sound/usb/pcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/audio.h>
  21 #include <linux/usb/audio-v2.h>
  22
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26
  27 #include "usbaudio.h"
  28 #include "card.h"
  29 #include "quirks.h"
  30 #include "debug.h"
  31 #include "urb.h"
  32 #include "helper.h"
  33 #include "pcm.h"
  34 #include "clock.h"
  35
  36 /*
  37  * return the current pcm pointer.  just based on the hwptr_done value.
  38  */
  39 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  40 {
  41         struct snd_usb_substream *subs;
  42         unsigned int hwptr_done;
  43
  44         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  45         spin_lock(&subs->lock);
  46         hwptr_done = subs->hwptr_done;
  47         spin_unlock(&subs->lock);
  48         return hwptr_done / (substream->runtime->frame_bits >> 3);
  49 }
  50
  51 /*
  52  * find a matching audio format
  53  */
  54 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  55                                        unsigned int rate, unsigned int channels)
  56 {
  57         struct list_head *p;
  58         struct audioformat *found = NULL;
  59         int cur_attr = 0, attr;
  60
  61         list_for_each(p, &subs->fmt_list) {
  62                 struct audioformat *fp;
  63                 fp = list_entry(p, struct audioformat, list);
  64                 if (!(fp->formats & (1uLL << format)))
  65                         continue;
  66                 if (fp->channels != channels)
  67                         continue;
  68                 if (rate < fp->rate_min || rate > fp->rate_max)
  69                         continue;
  70                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  71                         unsigned int i;
  72                         for (i = 0; i < fp->nr_rates; i++)
  73                                 if (fp->rate_table[i] == rate)
  74                                         break;
  75                         if (i >= fp->nr_rates)
  76                                 continue;
  77                 }
  78                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  79                 if (! found) {
  80                         found = fp;
  81                         cur_attr = attr;
  82                         continue;
  83                 }
  84                 /* avoid async out and adaptive in if the other method
  85                  * supports the same format.
  86                  * this is a workaround for the case like
  87                  * M-audio audiophile USB.
  88                  */
  89                 if (attr != cur_attr) {
  90                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  91                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  92                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  93                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  94                                 continue;
  95                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  96                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  97                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  98                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
  99                                 found = fp;
 100                                 cur_attr = attr;
 101                                 continue;
 102                         }
 103                 }
 104                 /* find the format with the largest max. packet size */
 105                 if (fp->maxpacksize > found->maxpacksize) {
 106                         found = fp;
 107                         cur_attr = attr;
 108                 }
 109         }
 110         return found;
 111 }
 112
 113 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 114                          struct usb_host_interface *alts,
 115                          struct audioformat *fmt)
 116 {
 117         struct usb_device *dev = chip->dev;
 118         unsigned int ep;
 119         unsigned char data[1];
 120         int err;
 121
 122         ep = get_endpoint(alts, 0)->bEndpointAddress;
 123
 124         data[0] = 1;
 125         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 126                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 127                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 128                                    data, sizeof(data), 1000)) < 0) {
 129                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 130                            dev->devnum, iface, ep);
 131                 return err;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 138                          struct usb_host_interface *alts,
 139                          struct audioformat *fmt)
 140 {
 141         struct usb_device *dev = chip->dev;
 142         unsigned char data[1];
 143         unsigned int ep;
 144         int err;
 145
 146         ep = get_endpoint(alts, 0)->bEndpointAddress;
 147
 148         data[0] = 1;
 149         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 150                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 151                                    UAC2_EP_CS_PITCH << 8, 0,
 152                                    data, sizeof(data), 1000)) < 0) {
 153                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 154                            dev->devnum, iface, fmt->altsetting);
 155                 return err;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /*
 162  * initialize the pitch control and sample rate
 163  */
 164 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 165                        struct usb_host_interface *alts,
 166                        struct audioformat *fmt)
 167 {
 168         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 169
 170         /* if endpoint doesn't have pitch control, bail out */
 171         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 172                 return 0;
 173
 174         switch (altsd->bInterfaceProtocol) {
 175         case UAC_VERSION_1:
 176         default:
 177                 return init_pitch_v1(chip, iface, alts, fmt);
 178
 179         case UAC_VERSION_2:
 180                 return init_pitch_v2(chip, iface, alts, fmt);
 181         }
 182 }
 183
 184 /*
