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 struct snd_pcm *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(struct snd_pcm *pcm);
  41 static int snd_pcm_dev_free(struct snd_device *device);
  42 static int snd_pcm_dev_register(struct snd_device *device);
  43 static int snd_pcm_dev_disconnect(struct snd_device *device);
  44 static int snd_pcm_dev_unregister(struct snd_device *device);
  45
  46 static int snd_pcm_control_ioctl(struct snd_card *card,
  47                                  struct snd_ctl_file *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                         struct snd_pcm_info __user *info;
  75                         unsigned int device, subdevice;
  76                         int stream;
  77                         struct snd_pcm *pcm;
  78                         struct snd_pcm_str *pstr;
  79                         struct snd_pcm_substream *substream;
  80                         info = (struct snd_pcm_info __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(int 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         return snd_pcm_access_names[access];
 212 }
 213
 214 const char *snd_pcm_format_name(snd_pcm_format_t format)
 215 {
 216         return snd_pcm_format_names[format];
 217 }
 218
 219 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 220 {
 221         return snd_pcm_subformat_names[subformat];
 222 }
 223
 224 static const char *snd_pcm_tstamp_mode_name(int mode)
 225 {
 226         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 227         return snd_pcm_tstamp_mode_names[mode];
 228 }
 229
 230 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 231 {
 232         return snd_pcm_state_names[state];
 233 }
 234
 235 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 236 #include <linux/soundcard.h>
 237 static const char *snd_pcm_oss_format_name(int format)
 238 {
 239         switch (format) {
 240         case AFMT_MU_LAW:
 241                 return "MU_LAW";
 242         case AFMT_A_LAW:
 243                 return "A_LAW";
 244         case AFMT_IMA_ADPCM:
 245                 return "IMA_ADPCM";
 246         case AFMT_U8:
 247                 return "U8";
 248         case AFMT_S16_LE:
 249                 return "S16_LE";
 250         case AFMT_S16_BE:
 251                 return "S16_BE";
 252         case AFMT_S8:
 253                 return "S8";
 254         case AFMT_U16_LE:
 255                 return "U16_LE";
 256         case AFMT_U16_BE:
 257                 return "U16_BE";
 258         case AFMT_MPEG:
 259                 return "MPEG";
 260         default:
 261                 return "unknown";
 262         }
 263 }
 264 #endif
 265
 266 #ifdef CONFIG_PROC_FS
 267 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 268                                    struct snd_info_buffer *buffer)
 269 {
 270         struct snd_pcm_info *info;
 271         int err;
 272
 273         if (! substream)
 274                 return;
 275
 276         info = kmalloc(sizeof(*info), GFP_KERNEL);
 277         if (! info) {
 278                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 279                 return;
 280         }
 281
 282         err = snd_pcm_info(substream, info);
 283         if (err < 0) {
 284                 snd_iprintf(buffer, "error %d\n", err);
 285                 kfree(info);
 286                 return;
 287         }
 288         snd_iprintf(buffer, "card: %d\n", info->card);
 289         snd_iprintf(buffer, "device: %d\n", info->device);
 290         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 291         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 292         snd_iprintf(buffer, "id: %s\n", info->id);
 293         snd_iprintf(buffer, "name: %s\n", info->name);
 294         snd_iprintf(buffer, "subname: %s\n", info->subname);
 295         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 296         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 297         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 298         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 299         kfree(info);
 300 }
 301
 302 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 303                                           struct snd_info_buffer *buffer)
 304 {
 305         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 306                                buffer);
 307 }
 308
 309 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 310                                              struct snd_info_buffer *buffer)
 311 {
 312         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 313                                buffer);
 314 }
 315
 316 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 317                                                   struct snd_info_buffer *buffer)
 318 {
 319         struct snd_pcm_substream *substream = entry->private_data;
 320         struct snd_pcm_runtime *runtime = substream->runtime;
 321         if (!runtime) {
 322                 snd_iprintf(buffer, "closed\n");
 323                 return;
 324         }
 325         snd_pcm_stream_lock_irq(substream);
 326         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 327                 snd_iprintf(buffer, "no setup\n");
 328                 snd_pcm_stream_unlock_irq(substream);
 329                 return;
 330         }
