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/time.h>
  25#include <linux/mutex.h>
  26#include <sound/core.h>
  27#include <sound/minors.h>
  28#include <sound/pcm.h>
  29#include <sound/control.h>
  30#include <sound/info.h>
  31
  32MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  33MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  34MODULE_LICENSE("GPL");
  35
  36static LIST_HEAD(snd_pcm_devices);
  37static LIST_HEAD(snd_pcm_notify_list);
  38static DEFINE_MUTEX(register_mutex);
  39
  40static int snd_pcm_free(struct snd_pcm *pcm);
  41static int snd_pcm_dev_free(struct snd_device *device);
  42static int snd_pcm_dev_register(struct snd_device *device);
  43static int snd_pcm_dev_disconnect(struct snd_device *device);
  44
  45static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
  46{
  47        struct snd_pcm *pcm;
  48
  49        list_for_each_entry(pcm, &snd_pcm_devices, list) {
  50                if (pcm->card == card && pcm->device == device)
  51                        return pcm;
  52        }
  53        return NULL;
  54}
  55
  56static int snd_pcm_next(struct snd_card *card, int device)
  57{
  58        struct snd_pcm *pcm;
  59
  60        list_for_each_entry(pcm, &snd_pcm_devices, list) {
  61                if (pcm->card == card && pcm->device > device)
  62                        return pcm->device;
  63                else if (pcm->card->number > card->number)
  64                        return -1;
  65        }
  66        return -1;
  67}
  68
  69static int snd_pcm_add(struct snd_pcm *newpcm)
  70{
  71        struct snd_pcm *pcm;
  72
  73        list_for_each_entry(pcm, &snd_pcm_devices, list) {
  74                if (pcm->card == newpcm->card && pcm->device == newpcm->device)
  75                        return -EBUSY;
  76                if (pcm->card->number > newpcm->card->number ||
  77                                (pcm->card == newpcm->card &&
  78                                pcm->device > newpcm->device)) {
  79                        list_add(&newpcm->list, pcm->list.prev);
  80                        return 0;
  81                }
  82        }
  83        list_add_tail(&newpcm->list, &snd_pcm_devices);
  84        return 0;
  85}
  86
  87static int snd_pcm_control_ioctl(struct snd_card *card,
  88                                 struct snd_ctl_file *control,
  89                                 unsigned int cmd, unsigned long arg)
  90{
  91        switch (cmd) {
  92        case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  93                {
  94                        int device;
  95
  96                        if (get_user(device, (int __user *)arg))
  97                                return -EFAULT;
  98                        mutex_lock(&register_mutex);
  99                        device = snd_pcm_next(card, device);
 100                        mutex_unlock(&register_mutex);
 101                        if (put_user(device, (int __user *)arg))
 102                                return -EFAULT;
 103                        return 0;
 104                }
 105        case SNDRV_CTL_IOCTL_PCM_INFO:
 106                {
 107                        struct snd_pcm_info __user *info;
 108                        unsigned int device, subdevice;
 109                        int stream;
 110                        struct snd_pcm *pcm;
 111                        struct snd_pcm_str *pstr;
 112                        struct snd_pcm_substream *substream;
 113                        int err;
 114
 115                        info = (struct snd_pcm_info __user *)arg;
 116                        if (get_user(device, &info->device))
 117                                return -EFAULT;
 118                        if (get_user(stream, &info->stream))
 119                                return -EFAULT;
 120                        if (stream < 0 || stream > 1)
 121                                return -EINVAL;
 122                        if (get_user(subdevice, &info->subdevice))
 123                                return -EFAULT;
 124                        mutex_lock(&register_mutex);
 125                        pcm = snd_pcm_get(card, device);
 126                        if (pcm == NULL) {
 127                                err = -ENXIO;
 128                                goto _error;
 129                        }
 130                        pstr = &pcm->streams[stream];
 131                        if (pstr->substream_count == 0) {
 132                                err = -ENOENT;
 133                                goto _error;
 134                        }
 135                        if (subdevice >= pstr->substream_count) {
 136                                err = -ENXIO;
 137                                goto _error;
 138                        }
 139                        for (substream = pstr->substream; substream;
 140                             substream = substream->next)
 141                                if (substream->number == (int)subdevice)
 142                                        break;
 143                        if (substream == NULL) {
 144                                err = -ENXIO;
 145                                goto _error;
 146                        }
 147                        err = snd_pcm_info_user(substream, info);
 148                _error:
 149                        mutex_unlock(&register_mutex);
 150                        return err;
 151                }
 152        case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 153                {
