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 #include "pcm_local.h"
  35
  36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  37 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  38 MODULE_LICENSE("GPL");
  39
  40 static LIST_HEAD(snd_pcm_devices);
  41 static DEFINE_MUTEX(register_mutex);
  42 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
  43 static LIST_HEAD(snd_pcm_notify_list);
  44 #endif
  45
  46 static int snd_pcm_free(struct snd_pcm *pcm);
  47 static int snd_pcm_dev_free(struct snd_device *device);
  48 static int snd_pcm_dev_register(struct snd_device *device);
  49 static int snd_pcm_dev_disconnect(struct snd_device *device);
  50
  51 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
  52 {
  53         struct snd_pcm *pcm;
  54
  55         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  56                 if (pcm->card == card && pcm->device == device)
  57                         return pcm;
  58         }
  59         return NULL;
  60 }
  61
  62 static int snd_pcm_next(struct snd_card *card, int device)
  63 {
  64         struct snd_pcm *pcm;
  65
  66         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  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         if (newpcm->internal)
  80                 return 0;
  81
  82         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  83                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
  84                         return -EBUSY;
  85                 if (pcm->card->number > newpcm->card->number ||
  86                                 (pcm->card == newpcm->card &&
  87                                 pcm->device > newpcm->device)) {
  88                         list_add(&newpcm->list, pcm->list.prev);
  89                         return 0;
  90                 }
  91         }
  92         list_add_tail(&newpcm->list, &snd_pcm_devices);
  93         return 0;
  94 }
  95
  96 static int snd_pcm_control_ioctl(struct snd_card *card,
  97                                  struct snd_ctl_file *control,
  98                                  unsigned int cmd, unsigned long arg)
  99 {
 100         switch (cmd) {
 101         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
 102                 {
 103                         int device;
 104
 105                         if (get_user(device, (int __user *)arg))
 106                                 return -EFAULT;
 107                         mutex_lock(&register_mutex);
 108                         device = snd_pcm_next(card, device);
 109                         mutex_unlock(&register_mutex);
 110                         if (put_user(device, (int __user *)arg))
 111                                 return -EFAULT;
 112                         return 0;
 113                 }
 114         case SNDRV_CTL_IOCTL_PCM_INFO:
 115                 {
 116                         struct snd_pcm_info __user *info;
 117                         unsigned int device, subdevice;
 118                         int stream;
 119                         struct snd_pcm *pcm;
 120                         struct snd_pcm_str *pstr;
 121                         struct snd_pcm_substream *substream;
 122                         int err;
 123
 124                         info = (struct snd_pcm_info __user *)arg;
 125                         if (get_user(device, &info->device))
 126                                 return -EFAULT;
 127                         if (get_user(stream, &info->stream))
 128                                 return -EFAULT;
 129                         if (stream < 0 || stream > 1)
 130                                 return -EINVAL;
 131                         if (get_user(subdevice, &info->subdevice))
 132                                 return -EFAULT;
 133                         mutex_lock(&register_mutex);
 134                         pcm = snd_pcm_get(card, device);
 135                         if (pcm == NULL) {
 136                                 err = -ENXIO;
 137                                 goto _error;
 138                         }
 139                         pstr = &pcm->streams[stream];
 140                         if (pstr->substream_count == 0) {
 141                                 err = -ENOENT;
 142                                 goto _error;
 143                         }
 144                         if (subdevice >= pstr->substream_count) {
 145                                 err = -ENXIO;
 146                                 goto _error;
 147                         }
 148                         for (substream = pstr->substream; substream;
 149                              substream = substream->next)
 150                                 if (substream->number == (int)subdevice)
 151                                         break;
 152                         if (substream == NULL) {
 153                                 err = -ENXIO;
 154                                 goto _error;
 155                         }
 156                         mutex_lock(&pcm->open_mutex);
 157                         err = snd_pcm_info_user(substream, info);
 158                         mutex_unlock(&pcm->open_mutex);
 159                 _error:
 160                         mutex_unlock(&register_mutex);
 161                         return err;
 162                 }
 163         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 164                 {
 165                         int val;
 166
 167                         if (get_user(val, (int __user *)arg))
 168                                 return -EFAULT;
 169                         control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
 170                         return 0;
 171                 }
 172         }
 173         return -ENOIOCTLCMD;
 174 }
 175
 176 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 177
 178 static char *snd_pcm_format_names[] = {
 179         FORMAT(S8),
 180         FORMAT(U8),
 181         FORMAT(S16_LE),
 182         FORMAT(S16_BE),
 183         FORMAT(U16_LE),
 184         FORMAT(U16_BE),
 185         FORMAT(S24_LE),
 186         FORMAT(S24_BE),
 187         FORMAT(U24_LE),
 188         FORMAT(U24_BE),
 189         FORMAT(S32_LE),
 190         FORMAT(S32_BE),
 191         FORMAT(U32_LE),
 192         FORMAT(U32_BE),
 193         FORMAT(FLOAT_LE),
 194         FORMAT(FLOAT_BE),
 195         FORMAT(FLOAT64_LE),
 196         FORMAT(FLOAT64_BE),
