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 "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 */
  32 snd_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  */
  66 static 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  */
  84 static 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
 141 static 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
 168 static 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  */
 193 int 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
 211 static 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
 263 static 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
 277 static 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  */
 309 static 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(0x07fd, 0x0008): /* MOTU M Series */
 352         case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
 353                 ep = 0x81;
 354                 ifnum = 2;
 355                 goto add_sync_ep_from_ifnum;
 356         case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 357                 /* BOSS Katana amplifiers do not need quirks */
 358                 return 0;
 359         }
 360
 361         if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 362             altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 363             altsd->bInterfaceProtocol == 2 &&
 364             altsd->bNumEndpoints == 1 &&
 365             USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 366             search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 367                                       altsd->bAlternateSetting,
 368                                       &alts, &ep) >= 0) {
 369                 goto add_sync_ep;
 370         }
 371
 372         /* No quirk */
 373         return 0;
 374
 375 add_sync_ep_from_ifnum:
 376         iface = usb_ifnum_to_if(dev, ifnum);
 377
 378         if (!iface || iface->num_altsetting < 2)
 379                 return -EINVAL;
 380
 381         alts = &iface->altsetting[1];
 382
 383 add_sync_ep:
 384         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 385                                                    alts, ep, !subs->direction,
 386                                                    SND_USB_ENDPOINT_TYPE_DATA);
 387         if (!subs->sync_endpoint)
 388                 return -EINVAL;
 389
 390         subs->sync_endpoint->is_implicit_feedback = 1;
 391
 392         subs->data_endpoint->sync_master = subs->sync_endpoint;
 393
 394         return 1;
 395 }
 396
 397 static int set_sync_endpoint(struct snd_usb_substream *subs,
 398                              struct audioformat *fmt,
 399                              struct usb_device *dev,
 400                              struct usb_host_interface *alts,
 401                              struct usb_interface_descriptor *altsd)
 402 {
 403         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 404         unsigned int ep, attr;
 405         bool implicit_fb;
 406         int err;
 407
 408         /* we need a sync pipe in async OUT or adaptive IN mode */
 409         /* check the number of EP, since some devices have broken
 410          * descriptors which fool us.  if it has only one EP,
 411          * assume it as adaptive-out or sync-in.
 412          */
 413         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 414
 415         if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 416                 (!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 417
 418                 /*
 419                  * In these modes the notion of sync_endpoint is irrelevant.
 420                  * Reset pointers to avoid using stale data from previously
 421                  * used settings, e.g. when configuration and endpoints were
 422                  * changed
 423                  */
 424
 425                 subs->sync_endpoint = NULL;
 426                 subs->data_endpoint->sync_master = NULL;
 427         }
 428
 429         err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 430         if (err < 0)
 431                 return err;
 432
 433         /* endpoint set by quirk */
 434         if (err > 0)
 435                 return 0;
 436
 437         if (altsd->bNumEndpoints < 2)
 438                 return 0;
 439
 440         if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 441                              attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 442             (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 443                 return 0;
 444
 445         /*
 446          * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 447          * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 448          * error fall back to SYNC mode and don't create sync endpoint
 449          */
 450
 451         /* check sync-pipe endpoint */
 452         /* ... and check descriptor size before accessing bSynchAddress
 453            because there is a version of the SB Audigy 2 NX firmware lacking
 454            the audio fields in the endpoint descriptors */
 455         if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 456             (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 457              get_endpoint(alts, 1)->bSynchAddress != 0)) {
 458                 dev_err(&dev->dev,
 459                         "%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 460                            fmt->iface, fmt->altsetting,
 461                            get_endpoint(alts, 1)->bmAttributes,
 462                            get_endpoint(alts, 1)->bLength,
 463                            get_endpoint(alts, 1)->bSynchAddress);
 464                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 465                         return 0;
 466                 return -EINVAL;
 467         }
 468         ep = get_endpoint(alts, 1)->bEndpointAddress;
 469         if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 470             get_endpoint(alts, 0)->bSynchAddress != 0 &&
 471             ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 472              (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 473                 dev_err(&dev->dev,
 474                         "%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 475                            fmt->iface, fmt->altsetting,
 476                            is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 477                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 478                         return 0;
 479                 return -EINVAL;
 480         }
 481
 482         implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 483                         == USB_ENDPOINT_USAGE_IMPLICIT_FB;
 484
 485         subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 486                                                    alts, ep, !subs->direction,
 487                                                    implicit_fb ?
 488                                                         SND_USB_ENDPOINT_TYPE_DATA :
 489                                                         SND_USB_ENDPOINT_TYPE_SYNC);
 490
 491         if (!subs->sync_endpoint) {
 492                 if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 493                         return 0;
 494                 return -EINVAL;
 495         }
 496
 497         subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 498
 499         subs->data_endpoint->sync_master = subs->sync_endpoint;
 500
 501         return 0;
 502 }
 503
 504 /*
 505  * find a matching format and set up the interface
 506  */
 507 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 508 {
 509         struct usb_device *dev = subs->dev;
 510         struct usb_host_interface *alts;
 511         struct usb_interface_descriptor *altsd;
 512         struct usb_interface *iface;
 513         int err;
 514
 515         iface = usb_ifnum_to_if(dev, fmt->iface);
 516         if (WARN_ON(!iface))
 517                 return -EINVAL;
 518         alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 519         if (WARN_ON(!alts))
 520                 return -EINVAL;
 521         altsd = get_iface_desc(alts);
 522
 523         if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 524                 return 0;
 525
 526         /* close the old interface */
 527         if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 528                 if (!subs->stream->chip->keep_iface) {
 529                         err = usb_set_interface(subs->dev, subs->interface, 0);
 530                         if (err < 0) {
 531                                 dev_err(&dev->dev,
 532                                         "%d:%d: return to setting 0 failed (%d)\n",
 533                                         fmt->iface, fmt->altsetting, err);
 534                                 return -EIO;
 535                         }
 536                 }
 537                 subs->interface = -1;
 538                 subs->altset_idx = 0;
 539         }
 540
 541         if (subs->need_setup_fmt)
 542                 subs->need_setup_fmt = false;
 543
 544         /* set interface */
 545         if (iface->cur_altsetting != alts) {
 546                 err = snd_usb_select_mode_quirk(subs, fmt);
 547                 if (err < 0)
 548                         return -EIO;
 549
 550                 err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 551                 if (err < 0) {
 552                         dev_err(&dev->dev,
 553                                 "%d:%d: usb_set_interface failed (%d)\n",
 554                                 fmt->iface, fmt->altsetting, err);
 555                         return -EIO;
 556                 }
 557                 dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 558                         fmt->iface, fmt->altsetting);
 559                 snd_usb_set_interface_quirk(dev);
 560         }
 561
 562         subs->interface = fmt->iface;
 563         subs->altset_idx = fmt->altset_idx;
 564         subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 565                                                    alts, fmt->endpoint, subs->direction,
 566                                                    SND_USB_ENDPOINT_TYPE_DATA);
 567
 568         if (!subs->data_endpoint)
 569                 return -EINVAL;
 570
 571         err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 572         if (err < 0)
 573                 return err;
 574
 575         err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 576         if (err < 0)
 577                 return err;
 578
 579         subs->cur_audiofmt = fmt;
 580
 581         snd_usb_set_format_quirk(subs, fmt);
 582
 583         return 0;
 584 }
 585
 586 /*
 587  * Return the score of matching two audioformats.
