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