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/module.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <linux/device.h>
  28 #include <sound/core.h>
  29 #include <sound/minors.h>
  30 #include <sound/pcm.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33
  34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  35 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  36 MODULE_LICENSE("GPL");
  37
  38 static LIST_HEAD(snd_pcm_devices);
  39 static LIST_HEAD(snd_pcm_notify_list);
  40 static DEFINE_MUTEX(register_mutex);
  41
  42 static int snd_pcm_free(struct snd_pcm *pcm);
  43 static int snd_pcm_dev_free(struct snd_device *device);
  44 static int snd_pcm_dev_register(struct snd_device *device);
  45 static int snd_pcm_dev_disconnect(struct snd_device *device);
  46
  47 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
  48 {
  49         struct snd_pcm *pcm;
  50
  51         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  52                 if (pcm->card == card && pcm->device == device)
  53                         return pcm;
  54         }
  55         return NULL;
  56 }
  57
  58 static int snd_pcm_next(struct snd_card *card, int device)
  59 {
  60         struct snd_pcm *pcm;
  61
  62         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  63                 if (pcm->card == card && pcm->device > device)
  64                         return pcm->device;
  65                 else if (pcm->card->number > card->number)
  66                         return -1;
  67         }
  68         return -1;
  69 }
  70
  71 static int snd_pcm_add(struct snd_pcm *newpcm)
  72 {
  73         struct snd_pcm *pcm;
  74
  75         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  76                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
  77                         return -EBUSY;
  78                 if (pcm->card->number > newpcm->card->number ||
  79                                 (pcm->card == newpcm->card &&
  80                                 pcm->device > newpcm->device)) {
  81                         list_add(&newpcm->list, pcm->list.prev);
  82                         return 0;
  83                 }
  84         }
  85         list_add_tail(&newpcm->list, &snd_pcm_devices);
  86         return 0;
  87 }
  88
  89 static int snd_pcm_control_ioctl(struct snd_card *card,
  90                                  struct snd_ctl_file *control,
  91                                  unsigned int cmd, unsigned long arg)
  92 {
  93         switch (cmd) {
  94         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  95                 {
  96                         int device;
  97
  98                         if (get_user(device, (int __user *)arg))
  99                                 return -EFAULT;
 100                         mutex_lock(&register_mutex);
 101                         device = snd_pcm_next(card, device);
 102                         mutex_unlock(&register_mutex);
 103                         if (put_user(device, (int __user *)arg))
 104                                 return -EFAULT;
 105                         return 0;
 106                 }
 107         case SNDRV_CTL_IOCTL_PCM_INFO:
 108                 {
 109                         struct snd_pcm_info __user *info;
 110                         unsigned int device, subdevice;
 111                         int stream;
 112                         struct snd_pcm *pcm;
 113                         struct snd_pcm_str *pstr;
 114                         struct snd_pcm_substream *substream;
 115                         int err;
 116
 117                         info = (struct snd_pcm_info __user *)arg;
 118                         if (get_user(device, &info->device))
 119                                 return -EFAULT;
 120                         if (get_user(stream, &info->stream))
 121                                 return -EFAULT;
 122                         if (stream < 0 || stream > 1)
 123                                 return -EINVAL;
 124                         if (get_user(subdevice, &info->subdevice))
 125                                 return -EFAULT;
 126                         mutex_lock(&register_mutex);
 127                         pcm = snd_pcm_get(card, device);
 128                         if (pcm == NULL) {
 129                                 err = -ENXIO;
 130                                 goto _error;
 131                         }
 132                         pstr = &pcm->streams[stream];
 133                         if (pstr->substream_count == 0) {
 134                                 err = -ENOENT;
 135                                 goto _error;
 136                         }
 137                         if (subdevice >= pstr->substream_count) {
 138                                 err = -ENXIO;
 139                                 goto _error;
 140                         }
 141                         for (substream = pstr->substream; substream;
 142                              substream = substream->next)
 143                                 if (substream->number == (int)subdevice)
 144                                         break;
 145                         if (substream == NULL) {
 146                                 err = -ENXIO;
 147                                 goto _error;
 148                         }
 149                         err = snd_pcm_info_user(substream, info);
 150                 _error:
 151                         mutex_unlock(&register_mutex);
 152                         return err;
 153                 }
 154         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 155                 {
 156                         int val;
 157
 158                         if (get_user(val, (int __user *)arg))
 159                                 return -EFAULT;
 160                         control->prefer_pcm_subdevice = val;
 161                         return 0;
 162                 }
 163         }
 164         return -ENOIOCTLCMD;
 165 }
 166
 167 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 168
