sound/core/pcm.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <sound/core.h>
  27 #include <sound/minors.h>
  28 #include <sound/pcm.h>
  29 #include <sound/control.h>
  30 #include <sound/info.h>
  31
  32 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  34 MODULE_LICENSE("GPL");
  35
  36 static LIST_HEAD(snd_pcm_devices);
  37 static LIST_HEAD(snd_pcm_notify_list);
  38 static DECLARE_MUTEX(register_mutex);
  39
  40 static int snd_pcm_free(struct snd_pcm *pcm);
  41 static int snd_pcm_dev_free(struct snd_device *device);
  42 static int snd_pcm_dev_register(struct snd_device *device);
  43 static int snd_pcm_dev_disconnect(struct snd_device *device);
  44 static int snd_pcm_dev_unregister(struct snd_device *device);
  45
  46 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
  47 {
  48         struct list_head *p;
  49         struct snd_pcm *pcm;
  50
  51         list_for_each(p, &snd_pcm_devices) {
  52                 pcm = list_entry(p, struct snd_pcm, list);
  53                 if (pcm->card == card && pcm->device == device)
  54                         return pcm;
  55         }
  56         return NULL;
  57 }
  58
  59 static int snd_pcm_control_ioctl(struct snd_card *card,
  60                                  struct snd_ctl_file *control,
  61                                  unsigned int cmd, unsigned long arg)
  62 {
  63         switch (cmd) {
  64         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  65                 {
  66                         int device;
  67
  68                         if (get_user(device, (int __user *)arg))
  69                                 return -EFAULT;
  70                         down(&register_mutex);
  71                         device = device < 0 ? 0 : device + 1;
  72                         while (device < SNDRV_PCM_DEVICES) {
  73                                 if (snd_pcm_search(card, device))
  74                                         break;
  75                                 device++;
  76                         }
  77                         if (device == SNDRV_PCM_DEVICES)
  78                                 device = -1;
  79                         up(&register_mutex);
  80                         if (put_user(device, (int __user *)arg))
  81                                 return -EFAULT;
  82                         return 0;
  83                 }
  84         case SNDRV_CTL_IOCTL_PCM_INFO:
  85                 {
  86                         struct snd_pcm_info __user *info;
  87                         unsigned int device, subdevice;
  88                         int stream;
  89                         struct snd_pcm *pcm;
  90                         struct snd_pcm_str *pstr;
  91                         struct snd_pcm_substream *substream;
  92                         int err;
  93
  94                         info = (struct snd_pcm_info __user *)arg;
  95                         if (get_user(device, &info->device))
  96                                 return -EFAULT;
  97                         if (get_user(stream, &info->stream))
  98                                 return -EFAULT;
  99                         if (stream < 0 || stream > 1)
 100                                 return -EINVAL;
 101                         if (get_user(subdevice, &info->subdevice))
 102                                 return -EFAULT;
 103                         down(&register_mutex);
 104                         pcm = snd_pcm_search(card, device);
 105                         if (pcm == NULL) {
 106                                 err = -ENXIO;
 107                                 goto _error;
 108                         }
 109                         pstr = &pcm->streams[stream];
 110                         if (pstr->substream_count == 0) {
 111                                 err = -ENOENT;
 112                                 goto _error;
 113                         }
 114                         if (subdevice >= pstr->substream_count) {
 115                                 err = -ENXIO;
 116                                 goto _error;
 117                         }
 118                         for (substream = pstr->substream; substream;
 119                              substream = substream->next)
 120                                 if (substream->number == (int)subdevice)
 121                                         break;
 122                         if (substream == NULL) {
 123                                 err = -ENXIO;
 124                                 goto _error;
 125                         }
 126                         err = snd_pcm_info_user(substream, info);
 127                 _error:
 128                         up(&register_mutex);
 129                         return err;
 130                 }
 131         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 132                 {
 133                         int val;
 134
 135                         if (get_user(val, (int __user *)arg))
 136                                 return -EFAULT;
 137                         control->prefer_pcm_subdevice = val;
 138                         return 0;
 139                 }
 140         }
 141         return -ENOIOCTLCMD;
 142 }
 143
 144 #if defined(CONFIG_PROC_FS) && defined(CONFIG_SND_VERBOSE_PROCFS)
 145
 146 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 147 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 148 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 149 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 150 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 151 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 152 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 153 #define START(v) [SNDRV_PCM_START_##v] = #v
 154 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 155 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 156
