SAFE public projects git trees. - safe/jmp/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 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 363         if (substream->oss.oss) {
 364                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 365                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 366                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 367                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 368                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 369                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 370         }
 371 #endif
 372 }
 373
 374 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 375                                                   struct snd_info_buffer *buffer)
 376 {
 377         struct snd_pcm_substream *substream = entry->private_data;
 378         struct snd_pcm_runtime *runtime = substream->runtime;
 379         if (!runtime) {
 380                 snd_iprintf(buffer, "closed\n");
 381                 return;
 382         }
 383         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 384                 snd_iprintf(buffer, "no setup\n");
 385                 return;
 386         }
 387         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 388         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 389         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 390         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 391         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 392         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 393         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 394         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 395 }
 396
 397 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 398                                                struct snd_info_buffer *buffer)
 399 {
 400         struct snd_pcm_substream *substream = entry->private_data;
 401         struct snd_pcm_runtime *runtime = substream->runtime;
 402         struct snd_pcm_status status;
 403         int err;
 404         if (!runtime) {
 405                 snd_iprintf(buffer, "closed\n");
 406                 return;
 407         }
 408         memset(&status, 0, sizeof(status));
 409         err = snd_pcm_status(substream, &status);
 410         if (err < 0) {
 411                 snd_iprintf(buffer, "error %d\n", err);
 412                 return;
 413         }
 414         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 415         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 416                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 417         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 418                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 419         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 420         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 421         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 422         snd_iprintf(buffer, "-----\n");
 423         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 424         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 425 }
 426
 427 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 428 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 429                                     struct snd_info_buffer *buffer)
 430 {
 431         struct snd_pcm_str *pstr = entry->private_data;
 432         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 433 }
 434
 435 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 436                                      struct snd_info_buffer *buffer)
 437 {
 438         struct snd_pcm_str *pstr = entry->private_data;
 439         char line[64];
 440         if (!snd_info_get_line(buffer, line, sizeof(line)))
 441                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 442 }
 443 #endif
 444
 445 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 446 {
 447         struct snd_pcm *pcm = pstr->pcm;
 448         struct snd_info_entry *entry;
 449         char name[16];
 450
 451         sprintf(name, "pcm%i%c", pcm->device,
 452                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 453         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 454                 return -ENOMEM;
 455         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 456         if (snd_info_register(entry) < 0) {
 457                 snd_info_free_entry(entry);
 458                 return -ENOMEM;
 459         }
 460         pstr->proc_root = entry;
 461
 462         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 463                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 464                 if (snd_info_register(entry) < 0) {
 465                         snd_info_free_entry(entry);
 466                         entry = NULL;
 467                 }
 468         }
 469         pstr->proc_info_entry = entry;
 470
 471 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 472         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 473                                                 pstr->proc_root)) != NULL) {
 474                 entry->c.text.read = snd_pcm_xrun_debug_read;
 475                 entry->c.text.write = snd_pcm_xrun_debug_write;
 476                 entry->mode |= S_IWUSR;
 477                 entry->private_data = pstr;
 478                 if (snd_info_register(entry) < 0) {
 479                         snd_info_free_entry(entry);
 480                         entry = NULL;
 481                 }
 482         }
 483         pstr->proc_xrun_debug_entry = entry;
 484 #endif
 485         return 0;
 486 }
 487
 488 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 489 {
 490 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 491         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 492         pstr->proc_xrun_debug_entry = NULL;
 493 #endif
 494         snd_info_free_entry(pstr->proc_info_entry);
 495         pstr->proc_info_entry = NULL;
 496         snd_info_free_entry(pstr->proc_root);
 497         pstr->proc_root = NULL;
 498         return 0;
 499 }
 500
 501 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 502 {
 503         struct snd_info_entry *entry;
 504         struct snd_card *card;
 505         char name[16];
 506
 507         card = substream->pcm->card;
 508
 509         sprintf(name, "sub%i", substream->number);
 510         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 511                 return -ENOMEM;
 512         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 513         if (snd_info_register(entry) < 0) {
 514                 snd_info_free_entry(entry);
 515                 return -ENOMEM;
