git.oblomov.eu Git - linux-2.6/blob - 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 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 144 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 145 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 146 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 147 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 148 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 149 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 150 #define START(v) [SNDRV_PCM_START_##v] = #v
 151 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 152 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 153
 154 static char *snd_pcm_format_names[] = {
 155         FORMAT(S8),
 156         FORMAT(U8),
 157         FORMAT(S16_LE),
 158         FORMAT(S16_BE),
 159         FORMAT(U16_LE),
 160         FORMAT(U16_BE),
 161         FORMAT(S24_LE),
 162         FORMAT(S24_BE),
 163         FORMAT(U24_LE),
 164         FORMAT(U24_BE),
 165         FORMAT(S32_LE),
 166         FORMAT(S32_BE),
 167         FORMAT(U32_LE),
 168         FORMAT(U32_BE),
 169         FORMAT(FLOAT_LE),
 170         FORMAT(FLOAT_BE),
 171         FORMAT(FLOAT64_LE),
 172         FORMAT(FLOAT64_BE),
 173         FORMAT(IEC958_SUBFRAME_LE),
 174         FORMAT(IEC958_SUBFRAME_BE),
 175         FORMAT(MU_LAW),
 176         FORMAT(A_LAW),
 177         FORMAT(IMA_ADPCM),
 178         FORMAT(MPEG),
 179         FORMAT(GSM),
 180         FORMAT(SPECIAL),
 181         FORMAT(S24_3LE),
 182         FORMAT(S24_3BE),
 183         FORMAT(U24_3LE),
 184         FORMAT(U24_3BE),
 185         FORMAT(S20_3LE),
 186         FORMAT(S20_3BE),
 187         FORMAT(U20_3LE),
 188         FORMAT(U20_3BE),
 189         FORMAT(S18_3LE),
 190         FORMAT(S18_3BE),
 191         FORMAT(U18_3LE),
 192         FORMAT(U18_3BE),
 193 };
 194
 195 const char *snd_pcm_format_name(snd_pcm_format_t format)
 196 {
 197         return snd_pcm_format_names[format];
 198 }
 199
 200 #ifdef CONFIG_PROC_FS
 201 static char *snd_pcm_stream_names[] = {
 202         STREAM(PLAYBACK),
 203         STREAM(CAPTURE),
 204 };
 205
 206 static char *snd_pcm_state_names[] = {
 207         STATE(OPEN),
 208         STATE(SETUP),
 209         STATE(PREPARED),
 210         STATE(RUNNING),
 211         STATE(XRUN),
 212         STATE(DRAINING),
 213         STATE(PAUSED),
 214         STATE(SUSPENDED),
 215 };
 216
 217 static char *snd_pcm_access_names[] = {
 218         ACCESS(MMAP_INTERLEAVED),
 219         ACCESS(MMAP_NONINTERLEAVED),
 220         ACCESS(MMAP_COMPLEX),
 221         ACCESS(RW_INTERLEAVED),
 222         ACCESS(RW_NONINTERLEAVED),
 223 };
 224
 225 static char *snd_pcm_subformat_names[] = {
 226         SUBFORMAT(STD),
 227 };
 228
 229 static char *snd_pcm_tstamp_mode_names[] = {
 230         TSTAMP(NONE),
 231         TSTAMP(MMAP),
 232 };
 233
 234 static const char *snd_pcm_stream_name(int stream)
 235 {
 236         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 237         return snd_pcm_stream_names[stream];
 238 }
 239
 240 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 241 {
 242         return snd_pcm_access_names[access];
 243 }
 244
 245 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 246 {
 247         return snd_pcm_subformat_names[subformat];
 248 }
 249
 250 static const char *snd_pcm_tstamp_mode_name(int mode)
 251 {
 252         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 253         return snd_pcm_tstamp_mode_names[mode];
 254 }
 255
 256 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 257 {
 258         return snd_pcm_state_names[state];
 259 }
 260
 261 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 262 #include <linux/soundcard.h>
 263 static const char *snd_pcm_oss_format_name(int format)
 264 {
 265         switch (format) {
 266         case AFMT_MU_LAW:
 267                 return "MU_LAW";
 268         case AFMT_A_LAW:
 269                 return "A_LAW";
 270         case AFMT_IMA_ADPCM:
 271                 return "IMA_ADPCM";
 272         case AFMT_U8:
 273                 return "U8";
 274         case AFMT_S16_LE:
 275                 return "S16_LE";
 276         case AFMT_S16_BE:
 277                 return "S16_BE";
 278         case AFMT_S8:
 279                 return "S8";
 280         case AFMT_U16_LE:
 281                 return "U16_LE";
 282         case AFMT_U16_BE:
 283                 return "U16_BE";
 284         case AFMT_MPEG:
 285                 return "MPEG";
 286         default:
 287                 return "unknown";
 288         }
 289 }
 290 #endif
 291
 292 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 293                                    struct snd_info_buffer *buffer)
 294 {
 295         struct snd_pcm_info *info;
 296         int err;
 297
 298         if (! substream)
 299                 return;
 300
 301         info = kmalloc(sizeof(*info), GFP_KERNEL);
 302         if (! info) {
 303                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 304                 return;
 305         }
 306
 307         err = snd_pcm_info(substream, info);
 308         if (err < 0) {
 309                 snd_iprintf(buffer, "error %d\n", err);
 310                 kfree(info);
 311                 return;
 312         }
 313         snd_iprintf(buffer, "card: %d\n", info->card);
 314         snd_iprintf(buffer, "device: %d\n", info->device);
 315         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 316         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 317         snd_iprintf(buffer, "id: %s\n", info->id);
 318         snd_iprintf(buffer, "name: %s\n", info->name);
 319         snd_iprintf(buffer, "subname: %s\n", info->subname);
 320         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 321         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 322         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 323         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 324         kfree(info);
 325 }
 326
 327 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 328                                           struct snd_info_buffer *buffer)