 331         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 332         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 333         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 334         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 335         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 336         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 337         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 338         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 339 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 340         if (substream->oss.oss) {
 341                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 342                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 343                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 344                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 345                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 346                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 347         }
 348 #endif
 349         snd_pcm_stream_unlock_irq(substream);
 350 }
 351
 352 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 353                                                   struct snd_info_buffer *buffer)
 354 {
 355         struct snd_pcm_substream *substream = entry->private_data;
 356         struct snd_pcm_runtime *runtime = substream->runtime;
 357         if (!runtime) {
 358                 snd_iprintf(buffer, "closed\n");
 359                 return;
 360         }
 361         snd_pcm_stream_lock_irq(substream);
 362         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 363                 snd_iprintf(buffer, "no setup\n");
 364                 snd_pcm_stream_unlock_irq(substream);
 365                 return;
 366         }
 367         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 368         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 369         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 370         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 371         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 372         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 373         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 374         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 375         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 376         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 377         snd_pcm_stream_unlock_irq(substream);
 378 }
 379
 380 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 381                                                struct snd_info_buffer *buffer)
 382 {
 383         struct snd_pcm_substream *substream = entry->private_data;
 384         struct snd_pcm_runtime *runtime = substream->runtime;
 385         struct snd_pcm_status status;
 386         int err;
 387         if (!runtime) {
 388                 snd_iprintf(buffer, "closed\n");
 389                 return;
 390         }
 391         memset(&status, 0, sizeof(status));
 392         err = snd_pcm_status(substream, &status);
 393         if (err < 0) {
 394                 snd_iprintf(buffer, "error %d\n", err);
 395                 return;
 396         }
 397         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 398         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 399                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 400         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 401                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 402         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 403         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 404         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 405         snd_iprintf(buffer, "-----\n");
 406         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 407         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 408 }
 409 #endif
 410
 411 #ifdef CONFIG_SND_DEBUG
 412 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 413                                     struct snd_info_buffer *buffer)
 414 {
 415         struct snd_pcm_str *pstr = entry->private_data;
 416         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 417 }
 418
 419 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 420                                      struct snd_info_buffer *buffer)
 421 {
 422         struct snd_pcm_str *pstr = entry->private_data;
 423         char line[64];
 424         if (!snd_info_get_line(buffer, line, sizeof(line)))
 425                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 426 }
 427 #endif
 428
 429 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 430 {
 431         struct snd_pcm *pcm = pstr->pcm;
 432         struct snd_info_entry *entry;
 433         char name[16];
 434
 435         sprintf(name, "pcm%i%c", pcm->device,
 436                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 437         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 438                 return -ENOMEM;
 439         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 440         if (snd_info_register(entry) < 0) {
 441                 snd_info_free_entry(entry);
 442                 return -ENOMEM;
 443         }
 444         pstr->proc_root = entry;
 445
 446         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 447                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
 448                 if (snd_info_register(entry) < 0) {