 588  * Veto the audioformat if:
 589  * - It has no channels for some reason.
 590  * - Requested PCM format is not supported.
 591  * - Requested sample rate is not supported.
 592  */
 593 static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 594                                        struct audioformat *fp,
 595                                        struct audioformat *match, int rate,
 596                                        snd_pcm_format_t pcm_format)
 597 {
 598         int i;
 599         int score = 0;
 600
 601         if (fp->channels < 1) {
 602                 dev_dbg(&subs->dev->dev,
 603                         "%s: (fmt @%p) no channels\n", __func__, fp);
 604                 return 0;
 605         }
 606
 607         if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 608                 dev_dbg(&subs->dev->dev,
 609                         "%s: (fmt @%p) no match for format %d\n", __func__,
 610                         fp, pcm_format);
 611                 return 0;
 612         }
 613
 614         for (i = 0; i < fp->nr_rates; i++) {
 615                 if (fp->rate_table[i] == rate) {
 616                         score++;
 617                         break;
 618                 }
 619         }
 620         if (!score) {
 621                 dev_dbg(&subs->dev->dev,
 622                         "%s: (fmt @%p) no match for rate %d\n", __func__,
 623                         fp, rate);
 624                 return 0;
 625         }
 626
 627         if (fp->channels == match->channels)
 628                 score++;
 629
 630         dev_dbg(&subs->dev->dev,
 631                 "%s: (fmt @%p) score %d\n", __func__, fp, score);
 632
 633         return score;
 634 }
 635
 636 /*
 637  * Configure the sync ep using the rate and pcm format of the data ep.
 638  */
 639 static int configure_sync_endpoint(struct snd_usb_substream *subs)
 640 {
 641         int ret;
 642         struct audioformat *fp;
 643         struct audioformat *sync_fp = NULL;
 644         int cur_score = 0;
 645         int sync_period_bytes = subs->period_bytes;
 646         struct snd_usb_substream *sync_subs =
 647                 &subs->stream->substream[subs->direction ^ 1];
 648
 649         if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 650             !subs->stream)
 651                 return snd_usb_endpoint_set_params(subs->sync_endpoint,
 652                                                    subs->pcm_format,
 653                                                    subs->channels,
 654                                                    subs->period_bytes,
 655                                                    0, 0,
 656                                                    subs->cur_rate,
 657                                                    subs->cur_audiofmt,
 658                                                    NULL);
 659
 660         /* Try to find the best matching audioformat. */
 661         list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 662                 int score = match_endpoint_audioformats(subs,
 663                                                         fp, subs->cur_audiofmt,
 664                         subs->cur_rate, subs->pcm_format);
 665
 666                 if (score > cur_score) {
 667                         sync_fp = fp;
 668                         cur_score = score;
 669                 }
 670         }
 671
 672         if (unlikely(sync_fp == NULL)) {
 673                 dev_err(&subs->dev->dev,
 674                         "%s: no valid audioformat for sync ep %x found\n",
 675                         __func__, sync_subs->ep_num);
 676                 return -EINVAL;
 677         }
 678
 679         /*
 680          * Recalculate the period bytes if channel number differ between
 681          * data and sync ep audioformat.
 682          */
 683         if (sync_fp->channels != subs->channels) {
 684                 sync_period_bytes = (subs->period_bytes / subs->channels) *
 685                         sync_fp->channels;
 686                 dev_dbg(&subs->dev->dev,
 687                         "%s: adjusted sync ep period bytes (%d -> %d)\n",
 688                         __func__, subs->period_bytes, sync_period_bytes);
 689         }
 690
 691         ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 692                                           subs->pcm_format,
 693                                           sync_fp->channels,
 694                                           sync_period_bytes,
 695                                           0, 0,
 696                                           subs->cur_rate,
 697                                           sync_fp,
 698                                           NULL);
 699
 700         return ret;
 701 }
 702
 703 /*
 704  * configure endpoint params
 705  *
 706  * called  during initial setup and upon resume
 707  */
 708 static int configure_endpoint(struct snd_usb_substream *subs)
 709 {
 710         int ret;
 711
 712         /* format changed */
 713         stop_endpoints(subs, true);
 714         ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 715                                           subs->pcm_format,
 716                                           subs->channels,
 717                                           subs->period_bytes,
 718                                           subs->period_frames,
 719                                           subs->buffer_periods,
 720                                           subs->cur_rate,
 721                                           subs->cur_audiofmt,
 722                                           subs->sync_endpoint);
 723         if (ret < 0)
 724                 return ret;
 725
 726         if (subs->sync_endpoint)
 727                 ret = configure_sync_endpoint(subs);
 728
 729         return ret;
 730 }
 731
 732 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 733 {
 734         int ret;
 735
 736         if (!subs->str_pd)
 737                 return 0;
 738
 739         ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 740         if (ret < 0) {
 741                 dev_err(&subs->dev->dev,
 742                         "Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 743                         subs->str_pd->pd_id, state, ret);
 744                 return ret;
 745         }
 746
 747         return 0;
 748 }
 749
 750 int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 751 {
 752         int ret;
 753
 754         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 755         if (ret < 0)
 756                 return ret;
 757
 758         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 759         if (ret < 0)
 760                 return ret;
 761
 762         return 0;
 763 }
 764
 765 int snd_usb_pcm_resume(struct snd_usb_stream *as)
 766 {
 767         int ret;
 768
 769         ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 770         if (ret < 0)
 771                 return ret;
 772
 773         ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 774         if (ret < 0)
 775                 return ret;
 776
 777         return 0;
 778 }
 779
 780 /*
 781  * hw_params callback
 782  *
 783  * allocate a buffer and set the given audio format.
