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 "endpoint.h"
  32 #include "helper.h"
  33 #include "pcm.h"
  34 #include "clock.h"
  35 #include "power.h"
  36
  37 /* return the estimated delay based on USB frame counters */
  38 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  39                                     unsigned int rate)
  40 {
  41         int current_frame_number;
  42         int frame_diff;
  43         int est_delay;
  44
  45         current_frame_number = usb_get_current_frame_number(subs->dev);
  46         /*
  47          * HCD implementations use different widths, use lower 8 bits.
  48          * The delay will be managed up to 256ms, which is more than
  49          * enough
  50          */
  51         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  52
  53         /* Approximation based on number of samples per USB frame (ms),
  54            some truncation for 44.1 but the estimate is good enough */
  55         est_delay =  subs->last_delay - (frame_diff * rate / 1000);
  56         if (est_delay < 0)
  57                 est_delay = 0;
  58         return est_delay;
  59 }
  60
  61 /*
  62  * return the current pcm pointer.  just based on the hwptr_done value.
  63  */
  64 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  65 {
  66         struct snd_usb_substream *subs;
  67         unsigned int hwptr_done;
  68
  69         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  70         if (subs->stream->chip->shutdown)
  71                 return SNDRV_PCM_POS_XRUN;
  72         spin_lock(&subs->lock);
  73         hwptr_done = subs->hwptr_done;
  74         substream->runtime->delay = snd_usb_pcm_delay(subs,
  75                                                 substream->runtime->rate);
  76         spin_unlock(&subs->lock);
  77         return hwptr_done / (substream->runtime->frame_bits >> 3);
  78 }
  79
  80 /*
  81  * find a matching audio format
  82  */
  83 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  84                                        unsigned int rate, unsigned int channels)
  85 {
  86         struct list_head *p;
  87         struct audioformat *found = NULL;
  88         int cur_attr = 0, attr;
  89
  90         list_for_each(p, &subs->fmt_list) {
  91                 struct audioformat *fp;
  92                 fp = list_entry(p, struct audioformat, list);
  93                 if (!(fp->formats & (1uLL << format)))
  94                         continue;
  95                 if (fp->channels != channels)
  96                         continue;
  97                 if (rate < fp->rate_min || rate > fp->rate_max)
  98                         continue;
  99                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 100                         unsigned int i;
 101                         for (i = 0; i < fp->nr_rates; i++)
 102                                 if (fp->rate_table[i] == rate)
 103                                         break;
 104                         if (i >= fp->nr_rates)
 105                                 continue;
 106                 }
 107                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 108                 if (! found) {
 109                         found = fp;
 110                         cur_attr = attr;
 111                         continue;
 112                 }
 113                 /* avoid async out and adaptive in if the other method
 114                  * supports the same format.
 115                  * this is a workaround for the case like
 116                  * M-audio audiophile USB.
