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 char *snd_pcm_stream_names[] = {
 130         STREAM(PLAYBACK),
 131         STREAM(CAPTURE),
 132 };
 133
 134 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 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 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 char *snd_pcm_subformat_names[] = {
 195         SUBFORMAT(STD),
 196 };
 197
 198 char *snd_pcm_tstamp_mode_names[] = {
 199         TSTAMP(NONE),
 200         TSTAMP(MMAP),
 201 };
 202
 203 const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
 204 {
 205         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return 0);
 206         return snd_pcm_stream_names[stream];
 207 }
 208
 209 const char *snd_pcm_access_name(snd_pcm_access_t access)
 210 {
 211         snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return 0);
 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 0);
 218         return snd_pcm_format_names[format];
 219 }
 220
 221 const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 222 {
 223         snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return 0);
 224         return snd_pcm_subformat_names[subformat];
 225 }
 226
 227 const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
 228 {
 229         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return 0);
 230         return snd_pcm_tstamp_mode_names[mode];
 231 }
 232
 233 const char *snd_pcm_state_name(snd_pcm_state_t state)
 234 {
 235         snd_assert(state <= SNDRV_PCM_STATE_LAST, return 0);
 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 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
 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         snd_runtime_check(substream, return);
 276         err = snd_pcm_info(substream, &info);
 277         if (err < 0) {
 278                 snd_iprintf(buffer, "error %d\n", err);
 279                 return;
 280         }
 281         snd_iprintf(buffer, "card: %d\n", info.card);
 282         snd_iprintf(buffer, "device: %d\n", info.device);
 283         snd_iprintf(buffer, "subdevice: %d\n", info.subdevice);
 284         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info.stream));
 285         snd_iprintf(buffer, "id: %s\n", info.id);
 286         snd_iprintf(buffer, "name: %s\n", info.name);
 287         snd_iprintf(buffer, "subname: %s\n", info.subname);
 288         snd_iprintf(buffer, "class: %d\n", info.dev_class);
 289         snd_iprintf(buffer, "subclass: %d\n", info.dev_subclass);
 290         snd_iprintf(buffer, "subdevices_count: %d\n", info.subdevices_count);
 291         snd_iprintf(buffer, "subdevices_avail: %d\n", info.subdevices_avail);
 292 }
 293
 294 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 295 {
 296         snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
 297 }
 298
 299 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 300 {
 301         snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
 302 }
 303
 304 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 305 {
 306         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 307         snd_pcm_runtime_t *runtime = substream->runtime;
 308         if (!runtime) {
 309                 snd_iprintf(buffer, "closed\n");
 310                 return;
 311         }
 312         snd_pcm_stream_lock_irq(substream);
 313         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 314                 snd_iprintf(buffer, "no setup\n");
 315                 snd_pcm_stream_unlock_irq(substream);
 316                 return;
 317         }
 318         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 319         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 320         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 321         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 322         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 323         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 324         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 325         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 326 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 327         if (substream->oss.oss) {
 328                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 329                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 330                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 331                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 332                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 333                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 334         }
 335 #endif
 336         snd_pcm_stream_unlock_irq(substream);
 337 }
 338
 339 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 340 {
 341         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 342         snd_pcm_runtime_t *runtime = substream->runtime;
 343         if (!runtime) {
 344                 snd_iprintf(buffer, "closed\n");
 345                 return;
 346         }
 347         snd_pcm_stream_lock_irq(substream);
 348         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 349                 snd_iprintf(buffer, "no setup\n");
 350                 snd_pcm_stream_unlock_irq(substream);
 351                 return;
 352         }
 353         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 354         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 355         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 356         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 357         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 358         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 359         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 360         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 361         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 362         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 363         snd_pcm_stream_unlock_irq(substream);
 364 }
 365
 366 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 367 {
 368         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 369         snd_pcm_runtime_t *runtime = substream->runtime;
 370         snd_pcm_status_t status;
 371         int err;
 372         if (!runtime) {
 373                 snd_iprintf(buffer, "closed\n");
 374                 return;
 375         }
 376         memset(&status, 0, sizeof(status));
 377         err = snd_pcm_status(substream, &status);
 378         if (err < 0) {
 379                 snd_iprintf(buffer, "error %d\n", err);
 380                 return;
 381         }
