sound/usb/pcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/audio.h>
  21 #include <linux/usb/audio-v2.h>
  22
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26
  27 #include "usbaudio.h"
  28 #include "card.h"
  29 #include "quirks.h"
  30 #include "debug.h"
  31 #include "urb.h"
  32 #include "helper.h"
  33 #include "pcm.h"
  34 #include "clock.h"
  35
  36 /*
  37  * return the current pcm pointer.  just based on the hwptr_done value.
  38  */
  39 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  40 {
  41         struct snd_usb_substream *subs;
  42         unsigned int hwptr_done;
  43
  44         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  45         spin_lock(&subs->lock);
  46         hwptr_done = subs->hwptr_done;
  47         spin_unlock(&subs->lock);
  48         return hwptr_done / (substream->runtime->frame_bits >> 3);
  49 }
  50
  51 /*
  52  * find a matching audio format
  53  */
  54 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  55                                        unsigned int rate, unsigned int channels)
  56 {
  57         struct list_head *p;
  58         struct audioformat *found = NULL;
  59         int cur_attr = 0, attr;
  60
  61         list_for_each(p, &subs->fmt_list) {
  62                 struct audioformat *fp;
  63                 fp = list_entry(p, struct audioformat, list);
  64                 if (!(fp->formats & (1uLL << format)))
  65                         continue;
  66                 if (fp->channels != channels)
  67                         continue;
  68                 if (rate < fp->rate_min || rate > fp->rate_max)
  69                         continue;
  70                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  71                         unsigned int i;
  72                         for (i = 0; i < fp->nr_rates; i++)
  73                                 if (fp->rate_table[i] == rate)
  74                                         break;
  75                         if (i >= fp->nr_rates)
  76                                 continue;
  77                 }
  78                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  79                 if (! found) {
  80                         found = fp;
  81                         cur_attr = attr;
  82                         continue;
  83                 }
  84                 /* avoid async out and adaptive in if the other method
  85                  * supports the same format.
  86                  * this is a workaround for the case like
  87                  * M-audio audiophile USB.
  88                  */
  89                 if (attr != cur_attr) {
  90                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  91                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  92                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  93                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  94                                 continue;
  95                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  96                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  97                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  98                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
  99                                 found = fp;
 100                                 cur_attr = attr;
 101                                 continue;
 102                         }
 103                 }
 104                 /* find the format with the largest max. packet size */
 105                 if (fp->maxpacksize > found->maxpacksize) {
 106                         found = fp;
 107                         cur_attr = attr;
 108                 }
 109         }
 110         return found;
 111 }
 112
 113 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 114                          struct usb_host_interface *alts,
 115                          struct audioformat *fmt)
 116 {
 117         struct usb_device *dev = chip->dev;
 118         unsigned int ep;
 119         unsigned char data[1];
 120         int err;
 121
 122         ep = get_endpoint(alts, 0)->bEndpointAddress;
 123
 124         data[0] = 1;
 125         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 126                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 127                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 128                                    data, sizeof(data), 1000)) < 0) {
 129                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 130                            dev->devnum, iface, ep);
 131                 return err;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 138                          struct usb_host_interface *alts,
 139                          struct audioformat *fmt)
 140 {
 141         struct usb_device *dev = chip->dev;
 142         unsigned char data[1];
 143         unsigned int ep;
 144         int err;
 145
 146         ep = get_endpoint(alts, 0)->bEndpointAddress;
 147
 148         data[0] = 1;
 149         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 150                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 151                                    UAC2_EP_CS_PITCH << 8, 0,
 152                                    data, sizeof(data), 1000)) < 0) {
 153                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 154                            dev->devnum, iface, fmt->altsetting);
 155                 return err;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /*
 162  * initialize the pitch control and sample rate
 163  */
 164 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 165                        struct usb_host_interface *alts,
 166                        struct audioformat *fmt)
 167 {
 168         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 169
 170         /* if endpoint doesn't have pitch control, bail out */
 171         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 172                 return 0;
 173
 174         switch (altsd->bInterfaceProtocol) {
 175         case UAC_VERSION_1:
 176                 return init_pitch_v1(chip, iface, alts, fmt);
 177
 178         case UAC_VERSION_2:
 179                 return init_pitch_v2(chip, iface, alts, fmt);
 180         }
 181
