sound/core/pcm.c

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