 185  * find a matching format and set up the interface
 186  */
 187 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 188 {
 189         struct usb_device *dev = subs->dev;
 190         struct usb_host_interface *alts;
 191         struct usb_interface_descriptor *altsd;
 192         struct usb_interface *iface;
 193         unsigned int ep, attr;
 194         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 195         int err;
 196
 197         iface = usb_ifnum_to_if(dev, fmt->iface);
 198         if (WARN_ON(!iface))
 199                 return -EINVAL;
 200         alts = &iface->altsetting[fmt->altset_idx];
 201         altsd = get_iface_desc(alts);
 202         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 203                 return -EINVAL;
 204
 205         if (fmt == subs->cur_audiofmt)
 206                 return 0;
 207
 208         /* close the old interface */
 209         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 210                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 211                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 212                                 dev->devnum, fmt->iface, fmt->altsetting);
 213                         return -EIO;
 214                 }
 215                 subs->interface = -1;
 216                 subs->altset_idx = 0;
 217         }
 218
 219         /* set interface */
 220         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 221                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 222                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 223                                    dev->devnum, fmt->iface, fmt->altsetting);
 224                         return -EIO;
 225                 }
 226                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 227                 subs->interface = fmt->iface;
 228                 subs->altset_idx = fmt->altset_idx;
 229         }
 230
 231         /* create a data pipe */
 232         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 233         if (is_playback)
 234                 subs->datapipe = usb_sndisocpipe(dev, ep);
 235         else
 236                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 237         subs->datainterval = fmt->datainterval;
 238         subs->syncpipe = subs->syncinterval = 0;
 239         subs->maxpacksize = fmt->maxpacksize;
 240         subs->syncmaxsize = 0;
 241         subs->fill_max = 0;
 242
 243         /* we need a sync pipe in async OUT or adaptive IN mode */
 244         /* check the number of EP, since some devices have broken
 245          * descriptors which fool us.  if it has only one EP,
 246          * assume it as adaptive-out or sync-in.
 247          */
 248         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 249         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 250              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 251             altsd->bNumEndpoints >= 2) {
 252                 /* check sync-pipe endpoint */
 253                 /* ... and check descriptor size before accessing bSynchAddress
 254                    because there is a version of the SB Audigy 2 NX firmware lacking
 255                    the audio fields in the endpoint descriptors */
 256                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 257                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 258                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 259                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 260                                    dev->devnum, fmt->iface, fmt->altsetting);
 261                         return -EINVAL;
 262                 }
 263                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 264                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 265                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 266                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 267                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 268                                    dev->devnum, fmt->iface, fmt->altsetting);
 269                         return -EINVAL;
 270                 }
 271                 ep &= USB_ENDPOINT_NUMBER_MASK;
 272                 if (is_playback)
 273                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 274                 else
 275                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 276                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 277                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 278                     get_endpoint(alts, 1)->bRefresh <= 9)
 279                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 280                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 281                         subs->syncinterval = 1;
 282                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 283                          get_endpoint(alts, 1)->bInterval <= 16)
 284                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 285                 else
 286                         subs->syncinterval = 3;
 287                 subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
 288         }
 289
 290         /* always fill max packet size */
 291         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 292                 subs->fill_max = 1;
 293
 294         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 295                 return err;
 296
 297         subs->cur_audiofmt = fmt;
 298
 299         snd_usb_set_format_quirk(subs, fmt);
 300
 301 #if 0
 302         printk(KERN_DEBUG
 303                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 304                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 305         printk(KERN_DEBUG
 306                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 307                subs->datapipe, subs->syncpipe);
 308 #endif
 309
 310         return 0;
 311 }
 312
 313 /*
 314  * hw_params callback
 315  *
 316  * allocate a buffer and set the given audio format.
 317  *
 318  * so far we use a physically linear buffer although packetize transfer
 319  * doesn't need a continuous area.
 320  * if sg buffer is supported on the later version of alsa, we'll follow
 321  * that.