 182         return -EINVAL;
 183 }
 184
 185 /*
 186  * find a matching format and set up the interface
 187  */
 188 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 189 {
 190         struct usb_device *dev = subs->dev;
 191         struct usb_host_interface *alts;
 192         struct usb_interface_descriptor *altsd;
 193         struct usb_interface *iface;
 194         unsigned int ep, attr;
 195         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 196         int err;
 197
 198         iface = usb_ifnum_to_if(dev, fmt->iface);
 199         if (WARN_ON(!iface))
 200                 return -EINVAL;
 201         alts = &iface->altsetting[fmt->altset_idx];
 202         altsd = get_iface_desc(alts);
 203         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 204                 return -EINVAL;
 205
 206         if (fmt == subs->cur_audiofmt)
 207                 return 0;
 208
 209         /* close the old interface */
 210         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 211                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 212                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 213                                 dev->devnum, fmt->iface, fmt->altsetting);
 214                         return -EIO;
 215                 }
 216                 subs->interface = -1;
 217                 subs->altset_idx = 0;
 218         }
 219
 220         /* set interface */
 221         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 222                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 223                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 224                                    dev->devnum, fmt->iface, fmt->altsetting);
 225                         return -EIO;
 226                 }
 227                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 228                 subs->interface = fmt->iface;
 229                 subs->altset_idx = fmt->altset_idx;
 230         }
 231
 232         /* create a data pipe */
 233         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 234         if (is_playback)
 235                 subs->datapipe = usb_sndisocpipe(dev, ep);
 236         else
 237                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 238         subs->datainterval = fmt->datainterval;
 239         subs->syncpipe = subs->syncinterval = 0;
 240         subs->maxpacksize = fmt->maxpacksize;
 241         subs->fill_max = 0;
 242
 243         /* we need a sync pipe in async OUT or adaptive IN mode */
 244         /* check the number of EP, since some devices have broken
 245          * descriptors which fool us.  if it has only one EP,
 246          * assume it as adaptive-out or sync-in.
 247          */
 248         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 249         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 250              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 251             altsd->bNumEndpoints >= 2) {
 252                 /* check sync-pipe endpoint */
 253                 /* ... and check descriptor size before accessing bSynchAddress
 254                    because there is a version of the SB Audigy 2 NX firmware lacking
 255                    the audio fields in the endpoint descriptors */
 256                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 257                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 258                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 259                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 260                                    dev->devnum, fmt->iface, fmt->altsetting);
 261                         return -EINVAL;
 262                 }
 263                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 264                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 265                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 266                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 267                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 268                                    dev->devnum, fmt->iface, fmt->altsetting);
 269                         return -EINVAL;
 270                 }
 271                 ep &= USB_ENDPOINT_NUMBER_MASK;
 272                 if (is_playback)
 273                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 274                 else
 275                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 276                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 277                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 278                     get_endpoint(alts, 1)->bRefresh <= 9)
 279                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 280                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 281                         subs->syncinterval = 1;
 282                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 283                          get_endpoint(alts, 1)->bInterval <= 16)
 284                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 285                 else
 286                         subs->syncinterval = 3;
 287         }
 288
 289         /* always fill max packet size */
 290         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 291                 subs->fill_max = 1;
 292
 293         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 294                 return err;
 295
 296         subs->cur_audiofmt = fmt;
 297
 298         snd_usb_set_format_quirk(subs, fmt);
 299
 300 #if 0
 301         printk(KERN_DEBUG
 302                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 303                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 304         printk(KERN_DEBUG
 305                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 306                subs->datapipe, subs->syncpipe);
 307 #endif
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * hw_params callback
 314  *
 315  * allocate a buffer and set the given audio format.
 316  *
 317  * so far we use a physically linear buffer although packetize transfer
 318  * doesn't need a continuous area.
 319  * if sg buffer is supported on the later version of alsa, we'll follow
 320  * that.