 169 static char *snd_pcm_format_names[] = {
 170         FORMAT(S8),
 171         FORMAT(U8),
 172         FORMAT(S16_LE),
 173         FORMAT(S16_BE),
 174         FORMAT(U16_LE),
 175         FORMAT(U16_BE),
 176         FORMAT(S24_LE),
 177         FORMAT(S24_BE),
 178         FORMAT(U24_LE),
 179         FORMAT(U24_BE),
 180         FORMAT(S32_LE),
 181         FORMAT(S32_BE),
 182         FORMAT(U32_LE),
 183         FORMAT(U32_BE),
 184         FORMAT(FLOAT_LE),
 185         FORMAT(FLOAT_BE),
 186         FORMAT(FLOAT64_LE),
 187         FORMAT(FLOAT64_BE),
 188         FORMAT(IEC958_SUBFRAME_LE),
 189         FORMAT(IEC958_SUBFRAME_BE),
 190         FORMAT(MU_LAW),
 191         FORMAT(A_LAW),
 192         FORMAT(IMA_ADPCM),
 193         FORMAT(MPEG),
 194         FORMAT(GSM),
 195         FORMAT(SPECIAL),
 196         FORMAT(S24_3LE),
 197         FORMAT(S24_3BE),
 198         FORMAT(U24_3LE),
 199         FORMAT(U24_3BE),
 200         FORMAT(S20_3LE),
 201         FORMAT(S20_3BE),
 202         FORMAT(U20_3LE),
 203         FORMAT(U20_3BE),
 204         FORMAT(S18_3LE),
 205         FORMAT(S18_3BE),
 206         FORMAT(U18_3LE),
 207         FORMAT(U18_3BE),
 208         FORMAT(G723_24),
 209         FORMAT(G723_24_1B),
 210         FORMAT(G723_40),
 211         FORMAT(G723_40_1B),
 212         FORMAT(DSD_U8),
 213         FORMAT(DSD_U16_LE),
 214 };
 215
 216 const char *snd_pcm_format_name(snd_pcm_format_t format)
 217 {
 218         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
 219                 return "Unknown";
 220         return snd_pcm_format_names[(__force unsigned int)format];
 221 }
 222 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
 223
 224 #ifdef CONFIG_SND_VERBOSE_PROCFS
 225
 226 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 227 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 228 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 229 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 230 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 231 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 232 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 233 #define START(v) [SNDRV_PCM_START_##v] = #v
 234 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 235
 236 static char *snd_pcm_stream_names[] = {
 237         STREAM(PLAYBACK),
 238         STREAM(CAPTURE),
 239 };
 240
 241 static char *snd_pcm_state_names[] = {
 242         STATE(OPEN),
 243         STATE(SETUP),
 244         STATE(PREPARED),
 245         STATE(RUNNING),
 246         STATE(XRUN),
 247         STATE(DRAINING),
 248         STATE(PAUSED),
 249         STATE(SUSPENDED),
 250 };
 251
 252 static char *snd_pcm_access_names[] = {
 253         ACCESS(MMAP_INTERLEAVED),
 254         ACCESS(MMAP_NONINTERLEAVED),
 255         ACCESS(MMAP_COMPLEX),
 256         ACCESS(RW_INTERLEAVED),
 257         ACCESS(RW_NONINTERLEAVED),
 258 };
 259
 260 static char *snd_pcm_subformat_names[] = {
 261         SUBFORMAT(STD),
 262 };
 263
 264 static char *snd_pcm_tstamp_mode_names[] = {
 265         TSTAMP(NONE),
 266         TSTAMP(ENABLE),
 267 };
 268
 269 static const char *snd_pcm_stream_name(int stream)
 270 {
 271         return snd_pcm_stream_names[stream];
 272 }
 273
 274 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 275 {
 276         return snd_pcm_access_names[(__force int)access];
 277 }
 278
 279 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 280 {
 281         return snd_pcm_subformat_names[(__force int)subformat];
 282 }
 283
 284 static const char *snd_pcm_tstamp_mode_name(int mode)
 285 {
 286         return snd_pcm_tstamp_mode_names[mode];
 287 }
 288
 289 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 290 {
 291         return snd_pcm_state_names[(__force int)state];
 292 }
 293
 294 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 295 #include <linux/soundcard.h>
 296
 297 static const char *snd_pcm_oss_format_name(int format)
 298 {
 299         switch (format) {
 300         case AFMT_MU_LAW:
 301                 return "MU_LAW";
 302         case AFMT_A_LAW:
 303                 return "A_LAW";
 304         case AFMT_IMA_ADPCM:
 305                 return "IMA_ADPCM";
 306         case AFMT_U8:
 307                 return "U8";
 308         case AFMT_S16_LE:
 309                 return "S16_LE";
 310         case AFMT_S16_BE:
 311                 return "S16_BE";
 312         case AFMT_S8:
 313                 return "S8";
 314         case AFMT_U16_LE:
 315                 return "U16_LE";
 316         case AFMT_U16_BE:
 317                 return "U16_BE";
 318         case AFMT_MPEG:
 319                 return "MPEG";
 320         default:
 321                 return "unknown";
 322         }
 323 }
 324 #endif
 325
 326 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 327                                    struct snd_info_buffer *buffer)
 328 {
 329         struct snd_pcm_info *info;
 330         int err;
 331
 332         if (! substream)
 333                 return;
 334
 335         info = kmalloc(sizeof(*info), GFP_KERNEL);
 336         if (! info) {
 337                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 338                 return;
 339         }
 340
 341         err = snd_pcm_info(substream, info);
 342         if (err < 0) {
 343                 snd_iprintf(buffer, "error %d\n", err);
 344                 kfree(info);
 345                 return;
 346         }
 347         snd_iprintf(buffer, "card: %d\n", info->card);
 348         snd_iprintf(buffer, "device: %d\n", info->device);
 349         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 350         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 351         snd_iprintf(buffer, "id: %s\n", info->id);
 352         snd_iprintf(buffer, "name: %s\n", info->name);
 353         snd_iprintf(buffer, "subname: %s\n", info->subname);