 117                  */
 118                 if (attr != cur_attr) {
 119                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 120                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 121                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 122                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 123                                 continue;
 124                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 125                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 126                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 127                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 128                                 found = fp;
 129                                 cur_attr = attr;
 130                                 continue;
 131                         }
 132                 }
 133                 /* find the format with the largest max. packet size */
 134                 if (fp->maxpacksize > found->maxpacksize) {
 135                         found = fp;
 136                         cur_attr = attr;
 137                 }
 138         }
 139         return found;
 140 }
 141
 142 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 143                          struct usb_host_interface *alts,
 144                          struct audioformat *fmt)
 145 {
 146         struct usb_device *dev = chip->dev;
 147         unsigned int ep;
 148         unsigned char data[1];
 149         int err;
 150
 151         if (get_iface_desc(alts)->bNumEndpoints < 1)
 152                 return -EINVAL;
 153         ep = get_endpoint(alts, 0)->bEndpointAddress;
 154
 155         data[0] = 1;
 156         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 157                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 158                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 159                                    data, sizeof(data))) < 0) {
 160                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 161                            dev->devnum, iface, ep);
 162                 return err;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 169                          struct usb_host_interface *alts,
 170                          struct audioformat *fmt)
 171 {
 172         struct usb_device *dev = chip->dev;
 173         unsigned char data[1];
 174         unsigned int ep;
 175         int err;
 176
 177         ep = get_endpoint(alts, 0)->bEndpointAddress;
 178
 179         data[0] = 1;
 180         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 181                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 182                                    UAC2_EP_CS_PITCH << 8, 0,
 183                                    data, sizeof(data))) < 0) {
 184                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 185                            dev->devnum, iface, fmt->altsetting);
 186                 return err;
 187         }
 188
 189         return 0;
 190 }
 191
 192 /*
 193  * initialize the pitch control and sample rate
 194  */
 195 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 196                        struct usb_host_interface *alts,
 197                        struct audioformat *fmt)
 198 {
 199         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 200
 201         /* if endpoint doesn't have pitch control, bail out */
 202         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 203                 return 0;
 204
 205         switch (altsd->bInterfaceProtocol) {
 206         case UAC_VERSION_1:
 207         default:
 208                 return init_pitch_v1(chip, iface, alts, fmt);
 209
 210         case UAC_VERSION_2:
 211                 return init_pitch_v2(chip, iface, alts, fmt);
 212         }
 213 }
 214
 215 /*
 216  * find a matching format and set up the interface
 217  */
 218 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 219 {
 220         struct usb_device *dev = subs->dev;
 221         struct usb_host_interface *alts;
 222         struct usb_interface_descriptor *altsd;
 223         struct usb_interface *iface;
 224         unsigned int ep, attr;
 225         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 226         int err;
 227
 228         iface = usb_ifnum_to_if(dev, fmt->iface);
 229         if (WARN_ON(!iface))
 230                 return -EINVAL;
 231         alts = &iface->altsetting[fmt->altset_idx];
 232         altsd = get_iface_desc(alts);
 233         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 234                 return -EINVAL;
 235
 236         if (fmt == subs->cur_audiofmt)
 237                 return 0;
 238
 239         /* close the old interface */
 240         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 241                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 242                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 243                                 dev->devnum, fmt->iface, fmt->altsetting);
 244                         return -EIO;
 245                 }
 246                 subs->interface = -1;
 247                 subs->altset_idx = 0;
 248         }
 249
 250         /* set interface */
 251         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 252                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 253                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 254                                    dev->devnum, fmt->iface, fmt->altsetting);
 255                         return -EIO;
 256                 }
 257                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 258                 subs->interface = fmt->iface;
 259                 subs->altset_idx = fmt->altset_idx;
 260         }
 261
 262         /* create a data pipe */
 263         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 264         if (is_playback)
 265                 subs->datapipe = usb_sndisocpipe(dev, ep);
 266         else
 267                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 268         subs->datainterval = fmt->datainterval;
 269         subs->syncpipe = subs->syncinterval = 0;
 270         subs->maxpacksize = fmt->maxpacksize;
 271         subs->syncmaxsize = 0;
 272         subs->fill_max = 0;
 273
 274         /* we need a sync pipe in async OUT or adaptive IN mode */
 275         /* check the number of EP, since some devices have broken
 276          * descriptors which fool us.  if it has only one EP,
 277          * assume it as adaptive-out or sync-in.