 157 static char *snd_pcm_format_names[] = {
 158         FORMAT(S8),
 159         FORMAT(U8),
 160         FORMAT(S16_LE),
 161         FORMAT(S16_BE),
 162         FORMAT(U16_LE),
 163         FORMAT(U16_BE),
 164         FORMAT(S24_LE),
 165         FORMAT(S24_BE),
 166         FORMAT(U24_LE),
 167         FORMAT(U24_BE),
 168         FORMAT(S32_LE),
 169         FORMAT(S32_BE),
 170         FORMAT(U32_LE),
 171         FORMAT(U32_BE),
 172         FORMAT(FLOAT_LE),
 173         FORMAT(FLOAT_BE),
 174         FORMAT(FLOAT64_LE),
 175         FORMAT(FLOAT64_BE),
 176         FORMAT(IEC958_SUBFRAME_LE),
 177         FORMAT(IEC958_SUBFRAME_BE),
 178         FORMAT(MU_LAW),
 179         FORMAT(A_LAW),
 180         FORMAT(IMA_ADPCM),
 181         FORMAT(MPEG),
 182         FORMAT(GSM),
 183         FORMAT(SPECIAL),
 184         FORMAT(S24_3LE),
 185         FORMAT(S24_3BE),
 186         FORMAT(U24_3LE),
 187         FORMAT(U24_3BE),
 188         FORMAT(S20_3LE),
 189         FORMAT(S20_3BE),
 190         FORMAT(U20_3LE),
 191         FORMAT(U20_3BE),
 192         FORMAT(S18_3LE),
 193         FORMAT(S18_3BE),
 194         FORMAT(U18_3LE),
 195         FORMAT(U18_3BE),
 196 };
 197
 198 const char *snd_pcm_format_name(snd_pcm_format_t format)
 199 {
 200         return snd_pcm_format_names[format];
 201 }
 202
 203 static char *snd_pcm_stream_names[] = {
 204         STREAM(PLAYBACK),
 205         STREAM(CAPTURE),
 206 };
 207
 208 static char *snd_pcm_state_names[] = {
 209         STATE(OPEN),
 210         STATE(SETUP),
 211         STATE(PREPARED),
 212         STATE(RUNNING),
 213         STATE(XRUN),
 214         STATE(DRAINING),
 215         STATE(PAUSED),
 216         STATE(SUSPENDED),
 217 };
 218
 219 static char *snd_pcm_access_names[] = {
 220         ACCESS(MMAP_INTERLEAVED),
 221         ACCESS(MMAP_NONINTERLEAVED),
 222         ACCESS(MMAP_COMPLEX),
 223         ACCESS(RW_INTERLEAVED),
 224         ACCESS(RW_NONINTERLEAVED),
 225 };
 226
 227 static char *snd_pcm_subformat_names[] = {
 228         SUBFORMAT(STD),
 229 };
 230
 231 static char *snd_pcm_tstamp_mode_names[] = {
 232         TSTAMP(NONE),
 233         TSTAMP(MMAP),
 234 };
 235
 236 static const char *snd_pcm_stream_name(int stream)
 237 {
 238         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 239         return snd_pcm_stream_names[stream];
 240 }
 241
 242 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 243 {
 244         return snd_pcm_access_names[access];
 245 }
 246
 247 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 248 {
 249         return snd_pcm_subformat_names[subformat];
 250 }
 251
 252 static const char *snd_pcm_tstamp_mode_name(int mode)
 253 {
 254         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 255         return snd_pcm_tstamp_mode_names[mode];
 256 }
 257
 258 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 259 {
 260         return snd_pcm_state_names[state];
 261 }
 262
 263 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 264 #include <linux/soundcard.h>
 265 static const char *snd_pcm_oss_format_name(int format)
 266 {
 267         switch (format) {
 268         case AFMT_MU_LAW:
 269                 return "MU_LAW";
 270         case AFMT_A_LAW:
 271                 return "A_LAW";
 272         case AFMT_IMA_ADPCM:
 273                 return "IMA_ADPCM";
 274         case AFMT_U8:
 275                 return "U8";
 276         case AFMT_S16_LE:
 277                 return "S16_LE";
 278         case AFMT_S16_BE:
 279                 return "S16_BE";
 280         case AFMT_S8:
 281                 return "S8";
 282         case AFMT_U16_LE:
 283                 return "U16_LE";
 284         case AFMT_U16_BE:
 285                 return "U16_BE";
 286         case AFMT_MPEG:
 287                 return "MPEG";
 288         default:
 289                 return "unknown";
 290         }
 291 }
 292 #endif
 293
 294 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 295                                    struct snd_info_buffer *buffer)
 296 {
 297         struct snd_pcm_info *info;
 298         int err;
 299
 300         if (! substream)
 301                 return;
 302
 303         info = kmalloc(sizeof(*info), GFP_KERNEL);
 304         if (! info) {
 305                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 306                 return;
 307         }
 308
 309         err = snd_pcm_info(substream, info);
 310         if (err < 0) {
 311                 snd_iprintf(buffer, "error %d\n", err);
 312                 kfree(info);
 313                 return;
 314         }
 315         snd_iprintf(buffer, "card: %d\n", info->card);
 316         snd_iprintf(buffer, "device: %d\n", info->device);
 317         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 318         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 319         snd_iprintf(buffer, "id: %s\n", info->id);
 320         snd_iprintf(buffer, "name: %s\n", info->name);
 321         snd_iprintf(buffer, "subname: %s\n", info->subname);
 322         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 323         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 324         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 325         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 326         kfree(info);
 327 }
 328
 329 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 330                                           struct snd_info_buffer *buffer)
 331 {
 332         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 333                                buffer);
 334 }
 335
 336 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 337                                              struct snd_info_buffer *buffer)
 338 {
 339         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 340                                buffer);
 341 }