 354         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 355         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 356         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 357         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 358         kfree(info);
 359 }
 360
 361 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 362                                           struct snd_info_buffer *buffer)
 363 {
 364         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 365                                buffer);
 366 }
 367
 368 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 369                                              struct snd_info_buffer *buffer)
 370 {
 371         snd_pcm_proc_info_read(entry->private_data, buffer);
 372 }
 373
 374 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 375                                                   struct snd_info_buffer *buffer)
 376 {
 377         struct snd_pcm_substream *substream = entry->private_data;
 378         struct snd_pcm_runtime *runtime;
 379
 380         mutex_lock(&substream->pcm->open_mutex);
 381         runtime = substream->runtime;
 382         if (!runtime) {
 383                 snd_iprintf(buffer, "closed\n");
 384                 goto unlock;
 385         }
 386         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 387                 snd_iprintf(buffer, "no setup\n");
 388                 goto unlock;
 389         }
 390         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 391         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 392         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 393         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 394         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 395         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 396         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 397 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 398         if (substream->oss.oss) {
 399                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 400                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 401                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 402                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 403                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 404                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 405         }
 406 #endif
 407  unlock:
 408         mutex_unlock(&substream->pcm->open_mutex);
 409 }
 410
 411 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 412                                                   struct snd_info_buffer *buffer)
 413 {
 414         struct snd_pcm_substream *substream = entry->private_data;
 415         struct snd_pcm_runtime *runtime;
 416
 417         mutex_lock(&substream->pcm->open_mutex);
 418         runtime = substream->runtime;
 419         if (!runtime) {
 420                 snd_iprintf(buffer, "closed\n");
 421                 goto unlock;
 422         }
 423         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 424                 snd_iprintf(buffer, "no setup\n");
 425                 goto unlock;
 426         }
 427         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 428         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 429         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 430         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 431         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 432         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 433         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 434         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 435  unlock:
 436         mutex_unlock(&substream->pcm->open_mutex);
 437 }
 438
 439 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 440                                                struct snd_info_buffer *buffer)
 441 {
 442         struct snd_pcm_substream *substream = entry->private_data;
 443         struct snd_pcm_runtime *runtime;
 444         struct snd_pcm_status status;
 445         int err;
 446
 447         mutex_lock(&substream->pcm->open_mutex);
 448         runtime = substream->runtime;
 449         if (!runtime) {
 450                 snd_iprintf(buffer, "closed\n");
 451                 goto unlock;
 452         }
 453         memset(&status, 0, sizeof(status));
 454         err = snd_pcm_status(substream, &status);
 455         if (err < 0) {
 456                 snd_iprintf(buffer, "error %d\n", err);
 457                 goto unlock;
 458         }
 459         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 460         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
 461         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 462                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 463         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 464                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 465         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 466         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 467         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 468         snd_iprintf(buffer, "-----\n");
 469         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 470         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 471  unlock:
 472         mutex_unlock(&substream->pcm->open_mutex);
 473 }
 474
 475 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 476 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 477                                     struct snd_info_buffer *buffer)
 478 {
 479         struct snd_pcm_str *pstr = entry->private_data;
 480         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 481 }
 482
 483 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 484                                      struct snd_info_buffer *buffer)
 485 {
 486         struct snd_pcm_str *pstr = entry->private_data;
 487         char line[64];
 488         if (!snd_info_get_line(buffer, line, sizeof(line)))
 489                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 490 }