 329 {
 330         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 331                                buffer);
 332 }
 333
 334 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 335                                              struct snd_info_buffer *buffer)
 336 {
 337         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 338                                buffer);
 339 }
 340
 341 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 342                                                   struct snd_info_buffer *buffer)
 343 {
 344         struct snd_pcm_substream *substream = entry->private_data;
 345         struct snd_pcm_runtime *runtime = substream->runtime;
 346         if (!runtime) {
 347                 snd_iprintf(buffer, "closed\n");
 348                 return;
 349         }
 350         snd_pcm_stream_lock_irq(substream);
 351         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 352                 snd_iprintf(buffer, "no setup\n");
 353                 snd_pcm_stream_unlock_irq(substream);
 354                 return;
 355         }
 356         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 357         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 358         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 359         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 360         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 361         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 362         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 363         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 364 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 365         if (substream->oss.oss) {
 366                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 367                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 368                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 369                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 370                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 371                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 372         }
 373 #endif
 374         snd_pcm_stream_unlock_irq(substream);
 375 }
 376
 377 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 378                                                   struct snd_info_buffer *buffer)
 379 {
 380         struct snd_pcm_substream *substream = entry->private_data;
 381         struct snd_pcm_runtime *runtime = substream->runtime;
 382         if (!runtime) {
 383                 snd_iprintf(buffer, "closed\n");
 384                 return;
 385         }
 386         snd_pcm_stream_lock_irq(substream);
 387         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 388                 snd_iprintf(buffer, "no setup\n");
 389                 snd_pcm_stream_unlock_irq(substream);
 390                 return;
 391         }
 392         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 393         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 394         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 395         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 396         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 397         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 398         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 399         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 400         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 401         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 402         snd_pcm_stream_unlock_irq(substream);
 403 }
 404
 405 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 406                                                struct snd_info_buffer *buffer)
 407 {
 408         struct snd_pcm_substream *substream = entry->private_data;
 409         struct snd_pcm_runtime *runtime = substream->runtime;
 410         struct snd_pcm_status status;
 411         int err;
 412         if (!runtime) {
 413                 snd_iprintf(buffer, "closed\n");
 414                 return;
 415         }
 416         memset(&status, 0, sizeof(status));
 417         err = snd_pcm_status(substream, &status);
 418         if (err < 0) {
 419                 snd_iprintf(buffer, "error %d\n", err);
 420                 return;
 421         }
 422         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 423         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 424                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 425         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 426                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 427         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 428         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 429         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 430         snd_iprintf(buffer, "-----\n");
 431         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 432         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 433 }
 434
 435 #ifdef CONFIG_SND_DEBUG
 436 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 437                                     struct snd_info_buffer *buffer)
 438 {
 439         struct snd_pcm_str *pstr = entry->private_data;
 440         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 441 }
 442
 443 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 444                                      struct snd_info_buffer *buffer)
 445 {
 446         struct snd_pcm_str *pstr = entry->private_data;
 447         char line[64];
 448         if (!snd_info_get_line(buffer, line, sizeof(line)))
 449                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 450 }
 451 #endif
 452
 453 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 454 {
 455         struct snd_pcm *pcm = pstr->pcm;
 456         struct snd_info_entry *entry;
 457         char name[16];
 458
 459         sprintf(name, "pcm%i%c", pcm->device,
