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

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <sound/core.h>
  28 #include <sound/minors.h>
  29 #include <sound/pcm.h>
  30 #include <sound/control.h>
  31 #include <sound/info.h>
  32
  33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  35 MODULE_LICENSE("GPL");
  36
  37 static LIST_HEAD(snd_pcm_devices);
  38 static LIST_HEAD(snd_pcm_notify_list);
  39 static DEFINE_MUTEX(register_mutex);
  40
  41 static int snd_pcm_free(struct snd_pcm *pcm);
  42 static int snd_pcm_dev_free(struct snd_device *device);
  43 static int snd_pcm_dev_register(struct snd_device *device);
  44 static int snd_pcm_dev_disconnect(struct snd_device *device);
  45 static int snd_pcm_dev_unregister(struct snd_device *device);
  46
  47 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
  48 {
  49         struct list_head *p;
  50         struct snd_pcm *pcm;
  51
  52         list_for_each(p, &snd_pcm_devices) {
  53                 pcm = list_entry(p, struct snd_pcm, list);
  54                 if (pcm->card == card && pcm->device == device)
  55                         return pcm;
  56         }
  57         return NULL;
  58 }
  59
  60 static int snd_pcm_control_ioctl(struct snd_card *card,
  61                                  struct snd_ctl_file *control,
  62                                  unsigned int cmd, unsigned long arg)
  63 {
  64         switch (cmd) {
  65         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  66                 {
  67                         int device;
  68
  69                         if (get_user(device, (int __user *)arg))
  70                                 return -EFAULT;
  71                         mutex_lock(&register_mutex);
  72                         device = device < 0 ? 0 : device + 1;
  73                         while (device < SNDRV_PCM_DEVICES) {
  74                                 if (snd_pcm_search(card, device))
  75                                         break;
  76                                 device++;
  77                         }
  78                         if (device == SNDRV_PCM_DEVICES)
  79                                 device = -1;
  80                         mutex_unlock(&register_mutex);
  81                         if (put_user(device, (int __user *)arg))
  82                                 return -EFAULT;
  83                         return 0;
  84                 }
  85         case SNDRV_CTL_IOCTL_PCM_INFO:
  86                 {
  87                         struct snd_pcm_info __user *info;
  88                         unsigned int device, subdevice;
  89                         int stream;
  90                         struct snd_pcm *pcm;
  91                         struct snd_pcm_str *pstr;
  92                         struct snd_pcm_substream *substream;
  93                         int err;
  94
  95                         info = (struct snd_pcm_info __user *)arg;
  96                         if (get_user(device, &info->device))
  97                                 return -EFAULT;
  98                         if (get_user(stream, &info->stream))
  99                                 return -EFAULT;
 100                         if (stream < 0 || stream > 1)
 101                                 return -EINVAL;
 102                         if (get_user(subdevice, &info->subdevice))
 103                                 return -EFAULT;
 104                         mutex_lock(&register_mutex);
 105                         pcm = snd_pcm_search(card, device);
 106                         if (pcm == NULL) {
 107                                 err = -ENXIO;
 108                                 goto _error;
 109                         }
 110                         pstr = &pcm->streams[stream];
 111                         if (pstr->substream_count == 0) {
 112                                 err = -ENOENT;
 113                                 goto _error;
 114                         }
 115                         if (subdevice >= pstr->substream_count) {
 116                                 err = -ENXIO;
 117                                 goto _error;
 118                         }
 119                         for (substream = pstr->substream; substream;
 120                              substream = substream->next)
 121                                 if (substream->number == (int)subdevice)
 122                                         break;
 123                         if (substream == NULL) {
 124                                 err = -ENXIO;
 125                                 goto _error;
 126                         }
 127                         err = snd_pcm_info_user(substream, info);
 128                 _error:
 129                         mutex_unlock(&register_mutex);
 130                         return err;
 131                 }
 132         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 133                 {
 134                         int val;
 135
 136                         if (get_user(val, (int __user *)arg))
 137                                 return -EFAULT;