 491 #endif
 492
 493 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 494 {
 495         struct snd_pcm *pcm = pstr->pcm;
 496         struct snd_info_entry *entry;
 497         char name[16];
 498
 499         sprintf(name, "pcm%i%c", pcm->device,
 500                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 501         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 502                 return -ENOMEM;
 503         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 504         if (snd_info_register(entry) < 0) {
 505                 snd_info_free_entry(entry);
 506                 return -ENOMEM;
 507         }
 508         pstr->proc_root = entry;
 509
 510         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 511                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 512                 if (snd_info_register(entry) < 0) {
 513                         snd_info_free_entry(entry);
 514                         entry = NULL;
 515                 }
 516         }
 517         pstr->proc_info_entry = entry;
 518
 519 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 520         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 521                                                 pstr->proc_root)) != NULL) {
 522                 entry->c.text.read = snd_pcm_xrun_debug_read;
 523                 entry->c.text.write = snd_pcm_xrun_debug_write;
 524                 entry->mode |= S_IWUSR;
 525                 entry->private_data = pstr;
 526                 if (snd_info_register(entry) < 0) {
 527                         snd_info_free_entry(entry);
 528                         entry = NULL;
 529                 }
 530         }
 531         pstr->proc_xrun_debug_entry = entry;
 532 #endif
 533         return 0;
 534 }
 535
 536 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 537 {
 538 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 539         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 540         pstr->proc_xrun_debug_entry = NULL;
 541 #endif
 542         snd_info_free_entry(pstr->proc_info_entry);
 543         pstr->proc_info_entry = NULL;
 544         snd_info_free_entry(pstr->proc_root);
 545         pstr->proc_root = NULL;
 546         return 0;
 547 }
 548
 549 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 550 {
 551         struct snd_info_entry *entry;
 552         struct snd_card *card;
 553         char name[16];
 554
 555         card = substream->pcm->card;
 556
 557         sprintf(name, "sub%i", substream->number);
 558         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 559                 return -ENOMEM;
 560         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 561         if (snd_info_register(entry) < 0) {
 562                 snd_info_free_entry(entry);
 563                 return -ENOMEM;
 564         }
 565         substream->proc_root = entry;
 566
 567         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 568                 snd_info_set_text_ops(entry, substream,
 569                                       snd_pcm_substream_proc_info_read);
 570                 if (snd_info_register(entry) < 0) {
 571                         snd_info_free_entry(entry);
 572                         entry = NULL;
 573                 }
 574         }
 575         substream->proc_info_entry = entry;
 576
 577         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 578                 snd_info_set_text_ops(entry, substream,
 579                                       snd_pcm_substream_proc_hw_params_read);
 580                 if (snd_info_register(entry) < 0) {
 581                         snd_info_free_entry(entry);
 582                         entry = NULL;
 583                 }
 584         }
 585         substream->proc_hw_params_entry = entry;
 586
 587         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 588                 snd_info_set_text_ops(entry, substream,
 589                                       snd_pcm_substream_proc_sw_params_read);
 590                 if (snd_info_register(entry) < 0) {
 591                         snd_info_free_entry(entry);
 592                         entry = NULL;
 593                 }
 594         }
 595         substream->proc_sw_params_entry = entry;
 596
 597         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 598                 snd_info_set_text_ops(entry, substream,
 599                                       snd_pcm_substream_proc_status_read);
 600                 if (snd_info_register(entry) < 0) {
 601                         snd_info_free_entry(entry);
 602                         entry = NULL;
 603                 }
 604         }
 605         substream->proc_status_entry = entry;
 606
 607         return 0;
 608 }
 609
 610 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 611 {
 612         snd_info_free_entry(substream->proc_info_entry);
 613         substream->proc_info_entry = NULL;
 614         snd_info_free_entry(substream->proc_hw_params_entry);
 615         substream->proc_hw_params_entry = NULL;
 616         snd_info_free_entry(substream->proc_sw_params_entry);
 617         substream->proc_sw_params_entry = NULL;
 618         snd_info_free_entry(substream->proc_status_entry);
 619         substream->proc_status_entry = NULL;
 620         snd_info_free_entry(substream->proc_root);
 621         substream->proc_root = NULL;
 622         return 0;
 623 }
 624 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 625 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 626 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 627 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 628 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 629 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 630
 631 /**
 632  * snd_pcm_new_stream - create a new PCM stream
 633  * @pcm: the pcm instance
 634  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 635  * @substream_count: the number of substreams
 636  *
 637  * Creates a new stream for the pcm.