 516         }
 517         substream->proc_root = entry;
 518
 519         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 520                 snd_info_set_text_ops(entry, substream,
 521                                       snd_pcm_substream_proc_info_read);
 522                 if (snd_info_register(entry) < 0) {
 523                         snd_info_free_entry(entry);
 524                         entry = NULL;
 525                 }
 526         }
 527         substream->proc_info_entry = entry;
 528
 529         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 530                 snd_info_set_text_ops(entry, substream,
 531                                       snd_pcm_substream_proc_hw_params_read);
 532                 if (snd_info_register(entry) < 0) {
 533                         snd_info_free_entry(entry);
 534                         entry = NULL;
 535                 }
 536         }
 537         substream->proc_hw_params_entry = entry;
 538
 539         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 540                 snd_info_set_text_ops(entry, substream,
 541                                       snd_pcm_substream_proc_sw_params_read);
 542                 if (snd_info_register(entry) < 0) {
 543                         snd_info_free_entry(entry);
 544                         entry = NULL;
 545                 }
 546         }
 547         substream->proc_sw_params_entry = entry;
 548
 549         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 550                 snd_info_set_text_ops(entry, substream,
 551                                       snd_pcm_substream_proc_status_read);
 552                 if (snd_info_register(entry) < 0) {
 553                         snd_info_free_entry(entry);
 554                         entry = NULL;
 555                 }
 556         }
 557         substream->proc_status_entry = entry;
 558
 559         return 0;
 560 }
 561
 562 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 563 {
 564         snd_info_free_entry(substream->proc_info_entry);
 565         substream->proc_info_entry = NULL;
 566         snd_info_free_entry(substream->proc_hw_params_entry);
 567         substream->proc_hw_params_entry = NULL;
 568         snd_info_free_entry(substream->proc_sw_params_entry);
 569         substream->proc_sw_params_entry = NULL;
 570         snd_info_free_entry(substream->proc_status_entry);
 571         substream->proc_status_entry = NULL;
 572         snd_info_free_entry(substream->proc_root);
 573         substream->proc_root = NULL;
 574         return 0;
 575 }
 576 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 577 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 578 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 579 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 580 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 581 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 582
 583 /**
 584  * snd_pcm_new_stream - create a new PCM stream
 585  * @pcm: the pcm instance
 586  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 587  * @substream_count: the number of substreams
 588  *
 589  * Creates a new stream for the pcm.
 590  * The corresponding stream on the pcm must have been empty before
 591  * calling this, i.e. zero must be given to the argument of
 592  * snd_pcm_new().
 593  *
 594  * Returns zero if successful, or a negative error code on failure.
 595  */
 596 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 597 {
 598         int idx, err;
 599         struct snd_pcm_str *pstr = &pcm->streams[stream];
 600         struct snd_pcm_substream *substream, *prev;
 601
 602 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 603         mutex_init(&pstr->oss.setup_mutex);
 604 #endif
 605         pstr->stream = stream;
 606         pstr->pcm = pcm;
 607         pstr->substream_count = substream_count;
 608         if (substream_count > 0) {
 609                 err = snd_pcm_stream_proc_init(pstr);
 610                 if (err < 0) {
 611                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 612                         return err;
 613                 }
 614         }
 615         prev = NULL;
 616         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 617                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 618                 if (substream == NULL) {
 619                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 620                         return -ENOMEM;
 621                 }
 622                 substream->pcm = pcm;
 623                 substream->pstr = pstr;
 624                 substream->number = idx;
 625                 substream->stream = stream;
 626                 sprintf(substream->name, "subdevice #%i", idx);
 627                 snprintf(substream->latency_id, sizeof(substream->latency_id),
 628                          "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
 629                          (stream ? 'c' : 'p'), idx);
 630                 substream->buffer_bytes_max = UINT_MAX;
 631                 if (prev == NULL)
 632                         pstr->substream = substream;
 633                 else
 634                         prev->next = substream;
 635                 err = snd_pcm_substream_proc_init(substream);
 636                 if (err < 0) {
 637                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 638                         if (prev == NULL)
 639                                 pstr->substream = NULL;
 640                         else
 641                                 prev->next = NULL;
 642                         kfree(substream);
 643                         return err;
 644                 }
 645                 substream->group = &substream->self_group;
 646                 spin_lock_init(&substream->self_group.lock);
 647                 INIT_LIST_HEAD(&substream->self_group.substreams);
 648                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 649                 spin_lock_init(&substream->timer_lock);
 650                 atomic_set(&substream->mmap_count, 0);
 651                 prev = substream;
 652         }
 653         return 0;
 654 }
 655
 656 EXPORT_SYMBOL(snd_pcm_new_stream);
 657
 658 /**
 659  * snd_pcm_new - create a new PCM instance
 660  * @card: the card instance
 661  * @id: the id string
 662  * @device: the device index (zero based)
 663  * @playback_count: the number of substreams for playback
 664  * @capture_count: the number of substreams for capture
 665  * @rpcm: the pointer to store the new pcm instance
 666  *
 667  * Creates a new PCM instance.
 668  *
 669  * The pcm operators have to be set afterwards to the new instance
 670  * via snd_pcm_set_ops().
