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         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 363 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 364         if (substream->oss.oss) {
 365                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 366                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 367                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 368                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 369                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 370                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 371         }
 372 #endif
 373 }
 374
 375 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
 376                                                   struct snd_info_buffer *buffer)
 377 {
 378         struct snd_pcm_substream *substream = entry->private_data;
 379         struct snd_pcm_runtime *runtime = substream->runtime;
 380         if (!runtime) {
 381                 snd_iprintf(buffer, "closed\n");
 382                 return;
 383         }
 384         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 385                 snd_iprintf(buffer, "no setup\n");
 386                 return;
 387         }
 388         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 389         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 390         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 391         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 392         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 393         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 394         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 395         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 396         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 397 }
 398
 399 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 400                                                struct snd_info_buffer *buffer)
 401 {
 402         struct snd_pcm_substream *substream = entry->private_data;
 403         struct snd_pcm_runtime *runtime = substream->runtime;
 404         struct snd_pcm_status status;
 405         int err;
 406         if (!runtime) {
 407                 snd_iprintf(buffer, "closed\n");
 408                 return;
 409         }
 410         memset(&status, 0, sizeof(status));
 411         err = snd_pcm_status(substream, &status);
 412         if (err < 0) {
 413                 snd_iprintf(buffer, "error %d\n", err);
 414                 return;
 415         }
 416         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 417         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 418                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 419         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 420                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 421         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 422         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 423         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 424         snd_iprintf(buffer, "-----\n");
 425         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 426         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 427 }
 428
 429 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 430 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 431                                     struct snd_info_buffer *buffer)
 432 {
 433         struct snd_pcm_str *pstr = entry->private_data;
 434         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 435 }
 436
 437 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 438                                      struct snd_info_buffer *buffer)
 439 {
 440         struct snd_pcm_str *pstr = entry->private_data;
 441         char line[64];
 442         if (!snd_info_get_line(buffer, line, sizeof(line)))
 443                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 444 }
 445 #endif
 446
 447 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 448 {
 449         struct snd_pcm *pcm = pstr->pcm;
 450         struct snd_info_entry *entry;
 451         char name[16];
 452
 453         sprintf(name, "pcm%i%c", pcm->device,
 454                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 455         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 456                 return -ENOMEM;
 457         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 458         if (snd_info_register(entry) < 0) {
 459                 snd_info_free_entry(entry);
 460                 return -ENOMEM;
 461         }
 462         pstr->proc_root = entry;
 463
 464         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 465                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 466                 if (snd_info_register(entry) < 0) {
 467                         snd_info_free_entry(entry);
 468                         entry = NULL;
 469                 }
 470         }
 471         pstr->proc_info_entry = entry;
 472