 154                        int val;
 155                        
 156                        if (get_user(val, (int __user *)arg))
 157                                return -EFAULT;
 158                        control->prefer_pcm_subdevice = val;
 159                        return 0;
 160                }
 161        }
 162        return -ENOIOCTLCMD;
 163}
 164
 165#ifdef CONFIG_SND_VERBOSE_PROCFS
 166
 167#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 168#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 169#define READY(v) [SNDRV_PCM_READY_##v] = #v
 170#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 171#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 172#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 173#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 174#define START(v) [SNDRV_PCM_START_##v] = #v
 175#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 176#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 
 177
 178static 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};
 218
 219static const char *snd_pcm_format_name(snd_pcm_format_t format)
 220{
 221        return snd_pcm_format_names[format];
 222}
 223
 224static char *snd_pcm_stream_names[] = {
 225        STREAM(PLAYBACK),
 226        STREAM(CAPTURE),
 227};
 228
 229static char *snd_pcm_state_names[] = {
 230        STATE(OPEN),
 231        STATE(SETUP),
 232        STATE(PREPARED),
 233        STATE(RUNNING),
 234        STATE(XRUN),
 235        STATE(DRAINING),
 236        STATE(PAUSED),
 237        STATE(SUSPENDED),
 238};
 239
 240static char *snd_pcm_access_names[] = {
 241        ACCESS(MMAP_INTERLEAVED), 
 242        ACCESS(MMAP_NONINTERLEAVED),
 243        ACCESS(MMAP_COMPLEX),
 244        ACCESS(RW_INTERLEAVED),
 245        ACCESS(RW_NONINTERLEAVED),
 246};
 247
 248static char *snd_pcm_subformat_names[] = {
 249        SUBFORMAT(STD), 
 250};
 251
 252static char *snd_pcm_tstamp_mode_names[] = {
 253        TSTAMP(NONE),
 254        TSTAMP(ENABLE),
 255};
 256
 257static const char *snd_pcm_stream_name(int stream)
 258{
 259        return snd_pcm_stream_names[stream];
 260}
 261
 262static const char *snd_pcm_access_name(snd_pcm_access_t access)
 263{
 264        return snd_pcm_access_names[access];
 265}
 266
 267static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 268{
 269        return snd_pcm_subformat_names[subformat];
 270}
 271
 272static const char *snd_pcm_tstamp_mode_name(int mode)
 273{
 274        return snd_pcm_tstamp_mode_names[mode];
 275}
 276
 277static const char *snd_pcm_state_name(snd_pcm_state_t state)
 278{
 279        return snd_pcm_state_names[state];
 280}
 281
 282#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 283#include <linux/soundcard.h>
 284
 285static const char *snd_pcm_oss_format_name(int format)
 286{
 287        switch (format) {
 288        case AFMT_MU_LAW:
 289                return "MU_LAW";
 290        case AFMT_A_LAW:
 291                return "A_LAW";
 292        case AFMT_IMA_ADPCM:
 293                return "IMA_ADPCM";
 294        case AFMT_U8:
 295                return "U8";
 296        case AFMT_S16_LE:
 297                return "S16_LE";
 298        case AFMT_S16_BE:
 299                return "S16_BE";
 300        case AFMT_S8:
 301                return "S8";
 302        case AFMT_U16_LE:
 303                return "U16_LE";
 304        case AFMT_U16_BE:
 305                return "U16_BE";
 306        case AFMT_MPEG:
 307                return "MPEG";
 308        default:
 309                return "unknown";
 310        }
 311}
 312#endif
 313
 314static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 315                                   struct snd_info_buffer *buffer)
 316{
 317        struct snd_pcm_info *info;
 318        int err;
 319
 320        if (! substream)
 321                return;
 322
 323        info = kmalloc(sizeof(*info), GFP_KERNEL);
 324        if (! info) {
 325                printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 326                return;
 327        }
 328
 329        err = snd_pcm_info(substream, info);
 330        if (err < 0) {
 331                snd_iprintf(buffer, "error %d\n", err);
 332                kfree(info);
 333                return;
 334        }
 335        snd_iprintf(buffer, "card: %d\n", info->card);
 336        snd_iprintf(buffer, "device: %d\n", info->device);
 337        snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 338        snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 339        snd_iprintf(buffer, "id: %s\n", info->id);
 340        snd_iprintf(buffer, "name: %s\n", info->name);
 341        snd_iprintf(buffer, "subname: %s\n", info->subname);
 342        snd_iprintf(buffer, "class: %d\n", info->dev_class);
 343        snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 344        snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 345        snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 346        kfree(info);
 347}
 348
 349static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 350                                          struct snd_info_buffer *buffer)
 351{
 352        snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 353                               buffer);
 354}
 355
 356static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 357                                             struct snd_info_buffer *buffer)
 358{
 359        snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 360                               buffer);
 361}
 362
