sound/core/pcm.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <linux/time.h>
  25 #include <linux/mutex.h>
  26 #include <sound/core.h>
  27 #include <sound/minors.h>
  28 #include <sound/pcm.h>
  29 #include <sound/control.h>
  30 #include <sound/info.h>
  31
  32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  34 MODULE_LICENSE("GPL");
  35
  36 static LIST_HEAD(snd_pcm_devices);
  37 static LIST_HEAD(snd_pcm_notify_list);
  38 static DEFINE_MUTEX(register_mutex);
  39
  40 static int snd_pcm_free(struct snd_pcm *pcm);
  41 static int snd_pcm_dev_free(struct snd_device *device);
  42 static int snd_pcm_dev_register(struct snd_device *device);
  43 static int snd_pcm_dev_disconnect(struct snd_device *device);
  44
  45 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
  46 {
  47         struct snd_pcm *pcm;
  48
  49         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  50                 if (pcm->card == card && pcm->device == device)
  51                         return pcm;
  52         }
  53         return NULL;
  54 }
  55
  56 static int snd_pcm_next(struct snd_card *card, int device)
  57 {
  58         struct snd_pcm *pcm;
  59
  60         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  61                 if (pcm->card == card && pcm->device > device)
  62                         return pcm->device;
  63                 else if (pcm->card->number > card->number)
  64                         return -1;
  65         }
  66         return -1;
  67 }
  68
  69 static int snd_pcm_add(struct snd_pcm *newpcm)
  70 {
  71         struct snd_pcm *pcm;
  72
  73         list_for_each_entry(pcm, &snd_pcm_devices, list) {
  74                 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
  75                         return -EBUSY;
  76                 if (pcm->card->number > newpcm->card->number ||
  77                                 (pcm->card == newpcm->card &&
  78                                 pcm->device > newpcm->device)) {
  79                         list_add(&newpcm->list, pcm->list.prev);
  80                         return 0;
  81                 }
  82         }
  83         list_add_tail(&newpcm->list, &snd_pcm_devices);
  84         return 0;
  85 }
  86
  87 static int snd_pcm_control_ioctl(struct snd_card *card,
  88                                  struct snd_ctl_file *control,
  89                                  unsigned int cmd, unsigned long arg)
  90 {
  91         switch (cmd) {
  92         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  93                 {
  94                         int device;
  95
  96                         if (get_user(device, (int __user *)arg))
  97                                 return -EFAULT;
  98                         mutex_lock(&register_mutex);
  99                         device = snd_pcm_next(card, device);
 100                         mutex_unlock(&register_mutex);
 101                         if (put_user(device, (int __user *)arg))
 102                                 return -EFAULT;
 103                         return 0;
 104                 }
 105         case SNDRV_CTL_IOCTL_PCM_INFO:
 106                 {
 107                         struct snd_pcm_info __user *info;
 108                         unsigned int device, subdevice;
 109                         int stream;
 110                         struct snd_pcm *pcm;
 111                         struct snd_pcm_str *pstr;
 112                         struct snd_pcm_substream *substream;
 113                         int err;
 114
 115                         info = (struct snd_pcm_info __user *)arg;
 116                         if (get_user(device, &info->device))
 117                                 return -EFAULT;
 118                         if (get_user(stream, &info->stream))
 119                                 return -EFAULT;
 120                         if (stream < 0 || stream > 1)
 121                                 return -EINVAL;
 122                         if (get_user(subdevice, &info->subdevice))
 123                                 return -EFAULT;
 124                         mutex_lock(&register_mutex);
 125                         pcm = snd_pcm_get(card, device);
 126                         if (pcm == NULL) {
 127                                 err = -ENXIO;
 128                                 goto _error;
 129                         }
 130                         pstr = &pcm->streams[stream];
 131                         if (pstr->substream_count == 0) {
 132                                 err = -ENOENT;
 133                                 goto _error;
 134                         }
 135                         if (subdevice >= pstr->substream_count) {
 136                                 err = -ENXIO;
 137                                 goto _error;
 138                         }
 139                         for (substream = pstr->substream; substream;
 140                              substream = substream->next)
 141                                 if (substream->number == (int)subdevice)
 142                                         break;
 143                         if (substream == NULL) {
 144                                 err = -ENXIO;
 145                                 goto _error;
 146                         }
 147                         err = snd_pcm_info_user(substream, info);
 148                 _error:
 149                         mutex_unlock(&register_mutex);
 150                         return err;
 151                 }
 152         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 153                 {
 154                         int val;
 155
 156                         if (get_user(val, (int __user *)arg))
 157                                 return -EFAULT;