 321  */
 322 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 323                              struct snd_pcm_hw_params *hw_params)
 324 {
 325         struct snd_usb_substream *subs = substream->runtime->private_data;
 326         struct audioformat *fmt;
 327         unsigned int channels, rate, format;
 328         int ret, changed;
 329
 330         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 331                                                params_buffer_bytes(hw_params));
 332         if (ret < 0)
 333                 return ret;
 334
 335         format = params_format(hw_params);
 336         rate = params_rate(hw_params);
 337         channels = params_channels(hw_params);
 338         fmt = find_format(subs, format, rate, channels);
 339         if (!fmt) {
 340                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 341                            format, rate, channels);
 342                 return -EINVAL;
 343         }
 344
 345         changed = subs->cur_audiofmt != fmt ||
 346                 subs->period_bytes != params_period_bytes(hw_params) ||
 347                 subs->cur_rate != rate;
 348         if ((ret = set_format(subs, fmt)) < 0)
 349                 return ret;
 350
 351         if (subs->cur_rate != rate) {
 352                 struct usb_host_interface *alts;
 353                 struct usb_interface *iface;
 354                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 355                 alts = &iface->altsetting[fmt->altset_idx];
 356                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 357                 if (ret < 0)
 358                         return ret;
 359                 subs->cur_rate = rate;
 360         }
 361
 362         if (changed) {
 363                 /* format changed */
 364                 snd_usb_release_substream_urbs(subs, 0);
 365                 /* influenced: period_bytes, channels, rate, format, */
 366                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 367                                                   params_rate(hw_params),
 368                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 369                                                         params_channels(hw_params));
 370         }
 371
 372         return ret;
 373 }
 374
 375 /*
 376  * hw_free callback
 377  *
 378  * reset the audio format and release the buffer
 379  */
 380 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 381 {
 382         struct snd_usb_substream *subs = substream->runtime->private_data;
 383
 384         subs->cur_audiofmt = NULL;
 385         subs->cur_rate = 0;
 386         subs->period_bytes = 0;
 387         if (!subs->stream->chip->shutdown)
 388                 snd_usb_release_substream_urbs(subs, 0);
 389         return snd_pcm_lib_free_vmalloc_buffer(substream);
 390 }
 391
 392 /*
 393  * prepare callback
 394  *
 395  * only a few subtle things...
 396  */
 397 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 398 {
 399         struct snd_pcm_runtime *runtime = substream->runtime;
 400         struct snd_usb_substream *subs = runtime->private_data;
 401
 402         if (! subs->cur_audiofmt) {
 403                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 404                 return -ENXIO;
 405         }
 406
 407         /* some unit conversions in runtime */
 408         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 409         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 410
 411         /* reset the pointer */
 412         subs->hwptr_done = 0;
 413         subs->transfer_done = 0;
 414         subs->phase = 0;
 415         runtime->delay = 0;
 416
 417         return snd_usb_substream_prepare(subs, runtime);
 418 }
 419
 420 static struct snd_pcm_hardware snd_usb_hardware =
 421 {
 422         .info =                 SNDRV_PCM_INFO_MMAP |
 423                                 SNDRV_PCM_INFO_MMAP_VALID |
 424                                 SNDRV_PCM_INFO_BATCH |
 425                                 SNDRV_PCM_INFO_INTERLEAVED |
 426                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 427                                 SNDRV_PCM_INFO_PAUSE,
 428         .buffer_bytes_max =     1024 * 1024,
 429         .period_bytes_min =     64,
 430         .period_bytes_max =     512 * 1024,
 431         .periods_min =          2,
 432         .periods_max =          1024,
 433 };
 434
 435 static int hw_check_valid_format(struct snd_usb_substream *subs,
 436                                  struct snd_pcm_hw_params *params,
 437                                  struct audioformat *fp)
 438 {
 439         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 440         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 441         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 442         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 443         struct snd_mask check_fmts;
 444         unsigned int ptime;
 445
 446         /* check the format */
 447         snd_mask_none(&check_fmts);
 448         check_fmts.bits[0] = (u32)fp->formats;
 449         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 450         snd_mask_intersect(&check_fmts, fmts);
 451         if (snd_mask_empty(&check_fmts)) {
 452                 hwc_debug("   > check: no supported format %d\n", fp->format);
 453                 return 0;
 454         }
 455         /* check the channels */
 456         if (fp->channels < ct->min || fp->channels > ct->max) {
