SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/usb.h>
  19 #include <linux/usb/audio.h>
  20
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24
  25 #include "usbaudio.h"
  26 #include "card.h"
  27 #include "quirks.h"
  28 #include "debug.h"
  29 #include "urb.h"
  30 #include "helper.h"
  31 #include "pcm.h"
  32
  33 /*
  34  * return the current pcm pointer.  just based on the hwptr_done value.
  35  */
  36 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  37 {
  38         struct snd_usb_substream *subs;
  39         unsigned int hwptr_done;
  40
  41         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  42         spin_lock(&subs->lock);
  43         hwptr_done = subs->hwptr_done;
  44         spin_unlock(&subs->lock);
  45         return hwptr_done / (substream->runtime->frame_bits >> 3);
  46 }
  47
  48 /*
  49  * find a matching audio format
  50  */
  51 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  52                                        unsigned int rate, unsigned int channels)
  53 {
  54         struct list_head *p;
  55         struct audioformat *found = NULL;
  56         int cur_attr = 0, attr;
  57
  58         list_for_each(p, &subs->fmt_list) {
  59                 struct audioformat *fp;
  60                 fp = list_entry(p, struct audioformat, list);
  61                 if (fp->format != format || fp->channels != channels)
  62                         continue;
  63                 if (rate < fp->rate_min || rate > fp->rate_max)
  64                         continue;
  65                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  66                         unsigned int i;
  67                         for (i = 0; i < fp->nr_rates; i++)
  68                                 if (fp->rate_table[i] == rate)
  69                                         break;
  70                         if (i >= fp->nr_rates)
  71                                 continue;
  72                 }
  73                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  74                 if (! found) {
  75                         found = fp;
  76                         cur_attr = attr;
  77                         continue;
  78                 }
  79                 /* avoid async out and adaptive in if the other method
  80                  * supports the same format.
  81                  * this is a workaround for the case like
  82                  * M-audio audiophile USB.
  83                  */
  84                 if (attr != cur_attr) {
  85                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  86                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  87                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  88                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  89                                 continue;
  90                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  91                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  92                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  93                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
  94                                 found = fp;
  95                                 cur_attr = attr;
  96                                 continue;
  97                         }
  98                 }
  99                 /* find the format with the largest max. packet size */
 100                 if (fp->maxpacksize > found->maxpacksize) {
 101                         found = fp;
 102                         cur_attr = attr;
 103                 }
 104         }
 105         return found;
 106 }
 107
 108
 109 /*
 110  * initialize the picth control and sample rate
 111  */
 112 int snd_usb_init_pitch(struct usb_device *dev, int iface,
 113                        struct usb_host_interface *alts,
 114                        struct audioformat *fmt)
 115 {
 116         unsigned int ep;
 117         unsigned char data[1];
 118         int err;
 119
 120         ep = get_endpoint(alts, 0)->bEndpointAddress;
 121         /* if endpoint has pitch control, enable it */
 122         if (fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL) {
 123                 data[0] = 1;
 124                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 125                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 126                                            UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, data, 1, 1000)) < 0) {
 127                         snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 128                                    dev->devnum, iface, ep);
 129                         return err;
 130                 }
 131         }
 132         return 0;
 133 }
 134
 135 int snd_usb_init_sample_rate(struct usb_device *dev, int iface,
 136                              struct usb_host_interface *alts,
 137                              struct audioformat *fmt, int rate)
 138 {
 139         unsigned int ep;
 140         unsigned char data[3];
 141         int err;
 142
 143         ep = get_endpoint(alts, 0)->bEndpointAddress;
 144         /* if endpoint has sampling rate control, set it */
 145         if (fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE) {
 146                 int crate;
 147                 data[0] = rate;
 148                 data[1] = rate >> 8;
 149                 data[2] = rate >> 16;
 150                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 151                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 152                                            UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3, 1000)) < 0) {
 153                         snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
 154                                    dev->devnum, iface, fmt->altsetting, rate, ep);
 155                         return err;
 156                 }
 157                 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
 158                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
 159                                            UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep, data, 3, 1000)) < 0) {
 160                         snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
 161                                    dev->devnum, iface, fmt->altsetting, ep);
 162                         return 0; /* some devices don't support reading */
 163                 }
 164                 crate = data[0] | (data[1] << 8) | (data[2] << 16);
