Pileus Git - ~andy/linux/blob - sound/core/pcm.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.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@suse.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 DECLARE_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 static int snd_pcm_dev_unregister(struct snd_device *device);
  45
  46 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
  47 {
  48         struct list_head *p;
  49         struct snd_pcm *pcm;
  50
  51         list_for_each(p, &snd_pcm_devices) {
  52                 pcm = list_entry(p, struct snd_pcm, list);
  53                 if (pcm->card == card && pcm->device == device)
  54                         return pcm;
  55         }
  56         return NULL;
  57 }
  58
  59 static int snd_pcm_control_ioctl(struct snd_card *card,
  60                                  struct snd_ctl_file *control,
  61                                  unsigned int cmd, unsigned long arg)
  62 {
  63         switch (cmd) {
  64         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  65                 {
  66                         int device;
  67
  68                         if (get_user(device, (int __user *)arg))
  69                                 return -EFAULT;
  70                         down(&register_mutex);
  71                         device = device < 0 ? 0 : device + 1;
  72                         while (device < SNDRV_PCM_DEVICES) {
  73                                 if (snd_pcm_search(card, device))
  74                                         break;
  75                                 device++;
  76                         }
  77                         if (device == SNDRV_PCM_DEVICES)
  78                                 device = -1;
  79                         up(&register_mutex);
  80                         if (put_user(device, (int __user *)arg))
  81                                 return -EFAULT;
  82                         return 0;
  83                 }
  84         case SNDRV_CTL_IOCTL_PCM_INFO:
  85                 {
  86                         struct snd_pcm_info __user *info;
  87                         unsigned int device, subdevice;
  88                         int stream;
  89                         struct snd_pcm *pcm;
  90                         struct snd_pcm_str *pstr;
  91                         struct snd_pcm_substream *substream;
  92                         int err;
  93
  94                         info = (struct snd_pcm_info __user *)arg;
  95                         if (get_user(device, &info->device))
  96                                 return -EFAULT;
  97                         if (get_user(stream, &info->stream))
  98                                 return -EFAULT;
  99                         if (stream < 0 || stream > 1)
 100                                 return -EINVAL;
 101                         if (get_user(subdevice, &info->subdevice))
 102                                 return -EFAULT;
 103                         down(&register_mutex);
 104                         pcm = snd_pcm_search(card, device);
 105                         if (pcm == NULL) {
 106                                 err = -ENXIO;
 107                                 goto _error;
 108                         }
 109                         pstr = &pcm->streams[stream];
 110                         if (pstr->substream_count == 0) {
 111                                 err = -ENOENT;
 112                                 goto _error;
 113                         }
 114                         if (subdevice >= pstr->substream_count) {
 115                                 err = -ENXIO;
 116                                 goto _error;
 117                         }
 118                         for (substream = pstr->substream; substream;
 119                              substream = substream->next)
 120                                 if (substream->number == (int)subdevice)
 121                                         break;
 122                         if (substream == NULL) {
 123                                 err = -ENXIO;
 124                                 goto _error;
 125                         }
 126                         err = snd_pcm_info_user(substream, info);
 127                 _error:
 128                         up(&register_mutex);
 129                         return err;
 130                 }
 131         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 132                 {
 133                         int val;
 134
 135                         if (get_user(val, (int __user *)arg))
 136                                 return -EFAULT;
 137                         control->prefer_pcm_subdevice = val;
 138                         return 0;
 139                 }
 140         }
 141         return -ENOIOCTLCMD;
 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
 154 static char *snd_pcm_stream_names[] = {
 155         STREAM(PLAYBACK),
 156         STREAM(CAPTURE),
 157 };
 158
 159 static char *snd_pcm_state_names[] = {
 160         STATE(OPEN),
 161         STATE(SETUP),
 162         STATE(PREPARED),
 163         STATE(RUNNING),
 164         STATE(XRUN),
 165         STATE(DRAINING),
 166         STATE(PAUSED),
 167         STATE(SUSPENDED),
 168 };
 169
 170 static char *snd_pcm_access_names[] = {
 171         ACCESS(MMAP_INTERLEAVED),
 172         ACCESS(MMAP_NONINTERLEAVED),
 173         ACCESS(MMAP_COMPLEX),
 174         ACCESS(RW_INTERLEAVED),
 175         ACCESS(RW_NONINTERLEAVED),
 176 };
 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 char *snd_pcm_subformat_names[] = {
 220         SUBFORMAT(STD),
 221 };
 222
 223 static char *snd_pcm_tstamp_mode_names[] = {
 224         TSTAMP(NONE),
 225         TSTAMP(MMAP),
 226 };
 227
 228 static const char *snd_pcm_stream_name(int stream)
 229 {
 230         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 231         return snd_pcm_stream_names[stream];
 232 }
 233
 234 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 235 {
 236         return snd_pcm_access_names[access];
 237 }
 238
 239 const char *snd_pcm_format_name(snd_pcm_format_t format)
 240 {
 241         return snd_pcm_format_names[format];
 242 }
 243