 363static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 364                                                  struct snd_info_buffer *buffer)
 365{
 366        struct snd_pcm_substream *substream = entry->private_data;
 367        struct snd_pcm_runtime *runtime = substream->runtime;
 368        if (!runtime) {
 369                snd_iprintf(buffer, "closed\n");
 370                return;
 371        }
 372        if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 373                snd_iprintf(buffer, "no setup\n");
 374                return;
 375        }
 376        snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 377        snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 378        snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 379        snd_iprintf(buffer, "channels: %u\n", runtime->channels);       
 380        snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 
 381        snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);        
 382        snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);        
 383#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 384        if (substream->oss.oss) {
 385                snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 386                snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);       
 387                snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 388                snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 389                snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 390                snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 391        }
 392#endif
 393}
 394
 395static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 396                                                  struct snd_info_buffer *buffer)
 397{
 398        struct snd_pcm_substream *substream = entry->private_data;
 399        struct snd_pcm_runtime *runtime = substream->runtime;
 400        if (!runtime) {
 401                snd_iprintf(buffer, "closed\n");
 402                return;
 403        }
 404        if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 405                snd_iprintf(buffer, "no setup\n");
 406                return;
 407        }
 408        snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 409        snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 410        snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 411        snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 412        snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 413        snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 414        snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 415        snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 416}
 417
 418static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 419                                               struct snd_info_buffer *buffer)
 420{
 421        struct snd_pcm_substream *substream = entry->private_data;
 422        struct snd_pcm_runtime *runtime = substream->runtime;
 423        struct snd_pcm_status status;
 424        int err;
 425        if (!runtime) {
 426                snd_iprintf(buffer, "closed\n");
 427                return;
 428        }
 429        memset(&status, 0, sizeof(status));
 430        err = snd_pcm_status(substream, &status);
 431        if (err < 0) {
 432                snd_iprintf(buffer, "error %d\n", err);
 433                return;
 434        }
 435        snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 436        snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 437                status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 438        snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 439                status.tstamp.tv_sec, status.tstamp.tv_nsec);
 440        snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 441        snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 442        snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 443        snd_iprintf(buffer, "-----\n");
 444        snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 445        snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 446}
 447
 448#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 449static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 450                                    struct snd_info_buffer *buffer)
 451{
 452        struct snd_pcm_str *pstr = entry->private_data;
 453        snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 454}
 455
 456static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 457                                     struct snd_info_buffer *buffer)
 458{
 459        struct snd_pcm_str *pstr = entry->private_data;
 460        char line[64];
 461        if (!snd_info_get_line(buffer, line, sizeof(line)))
 462                pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 463}
 464#endif
 465
 466static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 467{
 468        struct snd_pcm *pcm = pstr->pcm;
 469        struct snd_info_entry *entry;
 470        char name[16];
 471
 472        sprintf(name, "pcm%i%c", pcm->device, 
 473                pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 474        if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 475                return -ENOMEM;
 476        entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 477        if (snd_info_register(entry) < 0) {
 478                snd_info_free_entry(entry);
 479                return -ENOMEM;