 382         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 383         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 384                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 385         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 386                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 387         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 388         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 389         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 390         snd_iprintf(buffer, "-----\n");
 391         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 392         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 393 }
 394
 395 #ifdef CONFIG_SND_DEBUG
 396 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 397 {
 398         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
 399         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 400 }
 401
 402 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 403 {
 404         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
 405         char line[64];
 406         if (!snd_info_get_line(buffer, line, sizeof(line)))
 407                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 408 }
 409 #endif
 410
 411 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
 412 {
 413         snd_pcm_t *pcm = pstr->pcm;
 414         snd_info_entry_t *entry;
 415         char name[16];
 416
 417         sprintf(name, "pcm%i%c", pcm->device,
 418                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 419         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 420                 return -ENOMEM;
 421         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 422         if (snd_info_register(entry) < 0) {
 423                 snd_info_free_entry(entry);
 424                 return -ENOMEM;
 425         }
 426         pstr->proc_root = entry;
 427
 428         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 429                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
 430                 if (snd_info_register(entry) < 0) {
 431                         snd_info_free_entry(entry);
 432                         entry = NULL;
 433                 }
 434         }
 435         pstr->proc_info_entry = entry;
 436
 437 #ifdef CONFIG_SND_DEBUG
 438         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
 439                 entry->c.text.read_size = 64;
 440                 entry->c.text.read = snd_pcm_xrun_debug_read;
 441                 entry->c.text.write_size = 64;
 442                 entry->c.text.write = snd_pcm_xrun_debug_write;
 443                 entry->private_data = pstr;
 444                 if (snd_info_register(entry) < 0) {
 445                         snd_info_free_entry(entry);
 446                         entry = NULL;
 447                 }
 448         }
 449         pstr->proc_xrun_debug_entry = entry;
 450 #endif
 451         return 0;
 452 }
 453
 454 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
 455 {
 456 #ifdef CONFIG_SND_DEBUG
 457         if (pstr->proc_xrun_debug_entry) {
 458                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 459                 pstr->proc_xrun_debug_entry = NULL;
 460         }
 461 #endif
 462         if (pstr->proc_info_entry) {
 463                 snd_info_unregister(pstr->proc_info_entry);
 464                 pstr->proc_info_entry = NULL;
 465         }
 466         if (pstr->proc_root) {
 467                 snd_info_unregister(pstr->proc_root);
 468                 pstr->proc_root = NULL;
 469         }
 470         return 0;
 471 }
 472
 473 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
 474 {
 475         snd_info_entry_t *entry;
 476         snd_card_t *card;
 477         char name[16];
 478
 479         card = substream->pcm->card;
 480
 481         sprintf(name, "sub%i", substream->number);
 482         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 483                 return -ENOMEM;
 484         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 485         if (snd_info_register(entry) < 0) {
 486                 snd_info_free_entry(entry);
 487                 return -ENOMEM;
 488         }
 489         substream->proc_root = entry;
 490
 491         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 492                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
 493                 if (snd_info_register(entry) < 0) {
 494                         snd_info_free_entry(entry);
 495                         entry = NULL;
 496                 }
 497         }
 498         substream->proc_info_entry = entry;
 499
 500         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 501                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
 502                 if (snd_info_register(entry) < 0) {
 503                         snd_info_free_entry(entry);
 504                         entry = NULL;
 505                 }
 506         }
 507         substream->proc_hw_params_entry = entry;
 508
 509         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 510                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
 511                 if (snd_info_register(entry) < 0) {
 512                         snd_info_free_entry(entry);
 513                         entry = NULL;
 514                 }
 515         }
 516         substream->proc_sw_params_entry = entry;
 517
 518         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 519                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
 520                 if (snd_info_register(entry) < 0) {
 521                         snd_info_free_entry(entry);
 522                         entry = NULL;
 523                 }
 524         }
 525         substream->proc_status_entry = entry;
 526
 527         return 0;
 528 }
 529
 530 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
 531 {
 532         if (substream->proc_info_entry) {
 533                 snd_info_unregister(substream->proc_info_entry);
 534                 substream->proc_info_entry = NULL;
 535         }
 536         if (substream->proc_hw_params_entry) {
 537                 snd_info_unregister(substream->proc_hw_params_entry);
 538                 substream->proc_hw_params_entry = NULL;
 539         }
 540         if (substream->proc_sw_params_entry) {
 541                 snd_info_unregister(substream->proc_sw_params_entry);
 542                 substream->proc_sw_params_entry = NULL;
 543         }
 544         if (substream->proc_status_entry) {
 545                 snd_info_unregister(substream->proc_status_entry);
 546                 substream->proc_status_entry = NULL;
 547         }
 548         if (substream->proc_root) {
 549                 snd_info_unregister(substream->proc_root);
 550                 substream->proc_root = NULL;
 551         }
 552         return 0;
 553 }
 554
 555 /**
 556  * snd_pcm_new_stream - create a new PCM stream
 557  * @pcm: the pcm instance
 558  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 559  * @substream_count: the number of substreams
 560  *
 561  * Creates a new stream for the pcm.