 197         FORMAT(IEC958_SUBFRAME_LE),
 198         FORMAT(IEC958_SUBFRAME_BE),
 199         FORMAT(MU_LAW),
 200         FORMAT(A_LAW),
 201         FORMAT(IMA_ADPCM),
 202         FORMAT(MPEG),
 203         FORMAT(GSM),
 204         FORMAT(SPECIAL),
 205         FORMAT(S24_3LE),
 206         FORMAT(S24_3BE),
 207         FORMAT(U24_3LE),
 208         FORMAT(U24_3BE),
 209         FORMAT(S20_3LE),
 210         FORMAT(S20_3BE),
 211         FORMAT(U20_3LE),
 212         FORMAT(U20_3BE),
 213         FORMAT(S18_3LE),
 214         FORMAT(S18_3BE),
 215         FORMAT(U18_3LE),
 216         FORMAT(U18_3BE),
 217         FORMAT(G723_24),
 218         FORMAT(G723_24_1B),
 219         FORMAT(G723_40),
 220         FORMAT(G723_40_1B),
 221         FORMAT(DSD_U8),
 222         FORMAT(DSD_U16_LE),
 223         FORMAT(DSD_U32_LE),
 224         FORMAT(DSD_U16_BE),
 225         FORMAT(DSD_U32_BE),
 226 };
 227
 228 /**
 229  * snd_pcm_format_name - Return a name string for the given PCM format
 230  * @format: PCM format
 231  */
 232 const char *snd_pcm_format_name(snd_pcm_format_t format)
 233 {
 234         if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
 235                 return "Unknown";
 236         return snd_pcm_format_names[(__force unsigned int)format];
 237 }
 238 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
 239
 240 #ifdef CONFIG_SND_VERBOSE_PROCFS
 241
 242 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 243 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 244 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 245 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 246 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 247 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 248 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 249 #define START(v) [SNDRV_PCM_START_##v] = #v
 250 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 251
 252 static char *snd_pcm_stream_names[] = {
 253         STREAM(PLAYBACK),
 254         STREAM(CAPTURE),
 255 };
 256
 257 static char *snd_pcm_state_names[] = {
 258         STATE(OPEN),
 259         STATE(SETUP),
 260         STATE(PREPARED),
 261         STATE(RUNNING),
 262         STATE(XRUN),
 263         STATE(DRAINING),
 264         STATE(PAUSED),
 265         STATE(SUSPENDED),
 266 };
 267
 268 static char *snd_pcm_access_names[] = {
 269         ACCESS(MMAP_INTERLEAVED),
 270         ACCESS(MMAP_NONINTERLEAVED),
 271         ACCESS(MMAP_COMPLEX),
 272         ACCESS(RW_INTERLEAVED),
 273         ACCESS(RW_NONINTERLEAVED),
 274 };
 275
 276 static char *snd_pcm_subformat_names[] = {
 277         SUBFORMAT(STD),
 278 };
 279
 280 static char *snd_pcm_tstamp_mode_names[] = {
 281         TSTAMP(NONE),
 282         TSTAMP(ENABLE),
 283 };
 284
 285 static const char *snd_pcm_stream_name(int stream)
 286 {
 287         return snd_pcm_stream_names[stream];
 288 }
 289
 290 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 291 {
 292         return snd_pcm_access_names[(__force int)access];
 293 }
 294
 295 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 296 {
 297         return snd_pcm_subformat_names[(__force int)subformat];
 298 }
 299
 300 static const char *snd_pcm_tstamp_mode_name(int mode)
 301 {
 302         return snd_pcm_tstamp_mode_names[mode];
 303 }
 304
 305 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 306 {
 307         return snd_pcm_state_names[(__force int)state];
 308 }
 309
 310 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 311 #include <linux/soundcard.h>
 312
 313 static const char *snd_pcm_oss_format_name(int format)
 314 {
 315         switch (format) {
 316         case AFMT_MU_LAW:
 317                 return "MU_LAW";
 318         case AFMT_A_LAW:
 319                 return "A_LAW";
 320         case AFMT_IMA_ADPCM:
 321                 return "IMA_ADPCM";
 322         case AFMT_U8:
 323                 return "U8";
 324         case AFMT_S16_LE:
 325                 return "S16_LE";
 326         case AFMT_S16_BE:
 327                 return "S16_BE";
 328         case AFMT_S8:
 329                 return "S8";
 330         case AFMT_U16_LE:
 331                 return "U16_LE";
 332         case AFMT_U16_BE:
 333                 return "U16_BE";
 334         case AFMT_MPEG:
 335                 return "MPEG";
 336         default:
 337                 return "unknown";
 338         }
 339 }
 340 #endif
 341
 342 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 343                                    struct snd_info_buffer *buffer)
 344 {
 345         struct snd_pcm_info *info;
 346         int err;
 347
 348         if (! substream)
 349                 return;
 350
 351         info = kmalloc(sizeof(*info), GFP_KERNEL);
 352         if (!info)
 353                 return;
 354
 355         err = snd_pcm_info(substream, info);
 356         if (err < 0) {
 357                 snd_iprintf(buffer, "error %d\n", err);
 358                 kfree(info);
 359                 return;
 360         }
 361         snd_iprintf(buffer, "card: %d\n", info->card);
 362         snd_iprintf(buffer, "device: %d\n", info->device);
 363         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 364         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 365         snd_iprintf(buffer, "id: %s\n", info->id);
 366         snd_iprintf(buffer, "name: %s\n", info->name);
 367         snd_iprintf(buffer, "subname: %s\n", info->subname);
 368         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 369         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 370         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 371         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 372         kfree(info);
 373 }
 374
 375 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 376                                           struct snd_info_buffer *buffer)
 377 {
 378         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 379                                buffer);
 380 }
 381
 382 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 383                                              struct snd_info_buffer *buffer)
 384 {
 385         snd_pcm_proc_info_read(entry->private_data, buffer);
 386 }
 387
 388 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 389                                                   struct snd_info_buffer *buffer)
 390 {
 391         struct snd_pcm_substream *substream = entry->private_data;