 138                         control->prefer_pcm_subdevice = val;
 139                         return 0;
 140                 }
 141         }
 142         return -ENOIOCTLCMD;
 143 }
 144
 145 #ifdef CONFIG_SND_VERBOSE_PROCFS
 146
 147 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 148 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 149 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 150 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 151 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 152 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 153 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 154 #define START(v) [SNDRV_PCM_START_##v] = #v
 155 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 156 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 157
 158 static char *snd_pcm_format_names[] = {
 159         FORMAT(S8),
 160         FORMAT(U8),
 161         FORMAT(S16_LE),
 162         FORMAT(S16_BE),
 163         FORMAT(U16_LE),
 164         FORMAT(U16_BE),
 165         FORMAT(S24_LE),
 166         FORMAT(S24_BE),
 167         FORMAT(U24_LE),
 168         FORMAT(U24_BE),
 169         FORMAT(S32_LE),
 170         FORMAT(S32_BE),
 171         FORMAT(U32_LE),
 172         FORMAT(U32_BE),
 173         FORMAT(FLOAT_LE),
 174         FORMAT(FLOAT_BE),
 175         FORMAT(FLOAT64_LE),
 176         FORMAT(FLOAT64_BE),
 177         FORMAT(IEC958_SUBFRAME_LE),
 178         FORMAT(IEC958_SUBFRAME_BE),
 179         FORMAT(MU_LAW),
 180         FORMAT(A_LAW),
 181         FORMAT(IMA_ADPCM),
 182         FORMAT(MPEG),
 183         FORMAT(GSM),
 184         FORMAT(SPECIAL),
 185         FORMAT(S24_3LE),
 186         FORMAT(S24_3BE),
 187         FORMAT(U24_3LE),
 188         FORMAT(U24_3BE),
 189         FORMAT(S20_3LE),
 190         FORMAT(S20_3BE),
 191         FORMAT(U20_3LE),
 192         FORMAT(U20_3BE),
 193         FORMAT(S18_3LE),
 194         FORMAT(S18_3BE),
 195         FORMAT(U18_3LE),
 196         FORMAT(U18_3BE),
 197 };
 198
 199 static const char *snd_pcm_format_name(snd_pcm_format_t format)
 200 {
 201         return snd_pcm_format_names[format];
 202 }
 203
 204 static char *snd_pcm_stream_names[] = {
 205         STREAM(PLAYBACK),
 206         STREAM(CAPTURE),
 207 };
 208
 209 static char *snd_pcm_state_names[] = {
 210         STATE(OPEN),
 211         STATE(SETUP),
 212         STATE(PREPARED),
 213         STATE(RUNNING),
 214         STATE(XRUN),
 215         STATE(DRAINING),
 216         STATE(PAUSED),
 217         STATE(SUSPENDED),
 218 };
 219
 220 static char *snd_pcm_access_names[] = {
 221         ACCESS(MMAP_INTERLEAVED),
 222         ACCESS(MMAP_NONINTERLEAVED),
 223         ACCESS(MMAP_COMPLEX),
 224         ACCESS(RW_INTERLEAVED),
 225         ACCESS(RW_NONINTERLEAVED),
 226 };
 227
 228 static char *snd_pcm_subformat_names[] = {
 229         SUBFORMAT(STD),
 230 };
 231
 232 static char *snd_pcm_tstamp_mode_names[] = {
 233         TSTAMP(NONE),
 234         TSTAMP(MMAP),
 235 };
 236
 237 static const char *snd_pcm_stream_name(int stream)
 238 {
 239         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 240         return snd_pcm_stream_names[stream];
 241 }
 242
 243 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 244 {
 245         return snd_pcm_access_names[access];
 246 }
 247
 248 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 249 {
 250         return snd_pcm_subformat_names[subformat];
 251 }
 252
 253 static const char *snd_pcm_tstamp_mode_name(int mode)
 254 {
 255         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 256         return snd_pcm_tstamp_mode_names[mode];
 257 }
 258
 259 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 260 {
 261         return snd_pcm_state_names[state];
 262 }
 263
 264 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 265 #include <linux/soundcard.h>
 266
 267 static const char *snd_pcm_oss_format_name(int format)
 268 {
 269         switch (format) {
 270         case AFMT_MU_LAW:
 271                 return "MU_LAW";
 272         case AFMT_A_LAW:
 273                 return "A_LAW";
 274         case AFMT_IMA_ADPCM:
 275                 return "IMA_ADPCM";
 276         case AFMT_U8:
 277                 return "U8";
 278         case AFMT_S16_LE:
 279                 return "S16_LE";
 280         case AFMT_S16_BE:
 281                 return "S16_BE";
 282         case AFMT_S8:
 283                 return "S8";
 284         case AFMT_U16_LE:
 285                 return "U16_LE";
 286         case AFMT_U16_BE:
 287                 return "U16_BE";
 288         case AFMT_MPEG:
 289                 return "MPEG";
 290         default:
 291                 return "unknown";
 292         }
 293 }
 294 #endif
 295
 296 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 297                                    struct snd_info_buffer *buffer)
 298 {
 299         struct snd_pcm_info *info;
 300         int err;
 301
 302         if (! substream)
 303                 return;
 304
 305         info = kmalloc(sizeof(*info), GFP_KERNEL);
 306         if (! info) {
 307                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 308                 return;