 342
 343 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 344                                                   struct snd_info_buffer *buffer)
 345 {
 346         struct snd_pcm_substream *substream = entry->private_data;
 347         struct snd_pcm_runtime *runtime = substream->runtime;
 348         if (!runtime) {
 349                 snd_iprintf(buffer, "closed\n");
 350                 return;
 351         }
 352         snd_pcm_stream_lock_irq(substream);
 353         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 354                 snd_iprintf(buffer, "no setup\n");
 355                 snd_pcm_stream_unlock_irq(substream);
 356                 return;
 357         }
 358         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 359         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 360         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 361         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 362         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 363         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 364         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 365         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 366 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 367         if (substream->oss.oss) {
 368                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 369                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 370                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 371                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 372                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 373                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 374         }
 375 #endif
 376         snd_pcm_stream_unlock_irq(substream);
 377 }
 378
 379 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 380                                                   struct snd_info_buffer *buffer)
 381 {
 382         struct snd_pcm_substream *substream = entry->private_data;
 383         struct snd_pcm_runtime *runtime = substream->runtime;
 384         if (!runtime) {
 385                 snd_iprintf(buffer, "closed\n");
 386                 return;
 387         }
 388         snd_pcm_stream_lock_irq(substream);
 389         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 390                 snd_iprintf(buffer, "no setup\n");
 391                 snd_pcm_stream_unlock_irq(substream);
 392                 return;
 393         }
 394         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 395         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 396         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 397         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 398         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 399         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 400         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 401         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 402         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 403         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 404         snd_pcm_stream_unlock_irq(substream);
 405 }
 406
 407 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 408                                                struct snd_info_buffer *buffer)
 409 {
 410         struct snd_pcm_substream *substream = entry->private_data;
 411         struct snd_pcm_runtime *runtime = substream->runtime;
 412         struct snd_pcm_status status;
 413         int err;
 414         if (!runtime) {
 415                 snd_iprintf(buffer, "closed\n");
 416                 return;
 417         }
 418         memset(&status, 0, sizeof(status));
 419         err = snd_pcm_status(substream, &status);
 420         if (err < 0) {
 421                 snd_iprintf(buffer, "error %d\n", err);
 422                 return;
 423         }
 424         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 425         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 426                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 427         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 428                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 429         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 430         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 431         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 432         snd_iprintf(buffer, "-----\n");
 433         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 434         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 435 }
 436
 437 #ifdef CONFIG_SND_DEBUG
 438 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 439                                     struct snd_info_buffer *buffer)
 440 {
 441         struct snd_pcm_str *pstr = entry->private_data;
 442         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 443 }
 444
 445 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 446                                      struct snd_info_buffer *buffer)
 447 {
 448         struct snd_pcm_str *pstr = entry->private_data;
 449         char line[64];
 450         if (!snd_info_get_line(buffer, line, sizeof(line)))
 451                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 452 }
 453 #endif
 454
 455 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 456 {
 457         struct snd_pcm *pcm = pstr->pcm;
 458         struct snd_info_entry *entry;
 459         char name[16];
 460
 461         sprintf(name, "pcm%i%c", pcm->device,
 462                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 463         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 464                 return -ENOMEM;
 465         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 466         if (snd_info_register(entry) < 0) {
