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->internal)
  53                         continue;
  54                 if (pcm->card == card && pcm->device == device)
  55                         return pcm;
  56         }
  57         return NULL;
  58 }
  59
  60 static int snd_pcm_next(struct snd_card *card, int device)
  61 {
  62         struct snd_pcm *pcm;
  63
  64         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  65                 if (pcm->internal)
  66                         continue;
  67                 if (pcm->card == card && pcm->device > device)
  68                         return pcm->device;
  69                 else if (pcm->card->number > card->number)
  70                         return -1;
  71         }
  72         return -1;
  73 }
  74
  75 static int snd_pcm_add(struct snd_pcm *newpcm)
  76 {
  77         struct snd_pcm *pcm;
  78
  79         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  80                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
  81                         return -EBUSY;
  82                 if (pcm->card->number > newpcm->card->number ||
  83                                 (pcm->card == newpcm->card &&
  84                                 pcm->device > newpcm->device)) {
  85                         list_add(&newpcm->list, pcm->list.prev);
  86                         return 0;
  87                 }
  88         }
  89         list_add_tail(&newpcm->list, &snd_pcm_devices);
  90         return 0;
  91 }
  92
  93 static int snd_pcm_control_ioctl(struct snd_card *card,
  94                                  struct snd_ctl_file *control,
  95                                  unsigned int cmd, unsigned long arg)
  96 {
  97         switch (cmd) {
  98         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  99                 {
 100                         int device;
 101
 102                         if (get_user(device, (int __user *)arg))
 103                                 return -EFAULT;
 104                         mutex_lock(&register_mutex);
 105                         device = snd_pcm_next(card, device);
 106                         mutex_unlock(&register_mutex);
 107                         if (put_user(device, (int __user *)arg))
 108                                 return -EFAULT;
 109                         return 0;
 110                 }
 111         case SNDRV_CTL_IOCTL_PCM_INFO:
 112                 {
 113                         struct snd_pcm_info __user *info;
 114                         unsigned int device, subdevice;
 115                         int stream;
 116                         struct snd_pcm *pcm;
 117                         struct snd_pcm_str *pstr;
 118                         struct snd_pcm_substream *substream;
 119                         int err;
 120
 121                         info = (struct snd_pcm_info __user *)arg;
 122                         if (get_user(device, &info->device))
 123                                 return -EFAULT;
 124                         if (get_user(stream, &info->stream))
 125                                 return -EFAULT;
 126                         if (stream < 0 || stream > 1)
 127                                 return -EINVAL;
 128                         if (get_user(subdevice, &info->subdevice))
 129                                 return -EFAULT;
 130                         mutex_lock(&register_mutex);
 131                         pcm = snd_pcm_get(card, device);
 132                         if (pcm == NULL) {
 133                                 err = -ENXIO;
 134                                 goto _error;
 135                         }
 136                         pstr = &pcm->streams[stream];
 137                         if (pstr->substream_count == 0) {
 138                                 err = -ENOENT;
 139                                 goto _error;
 140                         }
 141                         if (subdevice >= pstr->substream_count) {
 142                                 err = -ENXIO;
 143                                 goto _error;
 144                         }
 145                         for (substream = pstr->substream; substream;
 146                              substream = substream->next)
 147                                 if (substream->number == (int)subdevice)
 148                                         break;
 149                         if (substream == NULL) {
 150                                 err = -ENXIO;
 151                                 goto _error;
 152                         }
 153                         err = snd_pcm_info_user(substream, info);
 154                 _error:
 155                         mutex_unlock(&register_mutex);
 156                         return err;
 157                 }
 158         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 159                 {
 160                         int val;
 161
 162                         if (get_user(val, (int __user *)arg))
 163                                 return -EFAULT;
 164                         control->prefer_pcm_subdevice = val;
 165                         return 0;
 166                 }
 167         }
 168         return -ENOIOCTLCMD;
 169 }
 170
 171 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 172
 173 static char *snd_pcm_format_names[] = {
 174         FORMAT(S8),
 175         FORMAT(U8),
 176         FORMAT(S16_LE),
 177         FORMAT(S16_BE),
 178         FORMAT(U16_LE),
 179         FORMAT(U16_BE),
 180         FORMAT(S24_LE),
 181         FORMAT(S24_BE),
 182         FORMAT(U24_LE),
 183         FORMAT(U24_BE),
 184         FORMAT(S32_LE),
 185         FORMAT(S32_BE),
 186         FORMAT(U32_LE),
 187         FORMAT(U32_BE),
 188         FORMAT(FLOAT_LE),
 189         FORMAT(FLOAT_BE),
 190         FORMAT(FLOAT64_LE),
 191         FORMAT(FLOAT64_BE),
 192         FORMAT(IEC958_SUBFRAME_LE),
