sound/core/pcm.c

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