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         default:
 177                 return init_pitch_v1(chip, iface, alts, fmt);
 178
 179         case UAC_VERSION_2:
 180                 return init_pitch_v2(chip, iface, alts, fmt);
 181         }
 182 }
 183
 184 /*
 185  * find a matching format and set up the interface
 186  */
 187 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 188 {
 189         struct usb_device *dev = subs->dev;
 190         struct usb_host_interface *alts;
 191         struct usb_interface_descriptor *altsd;
 192         struct usb_interface *iface;
 193         unsigned int ep, attr;
 194         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 195         int err;
 196
 197         iface = usb_ifnum_to_if(dev, fmt->iface);
 198         if (WARN_ON(!iface))
 199                 return -EINVAL;
 200         alts = &iface->altsetting[fmt->altset_idx];
 201         altsd = get_iface_desc(alts);
 202         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 203                 return -EINVAL;
 204
 205         if (fmt == subs->cur_audiofmt)
 206                 return 0;
 207
 208         /* close the old interface */
 209         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 210                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 211                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 212                                 dev->devnum, fmt->iface, fmt->altsetting);
 213                         return -EIO;
 214                 }
 215                 subs->interface = -1;
 216                 subs->altset_idx = 0;
 217         }
 218
 219         /* set interface */
 220         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 221                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 222                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 223                                    dev->devnum, fmt->iface, fmt->altsetting);
 224                         return -EIO;
 225                 }
 226                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 227                 subs->interface = fmt->iface;
 228                 subs->altset_idx = fmt->altset_idx;
 229         }
 230
 231         /* create a data pipe */
 232         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 233         if (is_playback)
 234                 subs->datapipe = usb_sndisocpipe(dev, ep);
 235         else
 236                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 237         subs->datainterval = fmt->datainterval;
 238         subs->syncpipe = subs->syncinterval = 0;
 239         subs->maxpacksize = fmt->maxpacksize;
 240         subs->fill_max = 0;
 241
 242         /* we need a sync pipe in async OUT or adaptive IN mode */
 243         /* check the number of EP, since some devices have broken
 244          * descriptors which fool us.  if it has only one EP,
 245          * assume it as adaptive-out or sync-in.
 246          */
 247         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 248         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 249              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 250             altsd->bNumEndpoints >= 2) {
 251                 /* check sync-pipe endpoint */
 252                 /* ... and check descriptor size before accessing bSynchAddress
 253                    because there is a version of the SB Audigy 2 NX firmware lacking
 254                    the audio fields in the endpoint descriptors */
 255                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 256                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 257                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 258                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 259                                    dev->devnum, fmt->iface, fmt->altsetting);
 260                         return -EINVAL;
 261                 }
 262                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 263                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 264                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 265                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 266                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 267                                    dev->devnum, fmt->iface, fmt->altsetting);
 268                         return -EINVAL;
 269                 }
 270                 ep &= USB_ENDPOINT_NUMBER_MASK;
 271                 if (is_playback)
 272                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 273                 else
 274                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 275                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 276                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 277                     get_endpoint(alts, 1)->bRefresh <= 9)
 278                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 279                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 280                         subs->syncinterval = 1;
 281                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 282                          get_endpoint(alts, 1)->bInterval <= 16)
 283                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 284                 else
 285                         subs->syncinterval = 3;
 286         }
 287
 288         /* always fill max packet size */
 289         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 290                 subs->fill_max = 1;
 291
 292         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 293                 return err;
 294
 295         subs->cur_audiofmt = fmt;
 296
 297         snd_usb_set_format_quirk(subs, fmt);
 298
 299 #if 0
 300         printk(KERN_DEBUG
 301                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 302                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 303         printk(KERN_DEBUG
 304                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 305                subs->datapipe, subs->syncpipe);
 306 #endif
 307
 308         return 0;
 309 }
 310
 311 /*
 312  * hw_params callback
 313  *
 314  * allocate a buffer and set the given audio format.
 315  *
 316  * so far we use a physically linear buffer although packetize transfer
 317  * doesn't need a continuous area.
 318  * if sg buffer is supported on the later version of alsa, we'll follow
 319  * that.
