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