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 IS_ENABLED(CONFIG_SND_PCM_OSS)
 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                 pcm_dbg(substream->pcm,
 342                         "snd_pcm_proc_info_read: cannot malloc\n");
 343                 return;
 344         }
 345
 346         err = snd_pcm_info(substream, info);
 347         if (err < 0) {
 348                 snd_iprintf(buffer, "error %d\n", err);
 349                 kfree(info);
 350                 return;
 351         }
 352         snd_iprintf(buffer, "card: %d\n", info->card);
 353         snd_iprintf(buffer, "device: %d\n", info->device);
 354         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 355         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 356         snd_iprintf(buffer, "id: %s\n", info->id);
 357         snd_iprintf(buffer, "name: %s\n", info->name);
 358         snd_iprintf(buffer, "subname: %s\n", info->subname);
 359         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 360         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 361         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 362         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 363         kfree(info);
 364 }
 365
 366 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 367                                           struct snd_info_buffer *buffer)
 368 {
 369         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 370                                buffer);
 371 }
 372
 373 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 374                                              struct snd_info_buffer *buffer)
 375 {
 376         snd_pcm_proc_info_read(entry->private_data, buffer);
 377 }
 378
 379 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 380                                                   struct snd_info_buffer *buffer)
 381 {
 382         struct snd_pcm_substream *substream = entry->private_data;
 383         struct snd_pcm_runtime *runtime;
 384
 385         mutex_lock(&substream->pcm->open_mutex);
 386         runtime = substream->runtime;
 387         if (!runtime) {
 388                 snd_iprintf(buffer, "closed\n");
 389                 goto unlock;
 390         }
 391         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 392                 snd_iprintf(buffer, "no setup\n");
 393                 goto unlock;
 394         }
 395         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 396         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 397         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 398         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 399         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 400         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 401         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 402 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 403         if (substream->oss.oss) {
 404                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 405                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 406                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 407                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 408                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 409                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 410         }
 411 #endif
 412  unlock:
 413         mutex_unlock(&substream->pcm->open_mutex);
 414 }
 415
 416 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 417                                                   struct snd_info_buffer *buffer)
 418 {
 419         struct snd_pcm_substream *substream = entry->private_data;
 420         struct snd_pcm_runtime *runtime;
 421
 422         mutex_lock(&substream->pcm->open_mutex);
 423         runtime = substream->runtime;
 424         if (!runtime) {
 425                 snd_iprintf(buffer, "closed\n");
 426                 goto unlock;
 427         }
 428         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 429                 snd_iprintf(buffer, "no setup\n");
 430                 goto unlock;
 431         }
 432         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 433         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 434         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 435         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 436         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 437         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 438         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 439         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 440  unlock:
 441         mutex_unlock(&substream->pcm->open_mutex);
 442 }
 443
 444 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 445                                                struct snd_info_buffer *buffer)
 446 {
 447         struct snd_pcm_substream *substream = entry->private_data;
 448         struct snd_pcm_runtime *runtime;
 449         struct snd_pcm_status status;
 450         int err;
 451
 452         mutex_lock(&substream->pcm->open_mutex);
 453         runtime = substream->runtime;
 454         if (!runtime) {
 455                 snd_iprintf(buffer, "closed\n");
 456                 goto unlock;
 457         }
 458         memset(&status, 0, sizeof(status));
 459         err = snd_pcm_status(substream, &status);
 460         if (err < 0) {
 461                 snd_iprintf(buffer, "error %d\n", err);
 462                 goto unlock;
 463         }
 464         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 465         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
 466         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 467                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 468         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 469                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 470         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 471         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 472         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 473         snd_iprintf(buffer, "-----\n");
 474         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 475         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 476  unlock:
 477         mutex_unlock(&substream->pcm->open_mutex);
 478 }
 479
 480 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 481 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 482                                     struct snd_info_buffer *buffer)