 480        }
 481        pstr->proc_root = entry;
 482
 483        if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 484                snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 485                if (snd_info_register(entry) < 0) {
 486                        snd_info_free_entry(entry);
 487                        entry = NULL;
 488                }
 489        }
 490        pstr->proc_info_entry = entry;
 491
 492#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 493        if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 494                                                pstr->proc_root)) != NULL) {
 495                entry->c.text.read = snd_pcm_xrun_debug_read;
 496                entry->c.text.write = snd_pcm_xrun_debug_write;
 497                entry->mode |= S_IWUSR;
 498                entry->private_data = pstr;
 499                if (snd_info_register(entry) < 0) {
 500                        snd_info_free_entry(entry);
 501                        entry = NULL;
 502                }
 503        }
 504        pstr->proc_xrun_debug_entry = entry;
 505#endif
 506        return 0;
 507}
 508
 509static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 510{
 511#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 512        snd_info_free_entry(pstr->proc_xrun_debug_entry);
 513        pstr->proc_xrun_debug_entry = NULL;
 514#endif
 515        snd_info_free_entry(pstr->proc_info_entry);
 516        pstr->proc_info_entry = NULL;
 517        snd_info_free_entry(pstr->proc_root);
 518        pstr->proc_root = NULL;
 519        return 0;
 520}
 521
 522static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 523{
 524        struct snd_info_entry *entry;
 525        struct snd_card *card;
 526        char name[16];
 527
 528        card = substream->pcm->card;
 529
 530        sprintf(name, "sub%i", substream->number);
 531        if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 532                return -ENOMEM;
 533        entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 534        if (snd_info_register(entry) < 0) {
 535                snd_info_free_entry(entry);
 536                return -ENOMEM;
 537        }
 538        substream->proc_root = entry;
 539
 540        if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 541                snd_info_set_text_ops(entry, substream,
 542                                      snd_pcm_substream_proc_info_read);
 543                if (snd_info_register(entry) < 0) {
 544                        snd_info_free_entry(entry);
 545                        entry = NULL;
 546                }
 547        }
 548        substream->proc_info_entry = entry;
 549
 550        if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 551                snd_info_set_text_ops(entry, substream,
 552                                      snd_pcm_substream_proc_hw_params_read);
 553                if (snd_info_register(entry) < 0) {
 554                        snd_info_free_entry(entry);
 555                        entry = NULL;
 556                }
 557        }
 558        substream->proc_hw_params_entry = entry;
 559
 560        if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 561                snd_info_set_text_ops(entry, substream,
 562                                      snd_pcm_substream_proc_sw_params_read);
 563                if (snd_info_register(entry) < 0) {
 564                        snd_info_free_entry(entry);
 565                        entry = NULL;
 566                }
 567        }
 568        substream->proc_sw_params_entry = entry;
 569
 570        if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 571                snd_info_set_text_ops(entry, substream,
 572                                      snd_pcm_substream_proc_status_read);
 573                if (snd_info_register(entry) < 0) {
 574                        snd_info_free_entry(entry);
 575                        entry = NULL;
 576                }
 577        }
 578        substream->proc_status_entry = entry;
 579
 580        return 0;
 581}
 582
 583static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 584{
 585        snd_info_free_entry(substream->proc_info_entry);
 586        substream->proc_info_entry = NULL;
 587        snd_info_free_entry(substream->proc_hw_params_entry);
 588        substream->proc_hw_params_entry = NULL;
 589        snd_info_free_entry(substream->proc_sw_params_entry);
 590        substream->proc_sw_params_entry = NULL;
 591        snd_info_free_entry(substream->proc_status_entry);
 592        substream->proc_status_entry = NULL;
 593        snd_info_free_entry(substream->proc_root);
 594        substream->proc_root = NULL;
 595        return 0;
 596}
 597#else /* !CONFIG_SND_VERBOSE_PROCFS */
 598static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 599static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 600static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 601static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 602#endif /* CONFIG_SND_VERBOSE_PROCFS */
 603
 604/**
 605 * snd_pcm_new_stream - create a new PCM stream
 606 * @pcm: the pcm instance
 607 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 608 * @substream_count: the number of substreams
 609 *
 610 * Creates a new stream for the pcm.
 611 * The corresponding stream on the pcm must have been empty before
 612 * calling this, i.e. zero must be given to the argument of
 613 * snd_pcm_new().
 614 *
 615 * Returns zero if successful, or a negative error code on failure.