 449                         snd_info_free_entry(entry);
 450                         entry = NULL;
 451                 }
 452         }
 453         pstr->proc_info_entry = entry;
 454
 455 #ifdef CONFIG_SND_DEBUG
 456         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 457                                                 pstr->proc_root)) != NULL) {
 458                 entry->c.text.read_size = 64;
 459                 entry->c.text.read = snd_pcm_xrun_debug_read;
 460                 entry->c.text.write_size = 64;
 461                 entry->c.text.write = snd_pcm_xrun_debug_write;
 462                 entry->mode |= S_IWUSR;
 463                 entry->private_data = pstr;
 464                 if (snd_info_register(entry) < 0) {
 465                         snd_info_free_entry(entry);
 466                         entry = NULL;
 467                 }
 468         }
 469         pstr->proc_xrun_debug_entry = entry;
 470 #endif
 471         return 0;
 472 }
 473
 474 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 475 {
 476 #ifdef CONFIG_SND_DEBUG
 477         if (pstr->proc_xrun_debug_entry) {
 478                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 479                 pstr->proc_xrun_debug_entry = NULL;
 480         }
 481 #endif
 482         if (pstr->proc_info_entry) {
 483                 snd_info_unregister(pstr->proc_info_entry);
 484                 pstr->proc_info_entry = NULL;
 485         }
 486         if (pstr->proc_root) {
 487                 snd_info_unregister(pstr->proc_root);
 488                 pstr->proc_root = NULL;
 489         }
 490         return 0;
 491 }
 492
 493 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 494 {
 495         struct snd_info_entry *entry;
 496         struct snd_card *card;
 497         char name[16];
 498
 499         card = substream->pcm->card;
 500
 501         sprintf(name, "sub%i", substream->number);
 502         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 503                 return -ENOMEM;
 504         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 505         if (snd_info_register(entry) < 0) {
 506                 snd_info_free_entry(entry);
 507                 return -ENOMEM;
 508         }
 509         substream->proc_root = entry;
 510
 511         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 512                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
 513                 if (snd_info_register(entry) < 0) {
 514                         snd_info_free_entry(entry);
 515                         entry = NULL;
 516                 }
 517         }
 518         substream->proc_info_entry = entry;
 519
 520         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 521                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
 522                 if (snd_info_register(entry) < 0) {
 523                         snd_info_free_entry(entry);
 524                         entry = NULL;
 525                 }
 526         }
 527         substream->proc_hw_params_entry = entry;
 528
 529         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 530                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
 531                 if (snd_info_register(entry) < 0) {
 532                         snd_info_free_entry(entry);
 533                         entry = NULL;
 534                 }
 535         }
 536         substream->proc_sw_params_entry = entry;
 537
 538         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 539                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
 540                 if (snd_info_register(entry) < 0) {
 541                         snd_info_free_entry(entry);
 542                         entry = NULL;
 543                 }
 544         }
 545         substream->proc_status_entry = entry;
 546
 547         return 0;
 548 }
 549
 550 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 551 {
 552         if (substream->proc_info_entry) {
 553                 snd_info_unregister(substream->proc_info_entry);
 554                 substream->proc_info_entry = NULL;
 555         }
 556         if (substream->proc_hw_params_entry) {
 557                 snd_info_unregister(substream->proc_hw_params_entry);
 558                 substream->proc_hw_params_entry = NULL;
 559         }
 560         if (substream->proc_sw_params_entry) {
 561                 snd_info_unregister(substream->proc_sw_params_entry);
 562                 substream->proc_sw_params_entry = NULL;
 563         }
 564         if (substream->proc_status_entry) {
 565                 snd_info_unregister(substream->proc_status_entry);
 566                 substream->proc_status_entry = NULL;
 567         }
 568         if (substream->proc_root) {
 569                 snd_info_unregister(substream->proc_root);
 570                 substream->proc_root = NULL;
 571         }
 572         return 0;
 573 }
 574
 575 /**
 576  * snd_pcm_new_stream - create a new PCM stream
 577  * @pcm: the pcm instance
 578  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 579  * @substream_count: the number of substreams
 580  *
 581  * Creates a new stream for the pcm.
 582  * The corresponding stream on the pcm must have been empty before
 583  * calling this, i.e. zero must be given to the argument of
 584  * snd_pcm_new().
 585  *
 586  * Returns zero if successful, or a negative error code on failure.
