 303         /*
 304          * Generic sync EP handling
 305          */
 306
 307         if (altsd->bNumEndpoints < 2)
 308                 return 0;
 309
 310         is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
 311         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 312         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 313                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 314             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 315                 return 0;
 316
 317         sync_attr = get_endpoint(alts, 1)->bmAttributes;
 318
 319         /*
 320          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 321          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 322          * error fall back to SYNC mode and don't create sync endpoint
 323          */
 324
 325         /* check sync-pipe endpoint */
 326         /* ... and check descriptor size before accessing bSynchAddress
 327            because there is a version of the SB Audigy 2 NX firmware lacking
 328            the audio fields in the endpoint descriptors */
 329         if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 330             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 331              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 332                 dev_err(&dev->dev,
 333                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 334                            fmt->iface, fmt->altsetting,
 335                            get_endpoint(alts, 1)->bmAttributes,
 336                            get_endpoint(alts, 1)->bLength,
 337                            get_endpoint(alts, 1)->bSynchAddress);
 338                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 339                         return 0;
 340                 return -EINVAL;
 341         }
 342         ep = get_endpoint(alts, 1)->bEndpointAddress;
 343         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 344             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 345             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 346              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 347                 dev_err(&dev->dev,
 348                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 349                            fmt->iface, fmt->altsetting,
 350                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 351                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 352                         return 0;
 353                 return -EINVAL;
 354         }
 355
 356         fmt->sync_ep = ep;
 357         fmt->sync_iface = altsd->bInterfaceNumber;
 358         fmt->sync_altsetting = altsd->bAlternateSetting;
 359         fmt->sync_ep_idx = 1;
 360         if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
 361                 fmt->implicit_fb = 1;
 362
 363         dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
 364                 fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
 365                 fmt->sync_altsetting, fmt->implicit_fb);
 366
 367         return 0;
 368 }
 369
 370 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 371 {
 372         int ret;
 373
 374         if (!subs->str_pd)
 375                 return 0;
 376
 377         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 378         if (ret < 0) {
 379                 dev_err(&subs->dev->dev,
 380                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 381                         subs->str_pd->pd_id, state, ret);
 382                 return ret;
 383         }
 384
 385         return 0;
 386 }
 387
 388 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 389 {
 390         int ret;
 391
 392         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 393         if (ret < 0)
 394                 return ret;
 395
 396         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 397         if (ret < 0)
 398                 return ret;
 399
 400         return 0;
 401 }
 402
 403 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 404 {
 405         int ret;
 406
 407         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 408         if (ret < 0)
 409                 return ret;
 410
 411         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 412         if (ret < 0)
 413                 return ret;
 414
 415         return 0;
 416 }
 417
 418 static void close_endpoints(struct snd_usb_audio *chip,
 419                             struct snd_usb_substream *subs)
 420 {
 421         if (subs->data_endpoint) {
 422                 snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
 423                 snd_usb_endpoint_close(chip, subs->data_endpoint);
 424                 subs->data_endpoint = NULL;
 425         }
 426
 427         if (subs->sync_endpoint) {
 428                 snd_usb_endpoint_close(chip, subs->sync_endpoint);
 429                 subs->sync_endpoint = NULL;
 430         }
 431 }
 432
 433 static int configure_endpoints(struct snd_usb_audio *chip,
 434                                struct snd_usb_substream *subs)
 435 {
 436         int err;
 437
 438         if (subs->data_endpoint->need_setup) {
 439                 /* stop any running stream beforehand */
 440                 if (stop_endpoints(subs))
 441                         sync_pending_stops(subs);
 442                 err = snd_usb_endpoint_configure(chip, subs->data_endpoint);
 443                 if (err < 0)
 444                         return err;
 445                 snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
 446         }
 447
 448         if (subs->sync_endpoint) {
 449                 err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
 450                 if (err < 0)
 451                         return err;
 452         }
 453
 454         return 0;
 455 }
 456
 457 /*
 458  * hw_params callback
 459  *
 460  * allocate a buffer and set the given audio format.
 461  *
 462  * so far we use a physically linear buffer although packetize transfer
 463  * doesn't need a continuous area.
 464  * if sg buffer is supported on the later version of alsa, we'll follow
 465  * that.