 460                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 461         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 462                 return -ENOMEM;
 463         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 464         if (snd_info_register(entry) < 0) {
 465                 snd_info_free_entry(entry);
 466                 return -ENOMEM;
 467         }
 468         pstr->proc_root = entry;
 469
 470         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 471                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
 472                 if (snd_info_register(entry) < 0) {
 473                         snd_info_free_entry(entry);
 474                         entry = NULL;
 475                 }
 476         }
 477         pstr->proc_info_entry = entry;
 478
 479 #ifdef CONFIG_SND_DEBUG
 480         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 481                                                 pstr->proc_root)) != NULL) {
 482                 entry->c.text.read_size = 64;
 483                 entry->c.text.read = snd_pcm_xrun_debug_read;
 484                 entry->c.text.write_size = 64;
 485                 entry->c.text.write = snd_pcm_xrun_debug_write;
 486                 entry->mode |= S_IWUSR;
 487                 entry->private_data = pstr;
 488                 if (snd_info_register(entry) < 0) {
 489                         snd_info_free_entry(entry);
 490                         entry = NULL;
 491                 }
 492         }
 493         pstr->proc_xrun_debug_entry = entry;
 494 #endif
 495         return 0;
 496 }
 497
 498 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 499 {
 500 #ifdef CONFIG_SND_DEBUG
 501         if (pstr->proc_xrun_debug_entry) {
 502                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 503                 pstr->proc_xrun_debug_entry = NULL;
 504         }
 505 #endif
 506         if (pstr->proc_info_entry) {
 507                 snd_info_unregister(pstr->proc_info_entry);
 508                 pstr->proc_info_entry = NULL;
 509         }
 510         if (pstr->proc_root) {
 511                 snd_info_unregister(pstr->proc_root);
 512                 pstr->proc_root = NULL;
 513         }
 514         return 0;
 515 }
 516
 517 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 518 {
 519         struct snd_info_entry *entry;
 520         struct snd_card *card;
 521         char name[16];
 522
 523         card = substream->pcm->card;
 524
 525         sprintf(name, "sub%i", substream->number);
 526         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 527                 return -ENOMEM;
 528         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 529         if (snd_info_register(entry) < 0) {
 530                 snd_info_free_entry(entry);
 531                 return -ENOMEM;
 532         }
 533         substream->proc_root = entry;
 534
 535         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 536                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
 537                 if (snd_info_register(entry) < 0) {
 538                         snd_info_free_entry(entry);
 539                         entry = NULL;
 540                 }
 541         }
 542         substream->proc_info_entry = entry;
 543
 544         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 545                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
 546                 if (snd_info_register(entry) < 0) {
 547                         snd_info_free_entry(entry);
 548                         entry = NULL;
 549                 }
 550         }
 551         substream->proc_hw_params_entry = entry;
 552
 553         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 554                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
 555                 if (snd_info_register(entry) < 0) {
 556                         snd_info_free_entry(entry);
 557                         entry = NULL;
 558                 }
 559         }
 560         substream->proc_sw_params_entry = entry;
 561
 562         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 563                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
 564                 if (snd_info_register(entry) < 0) {
 565                         snd_info_free_entry(entry);
 566                         entry = NULL;
 567                 }
 568         }
 569         substream->proc_status_entry = entry;
 570
 571         return 0;
 572 }
 573
 574 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 575 {
 576         if (substream->proc_info_entry) {
 577                 snd_info_unregister(substream->proc_info_entry);
 578                 substream->proc_info_entry = NULL;
 579         }
 580         if (substream->proc_hw_params_entry) {
 581                 snd_info_unregister(substream->proc_hw_params_entry);
 582                 substream->proc_hw_params_entry = NULL;
 583         }
 584         if (substream->proc_sw_params_entry) {
 585                 snd_info_unregister(substream->proc_sw_params_entry);
 586                 substream->proc_sw_params_entry = NULL;
 587         }
 588         if (substream->proc_status_entry) {
 589                 snd_info_unregister(substream->proc_status_entry);
 590                 substream->proc_status_entry = NULL;
 591         }
 592         if (substream->proc_root) {
 593                 snd_info_unregister(substream->proc_root);
 594                 substream->proc_root = NULL;
 595         }
 596         return 0;
 597 }
 598 #else /* !CONFIG_PROC_FS */
 599 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 600 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 601 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 602 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 603 #endif /* CONFIG_PROC_FS */
 604
 605 /**
 606  * snd_pcm_new_stream - create a new PCM stream
 607  * @pcm: the pcm instance
 608  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 609  * @substream_count: the number of substreams
 610  *
 611  * Creates a new stream for the pcm.
