sound/core/pcm.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <linux/time.h>
  25 #include <linux/mutex.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@perex.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 DEFINE_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
  45 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
  46 {
  47         struct snd_pcm *pcm;
  48
  49         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  50                 if (pcm->card == card && pcm->device == device)
  51                         return pcm;
  52         }
  53         return NULL;
  54 }
  55
  56 static int snd_pcm_next(struct snd_card *card, int device)
  57 {
  58         struct snd_pcm *pcm;
  59
  60         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  61                 if (pcm->card == card && pcm->device > device)
  62                         return pcm->device;
  63                 else if (pcm->card->number > card->number)
  64                         return -1;
  65         }
  66         return -1;
  67 }
  68
  69 static int snd_pcm_add(struct snd_pcm *newpcm)
  70 {
  71         struct snd_pcm *pcm;
  72
  73         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  74                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
  75                         return -EBUSY;
  76                 if (pcm->card->number > newpcm->card->number ||
  77                                 (pcm->card == newpcm->card &&
  78                                 pcm->device > newpcm->device)) {
  79                         list_add(&newpcm->list, pcm->list.prev);
  80                         return 0;
  81                 }
  82         }
  83         list_add_tail(&newpcm->list, &snd_pcm_devices);
  84         return 0;
  85 }
  86
  87 static int snd_pcm_control_ioctl(struct snd_card *card,
  88                                  struct snd_ctl_file *control,
  89                                  unsigned int cmd, unsigned long arg)
  90 {
  91         switch (cmd) {
  92         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  93                 {
  94                         int device;
  95
  96                         if (get_user(device, (int __user *)arg))
  97                                 return -EFAULT;
  98                         mutex_lock(&register_mutex);
  99                         device = snd_pcm_next(card, device);
 100                         mutex_unlock(&register_mutex);
 101                         if (put_user(device, (int __user *)arg))
 102                                 return -EFAULT;
 103                         return 0;
 104                 }
 105         case SNDRV_CTL_IOCTL_PCM_INFO:
 106                 {
 107                         struct snd_pcm_info __user *info;
 108                         unsigned int device, subdevice;
 109                         int stream;
 110                         struct snd_pcm *pcm;
 111                         struct snd_pcm_str *pstr;
 112                         struct snd_pcm_substream *substream;
 113                         int err;
 114
 115                         info = (struct snd_pcm_info __user *)arg;
 116                         if (get_user(device, &info->device))
 117                                 return -EFAULT;
 118                         if (get_user(stream, &info->stream))
 119                                 return -EFAULT;
 120                         if (stream < 0 || stream > 1)
 121                                 return -EINVAL;
 122                         if (get_user(subdevice, &info->subdevice))
 123                                 return -EFAULT;
 124                         mutex_lock(&register_mutex);
 125                         pcm = snd_pcm_get(card, device);
 126                         if (pcm == NULL) {
 127                                 err = -ENXIO;
 128                                 goto _error;
 129                         }
 130                         pstr = &pcm->streams[stream];
 131                         if (pstr->substream_count == 0) {
 132                                 err = -ENOENT;
 133                                 goto _error;
 134                         }
 135                         if (subdevice >= pstr->substream_count) {
 136                                 err = -ENXIO;
 137                                 goto _error;
 138                         }
 139                         for (substream = pstr->substream; substream;
 140                              substream = substream->next)
 141                                 if (substream->number == (int)subdevice)
 142                                         break;
 143                         if (substream == NULL) {
 144                                 err = -ENXIO;
 145                                 goto _error;
 146                         }
 147                         err = snd_pcm_info_user(substream, info);
 148                 _error:
 149                         mutex_unlock(&register_mutex);
 150                         return err;
 151                 }
 152         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 153                 {
 154                         int val;
 155
 156                         if (get_user(val, (int __user *)arg))
 157                                 return -EFAULT;
 158                         control->prefer_pcm_subdevice = val;
 159                         return 0;
 160                 }
 161         }
 162         return -ENOIOCTLCMD;
 163 }
 164
 165 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 166
 167 static char *snd_pcm_format_names[] = {
 168         FORMAT(S8),
 169         FORMAT(U8),
 170         FORMAT(S16_LE),
 171         FORMAT(S16_BE),
 172         FORMAT(U16_LE),
 173         FORMAT(U16_BE),
 174         FORMAT(S24_LE),
 175         FORMAT(S24_BE),
 176         FORMAT(U24_LE),
 177         FORMAT(U24_BE),
