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