 638  * The corresponding stream on the pcm must have been empty before
 639  * calling this, i.e. zero must be given to the argument of
 640  * snd_pcm_new().
 641  *
 642  * Return: Zero if successful, or a negative error code on failure.
 643  */
 644 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 645 {
 646         int idx, err;
 647         struct snd_pcm_str *pstr = &pcm->streams[stream];
 648         struct snd_pcm_substream *substream, *prev;
 649
 650 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 651         mutex_init(&pstr->oss.setup_mutex);
 652 #endif
 653         pstr->stream = stream;
 654         pstr->pcm = pcm;
 655         pstr->substream_count = substream_count;
 656         if (substream_count > 0 && !pcm->internal) {
 657                 err = snd_pcm_stream_proc_init(pstr);
 658                 if (err < 0) {
 659                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 660                         return err;
 661                 }
 662         }
 663         prev = NULL;
 664         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 665                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 666                 if (substream == NULL) {
 667                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 668                         return -ENOMEM;
 669                 }
 670                 substream->pcm = pcm;
 671                 substream->pstr = pstr;
 672                 substream->number = idx;
 673                 substream->stream = stream;
 674                 sprintf(substream->name, "subdevice #%i", idx);
 675                 substream->buffer_bytes_max = UINT_MAX;
 676                 if (prev == NULL)
 677                         pstr->substream = substream;
 678                 else
 679                         prev->next = substream;
 680
 681                 if (!pcm->internal) {
 682                         err = snd_pcm_substream_proc_init(substream);
 683                         if (err < 0) {
 684                                 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 685                                 if (prev == NULL)
 686                                         pstr->substream = NULL;
 687                                 else
 688                                         prev->next = NULL;
 689                                 kfree(substream);
 690                                 return err;
 691                         }
 692                 }
 693                 substream->group = &substream->self_group;
 694                 spin_lock_init(&substream->self_group.lock);
 695                 INIT_LIST_HEAD(&substream->self_group.substreams);
 696                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 697                 atomic_set(&substream->mmap_count, 0);
 698                 prev = substream;
 699         }
 700         return 0;
 701 }
 702
 703 EXPORT_SYMBOL(snd_pcm_new_stream);
 704
 705 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
 706                 int playback_count, int capture_count, bool internal,
 707                 struct snd_pcm **rpcm)
 708 {
 709         struct snd_pcm *pcm;
 710         int err;
 711         static struct snd_device_ops ops = {
 712                 .dev_free = snd_pcm_dev_free,
 713                 .dev_register = snd_pcm_dev_register,
 714                 .dev_disconnect = snd_pcm_dev_disconnect,
 715         };
 716
 717         if (snd_BUG_ON(!card))
 718                 return -ENXIO;
 719         if (rpcm)
 720                 *rpcm = NULL;
 721         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 722         if (pcm == NULL) {
 723                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 724                 return -ENOMEM;
 725         }
 726         pcm->card = card;
 727         pcm->device = device;
 728         pcm->internal = internal;
 729         if (id)
 730                 strlcpy(pcm->id, id, sizeof(pcm->id));
 731         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 732                 snd_pcm_free(pcm);
 733                 return err;
 734         }
 735         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 736                 snd_pcm_free(pcm);
 737                 return err;
 738         }
 739         mutex_init(&pcm->open_mutex);
 740         init_waitqueue_head(&pcm->open_wait);
 741         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 742                 snd_pcm_free(pcm);
 743                 return err;
 744         }
 745         if (rpcm)
 746                 *rpcm = pcm;
 747         return 0;
 748 }
 749
 750 /**
 751  * snd_pcm_new - create a new PCM instance
 752  * @card: the card instance
 753  * @id: the id string
 754  * @device: the device index (zero based)
 755  * @playback_count: the number of substreams for playback
 756  * @capture_count: the number of substreams for capture
 757  * @rpcm: the pointer to store the new pcm instance
 758  *
 759  * Creates a new PCM instance.
 760  *
 761  * The pcm operators have to be set afterwards to the new instance
 762  * via snd_pcm_set_ops().
 763  *
 764  * Return: Zero if successful, or a negative error code on failure.