 278          */
 279         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 280         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 281              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 282             altsd->bNumEndpoints >= 2) {
 283                 /* check sync-pipe endpoint */
 284                 /* ... and check descriptor size before accessing bSynchAddress
 285                    because there is a version of the SB Audigy 2 NX firmware lacking
 286                    the audio fields in the endpoint descriptors */
 287                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 288                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 289                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 290                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 291                                    dev->devnum, fmt->iface, fmt->altsetting);
 292                         return -EINVAL;
 293                 }
 294                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 295                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 296                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 297                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 298                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 299                                    dev->devnum, fmt->iface, fmt->altsetting);
 300                         return -EINVAL;
 301                 }
 302                 ep &= USB_ENDPOINT_NUMBER_MASK;
 303                 if (is_playback)
 304                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 305                 else
 306                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 307                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 308                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 309                     get_endpoint(alts, 1)->bRefresh <= 9)
 310                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 311                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 312                         subs->syncinterval = 1;
 313                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 314                          get_endpoint(alts, 1)->bInterval <= 16)
 315                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 316                 else
 317                         subs->syncinterval = 3;
 318                 subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
 319         }
 320
 321         /* always fill max packet size */
 322         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 323                 subs->fill_max = 1;
 324
 325         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 326                 return err;
 327
 328         subs->cur_audiofmt = fmt;
 329
 330         snd_usb_set_format_quirk(subs, fmt);
 331
 332 #if 0
 333         printk(KERN_DEBUG
 334                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 335                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 336         printk(KERN_DEBUG
 337                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 338                subs->datapipe, subs->syncpipe);
 339 #endif
 340
 341         return 0;
 342 }
 343
 344 /*
 345  * hw_params callback
 346  *
 347  * allocate a buffer and set the given audio format.
 348  *
 349  * so far we use a physically linear buffer although packetize transfer
 350  * doesn't need a continuous area.
 351  * if sg buffer is supported on the later version of alsa, we'll follow
 352  * that.
 353  */
 354 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 355                              struct snd_pcm_hw_params *hw_params)
 356 {
 357         struct snd_usb_substream *subs = substream->runtime->private_data;
 358         struct audioformat *fmt;
 359         unsigned int channels, rate, format;
 360         int ret, changed;
 361
 362         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 363                                                params_buffer_bytes(hw_params));
 364         if (ret < 0)
 365                 return ret;
 366
 367         format = params_format(hw_params);
 368         rate = params_rate(hw_params);
 369         channels = params_channels(hw_params);
 370         fmt = find_format(subs, format, rate, channels);
 371         if (!fmt) {
 372                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 373                            format, rate, channels);
 374                 return -EINVAL;
 375         }
 376
 377         changed = subs->cur_audiofmt != fmt ||
 378                 subs->period_bytes != params_period_bytes(hw_params) ||
 379                 subs->cur_rate != rate;
 380
 381         down_read(&subs->stream->chip->shutdown_rwsem);
 382         if (subs->stream->chip->shutdown) {
 383                 ret = -ENODEV;
 384                 goto unlock;
 385         }
 386         if ((ret = set_format(subs, fmt)) < 0)
 387                 goto unlock;
 388
 389         if (subs->cur_rate != rate) {
 390                 struct usb_host_interface *alts;
 391                 struct usb_interface *iface;
 392                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 393                 alts = &iface->altsetting[fmt->altset_idx];
 394                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 395                 if (ret < 0)
 396                         goto unlock;
 397                 subs->cur_rate = rate;
 398         }
 399
 400         if (changed) {
 401                 /* format changed */
 402                 snd_usb_release_substream_urbs(subs, 0);
 403                 /* influenced: period_bytes, channels, rate, format, */
 404                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 405                                                   params_rate(hw_params),
 406                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 407                                                         params_channels(hw_params));
 408         }
 409
 410 unlock:
 411         up_read(&subs->stream->chip->shutdown_rwsem);
 412         return ret;
 413 }
 414
 415 /*
 416  * hw_free callback
 417  *
 418  * reset the audio format and release the buffer
 419  */
 420 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 421 {
 422         struct snd_usb_substream *subs = substream->runtime->private_data;
 423
 424         subs->cur_audiofmt = NULL;
 425         subs->cur_rate = 0;
 426         subs->period_bytes = 0;
 427         down_read(&subs->stream->chip->shutdown_rwsem);
 428         snd_usb_release_substream_urbs(subs, 0);
 429         up_read(&subs->stream->chip->shutdown_rwsem);
 430         return snd_pcm_lib_free_vmalloc_buffer(substream);
 431 }
 432
 433 /*
 434  * prepare callback
 435  *
 436  * only a few subtle things...