 587  */
 588 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 589 {
 590         int idx, err;
 591         struct snd_pcm_str *pstr = &pcm->streams[stream];
 592         struct snd_pcm_substream *substream, *prev;
 593
 594 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 595         init_MUTEX(&pstr->oss.setup_mutex);
 596 #endif
 597         pstr->stream = stream;
 598         pstr->pcm = pcm;
 599         pstr->substream_count = substream_count;
 600         pstr->reg = &snd_pcm_reg[stream];
 601         if (substream_count > 0) {
 602                 err = snd_pcm_stream_proc_init(pstr);
 603                 if (err < 0) {
 604                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 605                         return err;
 606                 }
 607         }
 608         prev = NULL;
 609         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 610                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 611                 if (substream == NULL) {
 612                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 613                         return -ENOMEM;
 614                 }
 615                 substream->pcm = pcm;
 616                 substream->pstr = pstr;
 617                 substream->number = idx;
 618                 substream->stream = stream;
 619                 sprintf(substream->name, "subdevice #%i", idx);
 620                 substream->buffer_bytes_max = UINT_MAX;
 621                 if (prev == NULL)
 622                         pstr->substream = substream;
 623                 else
 624                         prev->next = substream;
 625                 err = snd_pcm_substream_proc_init(substream);
 626                 if (err < 0) {
 627                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 628                         kfree(substream);
 629                         return err;
 630                 }
 631                 substream->group = &substream->self_group;
 632                 spin_lock_init(&substream->self_group.lock);
 633                 INIT_LIST_HEAD(&substream->self_group.substreams);
 634                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 635                 spin_lock_init(&substream->timer_lock);
 636                 prev = substream;
 637         }
 638         return 0;
 639 }
 640
 641 /**
 642  * snd_pcm_new - create a new PCM instance
 643  * @card: the card instance
 644  * @id: the id string
 645  * @device: the device index (zero based)
 646  * @playback_count: the number of substreams for playback
 647  * @capture_count: the number of substreams for capture
 648  * @rpcm: the pointer to store the new pcm instance
 649  *
 650  * Creates a new PCM instance.
 651  *
 652  * The pcm operators have to be set afterwards to the new instance
 653  * via snd_pcm_set_ops().
 654  *
 655  * Returns zero if successful, or a negative error code on failure.
 656  */
 657 int snd_pcm_new(struct snd_card *card, char *id, int device,
 658                 int playback_count, int capture_count,
 659                 struct snd_pcm ** rpcm)
 660 {
 661         struct snd_pcm *pcm;
 662         int err;
 663         static struct snd_device_ops ops = {
 664                 .dev_free = snd_pcm_dev_free,
 665                 .dev_register = snd_pcm_dev_register,
 666                 .dev_disconnect = snd_pcm_dev_disconnect,
 667                 .dev_unregister = snd_pcm_dev_unregister
 668         };
 669
 670         snd_assert(rpcm != NULL, return -EINVAL);
 671         *rpcm = NULL;
 672         snd_assert(card != NULL, return -ENXIO);
 673         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 674         if (pcm == NULL) {
 675                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 676                 return -ENOMEM;
 677         }
 678         pcm->card = card;
 679         pcm->device = device;
 680         if (id)
 681                 strlcpy(pcm->id, id, sizeof(pcm->id));
 682         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 683                 snd_pcm_free(pcm);
 684                 return err;
 685         }
 686         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 687                 snd_pcm_free(pcm);
 688                 return err;
 689         }
 690         init_MUTEX(&pcm->open_mutex);
 691         init_waitqueue_head(&pcm->open_wait);
 692         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 693                 snd_pcm_free(pcm);
 694                 return err;
 695         }
 696         *rpcm = pcm;
 697         return 0;
 698 }
 699
 700 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 701 {
 702         struct snd_pcm_substream *substream, *substream_next;
 703 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 704         struct snd_pcm_oss_setup *setup, *setupn;
 705 #endif
 706         substream = pstr->substream;
 707         while (substream) {
 708                 substream_next = substream->next;
 709                 snd_pcm_substream_proc_done(substream);
 710                 kfree(substream);
 711                 substream = substream_next;
 712         }
 713         snd_pcm_stream_proc_done(pstr);