 322  */
 323 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 324                              struct snd_pcm_hw_params *hw_params)
 325 {
 326         struct snd_usb_substream *subs = substream->runtime->private_data;
 327         struct audioformat *fmt;
 328         unsigned int channels, rate, format;
 329         int ret, changed;
 330
 331         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 332                                                params_buffer_bytes(hw_params));
 333         if (ret < 0)
 334                 return ret;
 335
 336         format = params_format(hw_params);
 337         rate = params_rate(hw_params);
 338         channels = params_channels(hw_params);
 339         fmt = find_format(subs, format, rate, channels);
 340         if (!fmt) {
 341                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 342                            format, rate, channels);
 343                 return -EINVAL;
 344         }
 345
 346         changed = subs->cur_audiofmt != fmt ||
 347                 subs->period_bytes != params_period_bytes(hw_params) ||
 348                 subs->cur_rate != rate;
 349         if ((ret = set_format(subs, fmt)) < 0)
 350                 return ret;
 351
 352         if (subs->cur_rate != rate) {
 353                 struct usb_host_interface *alts;
 354                 struct usb_interface *iface;
 355                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 356                 alts = &iface->altsetting[fmt->altset_idx];
 357                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 358                 if (ret < 0)
 359                         return ret;
 360                 subs->cur_rate = rate;
 361         }
 362
 363         if (changed) {
 364                 mutex_lock(&subs->stream->chip->shutdown_mutex);
 365                 /* format changed */
 366                 snd_usb_release_substream_urbs(subs, 0);
 367                 /* influenced: period_bytes, channels, rate, format, */
 368                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 369                                                   params_rate(hw_params),
 370                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 371                                                         params_channels(hw_params));
 372                 mutex_unlock(&subs->stream->chip->shutdown_mutex);
 373         }
 374
 375         return ret;
 376 }
 377
 378 /*
 379  * hw_free callback
 380  *
 381  * reset the audio format and release the buffer
 382  */
 383 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 384 {
 385         struct snd_usb_substream *subs = substream->runtime->private_data;
 386
 387         subs->cur_audiofmt = NULL;
 388         subs->cur_rate = 0;
 389         subs->period_bytes = 0;
 390         mutex_lock(&subs->stream->chip->shutdown_mutex);
 391         snd_usb_release_substream_urbs(subs, 0);
 392         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 393         return snd_pcm_lib_free_vmalloc_buffer(substream);
 394 }
 395
 396 /*
 397  * prepare callback
 398  *
 399  * only a few subtle things...
 400  */
 401 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 402 {
 403         struct snd_pcm_runtime *runtime = substream->runtime;
 404         struct snd_usb_substream *subs = runtime->private_data;
 405
 406         if (! subs->cur_audiofmt) {
 407                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 408                 return -ENXIO;
 409         }
 410
 411         /* some unit conversions in runtime */
 412         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 413         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 414
 415         /* reset the pointer */
 416         subs->hwptr_done = 0;
 417         subs->transfer_done = 0;
 418         subs->phase = 0;
 419         runtime->delay = 0;
 420
 421         return snd_usb_substream_prepare(subs, runtime);
 422 }
 423
 424 static struct snd_pcm_hardware snd_usb_hardware =
 425 {
 426         .info =                 SNDRV_PCM_INFO_MMAP |
 427                                 SNDRV_PCM_INFO_MMAP_VALID |
 428                                 SNDRV_PCM_INFO_BATCH |
 429                                 SNDRV_PCM_INFO_INTERLEAVED |
 430                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 431                                 SNDRV_PCM_INFO_PAUSE,
 432         .buffer_bytes_max =     1024 * 1024,
 433         .period_bytes_min =     64,
 434         .period_bytes_max =     512 * 1024,
 435         .periods_min =          2,
 436         .periods_max =          1024,
 437 };
 438
 439 static int hw_check_valid_format(struct snd_usb_substream *subs,
 440                                  struct snd_pcm_hw_params *params,
 441                                  struct audioformat *fp)
 442 {
 443         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 444         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 445         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 446         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 447         struct snd_mask check_fmts;
 448         unsigned int ptime;
 449
 450         /* check the format */
 451         snd_mask_none(&check_fmts);
 452         check_fmts.bits[0] = (u32)fp->formats;
 453         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 454         snd_mask_intersect(&check_fmts, fmts);
 455         if (snd_mask_empty(&check_fmts)) {
 456                 hwc_debug("   > check: no supported format %d\n", fp->format);
