pcm.c revision e88e8ae639a4908b903d9406c54e99a729b01a28
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 33MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 34MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 35MODULE_LICENSE("GPL"); 36 37static LIST_HEAD(snd_pcm_devices); 38static LIST_HEAD(snd_pcm_notify_list); 39static DEFINE_MUTEX(register_mutex); 40 41static int snd_pcm_free(struct snd_pcm *pcm); 42static int snd_pcm_dev_free(struct snd_device *device); 43static int snd_pcm_dev_register(struct snd_device *device); 44static int snd_pcm_dev_disconnect(struct snd_device *device); 45static int snd_pcm_dev_unregister(struct snd_device *device); 46 47static 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 60static 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(®ister_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(®ister_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(®ister_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(®ister_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 158static 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 199static const char *snd_pcm_format_name(snd_pcm_format_t format) 200{ 201 return snd_pcm_format_names[format]; 202} 203 204static char *snd_pcm_stream_names[] = { 205 STREAM(PLAYBACK), 206 STREAM(CAPTURE), 207}; 208 209static 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 220static 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 228static char *snd_pcm_subformat_names[] = { 229 SUBFORMAT(STD), 230}; 231 232static char *snd_pcm_tstamp_mode_names[] = { 233 TSTAMP(NONE), 234 TSTAMP(MMAP), 235}; 236 237static 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 243static const char *snd_pcm_access_name(snd_pcm_access_t access) 244{ 245 return snd_pcm_access_names[access]; 246} 247 248static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 249{ 250 return snd_pcm_subformat_names[subformat]; 251} 252 253static 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 259static 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 267static 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 296static 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 331static 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 338static 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 345static 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 snd_pcm_stream_lock_irq(substream); 355 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 356 snd_iprintf(buffer, "no setup\n"); 357 snd_pcm_stream_unlock_irq(substream); 358 return; 359 } 360 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 361 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 362 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 363 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 364 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 365 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 366 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 367 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time); 368#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 369 if (substream->oss.oss) { 370 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 371 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 372 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 373 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 374 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 375 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 376 } 377#endif 378 snd_pcm_stream_unlock_irq(substream); 379} 380 381static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 382 struct snd_info_buffer *buffer) 383{ 384 struct snd_pcm_substream *substream = entry->private_data; 385 struct snd_pcm_runtime *runtime = substream->runtime; 386 if (!runtime) { 387 snd_iprintf(buffer, "closed\n"); 388 return; 389 } 390 snd_pcm_stream_lock_irq(substream); 391 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 392 snd_iprintf(buffer, "no setup\n"); 393 snd_pcm_stream_unlock_irq(substream); 394 return; 395 } 396 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 397 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 398 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min); 399 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 400 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align); 401 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 402 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 403 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 404 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 405 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 406 snd_pcm_stream_unlock_irq(substream); 407} 408 409static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 410 struct snd_info_buffer *buffer) 411{ 412 struct snd_pcm_substream *substream = entry->private_data; 413 struct snd_pcm_runtime *runtime = substream->runtime; 414 struct snd_pcm_status status; 415 int err; 416 if (!runtime) { 417 snd_iprintf(buffer, "closed\n"); 418 return; 419 } 420 memset(&status, 0, sizeof(status)); 421 err = snd_pcm_status(substream, &status); 422 if (err < 0) { 423 snd_iprintf(buffer, "error %d\n", err); 424 return; 425 } 426 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 427 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 428 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 429 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 430 status.tstamp.tv_sec, status.tstamp.tv_nsec); 431 snd_iprintf(buffer, "delay : %ld\n", status.delay); 432 snd_iprintf(buffer, "avail : %ld\n", status.avail); 433 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 