 616 */
 617int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 618{
 619        int idx, err;
 620        struct snd_pcm_str *pstr = &pcm->streams[stream];
 621        struct snd_pcm_substream *substream, *prev;
 622
 623#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 624        mutex_init(&pstr->oss.setup_mutex);
 625#endif
 626        pstr->stream = stream;
 627        pstr->pcm = pcm;
 628        pstr->substream_count = substream_count;
 629        if (substream_count > 0) {
 630                err = snd_pcm_stream_proc_init(pstr);
 631                if (err < 0) {
 632                        snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 633                        return err;
 634                }
 635        }
 636        prev = NULL;
 637        for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 638                substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 639                if (substream == NULL) {
 640                        snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 641                        return -ENOMEM;
 642                }
 643                substream->pcm = pcm;
 644                substream->pstr = pstr;
 645                substream->number = idx;
 646                substream->stream = stream;
 647                sprintf(substream->name, "subdevice #%i", idx);
 648                snprintf(substream->latency_id, sizeof(substream->latency_id),
 649                         "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
 650                         (stream ? 'c' : 'p'), idx);
 651                substream->buffer_bytes_max = UINT_MAX;
 652                if (prev == NULL)
 653                        pstr->substream = substream;
 654                else
 655                        prev->next = substream;
 656                err = snd_pcm_substream_proc_init(substream);
 657                if (err < 0) {
 658                        snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 659                        if (prev == NULL)
 660                                pstr->substream = NULL;
 661                        else
 662                                prev->next = NULL;
 663                        kfree(substream);
 664                        return err;
 665                }
 666                substream->group = &substream->self_group;
 667                spin_lock_init(&substream->self_group.lock);
 668                INIT_LIST_HEAD(&substream->self_group.substreams);
 669                list_add_tail(&substream->link_list, &substream->self_group.substreams);
 670                spin_lock_init(&substream->timer_lock);
 671                atomic_set(&substream->mmap_count, 0);
 672                prev = substream;
 673        }
 674        return 0;
 675}                               
 676
 677EXPORT_SYMBOL(snd_pcm_new_stream);
 678
 679/**
 680 * snd_pcm_new - create a new PCM instance
 681 * @card: the card instance
 682 * @id: the id string
 683 * @device: the device index (zero based)
 684 * @playback_count: the number of substreams for playback
 685 * @capture_count: the number of substreams for capture
 686 * @rpcm: the pointer to store the new pcm instance
 687 *
 688 * Creates a new PCM instance.
 689 *
 690 * The pcm operators have to be set afterwards to the new instance
 691 * via snd_pcm_set_ops().
 692 *
 693 * Returns zero if successful, or a negative error code on failure.
 694 */
 695int snd_pcm_new(struct snd_card *card, char *id, int device,
 696                int playback_count, int capture_count,
 697                struct snd_pcm ** rpcm)
 698{
 699        struct snd_pcm *pcm;
 700        int err;
 701        static struct snd_device_ops ops = {
 702                .dev_free = snd_pcm_dev_free,
 703                .dev_register = snd_pcm_dev_register,
 704                .dev_disconnect = snd_pcm_dev_disconnect,
 705        };
 706
 707        if (snd_BUG_ON(!card))
 708                return -ENXIO;
 709        if (rpcm)
 710                *rpcm = NULL;
 711        pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 712        if (pcm == NULL) {
 713                snd_printk(KERN_ERR "Cannot allocate PCM\n");
 714                return -ENOMEM;
 715        }
 716        pcm->card = card;
 717        pcm->device = device;
 718        if (id)
 719                strlcpy(pcm->id, id, sizeof(pcm->id));
 720        if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 721                snd_pcm_free(pcm);
 722                return err;
 723        }
 724        if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 725                snd_pcm_free(pcm);
 726                return err;
 727        }
 728        mutex_init(&pcm->open_mutex);
 729        init_waitqueue_head(&pcm->open_wait);
 730        if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 731                snd_pcm_free(pcm);
 732                return err;
 733        }
 734        if (rpcm)
 735                *rpcm = pcm;
 736        return 0;
 737}
 738
 739EXPORT_SYMBOL(snd_pcm_new);
 740
 741static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 742{
 743        struct snd_pcm_substream *substream, *substream_next;