 158                         control->prefer_pcm_subdevice = val;
 159                         return 0;
 160                 }
 161         }
 162         return -ENOIOCTLCMD;
 163 }
 164
 165 #ifdef CONFIG_SND_VERBOSE_PROCFS
 166
 167 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 168 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 169 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 170 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 171 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 172 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 173 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 174 #define START(v) [SNDRV_PCM_START_##v] = #v
 175 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 176 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 177
 178 static char *snd_pcm_format_names[] = {
 179         FORMAT(S8),
 180         FORMAT(U8),
 181         FORMAT(S16_LE),
 182         FORMAT(S16_BE),
 183         FORMAT(U16_LE),
 184         FORMAT(U16_BE),
 185         FORMAT(S24_LE),
 186         FORMAT(S24_BE),
 187         FORMAT(U24_LE),
 188         FORMAT(U24_BE),
 189         FORMAT(S32_LE),
 190         FORMAT(S32_BE),
 191         FORMAT(U32_LE),
 192         FORMAT(U32_BE),
 193         FORMAT(FLOAT_LE),
 194         FORMAT(FLOAT_BE),
 195         FORMAT(FLOAT64_LE),
 196         FORMAT(FLOAT64_BE),
 197         FORMAT(IEC958_SUBFRAME_LE),
 198         FORMAT(IEC958_SUBFRAME_BE),
 199         FORMAT(MU_LAW),
 200         FORMAT(A_LAW),
 201         FORMAT(IMA_ADPCM),
 202         FORMAT(MPEG),
 203         FORMAT(GSM),
 204         FORMAT(SPECIAL),
 205         FORMAT(S24_3LE),
 206         FORMAT(S24_3BE),
 207         FORMAT(U24_3LE),
 208         FORMAT(U24_3BE),
 209         FORMAT(S20_3LE),
 210         FORMAT(S20_3BE),
 211         FORMAT(U20_3LE),
 212         FORMAT(U20_3BE),
 213         FORMAT(S18_3LE),
 214         FORMAT(S18_3BE),
 215         FORMAT(U18_3LE),
 216         FORMAT(U18_3BE),
 217 };
 218
 219 static const char *snd_pcm_format_name(snd_pcm_format_t format)
 220 {
 221         return snd_pcm_format_names[format];
 222 }
 223
 224 static char *snd_pcm_stream_names[] = {
 225         STREAM(PLAYBACK),
 226         STREAM(CAPTURE),
 227 };
 228
 229 static char *snd_pcm_state_names[] = {
 230         STATE(OPEN),
 231         STATE(SETUP),
 232         STATE(PREPARED),
 233         STATE(RUNNING),
 234         STATE(XRUN),
 235         STATE(DRAINING),
 236         STATE(PAUSED),
 237         STATE(SUSPENDED),
 238 };
 239
 240 static char *snd_pcm_access_names[] = {
 241         ACCESS(MMAP_INTERLEAVED),
 242         ACCESS(MMAP_NONINTERLEAVED),
 243         ACCESS(MMAP_COMPLEX),
 244         ACCESS(RW_INTERLEAVED),
 245         ACCESS(RW_NONINTERLEAVED),
 246 };
 247
 248 static char *snd_pcm_subformat_names[] = {
 249         SUBFORMAT(STD),
 250 };
 251
 252 static char *snd_pcm_tstamp_mode_names[] = {
 253         TSTAMP(NONE),
 254         TSTAMP(ENABLE),
 255 };
 256
 257 static const char *snd_pcm_stream_name(int stream)
 258 {
 259         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 260         return snd_pcm_stream_names[stream];
 261 }
 262
 263 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 264 {
 265         return snd_pcm_access_names[access];
 266 }
 267
 268 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 269 {
 270         return snd_pcm_subformat_names[subformat];
 271 }
 272
 273 static const char *snd_pcm_tstamp_mode_name(int mode)
 274 {
 275         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 276         return snd_pcm_tstamp_mode_names[mode];
 277 }
 278
 279 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 280 {
 281         return snd_pcm_state_names[state];
 282 }
 283
 284 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 285 #include <linux/soundcard.h>
 286
 287 static const char *snd_pcm_oss_format_name(int format)
 288 {
 289         switch (format) {
 290         case AFMT_MU_LAW:
 291                 return "MU_LAW";
 292         case AFMT_A_LAW:
 293                 return "A_LAW";
 294         case AFMT_IMA_ADPCM:
 295                 return "IMA_ADPCM";
 296         case AFMT_U8:
 297                 return "U8";
 298         case AFMT_S16_LE:
 299                 return "S16_LE";
 300         case AFMT_S16_BE:
 301                 return "S16_BE";
 302         case AFMT_S8:
 303                 return "S8";
 304         case AFMT_U16_LE:
 305                 return "U16_LE";
 306         case AFMT_U16_BE:
 307                 return "U16_BE";
 308         case AFMT_MPEG:
 309                 return "MPEG";
 310         default:
 311                 return "unknown";
 312         }
 313 }
 314 #endif
 315
 316 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
 317                                    struct snd_info_buffer *buffer)
 318 {
 319         struct snd_pcm_info *info;
 320         int err;
 321
 322         if (! substream)
 323                 return;
 324
 325         info = kmalloc(sizeof(*info), GFP_KERNEL);
 326         if (! info) {
 327                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 328                 return;
 329         }
 330
 331         err = snd_pcm_info(substream, info);
 332         if (err < 0) {
 333                 snd_iprintf(buffer, "error %d\n", err);
 334                 kfree(info);
 335                 return;
 336         }
 337         snd_iprintf(buffer, "card: %d\n", info->card);
 338         snd_iprintf(buffer, "device: %d\n", info->device);
 339         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 340         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 341         snd_iprintf(buffer, "id: %s\n", info->id);
 342         snd_iprintf(buffer, "name: %s\n", info->name);
 343         snd_iprintf(buffer, "subname: %s\n", info->subname);