 784  *
 785  * so far we use a physically linear buffer although packetize transfer
 786  * doesn't need a continuous area.
 787  * if sg buffer is supported on the later version of alsa, we'll follow
 788  * that.
 789  */
 790 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 791                              struct snd_pcm_hw_params *hw_params)
 792 {
 793         struct snd_usb_substream *subs = substream->runtime->private_data;
 794         struct audioformat *fmt;
 795         int ret;
 796
 797         ret = snd_media_start_pipeline(subs);
 798         if (ret)
 799                 return ret;
 800
 801         if (snd_usb_use_vmalloc)
 802                 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 803                                                        params_buffer_bytes(hw_params));
 804         else
 805                 ret = snd_pcm_lib_malloc_pages(substream,
 806                                                params_buffer_bytes(hw_params));
 807         if (ret < 0)
 808                 goto stop_pipeline;
 809
 810         subs->pcm_format = params_format(hw_params);
 811         subs->period_bytes = params_period_bytes(hw_params);
 812         subs->period_frames = params_period_size(hw_params);
 813         subs->buffer_periods = params_periods(hw_params);
 814         subs->channels = params_channels(hw_params);
 815         subs->cur_rate = params_rate(hw_params);
 816
 817         fmt = find_format(subs);
 818         if (!fmt) {
 819                 dev_dbg(&subs->dev->dev,
 820                         "cannot set format: format = %#x, rate = %d, channels = %d\n",
 821                            subs->pcm_format, subs->cur_rate, subs->channels);
 822                 ret = -EINVAL;
 823                 goto stop_pipeline;
 824         }
 825
 826         ret = snd_usb_lock_shutdown(subs->stream->chip);
 827         if (ret < 0)
 828                 goto stop_pipeline;
 829
 830         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 831         if (ret < 0)
 832                 goto unlock;
 833
 834         ret = set_format(subs, fmt);
 835         if (ret < 0)
 836                 goto unlock;
 837
 838         subs->interface = fmt->iface;
 839         subs->altset_idx = fmt->altset_idx;
 840         subs->need_setup_ep = true;
 841
 842  unlock:
 843         snd_usb_unlock_shutdown(subs->stream->chip);
 844         if (ret < 0)
 845                 goto stop_pipeline;
 846         return ret;
 847
 848  stop_pipeline:
 849         snd_media_stop_pipeline(subs);
 850         return ret;
 851 }
 852
 853 /*
 854  * hw_free callback
 855  *
 856  * reset the audio format and release the buffer
 857  */
 858 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 859 {
 860         struct snd_usb_substream *subs = substream->runtime->private_data;
 861
 862         snd_media_stop_pipeline(subs);
 863         subs->cur_audiofmt = NULL;
 864         subs->cur_rate = 0;
 865         subs->period_bytes = 0;
 866         if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 867                 stop_endpoints(subs, true);
 868                 snd_usb_endpoint_deactivate(subs->sync_endpoint);
 869                 snd_usb_endpoint_deactivate(subs->data_endpoint);
 870                 snd_usb_unlock_shutdown(subs->stream->chip);
 871         }
 872
 873         if (snd_usb_use_vmalloc)
 874                 return snd_pcm_lib_free_vmalloc_buffer(substream);
 875         else
 876                 return snd_pcm_lib_free_pages(substream);
 877 }
 878
 879 /*
 880  * prepare callback
 881  *
 882  * only a few subtle things...
 883  */
 884 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 885 {
 886         struct snd_pcm_runtime *runtime = substream->runtime;
 887         struct snd_usb_substream *subs = runtime->private_data;
 888         struct usb_host_interface *alts;
 889         struct usb_interface *iface;
 890         int ret;
 891
 892         if (! subs->cur_audiofmt) {
 893                 dev_err(&subs->dev->dev, "no format is specified!\n");
 894                 return -ENXIO;
 895         }
 896
 897         ret = snd_usb_lock_shutdown(subs->stream->chip);
 898         if (ret < 0)
 899                 return ret;
 900         if (snd_BUG_ON(!subs->data_endpoint)) {
 901                 ret = -EIO;
 902                 goto unlock;
 903         }
 904
 905         snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 906         snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 907
 908         ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 909         if (ret < 0)
 910                 goto unlock;
 911
 912         ret = set_format(subs, subs->cur_audiofmt);
 913         if (ret < 0)
 914                 goto unlock;
 915
 916         if (subs->need_setup_ep) {
 917
 918                 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 919                 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 920                 ret = snd_usb_init_sample_rate(subs->stream->chip,
 921                                                subs->cur_audiofmt->iface,
 922                                                alts,
 923                                                subs->cur_audiofmt,
 924                                                subs->cur_rate);
 925                 if (ret < 0)
 926                         goto unlock;
 927
 928                 ret = configure_endpoint(subs);
 929                 if (ret < 0)
 930                         goto unlock;
 931                 subs->need_setup_ep = false;
 932         }
 933
 934         /* some unit conversions in runtime */
 935         subs->data_endpoint->maxframesize =
 936                 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 937         subs->data_endpoint->curframesize =
 938                 bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 939
 940         /* reset the pointer */
 941         subs->hwptr_done = 0;
 942         subs->transfer_done = 0;
 943         subs->last_delay = 0;
 944         subs->last_frame_number = 0;
 945         runtime->delay = 0;
 946
 947         /* for playback, submit the URBs now; otherwise, the first hwptr_done
 948          * updates for all URBs would happen at the same time when starting */
 949         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 950                 ret = start_endpoints(subs);
 951
 952  unlock:
 953         snd_usb_unlock_shutdown(subs->stream->chip);
 954         return ret;
 955 }
 956
 957 static const struct snd_pcm_hardware snd_usb_hardware =
 958 {
 959         .info =                 SNDRV_PCM_INFO_MMAP |
 960                                 SNDRV_PCM_INFO_MMAP_VALID |
 961                                 SNDRV_PCM_INFO_BATCH |
 962                                 SNDRV_PCM_INFO_INTERLEAVED |
 963                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 964                                 SNDRV_PCM_INFO_PAUSE,
 965         .buffer_bytes_max =     1024 * 1024,
 966         .period_bytes_min =     64,
 967         .period_bytes_max =     512 * 1024,
 968         .periods_min =          2,
 969         .periods_max =          1024,
 970 };
 971
 972 static int hw_check_valid_format(struct snd_usb_substream *subs,
 973                                  struct snd_pcm_hw_params *params,
 974                                  struct audioformat *fp)
 975 {
 976         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 977         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 978         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 979         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 980         struct snd_mask check_fmts;
 981         unsigned int ptime;
 982
 983         /* check the format */
 984         snd_mask_none(&check_fmts);
 985         check_fmts.bits[0] = (u32)fp->formats;