 483 {
 484         struct snd_pcm_str *pstr = entry->private_data;
 485         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 486 }
 487
 488 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 489                                      struct snd_info_buffer *buffer)
 490 {
 491         struct snd_pcm_str *pstr = entry->private_data;
 492         char line[64];
 493         if (!snd_info_get_line(buffer, line, sizeof(line)))
 494                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 495 }
 496 #endif
 497
 498 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 499 {
 500         struct snd_pcm *pcm = pstr->pcm;
 501         struct snd_info_entry *entry;
 502         char name[16];
 503
 504         sprintf(name, "pcm%i%c", pcm->device,
 505                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 506         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 507                 return -ENOMEM;
 508         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 509         if (snd_info_register(entry) < 0) {
 510                 snd_info_free_entry(entry);
 511                 return -ENOMEM;
 512         }
 513         pstr->proc_root = entry;
 514
 515         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 516                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 517                 if (snd_info_register(entry) < 0) {
 518                         snd_info_free_entry(entry);
 519                         entry = NULL;
 520                 }
 521         }
 522         pstr->proc_info_entry = entry;
 523
 524 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 525         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 526                                                 pstr->proc_root)) != NULL) {
 527                 entry->c.text.read = snd_pcm_xrun_debug_read;
 528                 entry->c.text.write = snd_pcm_xrun_debug_write;
 529                 entry->mode |= S_IWUSR;
 530                 entry->private_data = pstr;
 531                 if (snd_info_register(entry) < 0) {
 532                         snd_info_free_entry(entry);
 533                         entry = NULL;
 534                 }
 535         }
 536         pstr->proc_xrun_debug_entry = entry;
 537 #endif
 538         return 0;
 539 }
 540
 541 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 542 {
 543 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 544         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 545         pstr->proc_xrun_debug_entry = NULL;
 546 #endif
 547         snd_info_free_entry(pstr->proc_info_entry);
 548         pstr->proc_info_entry = NULL;
 549         snd_info_free_entry(pstr->proc_root);
 550         pstr->proc_root = NULL;
 551         return 0;
 552 }
 553
 554 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 555 {
 556         struct snd_info_entry *entry;
 557         struct snd_card *card;
 558         char name[16];
 559
 560         card = substream->pcm->card;
 561
 562         sprintf(name, "sub%i", substream->number);
 563         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 564                 return -ENOMEM;
 565         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 566         if (snd_info_register(entry) < 0) {
 567                 snd_info_free_entry(entry);
 568                 return -ENOMEM;
 569         }
 570         substream->proc_root = entry;
 571
 572         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 573                 snd_info_set_text_ops(entry, substream,
 574                                       snd_pcm_substream_proc_info_read);
 575                 if (snd_info_register(entry) < 0) {
 576                         snd_info_free_entry(entry);
 577                         entry = NULL;
 578                 }
 579         }
 580         substream->proc_info_entry = entry;
 581
 582         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 583                 snd_info_set_text_ops(entry, substream,
 584                                       snd_pcm_substream_proc_hw_params_read);
 585                 if (snd_info_register(entry) < 0) {
 586                         snd_info_free_entry(entry);
 587                         entry = NULL;
 588                 }
 589         }
 590         substream->proc_hw_params_entry = entry;
 591
 592         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 593                 snd_info_set_text_ops(entry, substream,
 594                                       snd_pcm_substream_proc_sw_params_read);
 595                 if (snd_info_register(entry) < 0) {
 596                         snd_info_free_entry(entry);
 597                         entry = NULL;
 598                 }
 599         }
 600         substream->proc_sw_params_entry = entry;
 601
 602         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 603                 snd_info_set_text_ops(entry, substream,
 604                                       snd_pcm_substream_proc_status_read);
 605                 if (snd_info_register(entry) < 0) {
 606                         snd_info_free_entry(entry);
 607                         entry = NULL;
 608                 }
 609         }
 610         substream->proc_status_entry = entry;
 611
 612         return 0;
 613 }
 614
 615 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 616 {
 617         snd_info_free_entry(substream->proc_info_entry);
 618         substream->proc_info_entry = NULL;
 619         snd_info_free_entry(substream->proc_hw_params_entry);
 620         substream->proc_hw_params_entry = NULL;
 621         snd_info_free_entry(substream->proc_sw_params_entry);
 622         substream->proc_sw_params_entry = NULL;
 623         snd_info_free_entry(substream->proc_status_entry);
 624         substream->proc_status_entry = NULL;
 625         snd_info_free_entry(substream->proc_root);
 626         substream->proc_root = NULL;
 627         return 0;
 628 }
 629 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 630 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 631 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 632 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 633 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 634 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 635
 636 /**
 637  * snd_pcm_new_stream - create a new PCM stream
 638  * @pcm: the pcm instance
 639  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 640  * @substream_count: the number of substreams
 641  *
 642  * Creates a new stream for the pcm.