 309         }
 310
 311         err = snd_pcm_info(substream, info);
 312         if (err < 0) {
 313                 snd_iprintf(buffer, "error %d\n", err);
 314                 kfree(info);
 315                 return;
 316         }
 317         snd_iprintf(buffer, "card: %d\n", info->card);
 318         snd_iprintf(buffer, "device: %d\n", info->device);
 319         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 320         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 321         snd_iprintf(buffer, "id: %s\n", info->id);
 322         snd_iprintf(buffer, "name: %s\n", info->name);
 323         snd_iprintf(buffer, "subname: %s\n", info->subname);
 324         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 325         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 326         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 327         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 328         kfree(info);
 329 }
 330
 331 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 332                                           struct snd_info_buffer *buffer)
 333 {
 334         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 335                                buffer);
 336 }
 337
 338 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 339                                              struct snd_info_buffer *buffer)
 340 {
 341         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 342                                buffer);
 343 }
 344
 345 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 346                                                   struct snd_info_buffer *buffer)
 347 {
 348         struct snd_pcm_substream *substream = entry->private_data;
 349         struct snd_pcm_runtime *runtime = substream->runtime;
 350         if (!runtime) {
 351                 snd_iprintf(buffer, "closed\n");
 352                 return;
 353         }
 354         snd_pcm_stream_lock_irq(substream);
 355         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 356                 snd_iprintf(buffer, "no setup\n");
 357                 snd_pcm_stream_unlock_irq(substream);
 358                 return;
 359         }
 360         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 361         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 362         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 363         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 364         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 365         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 366         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 367         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 368 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 369         if (substream->oss.oss) {
 370                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 371                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 372                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 373                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 374                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 375                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 376         }
 377 #endif
 378         snd_pcm_stream_unlock_irq(substream);
 379 }
 380
 381 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 382                                                   struct snd_info_buffer *buffer)
 383 {
 384         struct snd_pcm_substream *substream = entry->private_data;
 385         struct snd_pcm_runtime *runtime = substream->runtime;
 386         if (!runtime) {
 387                 snd_iprintf(buffer, "closed\n");
 388                 return;
 389         }
 390         snd_pcm_stream_lock_irq(substream);
 391         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 392                 snd_iprintf(buffer, "no setup\n");
 393                 snd_pcm_stream_unlock_irq(substream);
 394                 return;
 395         }
 396         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 397         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 398         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 399         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 400         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 401         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 402         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 403         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 404         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 405         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 406         snd_pcm_stream_unlock_irq(substream);
 407 }
 408
 409 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 410                                                struct snd_info_buffer *buffer)
 411 {
 412         struct snd_pcm_substream *substream = entry->private_data;
 413         struct snd_pcm_runtime *runtime = substream->runtime;
 414         struct snd_pcm_status status;
 415         int err;
