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 #include "power.h"
  36
  37 /*
  38  * return the current pcm pointer.  just based on the hwptr_done value.
  39  */
  40 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  41 {
  42         struct snd_usb_substream *subs;
  43         unsigned int hwptr_done;
  44
  45         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  46         spin_lock(&subs->lock);
  47         hwptr_done = subs->hwptr_done;
  48         spin_unlock(&subs->lock);
  49         return hwptr_done / (substream->runtime->frame_bits >> 3);
  50 }
  51
  52 /*
  53  * find a matching audio format
  54  */
  55 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  56                                        unsigned int rate, unsigned int channels)
  57 {
  58         struct list_head *p;
  59         struct audioformat *found = NULL;
  60         int cur_attr = 0, attr;
  61
  62         list_for_each(p, &subs->fmt_list) {
  63                 struct audioformat *fp;
  64                 fp = list_entry(p, struct audioformat, list);
  65                 if (!(fp->formats & (1uLL << format)))
  66                         continue;
  67                 if (fp->channels != channels)
  68                         continue;
  69                 if (rate < fp->rate_min || rate > fp->rate_max)
  70                         continue;
  71                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  72                         unsigned int i;
  73                         for (i = 0; i < fp->nr_rates; i++)
  74                                 if (fp->rate_table[i] == rate)
  75                                         break;
  76                         if (i >= fp->nr_rates)
  77                                 continue;
  78                 }
  79                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  80                 if (! found) {
  81                         found = fp;
  82                         cur_attr = attr;
  83                         continue;
  84                 }
  85                 /* avoid async out and adaptive in if the other method
  86                  * supports the same format.
  87                  * this is a workaround for the case like
  88                  * M-audio audiophile USB.
  89                  */
  90                 if (attr != cur_attr) {
  91                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  92                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  93                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  94                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  95                                 continue;
  96                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  97                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  98                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  99                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 100                                 found = fp;
 101                                 cur_attr = attr;
 102                                 continue;
 103                         }
 104                 }
 105                 /* find the format with the largest max. packet size */
 106                 if (fp->maxpacksize > found->maxpacksize) {
 107                         found = fp;
 108                         cur_attr = attr;
 109                 }
 110         }
 111         return found;
 112 }
 113
 114 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 115                          struct usb_host_interface *alts,
 116                          struct audioformat *fmt)
 117 {
 118         struct usb_device *dev = chip->dev;
 119         unsigned int ep;
 120         unsigned char data[1];
 121         int err;
 122
 123         ep = get_endpoint(alts, 0)->bEndpointAddress;
 124
 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,
 129                                    data, sizeof(data), 1000)) < 0) {
 130                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 131                            dev->devnum, iface, ep);
 132                 return err;
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 139                          struct usb_host_interface *alts,
 140                          struct audioformat *fmt)
 141 {
 142         struct usb_device *dev = chip->dev;
 143         unsigned char data[1];
 144         unsigned int ep;
 145         int err;
 146
 147         ep = get_endpoint(alts, 0)->bEndpointAddress;
 148
 149         data[0] = 1;
 150         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 151                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 152                                    UAC2_EP_CS_PITCH << 8, 0,
 153                                    data, sizeof(data), 1000)) < 0) {
 154                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 155                            dev->devnum, iface, fmt->altsetting);
 156                 return err;
 157         }
 158
 159         return 0;
 160 }
 161
 162 /*
 163  * initialize the pitch control and sample rate
 164  */
 165 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 166                        struct usb_host_interface *alts,
 167                        struct audioformat *fmt)
 168 {
 169         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 170
 171         /* if endpoint doesn't have pitch control, bail out */
 172         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 173                 return 0;
 174
 175         switch (altsd->bInterfaceProtocol) {
 176         case UAC_VERSION_1:
 177         default:
 178                 return init_pitch_v1(chip, iface, alts, fmt);
 179
 180         case UAC_VERSION_2:
 181                 return init_pitch_v2(chip, iface, alts, fmt);
 182         }
 183 }
 184
 185 /*
 186  * find a matching format and set up the interface
 187  */
 188 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 189 {
 190         struct usb_device *dev = subs->dev;
 191         struct usb_host_interface *alts;