 744#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 745        struct snd_pcm_oss_setup *setup, *setupn;
 746#endif
 747        substream = pstr->substream;
 748        while (substream) {
 749                substream_next = substream->next;
 750                snd_pcm_timer_done(substream);
 751                snd_pcm_substream_proc_done(substream);
 752                kfree(substream);
 753                substream = substream_next;
 754        }
 755        snd_pcm_stream_proc_done(pstr);
 756#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 757        for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 758                setupn = setup->next;
 759                kfree(setup->task_name);
 760                kfree(setup);
 761        }
 762#endif
 763}
 764
 765static int snd_pcm_free(struct snd_pcm *pcm)
 766{
 767        struct snd_pcm_notify *notify;
 768
 769        if (!pcm)
 770                return 0;
 771        list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 772                notify->n_unregister(pcm);
 773        }
 774        if (pcm->private_free)
 775                pcm->private_free(pcm);
 776        snd_pcm_lib_preallocate_free_for_all(pcm);
 777        snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 778        snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 779        kfree(pcm);
 780        return 0;
 781}
 782
 783static int snd_pcm_dev_free(struct snd_device *device)
 784{
 785        struct snd_pcm *pcm = device->device_data;
 786        return snd_pcm_free(pcm);
 787}
 788
 789int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 790                             struct file *file,
 791                             struct snd_pcm_substream **rsubstream)
 792{
 793        struct snd_pcm_str * pstr;
 794        struct snd_pcm_substream *substream;
 795        struct snd_pcm_runtime *runtime;
 796        struct snd_ctl_file *kctl;
 797        struct snd_card *card;
 798        int prefer_subdevice = -1;
 799        size_t size;
 800
 801        if (snd_BUG_ON(!pcm || !rsubstream))
 802                return -ENXIO;
 803        *rsubstream = NULL;
 804        pstr = &pcm->streams[stream];
 805        if (pstr->substream == NULL || pstr->substream_count == 0)
 806                return -ENODEV;
 807
 808        card = pcm->card;
 809        read_lock(&card->ctl_files_rwlock);
 810        list_for_each_entry(kctl, &card->ctl_files, list) {
 811                if (kctl->pid == current->pid) {
 812                        prefer_subdevice = kctl->prefer_pcm_subdevice;
 813                        if (prefer_subdevice != -1)
 814                                break;
 815                }
 816        }
 817        read_unlock(&card->ctl_files_rwlock);
 818
 819        switch (stream) {
 820        case SNDRV_PCM_STREAM_PLAYBACK:
 821                if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 822                        for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 823                                if (SUBSTREAM_BUSY(substream))
 824                                        return -EAGAIN;
 825                        }
 826                }
 827                break;
 828        case SNDRV_PCM_STREAM_CAPTURE:
 829                if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 830                        for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 831                                if (SUBSTREAM_BUSY(substream))
 832                                        return -EAGAIN;
 833                        }
 834                }
 835                break;
 836        default:
 837                return -EINVAL;
 838        }
 839
 840        if (file->f_flags & O_APPEND) {
 841                if (prefer_subdevice < 0) {
 842                        if (pstr->substream_count > 1)
 843                                return -EINVAL; /* must be unique */
 844                        substream = pstr->substream;
 845                } else {
 846                        for (substream = pstr->substream; substream;
 847                             substream = substream->next)
 848                                if (substream->number == prefer_subdevice)
 849                                        break;
 850                }
 851                if (! substream)
 852                        return -ENODEV;
 853                if (! SUBSTREAM_BUSY(substream))
 854                        return -EBADFD;
 855                substream->ref_count++;
 856                *rsubstream = substream;
 857                return 0;
 858        }
 859
 860        if (prefer_subdevice >= 0) {
 861                for (substream = pstr->substream; substream; substream = substream->next)
 862                        if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 863                                goto __ok;
 864        }
 865        for (substream = pstr->substream; substream; substream = substream->next)
 866                if (!SUBSTREAM_BUSY(substream))
 867                        break;
 868      __ok:
 869        if (substream == NULL)
 870                return -EAGAIN;
 871
 872        runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 873        if (runtime == NULL)