 671  *
 672  * Returns zero if successful, or a negative error code on failure.
 673  */
 674 int snd_pcm_new(struct snd_card *card, char *id, int device,
 675                 int playback_count, int capture_count,
 676                 struct snd_pcm ** rpcm)
 677 {
 678         struct snd_pcm *pcm;
 679         int err;
 680         static struct snd_device_ops ops = {
 681                 .dev_free = snd_pcm_dev_free,
 682                 .dev_register = snd_pcm_dev_register,
 683                 .dev_disconnect = snd_pcm_dev_disconnect,
 684         };
 685
 686         snd_assert(rpcm != NULL, return -EINVAL);
 687         *rpcm = NULL;
 688         snd_assert(card != NULL, return -ENXIO);
 689         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 690         if (pcm == NULL) {
 691                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 692                 return -ENOMEM;
 693         }
 694         pcm->card = card;
 695         pcm->device = device;
 696         if (id)
 697                 strlcpy(pcm->id, id, sizeof(pcm->id));
 698         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 699                 snd_pcm_free(pcm);
 700                 return err;
 701         }
 702         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 703                 snd_pcm_free(pcm);
 704                 return err;
 705         }
 706         mutex_init(&pcm->open_mutex);
 707         init_waitqueue_head(&pcm->open_wait);
 708         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 709                 snd_pcm_free(pcm);
 710                 return err;
 711         }
 712         *rpcm = pcm;
 713         return 0;
 714 }
 715
 716 EXPORT_SYMBOL(snd_pcm_new);
 717
 718 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 719 {
 720         struct snd_pcm_substream *substream, *substream_next;
 721 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 722         struct snd_pcm_oss_setup *setup, *setupn;
 723 #endif
 724         substream = pstr->substream;
 725         while (substream) {
 726                 substream_next = substream->next;
 727                 snd_pcm_timer_done(substream);
 728                 snd_pcm_substream_proc_done(substream);
 729                 kfree(substream);
 730                 substream = substream_next;
 731         }
 732         snd_pcm_stream_proc_done(pstr);
 733 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 734         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 735                 setupn = setup->next;
 736                 kfree(setup->task_name);
 737                 kfree(setup);
 738         }
 739 #endif
 740 }
 741
 742 static int snd_pcm_free(struct snd_pcm *pcm)
 743 {
 744         struct snd_pcm_notify *notify;
 745
 746         snd_assert(pcm != NULL, return -ENXIO);
 747         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 748                 notify->n_unregister(pcm);
 749         }
 750         if (pcm->private_free)
 751                 pcm->private_free(pcm);
 752         snd_pcm_lib_preallocate_free_for_all(pcm);
 753         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 754         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 755         kfree(pcm);
 756         return 0;
 757 }
 758
 759 static int snd_pcm_dev_free(struct snd_device *device)
 760 {
 761         struct snd_pcm *pcm = device->device_data;
 762         return snd_pcm_free(pcm);
 763 }
 764
 765 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 766                              struct file *file,
 767                              struct snd_pcm_substream **rsubstream)
 768 {
 769         struct snd_pcm_str * pstr;
 770         struct snd_pcm_substream *substream;
 771         struct snd_pcm_runtime *runtime;
 772         struct snd_ctl_file *kctl;
 773         struct snd_card *card;
 774         int prefer_subdevice = -1;
 775         size_t size;
 776
 777         snd_assert(rsubstream != NULL, return -EINVAL);
 778         *rsubstream = NULL;
 779         snd_assert(pcm != NULL, return -ENXIO);
 780         pstr = &pcm->streams[stream];
 781         if (pstr->substream == NULL || pstr->substream_count == 0)
 782                 return -ENODEV;
 783
 784         card = pcm->card;
 785         down_read(&card->controls_rwsem);
 786         list_for_each_entry(kctl, &card->ctl_files, list) {
 787                 if (kctl->pid == current->pid) {
 788                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 789                         if (prefer_subdevice != -1)
 790                                 break;
 791                 }
 792         }
 793         up_read(&card->controls_rwsem);
 794
 795         switch (stream) {
 796         case SNDRV_PCM_STREAM_PLAYBACK:
 797                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 798                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 799                                 if (SUBSTREAM_BUSY(substream))
 800                                         return -EAGAIN;
 801                         }
 802                 }
 803                 break;
 804         case SNDRV_PCM_STREAM_CAPTURE:
 805                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 806                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 807                                 if (SUBSTREAM_BUSY(substream))
 808                                         return -EAGAIN;
 809                         }
 810                 }
 811                 break;
 812         default:
 813                 return -EINVAL;
 814         }
 815
 816         if (file->f_flags & O_APPEND) {
 817                 if (prefer_subdevice < 0) {
 818                         if (pstr->substream_count > 1)
 819                                 return -EINVAL; /* must be unique */
 820                         substream = pstr->substream;