 192         struct usb_interface_descriptor *altsd;
 193         struct usb_interface *iface;
 194         unsigned int ep, attr;
 195         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 196         int err;
 197
 198         iface = usb_ifnum_to_if(dev, fmt->iface);
 199         if (WARN_ON(!iface))
 200                 return -EINVAL;
 201         alts = &iface->altsetting[fmt->altset_idx];
 202         altsd = get_iface_desc(alts);
 203         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 204                 return -EINVAL;
 205
 206         if (fmt == subs->cur_audiofmt)
 207                 return 0;
 208
 209         /* close the old interface */
 210         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 211                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 212                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 213                                 dev->devnum, fmt->iface, fmt->altsetting);
 214                         return -EIO;
 215                 }
 216                 subs->interface = -1;
 217                 subs->altset_idx = 0;
 218         }
 219
 220         /* set interface */
 221         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 222                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 223                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 224                                    dev->devnum, fmt->iface, fmt->altsetting);
 225                         return -EIO;
 226                 }
 227                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 228                 subs->interface = fmt->iface;
 229                 subs->altset_idx = fmt->altset_idx;
 230         }
 231
 232         /* create a data pipe */
 233         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 234         if (is_playback)
 235                 subs->datapipe = usb_sndisocpipe(dev, ep);
 236         else
 237                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 238         subs->datainterval = fmt->datainterval;
 239         subs->syncpipe = subs->syncinterval = 0;
 240         subs->maxpacksize = fmt->maxpacksize;
 241         subs->syncmaxsize = 0;
 242         subs->fill_max = 0;
 243
 244         /* we need a sync pipe in async OUT or adaptive IN mode */
 245         /* check the number of EP, since some devices have broken
 246          * descriptors which fool us.  if it has only one EP,
 247          * assume it as adaptive-out or sync-in.
 248          */
 249         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 250         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 251              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 252             altsd->bNumEndpoints >= 2) {
 253                 /* check sync-pipe endpoint */
 254                 /* ... and check descriptor size before accessing bSynchAddress
 255                    because there is a version of the SB Audigy 2 NX firmware lacking
 256                    the audio fields in the endpoint descriptors */
 257                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 258                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 259                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 260                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 261                                    dev->devnum, fmt->iface, fmt->altsetting);
 262                         return -EINVAL;
 263                 }
 264                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 265                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 266                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 267                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 268                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 269                                    dev->devnum, fmt->iface, fmt->altsetting);
 270                         return -EINVAL;
 271                 }
 272                 ep &= USB_ENDPOINT_NUMBER_MASK;
 273                 if (is_playback)
 274                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 275                 else
 276                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 277                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 278                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 279                     get_endpoint(alts, 1)->bRefresh <= 9)
 280                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 281                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 282                         subs->syncinterval = 1;
 283                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 284                          get_endpoint(alts, 1)->bInterval <= 16)
 285                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 286                 else
 287                         subs->syncinterval = 3;
 288                 subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
 289         }
 290
 291         /* always fill max packet size */
 292         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 293                 subs->fill_max = 1;
 294
 295         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 296                 return err;
 297
 298         subs->cur_audiofmt = fmt;
 299
 300         snd_usb_set_format_quirk(subs, fmt);
 301
 302 #if 0
 303         printk(KERN_DEBUG
 304                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 305                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 306         printk(KERN_DEBUG
 307                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 308                subs->datapipe, subs->syncpipe);
 309 #endif
 310
 311         return 0;
 312 }
 313
 314 /*
 315  * hw_params callback
 316  *
 317  * allocate a buffer and set the given audio format.
 318  *
 319  * so far we use a physically linear buffer although packetize transfer
 320  * doesn't need a continuous area.
 321  * if sg buffer is supported on the later version of alsa, we'll follow
 322  * that.