 643  * The corresponding stream on the pcm must have been empty before
 644  * calling this, i.e. zero must be given to the argument of
 645  * snd_pcm_new().
 646  *
 647  * Return: Zero if successful, or a negative error code on failure.
 648  */
 649 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 650 {
 651         int idx, err;
 652         struct snd_pcm_str *pstr = &pcm->streams[stream];
 653         struct snd_pcm_substream *substream, *prev;
 654
 655 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 656         mutex_init(&pstr->oss.setup_mutex);
 657 #endif
 658         pstr->stream = stream;
 659         pstr->pcm = pcm;
 660         pstr->substream_count = substream_count;
 661         if (substream_count > 0 && !pcm->internal) {
 662                 err = snd_pcm_stream_proc_init(pstr);
 663                 if (err < 0) {
 664                         pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
 665                         return err;
 666                 }
 667         }
 668         prev = NULL;
 669         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 670                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 671                 if (substream == NULL) {
 672                         pcm_err(pcm, "Cannot allocate PCM substream\n");
 673                         return -ENOMEM;
 674                 }
 675                 substream->pcm = pcm;
 676                 substream->pstr = pstr;
 677                 substream->number = idx;
 678                 substream->stream = stream;
 679                 sprintf(substream->name, "subdevice #%i", idx);
 680                 substream->buffer_bytes_max = UINT_MAX;
 681                 if (prev == NULL)
 682                         pstr->substream = substream;
 683                 else
 684                         prev->next = substream;
 685
 686                 if (!pcm->internal) {
 687                         err = snd_pcm_substream_proc_init(substream);
 688                         if (err < 0) {
 689                                 pcm_err(pcm,
 690                                         "Error in snd_pcm_stream_proc_init\n");
 691                                 if (prev == NULL)
 692                                         pstr->substream = NULL;
 693                                 else
 694                                         prev->next = NULL;
 695                                 kfree(substream);
 696                                 return err;
 697                         }
 698                 }
 699                 substream->group = &substream->self_group;
 700                 spin_lock_init(&substream->self_group.lock);
 701                 INIT_LIST_HEAD(&substream->self_group.substreams);
 702                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 703                 atomic_set(&substream->mmap_count, 0);
 704                 prev = substream;
 705         }
 706         return 0;
 707 }
 708
 709 EXPORT_SYMBOL(snd_pcm_new_stream);
 710
 711 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
 712                 int playback_count, int capture_count, bool internal,
 713                 struct snd_pcm **rpcm)
 714 {
 715         struct snd_pcm *pcm;
 716         int err;
 717         static struct snd_device_ops ops = {
 718                 .dev_free = snd_pcm_dev_free,
 719                 .dev_register = snd_pcm_dev_register,
 720                 .dev_disconnect = snd_pcm_dev_disconnect,
 721         };
 722
 723         if (snd_BUG_ON(!card))
 724                 return -ENXIO;
 725         if (rpcm)
 726                 *rpcm = NULL;
 727         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 728         if (pcm == NULL) {
 729                 dev_err(card->dev, "Cannot allocate PCM\n");
 730                 return -ENOMEM;
 731         }
 732         pcm->card = card;
 733         pcm->device = device;
 734         pcm->internal = internal;
 735         if (id)
 736                 strlcpy(pcm->id, id, sizeof(pcm->id));
 737         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 738                 snd_pcm_free(pcm);
 739                 return err;
 740         }
 741         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 742                 snd_pcm_free(pcm);
 743                 return err;
 744         }
 745         mutex_init(&pcm->open_mutex);
 746         init_waitqueue_head(&pcm->open_wait);
 747         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 748                 snd_pcm_free(pcm);
 749                 return err;
 750         }
 751         if (rpcm)
 752                 *rpcm = pcm;
 753         return 0;
 754 }
 755
 756 /**
 757  * snd_pcm_new - create a new PCM instance
 758  * @card: the card instance
 759  * @id: the id string
 760  * @device: the device index (zero based)
 761  * @playback_count: the number of substreams for playback
 762  * @capture_count: the number of substreams for capture
 763  * @rpcm: the pointer to store the new pcm instance
 764  *
 765  * Creates a new PCM instance.
