git.oblomov.eu Git - linux-2.6/blob - sound/core/pcm.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/mutex.h>
  27 #include <sound/core.h>
  28 #include <sound/minors.h>
  29 #include <sound/pcm.h>
  30 #include <sound/control.h>
  31 #include <sound/info.h>
  32
  33 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  35 MODULE_LICENSE("GPL");
  36
  37 static LIST_HEAD(snd_pcm_devices);
  38 static LIST_HEAD(snd_pcm_notify_list);
  39 static DEFINE_MUTEX(register_mutex);
  40
  41 static int snd_pcm_free(struct snd_pcm *pcm);
  42 static int snd_pcm_dev_free(struct snd_device *device);
  43 static int snd_pcm_dev_register(struct snd_device *device);
  44 static int snd_pcm_dev_disconnect(struct snd_device *device);
  45
  46 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
  47 {
  48         struct snd_pcm *pcm;
  49
  50         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  51                 if (pcm->card == card && pcm->device == device)
  52                         return pcm;
  53         }
  54         return NULL;
  55 }
  56
  57 static int snd_pcm_control_ioctl(struct snd_card *card,
  58                                  struct snd_ctl_file *control,
  59                                  unsigned int cmd, unsigned long arg)
  60 {
  61         switch (cmd) {
  62         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  63                 {
  64                         int device;
  65
  66                         if (get_user(device, (int __user *)arg))
  67                                 return -EFAULT;
  68                         mutex_lock(&register_mutex);
  69                         device = device < 0 ? 0 : device + 1;
  70                         while (device < SNDRV_PCM_DEVICES) {
  71                                 if (snd_pcm_search(card, device))
  72                                         break;
  73                                 device++;
  74                         }
  75                         if (device == SNDRV_PCM_DEVICES)
  76                                 device = -1;
  77                         mutex_unlock(&register_mutex);
  78                         if (put_user(device, (int __user *)arg))
  79                                 return -EFAULT;
  80                         return 0;
  81                 }
  82         case SNDRV_CTL_IOCTL_PCM_INFO:
  83                 {
  84                         struct snd_pcm_info __user *info;
  85                         unsigned int device, subdevice;
  86                         int stream;
  87                         struct snd_pcm *pcm;
  88                         struct snd_pcm_str *pstr;
  89                         struct snd_pcm_substream *substream;
  90                         int err;
  91
  92                         info = (struct snd_pcm_info __user *)arg;
  93                         if (get_user(device, &info->device))
  94                                 return -EFAULT;
  95                         if (get_user(stream, &info->stream))
  96                                 return -EFAULT;
  97                         if (stream < 0 || stream > 1)
  98                                 return -EINVAL;
  99                         if (get_user(subdevice, &info->subdevice))
 100                                 return -EFAULT;
 101                         mutex_lock(&register_mutex);
 102                         pcm = snd_pcm_search(card, device);
 103                         if (pcm == NULL) {
 104                                 err = -ENXIO;
 105                                 goto _error;
 106                         }
 107                         pstr = &pcm->streams[stream];
 108                         if (pstr->substream_count == 0) {
 109                                 err = -ENOENT;
 110                                 goto _error;
 111                         }
 112                         if (subdevice >= pstr->substream_count) {
 113                                 err = -ENXIO;
 114                                 goto _error;
 115                         }
 116                         for (substream = pstr->substream; substream;
 117                              substream = substream->next)
 118                                 if (substream->number == (int)subdevice)
 119                                         break;
 120                         if (substream == NULL) {
 121                                 err = -ENXIO;
 122                                 goto _error;
 123                         }
 124                         err = snd_pcm_info_user(substream, info);
 125                 _error:
 126                         mutex_unlock(&register_mutex);
 127                         return err;
 128                 }
 129         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 130                 {
 131                         int val;
 132
 133                         if (get_user(val, (int __user *)arg))
 134                                 return -EFAULT;
 135                         control->prefer_pcm_subdevice = val;
 136                         return 0;
 137                 }
 138         }
 139         return -ENOIOCTLCMD;
 140 }
 141
 142 #ifdef CONFIG_SND_VERBOSE_PROCFS
 143
 144 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 145 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 146 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 147 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 148 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 149 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 150 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 151 #define START(v) [SNDRV_PCM_START_##v] = #v