 323  */
 324 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 325                              struct snd_pcm_hw_params *hw_params)
 326 {
 327         struct snd_usb_substream *subs = substream->runtime->private_data;
 328         struct audioformat *fmt;
 329         unsigned int channels, rate, format;
 330         int ret, changed;
 331
 332         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 333                                                params_buffer_bytes(hw_params));
 334         if (ret < 0)
 335                 return ret;
 336
 337         format = params_format(hw_params);
 338         rate = params_rate(hw_params);
 339         channels = params_channels(hw_params);
 340         fmt = find_format(subs, format, rate, channels);
 341         if (!fmt) {
 342                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 343                            format, rate, channels);
 344                 return -EINVAL;
 345         }
 346
 347         changed = subs->cur_audiofmt != fmt ||
 348                 subs->period_bytes != params_period_bytes(hw_params) ||
 349                 subs->cur_rate != rate;
 350         if ((ret = set_format(subs, fmt)) < 0)
 351                 return ret;
 352
 353         if (subs->cur_rate != rate) {
 354                 struct usb_host_interface *alts;
 355                 struct usb_interface *iface;
 356                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 357                 alts = &iface->altsetting[fmt->altset_idx];
 358                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 359                 if (ret < 0)
 360                         return ret;
 361                 subs->cur_rate = rate;
 362         }
 363
 364         if (changed) {
 365                 mutex_lock(&subs->stream->chip->shutdown_mutex);
 366                 /* format changed */
 367                 snd_usb_release_substream_urbs(subs, 0);
 368                 /* influenced: period_bytes, channels, rate, format, */
 369                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 370                                                   params_rate(hw_params),
 371                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 372                                                         params_channels(hw_params));
 373                 mutex_unlock(&subs->stream->chip->shutdown_mutex);
 374         }
 375
 376         return ret;
 377 }
 378
 379 /*
 380  * hw_free callback
 381  *
 382  * reset the audio format and release the buffer
 383  */
 384 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 385 {
 386         struct snd_usb_substream *subs = substream->runtime->private_data;
 387
 388         subs->cur_audiofmt = NULL;
 389         subs->cur_rate = 0;
 390         subs->period_bytes = 0;
 391         mutex_lock(&subs->stream->chip->shutdown_mutex);
 392         snd_usb_release_substream_urbs(subs, 0);
 393         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 394         return snd_pcm_lib_free_vmalloc_buffer(substream);
 395 }
 396
 397 /*
 398  * prepare callback
 399  *
 400  * only a few subtle things...
 401  */
 402 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 403 {
 404         struct snd_pcm_runtime *runtime = substream->runtime;
 405         struct snd_usb_substream *subs = runtime->private_data;
 406
 407         if (! subs->cur_audiofmt) {
 408                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 409                 return -ENXIO;
 410         }
 411
 412         /* some unit conversions in runtime */
 413         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 414         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 415
 416         /* reset the pointer */
 417         subs->hwptr_done = 0;
 418         subs->transfer_done = 0;
 419         subs->phase = 0;
 420         runtime->delay = 0;
 421
 422         return snd_usb_substream_prepare(subs, runtime);
 423 }
 424
 425 static struct snd_pcm_hardware snd_usb_hardware =
 426 {
 427         .info =                 SNDRV_PCM_INFO_MMAP |
 428                                 SNDRV_PCM_INFO_MMAP_VALID |
 429                                 SNDRV_PCM_INFO_BATCH |
 430                                 SNDRV_PCM_INFO_INTERLEAVED |
 431                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 432                                 SNDRV_PCM_INFO_PAUSE,
 433         .buffer_bytes_max =     1024 * 1024,
 434         .period_bytes_min =     64,
 435         .period_bytes_max =     512 * 1024,
 436         .periods_min =          2,
 437         .periods_max =          1024,
 438 };
 439
 440 static int hw_check_valid_format(struct snd_usb_substream *subs,
 441                                  struct snd_pcm_hw_params *params,
 442                                  struct audioformat *fp)
 443 {
 444         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 445         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 446         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 447         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 448         struct snd_mask check_fmts;
 449         unsigned int ptime;
 450
 451         /* check the format */
 452         snd_mask_none(&check_fmts);
 453         check_fmts.bits[0] = (u32)fp->formats;
 454         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 455         snd_mask_intersect(&check_fmts, fmts);
 456         if (snd_mask_empty(&check_fmts)) {
 457                 hwc_debug("   > check: no supported format %d\n", fp->format);
 458                 return 0;
 459         }
 460         /* check the channels */