 765  */
 766 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 767                 int playback_count, int capture_count, struct snd_pcm **rpcm)
 768 {
 769         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 770                         false, rpcm);
 771 }
 772 EXPORT_SYMBOL(snd_pcm_new);
 773
 774 /**
 775  * snd_pcm_new_internal - create a new internal PCM instance
 776  * @card: the card instance
 777  * @id: the id string
 778  * @device: the device index (zero based - shared with normal PCMs)
 779  * @playback_count: the number of substreams for playback
 780  * @capture_count: the number of substreams for capture
 781  * @rpcm: the pointer to store the new pcm instance
 782  *
 783  * Creates a new internal PCM instance with no userspace device or procfs
 784  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
 785  * will only be used internally by kernel drivers. i.e. it cannot be opened
 786  * by userspace. It provides existing ASoC components drivers with a substream
 787  * and access to any private data.
 788  *
 789  * The pcm operators have to be set afterwards to the new instance
 790  * via snd_pcm_set_ops().
 791  *
 792  * Return: Zero if successful, or a negative error code on failure.
 793  */
 794 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 795         int playback_count, int capture_count,
 796         struct snd_pcm **rpcm)
 797 {
 798         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 799                         true, rpcm);
 800 }
 801 EXPORT_SYMBOL(snd_pcm_new_internal);
 802
 803 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 804 {
 805         struct snd_pcm_substream *substream, *substream_next;
 806 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 807         struct snd_pcm_oss_setup *setup, *setupn;
 808 #endif
 809         substream = pstr->substream;
 810         while (substream) {
 811                 substream_next = substream->next;
 812                 snd_pcm_timer_done(substream);
 813                 snd_pcm_substream_proc_done(substream);
 814                 kfree(substream);
 815                 substream = substream_next;
 816         }
 817         snd_pcm_stream_proc_done(pstr);
 818 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 819         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 820                 setupn = setup->next;
 821                 kfree(setup->task_name);
 822                 kfree(setup);
 823         }
 824 #endif
 825 }
 826
 827 static int snd_pcm_free(struct snd_pcm *pcm)
 828 {
 829         struct snd_pcm_notify *notify;
 830
 831         if (!pcm)
 832                 return 0;
 833         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 834                 notify->n_unregister(pcm);
 835         }
 836         if (pcm->private_free)
 837                 pcm->private_free(pcm);
 838         snd_pcm_lib_preallocate_free_for_all(pcm);
 839         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 840         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 841         kfree(pcm);
 842         return 0;
 843 }
 844
 845 static int snd_pcm_dev_free(struct snd_device *device)
 846 {
 847         struct snd_pcm *pcm = device->device_data;
 848         return snd_pcm_free(pcm);
 849 }
 850
 851 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 852                              struct file *file,
 853                              struct snd_pcm_substream **rsubstream)
 854 {
 855         struct snd_pcm_str * pstr;
 856         struct snd_pcm_substream *substream;
 857         struct snd_pcm_runtime *runtime;
 858         struct snd_ctl_file *kctl;
 859         struct snd_card *card;
 860         int prefer_subdevice = -1;
 861         size_t size;
 862
 863         if (snd_BUG_ON(!pcm || !rsubstream))
 864                 return -ENXIO;
 865         *rsubstream = NULL;
 866         pstr = &pcm->streams[stream];
 867         if (pstr->substream == NULL || pstr->substream_count == 0)
 868                 return -ENODEV;
 869
 870         card = pcm->card;
 871         read_lock(&card->ctl_files_rwlock);
 872         list_for_each_entry(kctl, &card->ctl_files, list) {
 873                 if (kctl->pid == task_pid(current)) {
 874                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 875                         if (prefer_subdevice != -1)
 876                                 break;
 877                 }
 878         }
 879         read_unlock(&card->ctl_files_rwlock);
 880
 881         switch (stream) {
 882         case SNDRV_PCM_STREAM_PLAYBACK:
 883                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 884                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 885                                 if (SUBSTREAM_BUSY(substream))
 886                                         return -EAGAIN;
 887                         }
 888                 }
 889                 break;
 890         case SNDRV_PCM_STREAM_CAPTURE:
 891                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 892                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 893                                 if (SUBSTREAM_BUSY(substream))
 894                                         return -EAGAIN;
 895                         }
 896                 }
 897                 break;
 898         default:
 899                 return -EINVAL;
 900         }
 901
 902         if (file->f_flags & O_APPEND) {
 903                 if (prefer_subdevice < 0) {
 904                         if (pstr->substream_count > 1)
 905                                 return -EINVAL; /* must be unique */
 906                         substream = pstr->substream;
 907                 } else {
 908                         for (substream = pstr->substream; substream;
 909                              substream = substream->next)
 910                                 if (substream->number == prefer_subdevice)
 911                                         break;
 912                 }
 913                 if (! substream)
 914                         return -ENODEV;
 915                 if (! SUBSTREAM_BUSY(substream))
