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