 612  * The corresponding stream on the pcm must have been empty before
 613  * calling this, i.e. zero must be given to the argument of
 614  * snd_pcm_new().
 615  *
 616  * Returns zero if successful, or a negative error code on failure.
 617  */
 618 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 619 {
 620         int idx, err;
 621         struct snd_pcm_str *pstr = &pcm->streams[stream];
 622         struct snd_pcm_substream *substream, *prev;
 623
 624 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 625         init_MUTEX(&pstr->oss.setup_mutex);
 626 #endif
 627         pstr->stream = stream;
 628         pstr->pcm = pcm;
 629         pstr->substream_count = substream_count;
 630         if (substream_count > 0) {
 631                 err = snd_pcm_stream_proc_init(pstr);
 632                 if (err < 0) {
 633                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 634                         return err;
 635                 }
 636         }
 637         prev = NULL;
 638         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 639                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 640                 if (substream == NULL) {
 641                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 642                         return -ENOMEM;
 643                 }
 644                 substream->pcm = pcm;
 645                 substream->pstr = pstr;
 646                 substream->number = idx;
 647                 substream->stream = stream;
 648                 sprintf(substream->name, "subdevice #%i", idx);
 649                 substream->buffer_bytes_max = UINT_MAX;
 650                 if (prev == NULL)
 651                         pstr->substream = substream;
 652                 else
 653                         prev->next = substream;
 654                 err = snd_pcm_substream_proc_init(substream);
 655                 if (err < 0) {
 656                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 657                         kfree(substream);
 658                         return err;
 659                 }
 660                 substream->group = &substream->self_group;
 661                 spin_lock_init(&substream->self_group.lock);
 662                 INIT_LIST_HEAD(&substream->self_group.substreams);
 663                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 664                 spin_lock_init(&substream->timer_lock);
 665                 prev = substream;
 666         }
 667         return 0;
 668 }
 669
 670 /**
 671  * snd_pcm_new - create a new PCM instance
 672  * @card: the card instance
 673  * @id: the id string
 674  * @device: the device index (zero based)
 675  * @playback_count: the number of substreams for playback
 676  * @capture_count: the number of substreams for capture
 677  * @rpcm: the pointer to store the new pcm instance
 678  *
 679  * Creates a new PCM instance.
 680  *
 681  * The pcm operators have to be set afterwards to the new instance
 682  * via snd_pcm_set_ops().
 683  *
 684  * Returns zero if successful, or a negative error code on failure.
