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