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