 562  * The corresponding stream on the pcm must have been empty before
 563  * calling this, i.e. zero must be given to the argument of
 564  * snd_pcm_new().
 565  *
 566  * Returns zero if successful, or a negative error code on failure.
 567  */
 568 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
 569 {
 570         int idx, err;
 571         snd_pcm_str_t *pstr = &pcm->streams[stream];
 572         snd_pcm_substream_t *substream, *prev;
 573
 574 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 575         init_MUTEX(&pstr->oss.setup_mutex);
 576 #endif
 577         pstr->stream = stream;
 578         pstr->pcm = pcm;
 579         pstr->substream_count = substream_count;
 580         pstr->reg = &snd_pcm_reg[stream];
 581         if (substream_count > 0) {
 582                 err = snd_pcm_stream_proc_init(pstr);
 583                 if (err < 0)
 584                         return err;
 585         }
 586         prev = NULL;
 587         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 588                 substream = snd_magic_kcalloc(snd_pcm_substream_t, 0, GFP_KERNEL);
 589                 if (substream == NULL)
 590                         return -ENOMEM;
 591                 substream->pcm = pcm;
 592                 substream->pstr = pstr;
 593                 substream->number = idx;
 594                 substream->stream = stream;
 595                 sprintf(substream->name, "subdevice #%i", idx);
 596                 substream->buffer_bytes_max = UINT_MAX;
 597                 if (prev == NULL)
 598                         pstr->substream = substream;
 599                 else
 600                         prev->next = substream;
 601                 err = snd_pcm_substream_proc_init(substream);
 602                 if (err < 0) {
 603                         snd_magic_kfree(substream);
 604                         return err;
 605                 }
 606                 substream->group = &substream->self_group;
 607                 spin_lock_init(&substream->self_group.lock);
 608                 INIT_LIST_HEAD(&substream->self_group.substreams);
 609                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 610                 spin_lock_init(&substream->timer_lock);
 611                 prev = substream;
 612         }
 613         return 0;
 614 }
 615
 616 /**
 617  * snd_pcm_new - create a new PCM instance
 618  * @card: the card instance
 619  * @id: the id string
 620  * @device: the device index (zero based)
 621  * @playback_count: the number of substreams for playback
 622  * @capture_count: the number of substreams for capture
 623  * @rpcm: the pointer to store the new pcm instance
 624  *
 625  * Creates a new PCM instance.
 626  *
 627  * The pcm operators have to be set afterwards to the new instance
 628  * via snd_pcm_set_ops().
 629  *
 630  * Returns zero if successful, or a negative error code on failure.