 416         if (!runtime) {
 417                 snd_iprintf(buffer, "closed\n");
 418                 return;
 419         }
 420         memset(&status, 0, sizeof(status));
 421         err = snd_pcm_status(substream, &status);
 422         if (err < 0) {
 423                 snd_iprintf(buffer, "error %d\n", err);
 424                 return;
 425         }
 426         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 427         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 428                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 429         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 430                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 431         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 432         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 433         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 434         snd_iprintf(buffer, "-----\n");
 435         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 436         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 437 }
 438
 439 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 440 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 441                                     struct snd_info_buffer *buffer)
 442 {
 443         struct snd_pcm_str *pstr = entry->private_data;
 444         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 445 }
 446
 447 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 448                                      struct snd_info_buffer *buffer)
 449 {
 450         struct snd_pcm_str *pstr = entry->private_data;
 451         char line[64];
 452         if (!snd_info_get_line(buffer, line, sizeof(line)))
 453                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 454 }
 455 #endif
 456
 457 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 458 {
 459         struct snd_pcm *pcm = pstr->pcm;
 460         struct snd_info_entry *entry;
 461         char name[16];
 462
 463         sprintf(name, "pcm%i%c", pcm->device,
 464                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 465         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 466                 return -ENOMEM;
 467         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 468         if (snd_info_register(entry) < 0) {
 469                 snd_info_free_entry(entry);
 470                 return -ENOMEM;
 471         }
 472         pstr->proc_root = entry;
 473
 474         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 475                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 476                 if (snd_info_register(entry) < 0) {
 477                         snd_info_free_entry(entry);
 478                         entry = NULL;
 479                 }
 480         }
 481         pstr->proc_info_entry = entry;
 482
 483 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 484         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 485                                                 pstr->proc_root)) != NULL) {
 486                 entry->c.text.read = snd_pcm_xrun_debug_read;
 487                 entry->c.text.write = snd_pcm_xrun_debug_write;
 488                 entry->mode |= S_IWUSR;
 489                 entry->private_data = pstr;
 490                 if (snd_info_register(entry) < 0) {
 491                         snd_info_free_entry(entry);
 492                         entry = NULL;
 493                 }
 494         }
 495         pstr->proc_xrun_debug_entry = entry;
 496 #endif
 497         return 0;
 498 }
 499
 500 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 501 {
 502 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 503         if (pstr->proc_xrun_debug_entry) {
 504                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 505                 pstr->proc_xrun_debug_entry = NULL;
 506         }
 507 #endif
 508         if (pstr->proc_info_entry) {
 509                 snd_info_unregister(pstr->proc_info_entry);
 510                 pstr->proc_info_entry = NULL;
 511         }
 512         if (pstr->proc_root) {
 513                 snd_info_unregister(pstr->proc_root);
 514                 pstr->proc_root = NULL;
 515         }
 516         return 0;
 517 }
 518
 519 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 520 {
 521         struct snd_info_entry *entry;
 522         struct snd_card *card;
 523         char name[16];
 524
 525         card = substream->pcm->card;
 526
 527         sprintf(name, "sub%i", substream->number);
 528         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 529                 return -ENOMEM;
 530         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 531         if (snd_info_register(entry) < 0) {
 532                 snd_info_free_entry(entry);
 533                 return -ENOMEM;
 534         }
 535         substream->proc_root = entry;
 536
 537         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 538                 snd_info_set_text_ops(entry, substream,
 539                                       snd_pcm_substream_proc_info_read);
