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(entry->private_data, buffer);
 368 }
 369
 370 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 371                                                   struct snd_info_buffer *buffer)
 372 {
 373         struct snd_pcm_substream *substream = entry->private_data;
 374         struct snd_pcm_runtime *runtime = substream->runtime;
 375         if (!runtime) {
 376                 snd_iprintf(buffer, "closed\n");
 377                 return;
 378         }
 379         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 380                 snd_iprintf(buffer, "no setup\n");
 381                 return;
 382         }
 383         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 384         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 385         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 386         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 387         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 388         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 389         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 390 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 391         if (substream->oss.oss) {
 392                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 393                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 394                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 395                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 396                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 397                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 398         }
 399 #endif
 400 }
 401
 402 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 403                                                   struct snd_info_buffer *buffer)
 404 {
 405         struct snd_pcm_substream *substream = entry->private_data;
 406         struct snd_pcm_runtime *runtime = substream->runtime;
 407         if (!runtime) {
 408                 snd_iprintf(buffer, "closed\n");
 409                 return;
 410         }
 411         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 412                 snd_iprintf(buffer, "no setup\n");
 413                 return;
 414         }
 415         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 416         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 417         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 418         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 419         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 420         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 421         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 422         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 423 }
 424
 425 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 426                                                struct snd_info_buffer *buffer)
 427 {
 428         struct snd_pcm_substream *substream = entry->private_data;
 429         struct snd_pcm_runtime *runtime = substream->runtime;
 430         struct snd_pcm_status status;
 431         int err;
 432         if (!runtime) {
 433                 snd_iprintf(buffer, "closed\n");
 434                 return;
 435         }
 436         memset(&status, 0, sizeof(status));
 437         err = snd_pcm_status(substream, &status);
 438         if (err < 0) {
 439                 snd_iprintf(buffer, "error %d\n", err);
 440                 return;
 441         }
 442         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 443         snd_iprintf(buffer, "owner_pid   : %d\n", pid_vnr(substream->pid));
 444         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 445                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 446         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 447                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 448         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 449         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 450         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 451         snd_iprintf(buffer, "-----\n");
 452         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 453         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 454 }
 455
 456 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 457 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 458                                     struct snd_info_buffer *buffer)
 459 {
 460         struct snd_pcm_str *pstr = entry->private_data;
 461         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 462 }
 463
 464 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 465                                      struct snd_info_buffer *buffer)
 466 {
 467         struct snd_pcm_str *pstr = entry->private_data;
 468         char line[64];
 469         if (!snd_info_get_line(buffer, line, sizeof(line)))
 470                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 471 }
 472 #endif
 473
 474 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 475 {
 476         struct snd_pcm *pcm = pstr->pcm;
 477         struct snd_info_entry *entry;
 478         char name[16];
 479
 480         sprintf(name, "pcm%i%c", pcm->device,
 481                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 482         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 483                 return -ENOMEM;
 484         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 485         if (snd_info_register(entry) < 0) {
 486                 snd_info_free_entry(entry);