 152 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 153 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 154
 155 static char *snd_pcm_format_names[] = {
 156         FORMAT(S8),
 157         FORMAT(U8),
 158         FORMAT(S16_LE),
 159         FORMAT(S16_BE),
 160         FORMAT(U16_LE),
 161         FORMAT(U16_BE),
 162         FORMAT(S24_LE),
 163         FORMAT(S24_BE),
 164         FORMAT(U24_LE),
 165         FORMAT(U24_BE),
 166         FORMAT(S32_LE),
 167         FORMAT(S32_BE),
 168         FORMAT(U32_LE),
 169         FORMAT(U32_BE),
 170         FORMAT(FLOAT_LE),
 171         FORMAT(FLOAT_BE),
 172         FORMAT(FLOAT64_LE),
 173         FORMAT(FLOAT64_BE),
 174         FORMAT(IEC958_SUBFRAME_LE),
 175         FORMAT(IEC958_SUBFRAME_BE),
 176         FORMAT(MU_LAW),
 177         FORMAT(A_LAW),
 178         FORMAT(IMA_ADPCM),
 179         FORMAT(MPEG),
 180         FORMAT(GSM),
 181         FORMAT(SPECIAL),
 182         FORMAT(S24_3LE),
 183         FORMAT(S24_3BE),
 184         FORMAT(U24_3LE),
 185         FORMAT(U24_3BE),
 186         FORMAT(S20_3LE),
 187         FORMAT(S20_3BE),
 188         FORMAT(U20_3LE),
 189         FORMAT(U20_3BE),
 190         FORMAT(S18_3LE),
 191         FORMAT(S18_3BE),
 192         FORMAT(U18_3LE),
 193         FORMAT(U18_3BE),
 194 };
 195
 196 static const char *snd_pcm_format_name(snd_pcm_format_t format)
 197 {
 198         return snd_pcm_format_names[format];
 199 }
 200
 201 static char *snd_pcm_stream_names[] = {
 202         STREAM(PLAYBACK),
 203         STREAM(CAPTURE),
 204 };
 205
 206 static char *snd_pcm_state_names[] = {
 207         STATE(OPEN),
 208         STATE(SETUP),
 209         STATE(PREPARED),
 210         STATE(RUNNING),
 211         STATE(XRUN),
 212         STATE(DRAINING),
 213         STATE(PAUSED),
 214         STATE(SUSPENDED),
 215 };
 216
 217 static char *snd_pcm_access_names[] = {
 218         ACCESS(MMAP_INTERLEAVED),
 219         ACCESS(MMAP_NONINTERLEAVED),
 220         ACCESS(MMAP_COMPLEX),
 221         ACCESS(RW_INTERLEAVED),
 222         ACCESS(RW_NONINTERLEAVED),
 223 };
 224
 225 static char *snd_pcm_subformat_names[] = {
 226         SUBFORMAT(STD),
 227 };
 228
 229 static char *snd_pcm_tstamp_mode_names[] = {
 230         TSTAMP(NONE),
 231         TSTAMP(MMAP),
 232 };
 233
 234 static const char *snd_pcm_stream_name(int stream)
 235 {
 236         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 237         return snd_pcm_stream_names[stream];
 238 }
 239
 240 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 241 {
 242         return snd_pcm_access_names[access];
 243 }
 244
 245 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 246 {
 247         return snd_pcm_subformat_names[subformat];
 248 }
 249
 250 static const char *snd_pcm_tstamp_mode_name(int mode)
 251 {
 252         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 253         return snd_pcm_tstamp_mode_names[mode];
 254 }
 255
 256 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 257 {
 258         return snd_pcm_state_names[state];
 259 }
 260
 261 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 262 #include <linux/soundcard.h>
 263
 264 static const char *snd_pcm_oss_format_name(int format)
 265 {
 266         switch (format) {
 267         case AFMT_MU_LAW:
 268                 return "MU_LAW";
 269         case AFMT_A_LAW:
 270                 return "A_LAW";
 271         case AFMT_IMA_ADPCM:
 272                 return "IMA_ADPCM";
 273         case AFMT_U8:
 274                 return "U8";
 275         case AFMT_S16_LE:
 276                 return "S16_LE";
 277         case AFMT_S16_BE:
 278                 return "S16_BE";
 279         case AFMT_S8:
 280                 return "S8";
 281         case AFMT_U16_LE:
 282                 return "U16_LE";
 283         case AFMT_U16_BE:
 284                 return "U16_BE";
 285         case AFMT_MPEG:
 286                 return "MPEG";
 287         default:
 288                 return "unknown";
 289         }
 290 }
 291 #endif
 292
 293 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 294                                    struct snd_info_buffer *buffer)
 295 {
 296         struct snd_pcm_info *info;
 297         int err;
 298
 299         if (! substream)
 300                 return;
 301
 302         info = kmalloc(sizeof(*info), GFP_KERNEL);
 303         if (! info) {
 304                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 305                 return;
 306         }
 307
 308         err = snd_pcm_info(substream, info);
 309         if (err < 0) {
 310                 snd_iprintf(buffer, "error %d\n", err);
 311                 kfree(info);
 312                 return;
 313         }
 314         snd_iprintf(buffer, "card: %d\n", info->card);
 315         snd_iprintf(buffer, "device: %d\n", info->device);
 316         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 317         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 318         snd_iprintf(buffer, "id: %s\n", info->id);
 319         snd_iprintf(buffer, "name: %s\n", info->name);
 320         snd_iprintf(buffer, "subname: %s\n", info->subname);
 321         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 322         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 323         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 324         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 325         kfree(info);
 326 }
 327
 328 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 329                                           struct snd_info_buffer *buffer)
 330 {
 331         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 332                                buffer);