 165                 if (crate != rate) {
 166                         snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
 167                         // runtime->rate = crate;
 168                 }
 169         }
 170         return 0;
 171 }
 172
 173 /*
 174  * find a matching format and set up the interface
 175  */
 176 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 177 {
 178         struct usb_device *dev = subs->dev;
 179         struct usb_host_interface *alts;
 180         struct usb_interface_descriptor *altsd;
 181         struct usb_interface *iface;
 182         unsigned int ep, attr;
 183         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 184         int err;
 185
 186         iface = usb_ifnum_to_if(dev, fmt->iface);
 187         if (WARN_ON(!iface))
 188                 return -EINVAL;
 189         alts = &iface->altsetting[fmt->altset_idx];
 190         altsd = get_iface_desc(alts);
 191         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 192                 return -EINVAL;
 193
 194         if (fmt == subs->cur_audiofmt)
 195                 return 0;
 196
 197         /* close the old interface */
 198         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 199                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 200                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 201                                 dev->devnum, fmt->iface, fmt->altsetting);
 202                         return -EIO;
 203                 }
 204                 subs->interface = -1;
 205                 subs->format = 0;
 206         }
 207
 208         /* set interface */
 209         if (subs->interface != fmt->iface || subs->format != fmt->altset_idx) {
 210                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 211                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 212                                    dev->devnum, fmt->iface, fmt->altsetting);
 213                         return -EIO;
 214                 }
 215                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 216                 subs->interface = fmt->iface;
 217                 subs->format = fmt->altset_idx;
 218         }
 219
 220         /* create a data pipe */
 221         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 222         if (is_playback)
 223                 subs->datapipe = usb_sndisocpipe(dev, ep);
 224         else
 225                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 226         subs->datainterval = fmt->datainterval;
 227         subs->syncpipe = subs->syncinterval = 0;
 228         subs->maxpacksize = fmt->maxpacksize;
 229         subs->fill_max = 0;
 230
 231         /* we need a sync pipe in async OUT or adaptive IN mode */
 232         /* check the number of EP, since some devices have broken
 233          * descriptors which fool us.  if it has only one EP,
 234          * assume it as adaptive-out or sync-in.
 235          */
 236         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 237         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 238              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 239             altsd->bNumEndpoints >= 2) {
 240                 /* check sync-pipe endpoint */
 241                 /* ... and check descriptor size before accessing bSynchAddress
 242                    because there is a version of the SB Audigy 2 NX firmware lacking
 243                    the audio fields in the endpoint descriptors */
 244                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 245                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 246                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 247                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 248                                    dev->devnum, fmt->iface, fmt->altsetting);
 249                         return -EINVAL;
 250                 }
 251                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 252                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 253                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 254                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 255                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 256                                    dev->devnum, fmt->iface, fmt->altsetting);
 257                         return -EINVAL;
 258                 }
 259                 ep &= USB_ENDPOINT_NUMBER_MASK;
 260                 if (is_playback)
 261                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 262                 else
 263                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 264                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 265                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 266                     get_endpoint(alts, 1)->bRefresh <= 9)
 267                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 268                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 269                         subs->syncinterval = 1;
 270                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 271                          get_endpoint(alts, 1)->bInterval <= 16)
 272                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 273                 else
 274                         subs->syncinterval = 3;
 275         }
 276
 277         /* always fill max packet size */
 278         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 279                 subs->fill_max = 1;
 280
 281         if ((err = snd_usb_init_pitch(dev, subs->interface, alts, fmt)) < 0)
 282                 return err;
 283
 284         subs->cur_audiofmt = fmt;
 285
 286         snd_usb_set_format_quirk(subs, fmt);
 287
 288 #if 0
 289         printk(KERN_DEBUG
 290                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 291                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 292         printk(KERN_DEBUG
 293                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 294                subs->datapipe, subs->syncpipe);
 295 #endif
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * hw_params callback
 302  *
 303  * allocate a buffer and set the given audio format.
 304  *
 305  * so far we use a physically linear buffer although packetize transfer
 306  * doesn't need a continuous area.
 307  * if sg buffer is supported on the later version of alsa, we'll follow
 308  * that.
