git.oblomov.eu Git - linux-2.6/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 <sound/core.h>
  27 #include <sound/minors.h>
  28 #include <sound/pcm.h>
  29 #include <sound/control.h>
  30 #include <sound/info.h>
  31
  32 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  34 MODULE_LICENSE("GPL");
  35
  36 snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
  37 static LIST_HEAD(snd_pcm_notify_list);
  38 static DECLARE_MUTEX(register_mutex);
  39
  40 static int snd_pcm_free(snd_pcm_t *pcm);
  41 static int snd_pcm_dev_free(snd_device_t *device);
  42 static int snd_pcm_dev_register(snd_device_t *device);
  43 static int snd_pcm_dev_disconnect(snd_device_t *device);
  44 static int snd_pcm_dev_unregister(snd_device_t *device);
  45
  46 static int snd_pcm_control_ioctl(snd_card_t * card,
  47                                  snd_ctl_file_t * control,
  48                                  unsigned int cmd, unsigned long arg)
  49 {
  50         unsigned int tmp;
  51
  52         tmp = card->number * SNDRV_PCM_DEVICES;
  53         switch (cmd) {
  54         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  55                 {
  56                         int device;
  57
  58                         if (get_user(device, (int __user *)arg))
  59                                 return -EFAULT;
  60                         device = device < 0 ? 0 : device + 1;
  61                         while (device < SNDRV_PCM_DEVICES) {
  62                                 if (snd_pcm_devices[tmp + device])
  63                                         break;
  64                                 device++;
  65                         }
  66                         if (device == SNDRV_PCM_DEVICES)
  67                                 device = -1;
  68                         if (put_user(device, (int __user *)arg))
  69                                 return -EFAULT;
  70                         return 0;
  71                 }
  72         case SNDRV_CTL_IOCTL_PCM_INFO:
  73                 {
  74                         snd_pcm_info_t __user *info;
  75                         unsigned int device, subdevice;
  76                         snd_pcm_stream_t stream;
  77                         snd_pcm_t *pcm;
  78                         snd_pcm_str_t *pstr;
  79                         snd_pcm_substream_t *substream;
  80                         info = (snd_pcm_info_t __user *)arg;
  81                         if (get_user(device, &info->device))
  82                                 return -EFAULT;
  83                         if (device >= SNDRV_PCM_DEVICES)
  84                                 return -ENXIO;
  85                         pcm = snd_pcm_devices[tmp + device];
  86                         if (pcm == NULL)
  87                                 return -ENXIO;
  88                         if (get_user(stream, &info->stream))
  89                                 return -EFAULT;
  90                         if (stream < 0 || stream > 1)
  91                                 return -EINVAL;
  92                         pstr = &pcm->streams[stream];
  93                         if (pstr->substream_count == 0)
  94                                 return -ENOENT;
  95                         if (get_user(subdevice, &info->subdevice))
  96                                 return -EFAULT;
  97                         if (subdevice >= pstr->substream_count)
  98                                 return -ENXIO;
  99                         for (substream = pstr->substream; substream; substream = substream->next)
 100                                 if (substream->number == (int)subdevice)
 101                                         break;
 102                         if (substream == NULL)
 103                                 return -ENXIO;
 104                         return snd_pcm_info_user(substream, info);
 105                 }
 106         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 107                 {
 108                         int val;
 109
 110                         if (get_user(val, (int __user *)arg))
 111                                 return -EFAULT;
 112                         control->prefer_pcm_subdevice = val;
 113                         return 0;
 114                 }
 115         }
 116         return -ENOIOCTLCMD;
 117 }
 118 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 119 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 120 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 121 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 122 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 123 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 124 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 125 #define START(v) [SNDRV_PCM_START_##v] = #v
 126 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 127 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 128
 129 static char *snd_pcm_stream_names[] = {
 130         STREAM(PLAYBACK),
 131         STREAM(CAPTURE),
 132 };
 133
 134 static char *snd_pcm_state_names[] = {
 135         STATE(OPEN),
 136         STATE(SETUP),
 137         STATE(PREPARED),
 138         STATE(RUNNING),
 139         STATE(XRUN),
 140         STATE(DRAINING),
 141         STATE(PAUSED),
 142         STATE(SUSPENDED),
 143 };
 144
 145 static char *snd_pcm_access_names[] = {
 146         ACCESS(MMAP_INTERLEAVED),
 147         ACCESS(MMAP_NONINTERLEAVED),