 631  */
 632 int snd_pcm_new(snd_card_t * card, char *id, int device,
 633                 int playback_count, int capture_count,
 634                 snd_pcm_t ** rpcm)
 635 {
 636         snd_pcm_t *pcm;
 637         int err;
 638         static snd_device_ops_t ops = {
 639                 .dev_free = snd_pcm_dev_free,
 640                 .dev_register = snd_pcm_dev_register,
 641                 .dev_disconnect = snd_pcm_dev_disconnect,
 642                 .dev_unregister = snd_pcm_dev_unregister
 643         };
 644
 645         snd_assert(rpcm != NULL, return -EINVAL);
 646         *rpcm = NULL;
 647         snd_assert(card != NULL, return -ENXIO);
 648         pcm = snd_magic_kcalloc(snd_pcm_t, 0, GFP_KERNEL);
 649         if (pcm == NULL)
 650                 return -ENOMEM;
 651         pcm->card = card;
 652         pcm->device = device;
 653         if (id) {
 654                 strlcpy(pcm->id, id, sizeof(pcm->id));
 655         }
 656         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 657                 snd_pcm_free(pcm);
 658                 return err;
 659         }
 660         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 661                 snd_pcm_free(pcm);
 662                 return err;
 663         }
 664         init_MUTEX(&pcm->open_mutex);
 665         init_waitqueue_head(&pcm->open_wait);
 666         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 667                 snd_pcm_free(pcm);
 668                 return err;
 669         }
 670         *rpcm = pcm;
 671         return 0;
 672 }
 673
 674 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
 675 {
 676         snd_pcm_substream_t *substream, *substream_next;
 677 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 678         snd_pcm_oss_setup_t *setup, *setupn;
 679 #endif
 680         substream = pstr->substream;
 681         while (substream) {
 682                 substream_next = substream->next;
 683                 snd_pcm_substream_proc_done(substream);
 684                 snd_magic_kfree(substream);
 685                 substream = substream_next;
 686         }
 687         snd_pcm_stream_proc_done(pstr);
 688 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 689         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 690                 setupn = setup->next;
 691                 kfree(setup->task_name);
 692                 kfree(setup);
 693         }
 694 #endif
 695 }
 696
 697 static int snd_pcm_free(snd_pcm_t *pcm)
 698 {
 699         snd_assert(pcm != NULL, return -ENXIO);
 700         if (pcm->private_free)
 701                 pcm->private_free(pcm);
 702         snd_pcm_lib_preallocate_free_for_all(pcm);
 703         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 704         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 705         snd_magic_kfree(pcm);
 706         return 0;
 707 }
 708
 709 static int snd_pcm_dev_free(snd_device_t *device)
 710 {
 711         snd_pcm_t *pcm = snd_magic_cast(snd_pcm_t, device->device_data, return -ENXIO);
 712         return snd_pcm_free(pcm);
 713 }
 714
 715 static void snd_pcm_tick_timer_func(unsigned long data)
 716 {
 717         snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
 718         snd_pcm_tick_elapsed(substream);
 719 }
 720
 721 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
 722                            snd_pcm_substream_t **rsubstream)
 723 {
 724         snd_pcm_str_t * pstr;
 725         snd_pcm_substream_t * substream;
 726         snd_pcm_runtime_t * runtime;
 727         snd_ctl_file_t *kctl;
 728         snd_card_t *card;
 729         struct list_head *list;
 730         int prefer_subdevice = -1;
 731         size_t size;
 732
 733         snd_assert(rsubstream != NULL, return -EINVAL);
 734         *rsubstream = NULL;
 735         snd_assert(pcm != NULL, return -ENXIO);
 736         pstr = &pcm->streams[stream];
 737         if (pstr->substream == NULL)
 738                 return -ENODEV;
 739
 740         card = pcm->card;
 741         down_read(&card->controls_rwsem);
 742         list_for_each(list, &card->ctl_files) {
 743                 kctl = snd_ctl_file(list);
 744                 if (kctl->pid == current->pid) {
 745                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 746                         break;
 747                 }
 748         }
 749         up_read(&card->controls_rwsem);
 750
 751         if (pstr->substream_count == 0)
 752                 return -ENODEV;
 753         switch (stream) {
 754         case SNDRV_PCM_STREAM_PLAYBACK:
 755                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 756                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 757                                 if (SUBSTREAM_BUSY(substream))
 758                                         return -EAGAIN;
 759                         }
 760                 }
 761                 break;
 762         case SNDRV_PCM_STREAM_CAPTURE:
 763                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 764                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 765                                 if (SUBSTREAM_BUSY(substream))
 766                                         return -EAGAIN;
 767                         }
 768                 }
 769                 break;
 770         default:
 771                 return -EINVAL;
 772         }
 773
 774         if (prefer_subdevice >= 0) {
 775                 for (substream = pstr->substream; substream; substream = substream->next)
 776                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 777                                 goto __ok;
 778         }
 779         for (substream = pstr->substream; substream; substream = substream->next)
 780                 if (!SUBSTREAM_BUSY(substream))