 916                         return -EBADFD;
 917                 substream->ref_count++;
 918                 *rsubstream = substream;
 919                 return 0;
 920         }
 921
 922         if (prefer_subdevice >= 0) {
 923                 for (substream = pstr->substream; substream; substream = substream->next)
 924                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 925                                 goto __ok;
 926         }
 927         for (substream = pstr->substream; substream; substream = substream->next)
 928                 if (!SUBSTREAM_BUSY(substream))
 929                         break;
 930       __ok:
 931         if (substream == NULL)
 932                 return -EAGAIN;
 933
 934         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 935         if (runtime == NULL)
 936                 return -ENOMEM;
 937
 938         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 939         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 940         if (runtime->status == NULL) {
 941                 kfree(runtime);
 942                 return -ENOMEM;
 943         }
 944         memset((void*)runtime->status, 0, size);
 945
 946         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 947         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 948         if (runtime->control == NULL) {
 949                 snd_free_pages((void*)runtime->status,
 950                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 951                 kfree(runtime);
 952                 return -ENOMEM;
 953         }
 954         memset((void*)runtime->control, 0, size);
 955
 956         init_waitqueue_head(&runtime->sleep);
 957         init_waitqueue_head(&runtime->tsleep);
 958
 959         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 960
 961         substream->runtime = runtime;
 962         substream->private_data = pcm->private_data;
 963         substream->ref_count = 1;
 964         substream->f_flags = file->f_flags;
 965         substream->pid = get_pid(task_pid(current));
 966         pstr->substream_opened++;
 967         *rsubstream = substream;
 968         return 0;
 969 }
 970
 971 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 972 {
 973         struct snd_pcm_runtime *runtime;
 974
 975         if (PCM_RUNTIME_CHECK(substream))
 976                 return;
 977         runtime = substream->runtime;
 978         if (runtime->private_free != NULL)
 979                 runtime->private_free(runtime);
 980         snd_free_pages((void*)runtime->status,
 981                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 982         snd_free_pages((void*)runtime->control,
 983                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 984         kfree(runtime->hw_constraints.rules);
 985 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 986         kfree(runtime->hwptr_log);
 987 #endif
 988         kfree(runtime);
 989         substream->runtime = NULL;
 990         put_pid(substream->pid);
 991         substream->pid = NULL;
 992         substream->pstr->substream_opened--;
 993 }
 994
 995 static ssize_t show_pcm_class(struct device *dev,
 996                               struct device_attribute *attr, char *buf)
 997 {
 998         struct snd_pcm *pcm;
 999         const char *str;
1000         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1001                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1002                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1003                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1004                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1005         };
1006
1007         if (! (pcm = dev_get_drvdata(dev)) ||
1008             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1009                 str = "none";
1010         else
1011                 str = strs[pcm->dev_class];
1012         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1013 }
1014
1015 static struct device_attribute pcm_attrs =
1016         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1017
1018 static int snd_pcm_dev_register(struct snd_device *device)
1019 {
1020         int cidx, err;
1021         struct snd_pcm_substream *substream;
1022         struct snd_pcm_notify *notify;
1023         char str[16];
1024         struct snd_pcm *pcm;
1025         struct device *dev;
1026
1027         if (snd_BUG_ON(!device || !device->device_data))
1028                 return -ENXIO;
1029         pcm = device->device_data;
1030         mutex_lock(&register_mutex);
1031         err = snd_pcm_add(pcm);
1032         if (err) {
1033                 mutex_unlock(&register_mutex);
1034                 return err;
1035         }
1036         for (cidx = 0; cidx < 2; cidx++) {
1037                 int devtype = -1;
1038                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1039                         continue;
1040                 switch (cidx) {
1041                 case SNDRV_PCM_STREAM_PLAYBACK:
1042                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1043                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1044                         break;
1045                 case SNDRV_PCM_STREAM_CAPTURE:
1046                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1047                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1048                         break;
1049                 }
1050                 /* device pointer to use, pcm->dev takes precedence if
1051                  * it is assigned, otherwise fall back to card's device
1052                  * if possible */
1053                 dev = pcm->dev;
1054                 if (!dev)
1055                         dev = snd_card_get_device_link(pcm->card);
1056                 /* register pcm */
1057                 err = snd_register_device_for_dev(devtype, pcm->card,
1058                                                   pcm->device,
1059                                                   &snd_pcm_f_ops[cidx],
1060                                                   pcm, str, dev);
1061                 if (err < 0) {