 344         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 345         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 346         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 347         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 348         kfree(info);
 349 }
 350
 351 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
 352                                           struct snd_info_buffer *buffer)
 353 {
 354         snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
 355                                buffer);
 356 }
 357
 358 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
 359                                              struct snd_info_buffer *buffer)
 360 {
 361         snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
 362                                buffer);
 363 }
 364
 365 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
 366                                                   struct snd_info_buffer *buffer)
 367 {
 368         struct snd_pcm_substream *substream = entry->private_data;
 369         struct snd_pcm_runtime *runtime = substream->runtime;
 370         if (!runtime) {
 371                 snd_iprintf(buffer, "closed\n");
 372                 return;
 373         }
 374         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 375                 snd_iprintf(buffer, "no setup\n");
 376                 return;
 377         }
 378         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 379         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 380         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 381         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 382         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 383         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 384         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 385 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 386         if (substream->oss.oss) {
 387                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 388                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 389                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 390                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 391                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 392                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 393         }
 394 #endif
 395 }
 396
 397 static void snd_pcm_substream_proc_sw_params_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         if (!runtime) {
 403                 snd_iprintf(buffer, "closed\n");
 404                 return;
 405         }
 406         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 407                 snd_iprintf(buffer, "no setup\n");
 408                 return;
 409         }
 410         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 411         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 412         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 413         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 414         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 415         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 416         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 417         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 418 }
 419
 420 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
 421                                                struct snd_info_buffer *buffer)
 422 {
 423         struct snd_pcm_substream *substream = entry->private_data;
 424         struct snd_pcm_runtime *runtime = substream->runtime;
 425         struct snd_pcm_status status;
 426         int err;
 427         if (!runtime) {
 428                 snd_iprintf(buffer, "closed\n");
 429                 return;
 430         }
 431         memset(&status, 0, sizeof(status));
 432         err = snd_pcm_status(substream, &status);
 433         if (err < 0) {
 434                 snd_iprintf(buffer, "error %d\n", err);
 435                 return;
 436         }
 437         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 438         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 439                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 440         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 441                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 442         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 443         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 444         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 445         snd_iprintf(buffer, "-----\n");
 446         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 447         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 448 }
 449
 450 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 451 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
 452                                     struct snd_info_buffer *buffer)
 453 {
 454         struct snd_pcm_str *pstr = entry->private_data;
 455         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 456 }
 457
 458 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
 459                                      struct snd_info_buffer *buffer)
 460 {
 461         struct snd_pcm_str *pstr = entry->private_data;
 462         char line[64];
 463         if (!snd_info_get_line(buffer, line, sizeof(line)))
 464                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 465 }
 466 #endif
 467
 468 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
 469 {
 470         struct snd_pcm *pcm = pstr->pcm;
 471         struct snd_info_entry *entry;
 472         char name[16];
 473
 474         sprintf(name, "pcm%i%c", pcm->device,