 714 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 715         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 716                 setupn = setup->next;
 717                 kfree(setup->task_name);
 718                 kfree(setup);
 719         }
 720 #endif
 721 }
 722
 723 static int snd_pcm_free(struct snd_pcm *pcm)
 724 {
 725         snd_assert(pcm != NULL, return -ENXIO);
 726         if (pcm->private_free)
 727                 pcm->private_free(pcm);
 728         snd_pcm_lib_preallocate_free_for_all(pcm);
 729         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 730         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 731         kfree(pcm);
 732         return 0;
 733 }
 734
 735 static int snd_pcm_dev_free(struct snd_device *device)
 736 {
 737         struct snd_pcm *pcm = device->device_data;
 738         return snd_pcm_free(pcm);
 739 }
 740
 741 static void snd_pcm_tick_timer_func(unsigned long data)
 742 {
 743         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
 744         snd_pcm_tick_elapsed(substream);
 745 }
 746
 747 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
 748                            struct snd_pcm_substream **rsubstream)
 749 {
 750         struct snd_pcm_str * pstr;
 751         struct snd_pcm_substream *substream;
 752         struct snd_pcm_runtime *runtime;
 753         struct snd_ctl_file *kctl;
 754         struct snd_card *card;
 755         struct list_head *list;
 756         int prefer_subdevice = -1;
 757         size_t size;
 758
 759         snd_assert(rsubstream != NULL, return -EINVAL);
 760         *rsubstream = NULL;
 761         snd_assert(pcm != NULL, return -ENXIO);
 762         pstr = &pcm->streams[stream];
 763         if (pstr->substream == NULL)
 764                 return -ENODEV;
 765
 766         card = pcm->card;
 767         down_read(&card->controls_rwsem);
 768         list_for_each(list, &card->ctl_files) {
 769                 kctl = snd_ctl_file(list);
 770                 if (kctl->pid == current->pid) {
 771                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 772                         break;
 773                 }
 774         }
 775         up_read(&card->controls_rwsem);
 776
 777         if (pstr->substream_count == 0)
 778                 return -ENODEV;
 779         switch (stream) {
 780         case SNDRV_PCM_STREAM_PLAYBACK:
 781                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 782                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 783                                 if (SUBSTREAM_BUSY(substream))
 784                                         return -EAGAIN;
 785                         }
 786                 }
 787                 break;
 788         case SNDRV_PCM_STREAM_CAPTURE:
 789                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 790                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 791                                 if (SUBSTREAM_BUSY(substream))
 792                                         return -EAGAIN;
 793                         }
 794                 }
 795                 break;
 796         default:
 797                 return -EINVAL;
 798         }
 799
 800         if (prefer_subdevice >= 0) {
 801                 for (substream = pstr->substream; substream; substream = substream->next)
 802                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 803                                 goto __ok;
 804         }
 805         for (substream = pstr->substream; substream; substream = substream->next)
 806                 if (!SUBSTREAM_BUSY(substream))
 807                         break;
 808       __ok:
 809         if (substream == NULL)
 810                 return -EAGAIN;
 811
 812         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 813         if (runtime == NULL)
 814                 return -ENOMEM;
 815
 816         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 817         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 818         if (runtime->status == NULL) {
 819                 kfree(runtime);
 820                 return -ENOMEM;
 821         }
 822         memset((void*)runtime->status, 0, size);
 823
 824         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 825         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 826         if (runtime->control == NULL) {
 827                 snd_free_pages((void*)runtime->status,
 828                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 829                 kfree(runtime);
 830                 return -ENOMEM;
 831         }
 832         memset((void*)runtime->control, 0, size);
 833
 834         init_waitqueue_head(&runtime->sleep);
 835         atomic_set(&runtime->mmap_count, 0);
 836         init_timer(&runtime->tick_timer);
 837         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 838         runtime->tick_timer.data = (unsigned long) substream;
 839
 840         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 841
 842         substream->runtime = runtime;
 843         substream->private_data = pcm->private_data;
 844         pstr->substream_opened++;