 466  */
 467 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 468                              struct snd_pcm_hw_params *hw_params)
 469 {
 470         struct snd_usb_substream *subs = substream->runtime->private_data;
 471         struct snd_usb_audio *chip = subs->stream->chip;
 472         const struct audioformat *fmt;
 473         const struct audioformat *sync_fmt;
 474         int ret;
 475
 476         ret = snd_media_start_pipeline(subs);
 477         if (ret)
 478                 return ret;
 479
 480         fmt = find_substream_format(subs, hw_params);
 481         if (!fmt) {
 482                 usb_audio_dbg(chip,
 483                               "cannot find format: format=%s, rate=%d, channels=%d\n",
 484                               snd_pcm_format_name(params_format(hw_params)),
 485                               params_rate(hw_params), params_channels(hw_params));
 486                 ret = -EINVAL;
 487                 goto stop_pipeline;
 488         }
 489
 490         if (fmt->implicit_fb) {
 491                 sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
 492                                                                 hw_params,
 493                                                                 !substream->stream);
 494                 if (!sync_fmt) {
 495                         usb_audio_dbg(chip,
 496                                       "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
 497                                       fmt->sync_ep, fmt->sync_iface,
 498                                       fmt->sync_altsetting,
 499                                       snd_pcm_format_name(params_format(hw_params)),
 500                                       params_rate(hw_params), params_channels(hw_params));
 501                         ret = -EINVAL;
 502                         goto stop_pipeline;
 503                 }
 504         } else {
 505                 sync_fmt = fmt;
 506         }
 507
 508         ret = snd_usb_lock_shutdown(chip);
 509         if (ret < 0)
 510                 goto stop_pipeline;
 511
 512         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 513         if (ret < 0)
 514                 goto unlock;
 515
 516         if (subs->data_endpoint) {
 517                 if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
 518                                                 fmt, hw_params))
 519                         goto unlock;
 520                 close_endpoints(chip, subs);
 521         }
 522
 523         subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false);
 524         if (!subs->data_endpoint) {
 525                 ret = -EINVAL;
 526                 goto unlock;
 527         }
 528
 529         if (fmt->sync_ep) {
 530                 subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
 531                                                             hw_params,
 532                                                             fmt == sync_fmt);
 533                 if (!subs->sync_endpoint) {
 534                         ret = -EINVAL;
 535                         goto unlock;
 536                 }
 537
 538                 snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
 539                                           subs->sync_endpoint);
 540         }
 541
 542         mutex_lock(&chip->mutex);
 543         subs->cur_audiofmt = fmt;
 544         mutex_unlock(&chip->mutex);
 545
 546         ret = configure_endpoints(chip, subs);
 547
 548  unlock:
 549         if (ret < 0)
 550                 close_endpoints(chip, subs);
 551
 552         snd_usb_unlock_shutdown(chip);
 553  stop_pipeline:
 554         if (ret < 0)
 555                 snd_media_stop_pipeline(subs);
 556
 557         return ret;
 558 }
 559
 560 /*
 561  * hw_free callback
 562  *
 563  * reset the audio format and release the buffer
 564  */
 565 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 566 {
 567         struct snd_usb_substream *subs = substream->runtime->private_data;
 568         struct snd_usb_audio *chip = subs->stream->chip;
 569
 570         snd_media_stop_pipeline(subs);
 571         mutex_lock(&chip->mutex);
 572         subs->cur_audiofmt = NULL;
 573         mutex_unlock(&chip->mutex);
 574         if (!snd_usb_lock_shutdown(chip)) {
 575                 if (stop_endpoints(subs))
 576                         sync_pending_stops(subs);
 577                 close_endpoints(chip, subs);
 578                 snd_usb_unlock_shutdown(chip);
 579         }
 580
 581         return 0;
 582 }
 583
 584 /*
 585  * prepare callback
 586  *
 587  * only a few subtle things...
 588  */
 589 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 590 {
 591         struct snd_pcm_runtime *runtime = substream->runtime;
 592         struct snd_usb_substream *subs = runtime->private_data;
 593         struct snd_usb_audio *chip = subs->stream->chip;
 594         int ret;
 595
 596         ret = snd_usb_lock_shutdown(chip);
 597         if (ret < 0)
 598                 return ret;
 599         if (snd_BUG_ON(!subs->data_endpoint)) {
 600                 ret = -EIO;
 601                 goto unlock;
 602         }
 603
 604         ret = configure_endpoints(chip, subs);
 605         if (ret < 0)
 606                 goto unlock;
 607
 608         /* reset the pointer */
 609         subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
 610         subs->inflight_bytes = 0;
 611         subs->hwptr_done = 0;
 612         subs->transfer_done = 0;
 613         subs->last_frame_number = 0;
 614         runtime->delay = 0;
 615
 616  unlock:
 617         snd_usb_unlock_shutdown(chip);
 618         return ret;
 619 }
 620
 621 /*
 622  * h/w constraints
 623  */
 624
 625 #ifdef HW_CONST_DEBUG
 626 #define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
 627 #else
 628 #define hwc_debug(fmt, args...) do { } while(0)
 629 #endif
 630
 631 static const struct snd_pcm_hardware snd_usb_hardware =
 632 {
 633         .info =                 SNDRV_PCM_INFO_MMAP |
 634                                 SNDRV_PCM_INFO_MMAP_VALID |