 467                 snd_info_free_entry(entry);
 468                 return -ENOMEM;
 469         }
 470         pstr->proc_root = entry;
 471
 472         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 473                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
 474                 if (snd_info_register(entry) < 0) {
 475                         snd_info_free_entry(entry);
 476                         entry = NULL;
 477                 }
 478         }
 479         pstr->proc_info_entry = entry;
 480
 481 #ifdef CONFIG_SND_DEBUG
 482         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 483                                                 pstr->proc_root)) != NULL) {
 484                 entry->c.text.read_size = 64;
 485                 entry->c.text.read = snd_pcm_xrun_debug_read;
 486                 entry->c.text.write_size = 64;
 487                 entry->c.text.write = snd_pcm_xrun_debug_write;
 488                 entry->mode |= S_IWUSR;
 489                 entry->private_data = pstr;
 490                 if (snd_info_register(entry) < 0) {
 491                         snd_info_free_entry(entry);
 492                         entry = NULL;
 493                 }
 494         }
 495         pstr->proc_xrun_debug_entry = entry;
 496 #endif
 497         return 0;
 498 }
 499
 500 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 501 {
 502 #ifdef CONFIG_SND_DEBUG
 503         if (pstr->proc_xrun_debug_entry) {
 504                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 505                 pstr->proc_xrun_debug_entry = NULL;
 506         }
 507 #endif
 508         if (pstr->proc_info_entry) {
 509                 snd_info_unregister(pstr->proc_info_entry);
 510                 pstr->proc_info_entry = NULL;
 511         }
 512         if (pstr->proc_root) {
 513                 snd_info_unregister(pstr->proc_root);
 514                 pstr->proc_root = NULL;
 515         }
 516         return 0;
 517 }
 518
 519 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 520 {
 521         struct snd_info_entry *entry;
 522         struct snd_card *card;
 523         char name[16];
 524
 525         card = substream->pcm->card;
 526
 527         sprintf(name, "sub%i", substream->number);
 528         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 529                 return -ENOMEM;
 530         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 531         if (snd_info_register(entry) < 0) {
 532                 snd_info_free_entry(entry);
 533                 return -ENOMEM;
 534         }
 535         substream->proc_root = entry;
 536
 537         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 538                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
 539                 if (snd_info_register(entry) < 0) {
 540                         snd_info_free_entry(entry);
 541                         entry = NULL;
 542                 }
 543         }
 544         substream->proc_info_entry = entry;
 545
 546         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 547                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
 548                 if (snd_info_register(entry) < 0) {
 549                         snd_info_free_entry(entry);
 550                         entry = NULL;
 551                 }
 552         }
 553         substream->proc_hw_params_entry = entry;
 554
 555         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 556                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
 557                 if (snd_info_register(entry) < 0) {
 558                         snd_info_free_entry(entry);
 559                         entry = NULL;
 560                 }
 561         }
 562         substream->proc_sw_params_entry = entry;
 563
 564         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 565                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
 566                 if (snd_info_register(entry) < 0) {
 567                         snd_info_free_entry(entry);
 568                         entry = NULL;
 569                 }
 570         }
 571         substream->proc_status_entry = entry;
 572
 573         return 0;
 574 }
 575
 576 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 577 {
 578         if (substream->proc_info_entry) {
 579                 snd_info_unregister(substream->proc_info_entry);
 580                 substream->proc_info_entry = NULL;
 581         }
 582         if (substream->proc_hw_params_entry) {
 583                 snd_info_unregister(substream->proc_hw_params_entry);
 584                 substream->proc_hw_params_entry = NULL;
 585         }
 586         if (substream->proc_sw_params_entry) {
 587                 snd_info_unregister(substream->proc_sw_params_entry);
 588                 substream->proc_sw_params_entry = NULL;
 589         }
 590         if (substream->proc_status_entry) {
 591                 snd_info_unregister(substream->proc_status_entry);
 592                 substream->proc_status_entry = NULL;
 593         }
 594         if (substream->proc_root) {
 595                 snd_info_unregister(substream->proc_root);
 596                 substream->proc_root = NULL;
 597         }
 598         return 0;
 599 }
 600 #else /* !CONFIG_PROC_FS */
 601 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 602 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 603 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 604 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 605 #endif /* CONFIG_PROC_FS */
 606
 607 /**
 608  * snd_pcm_new_stream - create a new PCM stream
 609  * @pcm: the pcm instance
 610  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 611  * @substream_count: the number of substreams
 612  *
 613  * Creates a new stream for the pcm.