 845         *rsubstream = substream;
 846         return 0;
 847 }
 848
 849 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
 850 {
 851         struct snd_pcm_runtime *runtime;
 852         substream->file = NULL;
 853         runtime = substream->runtime;
 854         snd_assert(runtime != NULL, return);
 855         if (runtime->private_free != NULL)
 856                 runtime->private_free(runtime);
 857         snd_free_pages((void*)runtime->status,
 858                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 859         snd_free_pages((void*)runtime->control,
 860                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 861         kfree(runtime->hw_constraints.rules);
 862         kfree(runtime);
 863         substream->runtime = NULL;
 864         substream->pstr->substream_opened--;
 865 }
 866
 867 static int snd_pcm_dev_register(struct snd_device *device)
 868 {
 869         int idx, cidx, err;
 870         unsigned short minor;
 871         struct snd_pcm_substream *substream;
 872         struct list_head *list;
 873         char str[16];
 874         struct snd_pcm *pcm = device->device_data;
 875
 876         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 877         down(&register_mutex);
 878         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 879         if (snd_pcm_devices[idx]) {
 880                 up(&register_mutex);
 881                 return -EBUSY;
 882         }
 883         snd_pcm_devices[idx] = pcm;
 884         for (cidx = 0; cidx < 2; cidx++) {
 885                 int devtype = -1;
 886                 if (pcm->streams[cidx].substream == NULL)
 887                         continue;
 888                 switch (cidx) {
 889                 case SNDRV_PCM_STREAM_PLAYBACK:
 890                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 891                         minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
 892                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 893                         break;
 894                 case SNDRV_PCM_STREAM_CAPTURE:
 895                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 896                         minor = SNDRV_MINOR_PCM_CAPTURE + idx;
 897                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 898                         break;
 899                 }
 900                 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
 901                         snd_pcm_devices[idx] = NULL;
 902                         up(&register_mutex);
 903                         return err;
 904                 }
 905                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 906                         snd_pcm_timer_init(substream);
 907         }
 908         list_for_each(list, &snd_pcm_notify_list) {
 909                 struct snd_pcm_notify *notify;
 910                 notify = list_entry(list, struct snd_pcm_notify, list);
 911                 notify->n_register(pcm);
 912         }
 913         up(&register_mutex);
 914         return 0;
 915 }
 916
 917 static int snd_pcm_dev_disconnect(struct snd_device *device)
 918 {
 919         struct snd_pcm *pcm = device->device_data;
 920         struct list_head *list;
 921         struct snd_pcm_substream *substream;
 922         int idx, cidx;
 923
 924         down(&register_mutex);
 925         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 926         snd_pcm_devices[idx] = NULL;
 927         for (cidx = 0; cidx < 2; cidx++)
 928                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 929                         if (substream->runtime)
 930                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 931         list_for_each(list, &snd_pcm_notify_list) {
 932                 struct snd_pcm_notify *notify;
 933                 notify = list_entry(list, struct snd_pcm_notify, list);
 934                 notify->n_disconnect(pcm);
 935         }
 936         up(&register_mutex);
 937         return 0;
 938 }
 939
 940 static int snd_pcm_dev_unregister(struct snd_device *device)
 941 {
 942         int idx, cidx, devtype;
 943         struct snd_pcm_substream *substream;
 944         struct list_head *list;
 945         struct snd_pcm *pcm = device->device_data;
 946
 947         snd_assert(pcm != NULL, return -ENXIO);
 948         down(&register_mutex);
 949         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 950         snd_pcm_devices[idx] = NULL;
 951         for (cidx = 0; cidx < 2; cidx++) {
 952                 devtype = -1;
 953                 switch (cidx) {
 954                 case SNDRV_PCM_STREAM_PLAYBACK:
 955                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 956                         break;
 957                 case SNDRV_PCM_STREAM_CAPTURE:
 958                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 959                         break;
 960                 }
 961                 snd_unregister_device(devtype, pcm->card, pcm->device);
 962                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 963                         snd_pcm_timer_done(substream);
 964         }