 320  */
 321 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 322                              struct snd_pcm_hw_params *hw_params)
 323 {
 324         struct snd_usb_substream *subs = substream->runtime->private_data;
 325         struct audioformat *fmt;
 326         unsigned int channels, rate, format;
 327         int ret, changed;
 328
 329         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 330                                                params_buffer_bytes(hw_params));
 331         if (ret < 0)
 332                 return ret;
 333
 334         format = params_format(hw_params);
 335         rate = params_rate(hw_params);
 336         channels = params_channels(hw_params);
 337         fmt = find_format(subs, format, rate, channels);
 338         if (!fmt) {
 339                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 340                            format, rate, channels);
 341                 return -EINVAL;
 342         }
 343
 344         changed = subs->cur_audiofmt != fmt ||
 345                 subs->period_bytes != params_period_bytes(hw_params) ||
 346                 subs->cur_rate != rate;
 347         if ((ret = set_format(subs, fmt)) < 0)
 348                 return ret;
 349
 350         if (subs->cur_rate != rate) {
 351                 struct usb_host_interface *alts;
 352                 struct usb_interface *iface;
 353                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 354                 alts = &iface->altsetting[fmt->altset_idx];
 355                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 356                 if (ret < 0)
 357                         return ret;
 358                 subs->cur_rate = rate;
 359         }
 360
 361         if (changed) {
 362                 /* format changed */
 363                 snd_usb_release_substream_urbs(subs, 0);
 364                 /* influenced: period_bytes, channels, rate, format, */
 365                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 366                                                   params_rate(hw_params),
 367                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 368                                                         params_channels(hw_params));
 369         }
 370
 371         return ret;
 372 }
 373
 374 /*
 375  * hw_free callback
 376  *
 377  * reset the audio format and release the buffer
 378  */
 379 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 380 {
 381         struct snd_usb_substream *subs = substream->runtime->private_data;
 382
 383         subs->cur_audiofmt = NULL;
 384         subs->cur_rate = 0;
 385         subs->period_bytes = 0;
 386         if (!subs->stream->chip->shutdown)
 387                 snd_usb_release_substream_urbs(subs, 0);
 388         return snd_pcm_lib_free_vmalloc_buffer(substream);
 389 }
 390
 391 /*
 392  * prepare callback
 393  *
 394  * only a few subtle things...
 395  */
 396 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 397 {
 398         struct snd_pcm_runtime *runtime = substream->runtime;
 399         struct snd_usb_substream *subs = runtime->private_data;
 400
 401         if (! subs->cur_audiofmt) {
 402                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 403                 return -ENXIO;
 404         }
 405
 406         /* some unit conversions in runtime */
 407         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 408         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 409
 410         /* reset the pointer */
 411         subs->hwptr_done = 0;
 412         subs->transfer_done = 0;
 413         subs->phase = 0;
 414         runtime->delay = 0;
 415
 416         return snd_usb_substream_prepare(subs, runtime);
 417 }
 418
 419 static struct snd_pcm_hardware snd_usb_hardware =
 420 {
 421         .info =                 SNDRV_PCM_INFO_MMAP |
 422                                 SNDRV_PCM_INFO_MMAP_VALID |
 423                                 SNDRV_PCM_INFO_BATCH |
 424                                 SNDRV_PCM_INFO_INTERLEAVED |
 425                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 426                                 SNDRV_PCM_INFO_PAUSE,
 427         .buffer_bytes_max =     1024 * 1024,
 428         .period_bytes_min =     64,
 429         .period_bytes_max =     512 * 1024,
 430         .periods_min =          2,
 431         .periods_max =          1024,
 432 };
 433
 434 static int hw_check_valid_format(struct snd_usb_substream *subs,
 435                                  struct snd_pcm_hw_params *params,
 436                                  struct audioformat *fp)
 437 {
 438         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 439         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 440         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 441         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 442         struct snd_mask check_fmts;
 443         unsigned int ptime;
 444
 445         /* check the format */
 446         snd_mask_none(&check_fmts);
 447         check_fmts.bits[0] = (u32)fp->formats;
 448         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 449         snd_mask_intersect(&check_fmts, fmts);
 450         if (snd_mask_empty(&check_fmts)) {
 451                 hwc_debug("   > check: no supported format %d\n", fp->format);
 452                 return 0;
 453         }
 454         /* check the channels */
 455         if (fp->channels < ct->min || fp->channels > ct->max) {