 148         ACCESS(MMAP_COMPLEX),
 149         ACCESS(RW_INTERLEAVED),
 150         ACCESS(RW_NONINTERLEAVED),
 151 };
 152
 153 static char *snd_pcm_format_names[] = {
 154         FORMAT(S8),
 155         FORMAT(U8),
 156         FORMAT(S16_LE),
 157         FORMAT(S16_BE),
 158         FORMAT(U16_LE),
 159         FORMAT(U16_BE),
 160         FORMAT(S24_LE),
 161         FORMAT(S24_BE),
 162         FORMAT(U24_LE),
 163         FORMAT(U24_BE),
 164         FORMAT(S32_LE),
 165         FORMAT(S32_BE),
 166         FORMAT(U32_LE),
 167         FORMAT(U32_BE),
 168         FORMAT(FLOAT_LE),
 169         FORMAT(FLOAT_BE),
 170         FORMAT(FLOAT64_LE),
 171         FORMAT(FLOAT64_BE),
 172         FORMAT(IEC958_SUBFRAME_LE),
 173         FORMAT(IEC958_SUBFRAME_BE),
 174         FORMAT(MU_LAW),
 175         FORMAT(A_LAW),
 176         FORMAT(IMA_ADPCM),
 177         FORMAT(MPEG),
 178         FORMAT(GSM),
 179         FORMAT(SPECIAL),
 180         FORMAT(S24_3LE),
 181         FORMAT(S24_3BE),
 182         FORMAT(U24_3LE),
 183         FORMAT(U24_3BE),
 184         FORMAT(S20_3LE),
 185         FORMAT(S20_3BE),
 186         FORMAT(U20_3LE),
 187         FORMAT(U20_3BE),
 188         FORMAT(S18_3LE),
 189         FORMAT(S18_3BE),
 190         FORMAT(U18_3LE),
 191         FORMAT(U18_3BE),
 192 };
 193
 194 static char *snd_pcm_subformat_names[] = {
 195         SUBFORMAT(STD),
 196 };
 197
 198 static char *snd_pcm_tstamp_mode_names[] = {
 199         TSTAMP(NONE),
 200         TSTAMP(MMAP),
 201 };
 202
 203 static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
 204 {
 205         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 206         return snd_pcm_stream_names[stream];
 207 }
 208
 209 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 210 {
 211         snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
 212         return snd_pcm_access_names[access];
 213 }
 214
 215 const char *snd_pcm_format_name(snd_pcm_format_t format)
 216 {
 217         snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
 218         return snd_pcm_format_names[format];
 219 }
 220
 221 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 222 {
 223         snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
 224         return snd_pcm_subformat_names[subformat];
 225 }
 226
 227 static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
 228 {
 229         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 230         return snd_pcm_tstamp_mode_names[mode];
 231 }
 232
 233 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 234 {
 235         snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
 236         return snd_pcm_state_names[state];
 237 }
 238
 239 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 240 #include <linux/soundcard.h>
 241 static const char *snd_pcm_oss_format_name(int format)
 242 {
 243         switch (format) {
 244         case AFMT_MU_LAW:
 245                 return "MU_LAW";
 246         case AFMT_A_LAW:
 247                 return "A_LAW";
 248         case AFMT_IMA_ADPCM:
 249                 return "IMA_ADPCM";
 250         case AFMT_U8:
 251                 return "U8";
 252         case AFMT_S16_LE:
 253                 return "S16_LE";
 254         case AFMT_S16_BE:
 255                 return "S16_BE";
 256         case AFMT_S8:
 257                 return "S8";
 258         case AFMT_U16_LE:
 259                 return "U16_LE";
 260         case AFMT_U16_BE:
 261                 return "U16_BE";
 262         case AFMT_MPEG:
 263                 return "MPEG";
 264         default:
 265                 return "unknown";
 266         }
 267 }
 268 #endif
 269
 270 #ifdef CONFIG_PROC_FS
 271 static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
 272 {
 273         snd_pcm_info_t *info;
 274         int err;
 275
 276         if (! substream)
 277                 return;
 278
 279         info = kmalloc(sizeof(*info), GFP_KERNEL);
 280         if (! info) {
 281                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 282                 return;
 283         }
 284
 285         err = snd_pcm_info(substream, info);
 286         if (err < 0) {
 287                 snd_iprintf(buffer, "error %d\n", err);
 288                 kfree(info);
 289                 return;
 290         }
 291         snd_iprintf(buffer, "card: %d\n", info->card);
 292         snd_iprintf(buffer, "device: %d\n", info->device);
 293         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 294         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 295         snd_iprintf(buffer, "id: %s\n", info->id);
 296         snd_iprintf(buffer, "name: %s\n", info->name);
 297         snd_iprintf(buffer, "subname: %s\n", info->subname);
 298         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 299         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 300         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 301         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 302         kfree(info);
 303 }
 304
 305 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 306 {
 307         snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
 308 }
 309
 310 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 311 {
 312         snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
 313 }
 314
 315 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 316 {