 437  */
 438 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 439 {
 440         struct snd_pcm_runtime *runtime = substream->runtime;
 441         struct snd_usb_substream *subs = runtime->private_data;
 442         int ret = 0;
 443
 444         if (! subs->cur_audiofmt) {
 445                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 446                 return -ENXIO;
 447         }
 448
 449         down_read(&subs->stream->chip->shutdown_rwsem);
 450         if (subs->stream->chip->shutdown) {
 451                 ret = -ENODEV;
 452                 goto unlock;
 453         }
 454         /* some unit conversions in runtime */
 455         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 456         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 457
 458         /* reset the pointer */
 459         subs->hwptr_done = 0;
 460         subs->transfer_done = 0;
 461         subs->phase = 0;
 462         subs->last_delay = 0;
 463         subs->last_frame_number = 0;
 464         runtime->delay = 0;
 465
 466         ret = snd_usb_substream_prepare(subs, runtime);
 467  unlock:
 468         up_read(&subs->stream->chip->shutdown_rwsem);
 469         return ret;
 470 }
 471
 472 static struct snd_pcm_hardware snd_usb_hardware =
 473 {
 474         .info =                 SNDRV_PCM_INFO_MMAP |
 475                                 SNDRV_PCM_INFO_MMAP_VALID |
 476                                 SNDRV_PCM_INFO_BATCH |
 477                                 SNDRV_PCM_INFO_INTERLEAVED |
 478                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 479                                 SNDRV_PCM_INFO_PAUSE,
 480         .buffer_bytes_max =     1024 * 1024,
 481         .period_bytes_min =     64,
 482         .period_bytes_max =     512 * 1024,
 483         .periods_min =          2,
 484         .periods_max =          1024,
 485 };
 486
 487 static int hw_check_valid_format(struct snd_usb_substream *subs,
 488                                  struct snd_pcm_hw_params *params,
 489                                  struct audioformat *fp)
 490 {
 491         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 492         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 493         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 494         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 495         struct snd_mask check_fmts;
 496         unsigned int ptime;
 497
 498         /* check the format */
 499         snd_mask_none(&check_fmts);
 500         check_fmts.bits[0] = (u32)fp->formats;
 501         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 502         snd_mask_intersect(&check_fmts, fmts);
 503         if (snd_mask_empty(&check_fmts)) {
 504                 hwc_debug("   > check: no supported format %d\n", fp->format);
 505                 return 0;
 506         }
 507         /* check the channels */
 508         if (fp->channels < ct->min || fp->channels > ct->max) {
 509                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 510                 return 0;
 511         }
 512         /* check the rate is within the range */
 513         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 514                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 515                 return 0;
 516         }
 517         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 518                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 519                 return 0;
 520         }
 521         /* check whether the period time is >= the data packet interval */
 522         if (subs->speed != USB_SPEED_FULL) {
 523                 ptime = 125 * (1 << fp->datainterval);
 524                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 525                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 526                         return 0;
 527                 }
 528         }
 529         return 1;
 530 }
 531
 532 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 533                         struct snd_pcm_hw_rule *rule)
 534 {
 535         struct snd_usb_substream *subs = rule->private;
 536         struct list_head *p;
 537         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 538         unsigned int rmin, rmax;
 539         int changed;
 540
 541         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 542         changed = 0;
 543         rmin = rmax = 0;
 544         list_for_each(p, &subs->fmt_list) {
 545                 struct audioformat *fp;
 546                 fp = list_entry(p, struct audioformat, list);
 547                 if (!hw_check_valid_format(subs, params, fp))
 548                         continue;
 549                 if (changed++) {
 550                         if (rmin > fp->rate_min)
 551                                 rmin = fp->rate_min;
 552                         if (rmax < fp->rate_max)
 553                                 rmax = fp->rate_max;
 554                 } else {
 555                         rmin = fp->rate_min;
 556                         rmax = fp->rate_max;
 557                 }
 558         }
 559
 560         if (!changed) {
 561                 hwc_debug("  --> get empty\n");
 562                 it->empty = 1;
 563                 return -EINVAL;
 564         }
 565
 566         changed = 0;