 540                 if (snd_info_register(entry) < 0) {
 541                         snd_info_free_entry(entry);
 542                         entry = NULL;
 543                 }
 544         }
 545         substream->proc_info_entry = entry;
 546
 547         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 548                 snd_info_set_text_ops(entry, substream,
 549                                       snd_pcm_substream_proc_hw_params_read);
 550                 if (snd_info_register(entry) < 0) {
 551                         snd_info_free_entry(entry);
 552                         entry = NULL;
 553                 }
 554         }
 555         substream->proc_hw_params_entry = entry;
 556
 557         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 558                 snd_info_set_text_ops(entry, substream,
 559                                       snd_pcm_substream_proc_sw_params_read);
 560                 if (snd_info_register(entry) < 0) {
 561                         snd_info_free_entry(entry);
 562                         entry = NULL;
 563                 }
 564         }
 565         substream->proc_sw_params_entry = entry;
 566
 567         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 568                 snd_info_set_text_ops(entry, substream,
 569                                       snd_pcm_substream_proc_status_read);
 570                 if (snd_info_register(entry) < 0) {
 571                         snd_info_free_entry(entry);
 572                         entry = NULL;
 573                 }
 574         }
 575         substream->proc_status_entry = entry;
 576
 577         return 0;
 578 }
 579
 580 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 581 {
 582         if (substream->proc_info_entry) {
 583                 snd_info_unregister(substream->proc_info_entry);
 584                 substream->proc_info_entry = NULL;
 585         }
 586         if (substream->proc_hw_params_entry) {
 587                 snd_info_unregister(substream->proc_hw_params_entry);
 588                 substream->proc_hw_params_entry = NULL;
 589         }
 590         if (substream->proc_sw_params_entry) {
 591                 snd_info_unregister(substream->proc_sw_params_entry);
 592                 substream->proc_sw_params_entry = NULL;
 593         }
 594         if (substream->proc_status_entry) {
 595                 snd_info_unregister(substream->proc_status_entry);
 596                 substream->proc_status_entry = NULL;
 597         }
 598         if (substream->proc_root) {
 599                 snd_info_unregister(substream->proc_root);
 600                 substream->proc_root = NULL;
 601         }
 602         return 0;
 603 }
 604 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 605 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 606 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 607 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 608 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 609 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 610
 611 /**
 612  * snd_pcm_new_stream - create a new PCM stream
 613  * @pcm: the pcm instance
 614  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 615  * @substream_count: the number of substreams
 616  *
 617  * Creates a new stream for the pcm.
 618  * The corresponding stream on the pcm must have been empty before
 619  * calling this, i.e. zero must be given to the argument of
 620  * snd_pcm_new().
 621  *
 622  * Returns zero if successful, or a negative error code on failure.
 623  */
 624 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 625 {
 626         int idx, err;
 627         struct snd_pcm_str *pstr = &pcm->streams[stream];
 628         struct snd_pcm_substream *substream, *prev;
 629
 630 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 631         mutex_init(&pstr->oss.setup_mutex);
 632 #endif
 633         pstr->stream = stream;
 634         pstr->pcm = pcm;
 635         pstr->substream_count = substream_count;
 636         if (substream_count > 0) {
 637                 err = snd_pcm_stream_proc_init(pstr);
 638                 if (err < 0) {
 639                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 640                         return err;
 641                 }
 642         }
 643         prev = NULL;
 644         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 645                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 646                 if (substream == NULL) {
 647                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 648                         return -ENOMEM;
 649                 }
 650                 substream->pcm = pcm;
 651                 substream->pstr = pstr;
 652                 substream->number = idx;
 653                 substream->stream = stream;
 654                 sprintf(substream->name, "subdevice #%i", idx);
 655                 substream->buffer_bytes_max = UINT_MAX;
 656                 if (prev == NULL)
 657                         pstr->substream = substream;
 658                 else
 659                         prev->next = substream;