 317         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 318         snd_pcm_runtime_t *runtime = substream->runtime;
 319         if (!runtime) {
 320                 snd_iprintf(buffer, "closed\n");
 321                 return;
 322         }
 323         snd_pcm_stream_lock_irq(substream);
 324         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 325                 snd_iprintf(buffer, "no setup\n");
 326                 snd_pcm_stream_unlock_irq(substream);
 327                 return;
 328         }
 329         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 330         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 331         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 332         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 333         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 334         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 335         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 336         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 337 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 338         if (substream->oss.oss) {
 339                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 340                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 341                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 342                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 343                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 344                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 345         }
 346 #endif
 347         snd_pcm_stream_unlock_irq(substream);
 348 }
 349
 350 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 351 {
 352         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 353         snd_pcm_runtime_t *runtime = substream->runtime;
 354         if (!runtime) {
 355                 snd_iprintf(buffer, "closed\n");
 356                 return;
 357         }
 358         snd_pcm_stream_lock_irq(substream);
 359         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 360                 snd_iprintf(buffer, "no setup\n");
 361                 snd_pcm_stream_unlock_irq(substream);
 362                 return;
 363         }
 364         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 365         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 366         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 367         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 368         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 369         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 370         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 371         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 372         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 373         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 374         snd_pcm_stream_unlock_irq(substream);
 375 }
 376
 377 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 378 {
 379         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 380         snd_pcm_runtime_t *runtime = substream->runtime;
 381         snd_pcm_status_t status;
 382         int err;
 383         if (!runtime) {
 384                 snd_iprintf(buffer, "closed\n");
 385                 return;
 386         }
 387         memset(&status, 0, sizeof(status));
 388         err = snd_pcm_status(substream, &status);
 389         if (err < 0) {
 390                 snd_iprintf(buffer, "error %d\n", err);
 391                 return;
 392         }
 393         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 394         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 395                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 396         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 397                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 398         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 399         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 400         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 401         snd_iprintf(buffer, "-----\n");
 402         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 403         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 404 }
 405 #endif
 406
 407 #ifdef CONFIG_SND_DEBUG
 408 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 409 {
 410         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
 411         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 412 }
 413
 414 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 415 {
 416         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
 417         char line[64];
 418         if (!snd_info_get_line(buffer, line, sizeof(line)))
 419                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 420 }
 421 #endif
 422
 423 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
 424 {
 425         snd_pcm_t *pcm = pstr->pcm;
 426         snd_info_entry_t *entry;
 427         char name[16];
 428
 429         sprintf(name, "pcm%i%c", pcm->device,
 430                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 431         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 432                 return -ENOMEM;
 433         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 434         if (snd_info_register(entry) < 0) {