 473 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 474         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 475                                                 pstr->proc_root)) != NULL) {
 476                 entry->c.text.read = snd_pcm_xrun_debug_read;
 477                 entry->c.text.write = snd_pcm_xrun_debug_write;
 478                 entry->mode |= S_IWUSR;
 479                 entry->private_data = pstr;
 480                 if (snd_info_register(entry) < 0) {
 481                         snd_info_free_entry(entry);
 482                         entry = NULL;
 483                 }
 484         }
 485         pstr->proc_xrun_debug_entry = entry;
 486 #endif
 487         return 0;
 488 }
 489
 490 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 491 {
 492 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 493         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 494         pstr->proc_xrun_debug_entry = NULL;
 495 #endif
 496         snd_info_free_entry(pstr->proc_info_entry);
 497         pstr->proc_info_entry = NULL;
 498         snd_info_free_entry(pstr->proc_root);
 499         pstr->proc_root = NULL;
 500         return 0;
 501 }
 502
 503 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 504 {
 505         struct snd_info_entry *entry;
 506         struct snd_card *card;
 507         char name[16];
 508
 509         card = substream->pcm->card;
 510
 511         sprintf(name, "sub%i", substream->number);
 512         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 513                 return -ENOMEM;
 514         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 515         if (snd_info_register(entry) < 0) {
 516                 snd_info_free_entry(entry);
 517                 return -ENOMEM;
 518         }
 519         substream->proc_root = entry;
 520
 521         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 522                 snd_info_set_text_ops(entry, substream,
 523                                       snd_pcm_substream_proc_info_read);
 524                 if (snd_info_register(entry) < 0) {
 525                         snd_info_free_entry(entry);
 526                         entry = NULL;
 527                 }
 528         }
 529         substream->proc_info_entry = entry;
 530
 531         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 532                 snd_info_set_text_ops(entry, substream,
 533                                       snd_pcm_substream_proc_hw_params_read);
 534                 if (snd_info_register(entry) < 0) {
 535                         snd_info_free_entry(entry);
 536                         entry = NULL;
 537                 }
 538         }
 539         substream->proc_hw_params_entry = entry;
 540
 541         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 542                 snd_info_set_text_ops(entry, substream,
 543                                       snd_pcm_substream_proc_sw_params_read);
 544                 if (snd_info_register(entry) < 0) {
 545                         snd_info_free_entry(entry);
 546                         entry = NULL;
 547                 }
 548         }
 549         substream->proc_sw_params_entry = entry;
 550
 551         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 552                 snd_info_set_text_ops(entry, substream,
 553                                       snd_pcm_substream_proc_status_read);
 554                 if (snd_info_register(entry) < 0) {
 555                         snd_info_free_entry(entry);
 556                         entry = NULL;
 557                 }
 558         }
 559         substream->proc_status_entry = entry;
 560
 561         return 0;
 562 }
 563
 564 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 565 {
 566         snd_info_free_entry(substream->proc_info_entry);
 567         substream->proc_info_entry = NULL;
 568         snd_info_free_entry(substream->proc_hw_params_entry);
 569         substream->proc_hw_params_entry = NULL;
 570         snd_info_free_entry(substream->proc_sw_params_entry);
 571         substream->proc_sw_params_entry = NULL;
 572         snd_info_free_entry(substream->proc_status_entry);
 573         substream->proc_status_entry = NULL;
 574         snd_info_free_entry(substream->proc_root);
 575         substream->proc_root = NULL;
 576         return 0;
 577 }
 578 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 579 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 580 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 581 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 582 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 583 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 584
 585 /**
 586  * snd_pcm_new_stream - create a new PCM stream
 587  * @pcm: the pcm instance
 588  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 589  * @substream_count: the number of substreams
 590  *
 591  * Creates a new stream for the pcm.
 592  * The corresponding stream on the pcm must have been empty before
 593  * calling this, i.e. zero must be given to the argument of
 594  * snd_pcm_new().
 595  *
 596  * Returns zero if successful, or a negative error code on failure.