 487                 return -ENOMEM;
 488         }
 489         pstr->proc_root = entry;
 490
 491         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 492                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 493                 if (snd_info_register(entry) < 0) {
 494                         snd_info_free_entry(entry);
 495                         entry = NULL;
 496                 }
 497         }
 498         pstr->proc_info_entry = entry;
 499
 500 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 501         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 502                                                 pstr->proc_root)) != NULL) {
 503                 entry->c.text.read = snd_pcm_xrun_debug_read;
 504                 entry->c.text.write = snd_pcm_xrun_debug_write;
 505                 entry->mode |= S_IWUSR;
 506                 entry->private_data = pstr;
 507                 if (snd_info_register(entry) < 0) {
 508                         snd_info_free_entry(entry);
 509                         entry = NULL;
 510                 }
 511         }
 512         pstr->proc_xrun_debug_entry = entry;
 513 #endif
 514         return 0;
 515 }
 516
 517 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 518 {
 519 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 520         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 521         pstr->proc_xrun_debug_entry = NULL;
 522 #endif
 523         snd_info_free_entry(pstr->proc_info_entry);
 524         pstr->proc_info_entry = NULL;
 525         snd_info_free_entry(pstr->proc_root);
 526         pstr->proc_root = NULL;
 527         return 0;
 528 }
 529
 530 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 531 {
 532         struct snd_info_entry *entry;
 533         struct snd_card *card;
 534         char name[16];
 535
 536         card = substream->pcm->card;
 537
 538         sprintf(name, "sub%i", substream->number);
 539         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 540                 return -ENOMEM;
 541         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 542         if (snd_info_register(entry) < 0) {
 543                 snd_info_free_entry(entry);
 544                 return -ENOMEM;
 545         }
 546         substream->proc_root = entry;
 547
 548         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 549                 snd_info_set_text_ops(entry, substream,
 550                                       snd_pcm_substream_proc_info_read);
 551                 if (snd_info_register(entry) < 0) {
 552                         snd_info_free_entry(entry);
 553                         entry = NULL;
 554                 }
 555         }
 556         substream->proc_info_entry = entry;
 557
 558         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 559                 snd_info_set_text_ops(entry, substream,
 560                                       snd_pcm_substream_proc_hw_params_read);
 561                 if (snd_info_register(entry) < 0) {
 562                         snd_info_free_entry(entry);
 563                         entry = NULL;
 564                 }
 565         }
 566         substream->proc_hw_params_entry = entry;
 567
 568         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 569                 snd_info_set_text_ops(entry, substream,
 570                                       snd_pcm_substream_proc_sw_params_read);
 571                 if (snd_info_register(entry) < 0) {
 572                         snd_info_free_entry(entry);
 573                         entry = NULL;
 574                 }
 575         }
 576         substream->proc_sw_params_entry = entry;
 577
 578         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 579                 snd_info_set_text_ops(entry, substream,
 580                                       snd_pcm_substream_proc_status_read);
 581                 if (snd_info_register(entry) < 0) {
 582                         snd_info_free_entry(entry);
 583                         entry = NULL;
 584                 }
 585         }
 586         substream->proc_status_entry = entry;
 587
 588         return 0;
 589 }
 590
 591 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 592 {
 593         snd_info_free_entry(substream->proc_info_entry);
 594         substream->proc_info_entry = NULL;
 595         snd_info_free_entry(substream->proc_hw_params_entry);
 596         substream->proc_hw_params_entry = NULL;
 597         snd_info_free_entry(substream->proc_sw_params_entry);
 598         substream->proc_sw_params_entry = NULL;
 599         snd_info_free_entry(substream->proc_status_entry);
 600         substream->proc_status_entry = NULL;
 601         snd_info_free_entry(substream->proc_root);
 602         substream->proc_root = NULL;
 603         return 0;
 604 }
 605 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 606 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 607 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 608 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 609 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 610 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 611
 612 /**
 613  * snd_pcm_new_stream - create a new PCM stream
 614  * @pcm: the pcm instance
 615  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 616  * @substream_count: the number of substreams
 617  *
 618  * Creates a new stream for the pcm.
 619  * The corresponding stream on the pcm must have been empty before
 620  * calling this, i.e. zero must be given to the argument of
 621  * snd_pcm_new().
 622  *
 623  * Returns zero if successful, or a negative error code on failure.