 660                 err = snd_pcm_substream_proc_init(substream);
 661                 if (err < 0) {
 662                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 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                 spin_lock_init(&substream->timer_lock);
 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, 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                 .dev_unregister = snd_pcm_dev_unregister
 705         };
 706
 707         snd_assert(rpcm != NULL, return -EINVAL);
 708         *rpcm = NULL;
 709         snd_assert(card != NULL, return -ENXIO);
 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         *rpcm = pcm;
 734         return 0;
 735 }
 736
 737 EXPORT_SYMBOL(snd_pcm_new);
 738
 739 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 740 {
 741         struct snd_pcm_substream *substream, *substream_next;
 742 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 743         struct snd_pcm_oss_setup *setup, *setupn;
 744 #endif
 745         substream = pstr->substream;
 746         while (substream) {
 747                 substream_next = substream->next;
 748                 snd_pcm_substream_proc_done(substream);
 749                 kfree(substream);
 750                 substream = substream_next;
 751         }
 752         snd_pcm_stream_proc_done(pstr);
 753 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 754         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 755                 setupn = setup->next;
 756                 kfree(setup->task_name);
 757                 kfree(setup);
 758         }
 759 #endif
 760 }
 761
 762 static int snd_pcm_free(struct snd_pcm *pcm)
 763 {
 764         snd_assert(pcm != NULL, return -ENXIO);
 765         if (pcm->private_free)
 766                 pcm->private_free(pcm);
 767         snd_pcm_lib_preallocate_free_for_all(pcm);
 768         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 769         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 770         kfree(pcm);
 771         return 0;
 772 }
 773
 774 static int snd_pcm_dev_free(struct snd_device *device)
 775 {
 776         struct snd_pcm *pcm = device->device_data;
 777         return snd_pcm_free(pcm);
 778 }
 779
 780 static void snd_pcm_tick_timer_func(unsigned long data)
 781 {
 782         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
 783         snd_pcm_tick_elapsed(substream);
 784 }
 785
 786 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 787                              struct file *file,
 788                              struct snd_pcm_substream **rsubstream)
 789 {
 790         struct snd_pcm_str * pstr;
 791         struct snd_pcm_substream *substream;
 792         struct snd_pcm_runtime *runtime;
 793         struct snd_ctl_file *kctl;
 794         struct snd_card *card;
 795         struct list_head *list;
 796         int prefer_subdevice = -1;
 797         size_t size;
 798
 799         snd_assert(rsubstream != NULL, return -EINVAL);
 800         *rsubstream = NULL;
 801         snd_assert(pcm != NULL, return -ENXIO);
 802         pstr = &pcm->streams[stream];
 803         if (pstr->substream == NULL || pstr->substream_count == 0)
 804                 return -ENODEV;
 805
 806         card = pcm->card;
 807         down_read(&card->controls_rwsem);
 808         list_for_each(list, &card->ctl_files) {
 809                 kctl = snd_ctl_file(list);
 810                 if (kctl->pid == current->pid) {
 811                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 812                         break;
 813                 }
 814         }
 815         up_read(&card->controls_rwsem);
 816
 817         switch (stream) {
 818         case SNDRV_PCM_STREAM_PLAYBACK:
 819                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 820                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 821                                 if (SUBSTREAM_BUSY(substream))
 822                                         return -EAGAIN;
 823                         }
 824                 }
 825                 break;
 826         case SNDRV_PCM_STREAM_CAPTURE:
 827                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 828                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 829                                 if (SUBSTREAM_BUSY(substream))
 830                                         return -EAGAIN;
 831                         }
 832                 }
 833                 break;
 834         default:
 835                 return -EINVAL;
 836         }
 837
 838         if (prefer_subdevice >= 0) {
 839                 for (substream = pstr->substream; substream; substream = substream->next)
 840                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 841                                 goto __ok;
 842         }
 843         for (substream = pstr->substream; substream; substream = substream->next)
 844                 if (!SUBSTREAM_BUSY(substream))
 845                         break;
 846       __ok:
 847         if (substream == NULL)
 848                 return -EAGAIN;
 849