 309  */
 310 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 311                              struct snd_pcm_hw_params *hw_params)
 312 {
 313         struct snd_usb_substream *subs = substream->runtime->private_data;
 314         struct audioformat *fmt;
 315         unsigned int channels, rate, format;
 316         int ret, changed;
 317
 318         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 319                                                params_buffer_bytes(hw_params));
 320         if (ret < 0)
 321                 return ret;
 322
 323         format = params_format(hw_params);
 324         rate = params_rate(hw_params);
 325         channels = params_channels(hw_params);
 326         fmt = find_format(subs, format, rate, channels);
 327         if (!fmt) {
 328                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 329                            format, rate, channels);
 330                 return -EINVAL;
 331         }
 332
 333         changed = subs->cur_audiofmt != fmt ||
 334                 subs->period_bytes != params_period_bytes(hw_params) ||
 335                 subs->cur_rate != rate;
 336         if ((ret = set_format(subs, fmt)) < 0)
 337                 return ret;
 338
 339         if (subs->cur_rate != rate) {
 340                 struct usb_host_interface *alts;
 341                 struct usb_interface *iface;
 342                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 343                 alts = &iface->altsetting[fmt->altset_idx];
 344                 ret = snd_usb_init_sample_rate(subs->dev, subs->interface, alts, fmt, rate);
 345                 if (ret < 0)
 346                         return ret;
 347                 subs->cur_rate = rate;
 348         }
 349
 350         if (changed) {
 351                 /* format changed */
 352                 snd_usb_release_substream_urbs(subs, 0);
 353                 /* influenced: period_bytes, channels, rate, format, */
 354                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 355                                                   params_rate(hw_params),
 356                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 357                                                         params_channels(hw_params));
 358         }
 359
 360         return ret;
 361 }
 362
 363 /*
 364  * hw_free callback
 365  *
 366  * reset the audio format and release the buffer
 367  */
 368 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 369 {
 370         struct snd_usb_substream *subs = substream->runtime->private_data;
 371
 372         subs->cur_audiofmt = NULL;
 373         subs->cur_rate = 0;
 374         subs->period_bytes = 0;
 375         if (!subs->stream->chip->shutdown)
 376                 snd_usb_release_substream_urbs(subs, 0);
 377         return snd_pcm_lib_free_vmalloc_buffer(substream);
 378 }
 379
 380 /*
 381  * prepare callback
 382  *
 383  * only a few subtle things...
 384  */
 385 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 386 {
 387         struct snd_pcm_runtime *runtime = substream->runtime;
 388         struct snd_usb_substream *subs = runtime->private_data;
 389
 390         if (! subs->cur_audiofmt) {
 391                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 392                 return -ENXIO;
 393         }
 394
 395         /* some unit conversions in runtime */
 396         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 397         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 398
 399         /* reset the pointer */
 400         subs->hwptr_done = 0;
 401         subs->transfer_done = 0;
 402         subs->phase = 0;
 403         runtime->delay = 0;
 404
 405         return snd_usb_substream_prepare(subs, runtime);
 406 }
 407
 408 static struct snd_pcm_hardware snd_usb_hardware =
 409 {
 410         .info =                 SNDRV_PCM_INFO_MMAP |
 411                                 SNDRV_PCM_INFO_MMAP_VALID |
 412                                 SNDRV_PCM_INFO_BATCH |
 413                                 SNDRV_PCM_INFO_INTERLEAVED |
 414                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 415                                 SNDRV_PCM_INFO_PAUSE,
 416         .buffer_bytes_max =     1024 * 1024,
 417         .period_bytes_min =     64,
 418         .period_bytes_max =     512 * 1024,
 419         .periods_min =          2,
 420         .periods_max =          1024,
 421 };
 422
 423 static int hw_check_valid_format(struct snd_usb_substream *subs,
 424                                  struct snd_pcm_hw_params *params,
 425                                  struct audioformat *fp)
 426 {
 427         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 428         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 429         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 430         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 431         unsigned int ptime;
 432
 433         /* check the format */
 434         if (!snd_mask_test(fmts, fp->format)) {
 435                 hwc_debug("   > check: no supported format %d\n", fp->format);
 436                 return 0;
 437         }
 438         /* check the channels */
 439         if (fp->channels < ct->min || fp->channels > ct->max) {
 440                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 441                 return 0;
 442         }