 244 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 245 {
 246         return snd_pcm_subformat_names[subformat];
 247 }
 248
 249 static 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
 255 static 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 static const char *snd_pcm_oss_format_name(int format)
 263 {
 264         switch (format) {
 265         case AFMT_MU_LAW:
 266                 return "MU_LAW";
 267         case AFMT_A_LAW:
 268                 return "A_LAW";
 269         case AFMT_IMA_ADPCM:
 270                 return "IMA_ADPCM";
 271         case AFMT_U8:
 272                 return "U8";
 273         case AFMT_S16_LE:
 274                 return "S16_LE";
 275         case AFMT_S16_BE:
 276                 return "S16_BE";
 277         case AFMT_S8:
 278                 return "S8";
 279         case AFMT_U16_LE:
 280                 return "U16_LE";
 281         case AFMT_U16_BE:
 282                 return "U16_BE";
 283         case AFMT_MPEG:
 284                 return "MPEG";
 285         default:
 286                 return "unknown";
 287         }
 288 }
 289 #endif
 290
 291 #ifdef CONFIG_PROC_FS
 292 static 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
 327 static 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
 334 static 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
 341 static 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         snd_pcm_stream_lock_irq(substream);
 351         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 352                 snd_iprintf(buffer, "no setup\n");
 353                 snd_pcm_stream_unlock_irq(substream);
 354                 return;
 355         }
 356         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 357         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 358         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 359         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 360         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 361         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 362         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 363         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 364 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 365         if (substream->oss.oss) {
 366                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 367                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 368                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 369                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 370                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 371                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 372         }
 373 #endif
 374         snd_pcm_stream_unlock_irq(substream);
 375 }
 376
 377 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 378                                                   struct snd_info_buffer *buffer)
 379 {
 380         struct snd_pcm_substream *substream = entry->private_data;
 381         struct snd_pcm_runtime *runtime = substream->runtime;
 382         if (!runtime) {
 383                 snd_iprintf(buffer, "closed\n");
 384                 return;
 385         }
 386         snd_pcm_stream_lock_irq(substream);
 387         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 388                 snd_iprintf(buffer, "no setup\n");
 389                 snd_pcm_stream_unlock_irq(substream);
 390                 return;
 391         }
 392         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 393         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 394         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 395         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 396         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 397         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 398         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 399         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 400         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 401         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 402         snd_pcm_stream_unlock_irq(substream);
 403 }
 404
 405 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 406                                                struct snd_info_buffer *buffer)
 407 {
 408         struct snd_pcm_substream *substream = entry->private_data;
 409         struct snd_pcm_runtime *runtime = substream->runtime;
 410         struct snd_pcm_status status;
 411         int err;
 412         if (!runtime) {
 413                 snd_iprintf(buffer, "closed\n");
 414                 return;
 415         }
 416         memset(&status, 0, sizeof(status));
 417         err = snd_pcm_status(substream, &status);
 418         if (err < 0) {
 419                 snd_iprintf(buffer, "error %d\n", err);
 420                 return;
 421         }
 422         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 423         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 424                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 425         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 426                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 427         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 428         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 429         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 430         snd_iprintf(buffer, "-----\n");
 431         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 432         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 433 }
 434 #endif
 435
 436 #ifdef CONFIG_SND_DEBUG
 437 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 438                                     struct snd_info_buffer *buffer)
 439 {
 440         struct snd_pcm_str *pstr = entry->private_data;
 441         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 442 }
 443
 444 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 445                                      struct snd_info_buffer *buffer)
 446 {
 447         struct snd_pcm_str *pstr = entry->private_data;
 448         char line[64];