 461         if (fp->channels < ct->min || fp->channels > ct->max) {
 462                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 463                 return 0;
 464         }
 465         /* check the rate is within the range */
 466         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 467                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 468                 return 0;
 469         }
 470         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 471                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 472                 return 0;
 473         }
 474         /* check whether the period time is >= the data packet interval */
 475         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 476                 ptime = 125 * (1 << fp->datainterval);
 477                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 478                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 479                         return 0;
 480                 }
 481         }
 482         return 1;
 483 }
 484
 485 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 486                         struct snd_pcm_hw_rule *rule)
 487 {
 488         struct snd_usb_substream *subs = rule->private;
 489         struct list_head *p;
 490         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 491         unsigned int rmin, rmax;
 492         int changed;
 493
 494         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 495         changed = 0;
 496         rmin = rmax = 0;
 497         list_for_each(p, &subs->fmt_list) {
 498                 struct audioformat *fp;
 499                 fp = list_entry(p, struct audioformat, list);
 500                 if (!hw_check_valid_format(subs, params, fp))
 501                         continue;
 502                 if (changed++) {
 503                         if (rmin > fp->rate_min)
 504                                 rmin = fp->rate_min;
 505                         if (rmax < fp->rate_max)
 506                                 rmax = fp->rate_max;
 507                 } else {
 508                         rmin = fp->rate_min;
 509                         rmax = fp->rate_max;
 510                 }
 511         }
 512
 513         if (!changed) {
 514                 hwc_debug("  --> get empty\n");
 515                 it->empty = 1;
 516                 return -EINVAL;
 517         }
 518
 519         changed = 0;
 520         if (it->min < rmin) {
 521                 it->min = rmin;
 522                 it->openmin = 0;
 523                 changed = 1;
 524         }
 525         if (it->max > rmax) {
 526                 it->max = rmax;
 527                 it->openmax = 0;
 528                 changed = 1;
 529         }
 530         if (snd_interval_checkempty(it)) {
 531                 it->empty = 1;
 532                 return -EINVAL;
 533         }
 534         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 535         return changed;
 536 }
 537
 538
 539 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 540                             struct snd_pcm_hw_rule *rule)
 541 {
 542         struct snd_usb_substream *subs = rule->private;
 543         struct list_head *p;
 544         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 545         unsigned int rmin, rmax;
 546         int changed;
 547
 548         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 549         changed = 0;
 550         rmin = rmax = 0;
 551         list_for_each(p, &subs->fmt_list) {
 552                 struct audioformat *fp;
 553                 fp = list_entry(p, struct audioformat, list);
 554                 if (!hw_check_valid_format(subs, params, fp))
 555                         continue;
 556                 if (changed++) {
 557                         if (rmin > fp->channels)
 558                                 rmin = fp->channels;
 559                         if (rmax < fp->channels)
 560                                 rmax = fp->channels;
 561                 } else {
 562                         rmin = fp->channels;
 563                         rmax = fp->channels;
 564                 }
 565         }
 566
 567         if (!changed) {
 568                 hwc_debug("  --> get empty\n");
 569                 it->empty = 1;
 570                 return -EINVAL;
 571         }
 572
 573         changed = 0;
 574         if (it->min < rmin) {
 575                 it->min = rmin;
 576                 it->openmin = 0;
 577                 changed = 1;
 578         }
 579         if (it->max > rmax) {
 580                 it->max = rmax;
 581                 it->openmax = 0;
 582                 changed = 1;
 583         }
 584         if (snd_interval_checkempty(it)) {
 585                 it->empty = 1;
 586                 return -EINVAL;
 587         }
 588         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 589         return changed;
 590 }
 591
 592 static int hw_rule_format(struct snd_pcm_hw_params *params,
 593                           struct snd_pcm_hw_rule *rule)
 594 {
 595         struct snd_usb_substream *subs = rule->private;
 596         struct list_head *p;
 597         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 598         u64 fbits;
 599         u32 oldbits[2];
 600         int changed;
 601
 602         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 603         fbits = 0;
 604         list_for_each(p, &subs->fmt_list) {
 605                 struct audioformat *fp;
 606                 fp = list_entry(p, struct audioformat, list);
 607                 if (!hw_check_valid_format(subs, params, fp))