 392         struct snd_pcm_runtime *runtime;
 393
 394         mutex_lock(&substream->pcm->open_mutex);
 395         runtime = substream->runtime;
 396         if (!runtime) {
 397                 snd_iprintf(buffer, "closed\n");
 398                 goto unlock;
 399         }
 400         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 401                 snd_iprintf(buffer, "no setup\n");
 402                 goto unlock;
 403         }
 404         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 405         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 406         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 407         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 408         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 409         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 410         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 411 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 412         if (substream->oss.oss) {
 413                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 414                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 415                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 416                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 417                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 418                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 419         }
 420 #endif
 421  unlock:
 422         mutex_unlock(&substream->pcm->open_mutex);
 423 }
 424
 425 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 426                                                   struct snd_info_buffer *buffer)
 427 {
 428         struct snd_pcm_substream *substream = entry->private_data;
 429         struct snd_pcm_runtime *runtime;
 430
 431         mutex_lock(&substream->pcm->open_mutex);
 432         runtime = substream->runtime;
 433         if (!runtime) {
 434                 snd_iprintf(buffer, "closed\n");
 435                 goto unlock;
 436         }
 437         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 438                 snd_iprintf(buffer, "no setup\n");
 439                 goto unlock;
 440         }
 441         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 442         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 443         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 444         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 445         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 446         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 447         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 448         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 449  unlock:
 450         mutex_unlock(&substream->pcm->open_mutex);
 451 }
 452
 453 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 454                                                struct snd_info_buffer *buffer)
 455 {
 456         struct snd_pcm_substream *substream = entry->private_data;
 457         struct snd_pcm_runtime *runtime;
 458         struct snd_pcm_status status;
 459         int err;
 460
 461         mutex_lock(&substream->pcm->open_mutex);
 462         runtime = substream->runtime;
 463         if (!runtime) {
 464                 snd_iprintf(buffer, "closed\n");
 465                 goto unlock;
 466         }
 467         memset(&status, 0, sizeof(status));
 468         err = snd_pcm_status(substream, &status);
 469         if (err < 0) {
 470                 snd_iprintf(buffer, "error %d\n", err);
 471                 goto unlock;
 472         }
 473         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 474         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
 475         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 476                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 477         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 478                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 479         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 480         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 481         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 482         snd_iprintf(buffer, "-----\n");
 483         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 484         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 485  unlock:
 486         mutex_unlock(&substream->pcm->open_mutex);
 487 }
 488
 489 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 490 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
 491                                          struct snd_info_buffer *buffer)
 492 {
 493         struct snd_pcm_substream *substream = entry->private_data;
 494         struct snd_pcm_runtime *runtime;
 495
 496         snd_pcm_stream_lock_irq(substream);
 497         runtime = substream->runtime;
 498         if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 499                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 500         snd_pcm_stream_unlock_irq(substream);
 501 }
 502
 503 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 504                                     struct snd_info_buffer *buffer)
 505 {
 506         struct snd_pcm_str *pstr = entry->private_data;
 507         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 508 }
 509
 510 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 511                                      struct snd_info_buffer *buffer)
 512 {
 513         struct snd_pcm_str *pstr = entry->private_data;
 514         char line[64];
 515         if (!snd_info_get_line(buffer, line, sizeof(line)))
 516                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 517 }
 518 #endif
 519
 520 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 521 {
 522         struct snd_pcm *pcm = pstr->pcm;
 523         struct snd_info_entry *entry;
 524         char name[16];
 525
 526         sprintf(name, "pcm%i%c", pcm->device,
 527                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 528         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 529                 return -ENOMEM;
 530         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 531         if (snd_info_register(entry) < 0) {
 532                 snd_info_free_entry(entry);
 533                 return -ENOMEM;
 534         }