 567         if (it->min < rmin) {
 568                 it->min = rmin;
 569                 it->openmin = 0;
 570                 changed = 1;
 571         }
 572         if (it->max > rmax) {
 573                 it->max = rmax;
 574                 it->openmax = 0;
 575                 changed = 1;
 576         }
 577         if (snd_interval_checkempty(it)) {
 578                 it->empty = 1;
 579                 return -EINVAL;
 580         }
 581         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 582         return changed;
 583 }
 584
 585
 586 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 587                             struct snd_pcm_hw_rule *rule)
 588 {
 589         struct snd_usb_substream *subs = rule->private;
 590         struct list_head *p;
 591         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 592         unsigned int rmin, rmax;
 593         int changed;
 594
 595         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 596         changed = 0;
 597         rmin = rmax = 0;
 598         list_for_each(p, &subs->fmt_list) {
 599                 struct audioformat *fp;
 600                 fp = list_entry(p, struct audioformat, list);
 601                 if (!hw_check_valid_format(subs, params, fp))
 602                         continue;
 603                 if (changed++) {
 604                         if (rmin > fp->channels)
 605                                 rmin = fp->channels;
 606                         if (rmax < fp->channels)
 607                                 rmax = fp->channels;
 608                 } else {
 609                         rmin = fp->channels;
 610                         rmax = fp->channels;
 611                 }
 612         }
 613
 614         if (!changed) {
 615                 hwc_debug("  --> get empty\n");
 616                 it->empty = 1;
 617                 return -EINVAL;
 618         }
 619
 620         changed = 0;
 621         if (it->min < rmin) {
 622                 it->min = rmin;
 623                 it->openmin = 0;
 624                 changed = 1;
 625         }
 626         if (it->max > rmax) {
 627                 it->max = rmax;
 628                 it->openmax = 0;
 629                 changed = 1;
 630         }
 631         if (snd_interval_checkempty(it)) {
 632                 it->empty = 1;
 633                 return -EINVAL;
 634         }
 635         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 636         return changed;
 637 }
 638
 639 static int hw_rule_format(struct snd_pcm_hw_params *params,
 640                           struct snd_pcm_hw_rule *rule)
 641 {
 642         struct snd_usb_substream *subs = rule->private;
 643         struct list_head *p;
 644         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 645         u64 fbits;
 646         u32 oldbits[2];
 647         int changed;
 648
 649         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 650         fbits = 0;
 651         list_for_each(p, &subs->fmt_list) {
 652                 struct audioformat *fp;
 653                 fp = list_entry(p, struct audioformat, list);
 654                 if (!hw_check_valid_format(subs, params, fp))
 655                         continue;
 656                 fbits |= fp->formats;
 657         }
 658
 659         oldbits[0] = fmt->bits[0];
 660         oldbits[1] = fmt->bits[1];
 661         fmt->bits[0] &= (u32)fbits;
 662         fmt->bits[1] &= (u32)(fbits >> 32);
 663         if (!fmt->bits[0] && !fmt->bits[1]) {
 664                 hwc_debug("  --> get empty\n");
 665                 return -EINVAL;
 666         }
 667         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 668         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 669         return changed;
 670 }
 671
 672 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 673                                struct snd_pcm_hw_rule *rule)
 674 {
 675         struct snd_usb_substream *subs = rule->private;
 676         struct audioformat *fp;
 677         struct snd_interval *it;
 678         unsigned char min_datainterval;
 679         unsigned int pmin;
 680         int changed;
 681
 682         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 683         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 684         min_datainterval = 0xff;
 685         list_for_each_entry(fp, &subs->fmt_list, list) {
 686                 if (!hw_check_valid_format(subs, params, fp))
 687                         continue;
 688                 min_datainterval = min(min_datainterval, fp->datainterval);
 689         }
 690         if (min_datainterval == 0xff) {
 691                 hwc_debug("  --> get empty\n");
 692                 it->empty = 1;
 693                 return -EINVAL;
 694         }
 695         pmin = 125 * (1 << min_datainterval);
 696         changed = 0;
 697         if (it->min < pmin) {
 698                 it->min = pmin;
 699                 it->openmin = 0;
 700                 changed = 1;
 701         }
 702         if (snd_interval_checkempty(it)) {
 703                 it->empty = 1;
 704                 return -EINVAL;
 705         }
 706         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 707         return changed;
 708 }
 709
 710 /*
 711  *  If the device supports unusual bit rates, does the request meet these?