 449         if (!snd_info_get_line(buffer, line, sizeof(line)))
 450                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 451 }
 452 #endif
 453
 454 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 455 {
 456         struct snd_pcm *pcm = pstr->pcm;
 457         struct snd_info_entry *entry;
 458         char name[16];
 459
 460         sprintf(name, "pcm%i%c", pcm->device,
 461                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 462         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 463                 return -ENOMEM;
 464         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 465         if (snd_info_register(entry) < 0) {
 466                 snd_info_free_entry(entry);
 467                 return -ENOMEM;
 468         }
 469         pstr->proc_root = entry;
 470
 471         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 472                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
 473                 if (snd_info_register(entry) < 0) {
 474                         snd_info_free_entry(entry);
 475                         entry = NULL;
 476                 }
 477         }
 478         pstr->proc_info_entry = entry;
 479
 480 #ifdef CONFIG_SND_DEBUG
 481         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 482                                                 pstr->proc_root)) != NULL) {
 483                 entry->c.text.read_size = 64;
 484                 entry->c.text.read = snd_pcm_xrun_debug_read;
 485                 entry->c.text.write_size = 64;
 486                 entry->c.text.write = snd_pcm_xrun_debug_write;
 487                 entry->mode |= S_IWUSR;
 488                 entry->private_data = pstr;
 489                 if (snd_info_register(entry) < 0) {
 490                         snd_info_free_entry(entry);
 491                         entry = NULL;
 492                 }
 493         }
 494         pstr->proc_xrun_debug_entry = entry;
 495 #endif
 496         return 0;
 497 }
 498
 499 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 500 {
 501 #ifdef CONFIG_SND_DEBUG
 502         if (pstr->proc_xrun_debug_entry) {
 503                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 504                 pstr->proc_xrun_debug_entry = NULL;
 505         }
 506 #endif
 507         if (pstr->proc_info_entry) {
 508                 snd_info_unregister(pstr->proc_info_entry);
 509                 pstr->proc_info_entry = NULL;
 510         }
 511         if (pstr->proc_root) {
 512                 snd_info_unregister(pstr->proc_root);
 513                 pstr->proc_root = NULL;
 514         }
 515         return 0;
 516 }
 517
 518 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 519 {
 520         struct snd_info_entry *entry;
 521         struct snd_card *card;
 522         char name[16];
 523
 524         card = substream->pcm->card;
 525
 526         sprintf(name, "sub%i", substream->number);
 527         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 528                 return -ENOMEM;
 529         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 530         if (snd_info_register(entry) < 0) {
 531                 snd_info_free_entry(entry);
 532                 return -ENOMEM;
 533         }
 534         substream->proc_root = entry;
 535
 536         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 537                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
 538                 if (snd_info_register(entry) < 0) {
 539                         snd_info_free_entry(entry);
 540                         entry = NULL;
 541                 }
 542         }
 543         substream->proc_info_entry = entry;
 544
 545         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 546                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
 547                 if (snd_info_register(entry) < 0) {
 548                         snd_info_free_entry(entry);
 549                         entry = NULL;
 550                 }
 551         }
 552         substream->proc_hw_params_entry = entry;
 553
 554         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 555                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
 556                 if (snd_info_register(entry) < 0) {
 557                         snd_info_free_entry(entry);
 558                         entry = NULL;
 559                 }
 560         }
 561         substream->proc_sw_params_entry = entry;
 562
 563         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 564                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
 565                 if (snd_info_register(entry) < 0) {
 566                         snd_info_free_entry(entry);
 567                         entry = NULL;
 568                 }
 569         }
 570         substream->proc_status_entry = entry;
 571
 572         return 0;
 573 }
 574
 575 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 576 {
 577         if (substream->proc_info_entry) {
 578                 snd_info_unregister(substream->proc_info_entry);
 579                 substream->proc_info_entry = NULL;
 580         }
 581         if (substream->proc_hw_params_entry) {
 582                 snd_info_unregister(substream->proc_hw_params_entry);
 583                 substream->proc_hw_params_entry = NULL;
 584         }
 585         if (substream->proc_sw_params_entry) {
 586                 snd_info_unregister(substream->proc_sw_params_entry);
 587                 substream->proc_sw_params_entry = NULL;
 588         }
 589         if (substream->proc_status_entry) {
 590                 snd_info_unregister(substream->proc_status_entry);
 591                 substream->proc_status_entry = NULL;
 592         }
 593         if (substream->proc_root) {
 594                 snd_info_unregister(substream->proc_root);
 595                 substream->proc_root = NULL;
 596         }
 597         return 0;
 598 }
 599
 600 /**
 601  * snd_pcm_new_stream - create a new PCM stream
 602  * @pcm: the pcm instance
 603  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 604  * @substream_count: the number of substreams
 605  *
 606  * Creates a new stream for the pcm.