 850         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 851         if (runtime == NULL)
 852                 return -ENOMEM;
 853
 854         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 855         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 856         if (runtime->status == NULL) {
 857                 kfree(runtime);
 858                 return -ENOMEM;
 859         }
 860         memset((void*)runtime->status, 0, size);
 861
 862         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 863         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 864         if (runtime->control == NULL) {
 865                 snd_free_pages((void*)runtime->status,
 866                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 867                 kfree(runtime);
 868                 return -ENOMEM;
 869         }
 870         memset((void*)runtime->control, 0, size);
 871
 872         init_waitqueue_head(&runtime->sleep);
 873         atomic_set(&runtime->mmap_count, 0);
 874         init_timer(&runtime->tick_timer);
 875         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 876         runtime->tick_timer.data = (unsigned long) substream;
 877
 878         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 879
 880         substream->runtime = runtime;
 881         substream->private_data = pcm->private_data;
 882         substream->ffile = file;
 883         pstr->substream_opened++;
 884         *rsubstream = substream;
 885         return 0;
 886 }
 887
 888 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 889 {
 890         struct snd_pcm_runtime *runtime;
 891         substream->file = NULL;
 892         runtime = substream->runtime;
 893         snd_assert(runtime != NULL, return);
 894         if (runtime->private_free != NULL)
 895                 runtime->private_free(runtime);
 896         snd_free_pages((void*)runtime->status,
 897                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 898         snd_free_pages((void*)runtime->control,
 899                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 900         kfree(runtime->hw_constraints.rules);
 901         kfree(runtime);
 902         substream->runtime = NULL;
 903         substream->pstr->substream_opened--;
 904 }
 905
 906 static int snd_pcm_dev_register(struct snd_device *device)
 907 {
 908         int cidx, err;
 909         struct snd_pcm_substream *substream;
 910         struct list_head *list;
 911         char str[16];
 912         struct snd_pcm *pcm = device->device_data;
 913
 914         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 915         mutex_lock(&register_mutex);
 916         if (snd_pcm_search(pcm->card, pcm->device)) {
 917                 mutex_unlock(&register_mutex);
 918                 return -EBUSY;
 919         }
 920         list_add_tail(&pcm->list, &snd_pcm_devices);
 921         for (cidx = 0; cidx < 2; cidx++) {
 922                 int devtype = -1;
 923                 if (pcm->streams[cidx].substream == NULL)
 924                         continue;
 925                 switch (cidx) {
 926                 case SNDRV_PCM_STREAM_PLAYBACK:
 927                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 928                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 929                         break;
 930                 case SNDRV_PCM_STREAM_CAPTURE:
 931                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 932                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 933                         break;
 934                 }
 935                 if ((err = snd_register_device(devtype, pcm->card,
 936                                                pcm->device,
 937                                                &snd_pcm_f_ops[cidx],
 938                                                pcm, str)) < 0)
 939                 {
 940                         list_del(&pcm->list);
 941                         mutex_unlock(&register_mutex);
 942                         return err;
 943                 }
 944                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 945                         snd_pcm_timer_init(substream);
 946         }
 947         list_for_each(list, &snd_pcm_notify_list) {
 948                 struct snd_pcm_notify *notify;
 949                 notify = list_entry(list, struct snd_pcm_notify, list);
 950                 notify->n_register(pcm);
 951         }
 952         mutex_unlock(&register_mutex);
 953         return 0;
 954 }
 955
 956 static int snd_pcm_dev_disconnect(struct snd_device *device)
 957 {
 958         struct snd_pcm *pcm = device->device_data;
 959         struct list_head *list;
 960         struct snd_pcm_substream *substream;
 961         int cidx;
 962
 963         mutex_lock(&register_mutex);
 964         list_del_init(&pcm->list);
 965         for (cidx = 0; cidx < 2; cidx++)
 966                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 967                         if (substream->runtime)
 968                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 969         list_for_each(list, &snd_pcm_notify_list) {