 766  *
 767  * The pcm operators have to be set afterwards to the new instance
 768  * via snd_pcm_set_ops().
 769  *
 770  * Return: Zero if successful, or a negative error code on failure.
 771  */
 772 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 773                 int playback_count, int capture_count, struct snd_pcm **rpcm)
 774 {
 775         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 776                         false, rpcm);
 777 }
 778 EXPORT_SYMBOL(snd_pcm_new);
 779
 780 /**
 781  * snd_pcm_new_internal - create a new internal PCM instance
 782  * @card: the card instance
 783  * @id: the id string
 784  * @device: the device index (zero based - shared with normal PCMs)
 785  * @playback_count: the number of substreams for playback
 786  * @capture_count: the number of substreams for capture
 787  * @rpcm: the pointer to store the new pcm instance
 788  *
 789  * Creates a new internal PCM instance with no userspace device or procfs
 790  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
 791  * will only be used internally by kernel drivers. i.e. it cannot be opened
 792  * by userspace. It provides existing ASoC components drivers with a substream
 793  * and access to any private data.
 794  *
 795  * The pcm operators have to be set afterwards to the new instance
 796  * via snd_pcm_set_ops().
 797  *
 798  * Return: Zero if successful, or a negative error code on failure.
 799  */
 800 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 801         int playback_count, int capture_count,
 802         struct snd_pcm **rpcm)
 803 {
 804         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 805                         true, rpcm);
 806 }
 807 EXPORT_SYMBOL(snd_pcm_new_internal);
 808
 809 static void free_chmap(struct snd_pcm_str *pstr)
 810 {
 811         if (pstr->chmap_kctl) {
 812                 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
 813                 pstr->chmap_kctl = NULL;
 814         }
 815 }
 816
 817 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 818 {
 819         struct snd_pcm_substream *substream, *substream_next;
 820 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 821         struct snd_pcm_oss_setup *setup, *setupn;
 822 #endif
 823         substream = pstr->substream;
 824         while (substream) {
 825                 substream_next = substream->next;
 826                 snd_pcm_timer_done(substream);
 827                 snd_pcm_substream_proc_done(substream);
 828                 kfree(substream);
 829                 substream = substream_next;
 830         }
 831         snd_pcm_stream_proc_done(pstr);
 832 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 833         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 834                 setupn = setup->next;
 835                 kfree(setup->task_name);
 836                 kfree(setup);
 837         }
 838 #endif
 839         free_chmap(pstr);
 840 }
 841
 842 static int snd_pcm_free(struct snd_pcm *pcm)
 843 {
 844         struct snd_pcm_notify *notify;
 845
 846         if (!pcm)
 847                 return 0;
 848         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 849                 notify->n_unregister(pcm);
 850         }
 851         if (pcm->private_free)
 852                 pcm->private_free(pcm);
 853         snd_pcm_lib_preallocate_free_for_all(pcm);
 854         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 855         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 856         kfree(pcm);
 857         return 0;
 858 }
 859
 860 static int snd_pcm_dev_free(struct snd_device *device)
 861 {
 862         struct snd_pcm *pcm = device->device_data;
 863         return snd_pcm_free(pcm);
 864 }
 865
 866 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 867                              struct file *file,
 868                              struct snd_pcm_substream **rsubstream)
 869 {
 870         struct snd_pcm_str * pstr;
 871         struct snd_pcm_substream *substream;
 872         struct snd_pcm_runtime *runtime;
 873         struct snd_ctl_file *kctl;
 874         struct snd_card *card;
 875         int prefer_subdevice = -1;
 876         size_t size;
 877
 878         if (snd_BUG_ON(!pcm || !rsubstream))
 879                 return -ENXIO;
 880         *rsubstream = NULL;
 881         pstr = &pcm->streams[stream];
 882         if (pstr->substream == NULL || pstr->substream_count == 0)
 883                 return -ENODEV;
 884
 885         card = pcm->card;
 886         read_lock(&card->ctl_files_rwlock);
 887         list_for_each_entry(kctl, &card->ctl_files, list) {
 888                 if (kctl->pid == task_pid(current)) {
 889                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 890                         if (prefer_subdevice != -1)
 891                                 break;
 892                 }