 965         list_for_each(list, &snd_pcm_notify_list) {
 966                 struct snd_pcm_notify *notify;
 967                 notify = list_entry(list, struct snd_pcm_notify, list);
 968                 notify->n_unregister(pcm);
 969         }
 970         up(&register_mutex);
 971         return snd_pcm_free(pcm);
 972 }
 973
 974 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
 975 {
 976         int idx;
 977
 978         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
 979         down(&register_mutex);
 980         if (nfree) {
 981                 list_del(&notify->list);
 982                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 983                         if (snd_pcm_devices[idx] == NULL)
 984                                 continue;
 985                         notify->n_unregister(snd_pcm_devices[idx]);
 986                 }
 987         } else {
 988                 list_add_tail(&notify->list, &snd_pcm_notify_list);
 989                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 990                         if (snd_pcm_devices[idx] == NULL)
 991                                 continue;
 992                         notify->n_register(snd_pcm_devices[idx]);
 993                 }
 994         }
 995         up(&register_mutex);
 996         return 0;
 997 }
 998
 999 /*
1000  *  Info interface
1001  */
1002
1003 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1004                               struct snd_info_buffer *buffer)
1005 {
1006         int idx;
1007         struct snd_pcm *pcm;
1008
1009         down(&register_mutex);
1010         for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
1011                 pcm = snd_pcm_devices[idx];
1012                 if (pcm == NULL)
1013                         continue;
1014                 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
1015                             idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
1016                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1017                         snd_iprintf(buffer, " : playback %i",
1018                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1019                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1020                         snd_iprintf(buffer, " : capture %i",
1021                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1022                 snd_iprintf(buffer, "\n");
1023         }
1024         up(&register_mutex);
1025 }
1026
1027 /*
1028  *  ENTRY functions
1029  */
1030
1031 static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1032
1033 static int __init alsa_pcm_init(void)
1034 {
1035         struct snd_info_entry *entry;
1036
1037         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1038         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1039         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1040                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128,
1041                                       snd_pcm_proc_read);
1042                 if (snd_info_register(entry) < 0) {
1043                         snd_info_free_entry(entry);
1044                         entry = NULL;
1045                 }
1046         }
1047         snd_pcm_proc_entry = entry;
1048         return 0;
1049 }
1050
1051 static void __exit alsa_pcm_exit(void)
1052 {
1053         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1054         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1055         if (snd_pcm_proc_entry) {
1056                 snd_info_unregister(snd_pcm_proc_entry);
1057                 snd_pcm_proc_entry = NULL;
1058         }
1059 }
1060
1061 module_init(alsa_pcm_init)
1062 module_exit(alsa_pcm_exit)
1063
1064 EXPORT_SYMBOL(snd_pcm_devices);
1065 EXPORT_SYMBOL(snd_pcm_new);
1066 EXPORT_SYMBOL(snd_pcm_new_stream);
1067 EXPORT_SYMBOL(snd_pcm_notify);
1068 EXPORT_SYMBOL(snd_pcm_open_substream);
1069 EXPORT_SYMBOL(snd_pcm_release_substream);
1070 EXPORT_SYMBOL(snd_pcm_format_name);
1071   /* pcm_native.c */
1072 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1073 #ifdef CONFIG_PM
1074 EXPORT_SYMBOL(snd_pcm_suspend);
1075 EXPORT_SYMBOL(snd_pcm_suspend_all);
1076 #endif
1077 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1078 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1079 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1080 EXPORT_SYMBOL(snd_pcm_mmap_data);
1081 #if SNDRV_PCM_INFO_MMAP_IOMEM
1082 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1083 #endif
1084  /* pcm_misc.c */
1085 EXPORT_SYMBOL(snd_pcm_format_signed);
1086 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1087 EXPORT_SYMBOL(snd_pcm_format_linear);
1088 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1089 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1090 EXPORT_SYMBOL(snd_pcm_format_width);
1091 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1092 EXPORT_SYMBOL(snd_pcm_format_size);
1093 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1094 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1095 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1096 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);