 781                         break;
 782       __ok:
 783         if (substream == NULL)
 784                 return -EAGAIN;
 785
 786         runtime = snd_kcalloc(sizeof(snd_pcm_runtime_t), GFP_KERNEL);
 787         if (runtime == NULL)
 788                 return -ENOMEM;
 789
 790         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
 791         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 792         if (runtime->status == NULL) {
 793                 kfree(runtime);
 794                 return -ENOMEM;
 795         }
 796         memset((void*)runtime->status, 0, size);
 797
 798         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
 799         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 800         if (runtime->control == NULL) {
 801                 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
 802                 kfree(runtime);
 803                 return -ENOMEM;
 804         }
 805         memset((void*)runtime->control, 0, size);
 806
 807         init_waitqueue_head(&runtime->sleep);
 808         atomic_set(&runtime->mmap_count, 0);
 809         init_timer(&runtime->tick_timer);
 810         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 811         runtime->tick_timer.data = (unsigned long) substream;
 812
 813         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 814
 815         substream->runtime = runtime;
 816         substream->private_data = pcm->private_data;
 817         pstr->substream_opened++;
 818         *rsubstream = substream;
 819         return 0;
 820 }
 821
 822 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
 823 {
 824         snd_pcm_runtime_t * runtime;
 825         substream->file = NULL;
 826         runtime = substream->runtime;
 827         snd_assert(runtime != NULL, return);
 828         if (runtime->private_free != NULL)
 829                 runtime->private_free(runtime);
 830         snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
 831         snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
 832         if (runtime->hw_constraints.rules)
 833                 kfree(runtime->hw_constraints.rules);
 834         kfree(runtime);
 835         substream->runtime = NULL;
 836         substream->pstr->substream_opened--;
 837 }
 838
 839 static int snd_pcm_dev_register(snd_device_t *device)
 840 {
 841         int idx, cidx, err;
 842         unsigned short minor;
 843         snd_pcm_substream_t *substream;
 844         struct list_head *list;
 845         char str[16];
 846         snd_pcm_t *pcm = snd_magic_cast(snd_pcm_t, device->device_data, return -ENXIO);
 847
 848         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 849         down(&register_mutex);
 850         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 851         if (snd_pcm_devices[idx]) {
 852                 up(&register_mutex);
 853                 return -EBUSY;
 854         }
 855         snd_pcm_devices[idx] = pcm;
 856         for (cidx = 0; cidx < 2; cidx++) {
 857                 int devtype = -1;
 858                 if (pcm->streams[cidx].substream == NULL)
 859                         continue;
 860                 switch (cidx) {
 861                 case SNDRV_PCM_STREAM_PLAYBACK:
 862                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 863                         minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
 864                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 865                         break;
 866                 case SNDRV_PCM_STREAM_CAPTURE:
 867                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 868                         minor = SNDRV_MINOR_PCM_CAPTURE + idx;
 869                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 870                         break;
 871                 }
 872                 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
 873                         snd_pcm_devices[idx] = NULL;
 874                         up(&register_mutex);
 875                         return err;
 876                 }
 877                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 878                         snd_pcm_timer_init(substream);
 879         }
 880         list_for_each(list, &snd_pcm_notify_list) {
 881                 snd_pcm_notify_t *notify;
 882                 notify = list_entry(list, snd_pcm_notify_t, list);
 883                 notify->n_register(pcm);
 884         }
 885         up(&register_mutex);
 886         return 0;
 887 }
 888
 889 static int snd_pcm_dev_disconnect(snd_device_t *device)
 890 {
 891         snd_pcm_t *pcm = snd_magic_cast(snd_pcm_t, device->device_data, return -ENXIO);
 892         struct list_head *list;
 893         snd_pcm_substream_t *substream;
 894         int idx, cidx;
 895
 896         down(&register_mutex);
 897         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 898         snd_pcm_devices[idx] = NULL;
 899         for (cidx = 0; cidx < 2; cidx++)
 900                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 901                         if (substream->runtime)
 902                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 903         list_for_each(list, &snd_pcm_notify_list) {
 904                 snd_pcm_notify_t *notify;
 905                 notify = list_entry(list, snd_pcm_notify_t, list);
 906                 notify->n_disconnect(pcm);
 907         }
 908         up(&register_mutex);
 909         return 0;
 910 }
 911
 912 static int snd_pcm_dev_unregister(snd_device_t *device)
 913 {
 914         int idx, cidx, devtype;
 915         snd_pcm_substream_t *substream;
 916         struct list_head *list;
 917         snd_pcm_t *pcm = snd_magic_cast(snd_pcm_t, device->device_data, return -ENXIO);
 918
