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