 874                return -ENOMEM;
 875
 876        size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 877        runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 878        if (runtime->status == NULL) {
 879                kfree(runtime);
 880                return -ENOMEM;
 881        }
 882        memset((void*)runtime->status, 0, size);
 883
 884        size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 885        runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 886        if (runtime->control == NULL) {
 887                snd_free_pages((void*)runtime->status,
 888                               PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 889                kfree(runtime);
 890                return -ENOMEM;
 891        }
 892        memset((void*)runtime->control, 0, size);
 893
 894        init_waitqueue_head(&runtime->sleep);
 895
 896        runtime->status->state = SNDRV_PCM_STATE_OPEN;
 897
 898        substream->runtime = runtime;
 899        substream->private_data = pcm->private_data;
 900        substream->ref_count = 1;
 901        substream->f_flags = file->f_flags;
 902        pstr->substream_opened++;
 903        *rsubstream = substream;
 904        return 0;
 905}
 906
 907void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 908{
 909        struct snd_pcm_runtime *runtime;
 910
 911        if (PCM_RUNTIME_CHECK(substream))
 912                return;
 913        runtime = substream->runtime;
 914        if (runtime->private_free != NULL)
 915                runtime->private_free(runtime);
 916        snd_free_pages((void*)runtime->status,
 917                       PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 918        snd_free_pages((void*)runtime->control,
 919                       PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 920        kfree(runtime->hw_constraints.rules);
 921        kfree(runtime);
 922        substream->runtime = NULL;
 923        substream->pstr->substream_opened--;
 924}
 925
 926static ssize_t show_pcm_class(struct device *dev,
 927                              struct device_attribute *attr, char *buf)
 928{
 929        struct snd_pcm *pcm;
 930        const char *str;
 931        static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
 932                [SNDRV_PCM_CLASS_GENERIC] = "generic",
 933                [SNDRV_PCM_CLASS_MULTI] = "multi",
 934                [SNDRV_PCM_CLASS_MODEM] = "modem",
 935                [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
 936        };
 937
 938        if (! (pcm = dev_get_drvdata(dev)) ||
 939            pcm->dev_class > SNDRV_PCM_CLASS_LAST)
 940                str = "none";
 941        else
 942                str = strs[pcm->dev_class];
 943        return snprintf(buf, PAGE_SIZE, "%s\n", str);
 944}
 945
 946static struct device_attribute pcm_attrs =
 947        __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 948
 949static int snd_pcm_dev_register(struct snd_device *device)
 950{
 951        int cidx, err;
 952        struct snd_pcm_substream *substream;
 953        struct snd_pcm_notify *notify;
 954        char str[16];
 955        struct snd_pcm *pcm = device->device_data;
 956        struct device *dev;
 957
 958        if (snd_BUG_ON(!pcm || !device))
 959                return -ENXIO;
 960        mutex_lock(&register_mutex);
 961        err = snd_pcm_add(pcm);
 962        if (err) {
 963                mutex_unlock(&register_mutex);
 964                return err;
 965        }
 966        for (cidx = 0; cidx < 2; cidx++) {
 967                int devtype = -1;
 968                if (pcm->streams[cidx].substream == NULL)
 969                        continue;
 970                switch (cidx) {
 971                case SNDRV_PCM_STREAM_PLAYBACK:
 972                        sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 973                        devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 974                        break;
 975                case SNDRV_PCM_STREAM_CAPTURE:
 976                        sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 977                        devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 978                        break;
 979                }
 980                /* device pointer to use, pcm->dev takes precedence if
 981                 * it is assigned, otherwise fall back to card's device
 982                 * if possible */
 983                dev = pcm->dev;
 984                if (!dev)
 985                        dev = snd_card_get_device_link(pcm->card);
 986                /* register pcm */
 987                err = snd_register_device_for_dev(devtype, pcm->card,
 988                                                  pcm->device,
 989                                                  &snd_pcm_f_ops[cidx],
 990                                                  pcm, str, dev);
 991                if (err < 0) {
 992                        list_del(&pcm->list);
 993                        mutex_unlock(&register_mutex);
 994                        return err;
 995                }
 996                snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