 456                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 457                 return 0;
 458         }
 459         /* check the rate is within the range */
 460         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 461                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 462                 return 0;
 463         }
 464         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 465                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 466                 return 0;
 467         }
 468         /* check whether the period time is >= the data packet interval */
 469         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
 470                 ptime = 125 * (1 << fp->datainterval);
 471                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 472                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 473                         return 0;
 474                 }
 475         }
 476         return 1;
 477 }
 478
 479 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 480                         struct snd_pcm_hw_rule *rule)
 481 {
 482         struct snd_usb_substream *subs = rule->private;
 483         struct list_head *p;
 484         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 485         unsigned int rmin, rmax;
 486         int changed;
 487
 488         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 489         changed = 0;
 490         rmin = rmax = 0;
 491         list_for_each(p, &subs->fmt_list) {
 492                 struct audioformat *fp;
 493                 fp = list_entry(p, struct audioformat, list);
 494                 if (!hw_check_valid_format(subs, params, fp))
 495                         continue;
 496                 if (changed++) {
 497                         if (rmin > fp->rate_min)
 498                                 rmin = fp->rate_min;
 499                         if (rmax < fp->rate_max)
 500                                 rmax = fp->rate_max;
 501                 } else {
 502                         rmin = fp->rate_min;
 503                         rmax = fp->rate_max;
 504                 }
 505         }
 506
 507         if (!changed) {
 508                 hwc_debug("  --> get empty\n");
 509                 it->empty = 1;
 510                 return -EINVAL;
 511         }
 512
 513         changed = 0;
 514         if (it->min < rmin) {
 515                 it->min = rmin;
 516                 it->openmin = 0;
 517                 changed = 1;
 518         }
 519         if (it->max > rmax) {
 520                 it->max = rmax;
 521                 it->openmax = 0;
 522                 changed = 1;
 523         }
 524         if (snd_interval_checkempty(it)) {
 525                 it->empty = 1;
 526                 return -EINVAL;
 527         }
 528         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 529         return changed;
 530 }
 531
 532
 533 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 534                             struct snd_pcm_hw_rule *rule)
 535 {
 536         struct snd_usb_substream *subs = rule->private;
 537         struct list_head *p;
 538         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 539         unsigned int rmin, rmax;
 540         int changed;
 541
 542         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 543         changed = 0;
 544         rmin = rmax = 0;
 545         list_for_each(p, &subs->fmt_list) {
 546                 struct audioformat *fp;
 547                 fp = list_entry(p, struct audioformat, list);
 548                 if (!hw_check_valid_format(subs, params, fp))
 549                         continue;
 550                 if (changed++) {
 551                         if (rmin > fp->channels)
 552                                 rmin = fp->channels;
 553                         if (rmax < fp->channels)
 554                                 rmax = fp->channels;
 555                 } else {
 556                         rmin = fp->channels;
 557                         rmax = fp->channels;
 558                 }
 559         }
 560
 561         if (!changed) {
 562                 hwc_debug("  --> get empty\n");
 563                 it->empty = 1;
 564                 return -EINVAL;
 565         }
 566
 567         changed = 0;
 568         if (it->min < rmin) {
 569                 it->min = rmin;
 570                 it->openmin = 0;
 571                 changed = 1;
 572         }
 573         if (it->max > rmax) {
 574                 it->max = rmax;
 575                 it->openmax = 0;
 576                 changed = 1;
 577         }
 578         if (snd_interval_checkempty(it)) {
 579                 it->empty = 1;
 580                 return -EINVAL;
 581         }
 582         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 583         return changed;
 584 }
 585
 586 static int hw_rule_format(struct snd_pcm_hw_params *params,
 587                           struct snd_pcm_hw_rule *rule)
 588 {
 589         struct snd_usb_substream *subs = rule->private;
 590         struct list_head *p;
 591         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 592         u64 fbits;
 593         u32 oldbits[2];
 594         int changed;
 595
 596         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 597         fbits = 0;
 598         list_for_each(p, &subs->fmt_list) {
 599                 struct audioformat *fp;