 607  * The corresponding stream on the pcm must have been empty before
 608  * calling this, i.e. zero must be given to the argument of
 609  * snd_pcm_new().
 610  *
 611  * Returns zero if successful, or a negative error code on failure.
 612  */
 613 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 614 {
 615         int idx, err;
 616         struct snd_pcm_str *pstr = &pcm->streams[stream];
 617         struct snd_pcm_substream *substream, *prev;
 618
 619 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 620         init_MUTEX(&pstr->oss.setup_mutex);
 621 #endif
 622         pstr->stream = stream;
 623         pstr->pcm = pcm;
 624         pstr->substream_count = substream_count;
 625         if (substream_count > 0) {
 626                 err = snd_pcm_stream_proc_init(pstr);
 627                 if (err < 0) {
 628                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 629                         return err;
 630                 }
 631         }
 632         prev = NULL;
 633         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 634                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 635                 if (substream == NULL) {
 636                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 637                         return -ENOMEM;
 638                 }
 639                 substream->pcm = pcm;
 640                 substream->pstr = pstr;
 641                 substream->number = idx;
 642                 substream->stream = stream;
 643                 sprintf(substream->name, "subdevice #%i", idx);
 644                 substream->buffer_bytes_max = UINT_MAX;
 645                 if (prev == NULL)
 646                         pstr->substream = substream;
 647                 else
 648                         prev->next = substream;
 649                 err = snd_pcm_substream_proc_init(substream);
 650                 if (err < 0) {
 651                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 652                         kfree(substream);
 653                         return err;
 654                 }
 655                 substream->group = &substream->self_group;
 656                 spin_lock_init(&substream->self_group.lock);
 657                 INIT_LIST_HEAD(&substream->self_group.substreams);
 658                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 659                 spin_lock_init(&substream->timer_lock);
 660                 prev = substream;
 661         }
 662         return 0;
 663 }
 664
 665 /**
 666  * snd_pcm_new - create a new PCM instance
 667  * @card: the card instance
 668  * @id: the id string
 669  * @device: the device index (zero based)
 670  * @playback_count: the number of substreams for playback
 671  * @capture_count: the number of substreams for capture
 672  * @rpcm: the pointer to store the new pcm instance
 673  *
 674  * Creates a new PCM instance.
 675  *
 676  * The pcm operators have to be set afterwards to the new instance
 677  * via snd_pcm_set_ops().
 678  *
 679  * Returns zero if successful, or a negative error code on failure.