 970                 struct snd_pcm_notify *notify;
 971                 notify = list_entry(list, struct snd_pcm_notify, list);
 972                 notify->n_disconnect(pcm);
 973         }
 974         mutex_unlock(&register_mutex);
 975         return 0;
 976 }
 977
 978 static int snd_pcm_dev_unregister(struct snd_device *device)
 979 {
 980         int cidx, devtype;
 981         struct snd_pcm_substream *substream;
 982         struct list_head *list;
 983         struct snd_pcm *pcm = device->device_data;
 984
 985         snd_assert(pcm != NULL, return -ENXIO);
 986         mutex_lock(&register_mutex);
 987         list_del(&pcm->list);
 988         for (cidx = 0; cidx < 2; cidx++) {
 989                 devtype = -1;
 990                 switch (cidx) {
 991                 case SNDRV_PCM_STREAM_PLAYBACK:
 992                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 993                         break;
 994                 case SNDRV_PCM_STREAM_CAPTURE:
 995                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 996                         break;
 997                 }
 998                 snd_unregister_device(devtype, pcm->card, pcm->device);
 999                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1000                         snd_pcm_timer_done(substream);
1001         }
1002         list_for_each(list, &snd_pcm_notify_list) {
1003                 struct snd_pcm_notify *notify;
1004                 notify = list_entry(list, struct snd_pcm_notify, list);
1005                 notify->n_unregister(pcm);
1006         }
1007         mutex_unlock(&register_mutex);
1008         return snd_pcm_free(pcm);
1009 }
1010
1011 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1012 {
1013         struct list_head *p;
1014
1015         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1016         mutex_lock(&register_mutex);
1017         if (nfree) {
1018                 list_del(&notify->list);
1019                 list_for_each(p, &snd_pcm_devices)
1020                         notify->n_unregister(list_entry(p,
1021                                                         struct snd_pcm, list));
1022         } else {
1023                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1024                 list_for_each(p, &snd_pcm_devices)
1025                         notify->n_register(list_entry(p, struct snd_pcm, list));
1026         }
1027         mutex_unlock(&register_mutex);
1028         return 0;
1029 }
1030
1031 EXPORT_SYMBOL(snd_pcm_notify);
1032
1033 #ifdef CONFIG_PROC_FS
1034 /*
1035  *  Info interface
1036  */
1037
1038 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1039                               struct snd_info_buffer *buffer)
1040 {
1041         struct list_head *p;
1042         struct snd_pcm *pcm;
1043
1044         mutex_lock(&register_mutex);
1045         list_for_each(p, &snd_pcm_devices) {
1046                 pcm = list_entry(p, struct snd_pcm, list);
1047                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1048                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1049                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1050                         snd_iprintf(buffer, " : playback %i",
1051                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1052                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1053                         snd_iprintf(buffer, " : capture %i",
1054                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1055                 snd_iprintf(buffer, "\n");
1056         }
1057         mutex_unlock(&register_mutex);
1058 }
1059
1060 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1061
1062 static void snd_pcm_proc_init(void)
1063 {
1064         struct snd_info_entry *entry;
1065
1066         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1067                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1068                 if (snd_info_register(entry) < 0) {
1069                         snd_info_free_entry(entry);
1070                         entry = NULL;
1071                 }
1072         }
1073         snd_pcm_proc_entry = entry;
1074 }
1075
1076 static void snd_pcm_proc_done(void)
1077 {
1078         if (snd_pcm_proc_entry)
1079                 snd_info_unregister(snd_pcm_proc_entry);
1080 }
1081
1082 #else /* !CONFIG_PROC_FS */
1083 #define snd_pcm_proc_init()
1084 #define snd_pcm_proc_done()
1085 #endif /* CONFIG_PROC_FS */
1086
1087
1088 /*
1089  *  ENTRY functions
1090  */
1091
1092 static int __init alsa_pcm_init(void)
1093 {
1094         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1095         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1096         snd_pcm_proc_init();
1097         return 0;
1098 }
1099
1100 static void __exit alsa_pcm_exit(void)
1101 {
1102         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1103         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1104         snd_pcm_proc_done();
1105 }
1106
1107 module_init(alsa_pcm_init)
1108 module_exit(alsa_pcm_exit)