 435                 snd_info_free_entry(entry);
 436                 return -ENOMEM;
 437         }
 438         pstr->proc_root = entry;
 439
 440         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 441                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
 442                 if (snd_info_register(entry) < 0) {
 443                         snd_info_free_entry(entry);
 444                         entry = NULL;
 445                 }
 446         }
 447         pstr->proc_info_entry = entry;
 448
 449 #ifdef CONFIG_SND_DEBUG
 450         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
 451                 entry->c.text.read_size = 64;
 452                 entry->c.text.read = snd_pcm_xrun_debug_read;
 453                 entry->c.text.write_size = 64;
 454                 entry->c.text.write = snd_pcm_xrun_debug_write;
 455                 entry->mode |= S_IWUSR;
 456                 entry->private_data = pstr;
 457                 if (snd_info_register(entry) < 0) {
 458                         snd_info_free_entry(entry);
 459                         entry = NULL;
 460                 }
 461         }
 462         pstr->proc_xrun_debug_entry = entry;
 463 #endif
 464         return 0;
 465 }
 466
 467 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
 468 {
 469 #ifdef CONFIG_SND_DEBUG
 470         if (pstr->proc_xrun_debug_entry) {
 471                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 472                 pstr->proc_xrun_debug_entry = NULL;
 473         }
 474 #endif
 475         if (pstr->proc_info_entry) {
 476                 snd_info_unregister(pstr->proc_info_entry);
 477                 pstr->proc_info_entry = NULL;
 478         }
 479         if (pstr->proc_root) {
 480                 snd_info_unregister(pstr->proc_root);
 481                 pstr->proc_root = NULL;
 482         }
 483         return 0;
 484 }
 485
 486 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
 487 {
 488         snd_info_entry_t *entry;
 489         snd_card_t *card;
 490         char name[16];
 491
 492         card = substream->pcm->card;
 493
 494         sprintf(name, "sub%i", substream->number);
 495         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 496                 return -ENOMEM;
 497         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 498         if (snd_info_register(entry) < 0) {
 499                 snd_info_free_entry(entry);
 500                 return -ENOMEM;
 501         }
 502         substream->proc_root = entry;
 503
 504         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 505                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
 506                 if (snd_info_register(entry) < 0) {
 507                         snd_info_free_entry(entry);
 508                         entry = NULL;
 509                 }
 510         }
 511         substream->proc_info_entry = entry;
 512
 513         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 514                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
 515                 if (snd_info_register(entry) < 0) {
 516                         snd_info_free_entry(entry);
 517                         entry = NULL;
 518                 }
 519         }
 520         substream->proc_hw_params_entry = entry;
 521
 522         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 523                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
 524                 if (snd_info_register(entry) < 0) {
 525                         snd_info_free_entry(entry);
 526                         entry = NULL;
 527                 }
 528         }
 529         substream->proc_sw_params_entry = entry;
 530
 531         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 532                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
 533                 if (snd_info_register(entry) < 0) {
 534                         snd_info_free_entry(entry);
 535                         entry = NULL;
 536                 }
 537         }
 538         substream->proc_status_entry = entry;
 539
 540         return 0;
 541 }
 542
 543 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
 544 {
 545         if (substream->proc_info_entry) {
 546                 snd_info_unregister(substream->proc_info_entry);
 547                 substream->proc_info_entry = NULL;
 548         }
 549         if (substream->proc_hw_params_entry) {
 550                 snd_info_unregister(substream->proc_hw_params_entry);
 551                 substream->proc_hw_params_entry = NULL;
 552         }
 553         if (substream->proc_sw_params_entry) {
 554                 snd_info_unregister(substream->proc_sw_params_entry);
 555                 substream->proc_sw_params_entry = NULL;
 556         }
 557         if (substream->proc_status_entry) {
 558                 snd_info_unregister(substream->proc_status_entry);
 559                 substream->proc_status_entry = NULL;
 560         }
 561         if (substream->proc_root) {
 562                 snd_info_unregister(substream->proc_root);
 563                 substream->proc_root = NULL;
 564         }
 565         return 0;
 566 }
 567
 568 /**
 569  * snd_pcm_new_stream - create a new PCM stream
 570  * @pcm: the pcm instance
 571  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 572  * @substream_count: the number of substreams
 573  *
 574  * Creates a new stream for the pcm.