 475                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 476         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 477                 return -ENOMEM;
 478         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 479         if (snd_info_register(entry) < 0) {
 480                 snd_info_free_entry(entry);
 481                 return -ENOMEM;
 482         }
 483         pstr->proc_root = entry;
 484
 485         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 486                 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
 487                 if (snd_info_register(entry) < 0) {
 488                         snd_info_free_entry(entry);
 489                         entry = NULL;
 490                 }
 491         }
 492         pstr->proc_info_entry = entry;
 493
 494 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 495         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
 496                                                 pstr->proc_root)) != NULL) {
 497                 entry->c.text.read = snd_pcm_xrun_debug_read;
 498                 entry->c.text.write = snd_pcm_xrun_debug_write;
 499                 entry->mode |= S_IWUSR;
 500                 entry->private_data = pstr;
 501                 if (snd_info_register(entry) < 0) {
 502                         snd_info_free_entry(entry);
 503                         entry = NULL;
 504                 }
 505         }
 506         pstr->proc_xrun_debug_entry = entry;
 507 #endif
 508         return 0;
 509 }
 510
 511 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
 512 {
 513 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 514         snd_info_free_entry(pstr->proc_xrun_debug_entry);
 515         pstr->proc_xrun_debug_entry = NULL;
 516 #endif
 517         snd_info_free_entry(pstr->proc_info_entry);
 518         pstr->proc_info_entry = NULL;
 519         snd_info_free_entry(pstr->proc_root);
 520         pstr->proc_root = NULL;
 521         return 0;
 522 }
 523
 524 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
 525 {
 526         struct snd_info_entry *entry;
 527         struct snd_card *card;
 528         char name[16];
 529
 530         card = substream->pcm->card;
 531
 532         sprintf(name, "sub%i", substream->number);
 533         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 534                 return -ENOMEM;
 535         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 536         if (snd_info_register(entry) < 0) {
 537                 snd_info_free_entry(entry);
 538                 return -ENOMEM;
 539         }
 540         substream->proc_root = entry;
 541
 542         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 543                 snd_info_set_text_ops(entry, substream,
 544                                       snd_pcm_substream_proc_info_read);
 545                 if (snd_info_register(entry) < 0) {
 546                         snd_info_free_entry(entry);
 547                         entry = NULL;
 548                 }
 549         }
 550         substream->proc_info_entry = entry;
 551
 552         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 553                 snd_info_set_text_ops(entry, substream,
 554                                       snd_pcm_substream_proc_hw_params_read);
 555                 if (snd_info_register(entry) < 0) {
 556                         snd_info_free_entry(entry);
 557                         entry = NULL;
 558                 }
 559         }
 560         substream->proc_hw_params_entry = entry;
 561
 562         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 563                 snd_info_set_text_ops(entry, substream,
 564                                       snd_pcm_substream_proc_sw_params_read);
 565                 if (snd_info_register(entry) < 0) {
 566                         snd_info_free_entry(entry);
 567                         entry = NULL;
 568                 }
 569         }
 570         substream->proc_sw_params_entry = entry;
 571
 572         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 573                 snd_info_set_text_ops(entry, substream,
 574                                       snd_pcm_substream_proc_status_read);
 575                 if (snd_info_register(entry) < 0) {
 576                         snd_info_free_entry(entry);
 577                         entry = NULL;
 578                 }
 579         }
 580         substream->proc_status_entry = entry;
 581
 582         return 0;
 583 }
 584
 585 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
 586 {
 587         snd_info_free_entry(substream->proc_info_entry);
 588         substream->proc_info_entry = NULL;
 589         snd_info_free_entry(substream->proc_hw_params_entry);
 590         substream->proc_hw_params_entry = NULL;
 591         snd_info_free_entry(substream->proc_sw_params_entry);
 592         substream->proc_sw_params_entry = NULL;
 593         snd_info_free_entry(substream->proc_status_entry);
 594         substream->proc_status_entry = NULL;
 595         snd_info_free_entry(substream->proc_root);
 596         substream->proc_root = NULL;
 597         return 0;
 598 }
 599 #else /* !CONFIG_SND_VERBOSE_PROCFS */
 600 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
 601 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
 602 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
 603 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
 604 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 605
 606 /**
 607  * snd_pcm_new_stream - create a new PCM stream
 608  * @pcm: the pcm instance
 609  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 610  * @substream_count: the number of substreams
 611  *
 612  * Creates a new stream for the pcm.