 333 }
 334
 335 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 336                                              struct snd_info_buffer *buffer)
 337 {
 338         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 339                                buffer);
 340 }
 341
 342 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 343                                                   struct snd_info_buffer *buffer)
 344 {
 345         struct snd_pcm_substream *substream = entry->private_data;
 346         struct snd_pcm_runtime *runtime = substream->runtime;
 347         if (!runtime) {
 348                 snd_iprintf(buffer, "closed\n");
 349                 return;
 350         }
 351         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 352                 snd_iprintf(buffer, "no setup\n");
 353                 return;
 354         }
 355         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 356         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 357         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 358         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 359         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 360         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 361         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 362         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 363 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 364         if (substream->oss.oss) {
 365                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 366                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 367                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 368                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 369                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 370                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 371         }
 372 #endif
 373 }
 374
 375 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 376                                                   struct snd_info_buffer *buffer)
 377 {
 378         struct snd_pcm_substream *substream = entry->private_data;
 379         struct snd_pcm_runtime *runtime = substream->runtime;
 380         if (!runtime) {
 381                 snd_iprintf(buffer, "closed\n");
 382                 return;
 383         }
 384         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 385                 snd_iprintf(buffer, "no setup\n");
 386                 return;
 387         }
 388         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 389         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 390         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 391         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 392         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 393         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 394         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 395         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 396         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 397         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 398 }
 399
 400 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 401                                                struct snd_info_buffer *buffer)
 402 {
 403         struct snd_pcm_substream *substream = entry->private_data;
 404         struct snd_pcm_runtime *runtime = substream->runtime;
 405         struct snd_pcm_status status;
 406         int err;
 407         if (!runtime) {
 408                 snd_iprintf(buffer, "closed\n");
 409                 return;
 410         }
 411         memset(&status, 0, sizeof(status));
 412         err = snd_pcm_status(substream, &status);
 413         if (err < 0) {
 414                 snd_iprintf(buffer, "error %d\n", err);
 415                 return;
 416         }
 417         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 418         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 419                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 420         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 421                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 422         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 423         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 424         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 425         snd_iprintf(buffer, "-----\n");
 426         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 427         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 428 }
 429
 430 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 431 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 432                                     struct snd_info_buffer *buffer)
 433 {
 434         struct snd_pcm_str *pstr = entry->private_data;
 435         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 436 }
 437
 438 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 439                                      struct snd_info_buffer *buffer)
 440 {
 441         struct snd_pcm_str *pstr = entry->private_data;
 442         char line[64];
 443         if (!snd_info_get_line(buffer, line, sizeof(line)))
 444                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 445 }
 446 #endif
 447
 448 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 449 {
 450         struct snd_pcm *pcm = pstr->pcm;
 451         struct snd_info_entry *entry;
 452         char name[16];
 453
 454         sprintf(name, "pcm%i%c", pcm->device,