 986         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 987         snd_mask_intersect(&check_fmts, fmts);
 988         if (snd_mask_empty(&check_fmts)) {
 989                 hwc_debug("   > check: no supported format %d\n", fp->format);
 990                 return 0;
 991         }
 992         /* check the channels */
 993         if (fp->channels < ct->min || fp->channels > ct->max) {
 994                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 995                 return 0;
 996         }
 997         /* check the rate is within the range */
 998         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 999                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1000                 return 0;
1001         }
1002         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1003                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1004                 return 0;
1005         }
1006         /* check whether the period time is >= the data packet interval */
1007         if (subs->speed != USB_SPEED_FULL) {
1008                 ptime = 125 * (1 << fp->datainterval);
1009                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1010                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1011                         return 0;
1012                 }
1013         }
1014         return 1;
1015 }
1016
1017 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1018                         struct snd_pcm_hw_rule *rule)
1019 {
1020         struct snd_usb_substream *subs = rule->private;
1021         struct audioformat *fp;
1022         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1023         unsigned int rmin, rmax;
1024         int changed;
1025
1026         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1027         changed = 0;
1028         rmin = rmax = 0;
1029         list_for_each_entry(fp, &subs->fmt_list, list) {
1030                 if (!hw_check_valid_format(subs, params, fp))
1031                         continue;
1032                 if (changed++) {
1033                         if (rmin > fp->rate_min)
1034                                 rmin = fp->rate_min;
1035                         if (rmax < fp->rate_max)
1036                                 rmax = fp->rate_max;
1037                 } else {
1038                         rmin = fp->rate_min;
1039                         rmax = fp->rate_max;
1040                 }
1041         }
1042
1043         if (!changed) {
1044                 hwc_debug("  --> get empty\n");
1045                 it->empty = 1;
1046                 return -EINVAL;
1047         }
1048
1049         changed = 0;
1050         if (it->min < rmin) {
1051                 it->min = rmin;
1052                 it->openmin = 0;
1053                 changed = 1;
1054         }
1055         if (it->max > rmax) {
1056                 it->max = rmax;
1057                 it->openmax = 0;
1058                 changed = 1;
1059         }
1060         if (snd_interval_checkempty(it)) {
1061                 it->empty = 1;
1062                 return -EINVAL;
1063         }
1064         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1065         return changed;
1066 }
1067
1068
1069 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1070                             struct snd_pcm_hw_rule *rule)
1071 {
1072         struct snd_usb_substream *subs = rule->private;
1073         struct audioformat *fp;
1074         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1075         unsigned int rmin, rmax;
1076         int changed;
1077
1078         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1079         changed = 0;
1080         rmin = rmax = 0;
1081         list_for_each_entry(fp, &subs->fmt_list, list) {
1082                 if (!hw_check_valid_format(subs, params, fp))
1083                         continue;
1084                 if (changed++) {
1085                         if (rmin > fp->channels)
1086                                 rmin = fp->channels;
1087                         if (rmax < fp->channels)
1088                                 rmax = fp->channels;
1089                 } else {
1090                         rmin = fp->channels;
1091                         rmax = fp->channels;
1092                 }
1093         }
1094
1095         if (!changed) {
1096                 hwc_debug("  --> get empty\n");
1097                 it->empty = 1;
1098                 return -EINVAL;
1099         }
1100
1101         changed = 0;
1102         if (it->min < rmin) {
1103                 it->min = rmin;
1104                 it->openmin = 0;
1105                 changed = 1;
1106         }
1107         if (it->max > rmax) {
1108                 it->max = rmax;
1109                 it->openmax = 0;
1110                 changed = 1;
1111         }
1112         if (snd_interval_checkempty(it)) {
1113                 it->empty = 1;
1114                 return -EINVAL;
1115         }
1116         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1117         return changed;
1118 }
1119
1120 static int hw_rule_format(struct snd_pcm_hw_params *params,
1121                           struct snd_pcm_hw_rule *rule)
1122 {
1123         struct snd_usb_substream *subs = rule->private;
1124         struct audioformat *fp;
1125         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1126         u64 fbits;
1127         u32 oldbits[2];
1128         int changed;
1129
1130         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1131         fbits = 0;
1132         list_for_each_entry(fp, &subs->fmt_list, list) {
1133                 if (!hw_check_valid_format(subs, params, fp))
1134                         continue;
1135                 fbits |= fp->formats;
1136         }
1137
1138         oldbits[0] = fmt->bits[0];
1139         oldbits[1] = fmt->bits[1];
1140         fmt->bits[0] &= (u32)fbits;
1141         fmt->bits[1] &= (u32)(fbits >> 32);
1142         if (!fmt->bits[0] && !fmt->bits[1]) {
1143                 hwc_debug("  --> get empty\n");
1144                 return -EINVAL;
1145         }
1146         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1147         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1148         return changed;
1149 }
1150
1151 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1152                                struct snd_pcm_hw_rule *rule)
1153 {
1154         struct snd_usb_substream *subs = rule->private;
1155         struct audioformat *fp;
1156         struct snd_interval *it;
1157         unsigned char min_datainterval;
1158         unsigned int pmin;
1159         int changed;
1160
1161         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1162         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1163         min_datainterval = 0xff;
1164         list_for_each_entry(fp, &subs->fmt_list, list) {
1165                 if (!hw_check_valid_format(subs, params, fp))
1166                         continue;
1167                 min_datainterval = min(min_datainterval, fp->datainterval);
1168         }
1169         if (min_datainterval == 0xff) {
1170                 hwc_debug("  --> get empty\n");
1171                 it->empty = 1;
1172                 return -EINVAL;
1173         }
1174         pmin = 125 * (1 << min_datainterval);
1175         changed = 0;
1176         if (it->min < pmin) {
1177                 it->min = pmin;
1178                 it->openmin = 0;
1179                 changed = 1;
1180         }
1181         if (snd_interval_checkempty(it)) {
1182                 it->empty = 1;
1183                 return -EINVAL;
1184         }
1185         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1186         return changed;
1187 }
1188
1189 /*
1190  *  If the device supports unusual bit rates, does the request meet these?