 535         pstr->proc_root = entry;
 536
 537         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 538                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 539                 if (snd_info_register(entry) < 0) {
 540                         snd_info_free_entry(entry);
 541                         entry = NULL;
 542                 }
 543         }
 544         pstr->proc_info_entry = entry;
 545
 546 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 547         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 548                                                 pstr->proc_root)) != NULL) {
 549                 entry->c.text.read = snd_pcm_xrun_debug_read;
 550                 entry->c.text.write = snd_pcm_xrun_debug_write;
 551                 entry->mode |= S_IWUSR;
 552                 entry->private_data = pstr;
 553                 if (snd_info_register(entry) < 0) {
 554                         snd_info_free_entry(entry);
 555                         entry = NULL;
 556                 }
 557         }
 558         pstr->proc_xrun_debug_entry = entry;
 559 #endif
 560         return 0;
 561 }
 562
 563 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 564 {
 565 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 566         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 567         pstr->proc_xrun_debug_entry = NULL;
 568 #endif
 569         snd_info_free_entry(pstr->proc_info_entry);
 570         pstr->proc_info_entry = NULL;
 571         snd_info_free_entry(pstr->proc_root);
 572         pstr->proc_root = NULL;
 573         return 0;
 574 }
 575
 576 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 577 {
 578         struct snd_info_entry *entry;
 579         struct snd_card *card;
 580         char name[16];
 581
 582         card = substream->pcm->card;
 583
 584         sprintf(name, "sub%i", substream->number);
 585         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 586                 return -ENOMEM;
 587         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 588         if (snd_info_register(entry) < 0) {
 589                 snd_info_free_entry(entry);
 590                 return -ENOMEM;
 591         }
 592         substream->proc_root = entry;
 593
 594         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 595                 snd_info_set_text_ops(entry, substream,
 596                                       snd_pcm_substream_proc_info_read);
 597                 if (snd_info_register(entry) < 0) {
 598                         snd_info_free_entry(entry);
 599                         entry = NULL;
 600                 }
 601         }
 602         substream->proc_info_entry = entry;
 603
 604         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 605                 snd_info_set_text_ops(entry, substream,
 606                                       snd_pcm_substream_proc_hw_params_read);
 607                 if (snd_info_register(entry) < 0) {
 608                         snd_info_free_entry(entry);
 609                         entry = NULL;
 610                 }
 611         }
 612         substream->proc_hw_params_entry = entry;
 613
 614         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 615                 snd_info_set_text_ops(entry, substream,
 616                                       snd_pcm_substream_proc_sw_params_read);
 617                 if (snd_info_register(entry) < 0) {
 618                         snd_info_free_entry(entry);
 619                         entry = NULL;
 620                 }
 621         }
 622         substream->proc_sw_params_entry = entry;
 623
 624         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 625                 snd_info_set_text_ops(entry, substream,
 626                                       snd_pcm_substream_proc_status_read);
 627                 if (snd_info_register(entry) < 0) {
 628                         snd_info_free_entry(entry);
 629                         entry = NULL;
 630                 }
 631         }
 632         substream->proc_status_entry = entry;
 633
 634 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 635         entry = snd_info_create_card_entry(card, "xrun_injection",
 636                                            substream->proc_root);
 637         if (entry) {
 638                 entry->private_data = substream;
 639                 entry->c.text.read = NULL;
 640                 entry->c.text.write = snd_pcm_xrun_injection_write;
 641                 entry->mode = S_IFREG | S_IWUSR;
 642                 if (snd_info_register(entry) < 0) {
 643                         snd_info_free_entry(entry);
 644                         entry = NULL;
 645                 }
 646         }
 647         substream->proc_xrun_injection_entry = entry;
 648 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */
 649
 650         return 0;
 651 }
 652
 653 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 654 {
 655         snd_info_free_entry(substream->proc_info_entry);
 656         substream->proc_info_entry = NULL;
 657         snd_info_free_entry(substream->proc_hw_params_entry);
 658         substream->proc_hw_params_entry = NULL;
 659         snd_info_free_entry(substream->proc_sw_params_entry);
 660         substream->proc_sw_params_entry = NULL;
 661         snd_info_free_entry(substream->proc_status_entry);
 662         substream->proc_status_entry = NULL;
 663 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 664         snd_info_free_entry(substream->proc_xrun_injection_entry);
 665         substream->proc_xrun_injection_entry = NULL;
 666 #endif
 667         snd_info_free_entry(substream->proc_root);
 668         substream->proc_root = NULL;
 669         return 0;
 670 }
 671 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 672 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 673 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 674 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 675 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 676 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 677
 678 static const struct attribute_group *pcm_dev_attr_groups[];
 679
 680 /**
 681  * snd_pcm_new_stream - create a new PCM stream
 682  * @pcm: the pcm instance
 683  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 684  * @substream_count: the number of substreams
 685  *
 686  * Creates a new stream for the pcm.