 455                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 456         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 457                 return -ENOMEM;
 458         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 459         if (snd_info_register(entry) < 0) {
 460                 snd_info_free_entry(entry);
 461                 return -ENOMEM;
 462         }
 463         pstr->proc_root = entry;
 464
 465         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 466                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 467                 if (snd_info_register(entry) < 0) {
 468                         snd_info_free_entry(entry);
 469                         entry = NULL;
 470                 }
 471         }
 472         pstr->proc_info_entry = entry;
 473
 474 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 475         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 476                                                 pstr->proc_root)) != NULL) {
 477                 entry->c.text.read = snd_pcm_xrun_debug_read;
 478                 entry->c.text.write = snd_pcm_xrun_debug_write;
 479                 entry->mode |= S_IWUSR;
 480                 entry->private_data = pstr;
 481                 if (snd_info_register(entry) < 0) {
 482                         snd_info_free_entry(entry);
 483                         entry = NULL;
 484                 }
 485         }
 486         pstr->proc_xrun_debug_entry = entry;
 487 #endif
 488         return 0;
 489 }
 490
 491 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 492 {
 493 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 494         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 495         pstr->proc_xrun_debug_entry = NULL;
 496 #endif
 497         snd_info_free_entry(pstr->proc_info_entry);
 498         pstr->proc_info_entry = NULL;
 499         snd_info_free_entry(pstr->proc_root);
 500         pstr->proc_root = NULL;
 501         return 0;
 502 }
 503
 504 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 505 {
 506         struct snd_info_entry *entry;
 507         struct snd_card *card;
 508         char name[16];
 509
 510         card = substream->pcm->card;
 511
 512         sprintf(name, "sub%i", substream->number);
 513         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 514                 return -ENOMEM;
 515         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 516         if (snd_info_register(entry) < 0) {
 517                 snd_info_free_entry(entry);
 518                 return -ENOMEM;
 519         }
 520         substream->proc_root = entry;
 521
 522         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 523                 snd_info_set_text_ops(entry, substream,
 524                                       snd_pcm_substream_proc_info_read);
 525                 if (snd_info_register(entry) < 0) {
 526                         snd_info_free_entry(entry);
 527                         entry = NULL;
 528                 }
 529         }
 530         substream->proc_info_entry = entry;
 531
 532         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 533                 snd_info_set_text_ops(entry, substream,
 534                                       snd_pcm_substream_proc_hw_params_read);
 535                 if (snd_info_register(entry) < 0) {
 536                         snd_info_free_entry(entry);
 537                         entry = NULL;
 538                 }
 539         }
 540         substream->proc_hw_params_entry = entry;
 541
 542         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 543                 snd_info_set_text_ops(entry, substream,
 544                                       snd_pcm_substream_proc_sw_params_read);
 545                 if (snd_info_register(entry) < 0) {
 546                         snd_info_free_entry(entry);
 547                         entry = NULL;
 548                 }
 549         }
 550         substream->proc_sw_params_entry = entry;
 551
 552         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 553                 snd_info_set_text_ops(entry, substream,
 554                                       snd_pcm_substream_proc_status_read);
 555                 if (snd_info_register(entry) < 0) {
 556                         snd_info_free_entry(entry);
 557                         entry = NULL;
 558                 }
 559         }
 560         substream->proc_status_entry = entry;
 561
 562         return 0;
 563 }
 564
 565 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 566 {
 567         snd_info_free_entry(substream->proc_info_entry);
 568         substream->proc_info_entry = NULL;
 569         snd_info_free_entry(substream->proc_hw_params_entry);
 570         substream->proc_hw_params_entry = NULL;
 571         snd_info_free_entry(substream->proc_sw_params_entry);
 572         substream->proc_sw_params_entry = NULL;
 573         snd_info_free_entry(substream->proc_status_entry);
 574         substream->proc_status_entry = NULL;
 575         snd_info_free_entry(substream->proc_root);
 576         substream->proc_root = NULL;
 577         return 0;
 578 }
 579 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 580 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 581 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 582 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 583 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 584 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 585
 586 /**
 587  * snd_pcm_new_stream - create a new PCM stream
 588  * @pcm: the pcm instance
 589  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 590  * @substream_count: the number of substreams
 591  *
 592  * Creates a new stream for the pcm.