 685  */
 686 int snd_pcm_new(struct snd_card *card, char *id, int device,
 687                 int playback_count, int capture_count,
 688                 struct snd_pcm ** rpcm)
 689 {
 690         struct snd_pcm *pcm;
 691         int err;
 692         static struct snd_device_ops ops = {
 693                 .dev_free = snd_pcm_dev_free,
 694                 .dev_register = snd_pcm_dev_register,
 695                 .dev_disconnect = snd_pcm_dev_disconnect,
 696                 .dev_unregister = snd_pcm_dev_unregister
 697         };
 698
 699         snd_assert(rpcm != NULL, return -EINVAL);
 700         *rpcm = NULL;
 701         snd_assert(card != NULL, return -ENXIO);
 702         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 703         if (pcm == NULL) {
 704                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 705                 return -ENOMEM;
 706         }
 707         pcm->card = card;
 708         pcm->device = device;
 709         if (id)
 710                 strlcpy(pcm->id, id, sizeof(pcm->id));
 711         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 712                 snd_pcm_free(pcm);
 713                 return err;
 714         }
 715         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 716                 snd_pcm_free(pcm);
 717                 return err;
 718         }
 719         init_MUTEX(&pcm->open_mutex);
 720         init_waitqueue_head(&pcm->open_wait);
 721         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 722                 snd_pcm_free(pcm);
 723                 return err;
 724         }
 725         *rpcm = pcm;
 726         return 0;
 727 }
 728
 729 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 730 {
 731         struct snd_pcm_substream *substream, *substream_next;
 732 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 733         struct snd_pcm_oss_setup *setup, *setupn;
 734 #endif
 735         substream = pstr->substream;
 736         while (substream) {
 737                 substream_next = substream->next;
 738                 snd_pcm_substream_proc_done(substream);
 739                 kfree(substream);
 740                 substream = substream_next;
 741         }
 742         snd_pcm_stream_proc_done(pstr);
 743 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 744         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 745                 setupn = setup->next;
 746                 kfree(setup->task_name);
 747                 kfree(setup);
 748         }
 749 #endif
 750 }
 751
 752 static int snd_pcm_free(struct snd_pcm *pcm)
 753 {
 754         snd_assert(pcm != NULL, return -ENXIO);
 755         if (pcm->private_free)
 756                 pcm->private_free(pcm);
 757         snd_pcm_lib_preallocate_free_for_all(pcm);
 758         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 759         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 760         kfree(pcm);
 761         return 0;
 762 }
 763
 764 static int snd_pcm_dev_free(struct snd_device *device)
 765 {
 766         struct snd_pcm *pcm = device->device_data;
 767         return snd_pcm_free(pcm);
 768 }
 769
 770 static void snd_pcm_tick_timer_func(unsigned long data)
 771 {
 772         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
 773         snd_pcm_tick_elapsed(substream);
 774 }
 775
 776 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
 777                            struct snd_pcm_substream **rsubstream)
 778 {
 779         struct snd_pcm_str * pstr;
 780         struct snd_pcm_substream *substream;
 781         struct snd_pcm_runtime *runtime;
 782         struct snd_ctl_file *kctl;
 783         struct snd_card *card;
 784         struct list_head *list;
 785         int prefer_subdevice = -1;
 786         size_t size;
 787
 788         snd_assert(rsubstream != NULL, return -EINVAL);
 789         *rsubstream = NULL;
 790         snd_assert(pcm != NULL, return -ENXIO);
 791         pstr = &pcm->streams[stream];
 792         if (pstr->substream == NULL)
 793                 return -ENODEV;
 794
 795         card = pcm->card;
 796         down_read(&card->controls_rwsem);
 797         list_for_each(list, &card->ctl_files) {
 798                 kctl = snd_ctl_file(list);
 799                 if (kctl->pid == current->pid) {
 800                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 801                         break;
 802                 }
 803         }
 804         up_read(&card->controls_rwsem);
 805
 806         if (pstr->substream_count == 0)
 807                 return -ENODEV;
 808         switch (stream) {
 809         case SNDRV_PCM_STREAM_PLAYBACK:
 810                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 811                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 812                                 if (SUBSTREAM_BUSY(substream))
 813                                         return -EAGAIN;
 814                         }
 815                 }
 816                 break;
 817         case SNDRV_PCM_STREAM_CAPTURE:
 818                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 819                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 820                                 if (SUBSTREAM_BUSY(substream))
 821                                         return -EAGAIN;
 822                         }
 823                 }
 824                 break;
 825         default:
 826                 return -EINVAL;
 827         }
 828
 829         if (prefer_subdevice >= 0) {
 830                 for (substream = pstr->substream; substream; substream = substream->next)
 831                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 832                                 goto __ok;
 833         }
 834         for (substream = pstr->substream; substream; substream = substream->next)