 624  */
 625 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 626 {
 627         int idx, err;
 628         struct snd_pcm_str *pstr = &pcm->streams[stream];
 629         struct snd_pcm_substream *substream, *prev;
 630
 631 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 632         mutex_init(&pstr->oss.setup_mutex);
 633 #endif
 634         pstr->stream = stream;
 635         pstr->pcm = pcm;
 636         pstr->substream_count = substream_count;
 637         if (substream_count > 0) {
 638                 err = snd_pcm_stream_proc_init(pstr);
 639                 if (err < 0) {
 640                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 641                         return err;
 642                 }
 643         }
 644         prev = NULL;
 645         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 646                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 647                 if (substream == NULL) {
 648                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 649                         return -ENOMEM;
 650                 }
 651                 substream->pcm = pcm;
 652                 substream->pstr = pstr;
 653                 substream->number = idx;
 654                 substream->stream = stream;
 655                 sprintf(substream->name, "subdevice #%i", idx);
 656                 substream->buffer_bytes_max = UINT_MAX;
 657                 if (prev == NULL)
 658                         pstr->substream = substream;
 659                 else
 660                         prev->next = substream;
 661                 err = snd_pcm_substream_proc_init(substream);
 662                 if (err < 0) {
 663                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 664                         if (prev == NULL)
 665                                 pstr->substream = NULL;
 666                         else
 667                                 prev->next = NULL;
 668                         kfree(substream);
 669                         return err;
 670                 }
 671                 substream->group = &substream->self_group;
 672                 spin_lock_init(&substream->self_group.lock);
 673                 INIT_LIST_HEAD(&substream->self_group.substreams);
 674                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 675                 atomic_set(&substream->mmap_count, 0);
 676                 prev = substream;
 677         }
 678         return 0;
 679 }
 680
 681 EXPORT_SYMBOL(snd_pcm_new_stream);
 682
 683 /**
 684  * snd_pcm_new - create a new PCM instance
 685  * @card: the card instance
 686  * @id: the id string
 687  * @device: the device index (zero based)
 688  * @playback_count: the number of substreams for playback
 689  * @capture_count: the number of substreams for capture
 690  * @rpcm: the pointer to store the new pcm instance
 691  *
 692  * Creates a new PCM instance.
 693  *
 694  * The pcm operators have to be set afterwards to the new instance
 695  * via snd_pcm_set_ops().
 696  *
 697  * Returns zero if successful, or a negative error code on failure.
 698  */
 699 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 700                 int playback_count, int capture_count,
 701                 struct snd_pcm ** rpcm)
 702 {
 703         struct snd_pcm *pcm;
 704         int err;
 705         static struct snd_device_ops ops = {
 706                 .dev_free = snd_pcm_dev_free,
 707                 .dev_register = snd_pcm_dev_register,
 708                 .dev_disconnect = snd_pcm_dev_disconnect,
 709         };
 710
 711         if (snd_BUG_ON(!card))
 712                 return -ENXIO;
 713         if (rpcm)
 714                 *rpcm = NULL;
 715         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 716         if (pcm == NULL) {
 717                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 718                 return -ENOMEM;
 719         }
 720         pcm->card = card;
 721         pcm->device = device;
 722         if (id)
 723                 strlcpy(pcm->id, id, sizeof(pcm->id));
 724         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 725                 snd_pcm_free(pcm);
 726                 return err;
 727         }
 728         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 729                 snd_pcm_free(pcm);
 730                 return err;
 731         }
 732         mutex_init(&pcm->open_mutex);
 733         init_waitqueue_head(&pcm->open_wait);
 734         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 735                 snd_pcm_free(pcm);
 736                 return err;
 737         }
 738         if (rpcm)
 739                 *rpcm = pcm;
 740         return 0;
 741 }
 742
 743 EXPORT_SYMBOL(snd_pcm_new);
 744
 745 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 746 {
 747         struct snd_pcm_substream *substream, *substream_next;
 748 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 749         struct snd_pcm_oss_setup *setup, *setupn;
 750 #endif
 751         substream = pstr->substream;
 752         while (substream) {
 753                 substream_next = substream->next;
 754                 snd_pcm_timer_done(substream);
 755                 snd_pcm_substream_proc_done(substream);