 457                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 458                 return 0;
 459         }
 460         /* check the rate is within the range */
 461         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 462                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 463                 return 0;
 464         }
 465         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 466                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 467                 return 0;
 468         }
 469         /* check whether the period time is >= the data packet interval */
 470         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
 471                 ptime = 125 * (1 << fp->datainterval);
 472                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 473                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 474                         return 0;
 475                 }
 476         }
 477         return 1;
 478 }
 479
 480 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 481                         struct snd_pcm_hw_rule *rule)
 482 {
 483         struct snd_usb_substream *subs = rule->private;
 484         struct list_head *p;
 485         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 486         unsigned int rmin, rmax;
 487         int changed;
 488
 489         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 490         changed = 0;
 491         rmin = rmax = 0;
 492         list_for_each(p, &subs->fmt_list) {
 493                 struct audioformat *fp;
 494                 fp = list_entry(p, struct audioformat, list);
 495                 if (!hw_check_valid_format(subs, params, fp))
 496                         continue;
 497                 if (changed++) {
 498                         if (rmin > fp->rate_min)
 499                                 rmin = fp->rate_min;
 500                         if (rmax < fp->rate_max)
 501                                 rmax = fp->rate_max;
 502                 } else {
 503                         rmin = fp->rate_min;
 504                         rmax = fp->rate_max;
 505                 }
 506         }
 507
 508         if (!changed) {
 509                 hwc_debug("  --> get empty\n");
 510                 it->empty = 1;
 511                 return -EINVAL;
 512         }
 513
 514         changed = 0;
 515         if (it->min < rmin) {
 516                 it->min = rmin;
 517                 it->openmin = 0;
 518                 changed = 1;
 519         }
 520         if (it->max > rmax) {
 521                 it->max = rmax;
 522                 it->openmax = 0;
 523                 changed = 1;
 524         }
 525         if (snd_interval_checkempty(it)) {
 526                 it->empty = 1;
 527                 return -EINVAL;
 528         }
 529         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 530         return changed;
 531 }
 532
 533
 534 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 535                             struct snd_pcm_hw_rule *rule)
 536 {
 537         struct snd_usb_substream *subs = rule->private;
 538         struct list_head *p;
 539         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 540         unsigned int rmin, rmax;
 541         int changed;
 542
 543         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 544         changed = 0;
 545         rmin = rmax = 0;
 546         list_for_each(p, &subs->fmt_list) {
 547                 struct audioformat *fp;
 548                 fp = list_entry(p, struct audioformat, list);
 549                 if (!hw_check_valid_format(subs, params, fp))
 550                         continue;
 551                 if (changed++) {
 552                         if (rmin > fp->channels)
 553                                 rmin = fp->channels;
 554                         if (rmax < fp->channels)
 555                                 rmax = fp->channels;
 556                 } else {
 557                         rmin = fp->channels;
 558                         rmax = fp->channels;
 559                 }
 560         }
 561
 562         if (!changed) {
 563                 hwc_debug("  --> get empty\n");
 564                 it->empty = 1;
 565                 return -EINVAL;
 566         }
 567
 568         changed = 0;
 569         if (it->min < rmin) {
 570                 it->min = rmin;
 571                 it->openmin = 0;
 572                 changed = 1;
 573         }
 574         if (it->max > rmax) {
 575                 it->max = rmax;
 576                 it->openmax = 0;
 577                 changed = 1;
 578         }
 579         if (snd_interval_checkempty(it)) {
 580                 it->empty = 1;
 581                 return -EINVAL;
 582         }
 583         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 584         return changed;
 585 }
 586
 587 static int hw_rule_format(struct snd_pcm_hw_params *params,
 588                           struct snd_pcm_hw_rule *rule)
 589 {
 590         struct snd_usb_substream *subs = rule->private;
 591         struct list_head *p;
 592         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 593         u64 fbits;
 594         u32 oldbits[2];
 595         int changed;
 596
 597         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 598         fbits = 0;
 599         list_for_each(p, &subs->fmt_list) {
 600                 struct audioformat *fp;