 893         }
 894         read_unlock(&card->ctl_files_rwlock);
 895
 896         switch (stream) {
 897         case SNDRV_PCM_STREAM_PLAYBACK:
 898                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 899                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 900                                 if (SUBSTREAM_BUSY(substream))
 901                                         return -EAGAIN;
 902                         }
 903                 }
 904                 break;
 905         case SNDRV_PCM_STREAM_CAPTURE:
 906                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 907                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 908                                 if (SUBSTREAM_BUSY(substream))
 909                                         return -EAGAIN;
 910                         }
 911                 }
 912                 break;
 913         default:
 914                 return -EINVAL;
 915         }
 916
 917         if (file->f_flags & O_APPEND) {
 918                 if (prefer_subdevice < 0) {
 919                         if (pstr->substream_count > 1)
 920                                 return -EINVAL; /* must be unique */
 921                         substream = pstr->substream;
 922                 } else {
 923                         for (substream = pstr->substream; substream;
 924                              substream = substream->next)
 925                                 if (substream->number == prefer_subdevice)
 926                                         break;
 927                 }
 928                 if (! substream)
 929                         return -ENODEV;
 930                 if (! SUBSTREAM_BUSY(substream))
 931                         return -EBADFD;
 932                 substream->ref_count++;
 933                 *rsubstream = substream;
 934                 return 0;
 935         }
 936
 937         if (prefer_subdevice >= 0) {
 938                 for (substream = pstr->substream; substream; substream = substream->next)
 939                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 940                                 goto __ok;
 941         }
 942         for (substream = pstr->substream; substream; substream = substream->next)
 943                 if (!SUBSTREAM_BUSY(substream))
 944                         break;
 945       __ok:
 946         if (substream == NULL)
 947                 return -EAGAIN;
 948
 949         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 950         if (runtime == NULL)
 951                 return -ENOMEM;
 952
 953         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 954         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 955         if (runtime->status == NULL) {
 956                 kfree(runtime);
 957                 return -ENOMEM;
 958         }
 959         memset((void*)runtime->status, 0, size);
 960
 961         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 962         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 963         if (runtime->control == NULL) {
 964                 snd_free_pages((void*)runtime->status,
 965                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 966                 kfree(runtime);
 967                 return -ENOMEM;
 968         }
 969         memset((void*)runtime->control, 0, size);
 970
 971         init_waitqueue_head(&runtime->sleep);
 972         init_waitqueue_head(&runtime->tsleep);
 973
 974         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 975
 976         substream->runtime = runtime;
 977         substream->private_data = pcm->private_data;
 978         substream->ref_count = 1;
 979         substream->f_flags = file->f_flags;
 980         substream->pid = get_pid(task_pid(current));
 981         pstr->substream_opened++;
 982         *rsubstream = substream;
 983         return 0;
 984 }
 985
 986 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 987 {
 988         struct snd_pcm_runtime *runtime;
 989
 990         if (PCM_RUNTIME_CHECK(substream))
 991                 return;
 992         runtime = substream->runtime;
 993         if (runtime->private_free != NULL)
 994                 runtime->private_free(runtime);
 995         snd_free_pages((void*)runtime->status,
 996                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 997         snd_free_pages((void*)runtime->control,
 998                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 999         kfree(runtime->hw_constraints.rules);
1000 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
1001         kfree(runtime->hwptr_log);
1002 #endif
1003         kfree(runtime);
1004         substream->runtime = NULL;
1005         put_pid(substream->pid);
1006         substream->pid = NULL;
1007         substream->pstr->substream_opened--;
1008 }
1009