 613  * The corresponding stream on the pcm must have been empty before
 614  * calling this, i.e. zero must be given to the argument of
 615  * snd_pcm_new().
 616  *
 617  * Returns zero if successful, or a negative error code on failure.
 618  */
 619 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 620 {
 621         int idx, err;
 622         struct snd_pcm_str *pstr = &pcm->streams[stream];
 623         struct snd_pcm_substream *substream, *prev;
 624
 625 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 626         mutex_init(&pstr->oss.setup_mutex);
 627 #endif
 628         pstr->stream = stream;
 629         pstr->pcm = pcm;
 630         pstr->substream_count = substream_count;
 631         if (substream_count > 0) {
 632                 err = snd_pcm_stream_proc_init(pstr);
 633                 if (err < 0) {
 634                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 635                         return err;
 636                 }
 637         }
 638         prev = NULL;
 639         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 640                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
 641                 if (substream == NULL) {
 642                         snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
 643                         return -ENOMEM;
 644                 }
 645                 substream->pcm = pcm;
 646                 substream->pstr = pstr;
 647                 substream->number = idx;
 648                 substream->stream = stream;
 649                 sprintf(substream->name, "subdevice #%i", idx);
 650                 snprintf(substream->latency_id, sizeof(substream->latency_id),
 651                          "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
 652                          (stream ? 'c' : 'p'), idx);
 653                 substream->buffer_bytes_max = UINT_MAX;
 654                 if (prev == NULL)
 655                         pstr->substream = substream;
 656                 else
 657                         prev->next = substream;
 658                 err = snd_pcm_substream_proc_init(substream);
 659                 if (err < 0) {
 660                         snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
 661                         if (prev == NULL)
 662                                 pstr->substream = NULL;
 663                         else
 664                                 prev->next = NULL;
 665                         kfree(substream);
 666                         return err;
 667                 }
 668                 substream->group = &substream->self_group;
 669                 spin_lock_init(&substream->self_group.lock);
 670                 INIT_LIST_HEAD(&substream->self_group.substreams);
 671                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 672                 spin_lock_init(&substream->timer_lock);
 673                 atomic_set(&substream->mmap_count, 0);
 674                 prev = substream;
 675         }
 676         return 0;
 677 }
 678
 679 EXPORT_SYMBOL(snd_pcm_new_stream);
 680
 681 /**
 682  * snd_pcm_new - create a new PCM instance
 683  * @card: the card instance
 684  * @id: the id string
 685  * @device: the device index (zero based)
 686  * @playback_count: the number of substreams for playback
 687  * @capture_count: the number of substreams for capture
 688  * @rpcm: the pointer to store the new pcm instance
 689  *
 690  * Creates a new PCM instance.
 691  *
 692  * The pcm operators have to be set afterwards to the new instance
 693  * via snd_pcm_set_ops().
 694  *
 695  * Returns zero if successful, or a negative error code on failure.