 597  */
 598 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 599 {
 600         int idx, err;
 601         struct snd_pcm_str *pstr = &pcm->streams[stream];
 602         struct snd_pcm_substream *substream, *prev;
 603
 604 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 605         mutex_init(&pstr->oss.setup_mutex);
 606 #endif
 607         pstr->stream = stream;
 608         pstr->pcm = pcm;
 609         pstr->substream_count = substream_count;
 610         if (substream_count > 0) {
 611                 err = snd_pcm_stream_proc_init(pstr);
 612                 if (err < 0) {
 613                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 614                         return err;
 615                 }
 616         }
 617         prev = NULL;
 618         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 619                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 620                 if (substream == NULL) {
 621                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 622                         return -ENOMEM;
 623                 }
 624                 substream->pcm = pcm;
 625                 substream->pstr = pstr;
 626                 substream->number = idx;
 627                 substream->stream = stream;
 628                 sprintf(substream->name, "subdevice #%i", idx);
 629                 snprintf(substream->latency_id, sizeof(substream->latency_id),
 630                          "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
 631                          (stream ? 'c' : 'p'), idx);
 632                 substream->buffer_bytes_max = UINT_MAX;
 633                 if (prev == NULL)
 634                         pstr->substream = substream;
 635                 else
 636                         prev->next = substream;
 637                 err = snd_pcm_substream_proc_init(substream);
 638                 if (err < 0) {
 639                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 640                         if (prev == NULL)
 641                                 pstr->substream = NULL;
 642                         else
 643                                 prev->next = NULL;
 644                         kfree(substream);
 645                         return err;
 646                 }
 647                 substream->group = &substream->self_group;
 648                 spin_lock_init(&substream->self_group.lock);
 649                 INIT_LIST_HEAD(&substream->self_group.substreams);
 650                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 651                 spin_lock_init(&substream->timer_lock);
 652                 atomic_set(&substream->mmap_count, 0);
 653                 prev = substream;
 654         }
 655         return 0;
 656 }
 657
 658 EXPORT_SYMBOL(snd_pcm_new_stream);
 659
 660 /**
 661  * snd_pcm_new - create a new PCM instance
 662  * @card: the card instance
 663  * @id: the id string
 664  * @device: the device index (zero based)
 665  * @playback_count: the number of substreams for playback
 666  * @capture_count: the number of substreams for capture
 667  * @rpcm: the pointer to store the new pcm instance
 668  *
 669  * Creates a new PCM instance.
 670  *
 671  * The pcm operators have to be set afterwards to the new instance
 672  * via snd_pcm_set_ops().
 673  *
 674  * Returns zero if successful, or a negative error code on failure.
 675  */
 676 int snd_pcm_new(struct snd_card *card, char *id, int device,
 677                 int playback_count, int capture_count,
 678                 struct snd_pcm ** rpcm)
 679 {
 680         struct snd_pcm *pcm;
 681         int err;
 682         static struct snd_device_ops ops = {
 683                 .dev_free = snd_pcm_dev_free,
 684                 .dev_register = snd_pcm_dev_register,
 685                 .dev_disconnect = snd_pcm_dev_disconnect,
 686         };
 687
 688         snd_assert(rpcm != NULL, return -EINVAL);
 689         *rpcm = NULL;
 690         snd_assert(card != NULL, return -ENXIO);
 691         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 692         if (pcm == NULL) {
 693                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 694                 return -ENOMEM;
 695         }
 696         pcm->card = card;
 697         pcm->device = device;
 698         if (id)
 699                 strlcpy(pcm->id, id, sizeof(pcm->id));
 700         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 701                 snd_pcm_free(pcm);
 702                 return err;
 703         }
 704         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 705                 snd_pcm_free(pcm);
 706                 return err;
 707         }
 708         mutex_init(&pcm->open_mutex);
 709         init_waitqueue_head(&pcm->open_wait);
 710         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 711                 snd_pcm_free(pcm);
 712                 return err;
 713         }
 714         *rpcm = pcm;
 715         return 0;
 716 }
 717
 718 EXPORT_SYMBOL(snd_pcm_new);
 719
 720 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 721 {
 722         struct snd_pcm_substream *substream, *substream_next;
 723 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 724         struct snd_pcm_oss_setup *setup, *setupn;
 725 #endif
 726         substream = pstr->substream;