 443         /* check the rate is within the range */
 444         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 445                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 446                 return 0;
 447         }
 448         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 449                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 450                 return 0;
 451         }
 452         /* check whether the period time is >= the data packet interval */
 453         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
 454                 ptime = 125 * (1 << fp->datainterval);
 455                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 456                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 457                         return 0;
 458                 }
 459         }
 460         return 1;
 461 }
 462
 463 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 464                         struct snd_pcm_hw_rule *rule)
 465 {
 466         struct snd_usb_substream *subs = rule->private;
 467         struct list_head *p;
 468         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 469         unsigned int rmin, rmax;
 470         int changed;
 471
 472         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 473         changed = 0;
 474         rmin = rmax = 0;
 475         list_for_each(p, &subs->fmt_list) {
 476                 struct audioformat *fp;
 477                 fp = list_entry(p, struct audioformat, list);
 478                 if (!hw_check_valid_format(subs, params, fp))
 479                         continue;
 480                 if (changed++) {
 481                         if (rmin > fp->rate_min)
 482                                 rmin = fp->rate_min;
 483                         if (rmax < fp->rate_max)
 484                                 rmax = fp->rate_max;
 485                 } else {
 486                         rmin = fp->rate_min;
 487                         rmax = fp->rate_max;
 488                 }
 489         }
 490
 491         if (!changed) {
 492                 hwc_debug("  --> get empty\n");
 493                 it->empty = 1;
 494                 return -EINVAL;
 495         }
 496
 497         changed = 0;
 498         if (it->min < rmin) {
 499                 it->min = rmin;
 500                 it->openmin = 0;
 501                 changed = 1;
 502         }
 503         if (it->max > rmax) {
 504                 it->max = rmax;
 505                 it->openmax = 0;
 506                 changed = 1;
 507         }
 508         if (snd_interval_checkempty(it)) {
 509                 it->empty = 1;
 510                 return -EINVAL;
 511         }
 512         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 513         return changed;
 514 }
 515
 516
 517 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 518                             struct snd_pcm_hw_rule *rule)
 519 {
 520         struct snd_usb_substream *subs = rule->private;
 521         struct list_head *p;
 522         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 523         unsigned int rmin, rmax;
 524         int changed;
 525
 526         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 527         changed = 0;
 528         rmin = rmax = 0;
 529         list_for_each(p, &subs->fmt_list) {
 530                 struct audioformat *fp;
 531                 fp = list_entry(p, struct audioformat, list);
 532                 if (!hw_check_valid_format(subs, params, fp))
 533                         continue;
 534                 if (changed++) {
 535                         if (rmin > fp->channels)
 536                                 rmin = fp->channels;
 537                         if (rmax < fp->channels)
 538                                 rmax = fp->channels;
 539                 } else {
 540                         rmin = fp->channels;
 541                         rmax = fp->channels;
 542                 }
 543         }
 544
 545         if (!changed) {
 546                 hwc_debug("  --> get empty\n");
 547                 it->empty = 1;
 548                 return -EINVAL;
 549         }
 550
 551         changed = 0;
 552         if (it->min < rmin) {
 553                 it->min = rmin;
 554                 it->openmin = 0;
 555                 changed = 1;
 556         }
 557         if (it->max > rmax) {
 558                 it->max = rmax;
 559                 it->openmax = 0;
 560                 changed = 1;
 561         }
 562         if (snd_interval_checkempty(it)) {
 563                 it->empty = 1;
 564                 return -EINVAL;
 565         }
 566         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 567         return changed;
 568 }
 569
 570 static int hw_rule_format(struct snd_pcm_hw_params *params,
 571                           struct snd_pcm_hw_rule *rule)
 572 {
 573         struct snd_usb_substream *subs = rule->private;
 574         struct list_head *p;
 575         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 576         u64 fbits;
 577         u32 oldbits[2];
 578         int changed;
 579
 580         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 581         fbits = 0;
 582         list_for_each(p, &subs->fmt_list) {
 583                 struct audioformat *fp;
 584                 fp = list_entry(p, struct audioformat, list);
 585                 if (!hw_check_valid_format(subs, params, fp))