1191  */
1192 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1193                                   struct snd_usb_substream *subs)
1194 {
1195         struct audioformat *fp;
1196         int *rate_list;
1197         int count = 0, needs_knot = 0;
1198         int err;
1199
1200         kfree(subs->rate_list.list);
1201         subs->rate_list.list = NULL;
1202
1203         list_for_each_entry(fp, &subs->fmt_list, list) {
1204                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1205                         return 0;
1206                 count += fp->nr_rates;
1207                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1208                         needs_knot = 1;
1209         }
1210         if (!needs_knot)
1211                 return 0;
1212
1213         subs->rate_list.list = rate_list =
1214                 kmalloc_array(count, sizeof(int), GFP_KERNEL);
1215         if (!subs->rate_list.list)
1216                 return -ENOMEM;
1217         subs->rate_list.count = count;
1218         subs->rate_list.mask = 0;
1219         count = 0;
1220         list_for_each_entry(fp, &subs->fmt_list, list) {
1221                 int i;
1222                 for (i = 0; i < fp->nr_rates; i++)
1223                         rate_list[count++] = fp->rate_table[i];
1224         }
1225         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1226                                          &subs->rate_list);
1227         if (err < 0)
1228                 return err;
1229
1230         return 0;
1231 }
1232
1233
1234 /*
1235  * set up the runtime hardware information.
1236  */
1237
1238 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1239 {
1240         struct audioformat *fp;
1241         unsigned int pt, ptmin;
1242         int param_period_time_if_needed;
1243         int err;
1244
1245         runtime->hw.formats = subs->formats;
1246
1247         runtime->hw.rate_min = 0x7fffffff;
1248         runtime->hw.rate_max = 0;
1249         runtime->hw.channels_min = 256;
1250         runtime->hw.channels_max = 0;
1251         runtime->hw.rates = 0;
1252         ptmin = UINT_MAX;
1253         /* check min/max rates and channels */
1254         list_for_each_entry(fp, &subs->fmt_list, list) {
1255                 runtime->hw.rates |= fp->rates;
1256                 if (runtime->hw.rate_min > fp->rate_min)
1257                         runtime->hw.rate_min = fp->rate_min;
1258                 if (runtime->hw.rate_max < fp->rate_max)
1259                         runtime->hw.rate_max = fp->rate_max;
1260                 if (runtime->hw.channels_min > fp->channels)
1261                         runtime->hw.channels_min = fp->channels;
1262                 if (runtime->hw.channels_max < fp->channels)
1263                         runtime->hw.channels_max = fp->channels;
1264                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1265                         /* FIXME: there might be more than one audio formats... */
1266                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1267                                 fp->frame_size;
1268                 }
1269                 pt = 125 * (1 << fp->datainterval);
1270                 ptmin = min(ptmin, pt);
1271         }
1272
1273         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1274         if (subs->speed == USB_SPEED_FULL)
1275                 /* full speed devices have fixed data packet interval */
1276                 ptmin = 1000;
1277         if (ptmin == 1000)
1278                 /* if period time doesn't go below 1 ms, no rules needed */
1279                 param_period_time_if_needed = -1;
1280
1281         err = snd_pcm_hw_constraint_minmax(runtime,
1282                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1283                                            ptmin, UINT_MAX);
1284         if (err < 0)
1285                 return err;
1286
1287         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1288                                   hw_rule_rate, subs,
1289                                   SNDRV_PCM_HW_PARAM_FORMAT,
1290                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1291                                   param_period_time_if_needed,
1292                                   -1);
1293         if (err < 0)
1294                 return err;
1295         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1296                                   hw_rule_channels, subs,
1297                                   SNDRV_PCM_HW_PARAM_FORMAT,
1298                                   SNDRV_PCM_HW_PARAM_RATE,
1299                                   param_period_time_if_needed,
1300                                   -1);
1301         if (err < 0)
1302                 return err;
1303         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1304                                   hw_rule_format, subs,
1305                                   SNDRV_PCM_HW_PARAM_RATE,
1306                                   SNDRV_PCM_HW_PARAM_CHANNELS,
1307                                   param_period_time_if_needed,
1308                                   -1);
1309         if (err < 0)
1310                 return err;
1311         if (param_period_time_if_needed >= 0) {
1312                 err = snd_pcm_hw_rule_add(runtime, 0,
1313                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1314                                           hw_rule_period_time, subs,
1315                                           SNDRV_PCM_HW_PARAM_FORMAT,
1316                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1317                                           SNDRV_PCM_HW_PARAM_RATE,
1318                                           -1);
1319                 if (err < 0)
1320                         return err;
1321         }
1322         err = snd_usb_pcm_check_knot(runtime, subs);
1323         if (err < 0)
1324                 return err;
1325
1326         return snd_usb_autoresume(subs->stream->chip);
1327 }
1328
1329 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1330 {
1331         int direction = substream->stream;
1332         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1333         struct snd_pcm_runtime *runtime = substream->runtime;
1334         struct snd_usb_substream *subs = &as->substream[direction];
1335         int ret;
1336
1337         subs->interface = -1;
1338         subs->altset_idx = 0;
1339         runtime->hw = snd_usb_hardware;
1340         runtime->private_data = subs;
1341         subs->pcm_substream = substream;
1342         /* runtime PM is also done there */
1343
1344         /* initialize DSD/DOP context */
1345         subs->dsd_dop.byte_idx = 0;
1346         subs->dsd_dop.channel = 0;
1347         subs->dsd_dop.marker = 1;
1348
1349         ret = setup_hw_info(runtime, subs);
1350         if (ret == 0) {
1351                 ret = snd_media_stream_init(subs, as->pcm, direction);
1352                 if (ret)
1353                         snd_usb_autosuspend(subs->stream->chip);
1354         }
1355         return ret;
1356 }
1357
1358 static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1359 {
1360         int direction = substream->stream;
1361         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1362         struct snd_usb_substream *subs = &as->substream[direction];
1363         int ret;
1364
1365         stop_endpoints(subs, true);
1366         snd_media_stop_pipeline(subs);
1367
1368         if (!as->chip->keep_iface &&
1369             subs->interface >= 0 &&
1370             !snd_usb_lock_shutdown(subs->stream->chip)) {
1371                 usb_set_interface(subs->dev, subs->interface, 0);
1372                 subs->interface = -1;
1373                 ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1374                 snd_usb_unlock_shutdown(subs->stream->chip);
1375                 if (ret < 0)
1376                         return ret;
1377         }
1378
1379         subs->pcm_substream = NULL;
1380         snd_usb_autosuspend(subs->stream->chip);
1381
1382         return 0;
1383 }
1384
1385 /* Since a URB can handle only a single linear buffer, we must use double
1386  * buffering when the data to be transferred overflows the buffer boundary.