 178         FORMAT(S32_LE),
 179         FORMAT(S32_BE),
 180         FORMAT(U32_LE),
 181         FORMAT(U32_BE),
 182         FORMAT(FLOAT_LE),
 183         FORMAT(FLOAT_BE),
 184         FORMAT(FLOAT64_LE),
 185         FORMAT(FLOAT64_BE),
 186         FORMAT(IEC958_SUBFRAME_LE),
 187         FORMAT(IEC958_SUBFRAME_BE),
 188         FORMAT(MU_LAW),
 189         FORMAT(A_LAW),
 190         FORMAT(IMA_ADPCM),
 191         FORMAT(MPEG),
 192         FORMAT(GSM),
 193         FORMAT(SPECIAL),
 194         FORMAT(S24_3LE),
 195         FORMAT(S24_3BE),
 196         FORMAT(U24_3LE),
 197         FORMAT(U24_3BE),
 198         FORMAT(S20_3LE),
 199         FORMAT(S20_3BE),
 200         FORMAT(U20_3LE),
 201         FORMAT(U20_3BE),
 202         FORMAT(S18_3LE),
 203         FORMAT(S18_3BE),
 204         FORMAT(U18_3LE),
 205         FORMAT(U18_3BE),
 206         FORMAT(G723_24),
 207         FORMAT(G723_24_1B),
 208         FORMAT(G723_40),
 209         FORMAT(G723_40_1B),
 210 };
 211
 212 const char *snd_pcm_format_name(snd_pcm_format_t format)
 213 {
 214         if (format >= ARRAY_SIZE(snd_pcm_format_names))
 215                 return "Unknown";
 216         return snd_pcm_format_names[format];
 217 }
 218 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
 219
 220 #ifdef CONFIG_SND_VERBOSE_PROCFS
 221
 222 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 223 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 224 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 225 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 226 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 227 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 228 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 229 #define START(v) [SNDRV_PCM_START_##v] = #v
 230 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 231
 232 static char *snd_pcm_stream_names[] = {
 233         STREAM(PLAYBACK),
 234         STREAM(CAPTURE),
 235 };
 236
 237 static char *snd_pcm_state_names[] = {
 238         STATE(OPEN),
 239         STATE(SETUP),
 240         STATE(PREPARED),
 241         STATE(RUNNING),
 242         STATE(XRUN),
 243         STATE(DRAINING),
 244         STATE(PAUSED),
 245         STATE(SUSPENDED),
 246 };
 247
 248 static char *snd_pcm_access_names[] = {
 249         ACCESS(MMAP_INTERLEAVED),
 250         ACCESS(MMAP_NONINTERLEAVED),
 251         ACCESS(MMAP_COMPLEX),
 252         ACCESS(RW_INTERLEAVED),
 253         ACCESS(RW_NONINTERLEAVED),
 254 };
 255
 256 static char *snd_pcm_subformat_names[] = {
 257         SUBFORMAT(STD),
 258 };
 259
 260 static char *snd_pcm_tstamp_mode_names[] = {
 261         TSTAMP(NONE),
 262         TSTAMP(ENABLE),
 263 };
 264
 265 static const char *snd_pcm_stream_name(int stream)
 266 {
 267         return snd_pcm_stream_names[stream];
 268 }
 269
 270 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 271 {
 272         return snd_pcm_access_names[access];
 273 }
 274
 275 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 276 {
 277         return snd_pcm_subformat_names[subformat];
 278 }
 279
 280 static const char *snd_pcm_tstamp_mode_name(int mode)
 281 {
 282         return snd_pcm_tstamp_mode_names[mode];
 283 }
 284
 285 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 286 {
 287         return snd_pcm_state_names[state];
 288 }
 289
 290 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 291 #include <linux/soundcard.h>
 292
 293 static const char *snd_pcm_oss_format_name(int format)
 294 {
 295         switch (format) {
 296         case AFMT_MU_LAW:
 297                 return "MU_LAW";
 298         case AFMT_A_LAW:
 299                 return "A_LAW";
 300         case AFMT_IMA_ADPCM:
 301                 return "IMA_ADPCM";
 302         case AFMT_U8:
 303                 return "U8";
 304         case AFMT_S16_LE:
 305                 return "S16_LE";
 306         case AFMT_S16_BE:
 307                 return "S16_BE";
 308         case AFMT_S8:
 309                 return "S8";
 310         case AFMT_U16_LE:
 311                 return "U16_LE";
 312         case AFMT_U16_BE:
 313                 return "U16_BE";
 314         case AFMT_MPEG:
 315                 return "MPEG";
 316         default:
 317                 return "unknown";
 318         }
 319 }
 320 #endif
 321
 322 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 323                                    struct snd_info_buffer *buffer)
 324 {
 325         struct snd_pcm_info *info;
 326         int err;
 327
 328         if (! substream)
 329                 return;
 330
 331         info = kmalloc(sizeof(*info), GFP_KERNEL);
 332         if (! info) {
 333                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 334                 return;
 335         }
 336
 337         err = snd_pcm_info(substream, info);
 338         if (err < 0) {
 339                 snd_iprintf(buffer, "error %d\n", err);
 340                 kfree(info);
 341                 return;
 342         }
 343         snd_iprintf(buffer, "card: %d\n", info->card);
 344         snd_iprintf(buffer, "device: %d\n", info->device);
 345         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 346         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 347         snd_iprintf(buffer, "id: %s\n", info->id);
 348         snd_iprintf(buffer, "name: %s\n", info->name);
 349         snd_iprintf(buffer, "subname: %s\n", info->subname);
 350         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 351         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 352         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 353         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 354         kfree(info);
 355 }
 356
 357 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 358                                           struct snd_info_buffer *buffer)
 359 {