1010 static ssize_t show_pcm_class(struct device *dev,
1011                               struct device_attribute *attr, char *buf)
1012 {
1013         struct snd_pcm *pcm;
1014         const char *str;
1015         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1016                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1017                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1018                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1019                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1020         };
1021
1022         if (! (pcm = dev_get_drvdata(dev)) ||
1023             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1024                 str = "none";
1025         else
1026                 str = strs[pcm->dev_class];
1027         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1028 }
1029
1030 static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1031 static struct attribute *pcm_dev_attrs[] = {
1032         &dev_attr_pcm_class.attr,
1033         NULL
1034 };
1035
1036 static struct attribute_group pcm_dev_attr_group = {
1037         .attrs  = pcm_dev_attrs,
1038 };
1039
1040 static const struct attribute_group *pcm_dev_attr_groups[] = {
1041         &pcm_dev_attr_group,
1042         NULL
1043 };
1044
1045 static int snd_pcm_dev_register(struct snd_device *device)
1046 {
1047         int cidx, err;
1048         struct snd_pcm_substream *substream;
1049         struct snd_pcm_notify *notify;
1050         char str[16];
1051         struct snd_pcm *pcm;
1052         struct device *dev;
1053
1054         if (snd_BUG_ON(!device || !device->device_data))
1055                 return -ENXIO;
1056         pcm = device->device_data;
1057         mutex_lock(&register_mutex);
1058         err = snd_pcm_add(pcm);
1059         if (err) {
1060                 mutex_unlock(&register_mutex);
1061                 return err;
1062         }
1063         for (cidx = 0; cidx < 2; cidx++) {
1064                 int devtype = -1;
1065                 if (pcm->streams[cidx].substream == NULL || pcm->internal)
1066                         continue;
1067                 switch (cidx) {
1068                 case SNDRV_PCM_STREAM_PLAYBACK:
1069                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1070                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1071                         break;
1072                 case SNDRV_PCM_STREAM_CAPTURE:
1073                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1074                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1075                         break;
1076                 }
1077                 /* device pointer to use, pcm->dev takes precedence if
1078                  * it is assigned, otherwise fall back to card's device
1079                  * if possible */
1080                 dev = pcm->dev;
1081                 if (!dev)
1082                         dev = snd_card_get_device_link(pcm->card);
1083                 /* register pcm */
1084                 err = snd_register_device_for_dev(devtype, pcm->card,
1085                                                   pcm->device,
1086                                                   &snd_pcm_f_ops[cidx],
1087                                                   pcm, str, dev);
1088                 if (err < 0) {
1089                         list_del(&pcm->list);
1090                         mutex_unlock(&register_mutex);
1091                         return err;
1092                 }
1093
1094                 dev = snd_get_device(devtype, pcm->card, pcm->device);
1095                 if (dev) {
1096                         err = sysfs_create_groups(&dev->kobj,
1097                                                   pcm_dev_attr_groups);
1098                         if (err < 0)
1099                                 dev_warn(dev,
1100                                          "pcm %d:%d: cannot create sysfs groups\n",
1101                                          pcm->card->number, pcm->device);
1102                         put_device(dev);
1103                 }
1104
1105                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1106                         snd_pcm_timer_init(substream);
1107         }
1108
1109         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1110                 notify->n_register(pcm);
1111
1112         mutex_unlock(&register_mutex);
1113         return 0;
1114 }
1115
1116 static int snd_pcm_dev_disconnect(struct snd_device *device)
1117 {
1118         struct snd_pcm *pcm = device->device_data;
1119         struct snd_pcm_notify *notify;
1120         struct snd_pcm_substream *substream;
1121         int cidx, devtype;
1122
1123         mutex_lock(&register_mutex);
1124         if (list_empty(&pcm->list))
1125                 goto unlock;
1126
1127         mutex_lock(&pcm->open_mutex);