 614  * The corresponding stream on the pcm must have been empty before
 615  * calling this, i.e. zero must be given to the argument of
 616  * snd_pcm_new().
 617  *
 618  * Returns zero if successful, or a negative error code on failure.
 619  */
 620 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 621 {
 622         int idx, err;
 623         struct snd_pcm_str *pstr = &pcm->streams[stream];
 624         struct snd_pcm_substream *substream, *prev;
 625
 626 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 627         init_MUTEX(&pstr->oss.setup_mutex);
 628 #endif
 629         pstr->stream = stream;
 630         pstr->pcm = pcm;
 631         pstr->substream_count = substream_count;
 632         if (substream_count > 0) {
 633                 err = snd_pcm_stream_proc_init(pstr);
 634                 if (err < 0) {
 635                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 636                         return err;
 637                 }
 638         }
 639         prev = NULL;
 640         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 641                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 642                 if (substream == NULL) {
 643                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 644                         return -ENOMEM;
 645                 }
 646                 substream->pcm = pcm;
 647                 substream->pstr = pstr;
 648                 substream->number = idx;
 649                 substream->stream = stream;
 650                 sprintf(substream->name, "subdevice #%i", idx);
 651                 substream->buffer_bytes_max = UINT_MAX;
 652                 if (prev == NULL)
 653                         pstr->substream = substream;
 654                 else
 655                         prev->next = substream;
 656                 err = snd_pcm_substream_proc_init(substream);
 657                 if (err < 0) {
 658                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 659                         kfree(substream);
 660                         return err;
 661                 }
 662                 substream->group = &substream->self_group;
 663                 spin_lock_init(&substream->self_group.lock);
 664                 INIT_LIST_HEAD(&substream->self_group.substreams);
 665                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 666                 spin_lock_init(&substream->timer_lock);
 667                 prev = substream;
 668         }
 669         return 0;
 670 }
 671
 672 /**
 673  * snd_pcm_new - create a new PCM instance
 674  * @card: the card instance
 675  * @id: the id string
 676  * @device: the device index (zero based)
 677  * @playback_count: the number of substreams for playback
 678  * @capture_count: the number of substreams for capture
 679  * @rpcm: the pointer to store the new pcm instance
 680  *
 681  * Creates a new PCM instance.
 682  *
 683  * The pcm operators have to be set afterwards to the new instance
 684  * via snd_pcm_set_ops().
 685  *
 686  * Returns zero if successful, or a negative error code on failure.