 835                 if (!SUBSTREAM_BUSY(substream))
 836                         break;
 837       __ok:
 838         if (substream == NULL)
 839                 return -EAGAIN;
 840
 841         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 842         if (runtime == NULL)
 843                 return -ENOMEM;
 844
 845         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 846         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 847         if (runtime->status == NULL) {
 848                 kfree(runtime);
 849                 return -ENOMEM;
 850         }
 851         memset((void*)runtime->status, 0, size);
 852
 853         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 854         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 855         if (runtime->control == NULL) {
 856                 snd_free_pages((void*)runtime->status,
 857                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 858                 kfree(runtime);
 859                 return -ENOMEM;
 860         }
 861         memset((void*)runtime->control, 0, size);
 862
 863         init_waitqueue_head(&runtime->sleep);
 864         atomic_set(&runtime->mmap_count, 0);
 865         init_timer(&runtime->tick_timer);
 866         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 867         runtime->tick_timer.data = (unsigned long) substream;
 868
 869         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 870
 871         substream->runtime = runtime;
 872         substream->private_data = pcm->private_data;
 873         pstr->substream_opened++;
 874         *rsubstream = substream;
 875         return 0;
 876 }
 877
 878 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
 879 {
 880         struct snd_pcm_runtime *runtime;
 881         substream->file = NULL;
 882         runtime = substream->runtime;
 883         snd_assert(runtime != NULL, return);
 884         if (runtime->private_free != NULL)
 885                 runtime->private_free(runtime);
 886         snd_free_pages((void*)runtime->status,
 887                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 888         snd_free_pages((void*)runtime->control,
 889                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 890         kfree(runtime->hw_constraints.rules);
 891         kfree(runtime);
 892         substream->runtime = NULL;
 893         substream->pstr->substream_opened--;
 894 }
 895
 896 static int snd_pcm_dev_register(struct snd_device *device)
 897 {
 898         int cidx, err;
 899         struct snd_pcm_substream *substream;
 900         struct list_head *list;
 901         char str[16];
 902         struct snd_pcm *pcm = device->device_data;
 903
 904         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 905         down(&register_mutex);
 906         if (snd_pcm_search(pcm->card, pcm->device)) {
 907                 up(&register_mutex);
 908                 return -EBUSY;
 909         }
 910         list_add_tail(&pcm->list, &snd_pcm_devices);
 911         for (cidx = 0; cidx < 2; cidx++) {
 912                 int devtype = -1;
 913                 if (pcm->streams[cidx].substream == NULL)
 914                         continue;
 915                 switch (cidx) {
 916                 case SNDRV_PCM_STREAM_PLAYBACK:
 917                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 918                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 919                         break;
 920                 case SNDRV_PCM_STREAM_CAPTURE:
 921                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 922                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 923                         break;
 924                 }
 925                 if ((err = snd_register_device(devtype, pcm->card,
 926                                                pcm->device,
 927                                                &snd_pcm_f_ops[cidx],
 928                                                pcm, str)) < 0)
 929                 {
 930                         list_del(&pcm->list);
 931                         up(&register_mutex);
 932                         return err;
 933                 }
 934                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 935                         snd_pcm_timer_init(substream);
 936         }
 937         list_for_each(list, &snd_pcm_notify_list) {
 938                 struct snd_pcm_notify *notify;
 939                 notify = list_entry(list, struct snd_pcm_notify, list);
 940                 notify->n_register(pcm);
 941         }
 942         up(&register_mutex);
 943         return 0;
 944 }
 945
 946 static int snd_pcm_dev_disconnect(struct snd_device *device)
 947 {
 948         struct snd_pcm *pcm = device->device_data;
 949         struct list_head *list;
 950         struct snd_pcm_substream *substream;
 951         int cidx;
 952
 953         down(&register_mutex);
 954         list_del_init(&pcm->list);
 955         for (cidx = 0; cidx < 2; cidx++)
 956                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 957                         if (substream->runtime)
 958                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 959         list_for_each(list, &snd_pcm_notify_list) {
 960                 struct snd_pcm_notify *notify;
 961                 notify = list_entry(list, struct snd_pcm_notify, list);
 962                 notify->n_disconnect(pcm);
 963         }
 964         up(&register_mutex);
 965         return 0;
 966 }
 967
 968 static int snd_pcm_dev_unregister(struct snd_device *device)
 969 {
 970         int cidx, devtype;
 971         struct snd_pcm_substream *substream;
 972         struct list_head *list;
 973         struct snd_pcm *pcm = device->device_data;
 974
 975         snd_assert(pcm != NULL, return -ENXIO);
 976         down(&register_mutex);