 997                                          &pcm_attrs);
 998                for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 999                        snd_pcm_timer_init(substream);
1000        }
1001
1002        list_for_each_entry(notify, &snd_pcm_notify_list, list)
1003                notify->n_register(pcm);
1004
1005        mutex_unlock(&register_mutex);
1006        return 0;
1007}
1008
1009static int snd_pcm_dev_disconnect(struct snd_device *device)
1010{
1011        struct snd_pcm *pcm = device->device_data;
1012        struct snd_pcm_notify *notify;
1013        struct snd_pcm_substream *substream;
1014        int cidx, devtype;
1015
1016        mutex_lock(&register_mutex);
1017        if (list_empty(&pcm->list))
1018                goto unlock;
1019
1020        list_del_init(&pcm->list);
1021        for (cidx = 0; cidx < 2; cidx++)
1022                for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1023                        if (substream->runtime)
1024                                substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1025        list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1026                notify->n_disconnect(pcm);
1027        }
1028        for (cidx = 0; cidx < 2; cidx++) {
1029                devtype = -1;
1030                switch (cidx) {
1031                case SNDRV_PCM_STREAM_PLAYBACK:
1032                        devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1033                        break;
1034                case SNDRV_PCM_STREAM_CAPTURE:
1035                        devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1036                        break;
1037                }
1038                snd_unregister_device(devtype, pcm->card, pcm->device);
1039        }
1040 unlock:
1041        mutex_unlock(&register_mutex);
1042        return 0;
1043}
1044
1045int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1046{
1047        struct snd_pcm *pcm;
1048
1049        if (snd_BUG_ON(!notify ||
1050                       !notify->n_register ||
1051                       !notify->n_unregister ||
1052                       !notify->n_disconnect))
1053                return -EINVAL;
1054        mutex_lock(&register_mutex);
1055        if (nfree) {
1056                list_del(&notify->list);
1057                list_for_each_entry(pcm, &snd_pcm_devices, list)
1058                        notify->n_unregister(pcm);
1059        } else {
1060                list_add_tail(&notify->list, &snd_pcm_notify_list);
1061                list_for_each_entry(pcm, &snd_pcm_devices, list)
1062                        notify->n_register(pcm);
1063        }
1064        mutex_unlock(&register_mutex);
1065        return 0;
1066}
1067
1068EXPORT_SYMBOL(snd_pcm_notify);
1069
1070#ifdef CONFIG_PROC_FS
1071/*
1072 *  Info interface
1073 */
1074
1075static void snd_pcm_proc_read(struct snd_info_entry *entry,
1076                              struct snd_info_buffer *buffer)
1077{
1078        struct snd_pcm *pcm;
1079
1080        mutex_lock(&register_mutex);
1081        list_for_each_entry(pcm, &snd_pcm_devices, list) {
1082                snd_iprintf(buffer, "%02i-%02i: %s : %s",
1083                            pcm->card->number, pcm->device, pcm->id, pcm->name);
1084                if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1085                        snd_iprintf(buffer, " : playback %i",
1086                                    pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1087                if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1088                        snd_iprintf(buffer, " : capture %i",
1089                                    pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1090                snd_iprintf(buffer, "\n");
1091        }
1092        mutex_unlock(&register_mutex);
1093}
1094
1095static struct snd_info_entry *snd_pcm_proc_entry;
1096
1097static void snd_pcm_proc_init(void)
1098{
1099        struct snd_info_entry *entry;
1100
1101        if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1102                snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1103                if (snd_info_register(entry) < 0) {
1104                        snd_info_free_entry(entry);
1105                        entry = NULL;
1106                }
1107        }
1108        snd_pcm_proc_entry = entry;
1109}
1110
1111static void snd_pcm_proc_done(void)
1112{
1113        snd_info_free_entry(snd_pcm_proc_entry);
1114}
1115
1116#else /* !CONFIG_PROC_FS */
1117#define snd_pcm_proc_init()
1118#define snd_pcm_proc_done()
1119#endif /* CONFIG_PROC_FS */
1120
1121
1122/*
1123 *  ENTRY functions
1124 */
1125
1126static int __init alsa_pcm_init(void)
1127{
1128        snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1129        snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1130        snd_pcm_proc_init();
1131        return 0;
1132}
1133
1134static void __exit alsa_pcm_exit(void)
1135{
1136        snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1137        snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1138        snd_pcm_proc_done();
1139}
1140
1141module_init(alsa_pcm_init)
1142module_exit(alsa_pcm_exit)
1143