 575  * The corresponding stream on the pcm must have been empty before
 576  * calling this, i.e. zero must be given to the argument of
 577  * snd_pcm_new().
 578  *
 579  * Returns zero if successful, or a negative error code on failure.
 580  */
 581 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
 582 {
 583         int idx, err;
 584         snd_pcm_str_t *pstr = &pcm->streams[stream];
 585         snd_pcm_substream_t *substream, *prev;
 586
 587 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 588         init_MUTEX(&pstr->oss.setup_mutex);
 589 #endif
 590         pstr->stream = stream;
 591         pstr->pcm = pcm;
 592         pstr->substream_count = substream_count;
 593         pstr->reg = &snd_pcm_reg[stream];
 594         if (substream_count > 0) {
 595                 err = snd_pcm_stream_proc_init(pstr);
 596                 if (err < 0)
 597                         return err;
 598         }
 599         prev = NULL;
 600         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 601                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 602                 if (substream == NULL)
 603                         return -ENOMEM;
 604                 substream->pcm = pcm;
 605                 substream->pstr = pstr;
 606                 substream->number = idx;
 607                 substream->stream = stream;
 608                 sprintf(substream->name, "subdevice #%i", idx);
 609                 substream->buffer_bytes_max = UINT_MAX;
 610                 if (prev == NULL)
 611                         pstr->substream = substream;
 612                 else
 613                         prev->next = substream;
 614                 err = snd_pcm_substream_proc_init(substream);
 615                 if (err < 0) {
 616                         kfree(substream);
 617                         return err;
 618                 }
 619                 substream->group = &substream->self_group;
 620                 spin_lock_init(&substream->self_group.lock);
 621                 INIT_LIST_HEAD(&substream->self_group.substreams);
 622                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 623                 spin_lock_init(&substream->timer_lock);
 624                 prev = substream;
 625         }
 626         return 0;
 627 }
 628
 629 /**
 630  * snd_pcm_new - create a new PCM instance
 631  * @card: the card instance
 632  * @id: the id string
 633  * @device: the device index (zero based)
 634  * @playback_count: the number of substreams for playback
 635  * @capture_count: the number of substreams for capture
 636  * @rpcm: the pointer to store the new pcm instance
 637  *
 638  * Creates a new PCM instance.
 639  *
 640  * The pcm operators have to be set afterwards to the new instance
 641  * via snd_pcm_set_ops().
 642  *
 643  * Returns zero if successful, or a negative error code on failure.
 644  */
 645 int snd_pcm_new(snd_card_t * card, char *id, int device,
 646                 int playback_count, int capture_count,
 647                 snd_pcm_t ** rpcm)
 648 {
 649         snd_pcm_t *pcm;
 650         int err;
 651         static snd_device_ops_t ops = {
 652                 .dev_free = snd_pcm_dev_free,
 653                 .dev_register = snd_pcm_dev_register,
 654                 .dev_disconnect = snd_pcm_dev_disconnect,
 655                 .dev_unregister = snd_pcm_dev_unregister
 656         };
 657
 658         snd_assert(rpcm != NULL, return -EINVAL);
 659         *rpcm = NULL;
 660         snd_assert(card != NULL, return -ENXIO);
 661         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 662         if (pcm == NULL)
 663                 return -ENOMEM;
 664         pcm->card = card;
 665         pcm->device = device;
 666         if (id) {
 667                 strlcpy(pcm->id, id, sizeof(pcm->id));
 668         }
 669         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 670                 snd_pcm_free(pcm);
 671                 return err;
 672         }
 673         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 674                 snd_pcm_free(pcm);
 675                 return err;
 676         }
 677         init_MUTEX(&pcm->open_mutex);
 678         init_waitqueue_head(&pcm->open_wait);
 679         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 680                 snd_pcm_free(pcm);
 681                 return err;
 682         }
 683         *rpcm = pcm;
 684         return 0;
 685 }
 686
 687 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
 688 {
 689         snd_pcm_substream_t *substream, *substream_next;
 690 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 691         snd_pcm_oss_setup_t *setup, *setupn;
 692 #endif
 693         substream = pstr->substream;
 694         while (substream) {
 695                 substream_next = substream->next;
 696                 snd_pcm_substream_proc_done(substream);
 697                 kfree(substream);
 698                 substream = substream_next;
 699         }