 756                 kfree(substream);
 757                 substream = substream_next;
 758         }
 759         snd_pcm_stream_proc_done(pstr);
 760 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 761         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 762                 setupn = setup->next;
 763                 kfree(setup->task_name);
 764                 kfree(setup);
 765         }
 766 #endif
 767 }
 768
 769 static int snd_pcm_free(struct snd_pcm *pcm)
 770 {
 771         struct snd_pcm_notify *notify;
 772
 773         if (!pcm)
 774                 return 0;
 775         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 776                 notify->n_unregister(pcm);
 777         }
 778         if (pcm->private_free)
 779                 pcm->private_free(pcm);
 780         snd_pcm_lib_preallocate_free_for_all(pcm);
 781         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 782         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 783         kfree(pcm);
 784         return 0;
 785 }
 786
 787 static int snd_pcm_dev_free(struct snd_device *device)
 788 {
 789         struct snd_pcm *pcm = device->device_data;
 790         return snd_pcm_free(pcm);
 791 }
 792
 793 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 794                              struct file *file,
 795                              struct snd_pcm_substream **rsubstream)
 796 {
 797         struct snd_pcm_str * pstr;
 798         struct snd_pcm_substream *substream;
 799         struct snd_pcm_runtime *runtime;
 800         struct snd_ctl_file *kctl;
 801         struct snd_card *card;
 802         int prefer_subdevice = -1;
 803         size_t size;
 804
 805         if (snd_BUG_ON(!pcm || !rsubstream))
 806                 return -ENXIO;
 807         *rsubstream = NULL;
 808         pstr = &pcm->streams[stream];
 809         if (pstr->substream == NULL || pstr->substream_count == 0)
 810                 return -ENODEV;
 811
 812         card = pcm->card;
 813         read_lock(&card->ctl_files_rwlock);
 814         list_for_each_entry(kctl, &card->ctl_files, list) {
 815                 if (kctl->pid == task_pid(current)) {
 816                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 817                         if (prefer_subdevice != -1)
 818                                 break;
 819                 }
 820         }
 821         read_unlock(&card->ctl_files_rwlock);
 822
 823         switch (stream) {
 824         case SNDRV_PCM_STREAM_PLAYBACK:
 825                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 826                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 827                                 if (SUBSTREAM_BUSY(substream))
 828                                         return -EAGAIN;
 829                         }
 830                 }
 831                 break;
 832         case SNDRV_PCM_STREAM_CAPTURE:
 833                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 834                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 835                                 if (SUBSTREAM_BUSY(substream))
 836                                         return -EAGAIN;
 837                         }
 838                 }
 839                 break;
 840         default:
 841                 return -EINVAL;
 842         }
 843
 844         if (file->f_flags & O_APPEND) {
 845                 if (prefer_subdevice < 0) {
 846                         if (pstr->substream_count > 1)
 847                                 return -EINVAL; /* must be unique */
 848                         substream = pstr->substream;
 849                 } else {
 850                         for (substream = pstr->substream; substream;
 851                              substream = substream->next)
 852                                 if (substream->number == prefer_subdevice)
 853                                         break;
 854                 }
 855                 if (! substream)
 856                         return -ENODEV;
 857                 if (! SUBSTREAM_BUSY(substream))
 858                         return -EBADFD;
 859                 substream->ref_count++;
 860                 *rsubstream = substream;
 861                 return 0;
 862         }
 863
 864         if (prefer_subdevice >= 0) {
 865                 for (substream = pstr->substream; substream; substream = substream->next)
 866                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 867                                 goto __ok;
 868         }
 869         for (substream = pstr->substream; substream; substream = substream->next)
 870                 if (!SUBSTREAM_BUSY(substream))
 871                         break;
 872       __ok:
 873         if (substream == NULL)
 874                 return -EAGAIN;
 875
 876         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 877         if (runtime == NULL)
 878                 return -ENOMEM;
 879
 880         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 881         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 882         if (runtime->status == NULL) {
 883                 kfree(runtime);
 884                 return -ENOMEM;
 885         }