 919         snd_assert(pcm != NULL, return -ENXIO);
 920         down(&register_mutex);
 921         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 922         snd_pcm_devices[idx] = NULL;
 923         for (cidx = 0; cidx < 2; cidx++) {
 924                 devtype = -1;
 925                 switch (cidx) {
 926                 case SNDRV_PCM_STREAM_PLAYBACK:
 927                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 928                         break;
 929                 case SNDRV_PCM_STREAM_CAPTURE:
 930                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 931                         break;
 932                 }
 933                 snd_unregister_device(devtype, pcm->card, pcm->device);
 934                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 935                         snd_pcm_timer_done(substream);
 936         }
 937         list_for_each(list, &snd_pcm_notify_list) {
 938                 snd_pcm_notify_t *notify;
 939                 notify = list_entry(list, snd_pcm_notify_t, list);
 940                 notify->n_unregister(pcm);
 941         }
 942         up(&register_mutex);
 943         return snd_pcm_free(pcm);
 944 }
 945
 946 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
 947 {
 948         int idx;
 949
 950         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
 951         down(&register_mutex);
 952         if (nfree) {
 953                 list_del(&notify->list);
 954                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 955                         if (snd_pcm_devices[idx] == NULL)
 956                                 continue;
 957                         notify->n_unregister(snd_pcm_devices[idx]);
 958                 }
 959         } else {
 960                 list_add_tail(&notify->list, &snd_pcm_notify_list);
 961                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 962                         if (snd_pcm_devices[idx] == NULL)
 963                                 continue;
 964                         notify->n_register(snd_pcm_devices[idx]);
 965                 }
 966         }
 967         up(&register_mutex);
 968         return 0;
 969 }
 970
 971 /*
 972  *  Info interface
 973  */
 974
 975 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 976 {
 977         int idx;
 978         snd_pcm_t *pcm;
 979
 980         down(&register_mutex);
 981         for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 982                 pcm = snd_pcm_devices[idx];
 983                 if (pcm == NULL)
 984                         continue;
 985                 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
 986                             idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
 987                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
 988                         snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
 989                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
 990                         snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
 991                 snd_iprintf(buffer, "\n");
 992         }
 993         up(&register_mutex);
 994 }
 995
 996 /*
 997  *  ENTRY functions
 998  */
 999
1000 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1001
1002 static int __init alsa_pcm_init(void)
1003 {
1004         snd_info_entry_t *entry;
1005
1006         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1007         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1008                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1009                 if (snd_info_register(entry) < 0) {
1010                         snd_info_free_entry(entry);
1011                         entry = NULL;
1012                 }
1013         }
1014         snd_pcm_proc_entry = entry;
1015         return 0;
1016 }
1017
1018 static void __exit alsa_pcm_exit(void)
1019 {
1020         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1021         if (snd_pcm_proc_entry) {
1022                 snd_info_unregister(snd_pcm_proc_entry);
1023                 snd_pcm_proc_entry = NULL;
1024         }
1025 }
1026
1027 module_init(alsa_pcm_init)
1028 module_exit(alsa_pcm_exit)
1029
1030 EXPORT_SYMBOL(snd_pcm_devices);
1031 EXPORT_SYMBOL(snd_pcm_new);
1032 EXPORT_SYMBOL(snd_pcm_new_stream);
1033 EXPORT_SYMBOL(snd_pcm_notify);
1034 EXPORT_SYMBOL(snd_pcm_open_substream);
1035 EXPORT_SYMBOL(snd_pcm_release_substream);
1036 EXPORT_SYMBOL(snd_pcm_format_name);
1037 EXPORT_SYMBOL(snd_pcm_subformat_name);
1038   /* pcm_native.c */
1039 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1040 EXPORT_SYMBOL(snd_pcm_start);
1041 #ifdef CONFIG_PM
1042 EXPORT_SYMBOL(snd_pcm_suspend);
1043 EXPORT_SYMBOL(snd_pcm_suspend_all);
1044 #endif
1045 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1046 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1047 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1048 EXPORT_SYMBOL(snd_pcm_open);
1049 EXPORT_SYMBOL(snd_pcm_release);
1050 EXPORT_SYMBOL(snd_pcm_playback_poll);
1051 EXPORT_SYMBOL(snd_pcm_capture_poll);
1052 EXPORT_SYMBOL(snd_pcm_mmap_data);
1053  /* pcm_misc.c */
1054 EXPORT_SYMBOL(snd_pcm_format_signed);
1055 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1056 EXPORT_SYMBOL(snd_pcm_format_linear);
1057 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1058 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1059 EXPORT_SYMBOL(snd_pcm_format_width);
1060 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1061 EXPORT_SYMBOL(snd_pcm_format_size);
1062 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1063 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1064 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1065 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);