 635                                 SNDRV_PCM_INFO_BATCH |
 636                                 SNDRV_PCM_INFO_INTERLEAVED |
 637                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 638                                 SNDRV_PCM_INFO_PAUSE,
 639         .channels_min =         1,
 640         .channels_max =         256,
 641         .buffer_bytes_max =     1024 * 1024,
 642         .period_bytes_min =     64,
 643         .period_bytes_max =     512 * 1024,
 644         .periods_min =          2,
 645         .periods_max =          1024,
 646 };
 647
 648 static int hw_check_valid_format(struct snd_usb_substream *subs,
 649                                  struct snd_pcm_hw_params *params,
 650                                  const struct audioformat *fp)
 651 {
 652         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 653         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 654         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 655         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 656         struct snd_mask check_fmts;
 657         unsigned int ptime;
 658
 659         /* check the format */
 660         snd_mask_none(&check_fmts);
 661         check_fmts.bits[0] = (u32)fp->formats;
 662         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 663         snd_mask_intersect(&check_fmts, fmts);
 664         if (snd_mask_empty(&check_fmts)) {
 665                 hwc_debug("   > check: no supported format 0x%llx\n", fp->formats);
 666                 return 0;
 667         }
 668         /* check the channels */
 669         if (fp->channels < ct->min || fp->channels > ct->max) {
 670                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 671                 return 0;
 672         }
 673         /* check the rate is within the range */
 674         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 675                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 676                 return 0;
 677         }
 678         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 679                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 680                 return 0;
 681         }
 682         /* check whether the period time is >= the data packet interval */
 683         if (subs->speed != USB_SPEED_FULL) {
 684                 ptime = 125 * (1 << fp->datainterval);
 685                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 686                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 687                         return 0;
 688                 }
 689         }
 690         return 1;
 691 }
 692
 693 static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
 694                                   unsigned int rmax)
 695 {
 696         int changed;
 697
 698         if (rmin > rmax) {
 699                 hwc_debug("  --> get empty\n");
 700                 it->empty = 1;
 701                 return -EINVAL;
 702         }
 703
 704         changed = 0;
 705         if (it->min < rmin) {
 706                 it->min = rmin;
 707                 it->openmin = 0;
 708                 changed = 1;
 709         }
 710         if (it->max > rmax) {
 711                 it->max = rmax;
 712                 it->openmax = 0;
 713                 changed = 1;
 714         }
 715         if (snd_interval_checkempty(it)) {
 716                 it->empty = 1;
 717                 return -EINVAL;
 718         }
 719         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 720         return changed;
 721 }
 722
 723 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 724                         struct snd_pcm_hw_rule *rule)
 725 {
 726         struct snd_usb_substream *subs = rule->private;
 727         const struct audioformat *fp;
 728         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 729         unsigned int rmin, rmax, r;
 730         int i;
 731
 732         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 733         rmin = UINT_MAX;
 734         rmax = 0;
 735         list_for_each_entry(fp, &subs->fmt_list, list) {
 736                 if (!hw_check_valid_format(subs, params, fp))
 737                         continue;
 738                 if (fp->rate_table && fp->nr_rates) {
 739                         for (i = 0; i < fp->nr_rates; i++) {
 740                                 r = fp->rate_table[i];
 741                                 if (!snd_interval_test(it, r))
 742                                         continue;
 743                                 rmin = min(rmin, r);
 744                                 rmax = max(rmax, r);
 745                         }
 746                 } else {
 747                         rmin = min(rmin, fp->rate_min);
 748                         rmax = max(rmax, fp->rate_max);
 749                 }
 750         }
 751
 752         return apply_hw_params_minmax(it, rmin, rmax);
 753 }
 754
 755
 756 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 757                             struct snd_pcm_hw_rule *rule)
 758 {
 759         struct snd_usb_substream *subs = rule->private;
 760         const struct audioformat *fp;
 761         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 762         unsigned int rmin, rmax;
 763
 764         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 765         rmin = UINT_MAX;
 766         rmax = 0;
 767         list_for_each_entry(fp, &subs->fmt_list, list) {
 768                 if (!hw_check_valid_format(subs, params, fp))
 769                         continue;
 770                 rmin = min(rmin, fp->channels);
 771                 rmax = max(rmax, fp->channels);
 772         }
 773
 774         return apply_hw_params_minmax(it, rmin, rmax);
 775 }
 776
 777 static int apply_hw_params_format_bits(struct snd_mask *fmt, u64 fbits)
 778 {
 779         u32 oldbits[2];
 780         int changed;
 781
 782         oldbits[0] = fmt->bits[0];
 783         oldbits[1] = fmt->bits[1];
 784         fmt->bits[0] &= (u32)fbits;
 785         fmt->bits[1] &= (u32)(fbits >> 32);
 786         if (!fmt->bits[0] && !fmt->bits[1]) {