 600                 fp = list_entry(p, struct audioformat, list);
 601                 if (!hw_check_valid_format(subs, params, fp))
 602                         continue;
 603                 fbits |= fp->formats;
 604         }
 605
 606         oldbits[0] = fmt->bits[0];
 607         oldbits[1] = fmt->bits[1];
 608         fmt->bits[0] &= (u32)fbits;
 609         fmt->bits[1] &= (u32)(fbits >> 32);
 610         if (!fmt->bits[0] && !fmt->bits[1]) {
 611                 hwc_debug("  --> get empty\n");
 612                 return -EINVAL;
 613         }
 614         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 615         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 616         return changed;
 617 }
 618
 619 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 620                                struct snd_pcm_hw_rule *rule)
 621 {
 622         struct snd_usb_substream *subs = rule->private;
 623         struct audioformat *fp;
 624         struct snd_interval *it;
 625         unsigned char min_datainterval;
 626         unsigned int pmin;
 627         int changed;
 628
 629         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 630         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 631         min_datainterval = 0xff;
 632         list_for_each_entry(fp, &subs->fmt_list, list) {
 633                 if (!hw_check_valid_format(subs, params, fp))
 634                         continue;
 635                 min_datainterval = min(min_datainterval, fp->datainterval);
 636         }
 637         if (min_datainterval == 0xff) {
 638                 hwc_debug("  --> get empty\n");
 639                 it->empty = 1;
 640                 return -EINVAL;
 641         }
 642         pmin = 125 * (1 << min_datainterval);
 643         changed = 0;
 644         if (it->min < pmin) {
 645                 it->min = pmin;
 646                 it->openmin = 0;
 647                 changed = 1;
 648         }
 649         if (snd_interval_checkempty(it)) {
 650                 it->empty = 1;
 651                 return -EINVAL;
 652         }
 653         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 654         return changed;
 655 }
 656
 657 /*
 658  *  If the device supports unusual bit rates, does the request meet these?
 659  */
 660 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 661                                   struct snd_usb_substream *subs)
 662 {
 663         struct audioformat *fp;
 664         int count = 0, needs_knot = 0;
 665         int err;
 666
 667         list_for_each_entry(fp, &subs->fmt_list, list) {
 668                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 669                         return 0;
 670                 count += fp->nr_rates;
 671                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 672                         needs_knot = 1;
 673         }
 674         if (!needs_knot)
 675                 return 0;
 676
 677         subs->rate_list.count = count;
 678         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 679         subs->rate_list.mask = 0;
 680         count = 0;
 681         list_for_each_entry(fp, &subs->fmt_list, list) {
 682                 int i;
 683                 for (i = 0; i < fp->nr_rates; i++)
 684                         subs->rate_list.list[count++] = fp->rate_table[i];
 685         }
 686         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 687                                          &subs->rate_list);
 688         if (err < 0)
 689                 return err;
 690
 691         return 0;
 692 }
 693
 694
 695 /*
 696  * set up the runtime hardware information.
 697  */
 698
 699 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 700 {
 701         struct list_head *p;
 702         unsigned int pt, ptmin;
 703         int param_period_time_if_needed;
 704         int err;
 705
 706         runtime->hw.formats = subs->formats;
 707
 708         runtime->hw.rate_min = 0x7fffffff;
 709         runtime->hw.rate_max = 0;
 710         runtime->hw.channels_min = 256;
 711         runtime->hw.channels_max = 0;
 712         runtime->hw.rates = 0;
 713         ptmin = UINT_MAX;
 714         /* check min/max rates and channels */
 715         list_for_each(p, &subs->fmt_list) {
 716                 struct audioformat *fp;
 717                 fp = list_entry(p, struct audioformat, list);
 718                 runtime->hw.rates |= fp->rates;
 719                 if (runtime->hw.rate_min > fp->rate_min)
 720                         runtime->hw.rate_min = fp->rate_min;
 721                 if (runtime->hw.rate_max < fp->rate_max)
 722                         runtime->hw.rate_max = fp->rate_max;
 723                 if (runtime->hw.channels_min > fp->channels)
 724                         runtime->hw.channels_min = fp->channels;
 725                 if (runtime->hw.channels_max < fp->channels)
 726                         runtime->hw.channels_max = fp->channels;
 727                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 728                         /* FIXME: there might be more than one audio formats... */
 729                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 730                                 fp->frame_size;
 731                 }
 732                 pt = 125 * (1 << fp->datainterval);
 733                 ptmin = min(ptmin, pt);
 734         }
 735
 736         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 737         if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