 193         FORMAT(IEC958_SUBFRAME_BE),
 194         FORMAT(MU_LAW),
 195         FORMAT(A_LAW),
 196         FORMAT(IMA_ADPCM),
 197         FORMAT(MPEG),
 198         FORMAT(GSM),
 199         FORMAT(SPECIAL),
 200         FORMAT(S24_3LE),
 201         FORMAT(S24_3BE),
 202         FORMAT(U24_3LE),
 203         FORMAT(U24_3BE),
 204         FORMAT(S20_3LE),
 205         FORMAT(S20_3BE),
 206         FORMAT(U20_3LE),
 207         FORMAT(U20_3BE),
 208         FORMAT(S18_3LE),
 209         FORMAT(S18_3BE),
 210         FORMAT(U18_3LE),
 211         FORMAT(U18_3BE),
 212         FORMAT(G723_24),
 213         FORMAT(G723_24_1B),
 214         FORMAT(G723_40),
 215         FORMAT(G723_40_1B),
 216         FORMAT(DSD_U8),
 217         FORMAT(DSD_U16_LE),
 218 };
 219
 220 const char *snd_pcm_format_name(snd_pcm_format_t format)
 221 {
 222         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
 223                 return "Unknown";
 224         return snd_pcm_format_names[(__force unsigned int)format];
 225 }
 226 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
 227
 228 #ifdef CONFIG_SND_VERBOSE_PROCFS
 229
 230 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 231 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 232 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 233 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 234 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 235 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 236 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 237 #define START(v) [SNDRV_PCM_START_##v] = #v
 238 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 239
 240 static char *snd_pcm_stream_names[] = {
 241         STREAM(PLAYBACK),
 242         STREAM(CAPTURE),
 243 };
 244
 245 static char *snd_pcm_state_names[] = {
 246         STATE(OPEN),
 247         STATE(SETUP),
 248         STATE(PREPARED),
 249         STATE(RUNNING),
 250         STATE(XRUN),
 251         STATE(DRAINING),
 252         STATE(PAUSED),
 253         STATE(SUSPENDED),
 254 };
 255
 256 static char *snd_pcm_access_names[] = {
 257         ACCESS(MMAP_INTERLEAVED),
 258         ACCESS(MMAP_NONINTERLEAVED),
 259         ACCESS(MMAP_COMPLEX),
 260         ACCESS(RW_INTERLEAVED),
 261         ACCESS(RW_NONINTERLEAVED),
 262 };
 263
 264 static char *snd_pcm_subformat_names[] = {
 265         SUBFORMAT(STD),
 266 };
 267
 268 static char *snd_pcm_tstamp_mode_names[] = {
 269         TSTAMP(NONE),
 270         TSTAMP(ENABLE),
 271 };
 272
 273 static const char *snd_pcm_stream_name(int stream)
 274 {
 275         return snd_pcm_stream_names[stream];
 276 }
 277
 278 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 279 {
 280         return snd_pcm_access_names[(__force int)access];
 281 }
 282
 283 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 284 {
 285         return snd_pcm_subformat_names[(__force int)subformat];
 286 }
 287
 288 static const char *snd_pcm_tstamp_mode_name(int mode)
 289 {
 290         return snd_pcm_tstamp_mode_names[mode];
 291 }
 292
 293 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 294 {
 295         return snd_pcm_state_names[(__force int)state];
 296 }
 297
 298 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 299 #include <linux/soundcard.h>
 300
 301 static const char *snd_pcm_oss_format_name(int format)
 302 {
 303         switch (format) {
 304         case AFMT_MU_LAW:
 305                 return "MU_LAW";
 306         case AFMT_A_LAW:
 307                 return "A_LAW";
 308         case AFMT_IMA_ADPCM:
 309                 return "IMA_ADPCM";
 310         case AFMT_U8:
 311                 return "U8";
 312         case AFMT_S16_LE:
 313                 return "S16_LE";
 314         case AFMT_S16_BE:
 315                 return "S16_BE";
 316         case AFMT_S8:
 317                 return "S8";
 318         case AFMT_U16_LE:
 319                 return "U16_LE";
 320         case AFMT_U16_BE:
 321                 return "U16_BE";
 322         case AFMT_MPEG:
 323                 return "MPEG";
 324         default:
 325                 return "unknown";
 326         }
 327 }
 328 #endif
 329
 330 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 331                                    struct snd_info_buffer *buffer)
 332 {
 333         struct snd_pcm_info *info;
 334         int err;
 335
 336         if (! substream)
 337                 return;
 338
 339         info = kmalloc(sizeof(*info), GFP_KERNEL);
 340         if (! info) {
 341                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 342                 return;
 343         }
 344
 345         err = snd_pcm_info(substream, info);
 346         if (err < 0) {
 347                 snd_iprintf(buffer, "error %d\n", err);
 348                 kfree(info);
 349                 return;
 350         }
 351         snd_iprintf(buffer, "card: %d\n", info->card);
 352         snd_iprintf(buffer, "device: %d\n", info->device);
 353         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 354         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 355         snd_iprintf(buffer, "id: %s\n", info->id);
 356         snd_iprintf(buffer, "name: %s\n", info->name);
 357         snd_iprintf(buffer, "subname: %s\n", info->subname);
 358         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 359         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 360         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 361         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 362         kfree(info);
 363 }
 364
 365 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 366                                           struct snd_info_buffer *buffer)
 367 {
 368         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 369                                buffer);
 370 }
 371