 787                 hwc_debug("  --> get empty\n");
 788                 return -EINVAL;
 789         }
 790         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 791         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 792         return changed;
 793 }
 794
 795 static int hw_rule_format(struct snd_pcm_hw_params *params,
 796                           struct snd_pcm_hw_rule *rule)
 797 {
 798         struct snd_usb_substream *subs = rule->private;
 799         const struct audioformat *fp;
 800         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 801         u64 fbits;
 802
 803         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 804         fbits = 0;
 805         list_for_each_entry(fp, &subs->fmt_list, list) {
 806                 if (!hw_check_valid_format(subs, params, fp))
 807                         continue;
 808                 fbits |= fp->formats;
 809         }
 810         return apply_hw_params_format_bits(fmt, fbits);
 811 }
 812
 813 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 814                                struct snd_pcm_hw_rule *rule)
 815 {
 816         struct snd_usb_substream *subs = rule->private;
 817         const struct audioformat *fp;
 818         struct snd_interval *it;
 819         unsigned char min_datainterval;
 820         unsigned int pmin;
 821
 822         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 823         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 824         min_datainterval = 0xff;
 825         list_for_each_entry(fp, &subs->fmt_list, list) {
 826                 if (!hw_check_valid_format(subs, params, fp))
 827                         continue;
 828                 min_datainterval = min(min_datainterval, fp->datainterval);
 829         }
 830         if (min_datainterval == 0xff) {
 831                 hwc_debug("  --> get empty\n");
 832                 it->empty = 1;
 833                 return -EINVAL;
 834         }
 835         pmin = 125 * (1 << min_datainterval);
 836
 837         return apply_hw_params_minmax(it, pmin, UINT_MAX);
 838 }
 839
 840 /* get the EP or the sync EP for implicit fb when it's already set up */
 841 static const struct snd_usb_endpoint *
 842 get_sync_ep_from_substream(struct snd_usb_substream *subs)
 843 {
 844         struct snd_usb_audio *chip = subs->stream->chip;
 845         const struct audioformat *fp;
 846         const struct snd_usb_endpoint *ep;
 847
 848         list_for_each_entry(fp, &subs->fmt_list, list) {
 849                 ep = snd_usb_get_endpoint(chip, fp->endpoint);
 850                 if (ep && ep->cur_audiofmt) {
 851                         /* if EP is already opened solely for this substream,
 852                          * we still allow us to change the parameter; otherwise
 853                          * this substream has to follow the existing parameter
 854                          */
 855                         if (ep->cur_audiofmt != subs->cur_audiofmt || ep->opened > 1)
 856                                 return ep;
 857                 }
 858                 if (!fp->implicit_fb)
 859                         continue;
 860                 /* for the implicit fb, check the sync ep as well */
 861                 ep = snd_usb_get_endpoint(chip, fp->sync_ep);
 862                 if (ep && ep->cur_audiofmt)
 863                         return ep;
 864         }
 865         return NULL;
 866 }
 867
 868 /* additional hw constraints for implicit feedback mode */
 869 static int hw_rule_format_implicit_fb(struct snd_pcm_hw_params *params,
 870                                       struct snd_pcm_hw_rule *rule)
 871 {
 872         struct snd_usb_substream *subs = rule->private;
 873         const struct snd_usb_endpoint *ep;
 874         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 875
 876         ep = get_sync_ep_from_substream(subs);
 877         if (!ep)
 878                 return 0;
 879
 880         hwc_debug("applying %s\n", __func__);
 881         return apply_hw_params_format_bits(fmt, pcm_format_to_bits(ep->cur_format));
 882 }
 883
 884 static int hw_rule_rate_implicit_fb(struct snd_pcm_hw_params *params,
 885                                     struct snd_pcm_hw_rule *rule)
 886 {
 887         struct snd_usb_substream *subs = rule->private;
 888         const struct snd_usb_endpoint *ep;
 889         struct snd_interval *it;
 890
 891         ep = get_sync_ep_from_substream(subs);
 892         if (!ep)
 893                 return 0;
 894
 895         hwc_debug("applying %s\n", __func__);
 896         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 897         return apply_hw_params_minmax(it, ep->cur_rate, ep->cur_rate);
 898 }
 899
 900 static int hw_rule_period_size_implicit_fb(struct snd_pcm_hw_params *params,
 901                                            struct snd_pcm_hw_rule *rule)
 902 {
 903         struct snd_usb_substream *subs = rule->private;
 904         const struct snd_usb_endpoint *ep;
 905         struct snd_interval *it;
 906
 907         ep = get_sync_ep_from_substream(subs);
 908         if (!ep)
 909                 return 0;
 910
 911         hwc_debug("applying %s\n", __func__);
 912         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
 913         return apply_hw_params_minmax(it, ep->cur_period_frames,
 914                                       ep->cur_period_frames);
 915 }
 916
 917 static int hw_rule_periods_implicit_fb(struct snd_pcm_hw_params *params,
 918                                        struct snd_pcm_hw_rule *rule)
 919 {
 920         struct snd_usb_substream *subs = rule->private;
 921         const struct snd_usb_endpoint *ep;
 922         struct snd_interval *it;
 923
 924         ep = get_sync_ep_from_substream(subs);
 925         if (!ep)
 926                 return 0;
 927
 928         hwc_debug("applying %s\n", __func__);
 929         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIODS);
 930         return apply_hw_params_minmax(it, ep->cur_buffer_periods,
 931                                       ep->cur_buffer_periods);
 932 }
 933
 934 /*
 935  * set up the runtime hardware information.