1387  * To avoid inconsistencies when updating hwptr_done, we use double buffering
1388  * for all URBs.
1389  */
1390 static void retire_capture_urb(struct snd_usb_substream *subs,
1391                                struct urb *urb)
1392 {
1393         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1394         unsigned int stride, frames, bytes, oldptr;
1395         int i, period_elapsed = 0;
1396         unsigned long flags;
1397         unsigned char *cp;
1398         int current_frame_number;
1399
1400         /* read frame number here, update pointer in critical section */
1401         current_frame_number = usb_get_current_frame_number(subs->dev);
1402
1403         stride = runtime->frame_bits >> 3;
1404
1405         for (i = 0; i < urb->number_of_packets; i++) {
1406                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1407                 if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1408                         dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1409                                 i, urb->iso_frame_desc[i].status);
1410                         // continue;
1411                 }
1412                 bytes = urb->iso_frame_desc[i].actual_length;
1413                 frames = bytes / stride;
1414                 if (!subs->txfr_quirk)
1415                         bytes = frames * stride;
1416                 if (bytes % (runtime->sample_bits >> 3) != 0) {
1417                         int oldbytes = bytes;
1418                         bytes = frames * stride;
1419                         dev_warn_ratelimited(&subs->dev->dev,
1420                                  "Corrected urb data len. %d->%d\n",
1421                                                         oldbytes, bytes);
1422                 }
1423                 /* update the current pointer */
1424                 spin_lock_irqsave(&subs->lock, flags);
1425                 oldptr = subs->hwptr_done;
1426                 subs->hwptr_done += bytes;
1427                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1428                         subs->hwptr_done -= runtime->buffer_size * stride;
1429                 frames = (bytes + (oldptr % stride)) / stride;
1430                 subs->transfer_done += frames;
1431                 if (subs->transfer_done >= runtime->period_size) {
1432                         subs->transfer_done -= runtime->period_size;
1433                         period_elapsed = 1;
1434                 }
1435                 /* capture delay is by construction limited to one URB,
1436                  * reset delays here
1437                  */
1438                 runtime->delay = subs->last_delay = 0;
1439
1440                 /* realign last_frame_number */
1441                 subs->last_frame_number = current_frame_number;
1442                 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1443
1444                 spin_unlock_irqrestore(&subs->lock, flags);
1445                 /* copy a data chunk */
1446                 if (oldptr + bytes > runtime->buffer_size * stride) {
1447                         unsigned int bytes1 =
1448                                         runtime->buffer_size * stride - oldptr;
1449                         memcpy(runtime->dma_area + oldptr, cp, bytes1);
1450                         memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1451                 } else {
1452                         memcpy(runtime->dma_area + oldptr, cp, bytes);
1453                 }
1454         }
1455
1456         if (period_elapsed)
1457                 snd_pcm_period_elapsed(subs->pcm_substream);
1458 }
1459
1460 static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1461                                              struct urb *urb, unsigned int bytes)
1462 {
1463         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1464         unsigned int stride = runtime->frame_bits >> 3;
1465         unsigned int dst_idx = 0;
1466         unsigned int src_idx = subs->hwptr_done;
1467         unsigned int wrap = runtime->buffer_size * stride;
1468         u8 *dst = urb->transfer_buffer;
1469         u8 *src = runtime->dma_area;
1470         u8 marker[] = { 0x05, 0xfa };
1471
1472         /*
1473          * The DSP DOP format defines a way to transport DSD samples over
1474          * normal PCM data endpoints. It requires stuffing of marker bytes
1475          * (0x05 and 0xfa, alternating per sample frame), and then expects
1476          * 2 additional bytes of actual payload. The whole frame is stored
1477          * LSB.
1478          *
1479          * Hence, for a stereo transport, the buffer layout looks like this,
1480          * where L refers to left channel samples and R to right.
1481          *
1482          *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1483          *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1484          *   .....
1485          *
1486          */
1487
1488         while (bytes--) {
1489                 if (++subs->dsd_dop.byte_idx == 3) {
1490                         /* frame boundary? */
1491                         dst[dst_idx++] = marker[subs->dsd_dop.marker];
1492                         src_idx += 2;
1493                         subs->dsd_dop.byte_idx = 0;
1494
1495                         if (++subs->dsd_dop.channel % runtime->channels == 0) {
1496                                 /* alternate the marker */
1497                                 subs->dsd_dop.marker++;
1498                                 subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1499                                 subs->dsd_dop.channel = 0;
1500                         }
1501                 } else {
1502                         /* stuff the DSD payload */
1503                         int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1504
1505                         if (subs->cur_audiofmt->dsd_bitrev)
1506                                 dst[dst_idx++] = bitrev8(src[idx]);
1507                         else
1508                                 dst[dst_idx++] = src[idx];
1509
1510                         subs->hwptr_done++;
1511                 }
1512         }
1513         if (subs->hwptr_done >= runtime->buffer_size * stride)
1514                 subs->hwptr_done -= runtime->buffer_size * stride;
1515 }
1516
1517 static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1518                         int offset, int stride, unsigned int bytes)
1519 {
1520         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1521
1522         if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1523                 /* err, the transferred area goes over buffer boundary. */
1524                 unsigned int bytes1 =
1525                         runtime->buffer_size * stride - subs->hwptr_done;
1526                 memcpy(urb->transfer_buffer + offset,
1527                        runtime->dma_area + subs->hwptr_done, bytes1);
1528                 memcpy(urb->transfer_buffer + offset + bytes1,
1529                        runtime->dma_area, bytes - bytes1);
1530         } else {
1531                 memcpy(urb->transfer_buffer + offset,
1532                        runtime->dma_area + subs->hwptr_done, bytes);
1533         }
1534         subs->hwptr_done += bytes;
1535         if (subs->hwptr_done >= runtime->buffer_size * stride)
1536                 subs->hwptr_done -= runtime->buffer_size * stride;
1537 }
1538
1539 static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1540                                       struct urb *urb, int stride,
1541                                       unsigned int bytes)
1542 {
1543         __le32 packet_length;
1544         int i;
1545
1546         /* Put __le32 length descriptor at start of each packet. */
1547         for (i = 0; i < urb->number_of_packets; i++) {