 680  */
 681 int snd_pcm_new(struct snd_card *card, char *id, int device,
 682                 int playback_count, int capture_count,
 683                 struct snd_pcm ** rpcm)
 684 {
 685         struct snd_pcm *pcm;
 686         int err;
 687         static struct snd_device_ops ops = {
 688                 .dev_free = snd_pcm_dev_free,
 689                 .dev_register = snd_pcm_dev_register,
 690                 .dev_disconnect = snd_pcm_dev_disconnect,
 691                 .dev_unregister = snd_pcm_dev_unregister
 692         };
 693
 694         snd_assert(rpcm != NULL, return -EINVAL);
 695         *rpcm = NULL;
 696         snd_assert(card != NULL, return -ENXIO);
 697         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 698         if (pcm == NULL) {
 699                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 700                 return -ENOMEM;
 701         }
 702         pcm->card = card;
 703         pcm->device = device;
 704         if (id)
 705                 strlcpy(pcm->id, id, sizeof(pcm->id));
 706         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 707                 snd_pcm_free(pcm);
 708                 return err;
 709         }
 710         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 711                 snd_pcm_free(pcm);
 712                 return err;
 713         }
 714         init_MUTEX(&pcm->open_mutex);
 715         init_waitqueue_head(&pcm->open_wait);
 716         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 717                 snd_pcm_free(pcm);
 718                 return err;
 719         }
 720         *rpcm = pcm;
 721         return 0;
 722 }
 723
 724 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 725 {
 726         struct snd_pcm_substream *substream, *substream_next;
 727 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 728         struct snd_pcm_oss_setup *setup, *setupn;
 729 #endif
 730         substream = pstr->substream;
 731         while (substream) {
 732                 substream_next = substream->next;
 733                 snd_pcm_substream_proc_done(substream);
 734                 kfree(substream);
 735                 substream = substream_next;
 736         }
 737         snd_pcm_stream_proc_done(pstr);
 738 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 739         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 740                 setupn = setup->next;
 741                 kfree(setup->task_name);
 742                 kfree(setup);
 743         }
 744 #endif
 745 }
 746
 747 static int snd_pcm_free(struct snd_pcm *pcm)
 748 {
 749         snd_assert(pcm != NULL, return -ENXIO);
 750         if (pcm->private_free)
 751                 pcm->private_free(pcm);
 752         snd_pcm_lib_preallocate_free_for_all(pcm);
 753         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 754         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 755         kfree(pcm);
 756         return 0;
 757 }
 758
 759 static int snd_pcm_dev_free(struct snd_device *device)
 760 {
 761         struct snd_pcm *pcm = device->device_data;
 762         return snd_pcm_free(pcm);
 763 }
 764
 765 static void snd_pcm_tick_timer_func(unsigned long data)
 766 {
 767         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
 768         snd_pcm_tick_elapsed(substream);
 769 }
 770
 771 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
 772                            struct snd_pcm_substream **rsubstream)
 773 {
 774         struct snd_pcm_str * pstr;
 775         struct snd_pcm_substream *substream;
 776         struct snd_pcm_runtime *runtime;
 777         struct snd_ctl_file *kctl;
 778         struct snd_card *card;
 779         struct list_head *list;
 780         int prefer_subdevice = -1;
 781         size_t size;
 782
 783         snd_assert(rsubstream != NULL, return -EINVAL);
 784         *rsubstream = NULL;
 785         snd_assert(pcm != NULL, return -ENXIO);
 786         pstr = &pcm->streams[stream];
 787         if (pstr->substream == NULL)
 788                 return -ENODEV;
 789
 790         card = pcm->card;
 791         down_read(&card->controls_rwsem);
 792         list_for_each(list, &card->ctl_files) {
 793                 kctl = snd_ctl_file(list);
 794                 if (kctl->pid == current->pid) {
 795                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 796                         break;
 797                 }
 798         }
 799         up_read(&card->controls_rwsem);
 800
 801         if (pstr->substream_count == 0)
 802                 return -ENODEV;
 803         switch (stream) {
 804         case SNDRV_PCM_STREAM_PLAYBACK:
 805                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 806                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 807                                 if (SUBSTREAM_BUSY(substream))
 808                                         return -EAGAIN;
 809                         }
 810                 }
 811                 break;
 812         case SNDRV_PCM_STREAM_CAPTURE:
 813                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 814                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 815                                 if (SUBSTREAM_BUSY(substream))
 816                                         return -EAGAIN;
 817                         }
 818                 }
 819                 break;
 820         default:
 821                 return -EINVAL;
 822         }
 823
 824         if (prefer_subdevice >= 0) {
 825                 for (substream = pstr->substream; substream; substream = substream->next)
 826                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 827                                 goto __ok;
 828         }