 936  */
 937
 938 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 939 {
 940         const struct audioformat *fp;
 941         unsigned int pt, ptmin;
 942         int param_period_time_if_needed = -1;
 943         int err;
 944
 945         runtime->hw.formats = subs->formats;
 946
 947         runtime->hw.rate_min = 0x7fffffff;
 948         runtime->hw.rate_max = 0;
 949         runtime->hw.channels_min = 256;
 950         runtime->hw.channels_max = 0;
 951         runtime->hw.rates = 0;
 952         ptmin = UINT_MAX;
 953         /* check min/max rates and channels */
 954         list_for_each_entry(fp, &subs->fmt_list, list) {
 955                 runtime->hw.rates |= fp->rates;
 956                 if (runtime->hw.rate_min > fp->rate_min)
 957                         runtime->hw.rate_min = fp->rate_min;
 958                 if (runtime->hw.rate_max < fp->rate_max)
 959                         runtime->hw.rate_max = fp->rate_max;
 960                 if (runtime->hw.channels_min > fp->channels)
 961                         runtime->hw.channels_min = fp->channels;
 962                 if (runtime->hw.channels_max < fp->channels)
 963                         runtime->hw.channels_max = fp->channels;
 964                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 965                         /* FIXME: there might be more than one audio formats... */
 966                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 967                                 fp->frame_size;
 968                 }
 969                 pt = 125 * (1 << fp->datainterval);
 970                 ptmin = min(ptmin, pt);
 971         }
 972
 973         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 974         if (subs->speed == USB_SPEED_FULL)
 975                 /* full speed devices have fixed data packet interval */
 976                 ptmin = 1000;
 977         if (ptmin == 1000)
 978                 /* if period time doesn't go below 1 ms, no rules needed */
 979                 param_period_time_if_needed = -1;
 980
 981         err = snd_pcm_hw_constraint_minmax(runtime,
 982                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 983                                            ptmin, UINT_MAX);
 984         if (err < 0)
 985                 return err;
 986
 987         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 988                                   hw_rule_rate, subs,
 989                                   SNDRV_PCM_HW_PARAM_RATE,
 990                                   SNDRV_PCM_HW_PARAM_FORMAT,
 991                                   SNDRV_PCM_HW_PARAM_CHANNELS,
 992                                   param_period_time_if_needed,
 993                                   -1);
 994         if (err < 0)
 995                 return err;
 996
 997         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 998                                   hw_rule_channels, subs,
 999                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1000                                   SNDRV_PCM_HW_PARAM_FORMAT,
1001                                   SNDRV_PCM_HW_PARAM_RATE,
1002                                   param_period_time_if_needed,
1003                                   -1);
1004         if (err < 0)
1005                 return err;
1006         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1007                                   hw_rule_format, subs,
1008                                   SNDRV_PCM_HW_PARAM_FORMAT,
1009                                   SNDRV_PCM_HW_PARAM_RATE,
1010                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1011                                   param_period_time_if_needed,
1012                                   -1);
1013         if (err < 0)
1014                 return err;
1015         if (param_period_time_if_needed >= 0) {
1016                 err = snd_pcm_hw_rule_add(runtime, 0,
1017                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1018                                           hw_rule_period_time, subs,
1019                                           SNDRV_PCM_HW_PARAM_FORMAT,
1020                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1021                                           SNDRV_PCM_HW_PARAM_RATE,
1022                                           -1);
1023                 if (err < 0)
1024                         return err;
1025         }
1026
1027         /* additional hw constraints for implicit fb */
1028         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1029                                   hw_rule_format_implicit_fb, subs,
1030                                   SNDRV_PCM_HW_PARAM_FORMAT, -1);
1031         if (err < 0)
1032                 return err;
1033         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1034                                   hw_rule_rate_implicit_fb, subs,
1035                                   SNDRV_PCM_HW_PARAM_RATE, -1);
1036         if (err < 0)
1037                 return err;
1038         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1039                                   hw_rule_period_size_implicit_fb, subs,
1040                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1041         if (err < 0)
1042                 return err;
1043         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1044                                   hw_rule_periods_implicit_fb, subs,
1045                                   SNDRV_PCM_HW_PARAM_PERIODS, -1);
1046         if (err < 0)
1047                 return err;
1048
1049         return 0;
1050 }
1051
1052 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1053 {
1054         int direction = substream->stream;
1055         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1056         struct snd_pcm_runtime *runtime = substream->runtime;
1057         struct snd_usb_substream *subs = &as->substream[direction];
1058         int ret;
1059
1060         runtime->hw = snd_usb_hardware;
1061         runtime->private_data = subs;
1062         subs->pcm_substream = substream;
1063         /* runtime PM is also done there */
1064
1065         /* initialize DSD/DOP context */
1066         subs->dsd_dop.byte_idx = 0;
1067         subs->dsd_dop.channel = 0;
1068         subs->dsd_dop.marker = 1;
1069
1070         ret = setup_hw_info(runtime, subs);
1071         if (ret < 0)
1072                 return ret;
1073         ret = snd_usb_autoresume(subs->stream->chip);
1074         if (ret < 0)
1075                 return ret;
1076         ret = snd_media_stream_init(subs, as->pcm, direction);
1077         if (ret < 0)
1078                 snd_usb_autosuspend(subs->stream->chip);
1079         return ret;
1080 }
1081
1082 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1083 {
1084         int direction = substream->stream;
1085         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1086         struct snd_usb_substream *subs = &as->substream[direction];
1087         int ret;
1088
1089         snd_media_stop_pipeline(subs);
1090
1091         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
1092                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1093                 snd_usb_unlock_shutdown(subs->stream->chip);
1094                 if (ret < 0)
1095                         return ret;
1096         }
1097
1098         subs->pcm_substream = NULL;
1099         snd_usb_autosuspend(subs->stream->chip);
1100
1101         return 0;
1102 }
1103
1104 /* Since a URB can handle only a single linear buffer, we must use double
1105  * buffering when the data to be transferred overflows the buffer boundary.
1106  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1107  * for all URBs.