 457                 return 0;
 458         }
 459         /* check the channels */
 460         if (fp->channels < ct->min || fp->channels > ct->max) {
 461                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 462                 return 0;
 463         }
 464         /* check the rate is within the range */
 465         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 466                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 467                 return 0;
 468         }
 469         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 470                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 471                 return 0;
 472         }
 473         /* check whether the period time is >= the data packet interval */
 474         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 475                 ptime = 125 * (1 << fp->datainterval);
 476                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 477                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 478                         return 0;
 479                 }
 480         }
 481         return 1;
 482 }
 483
 484 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 485                         struct snd_pcm_hw_rule *rule)
 486 {
 487         struct snd_usb_substream *subs = rule->private;
 488         struct list_head *p;
 489         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 490         unsigned int rmin, rmax;
 491         int changed;
 492
 493         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 494         changed = 0;
 495         rmin = rmax = 0;
 496         list_for_each(p, &subs->fmt_list) {
 497                 struct audioformat *fp;
 498                 fp = list_entry(p, struct audioformat, list);
 499                 if (!hw_check_valid_format(subs, params, fp))
 500                         continue;
 501                 if (changed++) {
 502                         if (rmin > fp->rate_min)
 503                                 rmin = fp->rate_min;
 504                         if (rmax < fp->rate_max)
 505                                 rmax = fp->rate_max;
 506                 } else {
 507                         rmin = fp->rate_min;
 508                         rmax = fp->rate_max;
 509                 }
 510         }
 511
 512         if (!changed) {
 513                 hwc_debug("  --> get empty\n");
 514                 it->empty = 1;
 515                 return -EINVAL;
 516         }
 517
 518         changed = 0;
 519         if (it->min < rmin) {
 520                 it->min = rmin;
 521                 it->openmin = 0;
 522                 changed = 1;
 523         }
 524         if (it->max > rmax) {
 525                 it->max = rmax;
 526                 it->openmax = 0;
 527                 changed = 1;
 528         }
 529         if (snd_interval_checkempty(it)) {
 530                 it->empty = 1;
 531                 return -EINVAL;
 532         }
 533         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 534         return changed;
 535 }
 536
 537
 538 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 539                             struct snd_pcm_hw_rule *rule)
 540 {
 541         struct snd_usb_substream *subs = rule->private;
 542         struct list_head *p;
 543         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 544         unsigned int rmin, rmax;
 545         int changed;
 546
 547         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 548         changed = 0;
 549         rmin = rmax = 0;
 550         list_for_each(p, &subs->fmt_list) {
 551                 struct audioformat *fp;
 552                 fp = list_entry(p, struct audioformat, list);
 553                 if (!hw_check_valid_format(subs, params, fp))
 554                         continue;
 555                 if (changed++) {
 556                         if (rmin > fp->channels)
 557                                 rmin = fp->channels;
 558                         if (rmax < fp->channels)
 559                                 rmax = fp->channels;
 560                 } else {
 561                         rmin = fp->channels;
 562                         rmax = fp->channels;
 563                 }
 564         }
 565
 566         if (!changed) {
 567                 hwc_debug("  --> get empty\n");
 568                 it->empty = 1;
 569                 return -EINVAL;
 570         }
 571
 572         changed = 0;
 573         if (it->min < rmin) {
 574                 it->min = rmin;
 575                 it->openmin = 0;
 576                 changed = 1;
 577         }
 578         if (it->max > rmax) {
 579                 it->max = rmax;
 580                 it->openmax = 0;
 581                 changed = 1;
 582         }
 583         if (snd_interval_checkempty(it)) {
 584                 it->empty = 1;
 585                 return -EINVAL;
 586         }
 587         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 588         return changed;
 589 }
 590
 591 static int hw_rule_format(struct snd_pcm_hw_params *params,
 592                           struct snd_pcm_hw_rule *rule)
 593 {
 594         struct snd_usb_substream *subs = rule->private;
 595         struct list_head *p;
 596         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 597         u64 fbits;
 598         u32 oldbits[2];
 599         int changed;
 600
 601         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 602         fbits = 0;
 603         list_for_each(p, &subs->fmt_list) {