 601                 fp = list_entry(p, struct audioformat, list);
 602                 if (!hw_check_valid_format(subs, params, fp))
 603                         continue;
 604                 fbits |= fp->formats;
 605         }
 606
 607         oldbits[0] = fmt->bits[0];
 608         oldbits[1] = fmt->bits[1];
 609         fmt->bits[0] &= (u32)fbits;
 610         fmt->bits[1] &= (u32)(fbits >> 32);
 611         if (!fmt->bits[0] && !fmt->bits[1]) {
 612                 hwc_debug("  --> get empty\n");
 613                 return -EINVAL;
 614         }
 615         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 616         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 617         return changed;
 618 }
 619
 620 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 621                                struct snd_pcm_hw_rule *rule)
 622 {
 623         struct snd_usb_substream *subs = rule->private;
 624         struct audioformat *fp;
 625         struct snd_interval *it;
 626         unsigned char min_datainterval;
 627         unsigned int pmin;
 628         int changed;
 629
 630         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 631         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 632         min_datainterval = 0xff;
 633         list_for_each_entry(fp, &subs->fmt_list, list) {
 634                 if (!hw_check_valid_format(subs, params, fp))
 635                         continue;
 636                 min_datainterval = min(min_datainterval, fp->datainterval);
 637         }
 638         if (min_datainterval == 0xff) {
 639                 hwc_debug("  --> get emtpy\n");
 640                 it->empty = 1;
 641                 return -EINVAL;
 642         }
 643         pmin = 125 * (1 << min_datainterval);
 644         changed = 0;
 645         if (it->min < pmin) {
 646                 it->min = pmin;
 647                 it->openmin = 0;
 648                 changed = 1;
 649         }
 650         if (snd_interval_checkempty(it)) {
 651                 it->empty = 1;
 652                 return -EINVAL;
 653         }
 654         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 655         return changed;
 656 }
 657
 658 /*
 659  *  If the device supports unusual bit rates, does the request meet these?
 660  */
 661 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 662                                   struct snd_usb_substream *subs)
 663 {
 664         struct audioformat *fp;
 665         int count = 0, needs_knot = 0;
 666         int err;
 667
 668         list_for_each_entry(fp, &subs->fmt_list, list) {
 669                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 670                         return 0;
 671                 count += fp->nr_rates;
 672                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 673                         needs_knot = 1;
 674         }
 675         if (!needs_knot)
 676                 return 0;
 677
 678         subs->rate_list.count = count;
 679         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 680         subs->rate_list.mask = 0;
 681         count = 0;
 682         list_for_each_entry(fp, &subs->fmt_list, list) {
 683                 int i;
 684                 for (i = 0; i < fp->nr_rates; i++)
 685                         subs->rate_list.list[count++] = fp->rate_table[i];
 686         }
 687         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 688                                          &subs->rate_list);
 689         if (err < 0)
 690                 return err;
 691
 692         return 0;
 693 }
 694
 695
 696 /*
 697  * set up the runtime hardware information.
 698  */
 699
 700 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 701 {
 702         struct list_head *p;
 703         unsigned int pt, ptmin;
 704         int param_period_time_if_needed;
 705         int err;
 706
 707         runtime->hw.formats = subs->formats;
 708
 709         runtime->hw.rate_min = 0x7fffffff;
 710         runtime->hw.rate_max = 0;
 711         runtime->hw.channels_min = 256;
 712         runtime->hw.channels_max = 0;
 713         runtime->hw.rates = 0;
 714         ptmin = UINT_MAX;
 715         /* check min/max rates and channels */
 716         list_for_each(p, &subs->fmt_list) {
 717                 struct audioformat *fp;
 718                 fp = list_entry(p, struct audioformat, list);
 719                 runtime->hw.rates |= fp->rates;
 720                 if (runtime->hw.rate_min > fp->rate_min)
 721                         runtime->hw.rate_min = fp->rate_min;
 722                 if (runtime->hw.rate_max < fp->rate_max)
 723                         runtime->hw.rate_max = fp->rate_max;
 724                 if (runtime->hw.channels_min > fp->channels)
 725                         runtime->hw.channels_min = fp->channels;
 726                 if (runtime->hw.channels_max < fp->channels)
 727                         runtime->hw.channels_max = fp->channels;
 728                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 729                         /* FIXME: there might be more than one audio formats... */
 730                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 731                                 fp->frame_size;
 732                 }
 733                 pt = 125 * (1 << fp->datainterval);
 734                 ptmin = min(ptmin, pt);
 735         }
 736
 737         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 738         if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