 360         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 361                                buffer);
 362 }
 363
 364 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 365                                              struct snd_info_buffer *buffer)
 366 {
 367         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 368                                buffer);
 369 }
 370
 371 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 372                                                   struct snd_info_buffer *buffer)
 373 {
 374         struct snd_pcm_substream *substream = entry->private_data;
 375         struct snd_pcm_runtime *runtime;
 376
 377         mutex_lock(&substream->pcm->open_mutex);
 378         runtime = substream->runtime;
 379         if (!runtime) {
 380                 snd_iprintf(buffer, "closed\n");
 381                 goto unlock;
 382         }
 383         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 384                 snd_iprintf(buffer, "no setup\n");
 385                 goto unlock;
 386         }
 387         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 388         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 389         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 390         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 391         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 392         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 393         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 395         if (substream->oss.oss) {
 396                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 397                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 398                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 399                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 400                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 401                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 402         }
 403 #endif
 404  unlock:
 405         mutex_unlock(&substream->pcm->open_mutex);
 406 }
 407
 408 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 409                                                   struct snd_info_buffer *buffer)
 410 {
 411         struct snd_pcm_substream *substream = entry->private_data;
 412         struct snd_pcm_runtime *runtime;
 413
 414         mutex_lock(&substream->pcm->open_mutex);
 415         runtime = substream->runtime;
 416         if (!runtime) {
 417                 snd_iprintf(buffer, "closed\n");
 418                 goto unlock;
 419         }
 420         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 421                 snd_iprintf(buffer, "no setup\n");
 422                 goto unlock;
 423         }
 424         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 425         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 426         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 427         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 428         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 429         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 430         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 431         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 432  unlock:
 433         mutex_unlock(&substream->pcm->open_mutex);
 434 }
 435
 436 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 437                                                struct snd_info_buffer *buffer)
 438 {
 439         struct snd_pcm_substream *substream = entry->private_data;
 440         struct snd_pcm_runtime *runtime;
 441         struct snd_pcm_status status;
 442         int err;
 443
 444         mutex_lock(&substream->pcm->open_mutex);
 445         runtime = substream->runtime;
 446         if (!runtime) {
 447                 snd_iprintf(buffer, "closed\n");
 448                 goto unlock;
 449         }
 450         memset(&status, 0, sizeof(status));
 451         err = snd_pcm_status(substream, &status);
 452         if (err < 0) {
 453                 snd_iprintf(buffer, "error %d\n", err);
 454                 goto unlock;
 455         }
 456         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 457         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
 458         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 459                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 460         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 461                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 462         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 463         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 464         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 465         snd_iprintf(buffer, "-----\n");
 466         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 467         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 468  unlock:
 469         mutex_unlock(&substream->pcm->open_mutex);
 470 }
 471
 472 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 473 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 474                                     struct snd_info_buffer *buffer)
 475 {
 476         struct snd_pcm_str *pstr = entry->private_data;
 477         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 478 }
 479
 480 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 481                                      struct snd_info_buffer *buffer)
 482 {
 483         struct snd_pcm_str *pstr = entry->private_data;
 484         char line[64];
 485         if (!snd_info_get_line(buffer, line, sizeof(line)))
 486                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 487 }
 488 #endif
 489
 490 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 491 {
 492         struct snd_pcm *pcm = pstr->pcm;