 586                         continue;
 587                 fbits |= (1ULL << fp->format);
 588         }
 589
 590         oldbits[0] = fmt->bits[0];
 591         oldbits[1] = fmt->bits[1];
 592         fmt->bits[0] &= (u32)fbits;
 593         fmt->bits[1] &= (u32)(fbits >> 32);
 594         if (!fmt->bits[0] && !fmt->bits[1]) {
 595                 hwc_debug("  --> get empty\n");
 596                 return -EINVAL;
 597         }
 598         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 599         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 600         return changed;
 601 }
 602
 603 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 604                                struct snd_pcm_hw_rule *rule)
 605 {
 606         struct snd_usb_substream *subs = rule->private;
 607         struct audioformat *fp;
 608         struct snd_interval *it;
 609         unsigned char min_datainterval;
 610         unsigned int pmin;
 611         int changed;
 612
 613         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 614         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 615         min_datainterval = 0xff;
 616         list_for_each_entry(fp, &subs->fmt_list, list) {
 617                 if (!hw_check_valid_format(subs, params, fp))
 618                         continue;
 619                 min_datainterval = min(min_datainterval, fp->datainterval);
 620         }
 621         if (min_datainterval == 0xff) {
 622                 hwc_debug("  --> get emtpy\n");
 623                 it->empty = 1;
 624                 return -EINVAL;
 625         }
 626         pmin = 125 * (1 << min_datainterval);
 627         changed = 0;
 628         if (it->min < pmin) {
 629                 it->min = pmin;
 630                 it->openmin = 0;
 631                 changed = 1;
 632         }
 633         if (snd_interval_checkempty(it)) {
 634                 it->empty = 1;
 635                 return -EINVAL;
 636         }
 637         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 638         return changed;
 639 }
 640
 641 /*
 642  *  If the device supports unusual bit rates, does the request meet these?
 643  */
 644 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 645                                   struct snd_usb_substream *subs)
 646 {
 647         struct audioformat *fp;
 648         int count = 0, needs_knot = 0;
 649         int err;
 650
 651         list_for_each_entry(fp, &subs->fmt_list, list) {
 652                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 653                         return 0;
 654                 count += fp->nr_rates;
 655                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 656                         needs_knot = 1;
 657         }
 658         if (!needs_knot)
 659                 return 0;
 660
 661         subs->rate_list.count = count;
 662         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 663         subs->rate_list.mask = 0;
 664         count = 0;
 665         list_for_each_entry(fp, &subs->fmt_list, list) {
 666                 int i;
 667                 for (i = 0; i < fp->nr_rates; i++)
 668                         subs->rate_list.list[count++] = fp->rate_table[i];
 669         }
 670         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 671                                          &subs->rate_list);
 672         if (err < 0)
 673                 return err;
 674
 675         return 0;
 676 }
 677
 678
 679 /*
 680  * set up the runtime hardware information.
 681  */
 682
 683 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 684 {
 685         struct list_head *p;
 686         unsigned int pt, ptmin;
 687         int param_period_time_if_needed;
 688         int err;
 689
 690         runtime->hw.formats = subs->formats;
 691
 692         runtime->hw.rate_min = 0x7fffffff;
 693         runtime->hw.rate_max = 0;
 694         runtime->hw.channels_min = 256;
 695         runtime->hw.channels_max = 0;
 696         runtime->hw.rates = 0;
 697         ptmin = UINT_MAX;
 698         /* check min/max rates and channels */
 699         list_for_each(p, &subs->fmt_list) {
 700                 struct audioformat *fp;
 701                 fp = list_entry(p, struct audioformat, list);
 702                 runtime->hw.rates |= fp->rates;
 703                 if (runtime->hw.rate_min > fp->rate_min)
 704                         runtime->hw.rate_min = fp->rate_min;
 705                 if (runtime->hw.rate_max < fp->rate_max)
 706                         runtime->hw.rate_max = fp->rate_max;
 707                 if (runtime->hw.channels_min > fp->channels)
 708                         runtime->hw.channels_min = fp->channels;
 709                 if (runtime->hw.channels_max < fp->channels)
 710                         runtime->hw.channels_max = fp->channels;
 711                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 712                         /* FIXME: there might be more than one audio formats... */
 713                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 714                                 fp->frame_size;
 715                 }
 716                 pt = 125 * (1 << fp->datainterval);
 717                 ptmin = min(ptmin, pt);
 718         }
 719
 720         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 721         if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
 722                 /* full speed devices have fixed data packet interval */