 886         memset((void*)runtime->status, 0, size);
 887
 888         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 889         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 890         if (runtime->control == NULL) {
 891                 snd_free_pages((void*)runtime->status,
 892                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 893                 kfree(runtime);
 894                 return -ENOMEM;
 895         }
 896         memset((void*)runtime->control, 0, size);
 897
 898         init_waitqueue_head(&runtime->sleep);
 899         init_waitqueue_head(&runtime->tsleep);
 900
 901         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 902
 903         substream->runtime = runtime;
 904         substream->private_data = pcm->private_data;
 905         substream->ref_count = 1;
 906         substream->f_flags = file->f_flags;
 907         substream->pid = get_pid(task_pid(current));
 908         pstr->substream_opened++;
 909         *rsubstream = substream;
 910         return 0;
 911 }
 912
 913 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 914 {
 915         struct snd_pcm_runtime *runtime;
 916
 917         if (PCM_RUNTIME_CHECK(substream))
 918                 return;
 919         runtime = substream->runtime;
 920         if (runtime->private_free != NULL)
 921                 runtime->private_free(runtime);
 922         snd_free_pages((void*)runtime->status,
 923                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 924         snd_free_pages((void*)runtime->control,
 925                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 926         kfree(runtime->hw_constraints.rules);
 927 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 928         if (runtime->hwptr_log)
 929                 kfree(runtime->hwptr_log);
 930 #endif
 931         kfree(runtime);
 932         substream->runtime = NULL;
 933         put_pid(substream->pid);
 934         substream->pid = NULL;
 935         substream->pstr->substream_opened--;
 936 }
 937
 938 static ssize_t show_pcm_class(struct device *dev,
 939                               struct device_attribute *attr, char *buf)
 940 {
 941         struct snd_pcm *pcm;
 942         const char *str;
 943         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
 944                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
 945                 [SNDRV_PCM_CLASS_MULTI] = "multi",
 946                 [SNDRV_PCM_CLASS_MODEM] = "modem",
 947                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
 948         };
 949
 950         if (! (pcm = dev_get_drvdata(dev)) ||
 951             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
 952                 str = "none";
 953         else
 954                 str = strs[pcm->dev_class];
 955         return snprintf(buf, PAGE_SIZE, "%s\n", str);
 956 }
 957
 958 static struct device_attribute pcm_attrs =
 959         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 960
 961 static int snd_pcm_dev_register(struct snd_device *device)
 962 {
 963         int cidx, err;
 964         struct snd_pcm_substream *substream;
 965         struct snd_pcm_notify *notify;
 966         char str[16];
 967         struct snd_pcm *pcm;
 968         struct device *dev;
 969
 970         if (snd_BUG_ON(!device || !device->device_data))
 971                 return -ENXIO;
 972         pcm = device->device_data;
 973         mutex_lock(&register_mutex);
 974         err = snd_pcm_add(pcm);
 975         if (err) {
 976                 mutex_unlock(&register_mutex);
 977                 return err;
 978         }
 979         for (cidx = 0; cidx < 2; cidx++) {
 980                 int devtype = -1;
 981                 if (pcm->streams[cidx].substream == NULL)
 982                         continue;
 983                 switch (cidx) {
 984                 case SNDRV_PCM_STREAM_PLAYBACK:
 985                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 986                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 987                         break;
 988                 case SNDRV_PCM_STREAM_CAPTURE:
 989                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 990                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 991                         break;
 992                 }
 993                 /* device pointer to use, pcm->dev takes precedence if
 994                  * it is assigned, otherwise fall back to card's device
 995                  * if possible */
 996                 dev = pcm->dev;
 997                 if (!dev)
 998                         dev = snd_card_get_device_link(pcm->card);
 999                 /* register pcm */
1000                 err = snd_register_device_for_dev(devtype, pcm->card,
1001                                                   pcm->device,
1002                                                   &snd_pcm_f_ops[cidx],
1003                                                   pcm, str, dev);
1004                 if (err < 0) {
1005                         list_del(&pcm->list);
1006                         mutex_unlock(&register_mutex);
1007                         return err;
1008                 }