1062                         list_del(&pcm->list);
1063                         mutex_unlock(&register_mutex);
1064                         return err;
1065                 }
1066                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1067                                           &pcm_attrs);
1068                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1069                         snd_pcm_timer_init(substream);
1070         }
1071
1072         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1073                 notify->n_register(pcm);
1074
1075         mutex_unlock(&register_mutex);
1076         return 0;
1077 }
1078
1079 static int snd_pcm_dev_disconnect(struct snd_device *device)
1080 {
1081         struct snd_pcm *pcm = device->device_data;
1082         struct snd_pcm_notify *notify;
1083         struct snd_pcm_substream *substream;
1084         int cidx, devtype;
1085
1086         mutex_lock(&register_mutex);
1087         if (list_empty(&pcm->list))
1088                 goto unlock;
1089
1090         mutex_lock(&pcm->open_mutex);
1091         wake_up(&pcm->open_wait);
1092         list_del_init(&pcm->list);
1093         for (cidx = 0; cidx < 2; cidx++)
1094                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1095                         snd_pcm_stream_lock_irq(substream);
1096                         if (substream->runtime) {
1097                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1098                                 wake_up(&substream->runtime->sleep);
1099                                 wake_up(&substream->runtime->tsleep);
1100                         }
1101                         snd_pcm_stream_unlock_irq(substream);
1102                 }
1103         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1104                 notify->n_disconnect(pcm);
1105         }
1106         for (cidx = 0; cidx < 2; cidx++) {
1107                 devtype = -1;
1108                 switch (cidx) {
1109                 case SNDRV_PCM_STREAM_PLAYBACK:
1110                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1111                         break;
1112                 case SNDRV_PCM_STREAM_CAPTURE:
1113                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1114                         break;
1115                 }
1116                 snd_unregister_device(devtype, pcm->card, pcm->device);
1117                 if (pcm->streams[cidx].chmap_kctl) {
1118                         snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1119                         pcm->streams[cidx].chmap_kctl = NULL;
1120                 }
1121         }
1122         mutex_unlock(&pcm->open_mutex);
1123  unlock:
1124         mutex_unlock(&register_mutex);
1125         return 0;
1126 }
1127
1128 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1129 {
1130         struct snd_pcm *pcm;
1131
1132         if (snd_BUG_ON(!notify ||
1133                        !notify->n_register ||
1134                        !notify->n_unregister ||
1135                        !notify->n_disconnect))
1136                 return -EINVAL;
1137         mutex_lock(&register_mutex);
1138         if (nfree) {
1139                 list_del(&notify->list);
1140                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1141                         notify->n_unregister(pcm);
1142         } else {
1143                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1144                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1145                         notify->n_register(pcm);
1146         }
1147         mutex_unlock(&register_mutex);
1148         return 0;
1149 }
1150
1151 EXPORT_SYMBOL(snd_pcm_notify);
1152
1153 #ifdef CONFIG_PROC_FS
1154 /*
1155  *  Info interface
1156  */
1157
1158 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1159                               struct snd_info_buffer *buffer)
1160 {
1161         struct snd_pcm *pcm;
1162
1163         mutex_lock(&register_mutex);
1164         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1165                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1166                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1167                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1168                         snd_iprintf(buffer, " : playback %i",
1169                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1170                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1171                         snd_iprintf(buffer, " : capture %i",
1172                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1173                 snd_iprintf(buffer, "\n");
1174         }
1175         mutex_unlock(&register_mutex);
1176 }
1177
1178 static struct snd_info_entry *snd_pcm_proc_entry;
1179
1180 static void snd_pcm_proc_init(void)
1181 {
1182         struct snd_info_entry *entry;
1183
1184         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1185                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1186                 if (snd_info_register(entry) < 0) {
1187                         snd_info_free_entry(entry);
1188                         entry = NULL;
1189                 }
1190         }
1191         snd_pcm_proc_entry = entry;
1192 }
1193
1194 static void snd_pcm_proc_done(void)
1195 {
1196         snd_info_free_entry(snd_pcm_proc_entry);
1197 }
1198
1199 #else /* !CONFIG_PROC_FS */
1200 #define snd_pcm_proc_init()
1201 #define snd_pcm_proc_done()
1202 #endif /* CONFIG_PROC_FS */
1203
1204
1205 /*
1206  *  ENTRY functions
1207  */
1208
1209 static int __init alsa_pcm_init(void)
1210 {
1211         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1212         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1213         snd_pcm_proc_init();
1214         return 0;
1215 }
1216
1217 static void __exit alsa_pcm_exit(void)
1218 {
1219         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1220         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1221         snd_pcm_proc_done();
1222 }
1223
1224 module_init(alsa_pcm_init)
1225 module_exit(alsa_pcm_exit)