 829         for (substream = pstr->substream; substream; substream = substream->next)
 830                 if (!SUBSTREAM_BUSY(substream))
 831                         break;
 832       __ok:
 833         if (substream == NULL)
 834                 return -EAGAIN;
 835
 836         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 837         if (runtime == NULL)
 838                 return -ENOMEM;
 839
 840         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 841         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 842         if (runtime->status == NULL) {
 843                 kfree(runtime);
 844                 return -ENOMEM;
 845         }
 846         memset((void*)runtime->status, 0, size);
 847
 848         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 849         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 850         if (runtime->control == NULL) {
 851                 snd_free_pages((void*)runtime->status,
 852                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 853                 kfree(runtime);
 854                 return -ENOMEM;
 855         }
 856         memset((void*)runtime->control, 0, size);
 857
 858         init_waitqueue_head(&runtime->sleep);
 859         atomic_set(&runtime->mmap_count, 0);
 860         init_timer(&runtime->tick_timer);
 861         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 862         runtime->tick_timer.data = (unsigned long) substream;
 863
 864         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 865
 866         substream->runtime = runtime;
 867         substream->private_data = pcm->private_data;
 868         pstr->substream_opened++;
 869         *rsubstream = substream;
 870         return 0;
 871 }
 872
 873 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
 874 {
 875         struct snd_pcm_runtime *runtime;
 876         substream->file = NULL;
 877         runtime = substream->runtime;
 878         snd_assert(runtime != NULL, return);
 879         if (runtime->private_free != NULL)
 880                 runtime->private_free(runtime);
 881         snd_free_pages((void*)runtime->status,
 882                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 883         snd_free_pages((void*)runtime->control,
 884                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 885         kfree(runtime->hw_constraints.rules);
 886         kfree(runtime);
 887         substream->runtime = NULL;
 888         substream->pstr->substream_opened--;
 889 }
 890
 891 static int snd_pcm_dev_register(struct snd_device *device)
 892 {
 893         int cidx, err;
 894         struct snd_pcm_substream *substream;
 895         struct list_head *list;
 896         char str[16];
 897         struct snd_pcm *pcm = device->device_data;
 898
 899         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 900         down(&register_mutex);
 901         if (snd_pcm_search(pcm->card, pcm->device)) {
 902                 up(&register_mutex);
 903                 return -EBUSY;
 904         }
 905         list_add_tail(&pcm->list, &snd_pcm_devices);
 906         for (cidx = 0; cidx < 2; cidx++) {
 907                 int devtype = -1;
 908                 if (pcm->streams[cidx].substream == NULL)
 909                         continue;
 910                 switch (cidx) {
 911                 case SNDRV_PCM_STREAM_PLAYBACK:
 912                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 913                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 914                         break;
 915                 case SNDRV_PCM_STREAM_CAPTURE:
 916                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 917                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 918                         break;
 919                 }
 920                 if ((err = snd_register_device(devtype, pcm->card,
 921                                                pcm->device,
 922                                                &snd_pcm_f_ops[cidx],
 923                                                pcm, str)) < 0)
 924                 {
 925                         list_del(&pcm->list);
 926                         up(&register_mutex);
 927                         return err;
 928                 }
 929                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 930                         snd_pcm_timer_init(substream);
 931         }
 932         list_for_each(list, &snd_pcm_notify_list) {
 933                 struct snd_pcm_notify *notify;
 934                 notify = list_entry(list, struct snd_pcm_notify, list);
 935                 notify->n_register(pcm);
 936         }
 937         up(&register_mutex);
 938         return 0;
 939 }
 940
 941 static int snd_pcm_dev_disconnect(struct snd_device *device)
 942 {
 943         struct snd_pcm *pcm = device->device_data;
 944         struct list_head *list;
 945         struct snd_pcm_substream *substream;
 946         int cidx;
 947
 948         down(&register_mutex);
 949         list_del_init(&pcm->list);
 950         for (cidx = 0; cidx < 2; cidx++)
 951                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 952                         if (substream->runtime)
 953                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 954         list_for_each(list, &snd_pcm_notify_list) {
 955                 struct snd_pcm_notify *notify;
 956                 notify = list_entry(list, struct snd_pcm_notify, list);
 957                 notify->n_disconnect(pcm);
 958         }
 959         up(&register_mutex);
 960         return 0;
 961 }
 962
 963 static int snd_pcm_dev_unregister(struct snd_device *device)
 964 {
 965         int cidx, devtype;
 966         struct snd_pcm_substream *substream;