 696  */
 697 int snd_pcm_new(struct snd_card *card, char *id, int device,
 698                 int playback_count, int capture_count,
 699                 struct snd_pcm ** rpcm)
 700 {
 701         struct snd_pcm *pcm;
 702         int err;
 703         static struct snd_device_ops ops = {
 704                 .dev_free = snd_pcm_dev_free,
 705                 .dev_register = snd_pcm_dev_register,
 706                 .dev_disconnect = snd_pcm_dev_disconnect,
 707         };
 708
 709         snd_assert(rpcm != NULL, return -EINVAL);
 710         *rpcm = NULL;
 711         snd_assert(card != NULL, return -ENXIO);
 712         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
 713         if (pcm == NULL) {
 714                 snd_printk(KERN_ERR "Cannot allocate PCM\n");
 715                 return -ENOMEM;
 716         }
 717         pcm->card = card;
 718         pcm->device = device;
 719         if (id)
 720                 strlcpy(pcm->id, id, sizeof(pcm->id));
 721         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 722                 snd_pcm_free(pcm);
 723                 return err;
 724         }
 725         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 726                 snd_pcm_free(pcm);
 727                 return err;
 728         }
 729         mutex_init(&pcm->open_mutex);
 730         init_waitqueue_head(&pcm->open_wait);
 731         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 732                 snd_pcm_free(pcm);
 733                 return err;
 734         }
 735         *rpcm = pcm;
 736         return 0;
 737 }
 738
 739 EXPORT_SYMBOL(snd_pcm_new);
 740
 741 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 742 {
 743         struct snd_pcm_substream *substream, *substream_next;
 744 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 745         struct snd_pcm_oss_setup *setup, *setupn;
 746 #endif
 747         substream = pstr->substream;
 748         while (substream) {
 749                 substream_next = substream->next;
 750                 snd_pcm_timer_done(substream);
 751                 snd_pcm_substream_proc_done(substream);
 752                 kfree(substream);
 753                 substream = substream_next;
 754         }
 755         snd_pcm_stream_proc_done(pstr);
 756 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 757         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 758                 setupn = setup->next;
 759                 kfree(setup->task_name);
 760                 kfree(setup);
 761         }
 762 #endif
 763 }
 764
 765 static int snd_pcm_free(struct snd_pcm *pcm)
 766 {
 767         struct snd_pcm_notify *notify;
 768
 769         snd_assert(pcm != NULL, return -ENXIO);
 770         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
 771                 notify->n_unregister(pcm);
 772         }
 773         if (pcm->private_free)
 774                 pcm->private_free(pcm);
 775         snd_pcm_lib_preallocate_free_for_all(pcm);
 776         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 777         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 778         kfree(pcm);
 779         return 0;
 780 }
 781
 782 static int snd_pcm_dev_free(struct snd_device *device)
 783 {
 784         struct snd_pcm *pcm = device->device_data;
 785         return snd_pcm_free(pcm);
 786 }
 787
 788 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
 789                              struct file *file,
 790                              struct snd_pcm_substream **rsubstream)
 791 {
 792         struct snd_pcm_str * pstr;
 793         struct snd_pcm_substream *substream;
 794         struct snd_pcm_runtime *runtime;
 795         struct snd_ctl_file *kctl;
 796         struct snd_card *card;
 797         int prefer_subdevice = -1;
 798         size_t size;
 799
 800         snd_assert(rsubstream != NULL, return -EINVAL);
 801         *rsubstream = NULL;
 802         snd_assert(pcm != NULL, return -ENXIO);
 803         pstr = &pcm->streams[stream];
 804         if (pstr->substream == NULL || pstr->substream_count == 0)
 805                 return -ENODEV;
 806
 807         card = pcm->card;
 808         read_lock(&card->ctl_files_rwlock);
 809         list_for_each_entry(kctl, &card->ctl_files, list) {
 810                 if (kctl->pid == current->pid) {
 811                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 812                         if (prefer_subdevice != -1)
 813                                 break;
 814                 }
 815         }
 816         read_unlock(&card->ctl_files_rwlock);
 817
 818         switch (stream) {
 819         case SNDRV_PCM_STREAM_PLAYBACK:
 820                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 821                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 822                                 if (SUBSTREAM_BUSY(substream))
 823                                         return -EAGAIN;
 824                         }
 825                 }
 826                 break;
 827         case SNDRV_PCM_STREAM_CAPTURE:
 828                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 829                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 830                                 if (SUBSTREAM_BUSY(substream))
 831                                         return -EAGAIN;
 832                         }
 833                 }
 834                 break;
 835         default:
 836                 return -EINVAL;
 837         }
 838
 839         if (file->f_flags & O_APPEND) {
 840                 if (prefer_subdevice < 0) {
 841                         if (pstr->substream_count > 1)
 842                                 return -EINVAL; /* must be unique */
 843                         substream = pstr->substream;
 844                 } else {