 687  * The corresponding stream on the pcm must have been empty before
 688  * calling this, i.e. zero must be given to the argument of
 689  * snd_pcm_new().
 690  *
 691  * Return: Zero if successful, or a negative error code on failure.
 692  */
 693 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 694 {
 695         int idx, err;
 696         struct snd_pcm_str *pstr = &pcm->streams[stream];
 697         struct snd_pcm_substream *substream, *prev;
 698
 699 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 700         mutex_init(&pstr->oss.setup_mutex);
 701 #endif
 702         pstr->stream = stream;
 703         pstr->pcm = pcm;
 704         pstr->substream_count = substream_count;
 705         if (!substream_count)
 706                 return 0;
 707
 708         snd_device_initialize(&pstr->dev, pcm->card);
 709         pstr->dev.groups = pcm_dev_attr_groups;
 710         dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
 711                      stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 712
 713         if (!pcm->internal) {
 714                 err = snd_pcm_stream_proc_init(pstr);
 715                 if (err < 0) {
 716                         pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
 717                         return err;
 718                 }
 719         }
 720         prev = NULL;
 721         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 722                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 723                 if (!substream)
 724                         return -ENOMEM;
 725                 substream->pcm = pcm;
 726                 substream->pstr = pstr;
 727                 substream->number = idx;
 728                 substream->stream = stream;
 729                 sprintf(substream->name, "subdevice #%i", idx);
 730                 substream->buffer_bytes_max = UINT_MAX;
 731                 if (prev == NULL)
 732                         pstr->substream = substream;
 733                 else
 734                         prev->next = substream;
 735
 736                 if (!pcm->internal) {
 737                         err = snd_pcm_substream_proc_init(substream);
 738                         if (err < 0) {
 739                                 pcm_err(pcm,
 740                                         "Error in snd_pcm_stream_proc_init\n");
 741                                 if (prev == NULL)
 742                                         pstr->substream = NULL;
 743                                 else
 744                                         prev->next = NULL;
 745                                 kfree(substream);
 746                                 return err;
 747                         }
 748                 }
 749                 substream->group = &substream->self_group;
 750                 spin_lock_init(&substream->self_group.lock);
 751                 mutex_init(&substream->self_group.mutex);
 752                 INIT_LIST_HEAD(&substream->self_group.substreams);
 753                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 754                 atomic_set(&substream->mmap_count, 0);
 755                 prev = substream;
 756         }
 757         return 0;
 758 }
 759 EXPORT_SYMBOL(snd_pcm_new_stream);
 760
 761 static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
 762                 int playback_count, int capture_count, bool internal,
 763                 struct snd_pcm **rpcm)
 764 {
 765         struct snd_pcm *pcm;
 766         int err;
 767         static struct snd_device_ops ops = {
 768                 .dev_free = snd_pcm_dev_free,
 769                 .dev_register = snd_pcm_dev_register,
 770                 .dev_disconnect = snd_pcm_dev_disconnect,
 771         };
 772
 773         if (snd_BUG_ON(!card))
 774                 return -ENXIO;
 775         if (rpcm)
 776                 *rpcm = NULL;
 777         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 778         if (!pcm)
 779                 return -ENOMEM;
 780         pcm->card = card;
 781         pcm->device = device;
 782         pcm->internal = internal;
 783         mutex_init(&pcm->open_mutex);
 784         init_waitqueue_head(&pcm->open_wait);
 785         INIT_LIST_HEAD(&pcm->list);
 786         if (id)
 787                 strlcpy(pcm->id, id, sizeof(pcm->id));
 788         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 789                 snd_pcm_free(pcm);
 790                 return err;
 791         }
 792         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 793                 snd_pcm_free(pcm);
 794                 return err;
 795         }
 796         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 797                 snd_pcm_free(pcm);
 798                 return err;
 799         }
 800         if (rpcm)
 801                 *rpcm = pcm;
 802         return 0;
 803 }
 804
 805 /**
 806  * snd_pcm_new - create a new PCM instance
 807  * @card: the card instance
 808  * @id: the id string
 809  * @device: the device index (zero based)
 810  * @playback_count: the number of substreams for playback
 811  * @capture_count: the number of substreams for capture
 812  * @rpcm: the pointer to store the new pcm instance
 813  *
 814  * Creates a new PCM instance.
 815  *
 816  * The pcm operators have to be set afterwards to the new instance
 817  * via snd_pcm_set_ops().