 967         struct list_head *list;
 968         struct snd_pcm *pcm = device->device_data;
 969
 970         snd_assert(pcm != NULL, return -ENXIO);
 971         down(&register_mutex);
 972         list_del(&pcm->list);
 973         for (cidx = 0; cidx < 2; cidx++) {
 974                 devtype = -1;
 975                 switch (cidx) {
 976                 case SNDRV_PCM_STREAM_PLAYBACK:
 977                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 978                         break;
 979                 case SNDRV_PCM_STREAM_CAPTURE:
 980                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 981                         break;
 982                 }
 983                 snd_unregister_device(devtype, pcm->card, pcm->device);
 984                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 985                         snd_pcm_timer_done(substream);
 986         }
 987         list_for_each(list, &snd_pcm_notify_list) {
 988                 struct snd_pcm_notify *notify;
 989                 notify = list_entry(list, struct snd_pcm_notify, list);
 990                 notify->n_unregister(pcm);
 991         }
 992         up(&register_mutex);
 993         return snd_pcm_free(pcm);
 994 }
 995
 996 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
 997 {
 998         struct list_head *p;
 999
1000         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1001         down(&register_mutex);
1002         if (nfree) {
1003                 list_del(&notify->list);
1004                 list_for_each(p, &snd_pcm_devices)
1005                         notify->n_unregister(list_entry(p,
1006                                                         struct snd_pcm, list));
1007         } else {
1008                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1009                 list_for_each(p, &snd_pcm_devices)
1010                         notify->n_register(list_entry(p, struct snd_pcm, list));
1011         }
1012         up(&register_mutex);
1013         return 0;
1014 }
1015
1016 /*
1017  *  Info interface
1018  */
1019
1020 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1021                               struct snd_info_buffer *buffer)
1022 {
1023         struct list_head *p;
1024         struct snd_pcm *pcm;
1025
1026         down(&register_mutex);
1027         list_for_each(p, &snd_pcm_devices) {
1028                 pcm = list_entry(p, struct snd_pcm, list);
1029                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1030                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1031                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1032                         snd_iprintf(buffer, " : playback %i",
1033                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1034                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1035                         snd_iprintf(buffer, " : capture %i",
1036                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1037                 snd_iprintf(buffer, "\n");
1038         }
1039         up(&register_mutex);
1040 }
1041
1042 /*
1043  *  ENTRY functions
1044  */
1045
1046 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1047
1048 static int __init alsa_pcm_init(void)
1049 {
1050         struct snd_info_entry *entry;
1051
1052         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1053         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1054         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1055                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128,
1056                                       snd_pcm_proc_read);
1057                 if (snd_info_register(entry) < 0) {
1058                         snd_info_free_entry(entry);
1059                         entry = NULL;
1060                 }
1061         }
1062         snd_pcm_proc_entry = entry;
1063         return 0;
1064 }
1065
1066 static void __exit alsa_pcm_exit(void)
1067 {
1068         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1069         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1070         if (snd_pcm_proc_entry) {
1071                 snd_info_unregister(snd_pcm_proc_entry);
1072                 snd_pcm_proc_entry = NULL;
1073         }
1074 }
1075
1076 module_init(alsa_pcm_init)
1077 module_exit(alsa_pcm_exit)
1078
1079 EXPORT_SYMBOL(snd_pcm_new);
1080 EXPORT_SYMBOL(snd_pcm_new_stream);
1081 EXPORT_SYMBOL(snd_pcm_notify);
1082 EXPORT_SYMBOL(snd_pcm_open_substream);
1083 EXPORT_SYMBOL(snd_pcm_release_substream);
1084 EXPORT_SYMBOL(snd_pcm_format_name);
1085   /* pcm_native.c */
1086 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1087 #ifdef CONFIG_PM
1088 EXPORT_SYMBOL(snd_pcm_suspend);
1089 EXPORT_SYMBOL(snd_pcm_suspend_all);
1090 #endif
1091 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1092 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1093 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1094 EXPORT_SYMBOL(snd_pcm_mmap_data);
1095 #if SNDRV_PCM_INFO_MMAP_IOMEM
1096 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1097 #endif
1098  /* pcm_misc.c */
1099 EXPORT_SYMBOL(snd_pcm_format_signed);
1100 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1101 EXPORT_SYMBOL(snd_pcm_format_linear);
1102 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1103 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1104 EXPORT_SYMBOL(snd_pcm_format_width);
1105 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1106 EXPORT_SYMBOL(snd_pcm_format_size);
1107 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1108 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1109 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1110 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);