 604                 struct audioformat *fp;
 605                 fp = list_entry(p, struct audioformat, list);
 606                 if (!hw_check_valid_format(subs, params, fp))
 607                         continue;
 608                 fbits |= fp->formats;
 609         }
 610
 611         oldbits[0] = fmt->bits[0];
 612         oldbits[1] = fmt->bits[1];
 613         fmt->bits[0] &= (u32)fbits;
 614         fmt->bits[1] &= (u32)(fbits >> 32);
 615         if (!fmt->bits[0] && !fmt->bits[1]) {
 616                 hwc_debug("  --> get empty\n");
 617                 return -EINVAL;
 618         }
 619         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 620         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 621         return changed;
 622 }
 623
 624 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 625                                struct snd_pcm_hw_rule *rule)
 626 {
 627         struct snd_usb_substream *subs = rule->private;
 628         struct audioformat *fp;
 629         struct snd_interval *it;
 630         unsigned char min_datainterval;
 631         unsigned int pmin;
 632         int changed;
 633
 634         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 635         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 636         min_datainterval = 0xff;
 637         list_for_each_entry(fp, &subs->fmt_list, list) {
 638                 if (!hw_check_valid_format(subs, params, fp))
 639                         continue;
 640                 min_datainterval = min(min_datainterval, fp->datainterval);
 641         }
 642         if (min_datainterval == 0xff) {
 643                 hwc_debug("  --> get empty\n");
 644                 it->empty = 1;
 645                 return -EINVAL;
 646         }
 647         pmin = 125 * (1 << min_datainterval);
 648         changed = 0;
 649         if (it->min < pmin) {
 650                 it->min = pmin;
 651                 it->openmin = 0;
 652                 changed = 1;
 653         }
 654         if (snd_interval_checkempty(it)) {
 655                 it->empty = 1;
 656                 return -EINVAL;
 657         }
 658         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 659         return changed;
 660 }
 661
 662 /*
 663  *  If the device supports unusual bit rates, does the request meet these?
 664  */
 665 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 666                                   struct snd_usb_substream *subs)
 667 {
 668         struct audioformat *fp;
 669         int count = 0, needs_knot = 0;
 670         int err;
 671
 672         list_for_each_entry(fp, &subs->fmt_list, list) {
 673                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 674                         return 0;
 675                 count += fp->nr_rates;
 676                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 677                         needs_knot = 1;
 678         }
 679         if (!needs_knot)
 680                 return 0;
 681
 682         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 683         if (!subs->rate_list.list)
 684                 return -ENOMEM;
 685         subs->rate_list.count = count;
 686         subs->rate_list.mask = 0;
 687         count = 0;
 688         list_for_each_entry(fp, &subs->fmt_list, list) {
 689                 int i;
 690                 for (i = 0; i < fp->nr_rates; i++)
 691                         subs->rate_list.list[count++] = fp->rate_table[i];
 692         }
 693         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 694                                          &subs->rate_list);
 695         if (err < 0)
 696                 return err;
 697
 698         return 0;
 699 }
 700
 701
 702 /*
 703  * set up the runtime hardware information.
 704  */
 705
 706 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 707 {
 708         struct list_head *p;
 709         unsigned int pt, ptmin;
 710         int param_period_time_if_needed;
 711         int err;
 712
 713         runtime->hw.formats = subs->formats;
 714
 715         runtime->hw.rate_min = 0x7fffffff;
 716         runtime->hw.rate_max = 0;
 717         runtime->hw.channels_min = 256;
 718         runtime->hw.channels_max = 0;
 719         runtime->hw.rates = 0;
 720         ptmin = UINT_MAX;
 721         /* check min/max rates and channels */
 722         list_for_each(p, &subs->fmt_list) {
 723                 struct audioformat *fp;
 724                 fp = list_entry(p, struct audioformat, list);
 725                 runtime->hw.rates |= fp->rates;
 726                 if (runtime->hw.rate_min > fp->rate_min)
 727                         runtime->hw.rate_min = fp->rate_min;
 728                 if (runtime->hw.rate_max < fp->rate_max)
 729                         runtime->hw.rate_max = fp->rate_max;
 730                 if (runtime->hw.channels_min > fp->channels)
 731                         runtime->hw.channels_min = fp->channels;
 732                 if (runtime->hw.channels_max < fp->channels)
 733                         runtime->hw.channels_max = fp->channels;
 734                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 735                         /* FIXME: there might be more than one audio formats... */
 736                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 737                                 fp->frame_size;
 738                 }
 739                 pt = 125 * (1 << fp->datainterval);
 740                 ptmin = min(ptmin, pt);
 741         }
 742