 845                         for (substream = pstr->substream; substream;
 846                              substream = substream->next)
 847                                 if (substream->number == prefer_subdevice)
 848                                         break;
 849                 }
 850                 if (! substream)
 851                         return -ENODEV;
 852                 if (! SUBSTREAM_BUSY(substream))
 853                         return -EBADFD;
 854                 substream->ref_count++;
 855                 *rsubstream = substream;
 856                 return 0;
 857         }
 858
 859         if (prefer_subdevice >= 0) {
 860                 for (substream = pstr->substream; substream; substream = substream->next)
 861                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 862                                 goto __ok;
 863         }
 864         for (substream = pstr->substream; substream; substream = substream->next)
 865                 if (!SUBSTREAM_BUSY(substream))
 866                         break;
 867       __ok:
 868         if (substream == NULL)
 869                 return -EAGAIN;
 870
 871         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 872         if (runtime == NULL)
 873                 return -ENOMEM;
 874
 875         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
 876         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 877         if (runtime->status == NULL) {
 878                 kfree(runtime);
 879                 return -ENOMEM;
 880         }
 881         memset((void*)runtime->status, 0, size);
 882
 883         size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
 884         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 885         if (runtime->control == NULL) {
 886                 snd_free_pages((void*)runtime->status,
 887                                PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 888                 kfree(runtime);
 889                 return -ENOMEM;
 890         }
 891         memset((void*)runtime->control, 0, size);
 892
 893         init_waitqueue_head(&runtime->sleep);
 894
 895         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 896
 897         substream->runtime = runtime;
 898         substream->private_data = pcm->private_data;
 899         substream->ref_count = 1;
 900         substream->f_flags = file->f_flags;
 901         pstr->substream_opened++;
 902         *rsubstream = substream;
 903         return 0;
 904 }
 905
 906 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
 907 {
 908         struct snd_pcm_runtime *runtime;
 909
 910         runtime = substream->runtime;
 911         snd_assert(runtime != NULL, return);
 912         if (runtime->private_free != NULL)
 913                 runtime->private_free(runtime);
 914         snd_free_pages((void*)runtime->status,
 915                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
 916         snd_free_pages((void*)runtime->control,
 917                        PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
 918         kfree(runtime->hw_constraints.rules);
 919         kfree(runtime);
 920         substream->runtime = NULL;
 921         substream->pstr->substream_opened--;
 922 }
 923
 924 static ssize_t show_pcm_class(struct device *dev,
 925                               struct device_attribute *attr, char *buf)
 926 {
 927         struct snd_pcm *pcm;
 928         const char *str;
 929         static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
 930                 [SNDRV_PCM_CLASS_GENERIC] = "generic",
 931                 [SNDRV_PCM_CLASS_MULTI] = "multi",
 932                 [SNDRV_PCM_CLASS_MODEM] = "modem",
 933                 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
 934         };
 935
 936         if (! (pcm = dev_get_drvdata(dev)) ||
 937             pcm->dev_class > SNDRV_PCM_CLASS_LAST)
 938                 str = "none";
 939         else
 940                 str = strs[pcm->dev_class];
 941         return snprintf(buf, PAGE_SIZE, "%s\n", str);
 942 }
 943
 944 static struct device_attribute pcm_attrs =
 945         __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
 946
 947 static int snd_pcm_dev_register(struct snd_device *device)
 948 {
 949         int cidx, err;
 950         struct snd_pcm_substream *substream;
 951         struct snd_pcm_notify *notify;
 952         char str[16];
 953         struct snd_pcm *pcm = device->device_data;
 954         struct device *dev;
 955
 956         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 957         mutex_lock(&register_mutex);
 958         err = snd_pcm_add(pcm);
 959         if (err) {
 960                 mutex_unlock(&register_mutex);
 961                 return err;
 962         }
 963         for (cidx = 0; cidx < 2; cidx++) {
 964                 int devtype = -1;
 965                 if (pcm->streams[cidx].substream == NULL)
 966                         continue;
 967                 switch (cidx) {
 968                 case SNDRV_PCM_STREAM_PLAYBACK:
 969                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 970                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 971                         break;
 972                 case SNDRV_PCM_STREAM_CAPTURE:
 973                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 974                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 975                         break;
 976                 }
 977                 /* device pointer to use, pcm->dev takes precedence if
 978                  * it is assigned, otherwise fall back to card's device
 979                  * if possible */
 980                 dev = pcm->dev;
 981                 if (!dev)
 982                         dev = snd_card_get_device_link(pcm->card);