 727         while (substream) {
 728                 substream_next = substream->next;
 729                 snd_pcm_timer_done(substream);
 730                 snd_pcm_substream_proc_done(substream);
 731                 kfree(substream);
 732                 substream = substream_next;
 733         }
 734         snd_pcm_stream_proc_done(pstr);
 735 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 736         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 737                 setupn = setup->next;
 738                 kfree(setup->task_name);
 739                 kfree(setup);
 740         }
 741 #endif
 742 }
 743
 744 static int snd_pcm_free(struct snd_pcm *pcm)
 745 {
 746         struct snd_pcm_notify *notify;
 747
 748         snd_assert(pcm != NULL, return -ENXIO);
 749         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 750                 notify->n_unregister(pcm);
 751         }
 752         if (pcm->private_free)
 753                 pcm->private_free(pcm);
 754         snd_pcm_lib_preallocate_free_for_all(pcm);
 755         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 756         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 757         kfree(pcm);
 758         return 0;
 759 }
 760
 761 static int snd_pcm_dev_free(struct snd_device *device)
 762 {
 763         struct snd_pcm *pcm = device->device_data;
 764         return snd_pcm_free(pcm);
 765 }
 766
 767 static void snd_pcm_tick_timer_func(unsigned long data)
 768 {
 769         struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
 770         snd_pcm_tick_elapsed(substream);
 771 }
 772
 773 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 774                              struct file *file,
 775                              struct snd_pcm_substream **rsubstream)
 776 {
 777         struct snd_pcm_str * pstr;
 778         struct snd_pcm_substream *substream;
 779         struct snd_pcm_runtime *runtime;
 780         struct snd_ctl_file *kctl;
 781         struct snd_card *card;
 782         int prefer_subdevice = -1;
 783         size_t size;
 784
 785         snd_assert(rsubstream != NULL, return -EINVAL);
 786         *rsubstream = NULL;
 787         snd_assert(pcm != NULL, return -ENXIO);
 788         pstr = &pcm->streams[stream];
 789         if (pstr->substream == NULL || pstr->substream_count == 0)
 790                 return -ENODEV;
 791
 792         card = pcm->card;
 793         down_read(&card->controls_rwsem);
 794         list_for_each_entry(kctl, &card->ctl_files, list) {
 795                 if (kctl->pid == current->pid) {
 796                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 797                         if (prefer_subdevice != -1)
 798                                 break;
 799                 }
 800         }
 801         up_read(&card->controls_rwsem);
 802
 803         switch (stream) {
 804         case SNDRV_PCM_STREAM_PLAYBACK:
 805                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 806                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 807                                 if (SUBSTREAM_BUSY(substream))
 808                                         return -EAGAIN;
 809                         }
 810                 }
 811                 break;
 812         case SNDRV_PCM_STREAM_CAPTURE:
 813                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 814                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 815                                 if (SUBSTREAM_BUSY(substream))
 816                                         return -EAGAIN;
 817                         }
 818                 }
 819                 break;
 820         default:
 821                 return -EINVAL;
 822         }
 823
 824         if (file->f_flags & O_APPEND) {
 825                 if (prefer_subdevice < 0) {
 826                         if (pstr->substream_count > 1)
 827                                 return -EINVAL; /* must be unique */
 828                         substream = pstr->substream;
 829                 } else {
 830                         for (substream = pstr->substream; substream;
 831                              substream = substream->next)
 832                                 if (substream->number == prefer_subdevice)
 833                                         break;
 834                 }
 835                 if (! substream)
 836                         return -ENODEV;
 837                 if (! SUBSTREAM_BUSY(substream))
 838                         return -EBADFD;
 839                 substream->ref_count++;
 840                 *rsubstream = substream;
 841                 return 0;
 842         }
 843
 844         if (prefer_subdevice >= 0) {
 845                 for (substream = pstr->substream; substream; substream = substream->next)
 846                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 847                                 goto __ok;
 848         }
 849         for (substream = pstr->substream; substream; substream = substream->next)
 850                 if (!SUBSTREAM_BUSY(substream))
 851                         break;
 852       __ok:
 853         if (substream == NULL)
 854                 return -EAGAIN;
 855
 856         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 857         if (runtime == NULL)