 593  * The corresponding stream on the pcm must have been empty before
 594  * calling this, i.e. zero must be given to the argument of
 595  * snd_pcm_new().
 596  *
 597  * Returns zero if successful, or a negative error code on failure.
 598  */
 599 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 600 {
 601         int idx, err;
 602         struct snd_pcm_str *pstr = &pcm->streams[stream];
 603         struct snd_pcm_substream *substream, *prev;
 604
 605 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 606         mutex_init(&pstr->oss.setup_mutex);
 607 #endif
 608         pstr->stream = stream;
 609         pstr->pcm = pcm;
 610         pstr->substream_count = substream_count;
 611         if (substream_count > 0) {
 612                 err = snd_pcm_stream_proc_init(pstr);
 613                 if (err < 0) {
 614                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 615                         return err;
 616                 }
 617         }
 618         prev = NULL;
 619         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 620                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 621                 if (substream == NULL) {
 622                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 623                         return -ENOMEM;
 624                 }
 625                 substream->pcm = pcm;
 626                 substream->pstr = pstr;
 627                 substream->number = idx;
 628                 substream->stream = stream;
 629                 sprintf(substream->name, "subdevice #%i", idx);
 630                 snprintf(substream->latency_id, sizeof(substream->latency_id),
 631                          "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
 632                          (stream ? 'c' : 'p'), idx);
 633                 substream->buffer_bytes_max = UINT_MAX;
 634                 if (prev == NULL)
 635                         pstr->substream = substream;
 636                 else
 637                         prev->next = substream;
 638                 err = snd_pcm_substream_proc_init(substream);
 639                 if (err < 0) {
 640                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 641                         if (prev == NULL)
 642                                 pstr->substream = NULL;
 643                         else
 644                                 prev->next = NULL;
 645                         kfree(substream);
 646                         return err;
 647                 }
 648                 substream->group = &substream->self_group;
 649                 spin_lock_init(&substream->self_group.lock);
 650                 INIT_LIST_HEAD(&substream->self_group.substreams);
 651                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 652                 spin_lock_init(&substream->timer_lock);
 653                 atomic_set(&substream->mmap_count, 0);
 654                 prev = substream;
 655         }
 656         return 0;
 657 }
 658
 659 EXPORT_SYMBOL(snd_pcm_new_stream);
 660
 661 /**
 662  * snd_pcm_new - create a new PCM instance
 663  * @card: the card instance
 664  * @id: the id string
 665  * @device: the device index (zero based)
 666  * @playback_count: the number of substreams for playback
 667  * @capture_count: the number of substreams for capture
 668  * @rpcm: the pointer to store the new pcm instance
 669  *
 670  * Creates a new PCM instance.
 671  *
 672  * The pcm operators have to be set afterwards to the new instance
 673  * via snd_pcm_set_ops().
 674  *
 675  * Returns zero if successful, or a negative error code on failure.