1128         wake_up(&pcm->open_wait);
1129         list_del_init(&pcm->list);
1130         for (cidx = 0; cidx < 2; cidx++)
1131                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1132                         snd_pcm_stream_lock_irq(substream);
1133                         if (substream->runtime) {
1134                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1135                                 wake_up(&substream->runtime->sleep);
1136                                 wake_up(&substream->runtime->tsleep);
1137                         }
1138                         snd_pcm_stream_unlock_irq(substream);
1139                 }
1140         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1141                 notify->n_disconnect(pcm);
1142         }
1143         for (cidx = 0; cidx < 2; cidx++) {
1144                 devtype = -1;
1145                 switch (cidx) {
1146                 case SNDRV_PCM_STREAM_PLAYBACK:
1147                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1148                         break;
1149                 case SNDRV_PCM_STREAM_CAPTURE:
1150                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1151                         break;
1152                 }
1153                 snd_unregister_device(devtype, pcm->card, pcm->device);
1154                 free_chmap(&pcm->streams[cidx]);
1155         }
1156         mutex_unlock(&pcm->open_mutex);
1157  unlock:
1158         mutex_unlock(&register_mutex);
1159         return 0;
1160 }
1161
1162 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1163 {
1164         struct snd_pcm *pcm;
1165
1166         if (snd_BUG_ON(!notify ||
1167                        !notify->n_register ||
1168                        !notify->n_unregister ||
1169                        !notify->n_disconnect))
1170                 return -EINVAL;
1171         mutex_lock(&register_mutex);
1172         if (nfree) {
1173                 list_del(&notify->list);
1174                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1175                         notify->n_unregister(pcm);
1176         } else {
1177                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1178                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1179                         notify->n_register(pcm);
1180         }
1181         mutex_unlock(&register_mutex);
1182         return 0;
1183 }
1184
1185 EXPORT_SYMBOL(snd_pcm_notify);
1186
1187 #ifdef CONFIG_PROC_FS
1188 /*
1189  *  Info interface
1190  */
1191
1192 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1193                               struct snd_info_buffer *buffer)
1194 {
1195         struct snd_pcm *pcm;
1196
1197         mutex_lock(&register_mutex);
1198         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1199                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1200                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1201                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1202                         snd_iprintf(buffer, " : playback %i",
1203                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1204                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1205                         snd_iprintf(buffer, " : capture %i",
1206                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1207                 snd_iprintf(buffer, "\n");
1208         }
1209         mutex_unlock(&register_mutex);
1210 }
1211
1212 static struct snd_info_entry *snd_pcm_proc_entry;
1213
1214 static void snd_pcm_proc_init(void)
1215 {
1216         struct snd_info_entry *entry;
1217
1218         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1219                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1220                 if (snd_info_register(entry) < 0) {
1221                         snd_info_free_entry(entry);
1222                         entry = NULL;
1223                 }
1224         }
1225         snd_pcm_proc_entry = entry;
1226 }
1227
1228 static void snd_pcm_proc_done(void)
1229 {
1230         snd_info_free_entry(snd_pcm_proc_entry);
1231 }
1232
1233 #else /* !CONFIG_PROC_FS */
1234 #define snd_pcm_proc_init()
1235 #define snd_pcm_proc_done()
1236 #endif /* CONFIG_PROC_FS */
1237
1238
1239 /*
1240  *  ENTRY functions
1241  */
1242
1243 static int __init alsa_pcm_init(void)
1244 {
1245         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1246         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1247         snd_pcm_proc_init();
1248         return 0;
1249 }
1250
1251 static void __exit alsa_pcm_exit(void)
1252 {
1253         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1254         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1255         snd_pcm_proc_done();
1256 }
1257
1258 module_init(alsa_pcm_init)
1259 module_exit(alsa_pcm_exit)