 983                 /* register pcm */
 984                 err = snd_register_device_for_dev(devtype, pcm->card,
 985                                                   pcm->device,
 986                                                   &snd_pcm_f_ops[cidx],
 987                                                   pcm, str, dev);
 988                 if (err < 0) {
 989                         list_del(&pcm->list);
 990                         mutex_unlock(&register_mutex);
 991                         return err;
 992                 }
 993                 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
 994                                           &pcm_attrs);
 995                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 996                         snd_pcm_timer_init(substream);
 997         }
 998
 999         list_for_each_entry(notify, &snd_pcm_notify_list, list)
1000                 notify->n_register(pcm);
1001
1002         mutex_unlock(&register_mutex);
1003         return 0;
1004 }
1005
1006 static int snd_pcm_dev_disconnect(struct snd_device *device)
1007 {
1008         struct snd_pcm *pcm = device->device_data;
1009         struct snd_pcm_notify *notify;
1010         struct snd_pcm_substream *substream;
1011         int cidx, devtype;
1012
1013         mutex_lock(&register_mutex);
1014         if (list_empty(&pcm->list))
1015                 goto unlock;
1016
1017         list_del_init(&pcm->list);
1018         for (cidx = 0; cidx < 2; cidx++)
1019                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1020                         if (substream->runtime)
1021                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1022         list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1023                 notify->n_disconnect(pcm);
1024         }
1025         for (cidx = 0; cidx < 2; cidx++) {
1026                 devtype = -1;
1027                 switch (cidx) {
1028                 case SNDRV_PCM_STREAM_PLAYBACK:
1029                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1030                         break;
1031                 case SNDRV_PCM_STREAM_CAPTURE:
1032                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1033                         break;
1034                 }
1035                 snd_unregister_device(devtype, pcm->card, pcm->device);
1036         }
1037  unlock:
1038         mutex_unlock(&register_mutex);
1039         return 0;
1040 }
1041
1042 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1043 {
1044         struct snd_pcm *pcm;
1045
1046         snd_assert(notify != NULL &&
1047                    notify->n_register != NULL &&
1048                    notify->n_unregister != NULL &&
1049                    notify->n_disconnect, return -EINVAL);
1050         mutex_lock(&register_mutex);
1051         if (nfree) {
1052                 list_del(&notify->list);
1053                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1054                         notify->n_unregister(pcm);
1055         } else {
1056                 list_add_tail(&notify->list, &snd_pcm_notify_list);
1057                 list_for_each_entry(pcm, &snd_pcm_devices, list)
1058                         notify->n_register(pcm);
1059         }
1060         mutex_unlock(&register_mutex);
1061         return 0;
1062 }
1063
1064 EXPORT_SYMBOL(snd_pcm_notify);
1065
1066 #ifdef CONFIG_PROC_FS
1067 /*
1068  *  Info interface
1069  */
1070
1071 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1072                               struct snd_info_buffer *buffer)
1073 {
1074         struct snd_pcm *pcm;
1075
1076         mutex_lock(&register_mutex);
1077         list_for_each_entry(pcm, &snd_pcm_devices, list) {
1078                 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1079                             pcm->card->number, pcm->device, pcm->id, pcm->name);
1080                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1081                         snd_iprintf(buffer, " : playback %i",
1082                                     pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1083                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1084                         snd_iprintf(buffer, " : capture %i",
1085                                     pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1086                 snd_iprintf(buffer, "\n");
1087         }
1088         mutex_unlock(&register_mutex);
1089 }
1090
1091 static struct snd_info_entry *snd_pcm_proc_entry;
1092
1093 static void snd_pcm_proc_init(void)
1094 {
1095         struct snd_info_entry *entry;
1096
1097         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1098                 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1099                 if (snd_info_register(entry) < 0) {
1100                         snd_info_free_entry(entry);
1101                         entry = NULL;
1102                 }
1103         }
1104         snd_pcm_proc_entry = entry;
1105 }
1106
1107 static void snd_pcm_proc_done(void)
1108 {
1109         snd_info_free_entry(snd_pcm_proc_entry);
1110 }
1111
1112 #else /* !CONFIG_PROC_FS */
1113 #define snd_pcm_proc_init()
1114 #define snd_pcm_proc_done()
1115 #endif /* CONFIG_PROC_FS */
1116
1117
1118 /*
1119  *  ENTRY functions
1120  */
1121
1122 static int __init alsa_pcm_init(void)
1123 {
1124         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1125         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1126         snd_pcm_proc_init();
1127         return 0;
1128 }
1129
1130 static void __exit alsa_pcm_exit(void)
1131 {
1132         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1133         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1134         snd_pcm_proc_done();
1135 }
1136
1137 module_init(alsa_pcm_init)
1138 module_exit(alsa_pcm_exit)