 676  */
 677 int snd_pcm_new(struct snd_card *card, char *id, int device,
 678                 int playback_count, int capture_count,
 679                 struct snd_pcm ** rpcm)
 680 {
 681         struct snd_pcm *pcm;
 682         int err;
 683         static struct snd_device_ops ops = {
 684                 .dev_free = snd_pcm_dev_free,
 685                 .dev_register = snd_pcm_dev_register,
 686                 .dev_disconnect = snd_pcm_dev_disconnect,
 687         };
 688
 689         snd_assert(rpcm != NULL, return -EINVAL);
 690         *rpcm = NULL;
 691         snd_assert(card != NULL, return -ENXIO);
 692         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 693         if (pcm == NULL) {
 694                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 695                 return -ENOMEM;
 696         }
 697         pcm->card = card;
 698         pcm->device = device;
 699         if (id)
 700                 strlcpy(pcm->id, id, sizeof(pcm->id));
 701         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 702                 snd_pcm_free(pcm);
 703                 return err;
 704         }
 705         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 706                 snd_pcm_free(pcm);
 707                 return err;
 708         }
 709         mutex_init(&pcm->open_mutex);
 710         init_waitqueue_head(&pcm->open_wait);
 711         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 712                 snd_pcm_free(pcm);
 713                 return err;
 714         }
 715         *rpcm = pcm;
 716         return 0;
 717 }
 718
 719 EXPORT_SYMBOL(snd_pcm_new);
 720
 721 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 722 {
 723         struct snd_pcm_substream *substream, *substream_next;
 724 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 725         struct snd_pcm_oss_setup *setup, *setupn;
 726 #endif
 727         substream = pstr->substream;
 728         while (substream) {
 729                 substream_next = substream->next;
 730                 snd_pcm_timer_done(substream);
 731                 snd_pcm_substream_proc_done(substream);
 732                 kfree(substream);
 733                 substream = substream_next;
 734         }
 735         snd_pcm_stream_proc_done(pstr);
 736 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 737         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 738                 setupn = setup->next;
 739                 kfree(setup->task_name);
 740                 kfree(setup);
 741         }
 742 #endif
 743 }
 744
 745 static int snd_pcm_free(struct snd_pcm *pcm)
 746 {
 747         struct snd_pcm_notify *notify;
 748
 749         snd_assert(pcm != NULL, return -ENXIO);
 750         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 751                 notify->n_unregister(pcm);
 752         }
 753         if (pcm->private_free)
 754                 pcm->private_free(pcm);
 755         snd_pcm_lib_preallocate_free_for_all(pcm);
 756         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 757         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 758         kfree(pcm);
 759         return 0;
 760 }
 761
 762 static int snd_pcm_dev_free(struct snd_device *device)
 763 {
 764         struct snd_pcm *pcm = device->device_data;
 765         return snd_pcm_free(pcm);
 766 }
 767
 768 static void snd_pcm_tick_timer_func(unsigned long data)
 769 {
 770         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
 771         snd_pcm_tick_elapsed(substream);
 772 }
 773
 774 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 775                              struct file *file,
 776                              struct snd_pcm_substream **rsubstream)
 777 {
 778         struct snd_pcm_str * pstr;
 779         struct snd_pcm_substream *substream;
 780         struct snd_pcm_runtime *runtime;
 781         struct snd_ctl_file *kctl;
 782         struct snd_card *card;
 783         int prefer_subdevice = -1;
 784         size_t size;
 785
 786         snd_assert(rsubstream != NULL, return -EINVAL);
 787         *rsubstream = NULL;
 788         snd_assert(pcm != NULL, return -ENXIO);
 789         pstr = &pcm->streams[stream];
 790         if (pstr->substream == NULL || pstr->substream_count == 0)
 791                 return -ENODEV;
 792
 793         card = pcm->card;
 794         down_read(&card->controls_rwsem);
 795         list_for_each_entry(kctl, &card->ctl_files, list) {
 796                 if (kctl->pid == current->pid) {
 797                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 798                         if (prefer_subdevice != -1)
 799                                 break;
 800                 }
 801         }
 802         up_read(&card->controls_rwsem);
 803
 804         switch (stream) {
 805         case SNDRV_PCM_STREAM_PLAYBACK:
 806                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 807                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 808                                 if (SUBSTREAM_BUSY(substream))
 809                                         return -EAGAIN;
 810                         }
 811                 }
 812                 break;
 813         case SNDRV_PCM_STREAM_CAPTURE:
 814                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 815                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 816                                 if (SUBSTREAM_BUSY(substream))
 817                                         return -EAGAIN;
 818                         }
 819                 }
 820                 break;
 821         default:
 822                 return -EINVAL;
 823         }
 824
 825         if (file->f_flags & O_APPEND) {
 826                 if (prefer_subdevice < 0) {
 827                         if (pstr->substream_count > 1)
 828                                 return -EINVAL; /* must be unique */
 829                         substream = pstr->substream;