434 snd_iprintf(buffer, "-----\n"); 435 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 436 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 437} 438 439#ifdef CONFIG_SND_PCM_XRUN_DEBUG 440static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 441 struct snd_info_buffer *buffer) 442{ 443 struct snd_pcm_str *pstr = entry->private_data; 444 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 445} 446 447static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 448 struct snd_info_buffer *buffer) 449{ 450 struct snd_pcm_str *pstr = entry->private_data; 451 char line[64]; 452 if (!snd_info_get_line(buffer, line, sizeof(line))) 453 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 454} 455#endif 456 457static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 458{ 459 struct snd_pcm *pcm = pstr->pcm; 460 struct snd_info_entry *entry; 461 char name[16]; 462 463 sprintf(name, "pcm%i%c", pcm->device, 464 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 465 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 466 return -ENOMEM; 467 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 468 if (snd_info_register(entry) < 0) { 469 snd_info_free_entry(entry); 470 return -ENOMEM; 471 } 472 pstr->proc_root = entry; 473 474 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 475 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read); 476 if (snd_info_register(entry) < 0) { 477 snd_info_free_entry(entry); 478 entry = NULL; 479 } 480 } 481 pstr->proc_info_entry = entry; 482 483#ifdef CONFIG_SND_PCM_XRUN_DEBUG 484 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 485 pstr->proc_root)) != NULL) { 486 entry->c.text.read_size = 64; 487 entry->c.text.read = snd_pcm_xrun_debug_read; 488 entry->c.text.write_size = 64; 489 entry->c.text.write = snd_pcm_xrun_debug_write; 490 entry->mode |= S_IWUSR; 491 entry->private_data = pstr; 492 if (snd_info_register(entry) < 0) { 493 snd_info_free_entry(entry); 494 entry = NULL; 495 } 496 } 497 pstr->proc_xrun_debug_entry = entry; 498#endif 499 return 0; 500} 501 502static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 503{ 504#ifdef CONFIG_SND_PCM_XRUN_DEBUG 505 if (pstr->proc_xrun_debug_entry) { 506 snd_info_unregister(pstr->proc_xrun_debug_entry); 507 pstr->proc_xrun_debug_entry = NULL; 508 } 509#endif 510 if (pstr->proc_info_entry) { 511 snd_info_unregister(pstr->proc_info_entry); 512 pstr->proc_info_entry = NULL; 513 } 514 if (pstr->proc_root) { 515 snd_info_unregister(pstr->proc_root); 516 pstr->proc_root = NULL; 517 } 518 return 0; 519} 520 521static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 522{ 523 struct snd_info_entry *entry; 524 struct snd_card *card; 525 char name[16]; 526 527 card = substream->pcm->card; 528 529 sprintf(name, "sub%i", substream->number); 530 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 531 return -ENOMEM; 532 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 533 if (snd_info_register(entry) < 0) { 534 snd_info_free_entry(entry); 535 return -ENOMEM; 536 } 537 substream->proc_root = entry; 538 539 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 540 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read); 541 if (snd_info_register(entry) < 0) { 542 snd_info_free_entry(entry); 543 entry = NULL; 544 } 545 } 546 substream->proc_info_entry = entry; 547 548 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 549 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read); 550 if (snd_info_register(entry) < 0) { 551 snd_info_free_entry(entry); 552 entry = NULL; 553 } 554 } 555 substream->proc_hw_params_entry = entry; 556 557 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 558 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read); 559 if (snd_info_register(entry) < 0) { 560 snd_info_free_entry(entry); 561 entry = NULL; 562 } 563 } 564 substream->proc_sw_params_entry = entry; 565 566 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 567 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read); 568 if (snd_info_register(entry) < 0) { 569 snd_info_free_entry(entry); 570 entry = NULL; 571 } 572 } 573 substream->proc_status_entry = entry; 574 575 return 0; 576} 577 578static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 579{ 580 if (substream->proc_info_entry) { 581 snd_info_unregister(substream->proc_info_entry); 582 substream->proc_info_entry = NULL; 583 } 584 if (substream->proc_hw_params_entry) { 585 snd_info_unregister(substream->proc_hw_params_entry); 586 substream->proc_hw_params_entry = NULL; 587 } 588 if (substream->proc_sw_params_entry) { 589 snd_info_unregister(substream->proc_sw_params_entry); 590 substream->proc_sw_params_entry = NULL; 591 } 592 if (substream->proc_status_entry) { 593 snd_info_unregister(substream->proc_status_entry); 594 substream->proc_status_entry = NULL; 595 } 596 if (substream->proc_root) { 597 snd_info_unregister(substream->proc_root); 598 substream->proc_root = NULL; 599 } 600 return 0; 601} 602#else /* !CONFIG_SND_VERBOSE_PROCFS */ 603static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 604static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 605static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 606static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 607#endif /* CONFIG_SND_VERBOSE_PROCFS */ 608 609/** 610 * snd_pcm_new_stream - create a new PCM stream 611 * @pcm: the pcm instance 612 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 613 * @substream_count: the number of substreams 614 * 615 * Creates a new stream for the pcm. 616 * The corresponding stream on the pcm must have been empty before 617 * calling this, i.e. zero must be given to the argument of 618 * snd_pcm_new(). 