 818  *
 819  * Return: Zero if successful, or a negative error code on failure.
 820  */
 821 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 822                 int playback_count, int capture_count, struct snd_pcm **rpcm)
 823 {
 824         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 825                         false, rpcm);
 826 }
 827 EXPORT_SYMBOL(snd_pcm_new);
 828
 829 /**
 830  * snd_pcm_new_internal - create a new internal PCM instance
 831  * @card: the card instance
 832  * @id: the id string
 833  * @device: the device index (zero based - shared with normal PCMs)
 834  * @playback_count: the number of substreams for playback
 835  * @capture_count: the number of substreams for capture
 836  * @rpcm: the pointer to store the new pcm instance
 837  *
 838  * Creates a new internal PCM instance with no userspace device or procfs
 839  * entries. This is used by ASoC Back End PCMs in order to create a PCM that
 840  * will only be used internally by kernel drivers. i.e. it cannot be opened
 841  * by userspace. It provides existing ASoC components drivers with a substream
 842  * and access to any private data.
 843  *
 844  * The pcm operators have to be set afterwards to the new instance
 845  * via snd_pcm_set_ops().
 846  *
 847  * Return: Zero if successful, or a negative error code on failure.
 848  */
 849 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 850         int playback_count, int capture_count,
 851         struct snd_pcm **rpcm)
 852 {
 853         return _snd_pcm_new(card, id, device, playback_count, capture_count,
 854                         true, rpcm);
 855 }
 856 EXPORT_SYMBOL(snd_pcm_new_internal);
 857
 858 static void free_chmap(struct snd_pcm_str *pstr)
 859 {
 860         if (pstr->chmap_kctl) {
 861                 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
 862                 pstr->chmap_kctl = NULL;
 863         }
 864 }
 865
 866 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 867 {
 868         struct snd_pcm_substream *substream, *substream_next;
 869 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 870         struct snd_pcm_oss_setup *setup, *setupn;
 871 #endif
 872         substream = pstr->substream;
 873         while (substream) {
 874                 substream_next = substream->next;
 875                 snd_pcm_timer_done(substream);
 876                 snd_pcm_substream_proc_done(substream);
 877                 kfree(substream);
 878                 substream = substream_next;
 879         }
 880         snd_pcm_stream_proc_done(pstr);
 881 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 882         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 883                 setupn = setup->next;
 884                 kfree(setup->task_name);
 885                 kfree(setup);
 886         }
 887 #endif
 888         free_chmap(pstr);
 889         if (pstr->substream_count)
 890                 put_device(&pstr->dev);
 891 }
 892
 893 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 894 #define pcm_call_notify(pcm, call)                                      \
 895         do {                                                            \
 896                 struct snd_pcm_notify *_notify;                         \
 897                 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
 898                         _notify->call(pcm);                             \
 899         } while (0)
 900 #else
 901 #define pcm_call_notify(pcm, call) do {} while (0)
 902 #endif
 903
 904 static int snd_pcm_free(struct snd_pcm *pcm)
 905 {
 906         if (!pcm)
 907                 return 0;
 908         if (!pcm->internal)
 909                 pcm_call_notify(pcm, n_unregister);
 910         if (pcm->private_free)
 911                 pcm->private_free(pcm);
 912         snd_pcm_lib_preallocate_free_for_all(pcm);
 913         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 914         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 915         kfree(pcm);
 916         return 0;
 917 }
 918
 919 static int snd_pcm_dev_free(struct snd_device *device)
 920 {
 921         struct snd_pcm *pcm = device->device_data;
 922         return snd_pcm_free(pcm);
 923 }
 924
 925 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 926                              struct file *file,
 927                              struct snd_pcm_substream **rsubstream)
 928 {
 929         struct snd_pcm_str * pstr;
 930         struct snd_pcm_substream *substream;
 931         struct snd_pcm_runtime *runtime;
 932         struct snd_card *card;
 933         int prefer_subdevice;
 934         size_t size;
 935
 936         if (snd_BUG_ON(!pcm || !rsubstream))
 937                 return -ENXIO;
 938         if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
 939                        stream != SNDRV_PCM_STREAM_CAPTURE))
 940                 return -EINVAL;
 941         *rsubstream = NULL;
 942         pstr = &pcm->streams[stream];
 943         if (pstr->substream == NULL || pstr->substream_count == 0)
 944                 return -ENODEV;
 945
 946         card = pcm->card;
 947         prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
 948
 949         if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 950                 int opposite = !stream;
 951
 952                 for (substream = pcm->streams[opposite].substream; substream;
 953                      substream = substream->next) {
 954                         if (SUBSTREAM_BUSY(substream))
 955                                 return -EAGAIN;
 956                 }
 957         }
 958
 959         if (file->f_flags & O_APPEND) {
 960                 if (prefer_subdevice < 0) {
 961                         if (pstr->substream_count > 1)
 962                                 return -EINVAL; /* must be unique */