 700         snd_pcm_stream_proc_done(pstr);
 701 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 702         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 703                 setupn = setup->next;
 704                 kfree(setup->task_name);
 705                 kfree(setup);
 706         }
 707 #endif
 708 }
 709
 710 static int snd_pcm_free(snd_pcm_t *pcm)
 711 {
 712         snd_assert(pcm != NULL, return -ENXIO);
 713         if (pcm->private_free)
 714                 pcm->private_free(pcm);
 715         snd_pcm_lib_preallocate_free_for_all(pcm);
 716         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 717         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 718         kfree(pcm);
 719         return 0;
 720 }
 721
 722 static int snd_pcm_dev_free(snd_device_t *device)
 723 {
 724         snd_pcm_t *pcm = device->device_data;
 725         return snd_pcm_free(pcm);
 726 }
 727
 728 static void snd_pcm_tick_timer_func(unsigned long data)
 729 {
 730         snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
 731         snd_pcm_tick_elapsed(substream);
 732 }
 733
 734 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
 735                            snd_pcm_substream_t **rsubstream)
 736 {
 737         snd_pcm_str_t * pstr;
 738         snd_pcm_substream_t * substream;
 739         snd_pcm_runtime_t * runtime;
 740         snd_ctl_file_t *kctl;
 741         snd_card_t *card;
 742         struct list_head *list;
 743         int prefer_subdevice = -1;
 744         size_t size;
 745
 746         snd_assert(rsubstream != NULL, return -EINVAL);
 747         *rsubstream = NULL;
 748         snd_assert(pcm != NULL, return -ENXIO);
 749         pstr = &pcm->streams[stream];
 750         if (pstr->substream == NULL)
 751                 return -ENODEV;
 752
 753         card = pcm->card;
 754         down_read(&card->controls_rwsem);
 755         list_for_each(list, &card->ctl_files) {
 756                 kctl = snd_ctl_file(list);
 757                 if (kctl->pid == current->pid) {
 758                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 759                         break;
 760                 }
 761         }
 762         up_read(&card->controls_rwsem);
 763
 764         if (pstr->substream_count == 0)
 765                 return -ENODEV;
 766         switch (stream) {
 767         case SNDRV_PCM_STREAM_PLAYBACK:
 768                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 769                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 770                                 if (SUBSTREAM_BUSY(substream))
 771                                         return -EAGAIN;
 772                         }
 773                 }
 774                 break;
 775         case SNDRV_PCM_STREAM_CAPTURE:
 776                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 777                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 778                                 if (SUBSTREAM_BUSY(substream))
 779                                         return -EAGAIN;
 780                         }
 781                 }
 782                 break;
 783         default:
 784                 return -EINVAL;
 785         }
 786
 787         if (prefer_subdevice >= 0) {
 788                 for (substream = pstr->substream; substream; substream = substream->next)
 789                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 790                                 goto __ok;
 791         }
 792         for (substream = pstr->substream; substream; substream = substream->next)
 793                 if (!SUBSTREAM_BUSY(substream))
 794                         break;
 795       __ok:
 796         if (substream == NULL)
 797                 return -EAGAIN;
 798
 799         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 800         if (runtime == NULL)
 801                 return -ENOMEM;
 802
 803         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
 804         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 805         if (runtime->status == NULL) {
 806                 kfree(runtime);
 807                 return -ENOMEM;
 808         }
 809         memset((void*)runtime->status, 0, size);
 810
 811         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
 812         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 813         if (runtime->control == NULL) {
 814                 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
 815                 kfree(runtime);
 816                 return -ENOMEM;
 817         }
 818         memset((void*)runtime->control, 0, size);
 819
 820         init_waitqueue_head(&runtime->sleep);
 821         atomic_set(&runtime->mmap_count, 0);
 822         init_timer(&runtime->tick_timer);
 823         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 824         runtime->tick_timer.data = (unsigned long) substream;
 825
 826         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 827
