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