 963                         substream = pstr->substream;
 964                 } else {
 965                         for (substream = pstr->substream; substream;
 966                              substream = substream->next)
 967                                 if (substream->number == prefer_subdevice)
 968                                         break;
 969                 }
 970                 if (! substream)
 971                         return -ENODEV;
 972                 if (! SUBSTREAM_BUSY(substream))
 973                         return -EBADFD;
 974                 substream->ref_count++;
 975                 *rsubstream = substream;
 976                 return 0;
 977         }
 978
 979         for (substream = pstr->substream; substream; substream = substream->next) {
 980                 if (!SUBSTREAM_BUSY(substream) &&
 981                     (prefer_subdevice == -1 ||
 982                      substream->number == prefer_subdevice))
 983                         break;
 984         }
 985         if (substream == NULL)
 986                 return -EAGAIN;
 987
 988         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 989         if (runtime == NULL)
 990                 return -ENOMEM;
 991
 992         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 993         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 994         if (runtime->status == NULL) {
 995                 kfree(runtime);
 996                 return -ENOMEM;
 997         }
 998         memset((void*)runtime->status, 0, size);
 999
1000         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
1001         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
1002         if (runtime->control == NULL) {
1003                 snd_free_pages((void*)runtime->status,
1004                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1005                 kfree(runtime);
1006                 return -ENOMEM;
1007         }
1008         memset((void*)runtime->control, 0, size);
1009
1010         init_waitqueue_head(&runtime->sleep);
1011         init_waitqueue_head(&runtime->tsleep);
1012
1013         runtime->status->state = SNDRV_PCM_STATE_OPEN;
1014
1015         substream->runtime = runtime;
1016         substream->private_data = pcm->private_data;
1017         substream->ref_count = 1;
1018         substream->f_flags = file->f_flags;
1019         substream->pid = get_pid(task_pid(current));
1020         pstr->substream_opened++;
1021         *rsubstream = substream;
1022         return 0;
1023 }
1024
1025 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
1026 {
1027         struct snd_pcm_runtime *runtime;
1028
1029         if (PCM_RUNTIME_CHECK(substream))
1030                 return;
1031         runtime = substream->runtime;
1032         if (runtime->private_free != NULL)
1033                 runtime->private_free(runtime);
1034         snd_free_pages((void*)runtime->status,
1035                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1036         snd_free_pages((void*)runtime->control,
1037                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1038         kfree(runtime->hw_constraints.rules);
1039         kfree(runtime);
1040         substream->runtime = NULL;
1041         put_pid(substream->pid);
1042         substream->pid = NULL;
1043         substream->pstr->substream_opened--;
1044 }
1045
1046 static ssize_t show_pcm_class(struct device *dev,
1047                               struct device_attribute *attr, char *buf)
1048 {
1049         struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1050         struct snd_pcm *pcm = pstr->pcm;
1051         const char *str;
1052         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1053                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1054                 [SNDRV_PCM_CLASS_MULTI] = "multi",
1055                 [SNDRV_PCM_CLASS_MODEM] = "modem",
1056                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1057         };
1058
1059         if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
1060                 str = "none";
1061         else
1062                 str = strs[pcm->dev_class];
1063         return snprintf(buf, PAGE_SIZE, "%s\n", str);
1064 }
1065
1066 static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1067 static struct attribute *pcm_dev_attrs[] = {
1068         &dev_attr_pcm_class.attr,
1069         NULL
1070 };
1071
1072 static const struct attribute_group pcm_dev_attr_group = {
1073         .attrs  = pcm_dev_attrs,
1074 };
1075
1076 static const struct attribute_group *pcm_dev_attr_groups[] = {
1077         &pcm_dev_attr_group,
1078         NULL
1079 };
1080
1081 static int snd_pcm_dev_register(struct snd_device *device)
1082 {
1083         int cidx, err;
1084         struct snd_pcm_substream *substream;
1085         struct snd_pcm *pcm;
1086
1087         if (snd_BUG_ON(!device || !device->device_data))
1088                 return -ENXIO;
1089         pcm = device->device_data;
1090         if (pcm->internal)
1091                 return 0;
1092
1093         mutex_lock(&register_mutex);
1094         err = snd_pcm_add(pcm);
1095         if (err)
1096                 goto unlock;
1097         for (cidx = 0; cidx < 2; cidx++) {
1098                 int devtype = -1;
1099                 if (pcm->streams[cidx].substream == NULL)
1100                         continue;
1101                 switch (cidx) {
1102                 case SNDRV_PCM_STREAM_PLAYBACK:
1103                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1104                         break;
1105                 case SNDRV_PCM_STREAM_CAPTURE:
1106                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1107                         break;
1108                 }
1109                 /* register pcm */
1110                 err = snd_register_device(devtype, pcm->card, pcm->device,