 828         substream->runtime = runtime;
 829         substream->private_data = pcm->private_data;
 830         pstr->substream_opened++;
 831         *rsubstream = substream;
 832         return 0;
 833 }
 834
 835 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
 836 {
 837         snd_pcm_runtime_t * runtime;
 838         substream->file = NULL;
 839         runtime = substream->runtime;
 840         snd_assert(runtime != NULL, return);
 841         if (runtime->private_free != NULL)
 842                 runtime->private_free(runtime);
 843         snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
 844         snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
 845         kfree(runtime->hw_constraints.rules);
 846         kfree(runtime);
 847         substream->runtime = NULL;
 848         substream->pstr->substream_opened--;
 849 }
 850
 851 static int snd_pcm_dev_register(snd_device_t *device)
 852 {
 853         int idx, cidx, err;
 854         unsigned short minor;
 855         snd_pcm_substream_t *substream;
 856         struct list_head *list;
 857         char str[16];
 858         snd_pcm_t *pcm = device->device_data;
 859
 860         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 861         down(&register_mutex);
 862         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 863         if (snd_pcm_devices[idx]) {
 864                 up(&register_mutex);
 865                 return -EBUSY;
 866         }
 867         snd_pcm_devices[idx] = pcm;
 868         for (cidx = 0; cidx < 2; cidx++) {
 869                 int devtype = -1;
 870                 if (pcm->streams[cidx].substream == NULL)
 871                         continue;
 872                 switch (cidx) {
 873                 case SNDRV_PCM_STREAM_PLAYBACK:
 874                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 875                         minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
 876                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 877                         break;
 878                 case SNDRV_PCM_STREAM_CAPTURE:
 879                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 880                         minor = SNDRV_MINOR_PCM_CAPTURE + idx;
 881                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 882                         break;
 883                 }
 884                 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
 885                         snd_pcm_devices[idx] = NULL;
 886                         up(&register_mutex);
 887                         return err;
 888                 }
 889                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 890                         snd_pcm_timer_init(substream);
 891         }
 892         list_for_each(list, &snd_pcm_notify_list) {
 893                 snd_pcm_notify_t *notify;
 894                 notify = list_entry(list, snd_pcm_notify_t, list);
 895                 notify->n_register(pcm);
 896         }
 897         up(&register_mutex);
 898         return 0;
 899 }
 900
 901 static int snd_pcm_dev_disconnect(snd_device_t *device)
 902 {
 903         snd_pcm_t *pcm = device->device_data;
 904         struct list_head *list;
 905         snd_pcm_substream_t *substream;
 906         int idx, cidx;
 907
 908         down(&register_mutex);
 909         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 910         snd_pcm_devices[idx] = NULL;
 911         for (cidx = 0; cidx < 2; cidx++)
 912                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 913                         if (substream->runtime)
 914                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 915         list_for_each(list, &snd_pcm_notify_list) {
 916                 snd_pcm_notify_t *notify;
 917                 notify = list_entry(list, snd_pcm_notify_t, list);
 918                 notify->n_disconnect(pcm);
 919         }
 920         up(&register_mutex);
 921         return 0;
 922 }
 923
 924 static int snd_pcm_dev_unregister(snd_device_t *device)
 925 {
 926         int idx, cidx, devtype;
 927         snd_pcm_substream_t *substream;
 928         struct list_head *list;
 929         snd_pcm_t *pcm = device->device_data;
 930
 931         snd_assert(pcm != NULL, return -ENXIO);
 932         down(&register_mutex);
 933         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 934         snd_pcm_devices[idx] = NULL;
 935         for (cidx = 0; cidx < 2; cidx++) {
 936                 devtype = -1;
 937                 switch (cidx) {
 938                 case SNDRV_PCM_STREAM_PLAYBACK:
 939                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 940                         break;
 941                 case SNDRV_PCM_STREAM_CAPTURE:
 942                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 943                         break;
 944                 }
 945                 snd_unregister_device(devtype, pcm->card, pcm->device);