 493         struct snd_info_entry *entry;
 494         char name[16];
 495
 496         sprintf(name, "pcm%i%c", pcm->device,
 497                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 498         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 499                 return -ENOMEM;
 500         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 501         if (snd_info_register(entry) < 0) {
 502                 snd_info_free_entry(entry);
 503                 return -ENOMEM;
 504         }
 505         pstr->proc_root = entry;
 506
 507         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 508                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 509                 if (snd_info_register(entry) < 0) {
 510                         snd_info_free_entry(entry);
 511                         entry = NULL;
 512                 }
 513         }
 514         pstr->proc_info_entry = entry;
 515
 516 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 517         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 518                                                 pstr->proc_root)) != NULL) {
 519                 entry->c.text.read = snd_pcm_xrun_debug_read;
 520                 entry->c.text.write = snd_pcm_xrun_debug_write;
 521                 entry->mode |= S_IWUSR;
 522                 entry->private_data = pstr;
 523                 if (snd_info_register(entry) < 0) {
 524                         snd_info_free_entry(entry);
 525                         entry = NULL;
 526                 }
 527         }
 528         pstr->proc_xrun_debug_entry = entry;
 529 #endif
 530         return 0;
 531 }
 532
 533 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 534 {
 535 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 536         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 537         pstr->proc_xrun_debug_entry = NULL;
 538 #endif
 539         snd_info_free_entry(pstr->proc_info_entry);
 540         pstr->proc_info_entry = NULL;
 541         snd_info_free_entry(pstr->proc_root);
 542         pstr->proc_root = NULL;
 543         return 0;
 544 }
 545
 546 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 547 {
 548         struct snd_info_entry *entry;
 549         struct snd_card *card;
 550         char name[16];
 551
 552         card = substream->pcm->card;
 553
 554         sprintf(name, "sub%i", substream->number);
 555         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 556                 return -ENOMEM;
 557         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 558         if (snd_info_register(entry) < 0) {
 559                 snd_info_free_entry(entry);
 560                 return -ENOMEM;
 561         }
 562         substream->proc_root = entry;
 563
 564         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 565                 snd_info_set_text_ops(entry, substream,
 566                                       snd_pcm_substream_proc_info_read);
 567                 if (snd_info_register(entry) < 0) {
 568                         snd_info_free_entry(entry);
 569                         entry = NULL;
 570                 }
 571         }
 572         substream->proc_info_entry = entry;
 573
 574         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 575                 snd_info_set_text_ops(entry, substream,
 576                                       snd_pcm_substream_proc_hw_params_read);
 577                 if (snd_info_register(entry) < 0) {
 578                         snd_info_free_entry(entry);
 579                         entry = NULL;
 580                 }
 581         }
 582         substream->proc_hw_params_entry = entry;
 583
 584         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 585                 snd_info_set_text_ops(entry, substream,
 586                                       snd_pcm_substream_proc_sw_params_read);
 587                 if (snd_info_register(entry) < 0) {
 588                         snd_info_free_entry(entry);
 589                         entry = NULL;
 590                 }
 591         }
 592         substream->proc_sw_params_entry = entry;
 593
 594         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 595                 snd_info_set_text_ops(entry, substream,
 596                                       snd_pcm_substream_proc_status_read);
 597                 if (snd_info_register(entry) < 0) {
 598                         snd_info_free_entry(entry);
 599                         entry = NULL;
 600                 }
 601         }
 602         substream->proc_status_entry = entry;
 603
 604         return 0;
 605 }
 606
 607 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 608 {
 609         snd_info_free_entry(substream->proc_info_entry);
 610         substream->proc_info_entry = NULL;
 611         snd_info_free_entry(substream->proc_hw_params_entry);
 612         substream->proc_hw_params_entry = NULL;
 613         snd_info_free_entry(substream->proc_sw_params_entry);
 614         substream->proc_sw_params_entry = NULL;
 615         snd_info_free_entry(substream->proc_status_entry);
 616         substream->proc_status_entry = NULL;
 617         snd_info_free_entry(substream->proc_root);
 618         substream->proc_root = NULL;
 619         return 0;
 620 }
 621 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 622 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 623 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 624 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 625 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 626 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 627
 628 /**
 629  * snd_pcm_new_stream - create a new PCM stream
 630  * @pcm: the pcm instance
 631  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 632  * @substream_count: the number of substreams
 633  *
 634  * Creates a new stream for the pcm.