1108  */
1109 static void retire_capture_urb(struct snd_usb_substream *subs,
1110                                struct urb *urb)
1111 {
1112         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1113         unsigned int stride, frames, bytes, oldptr;
1114         int i, period_elapsed = 0;
1115         unsigned long flags;
1116         unsigned char *cp;
1117         int current_frame_number;
1118
1119         /* read frame number here, update pointer in critical section */
1120         current_frame_number = usb_get_current_frame_number(subs->dev);
1121
1122         stride = runtime->frame_bits >> 3;
1123
1124         for (i = 0; i < urb->number_of_packets; i++) {
1125                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1126                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1127                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1128                                 i, urb->iso_frame_desc[i].status);
1129                         // continue;
1130                 }
1131                 bytes = urb->iso_frame_desc[i].actual_length;
1132                 if (subs->stream_offset_adj > 0) {
1133                         unsigned int adj = min(subs->stream_offset_adj, bytes);
1134                         cp += adj;
1135                         bytes -= adj;
1136                         subs->stream_offset_adj -= adj;
1137                 }
1138                 frames = bytes / stride;
1139                 if (!subs->txfr_quirk)
1140                         bytes = frames * stride;
1141                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1142                         int oldbytes = bytes;
1143                         bytes = frames * stride;
1144                         dev_warn_ratelimited(&subs->dev->dev,
1145                                  "Corrected urb data len. %d->%d\n",
1146                                                         oldbytes, bytes);
1147                 }
1148                 /* update the current pointer */
1149                 spin_lock_irqsave(&subs->lock, flags);
1150                 oldptr = subs->hwptr_done;
1151                 subs->hwptr_done += bytes;
1152                 if (subs->hwptr_done >= subs->buffer_bytes)
1153                         subs->hwptr_done -= subs->buffer_bytes;
1154                 frames = (bytes + (oldptr % stride)) / stride;
1155                 subs->transfer_done += frames;
1156                 if (subs->transfer_done >= runtime->period_size) {
1157                         subs->transfer_done -= runtime->period_size;
1158                         period_elapsed = 1;
1159                 }
1160
1161                 /* realign last_frame_number */
1162                 subs->last_frame_number = current_frame_number;
1163
1164                 spin_unlock_irqrestore(&subs->lock, flags);
1165                 /* copy a data chunk */
1166                 if (oldptr + bytes > subs->buffer_bytes) {
1167                         unsigned int bytes1 = subs->buffer_bytes - oldptr;
1168
1169                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1170                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1171                 } else {
1172                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1173                 }
1174         }
1175
1176         if (period_elapsed)
1177                 snd_pcm_period_elapsed(subs->pcm_substream);
1178 }
1179
1180 static void urb_ctx_queue_advance(struct snd_usb_substream *subs,
1181                                   struct urb *urb, unsigned int bytes)
1182 {
1183         struct snd_urb_ctx *ctx = urb->context;
1184
1185         ctx->queued += bytes;
1186         subs->inflight_bytes += bytes;
1187         subs->hwptr_done += bytes;
1188         if (subs->hwptr_done >= subs->buffer_bytes)
1189                 subs->hwptr_done -= subs->buffer_bytes;
1190 }
1191
1192 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1193                                              struct urb *urb, unsigned int bytes)
1194 {
1195         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1196         unsigned int dst_idx = 0;
1197         unsigned int src_idx = subs->hwptr_done;
1198         unsigned int wrap = subs->buffer_bytes;
1199         u8 *dst = urb->transfer_buffer;
1200         u8 *src = runtime->dma_area;
1201         u8 marker[] = { 0x05, 0xfa };
1202         unsigned int queued = 0;
1203
1204         /*
1205          * The DSP DOP format defines a way to transport DSD samples over
1206          * normal PCM data endpoints. It requires stuffing of marker bytes
1207          * (0x05 and 0xfa, alternating per sample frame), and then expects
1208          * 2 additional bytes of actual payload. The whole frame is stored
1209          * LSB.
1210          *
1211          * Hence, for a stereo transport, the buffer layout looks like this,
1212          * where L refers to left channel samples and R to right.
1213          *
1214          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1215          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1216          *   .....
1217          *
1218          */
1219
1220         while (bytes--) {
1221                 if (++subs->dsd_dop.byte_idx == 3) {
1222                         /* frame boundary? */
1223                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1224                         src_idx += 2;
1225                         subs->dsd_dop.byte_idx = 0;
1226
1227                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1228                                 /* alternate the marker */
1229                                 subs->dsd_dop.marker++;
1230                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1231                                 subs->dsd_dop.channel = 0;
1232                         }
1233                 } else {
1234                         /* stuff the DSD payload */
1235                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1236
1237                         if (subs->cur_audiofmt->dsd_bitrev)
1238                                 dst[dst_idx++] = bitrev8(src[idx]);
1239                         else
1240                                 dst[dst_idx++] = src[idx];
1241                         queued++;
1242                 }
1243         }
1244
1245         urb_ctx_queue_advance(subs, urb, queued);
1246 }
1247
1248 /* copy bit-reversed bytes onto transfer buffer */
1249 static void fill_playback_urb_dsd_bitrev(struct snd_usb_substream *subs,
1250                                          struct urb *urb, unsigned int bytes)
1251 {
1252         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1253         const u8 *src = runtime->dma_area;
1254         u8 *buf = urb->transfer_buffer;
1255         int i, ofs = subs->hwptr_done;
1256
1257         for (i = 0; i < bytes; i++) {
1258                 *buf++ = bitrev8(src[ofs]);