 608                         continue;
 609                 fbits |= fp->formats;
 610         }
 611
 612         oldbits[0] = fmt->bits[0];
 613         oldbits[1] = fmt->bits[1];
 614         fmt->bits[0] &= (u32)fbits;
 615         fmt->bits[1] &= (u32)(fbits >> 32);
 616         if (!fmt->bits[0] && !fmt->bits[1]) {
 617                 hwc_debug("  --> get empty\n");
 618                 return -EINVAL;
 619         }
 620         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 621         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 622         return changed;
 623 }
 624
 625 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 626                                struct snd_pcm_hw_rule *rule)
 627 {
 628         struct snd_usb_substream *subs = rule->private;
 629         struct audioformat *fp;
 630         struct snd_interval *it;
 631         unsigned char min_datainterval;
 632         unsigned int pmin;
 633         int changed;
 634
 635         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 636         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 637         min_datainterval = 0xff;
 638         list_for_each_entry(fp, &subs->fmt_list, list) {
 639                 if (!hw_check_valid_format(subs, params, fp))
 640                         continue;
 641                 min_datainterval = min(min_datainterval, fp->datainterval);
 642         }
 643         if (min_datainterval == 0xff) {
 644                 hwc_debug("  --> get empty\n");
 645                 it->empty = 1;
 646                 return -EINVAL;
 647         }
 648         pmin = 125 * (1 << min_datainterval);
 649         changed = 0;
 650         if (it->min < pmin) {
 651                 it->min = pmin;
 652                 it->openmin = 0;
 653                 changed = 1;
 654         }
 655         if (snd_interval_checkempty(it)) {
 656                 it->empty = 1;
 657                 return -EINVAL;
 658         }
 659         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 660         return changed;
 661 }
 662
 663 /*
 664  *  If the device supports unusual bit rates, does the request meet these?
 665  */
 666 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 667                                   struct snd_usb_substream *subs)
 668 {
 669         struct audioformat *fp;
 670         int count = 0, needs_knot = 0;
 671         int err;
 672
 673         list_for_each_entry(fp, &subs->fmt_list, list) {
 674                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 675                         return 0;
 676                 count += fp->nr_rates;
 677                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 678                         needs_knot = 1;
 679         }
 680         if (!needs_knot)
 681                 return 0;
 682
 683         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 684         if (!subs->rate_list.list)
 685                 return -ENOMEM;
 686         subs->rate_list.count = count;
 687         subs->rate_list.mask = 0;
 688         count = 0;
 689         list_for_each_entry(fp, &subs->fmt_list, list) {
 690                 int i;
 691                 for (i = 0; i < fp->nr_rates; i++)
 692                         subs->rate_list.list[count++] = fp->rate_table[i];
 693         }
 694         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 695                                          &subs->rate_list);
 696         if (err < 0)
 697                 return err;
 698
 699         return 0;
 700 }
 701
 702
 703 /*
 704  * set up the runtime hardware information.
 705  */
 706
 707 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 708 {
 709         struct list_head *p;
 710         unsigned int pt, ptmin;
 711         int param_period_time_if_needed;
 712         int err;
 713
 714         runtime->hw.formats = subs->formats;
 715
 716         runtime->hw.rate_min = 0x7fffffff;
 717         runtime->hw.rate_max = 0;
 718         runtime->hw.channels_min = 256;
 719         runtime->hw.channels_max = 0;
 720         runtime->hw.rates = 0;
 721         ptmin = UINT_MAX;
 722         /* check min/max rates and channels */
 723         list_for_each(p, &subs->fmt_list) {
 724                 struct audioformat *fp;
 725                 fp = list_entry(p, struct audioformat, list);
 726                 runtime->hw.rates |= fp->rates;
 727                 if (runtime->hw.rate_min > fp->rate_min)
 728                         runtime->hw.rate_min = fp->rate_min;
 729                 if (runtime->hw.rate_max < fp->rate_max)
 730                         runtime->hw.rate_max = fp->rate_max;
 731                 if (runtime->hw.channels_min > fp->channels)
 732                         runtime->hw.channels_min = fp->channels;
 733                 if (runtime->hw.channels_max < fp->channels)
 734                         runtime->hw.channels_max = fp->channels;
 735                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 736                         /* FIXME: there might be more than one audio formats... */
 737                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 738                                 fp->frame_size;
 739                 }
 740                 pt = 125 * (1 << fp->datainterval);
 741                 ptmin = min(ptmin, pt);
 742         }
 743         err = snd_usb_autoresume(subs->stream->chip);
 744         if (err < 0)
 745                 return err;
 746
 747         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 748         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 749                 /* full speed devices have fixed data packet interval */