 635  * The corresponding stream on the pcm must have been empty before
 636  * calling this, i.e. zero must be given to the argument of
 637  * snd_pcm_new().
 638  *
 639  * Returns zero if successful, or a negative error code on failure.
 640  */
 641 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 642 {
 643         int idx, err;
 644         struct snd_pcm_str *pstr = &pcm->streams[stream];
 645         struct snd_pcm_substream *substream, *prev;
 646
 647 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 648         mutex_init(&pstr->oss.setup_mutex);
 649 #endif
 650         pstr->stream = stream;
 651         pstr->pcm = pcm;
 652         pstr->substream_count = substream_count;
 653         if (substream_count > 0) {
 654                 err = snd_pcm_stream_proc_init(pstr);
 655                 if (err < 0) {
 656                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 657                         return err;
 658                 }
 659         }
 660         prev = NULL;
 661         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 662                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 663                 if (substream == NULL) {
 664                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 665                         return -ENOMEM;
 666                 }
 667                 substream->pcm = pcm;
 668                 substream->pstr = pstr;
 669                 substream->number = idx;
 670                 substream->stream = stream;
 671                 sprintf(substream->name, "subdevice #%i", idx);
 672                 substream->buffer_bytes_max = UINT_MAX;
 673                 if (prev == NULL)
 674                         pstr->substream = substream;
 675                 else
 676                         prev->next = substream;
 677                 err = snd_pcm_substream_proc_init(substream);
 678                 if (err < 0) {
 679                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 680                         if (prev == NULL)
 681                                 pstr->substream = NULL;
 682                         else
 683                                 prev->next = NULL;
 684                         kfree(substream);
 685                         return err;
 686                 }
 687                 substream->group = &substream->self_group;
 688                 spin_lock_init(&substream->self_group.lock);
 689                 INIT_LIST_HEAD(&substream->self_group.substreams);
 690                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 691                 atomic_set(&substream->mmap_count, 0);
 692                 prev = substream;
 693         }
 694         return 0;
 695 }
 696
 697 EXPORT_SYMBOL(snd_pcm_new_stream);
 698
 699 /**
 700  * snd_pcm_new - create a new PCM instance
 701  * @card: the card instance
 702  * @id: the id string
 703  * @device: the device index (zero based)
 704  * @playback_count: the number of substreams for playback
 705  * @capture_count: the number of substreams for capture
 706  * @rpcm: the pointer to store the new pcm instance
 707  *
 708  * Creates a new PCM instance.
 709  *
 710  * The pcm operators have to be set afterwards to the new instance
 711  * via snd_pcm_set_ops().
 712  *
 713  * Returns zero if successful, or a negative error code on failure.