1259                 if (++ofs >= subs->buffer_bytes)
1260                         ofs = 0;
1261         }
1262
1263         urb_ctx_queue_advance(subs, urb, bytes);
1264 }
1265
1266 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1267                         int offset, int stride, unsigned int bytes)
1268 {
1269         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1270
1271         if (subs->hwptr_done + bytes > subs->buffer_bytes) {
1272                 /* err, the transferred area goes over buffer boundary. */
1273                 unsigned int bytes1 = subs->buffer_bytes - subs->hwptr_done;
1274
1275                 memcpy(urb->transfer_buffer + offset,
1276                        runtime->dma_area + subs->hwptr_done, bytes1);
1277                 memcpy(urb->transfer_buffer + offset + bytes1,
1278                        runtime->dma_area, bytes - bytes1);
1279         } else {
1280                 memcpy(urb->transfer_buffer + offset,
1281                        runtime->dma_area + subs->hwptr_done, bytes);
1282         }
1283
1284         urb_ctx_queue_advance(subs, urb, bytes);
1285 }
1286
1287 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1288                                       struct urb *urb, int stride,
1289                                       unsigned int bytes)
1290 {
1291         __le32 packet_length;
1292         int i;
1293
1294         /* Put __le32 length descriptor at start of each packet. */
1295         for (i = 0; i < urb->number_of_packets; i++) {
1296                 unsigned int length = urb->iso_frame_desc[i].length;
1297                 unsigned int offset = urb->iso_frame_desc[i].offset;
1298
1299                 packet_length = cpu_to_le32(length);
1300                 offset += i * sizeof(packet_length);
1301                 urb->iso_frame_desc[i].offset = offset;
1302                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1303                 memcpy(urb->transfer_buffer + offset,
1304                        &packet_length, sizeof(packet_length));
1305                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1306                             stride, length);
1307         }
1308         /* Adjust transfer size accordingly. */
1309         bytes += urb->number_of_packets * sizeof(packet_length);
1310         return bytes;
1311 }
1312
1313 static void prepare_playback_urb(struct snd_usb_substream *subs,
1314                                  struct urb *urb)
1315 {
1316         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1317         struct snd_usb_endpoint *ep = subs->data_endpoint;
1318         struct snd_urb_ctx *ctx = urb->context;
1319         unsigned int counts, frames, bytes;
1320         int i, stride, period_elapsed = 0;
1321         unsigned long flags;
1322
1323         stride = ep->stride;
1324
1325         frames = 0;
1326         ctx->queued = 0;
1327         urb->number_of_packets = 0;
1328         spin_lock_irqsave(&subs->lock, flags);
1329         subs->frame_limit += ep->max_urb_frames;
1330         for (i = 0; i < ctx->packets; i++) {
1331                 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i);
1332                 /* set up descriptor */
1333                 urb->iso_frame_desc[i].offset = frames * stride;
1334                 urb->iso_frame_desc[i].length = counts * stride;
1335                 frames += counts;
1336                 urb->number_of_packets++;
1337                 subs->transfer_done += counts;
1338                 if (subs->transfer_done >= runtime->period_size) {
1339                         subs->transfer_done -= runtime->period_size;
1340                         subs->frame_limit = 0;
1341                         period_elapsed = 1;
1342                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1343                                 if (subs->transfer_done > 0) {
1344                                         /* FIXME: fill-max mode is not
1345                                          * supported yet */
1346                                         frames -= subs->transfer_done;
1347                                         counts -= subs->transfer_done;
1348                                         urb->iso_frame_desc[i].length =
1349                                                 counts * stride;
1350                                         subs->transfer_done = 0;
1351                                 }
1352                                 i++;
1353                                 if (i < ctx->packets) {
1354                                         /* add a transfer delimiter */
1355                                         urb->iso_frame_desc[i].offset =
1356                                                 frames * stride;
1357                                         urb->iso_frame_desc[i].length = 0;
1358                                         urb->number_of_packets++;
1359                                 }
1360                                 break;
1361                         }
1362                 }
1363                 /* finish at the period boundary or after enough frames */
1364                 if ((period_elapsed ||
1365                                 subs->transfer_done >= subs->frame_limit) &&
1366                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1367                         break;
1368         }
1369         bytes = frames * stride;
1370
1371         if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1372                      subs->cur_audiofmt->dsd_dop)) {
1373                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1374         } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1375                            subs->cur_audiofmt->dsd_bitrev)) {
1376                 fill_playback_urb_dsd_bitrev(subs, urb, bytes);
1377         } else {
1378                 /* usual PCM */
1379                 if (!subs->tx_length_quirk)
1380                         copy_to_urb(subs, urb, 0, stride, bytes);
1381                 else
1382                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1383                         /* bytes is now amount of outgoing data */
1384         }
1385
1386         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1387
1388         if (subs->trigger_tstamp_pending_update) {
1389                 /* this is the first actual URB submitted,
1390                  * update trigger timestamp to reflect actual start time
1391                  */
1392                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1393                 subs->trigger_tstamp_pending_update = false;
1394         }
1395
1396         spin_unlock_irqrestore(&subs->lock, flags);
1397         urb->transfer_buffer_length = bytes;
1398         if (period_elapsed)
1399                 snd_pcm_period_elapsed(subs->pcm_substream);
1400 }
1401
1402 /*
1403  * process after playback data complete
1404  * - decrease the delay count again
1405  */
1406 static void retire_playback_urb(struct snd_usb_substream *subs,