1009                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1010                                           &pcm_attrs);
1011                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1012                         snd_pcm_timer_init(substream);
1013         }
1014
1015         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1016                 notify->n_register(pcm);
1017
1018         mutex_unlock(&register_mutex);
1019         return 0;
1020 }
1021
1022 static int snd_pcm_dev_disconnect(struct snd_device *device)
1023 {
1024         struct snd_pcm *pcm = device->device_data;
1025         struct snd_pcm_notify *notify;
1026         struct snd_pcm_substream *substream;
1027         int cidx, devtype;
1028
1029         mutex_lock(&register_mutex);
1030         if (list_empty(&pcm->list))
1031                 goto unlock;
1032
1033         list_del_init(&pcm->list);
1034         for (cidx = 0; cidx < 2; cidx++)
1035                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1036                         if (substream->runtime)
1037                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1038         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1039                 notify->n_disconnect(pcm);
1040         }
1041         for (cidx = 0; cidx < 2; cidx++) {
1042                 devtype = -1;
1043                 switch (cidx) {
1044                 case SNDRV_PCM_STREAM_PLAYBACK:
1045                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1046                         break;
1047                 case SNDRV_PCM_STREAM_CAPTURE:
1048                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1049                         break;
1050                 }
1051                 snd_unregister_device(devtype, pcm->card, pcm->device);
1052         }
1053  unlock:
1054         mutex_unlock(&register_mutex);
1055         return 0;
1056 }
1057
1058 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1059 {
1060         struct snd_pcm *pcm;
1061
1062         if (snd_BUG_ON(!notify ||
1063                        !notify->n_register ||
1064                        !notify->n_unregister ||
1065                        !notify->n_disconnect))
1066                 return -EINVAL;
1067         mutex_lock(&register_mutex);
1068         if (nfree) {
1069                 list_del(&notify->list);
1070                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1071                         notify->n_unregister(pcm);
1072         } else {
1073                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1074                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1075                         notify->n_register(pcm);
1076         }
1077         mutex_unlock(&register_mutex);
1078         return 0;
1079 }
1080
1081 EXPORT_SYMBOL(snd_pcm_notify);
1082
1083 #ifdef CONFIG_PROC_FS
1084 /*
1085  *  Info interface
1086  */
1087
1088 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1089                               struct snd_info_buffer *buffer)
1090 {
1091         struct snd_pcm *pcm;
1092
1093         mutex_lock(&register_mutex);
1094         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1095                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1096                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1097                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1098                         snd_iprintf(buffer, " : playback %i",
1099                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1100                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1101                         snd_iprintf(buffer, " : capture %i",
1102                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1103                 snd_iprintf(buffer, "\n");
1104         }
1105         mutex_unlock(&register_mutex);
1106 }
1107
1108 static struct snd_info_entry *snd_pcm_proc_entry;
1109
1110 static void snd_pcm_proc_init(void)
1111 {
1112         struct snd_info_entry *entry;
1113
1114         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1115                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1116                 if (snd_info_register(entry) < 0) {
1117                         snd_info_free_entry(entry);
1118                         entry = NULL;
1119                 }
1120         }
1121         snd_pcm_proc_entry = entry;
1122 }
1123
1124 static void snd_pcm_proc_done(void)
1125 {
1126         snd_info_free_entry(snd_pcm_proc_entry);
1127 }
1128
1129 #else /* !CONFIG_PROC_FS */
1130 #define snd_pcm_proc_init()
1131 #define snd_pcm_proc_done()
1132 #endif /* CONFIG_PROC_FS */
1133
1134
1135 /*
1136  *  ENTRY functions
1137  */
1138
1139 static int __init alsa_pcm_init(void)
1140 {
1141         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1142         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1143         snd_pcm_proc_init();
1144         return 0;
1145 }
1146
1147 static void __exit alsa_pcm_exit(void)
1148 {
1149         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1150         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1151         snd_pcm_proc_done();
1152 }
1153
1154 module_init(alsa_pcm_init)
1155 module_exit(alsa_pcm_exit)