 714  */
 715 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 716                 int playback_count, int capture_count,
 717                 struct snd_pcm ** rpcm)
 718 {
 719         struct snd_pcm *pcm;
 720         int err;
 721         static struct snd_device_ops ops = {
 722                 .dev_free = snd_pcm_dev_free,
 723                 .dev_register = snd_pcm_dev_register,
 724                 .dev_disconnect = snd_pcm_dev_disconnect,
 725         };
 726
 727         if (snd_BUG_ON(!card))
 728                 return -ENXIO;
 729         if (rpcm)
 730                 *rpcm = NULL;
 731         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 732         if (pcm == NULL) {
 733                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 734                 return -ENOMEM;
 735         }
 736         pcm->card = card;
 737         pcm->device = device;
 738         if (id)
 739                 strlcpy(pcm->id, id, sizeof(pcm->id));
 740         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 741                 snd_pcm_free(pcm);
 742                 return err;
 743         }
 744         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 745                 snd_pcm_free(pcm);
 746                 return err;
 747         }
 748         mutex_init(&pcm->open_mutex);
 749         init_waitqueue_head(&pcm->open_wait);
 750         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 751                 snd_pcm_free(pcm);
 752                 return err;
 753         }
 754         if (rpcm)
 755                 *rpcm = pcm;
 756         return 0;
 757 }
 758
 759 EXPORT_SYMBOL(snd_pcm_new);
 760
 761 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 762 {
 763         struct snd_pcm_substream *substream, *substream_next;
 764 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 765         struct snd_pcm_oss_setup *setup, *setupn;
 766 #endif
 767         substream = pstr->substream;
 768         while (substream) {
 769                 substream_next = substream->next;
 770                 snd_pcm_timer_done(substream);
 771                 snd_pcm_substream_proc_done(substream);
 772                 kfree(substream);
 773                 substream = substream_next;
 774         }
 775         snd_pcm_stream_proc_done(pstr);
 776 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 777         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 778                 setupn = setup->next;
 779                 kfree(setup->task_name);
 780                 kfree(setup);
 781         }
 782 #endif
 783 }
 784
 785 static int snd_pcm_free(struct snd_pcm *pcm)
 786 {
 787         struct snd_pcm_notify *notify;
 788
 789         if (!pcm)
 790                 return 0;
 791         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 792                 notify->n_unregister(pcm);
 793         }
 794         if (pcm->private_free)
 795                 pcm->private_free(pcm);
 796         snd_pcm_lib_preallocate_free_for_all(pcm);
 797         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 798         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 799         kfree(pcm);
 800         return 0;
 801 }
 802
 803 static int snd_pcm_dev_free(struct snd_device *device)
 804 {
 805         struct snd_pcm *pcm = device->device_data;
 806         return snd_pcm_free(pcm);
 807 }
 808
 809 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 810                              struct file *file,
 811                              struct snd_pcm_substream **rsubstream)
 812 {
 813         struct snd_pcm_str * pstr;
 814         struct snd_pcm_substream *substream;
 815         struct snd_pcm_runtime *runtime;
 816         struct snd_ctl_file *kctl;
 817         struct snd_card *card;
 818         int prefer_subdevice = -1;
 819         size_t size;
 820
 821         if (snd_BUG_ON(!pcm || !rsubstream))
 822                 return -ENXIO;
 823         *rsubstream = NULL;
 824         pstr = &pcm->streams[stream];
 825         if (pstr->substream == NULL || pstr->substream_count == 0)
 826                 return -ENODEV;
 827
 828         card = pcm->card;
 829         read_lock(&card->ctl_files_rwlock);
 830         list_for_each_entry(kctl, &card->ctl_files, list) {
 831                 if (kctl->pid == task_pid(current)) {
 832                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 833                         if (prefer_subdevice != -1)
 834                                 break;
 835                 }
 836         }
 837         read_unlock(&card->ctl_files_rwlock);
 838
 839         switch (stream) {
 840         case SNDRV_PCM_STREAM_PLAYBACK:
 841                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 842                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 843                                 if (SUBSTREAM_BUSY(substream))
 844                                         return -EAGAIN;
 845                         }
 846                 }
 847                 break;
 848         case SNDRV_PCM_STREAM_CAPTURE:
 849                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 850                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 851                                 if (SUBSTREAM_BUSY(substream))
 852                                         return -EAGAIN;
 853                         }
 854                 }
 855                 break;
 856         default:
 857                 return -EINVAL;
 858         }
 859
 860         if (file->f_flags & O_APPEND) {
 861                 if (prefer_subdevice < 0) {
 862                         if (pstr->substream_count > 1)
 863                                 return -EINVAL; /* must be unique */
 864                         substream = pstr->substream;
 865                 } else {
 866                         for (substream = pstr->substream; substream;
 867                              substream = substream->next)