 858                 return -ENOMEM;
 859
 860         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 861         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 862         if (runtime->status == NULL) {
 863                 kfree(runtime);
 864                 return -ENOMEM;
 865         }
 866         memset((void*)runtime->status, 0, size);
 867
 868         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 869         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 870         if (runtime->control == NULL) {
 871                 snd_free_pages((void*)runtime->status,
 872                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 873                 kfree(runtime);
 874                 return -ENOMEM;
 875         }
 876         memset((void*)runtime->control, 0, size);
 877
 878         init_waitqueue_head(&runtime->sleep);
 879         init_timer(&runtime->tick_timer);
 880         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 881         runtime->tick_timer.data = (unsigned long) substream;
 882
 883         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 884
 885         substream->runtime = runtime;
 886         substream->private_data = pcm->private_data;
 887         substream->ref_count = 1;
 888         substream->f_flags = file->f_flags;
 889         pstr->substream_opened++;
 890         *rsubstream = substream;
 891         return 0;
 892 }
 893
 894 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 895 {
 896         struct snd_pcm_runtime *runtime;
 897
 898         runtime = substream->runtime;
 899         snd_assert(runtime != NULL, return);
 900         if (runtime->private_free != NULL)
 901                 runtime->private_free(runtime);
 902         snd_free_pages((void*)runtime->status,
 903                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 904         snd_free_pages((void*)runtime->control,
 905                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 906         kfree(runtime->hw_constraints.rules);
 907         kfree(runtime);
 908         substream->runtime = NULL;
 909         substream->pstr->substream_opened--;
 910 }
 911
 912 static ssize_t show_pcm_class(struct device *dev,
 913                               struct device_attribute *attr, char *buf)
 914 {
 915         struct snd_pcm *pcm;
 916         const char *str;
 917         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
 918                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
 919                 [SNDRV_PCM_CLASS_MULTI] = "multi",
 920                 [SNDRV_PCM_CLASS_MODEM] = "modem",
 921                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
 922         };
 923
 924         if (! (pcm = dev_get_drvdata(dev)) ||
 925             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
 926                 str = "none";
 927         else
 928                 str = strs[pcm->dev_class];
 929         return snprintf(buf, PAGE_SIZE, "%s\n", str);
 930 }
 931
 932 static struct device_attribute pcm_attrs =
 933         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 934
 935 static int snd_pcm_dev_register(struct snd_device *device)
 936 {
 937         int cidx, err;
 938         struct snd_pcm_substream *substream;
 939         struct snd_pcm_notify *notify;
 940         char str[16];
 941         struct snd_pcm *pcm = device->device_data;
 942         struct device *dev;
 943
 944         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 945         mutex_lock(&register_mutex);
 946         if (snd_pcm_search(pcm->card, pcm->device)) {
 947                 mutex_unlock(&register_mutex);
 948                 return -EBUSY;
 949         }
 950         list_add_tail(&pcm->list, &snd_pcm_devices);
 951         for (cidx = 0; cidx < 2; cidx++) {
 952                 int devtype = -1;
 953                 if (pcm->streams[cidx].substream == NULL)
 954                         continue;
 955                 switch (cidx) {
 956                 case SNDRV_PCM_STREAM_PLAYBACK:
 957                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 958                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 959                         break;
 960                 case SNDRV_PCM_STREAM_CAPTURE:
 961                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 962                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 963                         break;
 964                 }
 965                 /* device pointer to use, pcm->dev takes precedence if
 966                  * it is assigned, otherwise fall back to card's device
 967                  * if possible */
 968                 dev = pcm->dev;
 969                 if (!dev)
 970                         dev = snd_card_get_device_link(pcm->card);
 971                 /* register pcm */
 972                 err = snd_register_device_for_dev(devtype, pcm->card,
 973                                                   pcm->device,
 974                                                   &snd_pcm_f_ops[cidx],
 975                                                   pcm, str, dev);
 976                 if (err < 0) {
 977                         list_del(&pcm->list);
 978                         mutex_unlock(&register_mutex);