 712  */
 713 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 714                                   struct snd_usb_substream *subs)
 715 {
 716         struct audioformat *fp;
 717         int count = 0, needs_knot = 0;
 718         int err;
 719
 720         kfree(subs->rate_list.list);
 721         subs->rate_list.list = NULL;
 722
 723         list_for_each_entry(fp, &subs->fmt_list, list) {
 724                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 725                         return 0;
 726                 count += fp->nr_rates;
 727                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 728                         needs_knot = 1;
 729         }
 730         if (!needs_knot)
 731                 return 0;
 732
 733         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 734         if (!subs->rate_list.list)
 735                 return -ENOMEM;
 736         subs->rate_list.count = count;
 737         subs->rate_list.mask = 0;
 738         count = 0;
 739         list_for_each_entry(fp, &subs->fmt_list, list) {
 740                 int i;
 741                 for (i = 0; i < fp->nr_rates; i++)
 742                         subs->rate_list.list[count++] = fp->rate_table[i];
 743         }
 744         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 745                                          &subs->rate_list);
 746         if (err < 0)
 747                 return err;
 748
 749         return 0;
 750 }
 751
 752
 753 /*
 754  * set up the runtime hardware information.
 755  */
 756
 757 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 758 {
 759         struct list_head *p;
 760         unsigned int pt, ptmin;
 761         int param_period_time_if_needed;
 762         int err;
 763
 764         runtime->hw.formats = subs->formats;
 765
 766         runtime->hw.rate_min = 0x7fffffff;
 767         runtime->hw.rate_max = 0;
 768         runtime->hw.channels_min = 256;
 769         runtime->hw.channels_max = 0;
 770         runtime->hw.rates = 0;
 771         ptmin = UINT_MAX;
 772         /* check min/max rates and channels */
 773         list_for_each(p, &subs->fmt_list) {
 774                 struct audioformat *fp;
 775                 fp = list_entry(p, struct audioformat, list);
 776                 runtime->hw.rates |= fp->rates;
 777                 if (runtime->hw.rate_min > fp->rate_min)
 778                         runtime->hw.rate_min = fp->rate_min;
 779                 if (runtime->hw.rate_max < fp->rate_max)
 780                         runtime->hw.rate_max = fp->rate_max;
 781                 if (runtime->hw.channels_min > fp->channels)
 782                         runtime->hw.channels_min = fp->channels;
 783                 if (runtime->hw.channels_max < fp->channels)
 784                         runtime->hw.channels_max = fp->channels;
 785                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 786                         /* FIXME: there might be more than one audio formats... */
 787                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 788                                 fp->frame_size;
 789                 }
 790                 pt = 125 * (1 << fp->datainterval);
 791                 ptmin = min(ptmin, pt);
 792         }
 793         err = snd_usb_autoresume(subs->stream->chip);
 794         if (err < 0)
 795                 return err;
 796
 797         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 798         if (subs->speed == USB_SPEED_FULL)
 799                 /* full speed devices have fixed data packet interval */
 800                 ptmin = 1000;
 801         if (ptmin == 1000)
 802                 /* if period time doesn't go below 1 ms, no rules needed */
 803                 param_period_time_if_needed = -1;
 804         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 805                                      ptmin, UINT_MAX);
 806
 807         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 808                                        hw_rule_rate, subs,
 809                                        SNDRV_PCM_HW_PARAM_FORMAT,
 810                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 811                                        param_period_time_if_needed,
 812                                        -1)) < 0)
 813                 goto rep_err;
 814         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 815                                        hw_rule_channels, subs,
 816                                        SNDRV_PCM_HW_PARAM_FORMAT,
 817                                        SNDRV_PCM_HW_PARAM_RATE,