 868                                 if (substream->number == prefer_subdevice)
 869                                         break;
 870                 }
 871                 if (! substream)
 872                         return -ENODEV;
 873                 if (! SUBSTREAM_BUSY(substream))
 874                         return -EBADFD;
 875                 substream->ref_count++;
 876                 *rsubstream = substream;
 877                 return 0;
 878         }
 879
 880         if (prefer_subdevice >= 0) {
 881                 for (substream = pstr->substream; substream; substream = substream->next)
 882                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 883                                 goto __ok;
 884         }
 885         for (substream = pstr->substream; substream; substream = substream->next)
 886                 if (!SUBSTREAM_BUSY(substream))
 887                         break;
 888       __ok:
 889         if (substream == NULL)
 890                 return -EAGAIN;
 891
 892         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 893         if (runtime == NULL)
 894                 return -ENOMEM;
 895
 896         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 897         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 898         if (runtime->status == NULL) {
 899                 kfree(runtime);
 900                 return -ENOMEM;
 901         }
 902         memset((void*)runtime->status, 0, size);
 903
 904         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 905         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 906         if (runtime->control == NULL) {
 907                 snd_free_pages((void*)runtime->status,
 908                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 909                 kfree(runtime);
 910                 return -ENOMEM;
 911         }
 912         memset((void*)runtime->control, 0, size);
 913
 914         init_waitqueue_head(&runtime->sleep);
 915         init_waitqueue_head(&runtime->tsleep);
 916
 917         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 918
 919         substream->runtime = runtime;
 920         substream->private_data = pcm->private_data;
 921         substream->ref_count = 1;
 922         substream->f_flags = file->f_flags;
 923         substream->pid = get_pid(task_pid(current));
 924         pstr->substream_opened++;
 925         *rsubstream = substream;
 926         return 0;
 927 }
 928
 929 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 930 {
 931         struct snd_pcm_runtime *runtime;
 932
 933         if (PCM_RUNTIME_CHECK(substream))
 934                 return;
 935         runtime = substream->runtime;
 936         if (runtime->private_free != NULL)
 937                 runtime->private_free(runtime);
 938         snd_free_pages((void*)runtime->status,
 939                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 940         snd_free_pages((void*)runtime->control,
 941                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 942         kfree(runtime->hw_constraints.rules);
 943 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 944         if (runtime->hwptr_log)
 945                 kfree(runtime->hwptr_log);
 946 #endif
 947         kfree(runtime);
 948         substream->runtime = NULL;
 949         put_pid(substream->pid);
 950         substream->pid = NULL;
 951         substream->pstr->substream_opened--;
 952 }
 953
 954 static ssize_t show_pcm_class(struct device *dev,
 955                               struct device_attribute *attr, char *buf)
 956 {
 957         struct snd_pcm *pcm;
 958         const char *str;
 959         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
 960                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
 961                 [SNDRV_PCM_CLASS_MULTI] = "multi",
 962                 [SNDRV_PCM_CLASS_MODEM] = "modem",
 963                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
 964         };
 965
 966         if (! (pcm = dev_get_drvdata(dev)) ||
 967             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
 968                 str = "none";
 969         else
 970                 str = strs[pcm->dev_class];
 971         return snprintf(buf, PAGE_SIZE, "%s\n", str);
 972 }
 973
 974 static struct device_attribute pcm_attrs =
 975         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 976
 977 static int snd_pcm_dev_register(struct snd_device *device)
 978 {
 979         int cidx, err;
 980         struct snd_pcm_substream *substream;
 981         struct snd_pcm_notify *notify;
 982         char str[16];
 983         struct snd_pcm *pcm;
 984         struct device *dev;
 985
 986         if (snd_BUG_ON(!device || !device->device_data))
 987                 return -ENXIO;
 988         pcm = device->device_data;
 989         mutex_lock(&register_mutex);
 990         err = snd_pcm_add(pcm);
 991         if (err) {
 992                 mutex_unlock(&register_mutex);
 993                 return err;
 994         }
 995         for (cidx = 0; cidx < 2; cidx++) {
 996                 int devtype = -1;
 997                 if (pcm->streams[cidx].substream == NULL)
 998                         continue;
 999                 switch (cidx) {
1000                 case SNDRV_PCM_STREAM_PLAYBACK:
1001                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1002                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1003                         break;
1004                 case SNDRV_PCM_STREAM_CAPTURE:
1005                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1006                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1007                         break;
1008                 }
1009                 /* device pointer to use, pcm->dev takes precedence if
1010                  * it is assigned, otherwise fall back to card's device
1011                  * if possible */