 372 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 373                                              struct snd_info_buffer *buffer)
 374 {
 375         snd_pcm_proc_info_read(entry->private_data, buffer);
 376 }
 377
 378 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 379                                                   struct snd_info_buffer *buffer)
 380 {
 381         struct snd_pcm_substream *substream = entry->private_data;
 382         struct snd_pcm_runtime *runtime;
 383
 384         mutex_lock(&substream->pcm->open_mutex);
 385         runtime = substream->runtime;
 386         if (!runtime) {
 387                 snd_iprintf(buffer, "closed\n");
 388                 goto unlock;
 389         }
 390         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 391                 snd_iprintf(buffer, "no setup\n");
 392                 goto unlock;
 393         }
 394         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 395         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 396         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 397         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 398         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 399         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 400         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 401 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 402         if (substream->oss.oss) {
 403                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 404                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 405                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 406                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 407                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 408                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 409         }
 410 #endif
 411  unlock:
 412         mutex_unlock(&substream->pcm->open_mutex);
 413 }
 414
 415 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 416                                                   struct snd_info_buffer *buffer)
 417 {
 418         struct snd_pcm_substream *substream = entry->private_data;
 419         struct snd_pcm_runtime *runtime;
 420
 421         mutex_lock(&substream->pcm->open_mutex);
 422         runtime = substream->runtime;
 423         if (!runtime) {
 424                 snd_iprintf(buffer, "closed\n");
 425                 goto unlock;
 426         }
 427         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 428                 snd_iprintf(buffer, "no setup\n");
 429                 goto unlock;
 430         }
 431         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 432         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 433         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 434         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 435         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 436         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 437         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 438         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 439  unlock:
 440         mutex_unlock(&substream->pcm->open_mutex);
 441 }
 442
 443 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 444                                                struct snd_info_buffer *buffer)
 445 {
 446         struct snd_pcm_substream *substream = entry->private_data;
 447         struct snd_pcm_runtime *runtime;
 448         struct snd_pcm_status status;
 449         int err;
 450
 451         mutex_lock(&substream->pcm->open_mutex);
 452         runtime = substream->runtime;
 453         if (!runtime) {
 454                 snd_iprintf(buffer, "closed\n");
 455                 goto unlock;
 456         }
 457         memset(&status, 0, sizeof(status));
 458         err = snd_pcm_status(substream, &status);
 459         if (err < 0) {
 460                 snd_iprintf(buffer, "error %d\n", err);
 461                 goto unlock;
 462         }
 463         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 464         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
 465         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 466                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 467         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 468                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 469         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 470         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 471         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 472         snd_iprintf(buffer, "-----\n");
 473         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 474         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 475  unlock:
 476         mutex_unlock(&substream->pcm->open_mutex);
 477 }
 478
 479 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 480 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 481                                     struct snd_info_buffer *buffer)
 482 {
 483         struct snd_pcm_str *pstr = entry->private_data;
 484         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 485 }
 486
 487 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 488                                      struct snd_info_buffer *buffer)
 489 {
 490         struct snd_pcm_str *pstr = entry->private_data;
 491         char line[64];
 492         if (!snd_info_get_line(buffer, line, sizeof(line)))
 493                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 494 }
 495 #endif
 496
 497 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 498 {
 499         struct snd_pcm *pcm = pstr->pcm;
 500         struct snd_info_entry *entry;
 501         char name[16];
 502
 503         sprintf(name, "pcm%i%c", pcm->device,