 687  */
 688 int snd_pcm_new(struct snd_card *card, char *id, int device,
 689                 int playback_count, int capture_count,
 690                 struct snd_pcm ** rpcm)
 691 {
 692         struct snd_pcm *pcm;
 693         int err;
 694         static struct snd_device_ops ops = {
 695                 .dev_free = snd_pcm_dev_free,
 696                 .dev_register = snd_pcm_dev_register,
 697                 .dev_disconnect = snd_pcm_dev_disconnect,
 698                 .dev_unregister = snd_pcm_dev_unregister
 699         };
 700
 701         snd_assert(rpcm != NULL, return -EINVAL);
 702         *rpcm = NULL;
 703         snd_assert(card != NULL, return -ENXIO);
 704         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 705         if (pcm == NULL) {
 706                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 707                 return -ENOMEM;
 708         }
 709         pcm->card = card;
 710         pcm->device = device;
 711         if (id)
 712                 strlcpy(pcm->id, id, sizeof(pcm->id));
 713         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 714                 snd_pcm_free(pcm);
 715                 return err;
 716         }
 717         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 718                 snd_pcm_free(pcm);
 719                 return err;
 720         }
 721         init_MUTEX(&pcm->open_mutex);
 722         init_waitqueue_head(&pcm->open_wait);
 723         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 724                 snd_pcm_free(pcm);
 725                 return err;
 726         }
 727         *rpcm = pcm;
 728         return 0;
 729 }
 730
 731 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 732 {
 733         struct snd_pcm_substream *substream, *substream_next;
 734 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 735         struct snd_pcm_oss_setup *setup, *setupn;
 736 #endif
 737         substream = pstr->substream;
 738         while (substream) {
 739                 substream_next = substream->next;
 740                 snd_pcm_substream_proc_done(substream);
 741                 kfree(substream);
 742                 substream = substream_next;
 743         }
 744         snd_pcm_stream_proc_done(pstr);
 745 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 746         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 747                 setupn = setup->next;
 748                 kfree(setup->task_name);
 749                 kfree(setup);
 750         }
 751 #endif
 752 }
 753
 754 static int snd_pcm_free(struct snd_pcm *pcm)
 755 {
 756         snd_assert(pcm != NULL, return -ENXIO);
 757         if (pcm->private_free)
 758                 pcm->private_free(pcm);
 759         snd_pcm_lib_preallocate_free_for_all(pcm);
 760         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 761         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 762         kfree(pcm);
 763         return 0;
 764 }
 765
 766 static int snd_pcm_dev_free(struct snd_device *device)
 767 {
 768         struct snd_pcm *pcm = device->device_data;
 769         return snd_pcm_free(pcm);
 770 }
 771
 772 static void snd_pcm_tick_timer_func(unsigned long data)
 773 {
 774         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
 775         snd_pcm_tick_elapsed(substream);
 776 }
 777
 778 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
 779                            struct snd_pcm_substream **rsubstream)
 780 {
 781         struct snd_pcm_str * pstr;
 782         struct snd_pcm_substream *substream;
 783         struct snd_pcm_runtime *runtime;
 784         struct snd_ctl_file *kctl;
 785         struct snd_card *card;
 786         struct list_head *list;
 787         int prefer_subdevice = -1;
 788         size_t size;
 789
 790         snd_assert(rsubstream != NULL, return -EINVAL);
 791         *rsubstream = NULL;
 792         snd_assert(pcm != NULL, return -ENXIO);
 793         pstr = &pcm->streams[stream];
 794         if (pstr->substream == NULL)
 795                 return -ENODEV;
 796
 797         card = pcm->card;
 798         down_read(&card->controls_rwsem);
 799         list_for_each(list, &card->ctl_files) {
 800                 kctl = snd_ctl_file(list);
 801                 if (kctl->pid == current->pid) {
 802                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 803                         break;
 804                 }
 805         }
 806         up_read(&card->controls_rwsem);
 807
 808         if (pstr->substream_count == 0)
 809                 return -ENODEV;
 810         switch (stream) {
 811         case SNDRV_PCM_STREAM_PLAYBACK:
 812                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 813                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 814                                 if (SUBSTREAM_BUSY(substream))
 815                                         return -EAGAIN;
 816                         }
 817                 }
 818                 break;
 819         case SNDRV_PCM_STREAM_CAPTURE:
 820                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 821                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 822                                 if (SUBSTREAM_BUSY(substream))
 823                                         return -EAGAIN;
 824                         }
 825                 }
 826                 break;
 827         default:
 828                 return -EINVAL;
 829         }
 830
 831         if (prefer_subdevice >= 0) {
 832                 for (substream = pstr->substream; substream; substream = substream->next)
 833                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 834                                 goto __ok;
 835         }
 836         for (substream = pstr->substream; substream; substream = substream->next)