1012                 dev = pcm->dev;
1013                 if (!dev)
1014                         dev = snd_card_get_device_link(pcm->card);
1015                 /* register pcm */
1016                 err = snd_register_device_for_dev(devtype, pcm->card,
1017                                                   pcm->device,
1018                                                   &snd_pcm_f_ops[cidx],
1019                                                   pcm, str, dev);
1020                 if (err < 0) {
1021                         list_del(&pcm->list);
1022                         mutex_unlock(&register_mutex);
1023                         return err;
1024                 }
1025                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1026                                           &pcm_attrs);
1027                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1028                         snd_pcm_timer_init(substream);
1029         }
1030
1031         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1032                 notify->n_register(pcm);
1033
1034         mutex_unlock(&register_mutex);
1035         return 0;
1036 }
1037
1038 static int snd_pcm_dev_disconnect(struct snd_device *device)
1039 {
1040         struct snd_pcm *pcm = device->device_data;
1041         struct snd_pcm_notify *notify;
1042         struct snd_pcm_substream *substream;
1043         int cidx, devtype;
1044
1045         mutex_lock(&register_mutex);
1046         if (list_empty(&pcm->list))
1047                 goto unlock;
1048
1049         list_del_init(&pcm->list);
1050         for (cidx = 0; cidx < 2; cidx++)
1051                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1052                         if (substream->runtime)
1053                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1054         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1055                 notify->n_disconnect(pcm);
1056         }
1057         for (cidx = 0; cidx < 2; cidx++) {
1058                 devtype = -1;
1059                 switch (cidx) {
1060                 case SNDRV_PCM_STREAM_PLAYBACK:
1061                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1062                         break;
1063                 case SNDRV_PCM_STREAM_CAPTURE:
1064                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1065                         break;
1066                 }
1067                 snd_unregister_device(devtype, pcm->card, pcm->device);
1068         }
1069  unlock:
1070         mutex_unlock(&register_mutex);
1071         return 0;
1072 }
1073
1074 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1075 {
1076         struct snd_pcm *pcm;
1077
1078         if (snd_BUG_ON(!notify ||
1079                        !notify->n_register ||
1080                        !notify->n_unregister ||
1081                        !notify->n_disconnect))
1082                 return -EINVAL;
1083         mutex_lock(&register_mutex);
1084         if (nfree) {
1085                 list_del(&notify->list);
1086                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1087                         notify->n_unregister(pcm);
1088         } else {
1089                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1090                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1091                         notify->n_register(pcm);
1092         }
1093         mutex_unlock(&register_mutex);
1094         return 0;
1095 }
1096
1097 EXPORT_SYMBOL(snd_pcm_notify);
1098
1099 #ifdef CONFIG_PROC_FS
1100 /*
1101  *  Info interface
1102  */
1103
1104 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1105                               struct snd_info_buffer *buffer)
1106 {
1107         struct snd_pcm *pcm;
1108
1109         mutex_lock(&register_mutex);
1110         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1111                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1112                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1113                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1114                         snd_iprintf(buffer, " : playback %i",
1115                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1116                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1117                         snd_iprintf(buffer, " : capture %i",
1118                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1119                 snd_iprintf(buffer, "\n");
1120         }
1121         mutex_unlock(&register_mutex);
1122 }
1123
1124 static struct snd_info_entry *snd_pcm_proc_entry;
1125
1126 static void snd_pcm_proc_init(void)
1127 {
1128         struct snd_info_entry *entry;
1129
1130         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1131                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1132                 if (snd_info_register(entry) < 0) {
1133                         snd_info_free_entry(entry);
1134                         entry = NULL;
1135                 }
1136         }
1137         snd_pcm_proc_entry = entry;
1138 }
1139
1140 static void snd_pcm_proc_done(void)
1141 {
1142         snd_info_free_entry(snd_pcm_proc_entry);
1143 }
1144
1145 #else /* !CONFIG_PROC_FS */
1146 #define snd_pcm_proc_init()
1147 #define snd_pcm_proc_done()
1148 #endif /* CONFIG_PROC_FS */
1149
1150
1151 /*
1152  *  ENTRY functions
1153  */
1154
1155 static int __init alsa_pcm_init(void)
1156 {
1157         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1158         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1159         snd_pcm_proc_init();
1160         return 0;
1161 }
1162
1163 static void __exit alsa_pcm_exit(void)
1164 {
1165         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1166         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1167         snd_pcm_proc_done();
1168 }
1169
1170 module_init(alsa_pcm_init)
1171 module_exit(alsa_pcm_exit)