 504                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 505         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 506                 return -ENOMEM;
 507         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 508         if (snd_info_register(entry) < 0) {
 509                 snd_info_free_entry(entry);
 510                 return -ENOMEM;
 511         }
 512         pstr->proc_root = entry;
 513
 514         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 515                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 516                 if (snd_info_register(entry) < 0) {
 517                         snd_info_free_entry(entry);
 518                         entry = NULL;
 519                 }
 520         }
 521         pstr->proc_info_entry = entry;
 522
 523 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 524         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 525                                                 pstr->proc_root)) != NULL) {
 526                 entry->c.text.read = snd_pcm_xrun_debug_read;
 527                 entry->c.text.write = snd_pcm_xrun_debug_write;
 528                 entry->mode |= S_IWUSR;
 529                 entry->private_data = pstr;
 530                 if (snd_info_register(entry) < 0) {
 531                         snd_info_free_entry(entry);
 532                         entry = NULL;
 533                 }
 534         }
 535         pstr->proc_xrun_debug_entry = entry;
 536 #endif
 537         return 0;
 538 }
 539
 540 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 541 {
 542 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 543         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 544         pstr->proc_xrun_debug_entry = NULL;
 545 #endif
 546         snd_info_free_entry(pstr->proc_info_entry);
 547         pstr->proc_info_entry = NULL;
 548         snd_info_free_entry(pstr->proc_root);
 549         pstr->proc_root = NULL;
 550         return 0;
 551 }
 552
 553 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 554 {
 555         struct snd_info_entry *entry;
 556         struct snd_card *card;
 557         char name[16];
 558
 559         card = substream->pcm->card;
 560
 561         sprintf(name, "sub%i", substream->number);
 562         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 563                 return -ENOMEM;
 564         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 565         if (snd_info_register(entry) < 0) {
 566                 snd_info_free_entry(entry);
 567                 return -ENOMEM;
 568         }
 569         substream->proc_root = entry;
 570
 571         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 572                 snd_info_set_text_ops(entry, substream,
 573                                       snd_pcm_substream_proc_info_read);
 574                 if (snd_info_register(entry) < 0) {
 575                         snd_info_free_entry(entry);
 576                         entry = NULL;
 577                 }
 578         }
 579         substream->proc_info_entry = entry;
 580
 581         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 582                 snd_info_set_text_ops(entry, substream,
 583                                       snd_pcm_substream_proc_hw_params_read);
 584                 if (snd_info_register(entry) < 0) {
 585                         snd_info_free_entry(entry);
 586                         entry = NULL;
 587                 }
 588         }
 589         substream->proc_hw_params_entry = entry;
 590
 591         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 592                 snd_info_set_text_ops(entry, substream,
 593                                       snd_pcm_substream_proc_sw_params_read);
 594                 if (snd_info_register(entry) < 0) {
 595                         snd_info_free_entry(entry);
 596                         entry = NULL;
 597                 }
 598         }
 599         substream->proc_sw_params_entry = entry;
 600
 601         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 602                 snd_info_set_text_ops(entry, substream,
 603                                       snd_pcm_substream_proc_status_read);
 604                 if (snd_info_register(entry) < 0) {
 605                         snd_info_free_entry(entry);
 606                         entry = NULL;
 607                 }
 608         }
 609         substream->proc_status_entry = entry;
 610
 611         return 0;
 612 }
 613
 614 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 615 {
 616         snd_info_free_entry(substream->proc_info_entry);
 617         substream->proc_info_entry = NULL;
 618         snd_info_free_entry(substream->proc_hw_params_entry);
 619         substream->proc_hw_params_entry = NULL;
 620         snd_info_free_entry(substream->proc_sw_params_entry);
 621         substream->proc_sw_params_entry = NULL;
 622         snd_info_free_entry(substream->proc_status_entry);
 623         substream->proc_status_entry = NULL;
 624         snd_info_free_entry(substream->proc_root);
 625         substream->proc_root = NULL;
 626         return 0;
 627 }
 628 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 629 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 630 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 631 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 632 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 633 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 634
 635 /**
 636  * snd_pcm_new_stream - create a new PCM stream
 637  * @pcm: the pcm instance
 638  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 639  * @substream_count: the number of substreams
 640  *
 641  * Creates a new stream for the pcm.
 642  * The corresponding stream on the pcm must have been empty before
 643  * calling this, i.e. zero must be given to the argument of
 644  * snd_pcm_new().