 837                 if (!SUBSTREAM_BUSY(substream))
 838                         break;
 839       __ok:
 840         if (substream == NULL)
 841                 return -EAGAIN;
 842
 843         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 844         if (runtime == NULL)
 845                 return -ENOMEM;
 846
 847         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 848         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 849         if (runtime->status == NULL) {
 850                 kfree(runtime);
 851                 return -ENOMEM;
 852         }
 853         memset((void*)runtime->status, 0, size);
 854
 855         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 856         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 857         if (runtime->control == NULL) {
 858                 snd_free_pages((void*)runtime->status,
 859                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 860                 kfree(runtime);
 861                 return -ENOMEM;
 862         }
 863         memset((void*)runtime->control, 0, size);
 864
 865         init_waitqueue_head(&runtime->sleep);
 866         atomic_set(&runtime->mmap_count, 0);
 867         init_timer(&runtime->tick_timer);
 868         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 869         runtime->tick_timer.data = (unsigned long) substream;
 870
 871         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 872
 873         substream->runtime = runtime;
 874         substream->private_data = pcm->private_data;
 875         pstr->substream_opened++;
 876         *rsubstream = substream;
 877         return 0;
 878 }
 879
 880 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
 881 {
 882         struct snd_pcm_runtime *runtime;
 883         substream->file = NULL;
 884         runtime = substream->runtime;
 885         snd_assert(runtime != NULL, return);
 886         if (runtime->private_free != NULL)
 887                 runtime->private_free(runtime);
 888         snd_free_pages((void*)runtime->status,
 889                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 890         snd_free_pages((void*)runtime->control,
 891                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 892         kfree(runtime->hw_constraints.rules);
 893         kfree(runtime);
 894         substream->runtime = NULL;
 895         substream->pstr->substream_opened--;
 896 }
 897
 898 static int snd_pcm_dev_register(struct snd_device *device)
 899 {
 900         int cidx, err;
 901         struct snd_pcm_substream *substream;
 902         struct list_head *list;
 903         char str[16];
 904         struct snd_pcm *pcm = device->device_data;
 905
 906         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 907         down(&register_mutex);
 908         if (snd_pcm_search(pcm->card, pcm->device)) {
 909                 up(&register_mutex);
 910                 return -EBUSY;
 911         }
 912         list_add_tail(&pcm->list, &snd_pcm_devices);
 913         for (cidx = 0; cidx < 2; cidx++) {
 914                 int devtype = -1;
 915                 if (pcm->streams[cidx].substream == NULL)
 916                         continue;
 917                 switch (cidx) {
 918                 case SNDRV_PCM_STREAM_PLAYBACK:
 919                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 920                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 921                         break;
 922                 case SNDRV_PCM_STREAM_CAPTURE:
 923                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 924                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 925                         break;
 926                 }
 927                 if ((err = snd_register_device(devtype, pcm->card,
 928                                                pcm->device,
 929                                                &snd_pcm_f_ops[cidx],
 930                                                pcm, str)) < 0)
 931                 {
 932                         list_del(&pcm->list);
 933                         up(&register_mutex);
 934                         return err;
 935                 }
 936                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 937                         snd_pcm_timer_init(substream);
 938         }
 939         list_for_each(list, &snd_pcm_notify_list) {
 940                 struct snd_pcm_notify *notify;
 941                 notify = list_entry(list, struct snd_pcm_notify, list);
 942                 notify->n_register(pcm);
 943         }
 944         up(&register_mutex);
 945         return 0;
 946 }
 947
 948 static int snd_pcm_dev_disconnect(struct snd_device *device)
 949 {
 950         struct snd_pcm *pcm = device->device_data;
 951         struct list_head *list;
 952         struct snd_pcm_substream *substream;
 953         int cidx;
 954
 955         down(&register_mutex);
 956         list_del_init(&pcm->list);
 957         for (cidx = 0; cidx < 2; cidx++)
 958                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 959                         if (substream->runtime)
 960                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 961         list_for_each(list, &snd_pcm_notify_list) {
 962                 struct snd_pcm_notify *notify;
 963                 notify = list_entry(list, struct snd_pcm_notify, list);
 964                 notify->n_disconnect(pcm);
 965         }
 966         up(&register_mutex);
 967         return 0;
 968 }
 969
 970 static int snd_pcm_dev_unregister(struct snd_device *device)
 971 {
 972         int cidx, devtype;
 973         struct snd_pcm_substream *substream;
 974         struct list_head *list;
 975         struct snd_pcm *pcm = device->device_data;
 976
 977         snd_assert(pcm != NULL, return -ENXIO);
 978         down(&register_mutex);