 830                 } else {
 831                         for (substream = pstr->substream; substream;
 832                              substream = substream->next)
 833                                 if (substream->number == prefer_subdevice)
 834                                         break;
 835                 }
 836                 if (! substream)
 837                         return -ENODEV;
 838                 if (! SUBSTREAM_BUSY(substream))
 839                         return -EBADFD;
 840                 substream->ref_count++;
 841                 *rsubstream = substream;
 842                 return 0;
 843         }
 844
 845         if (prefer_subdevice >= 0) {
 846                 for (substream = pstr->substream; substream; substream = substream->next)
 847                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 848                                 goto __ok;
 849         }
 850         for (substream = pstr->substream; substream; substream = substream->next)
 851                 if (!SUBSTREAM_BUSY(substream))
 852                         break;
 853       __ok:
 854         if (substream == NULL)
 855                 return -EAGAIN;
 856
 857         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 858         if (runtime == NULL)
 859                 return -ENOMEM;
 860
 861         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 862         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 863         if (runtime->status == NULL) {
 864                 kfree(runtime);
 865                 return -ENOMEM;
 866         }
 867         memset((void*)runtime->status, 0, size);
 868
 869         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 870         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 871         if (runtime->control == NULL) {
 872                 snd_free_pages((void*)runtime->status,
 873                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 874                 kfree(runtime);
 875                 return -ENOMEM;
 876         }
 877         memset((void*)runtime->control, 0, size);
 878
 879         init_waitqueue_head(&runtime->sleep);
 880         init_timer(&runtime->tick_timer);
 881         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 882         runtime->tick_timer.data = (unsigned long) substream;
 883
 884         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 885
 886         substream->runtime = runtime;
 887         substream->private_data = pcm->private_data;
 888         substream->ref_count = 1;
 889         substream->f_flags = file->f_flags;
 890         pstr->substream_opened++;
 891         *rsubstream = substream;
 892         return 0;
 893 }
 894
 895 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 896 {
 897         struct snd_pcm_runtime *runtime;
 898
 899         runtime = substream->runtime;
 900         snd_assert(runtime != NULL, return);
 901         if (runtime->private_free != NULL)
 902                 runtime->private_free(runtime);
 903         snd_free_pages((void*)runtime->status,
 904                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 905         snd_free_pages((void*)runtime->control,
 906                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 907         kfree(runtime->hw_constraints.rules);
 908         kfree(runtime);
 909         substream->runtime = NULL;
 910         substream->pstr->substream_opened--;
 911 }
 912
 913 static ssize_t show_pcm_class(struct device *dev,
 914                               struct device_attribute *attr, char *buf)
 915 {
 916         struct snd_pcm *pcm;
 917         const char *str;
 918         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
 919                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
 920                 [SNDRV_PCM_CLASS_MULTI] = "multi",
 921                 [SNDRV_PCM_CLASS_MODEM] = "modem",
 922                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
 923         };
 924
 925         if (! (pcm = dev_get_drvdata(dev)) ||
 926             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
 927                 str = "none";
 928         else
 929                 str = strs[pcm->dev_class];
 930         return snprintf(buf, PAGE_SIZE, "%s\n", str);
 931 }
 932
 933 static struct device_attribute pcm_attrs =
 934         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 935
 936 static int snd_pcm_dev_register(struct snd_device *device)
 937 {
 938         int cidx, err;
 939         struct snd_pcm_substream *substream;
 940         struct snd_pcm_notify *notify;
 941         char str[16];
 942         struct snd_pcm *pcm = device->device_data;
 943         struct device *dev;
 944
 945         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 946         mutex_lock(&register_mutex);
 947         if (snd_pcm_search(pcm->card, pcm->device)) {
 948                 mutex_unlock(&register_mutex);
 949                 return -EBUSY;
 950         }
 951         list_add_tail(&pcm->list, &snd_pcm_devices);
 952         for (cidx = 0; cidx < 2; cidx++) {
 953                 int devtype = -1;
 954                 if (pcm->streams[cidx].substream == NULL)
 955                         continue;
 956                 switch (cidx) {
 957                 case SNDRV_PCM_STREAM_PLAYBACK:
 958                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 959                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 960                         break;
 961                 case SNDRV_PCM_STREAM_CAPTURE:
 962                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 963                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 964                         break;
 965                 }
 966                 /* device pointer to use, pcm->dev takes precedence if
 967                  * it is assigned, otherwise fall back to card's device
 968                  * if possible */