 645  *
 646  * Return: Zero if successful, or a negative error code on failure.
 647  */
 648 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 649 {
 650         int idx, err;
 651         struct snd_pcm_str *pstr = &pcm->streams[stream];
 652         struct snd_pcm_substream *substream, *prev;
 653
 654 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 655         mutex_init(&pstr->oss.setup_mutex);
 656 #endif
 657         pstr->stream = stream;
 658         pstr->pcm = pcm;
 659         pstr->substream_count = substream_count;
 660         if (substream_count > 0 && !pcm->internal) {
 661                 err = snd_pcm_stream_proc_init(pstr);
 662                 if (err < 0) {
 663                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 664                         return err;
 665                 }
 666         }
 667         prev = NULL;
 668         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 669                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 670                 if (substream == NULL) {
 671                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 672                         return -ENOMEM;
 673                 }
 674                 substream->pcm = pcm;
 675                 substream->pstr = pstr;
 676                 substream->number = idx;
 677                 substream->stream = stream;
 678                 sprintf(substream->name, "subdevice #%i", idx);
 679                 substream->buffer_bytes_max = UINT_MAX;
 680                 if (prev == NULL)
 681                         pstr->substream = substream;
 682                 else
 683                         prev->next = substream;
 684
 685                 if (!pcm->internal) {
 686                         err = snd_pcm_substream_proc_init(substream);
 687                         if (err < 0) {
 688                                 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 689                                 if (prev == NULL)
 690                                         pstr->substream = NULL;
 691                                 else
 692                                         prev->next = NULL;
 693                                 kfree(substream);
 694                                 return err;
 695                         }
 696                 }
 697                 substream->group = &substream->self_group;
 698                 spin_lock_init(&substream->self_group.lock);
 699                 INIT_LIST_HEAD(&substream->self_group.substreams);
 700                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 701                 atomic_set(&substream->mmap_count, 0);
 702                 prev = substream;
 703         }
 704         return 0;
 705 }
 706
 707 EXPORT_SYMBOL(snd_pcm_new_stream);
 708
 709 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
 710                 int playback_count, int capture_count, bool internal,
 711                 struct snd_pcm **rpcm)
 712 {
 713         struct snd_pcm *pcm;
 714         int err;
 715         static struct snd_device_ops ops = {
 716                 .dev_free = snd_pcm_dev_free,
 717                 .dev_register = snd_pcm_dev_register,
 718                 .dev_disconnect = snd_pcm_dev_disconnect,
 719         };
 720
 721         if (snd_BUG_ON(!card))
 722                 return -ENXIO;
 723         if (rpcm)
 724                 *rpcm = NULL;
 725         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 726         if (pcm == NULL) {
 727                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 728                 return -ENOMEM;
 729         }
 730         pcm->card = card;
 731         pcm->device = device;
 732         pcm->internal = internal;
 733         if (id)
 734                 strlcpy(pcm->id, id, sizeof(pcm->id));
 735         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 736                 snd_pcm_free(pcm);
 737                 return err;
 738         }
 739         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 740                 snd_pcm_free(pcm);
 741                 return err;
 742         }
 743         mutex_init(&pcm->open_mutex);
 744         init_waitqueue_head(&pcm->open_wait);
 745         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 746                 snd_pcm_free(pcm);
 747                 return err;
 748         }
 749         if (rpcm)
 750                 *rpcm = pcm;
 751         return 0;
 752 }
 753
 754 /**
 755  * snd_pcm_new - create a new PCM instance
 756  * @card: the card instance
 757  * @id: the id string
 758  * @device: the device index (zero based)
 759  * @playback_count: the number of substreams for playback
 760  * @capture_count: the number of substreams for capture
 761  * @rpcm: the pointer to store the new pcm instance
 762  *
 763  * Creates a new PCM instance.
 764  *
 765  * The pcm operators have to be set afterwards to the new instance
 766  * via snd_pcm_set_ops().
 767  *
 768  * Return: Zero if successful, or a negative error code on failure.
 769  */
 770 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 771                 int playback_count, int capture_count, struct snd_pcm **rpcm)
 772 {
 773         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 774                         false, rpcm);
 775 }
 776 EXPORT_SYMBOL(snd_pcm_new);
 777
 778 /**
 779  * snd_pcm_new_internal - create a new internal PCM instance
 780  * @card: the card instance
 781  * @id: the id string
 782  * @device: the device index (zero based - shared with normal PCMs)
 783  * @playback_count: the number of substreams for playback
 784  * @capture_count: the number of substreams for capture
 785  * @rpcm: the pointer to store the new pcm instance
 786  *
 787  * Creates a new internal PCM instance with no userspace device or procfs
 788  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
 789  * will only be used internally by kernel drivers. i.e. it cannot be opened
 790  * by userspace. It provides existing ASoC components drivers with a substream
 791  * and access to any private data.