1548                 unsigned int length = urb->iso_frame_desc[i].length;
1549                 unsigned int offset = urb->iso_frame_desc[i].offset;
1550
1551                 packet_length = cpu_to_le32(length);
1552                 offset += i * sizeof(packet_length);
1553                 urb->iso_frame_desc[i].offset = offset;
1554                 urb->iso_frame_desc[i].length += sizeof(packet_length);
1555                 memcpy(urb->transfer_buffer + offset,
1556                        &packet_length, sizeof(packet_length));
1557                 copy_to_urb(subs, urb, offset + sizeof(packet_length),
1558                             stride, length);
1559         }
1560         /* Adjust transfer size accordingly. */
1561         bytes += urb->number_of_packets * sizeof(packet_length);
1562         return bytes;
1563 }
1564
1565 static void prepare_playback_urb(struct snd_usb_substream *subs,
1566                                  struct urb *urb)
1567 {
1568         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1569         struct snd_usb_endpoint *ep = subs->data_endpoint;
1570         struct snd_urb_ctx *ctx = urb->context;
1571         unsigned int counts, frames, bytes;
1572         int i, stride, period_elapsed = 0;
1573         unsigned long flags;
1574
1575         stride = runtime->frame_bits >> 3;
1576
1577         frames = 0;
1578         urb->number_of_packets = 0;
1579         spin_lock_irqsave(&subs->lock, flags);
1580         subs->frame_limit += ep->max_urb_frames;
1581         for (i = 0; i < ctx->packets; i++) {
1582                 if (ctx->packet_size[i])
1583                         counts = ctx->packet_size[i];
1584                 else if (ep->sync_master)
1585                         counts = snd_usb_endpoint_slave_next_packet_size(ep);
1586                 else
1587                         counts = snd_usb_endpoint_next_packet_size(ep);
1588
1589                 /* set up descriptor */
1590                 urb->iso_frame_desc[i].offset = frames * ep->stride;
1591                 urb->iso_frame_desc[i].length = counts * ep->stride;
1592                 frames += counts;
1593                 urb->number_of_packets++;
1594                 subs->transfer_done += counts;
1595                 if (subs->transfer_done >= runtime->period_size) {
1596                         subs->transfer_done -= runtime->period_size;
1597                         subs->frame_limit = 0;
1598                         period_elapsed = 1;
1599                         if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1600                                 if (subs->transfer_done > 0) {
1601                                         /* FIXME: fill-max mode is not
1602                                          * supported yet */
1603                                         frames -= subs->transfer_done;
1604                                         counts -= subs->transfer_done;
1605                                         urb->iso_frame_desc[i].length =
1606                                                 counts * ep->stride;
1607                                         subs->transfer_done = 0;
1608                                 }
1609                                 i++;
1610                                 if (i < ctx->packets) {
1611                                         /* add a transfer delimiter */
1612                                         urb->iso_frame_desc[i].offset =
1613                                                 frames * ep->stride;
1614                                         urb->iso_frame_desc[i].length = 0;
1615                                         urb->number_of_packets++;
1616                                 }
1617                                 break;
1618                         }
1619                 }
1620                 /* finish at the period boundary or after enough frames */
1621                 if ((period_elapsed ||
1622                                 subs->transfer_done >= subs->frame_limit) &&
1623                     !snd_usb_endpoint_implicit_feedback_sink(ep))
1624                         break;
1625         }
1626         bytes = frames * ep->stride;
1627
1628         if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1629                      subs->cur_audiofmt->dsd_dop)) {
1630                 fill_playback_urb_dsd_dop(subs, urb, bytes);
1631         } else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1632                            subs->cur_audiofmt->dsd_bitrev)) {
1633                 /* bit-reverse the bytes */
1634                 u8 *buf = urb->transfer_buffer;
1635                 for (i = 0; i < bytes; i++) {
1636                         int idx = (subs->hwptr_done + i)
1637                                 % (runtime->buffer_size * stride);
1638                         buf[i] = bitrev8(runtime->dma_area[idx]);
1639                 }
1640
1641                 subs->hwptr_done += bytes;
1642                 if (subs->hwptr_done >= runtime->buffer_size * stride)
1643                         subs->hwptr_done -= runtime->buffer_size * stride;
1644         } else {
1645                 /* usual PCM */
1646                 if (!subs->tx_length_quirk)
1647                         copy_to_urb(subs, urb, 0, stride, bytes);
1648                 else
1649                         bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1650                         /* bytes is now amount of outgoing data */
1651         }
1652
1653         /* update delay with exact number of samples queued */
1654         runtime->delay = subs->last_delay;
1655         runtime->delay += frames;
1656         subs->last_delay = runtime->delay;
1657
1658         /* realign last_frame_number */
1659         subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1660         subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1661
1662         if (subs->trigger_tstamp_pending_update) {
1663                 /* this is the first actual URB submitted,
1664                  * update trigger timestamp to reflect actual start time
1665                  */
1666                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1667                 subs->trigger_tstamp_pending_update = false;
1668         }
1669
1670         spin_unlock_irqrestore(&subs->lock, flags);
1671         urb->transfer_buffer_length = bytes;
1672         if (period_elapsed)
1673                 snd_pcm_period_elapsed(subs->pcm_substream);
1674 }
1675
1676 /*
1677  * process after playback data complete
1678  * - decrease the delay count again
1679  */
1680 static void retire_playback_urb(struct snd_usb_substream *subs,
1681                                struct urb *urb)
1682 {
1683         unsigned long flags;
1684         struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1685         struct snd_usb_endpoint *ep = subs->data_endpoint;
1686         int processed = urb->transfer_buffer_length / ep->stride;
1687         int est_delay;
1688
1689         /* ignore the delay accounting when procssed=0 is given, i.e.
1690          * silent payloads are procssed before handling the actual data
1691          */
1692         if (!processed)
1693                 return;
1694
1695         spin_lock_irqsave(&subs->lock, flags);
1696         if (!subs->last_delay)
1697                 goto out; /* short path */
1698
1699         est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1700         /* update delay with exact number of samples played */
1701         if (processed > subs->last_delay)
1702                 subs->last_delay = 0;
1703         else
1704                 subs->last_delay -= processed;
1705         runtime->delay = subs->last_delay;
1706
1707         /*
1708          * Report when delay estimate is off by more than 2ms.