 723                 ptmin = 1000;
 724         if (ptmin == 1000)
 725                 /* if period time doesn't go below 1 ms, no rules needed */
 726                 param_period_time_if_needed = -1;
 727         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 728                                      ptmin, UINT_MAX);
 729
 730         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 731                                        hw_rule_rate, subs,
 732                                        SNDRV_PCM_HW_PARAM_FORMAT,
 733                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 734                                        param_period_time_if_needed,
 735                                        -1)) < 0)
 736                 return err;
 737         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 738                                        hw_rule_channels, subs,
 739                                        SNDRV_PCM_HW_PARAM_FORMAT,
 740                                        SNDRV_PCM_HW_PARAM_RATE,
 741                                        param_period_time_if_needed,
 742                                        -1)) < 0)
 743                 return err;
 744         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 745                                        hw_rule_format, subs,
 746                                        SNDRV_PCM_HW_PARAM_RATE,
 747                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 748                                        param_period_time_if_needed,
 749                                        -1)) < 0)
 750                 return err;
 751         if (param_period_time_if_needed >= 0) {
 752                 err = snd_pcm_hw_rule_add(runtime, 0,
 753                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 754                                           hw_rule_period_time, subs,
 755                                           SNDRV_PCM_HW_PARAM_FORMAT,
 756                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 757                                           SNDRV_PCM_HW_PARAM_RATE,
 758                                           -1);
 759                 if (err < 0)
 760                         return err;
 761         }
 762         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 763                 return err;
 764         return 0;
 765 }
 766
 767 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 768 {
 769         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 770         struct snd_pcm_runtime *runtime = substream->runtime;
 771         struct snd_usb_substream *subs = &as->substream[direction];
 772
 773         subs->interface = -1;
 774         subs->format = 0;
 775         runtime->hw = snd_usb_hardware;
 776         runtime->private_data = subs;
 777         subs->pcm_substream = substream;
 778         return setup_hw_info(runtime, subs);
 779 }
 780
 781 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 782 {
 783         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 784         struct snd_usb_substream *subs = &as->substream[direction];
 785
 786         if (!as->chip->shutdown && subs->interface >= 0) {
 787                 usb_set_interface(subs->dev, subs->interface, 0);
 788                 subs->interface = -1;
 789         }
 790         subs->pcm_substream = NULL;
 791         return 0;
 792 }
 793
 794 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 795 {
 796         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 797 }
 798
 799 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 800 {
 801         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 802 }
 803
 804 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 805 {
 806         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 807 }
 808
 809 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 810 {
 811         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 812 }
 813
 814 static struct snd_pcm_ops snd_usb_playback_ops = {
 815         .open =         snd_usb_playback_open,
 816         .close =        snd_usb_playback_close,
 817         .ioctl =        snd_pcm_lib_ioctl,
 818         .hw_params =    snd_usb_hw_params,
 819         .hw_free =      snd_usb_hw_free,
 820         .prepare =      snd_usb_pcm_prepare,
 821         .trigger =      snd_usb_substream_playback_trigger,
 822         .pointer =      snd_usb_pcm_pointer,
 823         .page =         snd_pcm_lib_get_vmalloc_page,
 824         .mmap =         snd_pcm_lib_mmap_vmalloc,
 825 };
 826
 827 static struct snd_pcm_ops snd_usb_capture_ops = {
 828         .open =         snd_usb_capture_open,
 829         .close =        snd_usb_capture_close,
 830         .ioctl =        snd_pcm_lib_ioctl,
 831         .hw_params =    snd_usb_hw_params,
 832         .hw_free =      snd_usb_hw_free,
 833         .prepare =      snd_usb_pcm_prepare,
 834         .trigger =      snd_usb_substream_capture_trigger,
 835         .pointer =      snd_usb_pcm_pointer,
 836         .page =         snd_pcm_lib_get_vmalloc_page,
 837         .mmap =         snd_pcm_lib_mmap_vmalloc,
 838 };
 839
 840 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 841 {
 842         snd_pcm_set_ops(pcm, stream,
 843                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 844                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 845 }