 792  *
 793  * The pcm operators have to be set afterwards to the new instance
 794  * via snd_pcm_set_ops().
 795  *
 796  * Return: Zero if successful, or a negative error code on failure.
 797  */
 798 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 799         int playback_count, int capture_count,
 800         struct snd_pcm **rpcm)
 801 {
 802         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 803                         true, rpcm);
 804 }
 805 EXPORT_SYMBOL(snd_pcm_new_internal);
 806
 807 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 808 {
 809         struct snd_pcm_substream *substream, *substream_next;
 810 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 811         struct snd_pcm_oss_setup *setup, *setupn;
 812 #endif
 813         substream = pstr->substream;
 814         while (substream) {
 815                 substream_next = substream->next;
 816                 snd_pcm_timer_done(substream);
 817                 snd_pcm_substream_proc_done(substream);
 818                 kfree(substream);
 819                 substream = substream_next;
 820         }
 821         snd_pcm_stream_proc_done(pstr);
 822 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 823         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 824                 setupn = setup->next;
 825                 kfree(setup->task_name);
 826                 kfree(setup);
 827         }
 828 #endif
 829 }
 830
 831 static int snd_pcm_free(struct snd_pcm *pcm)
 832 {
 833         struct snd_pcm_notify *notify;
 834
 835         if (!pcm)
 836                 return 0;
 837         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 838                 notify->n_unregister(pcm);
 839         }
 840         if (pcm->private_free)
 841                 pcm->private_free(pcm);
 842         snd_pcm_lib_preallocate_free_for_all(pcm);
 843         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 844         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 845         kfree(pcm);
 846         return 0;
 847 }
 848
 849 static int snd_pcm_dev_free(struct snd_device *device)
 850 {
 851         struct snd_pcm *pcm = device->device_data;
 852         return snd_pcm_free(pcm);
 853 }
 854
 855 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 856                              struct file *file,
 857                              struct snd_pcm_substream **rsubstream)
 858 {
 859         struct snd_pcm_str * pstr;
 860         struct snd_pcm_substream *substream;
 861         struct snd_pcm_runtime *runtime;
 862         struct snd_ctl_file *kctl;
 863         struct snd_card *card;
 864         int prefer_subdevice = -1;
 865         size_t size;
 866
 867         if (snd_BUG_ON(!pcm || !rsubstream))
 868                 return -ENXIO;
 869         *rsubstream = NULL;
 870         pstr = &pcm->streams[stream];
 871         if (pstr->substream == NULL || pstr->substream_count == 0)
 872                 return -ENODEV;
 873
 874         card = pcm->card;
 875         read_lock(&card->ctl_files_rwlock);
 876         list_for_each_entry(kctl, &card->ctl_files, list) {
 877                 if (kctl->pid == task_pid(current)) {
 878                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 879                         if (prefer_subdevice != -1)
 880                                 break;
 881                 }
 882         }
 883         read_unlock(&card->ctl_files_rwlock);
 884
 885         switch (stream) {
 886         case SNDRV_PCM_STREAM_PLAYBACK:
 887                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 888                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 889                                 if (SUBSTREAM_BUSY(substream))
 890                                         return -EAGAIN;
 891                         }
 892                 }
 893                 break;
 894         case SNDRV_PCM_STREAM_CAPTURE:
 895                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 896                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 897                                 if (SUBSTREAM_BUSY(substream))
 898                                         return -EAGAIN;
 899                         }
 900                 }
 901                 break;
 902         default:
 903                 return -EINVAL;
 904         }
 905
 906         if (file->f_flags & O_APPEND) {
 907                 if (prefer_subdevice < 0) {
 908                         if (pstr->substream_count > 1)
 909                                 return -EINVAL; /* must be unique */
 910                         substream = pstr->substream;
 911                 } else {
 912                         for (substream = pstr->substream; substream;
 913                              substream = substream->next)
 914                                 if (substream->number == prefer_subdevice)
 915                                         break;
 916                 }
 917                 if (! substream)
 918                         return -ENODEV;
 919                 if (! SUBSTREAM_BUSY(substream))
 920                         return -EBADFD;
 921                 substream->ref_count++;
 922                 *rsubstream = substream;
 923                 return 0;
 924         }
 925
 926         if (prefer_subdevice >= 0) {
 927                 for (substream = pstr->substream; substream; substream = substream->next)
 928                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 929                                 goto __ok;
 930         }
 931         for (substream = pstr->substream; substream; substream = substream->next)
 932                 if (!SUBSTREAM_BUSY(substream))
 933                         break;
 934       __ok:
 935         if (substream == NULL)
 936                 return -EAGAIN;
