git.oblomov.eu Git - linux-2.6/blob - sound/core/pcm.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <linux/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
  32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  34 MODULE_LICENSE("GPL");
  35
  36 static LIST_HEAD(snd_pcm_devices);
  37 static LIST_HEAD(snd_pcm_notify_list);
  38 static DEFINE_MUTEX(register_mutex);
  39
  40 static int snd_pcm_free(struct snd_pcm *pcm);
  41 static int snd_pcm_dev_free(struct snd_device *device);
  42 static int snd_pcm_dev_register(struct snd_device *device);
  43 static int snd_pcm_dev_disconnect(struct snd_device *device);
  44
  45 static 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
  56 static 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
  69 static 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
  87 static 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
 178 static char *snd_pcm_format_names[] = {
 179         FORMAT(S8),
 180         FORMAT(U8),
 181         FORMAT(S16_LE),
 182         FORMAT(S16_BE),
 183         FORMAT(U16_LE),
 184         FORMAT(U16_BE),
 185         FORMAT(S24_LE),
 186         FORMAT(S24_BE),
 187         FORMAT(U24_LE),
 188         FORMAT(U24_BE),
 189         FORMAT(S32_LE),
 190         FORMAT(S32_BE),
 191         FORMAT(U32_LE),
 192         FORMAT(U32_BE),
 193         FORMAT(FLOAT_LE),
 194         FORMAT(FLOAT_BE),
 195         FORMAT(FLOAT64_LE),
 196         FORMAT(FLOAT64_BE),
 197         FORMAT(IEC958_SUBFRAME_LE),
 198         FORMAT(IEC958_SUBFRAME_BE),
 199         FORMAT(MU_LAW),
 200         FORMAT(A_LAW),
 201         FORMAT(IMA_ADPCM),
 202         FORMAT(MPEG),
 203         FORMAT(GSM),
 204         FORMAT(SPECIAL),
 205         FORMAT(S24_3LE),
 206         FORMAT(S24_3BE),
 207         FORMAT(U24_3LE),
 208         FORMAT(U24_3BE),
 209         FORMAT(S20_3LE),
 210         FORMAT(S20_3BE),
 211         FORMAT(U20_3LE),
 212         FORMAT(U20_3BE),
 213         FORMAT(S18_3LE),
 214         FORMAT(S18_3BE),
 215         FORMAT(U18_3LE),
 216         FORMAT(U18_3BE),
 217 };
 218
 219 static const char *snd_pcm_format_name(snd_pcm_format_t format)
 220 {
 221         return snd_pcm_format_names[format];
 222 }
 223
 224 static char *snd_pcm_stream_names[] = {
 225         STREAM(PLAYBACK),
 226         STREAM(CAPTURE),
 227 };
 228
 229 static 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
 240 static 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
 248 static char *snd_pcm_subformat_names[] = {
 249         SUBFORMAT(STD),
 250 };
 251
 252 static char *snd_pcm_tstamp_mode_names[] = {
 253         TSTAMP(NONE),
 254         TSTAMP(ENABLE),
 255 };
 256
 257 static const char *snd_pcm_stream_name(int stream)
 258 {
 259         return snd_pcm_stream_names[stream];
 260 }
 261
 262 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 263 {
 264         return snd_pcm_access_names[access];
 265 }
 266
 267 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 268 {
 269         return snd_pcm_subformat_names[subformat];
 270 }
 271
 272 static const char *snd_pcm_tstamp_mode_name(int mode)
 273 {
 274         return snd_pcm_tstamp_mode_names[mode];
 275 }
 276
 277 static 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
 285 static 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
 314 static 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
 349 static 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
 356 static 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
 363 static 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
 395 static 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
 418 static 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
 449 static 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
 456 static 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
 466 static 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
 509 static 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
 522 static 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
 583 static 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 */
 598 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 599 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 600 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 601 static 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  */
 617 int 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
 677 EXPORT_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  */
 695 int snd_pcm_new(struct snd_card *card, const 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
 739 EXPORT_SYMBOL(snd_pcm_new);
 740
 741 static 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
 765 static 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
 783 static 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
 789 int 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
 907 void 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
 926 static 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
 946 static struct device_attribute pcm_attrs =
 947         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 948
 949 static 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
1009 static 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
1045 int 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
1068 EXPORT_SYMBOL(snd_pcm_notify);
1069
1070 #ifdef CONFIG_PROC_FS
1071 /*
1072  *  Info interface
1073  */
1074
1075 static 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
1095 static struct snd_info_entry *snd_pcm_proc_entry;
1096
1097 static 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
1111 static 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
1126 static 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
1134 static 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
1141 module_init(alsa_pcm_init)
1142 module_exit(alsa_pcm_exit)