1111                                           &snd_pcm_f_ops[cidx], pcm,
1112                                           &pcm->streams[cidx].dev);
1113                 if (err < 0) {
1114                         list_del_init(&pcm->list);
1115                         goto unlock;
1116                 }
1117
1118                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1119                         snd_pcm_timer_init(substream);
1120         }
1121
1122         pcm_call_notify(pcm, n_register);
1123
1124  unlock:
1125         mutex_unlock(&register_mutex);
1126         return err;
1127 }
1128
1129 static int snd_pcm_dev_disconnect(struct snd_device *device)
1130 {
1131         struct snd_pcm *pcm = device->device_data;
1132         struct snd_pcm_substream *substream;
1133         int cidx;
1134
1135         mutex_lock(&register_mutex);
1136         mutex_lock(&pcm->open_mutex);
1137         wake_up(&pcm->open_wait);
1138         list_del_init(&pcm->list);
1139         for (cidx = 0; cidx < 2; cidx++) {
1140                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1141                         snd_pcm_stream_lock_irq(substream);
1142                         if (substream->runtime) {
1143                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1144                                 wake_up(&substream->runtime->sleep);
1145                                 wake_up(&substream->runtime->tsleep);
1146                         }
1147                         snd_pcm_stream_unlock_irq(substream);
1148                 }
1149         }
1150         if (!pcm->internal) {
1151                 pcm_call_notify(pcm, n_disconnect);
1152         }
1153         for (cidx = 0; cidx < 2; cidx++) {
1154                 if (!pcm->internal)
1155                         snd_unregister_device(&pcm->streams[cidx].dev);
1156                 free_chmap(&pcm->streams[cidx]);
1157         }
1158         mutex_unlock(&pcm->open_mutex);
1159         mutex_unlock(&register_mutex);
1160         return 0;
1161 }
1162
1163 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
1164 /**
1165  * snd_pcm_notify - Add/remove the notify list
1166  * @notify: PCM notify list
1167  * @nfree: 0 = register, 1 = unregister
1168  *
1169  * This adds the given notifier to the global list so that the callback is
1170  * called for each registered PCM devices.  This exists only for PCM OSS
1171  * emulation, so far.
1172  */
1173 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1174 {
1175         struct snd_pcm *pcm;
1176
1177         if (snd_BUG_ON(!notify ||
1178                        !notify->n_register ||
1179                        !notify->n_unregister ||
1180                        !notify->n_disconnect))
1181                 return -EINVAL;
1182         mutex_lock(&register_mutex);
1183         if (nfree) {
1184                 list_del(&notify->list);
1185                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1186                         notify->n_unregister(pcm);
1187         } else {
1188                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1189                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1190                         notify->n_register(pcm);
1191         }
1192         mutex_unlock(&register_mutex);
1193         return 0;
1194 }
1195 EXPORT_SYMBOL(snd_pcm_notify);
1196 #endif /* CONFIG_SND_PCM_OSS */
1197
1198 #ifdef CONFIG_SND_PROC_FS
1199 /*
1200  *  Info interface
1201  */
1202
1203 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1204                               struct snd_info_buffer *buffer)
1205 {
1206         struct snd_pcm *pcm;
1207
1208         mutex_lock(&register_mutex);
1209         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1210                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1211                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1212                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1213                         snd_iprintf(buffer, " : playback %i",
1214                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1215                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1216                         snd_iprintf(buffer, " : capture %i",
1217                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1218                 snd_iprintf(buffer, "\n");
1219         }
1220         mutex_unlock(&register_mutex);
1221 }
1222
1223 static struct snd_info_entry *snd_pcm_proc_entry;
1224
1225 static void snd_pcm_proc_init(void)
1226 {
1227         struct snd_info_entry *entry;
1228
1229         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1230                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1231                 if (snd_info_register(entry) < 0) {
1232                         snd_info_free_entry(entry);
1233                         entry = NULL;
1234                 }
1235         }
1236         snd_pcm_proc_entry = entry;
1237 }
1238
1239 static void snd_pcm_proc_done(void)
1240 {
1241         snd_info_free_entry(snd_pcm_proc_entry);
1242 }
1243
1244 #else /* !CONFIG_SND_PROC_FS */
1245 #define snd_pcm_proc_init()
1246 #define snd_pcm_proc_done()
1247 #endif /* CONFIG_SND_PROC_FS */
1248
1249
1250 /*
1251  *  ENTRY functions
1252  */
1253
1254 static int __init alsa_pcm_init(void)
1255 {
1256         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1257         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1258         snd_pcm_proc_init();
1259         return 0;
1260 }
1261
1262 static void __exit alsa_pcm_exit(void)
1263 {
1264         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1265         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1266         snd_pcm_proc_done();
1267 }
1268
1269 module_init(alsa_pcm_init)
1270 module_exit(alsa_pcm_exit)