 937
 938         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 939         if (runtime == NULL)
 940                 return -ENOMEM;
 941
 942         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 943         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 944         if (runtime->status == NULL) {
 945                 kfree(runtime);
 946                 return -ENOMEM;
 947         }
 948         memset((void*)runtime->status, 0, size);
 949
 950         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 951         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 952         if (runtime->control == NULL) {
 953                 snd_free_pages((void*)runtime->status,
 954                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 955                 kfree(runtime);
 956                 return -ENOMEM;
 957         }
 958         memset((void*)runtime->control, 0, size);
 959
 960         init_waitqueue_head(&runtime->sleep);
 961         init_waitqueue_head(&runtime->tsleep);
 962
 963         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 964
 965         substream->runtime = runtime;
 966         substream->private_data = pcm->private_data;
 967         substream->ref_count = 1;
 968         substream->f_flags = file->f_flags;
 969         substream->pid = get_pid(task_pid(current));
 970         pstr->substream_opened++;
 971         *rsubstream = substream;
 972         return 0;
 973 }
 974
 975 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 976 {
 977         struct snd_pcm_runtime *runtime;
 978
 979         if (PCM_RUNTIME_CHECK(substream))
 980                 return;
 981         runtime = substream->runtime;
 982         if (runtime->private_free != NULL)
 983                 runtime->private_free(runtime);
 984         snd_free_pages((void*)runtime->status,
 985                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 986         snd_free_pages((void*)runtime->control,
 987                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 988         kfree(runtime->hw_constraints.rules);
 989 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 990         kfree(runtime->hwptr_log);
 991 #endif
 992         kfree(runtime);
 993         substream->runtime = NULL;
 994         put_pid(substream->pid);
 995         substream->pid = NULL;
 996         substream->pstr->substream_opened--;
 997 }
 998
 999 static ssize_t show_pcm_class(struct device *dev,
1000                               struct device_attribute *attr, char *buf)
1001 {
1002         struct snd_pcm *pcm;
1003         const char *str;
1004         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1005                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1006                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1007                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1008                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1009         };
1010
1011         if (! (pcm = dev_get_drvdata(dev)) ||
1012             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1013                 str = "none";
1014         else
1015                 str = strs[pcm->dev_class];
1016         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1017 }
1018
1019 static struct device_attribute pcm_attrs =
1020         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1021
1022 static int snd_pcm_dev_register(struct snd_device *device)
1023 {
1024         int cidx, err;
1025         struct snd_pcm_substream *substream;
1026         struct snd_pcm_notify *notify;
1027         char str[16];
1028         struct snd_pcm *pcm;
1029         struct device *dev;
1030
1031         if (snd_BUG_ON(!device || !device->device_data))
1032                 return -ENXIO;
1033         pcm = device->device_data;
1034         mutex_lock(&register_mutex);
1035         err = snd_pcm_add(pcm);
1036         if (err) {
1037                 mutex_unlock(&register_mutex);
1038                 return err;
1039         }
1040         for (cidx = 0; cidx < 2; cidx++) {
1041                 int devtype = -1;
1042                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1043                         continue;
1044                 switch (cidx) {
1045                 case SNDRV_PCM_STREAM_PLAYBACK:
1046                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1047                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1048                         break;
1049                 case SNDRV_PCM_STREAM_CAPTURE:
1050                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1051                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1052                         break;
1053                 }
1054                 /* device pointer to use, pcm->dev takes precedence if
1055                  * it is assigned, otherwise fall back to card's device
1056                  * if possible */
1057                 dev = pcm->dev;
1058                 if (!dev)
1059                         dev = snd_card_get_device_link(pcm->card);
1060                 /* register pcm */
1061                 err = snd_register_device_for_dev(devtype, pcm->card,
1062                                                   pcm->device,
1063                                                   &snd_pcm_f_ops[cidx],
1064                                                   pcm, str, dev);
1065                 if (err < 0) {
1066                         list_del(&pcm->list);
1067                         mutex_unlock(&register_mutex);
1068                         return err;
1069                 }
1070                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1071                                           &pcm_attrs);