 977         list_del(&pcm->list);
 978         for (cidx = 0; cidx < 2; cidx++) {
 979                 devtype = -1;
 980                 switch (cidx) {
 981                 case SNDRV_PCM_STREAM_PLAYBACK:
 982                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 983                         break;
 984                 case SNDRV_PCM_STREAM_CAPTURE:
 985                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 986                         break;
 987                 }
 988                 snd_unregister_device(devtype, pcm->card, pcm->device);
 989                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 990                         snd_pcm_timer_done(substream);
 991         }
 992         list_for_each(list, &snd_pcm_notify_list) {
 993                 struct snd_pcm_notify *notify;
 994                 notify = list_entry(list, struct snd_pcm_notify, list);
 995                 notify->n_unregister(pcm);
 996         }
 997         up(&register_mutex);
 998         return snd_pcm_free(pcm);
 999 }
1000
1001 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1002 {
1003         struct list_head *p;
1004
1005         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1006         down(&register_mutex);
1007         if (nfree) {
1008                 list_del(&notify->list);
1009                 list_for_each(p, &snd_pcm_devices)
1010                         notify->n_unregister(list_entry(p,
1011                                                         struct snd_pcm, list));
1012         } else {
1013                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1014                 list_for_each(p, &snd_pcm_devices)
1015                         notify->n_register(list_entry(p, struct snd_pcm, list));
1016         }
1017         up(&register_mutex);
1018         return 0;
1019 }
1020
1021 #ifdef CONFIG_PROC_FS
1022 /*
1023  *  Info interface
1024  */
1025
1026 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1027                               struct snd_info_buffer *buffer)
1028 {
1029         struct list_head *p;
1030         struct snd_pcm *pcm;
1031
1032         down(&register_mutex);
1033         list_for_each(p, &snd_pcm_devices) {
1034                 pcm = list_entry(p, struct snd_pcm, list);
1035                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1036                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1037                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1038                         snd_iprintf(buffer, " : playback %i",
1039                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1040                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1041                         snd_iprintf(buffer, " : capture %i",
1042                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1043                 snd_iprintf(buffer, "\n");
1044         }
1045         up(&register_mutex);
1046 }
1047
1048 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1049
1050 static void snd_pcm_proc_init(void)
1051 {
1052         struct snd_info_entry *entry;
1053
1054         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1055                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128,
1056                                       snd_pcm_proc_read);
1057                 if (snd_info_register(entry) < 0) {
1058                         snd_info_free_entry(entry);
1059                         entry = NULL;
1060                 }
1061         }
1062         snd_pcm_proc_entry = entry;
1063 }
1064
1065 static void snd_pcm_proc_done(void)
1066 {
1067         if (snd_pcm_proc_entry)
1068                 snd_info_unregister(snd_pcm_proc_entry);
1069 }
1070
1071 #else /* !CONFIG_PROC_FS */
1072 #define snd_pcm_proc_init()
1073 #define snd_pcm_proc_done()
1074 #endif /* CONFIG_PROC_FS */
1075
1076
1077 /*
1078  *  ENTRY functions
1079  */
1080
1081 static int __init alsa_pcm_init(void)
1082 {
1083         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1084         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1085         snd_pcm_proc_init();
1086         return 0;
1087 }
1088
1089 static void __exit alsa_pcm_exit(void)
1090 {
1091         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1092         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1093         snd_pcm_proc_done();
1094 }
1095
1096 module_init(alsa_pcm_init)
1097 module_exit(alsa_pcm_exit)
1098
1099 EXPORT_SYMBOL(snd_pcm_new);
1100 EXPORT_SYMBOL(snd_pcm_new_stream);
1101 EXPORT_SYMBOL(snd_pcm_notify);
1102 EXPORT_SYMBOL(snd_pcm_open_substream);
1103 EXPORT_SYMBOL(snd_pcm_release_substream);
1104 EXPORT_SYMBOL(snd_pcm_format_name);
1105   /* pcm_native.c */
1106 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1107 #ifdef CONFIG_PM
1108 EXPORT_SYMBOL(snd_pcm_suspend);
1109 EXPORT_SYMBOL(snd_pcm_suspend_all);
1110 #endif
1111 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1112 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1113 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1114 EXPORT_SYMBOL(snd_pcm_mmap_data);
1115 #if SNDRV_PCM_INFO_MMAP_IOMEM
1116 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1117 #endif
1118  /* pcm_misc.c */
1119 EXPORT_SYMBOL(snd_pcm_format_signed);
1120 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1121 EXPORT_SYMBOL(snd_pcm_format_linear);
1122 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1123 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1124 EXPORT_SYMBOL(snd_pcm_format_width);
1125 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1126 EXPORT_SYMBOL(snd_pcm_format_size);
1127 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1128 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1129 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1130 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);