 750                 ptmin = 1000;
 751         if (ptmin == 1000)
 752                 /* if period time doesn't go below 1 ms, no rules needed */
 753                 param_period_time_if_needed = -1;
 754         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 755                                      ptmin, UINT_MAX);
 756
 757         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 758                                        hw_rule_rate, subs,
 759                                        SNDRV_PCM_HW_PARAM_FORMAT,
 760                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 761                                        param_period_time_if_needed,
 762                                        -1)) < 0)
 763                 goto rep_err;
 764         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 765                                        hw_rule_channels, subs,
 766                                        SNDRV_PCM_HW_PARAM_FORMAT,
 767                                        SNDRV_PCM_HW_PARAM_RATE,
 768                                        param_period_time_if_needed,
 769                                        -1)) < 0)
 770                 goto rep_err;
 771         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 772                                        hw_rule_format, subs,
 773                                        SNDRV_PCM_HW_PARAM_RATE,
 774                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 775                                        param_period_time_if_needed,
 776                                        -1)) < 0)
 777                 goto rep_err;
 778         if (param_period_time_if_needed >= 0) {
 779                 err = snd_pcm_hw_rule_add(runtime, 0,
 780                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 781                                           hw_rule_period_time, subs,
 782                                           SNDRV_PCM_HW_PARAM_FORMAT,
 783                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 784                                           SNDRV_PCM_HW_PARAM_RATE,
 785                                           -1);
 786                 if (err < 0)
 787                         goto rep_err;
 788         }
 789         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 790                 goto rep_err;
 791         return 0;
 792
 793 rep_err:
 794         snd_usb_autosuspend(subs->stream->chip);
 795         return err;
 796 }
 797
 798 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 799 {
 800         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 801         struct snd_pcm_runtime *runtime = substream->runtime;
 802         struct snd_usb_substream *subs = &as->substream[direction];
 803
 804         subs->interface = -1;
 805         subs->altset_idx = 0;
 806         runtime->hw = snd_usb_hardware;
 807         runtime->private_data = subs;
 808         subs->pcm_substream = substream;
 809         /* runtime PM is also done there */
 810         return setup_hw_info(runtime, subs);
 811 }
 812
 813 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 814 {
 815         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 816         struct snd_usb_substream *subs = &as->substream[direction];
 817
 818         if (!as->chip->shutdown && subs->interface >= 0) {
 819                 usb_set_interface(subs->dev, subs->interface, 0);
 820                 subs->interface = -1;
 821         }
 822         subs->pcm_substream = NULL;
 823         snd_usb_autosuspend(subs->stream->chip);
 824         return 0;
 825 }
 826
 827 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 828 {
 829         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 830 }
 831
 832 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 833 {
 834         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 835 }
 836
 837 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 838 {
 839         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 840 }
 841
 842 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 843 {
 844         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 845 }
 846
 847 static struct snd_pcm_ops snd_usb_playback_ops = {
 848         .open =         snd_usb_playback_open,
 849         .close =        snd_usb_playback_close,
 850         .ioctl =        snd_pcm_lib_ioctl,
 851         .hw_params =    snd_usb_hw_params,
 852         .hw_free =      snd_usb_hw_free,
 853         .prepare =      snd_usb_pcm_prepare,
 854         .trigger =      snd_usb_substream_playback_trigger,
 855         .pointer =      snd_usb_pcm_pointer,
 856         .page =         snd_pcm_lib_get_vmalloc_page,
 857         .mmap =         snd_pcm_lib_mmap_vmalloc,
 858 };
 859
 860 static struct snd_pcm_ops snd_usb_capture_ops = {
 861         .open =         snd_usb_capture_open,
 862         .close =        snd_usb_capture_close,
 863         .ioctl =        snd_pcm_lib_ioctl,
 864         .hw_params =    snd_usb_hw_params,
 865         .hw_free =      snd_usb_hw_free,
 866         .prepare =      snd_usb_pcm_prepare,
 867         .trigger =      snd_usb_substream_capture_trigger,
 868         .pointer =      snd_usb_pcm_pointer,
 869         .page =         snd_pcm_lib_get_vmalloc_page,
 870         .mmap =         snd_pcm_lib_mmap_vmalloc,
 871 };
 872
 873 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 874 {
 875         snd_pcm_set_ops(pcm, stream,
 876                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 877                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 878 }