 946                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 947                         snd_pcm_timer_done(substream);
 948         }
 949         list_for_each(list, &snd_pcm_notify_list) {
 950                 snd_pcm_notify_t *notify;
 951                 notify = list_entry(list, snd_pcm_notify_t, list);
 952                 notify->n_unregister(pcm);
 953         }
 954         up(&register_mutex);
 955         return snd_pcm_free(pcm);
 956 }
 957
 958 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
 959 {
 960         int idx;
 961
 962         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
 963         down(&register_mutex);
 964         if (nfree) {
 965                 list_del(&notify->list);
 966                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 967                         if (snd_pcm_devices[idx] == NULL)
 968                                 continue;
 969                         notify->n_unregister(snd_pcm_devices[idx]);
 970                 }
 971         } else {
 972                 list_add_tail(&notify->list, &snd_pcm_notify_list);
 973                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 974                         if (snd_pcm_devices[idx] == NULL)
 975                                 continue;
 976                         notify->n_register(snd_pcm_devices[idx]);
 977                 }
 978         }
 979         up(&register_mutex);
 980         return 0;
 981 }
 982
 983 /*
 984  *  Info interface
 985  */
 986
 987 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 988 {
 989         int idx;
 990         snd_pcm_t *pcm;
 991
 992         down(&register_mutex);
 993         for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 994                 pcm = snd_pcm_devices[idx];
 995                 if (pcm == NULL)
 996                         continue;
 997                 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
 998                             idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
 999                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1000                         snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1001                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1002                         snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1003                 snd_iprintf(buffer, "\n");
1004         }
1005         up(&register_mutex);
1006 }
1007
1008 /*
1009  *  ENTRY functions
1010  */
1011
1012 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1013
1014 static int __init alsa_pcm_init(void)
1015 {
1016         snd_info_entry_t *entry;
1017
1018         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1019         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1020         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1021                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1022                 if (snd_info_register(entry) < 0) {
1023                         snd_info_free_entry(entry);
1024                         entry = NULL;
1025                 }
1026         }
1027         snd_pcm_proc_entry = entry;
1028         return 0;
1029 }
1030
1031 static void __exit alsa_pcm_exit(void)
1032 {
1033         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1034         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1035         if (snd_pcm_proc_entry) {
1036                 snd_info_unregister(snd_pcm_proc_entry);
1037                 snd_pcm_proc_entry = NULL;
1038         }
1039 }
1040
1041 module_init(alsa_pcm_init)
1042 module_exit(alsa_pcm_exit)
1043
1044 EXPORT_SYMBOL(snd_pcm_devices);
1045 EXPORT_SYMBOL(snd_pcm_new);
1046 EXPORT_SYMBOL(snd_pcm_new_stream);
1047 EXPORT_SYMBOL(snd_pcm_notify);
1048 EXPORT_SYMBOL(snd_pcm_open_substream);
1049 EXPORT_SYMBOL(snd_pcm_release_substream);
1050 EXPORT_SYMBOL(snd_pcm_format_name);
1051   /* pcm_native.c */
1052 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1053 #ifdef CONFIG_PM
1054 EXPORT_SYMBOL(snd_pcm_suspend);
1055 EXPORT_SYMBOL(snd_pcm_suspend_all);
1056 #endif
1057 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1058 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1059 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1060 EXPORT_SYMBOL(snd_pcm_mmap_data);
1061 #if SNDRV_PCM_INFO_MMAP_IOMEM
1062 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1063 #endif
1064  /* pcm_misc.c */
1065 EXPORT_SYMBOL(snd_pcm_format_signed);
1066 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1067 EXPORT_SYMBOL(snd_pcm_format_linear);
1068 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1069 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1070 EXPORT_SYMBOL(snd_pcm_format_width);
1071 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1072 EXPORT_SYMBOL(snd_pcm_format_size);
1073 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1074 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1075 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1076 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);