 821                 } else {
 822                         for (substream = pstr->substream; substream;
 823                              substream = substream->next)
 824                                 if (substream->number == prefer_subdevice)
 825                                         break;
 826                 }
 827                 if (! substream)
 828                         return -ENODEV;
 829                 if (! SUBSTREAM_BUSY(substream))
 830                         return -EBADFD;
 831                 substream->ref_count++;
 832                 *rsubstream = substream;
 833                 return 0;
 834         }
 835
 836         if (prefer_subdevice >= 0) {
 837                 for (substream = pstr->substream; substream; substream = substream->next)
 838                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 839                                 goto __ok;
 840         }
 841         for (substream = pstr->substream; substream; substream = substream->next)
 842                 if (!SUBSTREAM_BUSY(substream))
 843                         break;
 844       __ok:
 845         if (substream == NULL)
 846                 return -EAGAIN;
 847
 848         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 849         if (runtime == NULL)
 850                 return -ENOMEM;
 851
 852         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 853         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 854         if (runtime->status == NULL) {
 855                 kfree(runtime);
 856                 return -ENOMEM;
 857         }
 858         memset((void*)runtime->status, 0, size);
 859
 860         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 861         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 862         if (runtime->control == NULL) {
 863                 snd_free_pages((void*)runtime->status,
 864                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 865                 kfree(runtime);
 866                 return -ENOMEM;
 867         }
 868         memset((void*)runtime->control, 0, size);
 869
 870         init_waitqueue_head(&runtime->sleep);
 871
 872         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 873
 874         substream->runtime = runtime;
 875         substream->private_data = pcm->private_data;
 876         substream->ref_count = 1;
 877         substream->f_flags = file->f_flags;
 878         pstr->substream_opened++;
 879         *rsubstream = substream;
 880         return 0;
 881 }
 882
 883 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 884 {
 885         struct snd_pcm_runtime *runtime;
 886
 887         runtime = substream->runtime;
 888         snd_assert(runtime != NULL, return);
 889         if (runtime->private_free != NULL)
 890                 runtime->private_free(runtime);
 891         snd_free_pages((void*)runtime->status,
 892                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 893         snd_free_pages((void*)runtime->control,
 894                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 895         kfree(runtime->hw_constraints.rules);
 896         kfree(runtime);
 897         substream->runtime = NULL;
 898         substream->pstr->substream_opened--;
 899 }
 900
 901 static ssize_t show_pcm_class(struct device *dev,
 902                               struct device_attribute *attr, char *buf)
 903 {
 904         struct snd_pcm *pcm;
 905         const char *str;
 906         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
 907                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
 908                 [SNDRV_PCM_CLASS_MULTI] = "multi",
 909                 [SNDRV_PCM_CLASS_MODEM] = "modem",
 910                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
 911         };
 912
 913         if (! (pcm = dev_get_drvdata(dev)) ||
 914             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
 915                 str = "none";
 916         else
 917                 str = strs[pcm->dev_class];
 918         return snprintf(buf, PAGE_SIZE, "%s\n", str);
 919 }
 920
 921 static struct device_attribute pcm_attrs =
 922         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 923
 924 static int snd_pcm_dev_register(struct snd_device *device)
 925 {
 926         int cidx, err;
 927         struct snd_pcm_substream *substream;
 928         struct snd_pcm_notify *notify;
 929         char str[16];
 930         struct snd_pcm *pcm = device->device_data;
 931         struct device *dev;
 932
 933         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 934         mutex_lock(&register_mutex);
 935         if (snd_pcm_search(pcm->card, pcm->device)) {
 936                 mutex_unlock(&register_mutex);
 937                 return -EBUSY;
 938         }
 939         list_add_tail(&pcm->list, &snd_pcm_devices);
 940         for (cidx = 0; cidx < 2; cidx++) {
 941                 int devtype = -1;
 942                 if (pcm->streams[cidx].substream == NULL)
 943                         continue;
 944                 switch (cidx) {
 945                 case SNDRV_PCM_STREAM_PLAYBACK:
 946                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 947                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 948                         break;
 949                 case SNDRV_PCM_STREAM_CAPTURE:
 950                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 951                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 952                         break;
 953                 }
 954                 /* device pointer to use, pcm->dev takes precedence if
 955                  * it is assigned, otherwise fall back to card's device
 956                  * if possible */
 957                 dev = pcm->dev;
 958                 if (!dev)