 818                                        param_period_time_if_needed,
 819                                        -1)) < 0)
 820                 goto rep_err;
 821         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 822                                        hw_rule_format, subs,
 823                                        SNDRV_PCM_HW_PARAM_RATE,
 824                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 825                                        param_period_time_if_needed,
 826                                        -1)) < 0)
 827                 goto rep_err;
 828         if (param_period_time_if_needed >= 0) {
 829                 err = snd_pcm_hw_rule_add(runtime, 0,
 830                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 831                                           hw_rule_period_time, subs,
 832                                           SNDRV_PCM_HW_PARAM_FORMAT,
 833                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 834                                           SNDRV_PCM_HW_PARAM_RATE,
 835                                           -1);
 836                 if (err < 0)
 837                         goto rep_err;
 838         }
 839         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 840                 goto rep_err;
 841         return 0;
 842
 843 rep_err:
 844         snd_usb_autosuspend(subs->stream->chip);
 845         return err;
 846 }
 847
 848 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 849 {
 850         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 851         struct snd_pcm_runtime *runtime = substream->runtime;
 852         struct snd_usb_substream *subs = &as->substream[direction];
 853
 854         subs->interface = -1;
 855         subs->altset_idx = 0;
 856         runtime->hw = snd_usb_hardware;
 857         runtime->private_data = subs;
 858         subs->pcm_substream = substream;
 859         /* runtime PM is also done there */
 860         return setup_hw_info(runtime, subs);
 861 }
 862
 863 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 864 {
 865         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 866         struct snd_usb_substream *subs = &as->substream[direction];
 867
 868         if (!as->chip->shutdown && subs->interface >= 0) {
 869                 usb_set_interface(subs->dev, subs->interface, 0);
 870                 subs->interface = -1;
 871         }
 872         subs->pcm_substream = NULL;
 873         snd_usb_autosuspend(subs->stream->chip);
 874         return 0;
 875 }
 876
 877 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 878 {
 879         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 880 }
 881
 882 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 883 {
 884         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 885 }
 886
 887 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 888 {
 889         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 890 }
 891
 892 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 893 {
 894         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 895 }
 896
 897 static struct snd_pcm_ops snd_usb_playback_ops = {
 898         .open =         snd_usb_playback_open,
 899         .close =        snd_usb_playback_close,
 900         .ioctl =        snd_pcm_lib_ioctl,
 901         .hw_params =    snd_usb_hw_params,
 902         .hw_free =      snd_usb_hw_free,
 903         .prepare =      snd_usb_pcm_prepare,
 904         .trigger =      snd_usb_substream_playback_trigger,
 905         .pointer =      snd_usb_pcm_pointer,
 906         .page =         snd_pcm_lib_get_vmalloc_page,
 907         .mmap =         snd_pcm_lib_mmap_vmalloc,
 908 };
 909
 910 static struct snd_pcm_ops snd_usb_capture_ops = {
 911         .open =         snd_usb_capture_open,
 912         .close =        snd_usb_capture_close,
 913         .ioctl =        snd_pcm_lib_ioctl,
 914         .hw_params =    snd_usb_hw_params,
 915         .hw_free =      snd_usb_hw_free,
 916         .prepare =      snd_usb_pcm_prepare,
 917         .trigger =      snd_usb_substream_capture_trigger,
 918         .pointer =      snd_usb_pcm_pointer,
 919         .page =         snd_pcm_lib_get_vmalloc_page,
 920         .mmap =         snd_pcm_lib_mmap_vmalloc,
 921 };
 922
 923 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 924 {
 925         snd_pcm_set_ops(pcm, stream,
 926                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 927                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 928 }