 738                 /* full speed devices have fixed data packet interval */
 739                 ptmin = 1000;
 740         if (ptmin == 1000)
 741                 /* if period time doesn't go below 1 ms, no rules needed */
 742                 param_period_time_if_needed = -1;
 743         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 744                                      ptmin, UINT_MAX);
 745
 746         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 747                                        hw_rule_rate, subs,
 748                                        SNDRV_PCM_HW_PARAM_FORMAT,
 749                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 750                                        param_period_time_if_needed,
 751                                        -1)) < 0)
 752                 return err;
 753         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 754                                        hw_rule_channels, subs,
 755                                        SNDRV_PCM_HW_PARAM_FORMAT,
 756                                        SNDRV_PCM_HW_PARAM_RATE,
 757                                        param_period_time_if_needed,
 758                                        -1)) < 0)
 759                 return err;
 760         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 761                                        hw_rule_format, subs,
 762                                        SNDRV_PCM_HW_PARAM_RATE,
 763                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 764                                        param_period_time_if_needed,
 765                                        -1)) < 0)
 766                 return err;
 767         if (param_period_time_if_needed >= 0) {
 768                 err = snd_pcm_hw_rule_add(runtime, 0,
 769                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 770                                           hw_rule_period_time, subs,
 771                                           SNDRV_PCM_HW_PARAM_FORMAT,
 772                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 773                                           SNDRV_PCM_HW_PARAM_RATE,
 774                                           -1);
 775                 if (err < 0)
 776                         return err;
 777         }
 778         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 779                 return err;
 780         return 0;
 781 }
 782
 783 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 784 {
 785         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 786         struct snd_pcm_runtime *runtime = substream->runtime;
 787         struct snd_usb_substream *subs = &as->substream[direction];
 788
 789         subs->interface = -1;
 790         subs->altset_idx = 0;
 791         runtime->hw = snd_usb_hardware;
 792         runtime->private_data = subs;
 793         subs->pcm_substream = substream;
 794         return setup_hw_info(runtime, subs);
 795 }
 796
 797 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 798 {
 799         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 800         struct snd_usb_substream *subs = &as->substream[direction];
 801
 802         if (!as->chip->shutdown && subs->interface >= 0) {
 803                 usb_set_interface(subs->dev, subs->interface, 0);
 804                 subs->interface = -1;
 805         }
 806         subs->pcm_substream = NULL;
 807         return 0;
 808 }
 809
 810 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 811 {
 812         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 813 }
 814
 815 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 816 {
 817         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 818 }
 819
 820 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 821 {
 822         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 823 }
 824
 825 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 826 {
 827         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 828 }
 829
 830 static struct snd_pcm_ops snd_usb_playback_ops = {
 831         .open =         snd_usb_playback_open,
 832         .close =        snd_usb_playback_close,
 833         .ioctl =        snd_pcm_lib_ioctl,
 834         .hw_params =    snd_usb_hw_params,
 835         .hw_free =      snd_usb_hw_free,
 836         .prepare =      snd_usb_pcm_prepare,
 837         .trigger =      snd_usb_substream_playback_trigger,
 838         .pointer =      snd_usb_pcm_pointer,
 839         .page =         snd_pcm_lib_get_vmalloc_page,
 840         .mmap =         snd_pcm_lib_mmap_vmalloc,
 841 };
 842
 843 static struct snd_pcm_ops snd_usb_capture_ops = {
 844         .open =         snd_usb_capture_open,
 845         .close =        snd_usb_capture_close,
 846         .ioctl =        snd_pcm_lib_ioctl,
 847         .hw_params =    snd_usb_hw_params,
 848         .hw_free =      snd_usb_hw_free,
 849         .prepare =      snd_usb_pcm_prepare,
 850         .trigger =      snd_usb_substream_capture_trigger,
 851         .pointer =      snd_usb_pcm_pointer,
 852         .page =         snd_pcm_lib_get_vmalloc_page,
 853         .mmap =         snd_pcm_lib_mmap_vmalloc,
 854 };
 855
 856 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 857 {
 858         snd_pcm_set_ops(pcm, stream,
 859                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 860                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 861 }