1072                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1073                         snd_pcm_timer_init(substream);
1074         }
1075
1076         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1077                 notify->n_register(pcm);
1078
1079         mutex_unlock(&register_mutex);
1080         return 0;
1081 }
1082
1083 static int snd_pcm_dev_disconnect(struct snd_device *device)
1084 {
1085         struct snd_pcm *pcm = device->device_data;
1086         struct snd_pcm_notify *notify;
1087         struct snd_pcm_substream *substream;
1088         int cidx, devtype;
1089
1090         mutex_lock(&register_mutex);
1091         if (list_empty(&pcm->list))
1092                 goto unlock;
1093
1094         mutex_lock(&pcm->open_mutex);
1095         wake_up(&pcm->open_wait);
1096         list_del_init(&pcm->list);
1097         for (cidx = 0; cidx < 2; cidx++)
1098                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1099                         snd_pcm_stream_lock_irq(substream);
1100                         if (substream->runtime) {
1101                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1102                                 wake_up(&substream->runtime->sleep);
1103                                 wake_up(&substream->runtime->tsleep);
1104                         }
1105                         snd_pcm_stream_unlock_irq(substream);
1106                 }
1107         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1108                 notify->n_disconnect(pcm);
1109         }
1110         for (cidx = 0; cidx < 2; cidx++) {
1111                 devtype = -1;
1112                 switch (cidx) {
1113                 case SNDRV_PCM_STREAM_PLAYBACK:
1114                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1115                         break;
1116                 case SNDRV_PCM_STREAM_CAPTURE:
1117                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1118                         break;
1119                 }
1120                 snd_unregister_device(devtype, pcm->card, pcm->device);
1121                 if (pcm->streams[cidx].chmap_kctl) {
1122                         snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1123                         pcm->streams[cidx].chmap_kctl = NULL;
1124                 }
1125         }
1126         mutex_unlock(&pcm->open_mutex);
1127  unlock:
1128         mutex_unlock(&register_mutex);
1129         return 0;
1130 }
1131
1132 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1133 {
1134         struct snd_pcm *pcm;
1135
1136         if (snd_BUG_ON(!notify ||
1137                        !notify->n_register ||
1138                        !notify->n_unregister ||
1139                        !notify->n_disconnect))
1140                 return -EINVAL;
1141         mutex_lock(&register_mutex);
1142         if (nfree) {
1143                 list_del(&notify->list);
1144                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1145                         notify->n_unregister(pcm);
1146         } else {
1147                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1148                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1149                         notify->n_register(pcm);
1150         }
1151         mutex_unlock(&register_mutex);
1152         return 0;
1153 }
1154
1155 EXPORT_SYMBOL(snd_pcm_notify);
1156
1157 #ifdef CONFIG_PROC_FS
1158 /*
1159  *  Info interface
1160  */
1161
1162 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1163                               struct snd_info_buffer *buffer)
1164 {
1165         struct snd_pcm *pcm;
1166
1167         mutex_lock(&register_mutex);
1168         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1169                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1170                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1171                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1172                         snd_iprintf(buffer, " : playback %i",
1173                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1174                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1175                         snd_iprintf(buffer, " : capture %i",
1176                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1177                 snd_iprintf(buffer, "\n");
1178         }
1179         mutex_unlock(&register_mutex);
1180 }
1181
1182 static struct snd_info_entry *snd_pcm_proc_entry;
1183
1184 static void snd_pcm_proc_init(void)
1185 {
1186         struct snd_info_entry *entry;
1187
1188         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1189                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1190                 if (snd_info_register(entry) < 0) {
1191                         snd_info_free_entry(entry);
1192                         entry = NULL;
1193                 }
1194         }
1195         snd_pcm_proc_entry = entry;
1196 }
1197
1198 static void snd_pcm_proc_done(void)
1199 {
1200         snd_info_free_entry(snd_pcm_proc_entry);
1201 }
1202
1203 #else /* !CONFIG_PROC_FS */
1204 #define snd_pcm_proc_init()
1205 #define snd_pcm_proc_done()
1206 #endif /* CONFIG_PROC_FS */
1207
1208
1209 /*
1210  *  ENTRY functions
1211  */
1212
1213 static int __init alsa_pcm_init(void)
1214 {
1215         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1216         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1217         snd_pcm_proc_init();
1218         return 0;
1219 }
1220
1221 static void __exit alsa_pcm_exit(void)
1222 {
1223         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1224         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1225         snd_pcm_proc_done();
1226 }
1227
1228 module_init(alsa_pcm_init)
1229 module_exit(alsa_pcm_exit)