 979                         return err;
 980                 }
 981                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
 982                                           &pcm_attrs);
 983                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 984                         snd_pcm_timer_init(substream);
 985         }
 986
 987         list_for_each_entry(notify, &snd_pcm_notify_list, list)
 988                 notify->n_register(pcm);
 989
 990         mutex_unlock(&register_mutex);
 991         return 0;
 992 }
 993
 994 static int snd_pcm_dev_disconnect(struct snd_device *device)
 995 {
 996         struct snd_pcm *pcm = device->device_data;
 997         struct snd_pcm_notify *notify;
 998         struct snd_pcm_substream *substream;
 999         int cidx, devtype;
1000
1001         mutex_lock(&register_mutex);
1002         if (list_empty(&pcm->list))
1003                 goto unlock;
1004
1005         list_del_init(&pcm->list);
1006         for (cidx = 0; cidx < 2; cidx++)
1007                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1008                         if (substream->runtime)
1009                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1010         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1011                 notify->n_disconnect(pcm);
1012         }
1013         for (cidx = 0; cidx < 2; cidx++) {
1014                 devtype = -1;
1015                 switch (cidx) {
1016                 case SNDRV_PCM_STREAM_PLAYBACK:
1017                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1018                         break;
1019                 case SNDRV_PCM_STREAM_CAPTURE:
1020                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1021                         break;
1022                 }
1023                 snd_unregister_device(devtype, pcm->card, pcm->device);
1024         }
1025  unlock:
1026         mutex_unlock(&register_mutex);
1027         return 0;
1028 }
1029
1030 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1031 {
1032         struct snd_pcm *pcm;
1033
1034         snd_assert(notify != NULL &&
1035                    notify->n_register != NULL &&
1036                    notify->n_unregister != NULL &&
1037                    notify->n_disconnect, return -EINVAL);
1038         mutex_lock(&register_mutex);
1039         if (nfree) {
1040                 list_del(&notify->list);
1041                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1042                         notify->n_unregister(pcm);
1043         } else {
1044                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1045                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1046                         notify->n_register(pcm);
1047         }
1048         mutex_unlock(&register_mutex);
1049         return 0;
1050 }
1051
1052 EXPORT_SYMBOL(snd_pcm_notify);
1053
1054 #ifdef CONFIG_PROC_FS
1055 /*
1056  *  Info interface
1057  */
1058
1059 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1060                               struct snd_info_buffer *buffer)
1061 {
1062         struct snd_pcm *pcm;
1063
1064         mutex_lock(&register_mutex);
1065         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1066                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1067                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1068                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1069                         snd_iprintf(buffer, " : playback %i",
1070                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1071                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1072                         snd_iprintf(buffer, " : capture %i",
1073                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1074                 snd_iprintf(buffer, "\n");
1075         }
1076         mutex_unlock(&register_mutex);
1077 }
1078
1079 static struct snd_info_entry *snd_pcm_proc_entry;
1080
1081 static void snd_pcm_proc_init(void)
1082 {
1083         struct snd_info_entry *entry;
1084
1085         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1086                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1087                 if (snd_info_register(entry) < 0) {
1088                         snd_info_free_entry(entry);
1089                         entry = NULL;
1090                 }
1091         }
1092         snd_pcm_proc_entry = entry;
1093 }
1094
1095 static void snd_pcm_proc_done(void)
1096 {
1097         snd_info_free_entry(snd_pcm_proc_entry);
1098 }
1099
1100 #else /* !CONFIG_PROC_FS */
1101 #define snd_pcm_proc_init()
1102 #define snd_pcm_proc_done()
1103 #endif /* CONFIG_PROC_FS */
1104
1105
1106 /*
1107  *  ENTRY functions
1108  */
1109
1110 static int __init alsa_pcm_init(void)
1111 {
1112         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1113         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1114         snd_pcm_proc_init();
1115         return 0;
1116 }
1117
1118 static void __exit alsa_pcm_exit(void)
1119 {
1120         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1121         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1122         snd_pcm_proc_done();
1123 }
1124
1125 module_init(alsa_pcm_init)
1126 module_exit(alsa_pcm_exit)