 739                 /* full speed devices have fixed data packet interval */
 740                 ptmin = 1000;
 741         if (ptmin == 1000)
 742                 /* if period time doesn't go below 1 ms, no rules needed */
 743                 param_period_time_if_needed = -1;
 744         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 745                                      ptmin, UINT_MAX);
 746
 747         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 748                                        hw_rule_rate, subs,
 749                                        SNDRV_PCM_HW_PARAM_FORMAT,
 750                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 751                                        param_period_time_if_needed,
 752                                        -1)) < 0)
 753                 return err;
 754         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 755                                        hw_rule_channels, subs,
 756                                        SNDRV_PCM_HW_PARAM_FORMAT,
 757                                        SNDRV_PCM_HW_PARAM_RATE,
 758                                        param_period_time_if_needed,
 759                                        -1)) < 0)
 760                 return err;
 761         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 762                                        hw_rule_format, subs,
 763                                        SNDRV_PCM_HW_PARAM_RATE,
 764                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 765                                        param_period_time_if_needed,
 766                                        -1)) < 0)
 767                 return err;
 768         if (param_period_time_if_needed >= 0) {
 769                 err = snd_pcm_hw_rule_add(runtime, 0,
 770                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 771                                           hw_rule_period_time, subs,
 772                                           SNDRV_PCM_HW_PARAM_FORMAT,
 773                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 774                                           SNDRV_PCM_HW_PARAM_RATE,
 775                                           -1);
 776                 if (err < 0)
 777                         return err;
 778         }
 779         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 780                 return err;
 781         return 0;
 782 }
 783
 784 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 785 {
 786         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 787         struct snd_pcm_runtime *runtime = substream->runtime;
 788         struct snd_usb_substream *subs = &as->substream[direction];
 789
 790         subs->interface = -1;
 791         subs->altset_idx = 0;
 792         runtime->hw = snd_usb_hardware;
 793         runtime->private_data = subs;
 794         subs->pcm_substream = substream;
 795         return setup_hw_info(runtime, subs);
 796 }
 797
 798 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 799 {
 800         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 801         struct snd_usb_substream *subs = &as->substream[direction];
 802
 803         if (!as->chip->shutdown && subs->interface >= 0) {
 804                 usb_set_interface(subs->dev, subs->interface, 0);
 805                 subs->interface = -1;
 806         }
 807         subs->pcm_substream = NULL;
 808         return 0;
 809 }
 810
 811 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 812 {
 813         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 814 }
 815
 816 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 817 {
 818         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 819 }
 820
 821 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 822 {
 823         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 824 }
 825
 826 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 827 {
 828         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 829 }
 830
 831 static struct snd_pcm_ops snd_usb_playback_ops = {
 832         .open =         snd_usb_playback_open,
 833         .close =        snd_usb_playback_close,
 834         .ioctl =        snd_pcm_lib_ioctl,
 835         .hw_params =    snd_usb_hw_params,
 836         .hw_free =      snd_usb_hw_free,
 837         .prepare =      snd_usb_pcm_prepare,
 838         .trigger =      snd_usb_substream_playback_trigger,
 839         .pointer =      snd_usb_pcm_pointer,
 840         .page =         snd_pcm_lib_get_vmalloc_page,
 841         .mmap =         snd_pcm_lib_mmap_vmalloc,
 842 };
 843
 844 static struct snd_pcm_ops snd_usb_capture_ops = {
 845         .open =         snd_usb_capture_open,
 846         .close =        snd_usb_capture_close,
 847         .ioctl =        snd_pcm_lib_ioctl,
 848         .hw_params =    snd_usb_hw_params,
 849         .hw_free =      snd_usb_hw_free,
 850         .prepare =      snd_usb_pcm_prepare,
 851         .trigger =      snd_usb_substream_capture_trigger,
 852         .pointer =      snd_usb_pcm_pointer,
 853         .page =         snd_pcm_lib_get_vmalloc_page,
 854         .mmap =         snd_pcm_lib_mmap_vmalloc,
 855 };
 856
 857 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 858 {
 859         snd_pcm_set_ops(pcm, stream,
 860                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 861                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 862 }