1407                                struct urb *urb)
1408 {
1409         unsigned long flags;
1410         struct snd_urb_ctx *ctx = urb->context;
1411
1412         spin_lock_irqsave(&subs->lock, flags);
1413         if (ctx->queued) {
1414                 if (subs->inflight_bytes >= ctx->queued)
1415                         subs->inflight_bytes -= ctx->queued;
1416                 else
1417                         subs->inflight_bytes = 0;
1418         }
1419
1420         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1421         spin_unlock_irqrestore(&subs->lock, flags);
1422 }
1423
1424 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1425                                               int cmd)
1426 {
1427         struct snd_usb_substream *subs = substream->runtime->private_data;
1428         int err;
1429
1430         switch (cmd) {
1431         case SNDRV_PCM_TRIGGER_START:
1432                 subs->trigger_tstamp_pending_update = true;
1433                 fallthrough;
1434         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1435                 snd_usb_endpoint_set_callback(subs->data_endpoint,
1436                                               prepare_playback_urb,
1437                                               retire_playback_urb,
1438                                               subs);
1439                 if (cmd == SNDRV_PCM_TRIGGER_START) {
1440                         err = start_endpoints(subs);
1441                         if (err < 0) {
1442                                 snd_usb_endpoint_set_callback(subs->data_endpoint,
1443                                                               NULL, NULL, NULL);
1444                                 return err;
1445                         }
1446                 }
1447                 subs->running = 1;
1448                 dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
1449                         subs->cur_audiofmt->iface,
1450                         subs->cur_audiofmt->altsetting);
1451                 return 0;
1452         case SNDRV_PCM_TRIGGER_SUSPEND:
1453         case SNDRV_PCM_TRIGGER_STOP:
1454                 stop_endpoints(subs);
1455                 snd_usb_endpoint_set_callback(subs->data_endpoint,
1456                                               NULL, NULL, NULL);
1457                 subs->running = 0;
1458                 dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
1459                         subs->cur_audiofmt->iface,
1460                         subs->cur_audiofmt->altsetting);
1461                 return 0;
1462         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1463                 /* keep retire_data_urb for delay calculation */
1464                 snd_usb_endpoint_set_callback(subs->data_endpoint,
1465                                               NULL,
1466                                               retire_playback_urb,
1467                                               subs);
1468                 subs->running = 0;
1469                 dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
1470                         subs->cur_audiofmt->iface,
1471                         subs->cur_audiofmt->altsetting);
1472                 return 0;
1473         }
1474
1475         return -EINVAL;
1476 }
1477
1478 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1479                                              int cmd)
1480 {
1481         int err;
1482         struct snd_usb_substream *subs = substream->runtime->private_data;
1483
1484         switch (cmd) {
1485         case SNDRV_PCM_TRIGGER_START:
1486                 err = start_endpoints(subs);
1487                 if (err < 0)
1488                         return err;
1489                 fallthrough;
1490         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1491                 snd_usb_endpoint_set_callback(subs->data_endpoint,
1492                                               NULL, retire_capture_urb,
1493                                               subs);
1494                 subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1495                 subs->running = 1;
1496                 dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
1497                         subs->cur_audiofmt->iface,
1498                         subs->cur_audiofmt->altsetting);
1499                 return 0;
1500         case SNDRV_PCM_TRIGGER_SUSPEND:
1501         case SNDRV_PCM_TRIGGER_STOP:
1502                 stop_endpoints(subs);
1503                 fallthrough;
1504         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1505                 snd_usb_endpoint_set_callback(subs->data_endpoint,
1506                                               NULL, NULL, NULL);
1507                 subs->running = 0;
1508                 dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
1509                         subs->cur_audiofmt->iface,
1510                         subs->cur_audiofmt->altsetting);
1511                 return 0;
1512         }
1513
1514         return -EINVAL;
1515 }
1516
1517 static const struct snd_pcm_ops snd_usb_playback_ops = {
1518         .open =         snd_usb_pcm_open,
1519         .close =        snd_usb_pcm_close,
1520         .hw_params =    snd_usb_hw_params,
1521         .hw_free =      snd_usb_hw_free,
1522         .prepare =      snd_usb_pcm_prepare,
1523         .trigger =      snd_usb_substream_playback_trigger,
1524         .sync_stop =    snd_usb_pcm_sync_stop,
1525         .pointer =      snd_usb_pcm_pointer,
1526 };
1527
1528 static const struct snd_pcm_ops snd_usb_capture_ops = {
1529         .open =         snd_usb_pcm_open,
1530         .close =        snd_usb_pcm_close,
1531         .hw_params =    snd_usb_hw_params,
1532         .hw_free =      snd_usb_hw_free,
1533         .prepare =      snd_usb_pcm_prepare,
1534         .trigger =      snd_usb_substream_capture_trigger,
1535         .sync_stop =    snd_usb_pcm_sync_stop,
1536         .pointer =      snd_usb_pcm_pointer,
1537 };
1538
1539 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1540 {
1541         const struct snd_pcm_ops *ops;
1542
1543         ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1544                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1545         snd_pcm_set_ops(pcm, stream, ops);
1546 }
1547
1548 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1549 {
1550         struct snd_pcm *pcm = subs->stream->pcm;
1551         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1552         struct device *dev = subs->dev->bus->sysdev;
1553
1554         if (snd_usb_use_vmalloc)
1555                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1556                                            NULL, 0, 0);
1557         else
1558                 snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1559                                            dev, 64*1024, 512*1024);
1560 }