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