 969                 dev = pcm->dev;
 970                 if (!dev)
 971                         dev = snd_card_get_device_link(pcm->card);
 972                 /* register pcm */
 973                 err = snd_register_device_for_dev(devtype, pcm->card,
 974                                                   pcm->device,
 975                                                   &snd_pcm_f_ops[cidx],
 976                                                   pcm, str, dev);
 977                 if (err < 0) {
 978                         list_del(&pcm->list);
 979                         mutex_unlock(&register_mutex);
 980                         return err;
 981                 }
 982                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
 983                                           &pcm_attrs);
 984                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 985                         snd_pcm_timer_init(substream);
 986         }
 987
 988         list_for_each_entry(notify, &snd_pcm_notify_list, list)
 989                 notify->n_register(pcm);
 990
 991         mutex_unlock(&register_mutex);
 992         return 0;
 993 }
 994
 995 static int snd_pcm_dev_disconnect(struct snd_device *device)
 996 {
 997         struct snd_pcm *pcm = device->device_data;
 998         struct snd_pcm_notify *notify;
 999         struct snd_pcm_substream *substream;
1000         int cidx, devtype;
1001
1002         mutex_lock(&register_mutex);
1003         if (list_empty(&pcm->list))
1004                 goto unlock;
1005
1006         list_del_init(&pcm->list);
1007         for (cidx = 0; cidx < 2; cidx++)
1008                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1009                         if (substream->runtime)
1010                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1011         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1012                 notify->n_disconnect(pcm);
1013         }
1014         for (cidx = 0; cidx < 2; cidx++) {
1015                 devtype = -1;
1016                 switch (cidx) {
1017                 case SNDRV_PCM_STREAM_PLAYBACK:
1018                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1019                         break;
1020                 case SNDRV_PCM_STREAM_CAPTURE:
1021                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1022                         break;
1023                 }
1024                 snd_unregister_device(devtype, pcm->card, pcm->device);
1025         }
1026  unlock:
1027         mutex_unlock(&register_mutex);
1028         return 0;
1029 }
1030
1031 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1032 {
1033         struct snd_pcm *pcm;
1034
1035         snd_assert(notify != NULL &&
1036                    notify->n_register != NULL &&
1037                    notify->n_unregister != NULL &&
1038                    notify->n_disconnect, return -EINVAL);
1039         mutex_lock(&register_mutex);
1040         if (nfree) {
1041                 list_del(&notify->list);
1042                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1043                         notify->n_unregister(pcm);
1044         } else {
1045                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1046                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1047                         notify->n_register(pcm);
1048         }
1049         mutex_unlock(&register_mutex);
1050         return 0;
1051 }
1052
1053 EXPORT_SYMBOL(snd_pcm_notify);
1054
1055 #ifdef CONFIG_PROC_FS
1056 /*
1057  *  Info interface
1058  */
1059
1060 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1061                               struct snd_info_buffer *buffer)
1062 {
1063         struct snd_pcm *pcm;
1064
1065         mutex_lock(&register_mutex);
1066         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1067                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1068                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1069                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1070                         snd_iprintf(buffer, " : playback %i",
1071                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1072                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1073                         snd_iprintf(buffer, " : capture %i",
1074                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1075                 snd_iprintf(buffer, "\n");
1076         }
1077         mutex_unlock(&register_mutex);
1078 }
1079
1080 static struct snd_info_entry *snd_pcm_proc_entry;
1081
1082 static void snd_pcm_proc_init(void)
1083 {
1084         struct snd_info_entry *entry;
1085
1086         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1087                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1088                 if (snd_info_register(entry) < 0) {
1089                         snd_info_free_entry(entry);
1090                         entry = NULL;
1091                 }
1092         }
1093         snd_pcm_proc_entry = entry;
1094 }
1095
1096 static void snd_pcm_proc_done(void)
1097 {
1098         snd_info_free_entry(snd_pcm_proc_entry);
1099 }
1100
1101 #else /* !CONFIG_PROC_FS */
1102 #define snd_pcm_proc_init()
1103 #define snd_pcm_proc_done()
1104 #endif /* CONFIG_PROC_FS */
1105
1106
1107 /*
1108  *  ENTRY functions
1109  */
1110
1111 static int __init alsa_pcm_init(void)
1112 {
1113         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1114         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1115         snd_pcm_proc_init();
1116         return 0;
1117 }
1118
1119 static void __exit alsa_pcm_exit(void)
1120 {
1121         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1122         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1123         snd_pcm_proc_done();
1124 }
1125
1126 module_init(alsa_pcm_init)
1127 module_exit(alsa_pcm_exit)