 743         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 744         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 745                 /* full speed devices have fixed data packet interval */
 746                 ptmin = 1000;
 747         if (ptmin == 1000)
 748                 /* if period time doesn't go below 1 ms, no rules needed */
 749                 param_period_time_if_needed = -1;
 750         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 751                                      ptmin, UINT_MAX);
 752
 753         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 754                                        hw_rule_rate, subs,
 755                                        SNDRV_PCM_HW_PARAM_FORMAT,
 756                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 757                                        param_period_time_if_needed,
 758                                        -1)) < 0)
 759                 return err;
 760         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 761                                        hw_rule_channels, subs,
 762                                        SNDRV_PCM_HW_PARAM_FORMAT,
 763                                        SNDRV_PCM_HW_PARAM_RATE,
 764                                        param_period_time_if_needed,
 765                                        -1)) < 0)
 766                 return err;
 767         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 768                                        hw_rule_format, subs,
 769                                        SNDRV_PCM_HW_PARAM_RATE,
 770                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 771                                        param_period_time_if_needed,
 772                                        -1)) < 0)
 773                 return err;
 774         if (param_period_time_if_needed >= 0) {
 775                 err = snd_pcm_hw_rule_add(runtime, 0,
 776                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 777                                           hw_rule_period_time, subs,
 778                                           SNDRV_PCM_HW_PARAM_FORMAT,
 779                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 780                                           SNDRV_PCM_HW_PARAM_RATE,
 781                                           -1);
 782                 if (err < 0)
 783                         return err;
 784         }
 785         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 786                 return err;
 787         return 0;
 788 }
 789
 790 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 791 {
 792         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 793         struct snd_pcm_runtime *runtime = substream->runtime;
 794         struct snd_usb_substream *subs = &as->substream[direction];
 795
 796         subs->interface = -1;
 797         subs->altset_idx = 0;
 798         runtime->hw = snd_usb_hardware;
 799         runtime->private_data = subs;
 800         subs->pcm_substream = substream;
 801         return setup_hw_info(runtime, subs);
 802 }
 803
 804 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 805 {
 806         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 807         struct snd_usb_substream *subs = &as->substream[direction];
 808
 809         if (!as->chip->shutdown && subs->interface >= 0) {
 810                 usb_set_interface(subs->dev, subs->interface, 0);
 811                 subs->interface = -1;
 812         }
 813         subs->pcm_substream = NULL;
 814         return 0;
 815 }
 816
 817 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 818 {
 819         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 820 }
 821
 822 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 823 {
 824         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 825 }
 826
 827 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 828 {
 829         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 830 }
 831
 832 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 833 {
 834         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 835 }
 836
 837 static struct snd_pcm_ops snd_usb_playback_ops = {
 838         .open =         snd_usb_playback_open,
 839         .close =        snd_usb_playback_close,
 840         .ioctl =        snd_pcm_lib_ioctl,
 841         .hw_params =    snd_usb_hw_params,
 842         .hw_free =      snd_usb_hw_free,
 843         .prepare =      snd_usb_pcm_prepare,
 844         .trigger =      snd_usb_substream_playback_trigger,
 845         .pointer =      snd_usb_pcm_pointer,
 846         .page =         snd_pcm_lib_get_vmalloc_page,
 847         .mmap =         snd_pcm_lib_mmap_vmalloc,
 848 };
 849
 850 static struct snd_pcm_ops snd_usb_capture_ops = {
 851         .open =         snd_usb_capture_open,
 852         .close =        snd_usb_capture_close,
 853         .ioctl =        snd_pcm_lib_ioctl,
 854         .hw_params =    snd_usb_hw_params,
 855         .hw_free =      snd_usb_hw_free,
 856         .prepare =      snd_usb_pcm_prepare,
 857         .trigger =      snd_usb_substream_capture_trigger,
 858         .pointer =      snd_usb_pcm_pointer,
 859         .page =         snd_pcm_lib_get_vmalloc_page,
 860         .mmap =         snd_pcm_lib_mmap_vmalloc,
 861 };
 862
 863 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 864 {
 865         snd_pcm_set_ops(pcm, stream,
 866                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 867                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 868 }