1709          * The error should be lower than 2ms since the estimate relies
1710          * on two reads of a counter updated every ms.
1711          */
1712         if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1713                 dev_dbg_ratelimited(&subs->dev->dev,
1714                         "delay: estimated %d, actual %d\n",
1715                         est_delay, subs->last_delay);
1716
1717         if (!subs->running) {
1718                 /* update last_frame_number for delay counting here since
1719                  * prepare_playback_urb won't be called during pause
1720                  */
1721                 subs->last_frame_number =
1722                         usb_get_current_frame_number(subs->dev) & 0xff;
1723         }
1724
1725  out:
1726         spin_unlock_irqrestore(&subs->lock, flags);
1727 }
1728
1729 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1730                                               int cmd)
1731 {
1732         struct snd_usb_substream *subs = substream->runtime->private_data;
1733
1734         switch (cmd) {
1735         case SNDRV_PCM_TRIGGER_START:
1736                 subs->trigger_tstamp_pending_update = true;
1737                 /* fall through */
1738         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1739                 subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1740                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1741                 subs->running = 1;
1742                 return 0;
1743         case SNDRV_PCM_TRIGGER_STOP:
1744                 stop_endpoints(subs, false);
1745                 subs->running = 0;
1746                 return 0;
1747         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1748                 subs->data_endpoint->prepare_data_urb = NULL;
1749                 /* keep retire_data_urb for delay calculation */
1750                 subs->data_endpoint->retire_data_urb = retire_playback_urb;
1751                 subs->running = 0;
1752                 return 0;
1753         case SNDRV_PCM_TRIGGER_SUSPEND:
1754                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1755                         stop_endpoints(subs, true);
1756                         subs->need_setup_fmt = true;
1757                         return 0;
1758                 }
1759                 break;
1760         }
1761
1762         return -EINVAL;
1763 }
1764
1765 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1766                                              int cmd)
1767 {
1768         int err;
1769         struct snd_usb_substream *subs = substream->runtime->private_data;
1770
1771         switch (cmd) {
1772         case SNDRV_PCM_TRIGGER_START:
1773                 err = start_endpoints(subs);
1774                 if (err < 0)
1775                         return err;
1776
1777                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1778                 subs->running = 1;
1779                 return 0;
1780         case SNDRV_PCM_TRIGGER_STOP:
1781                 stop_endpoints(subs, false);
1782                 subs->data_endpoint->retire_data_urb = NULL;
1783                 subs->running = 0;
1784                 return 0;
1785         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1786                 subs->data_endpoint->retire_data_urb = NULL;
1787                 subs->running = 0;
1788                 return 0;
1789         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1790                 subs->data_endpoint->retire_data_urb = retire_capture_urb;
1791                 subs->running = 1;
1792                 return 0;
1793         case SNDRV_PCM_TRIGGER_SUSPEND:
1794                 if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1795                         stop_endpoints(subs, true);
1796                         subs->need_setup_fmt = true;
1797                         return 0;
1798                 }
1799                 break;
1800         }
1801
1802         return -EINVAL;
1803 }
1804
1805 static const struct snd_pcm_ops snd_usb_playback_ops = {
1806         .open =         snd_usb_pcm_open,
1807         .close =        snd_usb_pcm_close,
1808         .ioctl =        snd_pcm_lib_ioctl,
1809         .hw_params =    snd_usb_hw_params,
1810         .hw_free =      snd_usb_hw_free,
1811         .prepare =      snd_usb_pcm_prepare,
1812         .trigger =      snd_usb_substream_playback_trigger,
1813         .pointer =      snd_usb_pcm_pointer,
1814         .page =         snd_pcm_lib_get_vmalloc_page,
1815 };
1816
1817 static const struct snd_pcm_ops snd_usb_capture_ops = {
1818         .open =         snd_usb_pcm_open,
1819         .close =        snd_usb_pcm_close,
1820         .ioctl =        snd_pcm_lib_ioctl,
1821         .hw_params =    snd_usb_hw_params,
1822         .hw_free =      snd_usb_hw_free,
1823         .prepare =      snd_usb_pcm_prepare,
1824         .trigger =      snd_usb_substream_capture_trigger,
1825         .pointer =      snd_usb_pcm_pointer,
1826         .page =         snd_pcm_lib_get_vmalloc_page,
1827 };
1828
1829 static const struct snd_pcm_ops snd_usb_playback_dev_ops = {
1830         .open =         snd_usb_pcm_open,
1831         .close =        snd_usb_pcm_close,
1832         .ioctl =        snd_pcm_lib_ioctl,
1833         .hw_params =    snd_usb_hw_params,
1834         .hw_free =      snd_usb_hw_free,
1835         .prepare =      snd_usb_pcm_prepare,
1836         .trigger =      snd_usb_substream_playback_trigger,
1837         .pointer =      snd_usb_pcm_pointer,
1838         .page =         snd_pcm_sgbuf_ops_page,
1839 };
1840
1841 static const struct snd_pcm_ops snd_usb_capture_dev_ops = {
1842         .open =         snd_usb_pcm_open,
1843         .close =        snd_usb_pcm_close,
1844         .ioctl =        snd_pcm_lib_ioctl,
1845         .hw_params =    snd_usb_hw_params,
1846         .hw_free =      snd_usb_hw_free,
1847         .prepare =      snd_usb_pcm_prepare,
1848         .trigger =      snd_usb_substream_capture_trigger,
1849         .pointer =      snd_usb_pcm_pointer,
1850         .page =         snd_pcm_sgbuf_ops_page,
1851 };
1852
1853 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1854 {
1855         const struct snd_pcm_ops *ops;
1856
1857         if (snd_usb_use_vmalloc)
1858                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1859                         &snd_usb_playback_ops : &snd_usb_capture_ops;
1860         else
1861                 ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1862                         &snd_usb_playback_dev_ops : &snd_usb_capture_dev_ops;
1863         snd_pcm_set_ops(pcm, stream, ops);
1864 }
1865
1866 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1867 {
1868         struct snd_pcm *pcm = subs->stream->pcm;
1869         struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1870         struct device *dev = subs->dev->bus->controller;
1871
1872         if (!snd_usb_use_vmalloc)
1873                 snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,
1874                                               dev, 64*1024, 512*1024);
1875 }