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