 979         list_del(&pcm->list);
 980         for (cidx = 0; cidx < 2; cidx++) {
 981                 devtype = -1;
 982                 switch (cidx) {
 983                 case SNDRV_PCM_STREAM_PLAYBACK:
 984                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 985                         break;
 986                 case SNDRV_PCM_STREAM_CAPTURE:
 987                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 988                         break;
 989                 }
 990                 snd_unregister_device(devtype, pcm->card, pcm->device);
 991                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 992                         snd_pcm_timer_done(substream);
 993         }
 994         list_for_each(list, &snd_pcm_notify_list) {
 995                 struct snd_pcm_notify *notify;
 996                 notify = list_entry(list, struct snd_pcm_notify, list);
 997                 notify->n_unregister(pcm);
 998         }
 999         up(&register_mutex);
1000         return snd_pcm_free(pcm);
1001 }
1002
1003 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1004 {
1005         struct list_head *p;
1006
1007         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1008         down(&register_mutex);
1009         if (nfree) {
1010                 list_del(&notify->list);
1011                 list_for_each(p, &snd_pcm_devices)
1012                         notify->n_unregister(list_entry(p,
1013                                                         struct snd_pcm, list));
1014         } else {
1015                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1016                 list_for_each(p, &snd_pcm_devices)
1017                         notify->n_register(list_entry(p, struct snd_pcm, list));
1018         }
1019         up(&register_mutex);
1020         return 0;
1021 }
1022
1023 #ifdef CONFIG_PROC_FS
1024 /*
1025  *  Info interface
1026  */
1027
1028 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1029                               struct snd_info_buffer *buffer)
1030 {
1031         struct list_head *p;
1032         struct snd_pcm *pcm;
1033
1034         down(&register_mutex);
1035         list_for_each(p, &snd_pcm_devices) {
1036                 pcm = list_entry(p, struct snd_pcm, list);
1037                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1038                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1039                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1040                         snd_iprintf(buffer, " : playback %i",
1041                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1042                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1043                         snd_iprintf(buffer, " : capture %i",
1044                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1045                 snd_iprintf(buffer, "\n");
1046         }
1047         up(&register_mutex);
1048 }
1049
1050 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1051
1052 static void snd_pcm_proc_init(void)
1053 {
1054         struct snd_info_entry *entry;
1055
1056         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1057                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128,
1058                                       snd_pcm_proc_read);
1059                 if (snd_info_register(entry) < 0) {
1060                         snd_info_free_entry(entry);
1061                         entry = NULL;
1062                 }
1063         }
1064         snd_pcm_proc_entry = entry;
1065 }
1066
1067 static void snd_pcm_proc_done(void)
1068 {
1069         if (snd_pcm_proc_entry)
1070                 snd_info_unregister(snd_pcm_proc_entry);
1071 }
1072
1073 #else /* !CONFIG_PROC_FS */
1074 #define snd_pcm_proc_init()
1075 #define snd_pcm_proc_done()
1076 #endif /* CONFIG_PROC_FS */
1077
1078
1079 /*
1080  *  ENTRY functions
1081  */
1082
1083 static int __init alsa_pcm_init(void)
1084 {
1085         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1086         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1087         snd_pcm_proc_init();
1088         return 0;
1089 }
1090
1091 static void __exit alsa_pcm_exit(void)
1092 {
1093         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1094         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1095         snd_pcm_proc_done();
1096 }
1097
1098 module_init(alsa_pcm_init)
1099 module_exit(alsa_pcm_exit)
1100
1101 EXPORT_SYMBOL(snd_pcm_new);
1102 EXPORT_SYMBOL(snd_pcm_new_stream);
1103 EXPORT_SYMBOL(snd_pcm_notify);
1104 EXPORT_SYMBOL(snd_pcm_open_substream);
1105 EXPORT_SYMBOL(snd_pcm_release_substream);
1106 EXPORT_SYMBOL(snd_pcm_format_name);
1107   /* pcm_native.c */
1108 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1109 #ifdef CONFIG_PM
1110 EXPORT_SYMBOL(snd_pcm_suspend);
1111 EXPORT_SYMBOL(snd_pcm_suspend_all);
1112 #endif
1113 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1114 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1115 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1116 EXPORT_SYMBOL(snd_pcm_mmap_data);
1117 #if SNDRV_PCM_INFO_MMAP_IOMEM
1118 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1119 #endif
1120  /* pcm_misc.c */
1121 EXPORT_SYMBOL(snd_pcm_format_signed);
1122 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1123 EXPORT_SYMBOL(snd_pcm_format_linear);
1124 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1125 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1126 EXPORT_SYMBOL(snd_pcm_format_width);
1127 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1128 EXPORT_SYMBOL(snd_pcm_format_size);
1129 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1130 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1131 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1132 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);