 959                         dev = snd_card_get_device_link(pcm->card);
 960                 /* register pcm */
 961                 err = snd_register_device_for_dev(devtype, pcm->card,
 962                                                   pcm->device,
 963                                                   &snd_pcm_f_ops[cidx],
 964                                                   pcm, str, dev);
 965                 if (err < 0) {
 966                         list_del(&pcm->list);
 967                         mutex_unlock(&register_mutex);
 968                         return err;
 969                 }
 970                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
 971                                           &pcm_attrs);
 972                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 973                         snd_pcm_timer_init(substream);
 974         }
 975
 976         list_for_each_entry(notify, &snd_pcm_notify_list, list)
 977                 notify->n_register(pcm);
 978
 979         mutex_unlock(&register_mutex);
 980         return 0;
 981 }
 982
 983 static int snd_pcm_dev_disconnect(struct snd_device *device)
 984 {
 985         struct snd_pcm *pcm = device->device_data;
 986         struct snd_pcm_notify *notify;
 987         struct snd_pcm_substream *substream;
 988         int cidx, devtype;
 989
 990         mutex_lock(&register_mutex);
 991         if (list_empty(&pcm->list))
 992                 goto unlock;
 993
 994         list_del_init(&pcm->list);
 995         for (cidx = 0; cidx < 2; cidx++)
 996                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 997                         if (substream->runtime)
 998                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 999         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1000                 notify->n_disconnect(pcm);
1001         }
1002         for (cidx = 0; cidx < 2; cidx++) {
1003                 devtype = -1;
1004                 switch (cidx) {
1005                 case SNDRV_PCM_STREAM_PLAYBACK:
1006                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1007                         break;
1008                 case SNDRV_PCM_STREAM_CAPTURE:
1009                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1010                         break;
1011                 }
1012                 snd_unregister_device(devtype, pcm->card, pcm->device);
1013         }
1014  unlock:
1015         mutex_unlock(&register_mutex);
1016         return 0;
1017 }
1018
1019 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1020 {
1021         struct snd_pcm *pcm;
1022
1023         snd_assert(notify != NULL &&
1024                    notify->n_register != NULL &&
1025                    notify->n_unregister != NULL &&
1026                    notify->n_disconnect, return -EINVAL);
1027         mutex_lock(&register_mutex);
1028         if (nfree) {
1029                 list_del(&notify->list);
1030                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1031                         notify->n_unregister(pcm);
1032         } else {
1033                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1034                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1035                         notify->n_register(pcm);
1036         }
1037         mutex_unlock(&register_mutex);
1038         return 0;
1039 }
1040
1041 EXPORT_SYMBOL(snd_pcm_notify);
1042
1043 #ifdef CONFIG_PROC_FS
1044 /*
1045  *  Info interface
1046  */
1047
1048 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1049                               struct snd_info_buffer *buffer)
1050 {
1051         struct snd_pcm *pcm;
1052
1053         mutex_lock(&register_mutex);
1054         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1055                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1056                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1057                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1058                         snd_iprintf(buffer, " : playback %i",
1059                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1060                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1061                         snd_iprintf(buffer, " : capture %i",
1062                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1063                 snd_iprintf(buffer, "\n");
1064         }
1065         mutex_unlock(&register_mutex);
1066 }
1067
1068 static struct snd_info_entry *snd_pcm_proc_entry;
1069
1070 static void snd_pcm_proc_init(void)
1071 {
1072         struct snd_info_entry *entry;
1073
1074         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1075                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1076                 if (snd_info_register(entry) < 0) {
1077                         snd_info_free_entry(entry);
1078                         entry = NULL;
1079                 }
1080         }
1081         snd_pcm_proc_entry = entry;
1082 }
1083
1084 static void snd_pcm_proc_done(void)
1085 {
1086         snd_info_free_entry(snd_pcm_proc_entry);
1087 }
1088
1089 #else /* !CONFIG_PROC_FS */
1090 #define snd_pcm_proc_init()
1091 #define snd_pcm_proc_done()
1092 #endif /* CONFIG_PROC_FS */
1093
1094
1095 /*
1096  *  ENTRY functions
1097  */
1098
1099 static int __init alsa_pcm_init(void)
1100 {
1101         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1102         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1103         snd_pcm_proc_init();
1104         return 0;
1105 }
1106
1107 static void __exit alsa_pcm_exit(void)
1108 {
1109         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1110         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1111         snd_pcm_proc_done();
1112 }
1113
1114 module_init(alsa_pcm_init)
1115 module_exit(alsa_pcm_exit)