619 * 620 * Returns zero if successful, or a negative error code on failure. 621 */ 622int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 623{ 624 int idx, err; 625 struct snd_pcm_str *pstr = &pcm->streams[stream]; 626 struct snd_pcm_substream *substream, *prev; 627 628#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 629 mutex_init(&pstr->oss.setup_mutex); 630#endif 631 pstr->stream = stream; 632 pstr->pcm = pcm; 633 pstr->substream_count = substream_count; 634 if (substream_count > 0) { 635 err = snd_pcm_stream_proc_init(pstr); 636 if (err < 0) { 637 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 638 return err; 639 } 640 } 641 prev = NULL; 642 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 643 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 644 if (substream == NULL) { 645 snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); 646 return -ENOMEM; 647 } 648 substream->pcm = pcm; 649 substream->pstr = pstr; 650 substream->number = idx; 651 substream->stream = stream; 652 sprintf(substream->name, "subdevice #%i", idx); 653 substream->buffer_bytes_max = UINT_MAX; 654 if (prev == NULL) 655 pstr->substream = substream; 656 else 657 prev->next = substream; 658 err = snd_pcm_substream_proc_init(substream); 659 if (err < 0) { 660 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 661 kfree(substream); 662 return err; 663 } 664 substream->group = &substream->self_group; 665 spin_lock_init(&substream->self_group.lock); 666 INIT_LIST_HEAD(&substream->self_group.substreams); 667 list_add_tail(&substream->link_list, &substream->self_group.substreams); 668 spin_lock_init(&substream->timer_lock); 669 prev = substream; 670 } 671 return 0; 672} 673 674EXPORT_SYMBOL(snd_pcm_new_stream); 675 676/** 677 * snd_pcm_new - create a new PCM instance 678 * @card: the card instance 679 * @id: the id string 680 * @device: the device index (zero based) 681 * @playback_count: the number of substreams for playback 682 * @capture_count: the number of substreams for capture 683 * @rpcm: the pointer to store the new pcm instance 684 * 685 * Creates a new PCM instance. 686 * 687 * The pcm operators have to be set afterwards to the new instance 688 * via snd_pcm_set_ops(). 689 * 690 * Returns zero if successful, or a negative error code on failure. 691 */ 692int snd_pcm_new(struct snd_card *card, char *id, int device, 693 int playback_count, int capture_count, 694 struct snd_pcm ** rpcm) 695{ 696 struct snd_pcm *pcm; 697 int err; 698 static struct snd_device_ops ops = { 699 .dev_free = snd_pcm_dev_free, 700 .dev_register = snd_pcm_dev_register, 701 .dev_disconnect = snd_pcm_dev_disconnect, 702 .dev_unregister = snd_pcm_dev_unregister 703 }; 704 705 snd_assert(rpcm != NULL, return -EINVAL); 706 *rpcm = NULL; 707 snd_assert(card != NULL, return -ENXIO); 708 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 709 if (pcm == NULL) { 710 snd_printk(KERN_ERR "Cannot allocate PCM\n"); 711 return -ENOMEM; 712 } 713 pcm->card = card; 714 pcm->device = device; 715 if (id) 716 strlcpy(pcm->id, id, sizeof(pcm->id)); 717 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 718 snd_pcm_free(pcm); 719 return err; 720 } 721 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 722 snd_pcm_free(pcm); 723 return err; 724 } 725 mutex_init(&pcm->open_mutex); 726 init_waitqueue_head(&pcm->open_wait); 727 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 728 snd_pcm_free(pcm); 729 return err; 730 } 731 *rpcm = pcm; 732 return 0; 733} 734 735EXPORT_SYMBOL(snd_pcm_new); 736 737static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 738{ 739 struct snd_pcm_substream *substream, *substream_next; 740#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 741 struct snd_pcm_oss_setup *setup, *setupn; 742#endif 743 substream = pstr->substream; 744 while (substream) { 745 substream_next = substream->next; 746 snd_pcm_substream_proc_done(substream); 747 kfree(substream); 748 substream = substream_next; 749 } 750 snd_pcm_stream_proc_done(pstr); 751#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 752 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 753 setupn = setup->next; 754 kfree(setup->task_name); 755 kfree(setup); 756 } 757#endif 758} 759 760static int snd_pcm_free(struct snd_pcm *pcm) 761{ 762 snd_assert(pcm != NULL, return -ENXIO); 763 if (pcm->private_free) 764 pcm->private_free(pcm); 765 snd_pcm_lib_preallocate_free_for_all(pcm); 766 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 767 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 768 kfree(pcm); 769 return 0; 770} 771 772static int snd_pcm_dev_free(struct snd_device *device) 773{ 774 struct snd_pcm *pcm = device->device_data; 775 return snd_pcm_free(pcm); 776} 777 778static void snd_pcm_tick_timer_func(unsigned long data) 779{ 780 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data; 781 snd_pcm_tick_elapsed(substream); 782} 783 784int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 785 struct file *file, 786 struct snd_pcm_substream **rsubstream) 787{ 788 struct snd_pcm_str * pstr; 789 struct snd_pcm_substream *substream; 790 struct snd_pcm_runtime *runtime; 791 struct snd_ctl_file *kctl; 792 struct snd_card *card; 793 struct list_head *list; 794 int prefer_subdevice = -1; 795 size_t size; 796 797 snd_assert(rsubstream != NULL, return -EINVAL); 798 *rsubstream = NULL; 799 snd_assert(pcm != NULL, return -ENXIO); 800 pstr = &pcm->streams[stream]; 801 if (pstr->substream == NULL || pstr->substream_count == 0) 802 return -ENODEV; 803 804 card = pcm->card; 805 down_read(&card->controls_rwsem); 806 list_for_each(list, &card->ctl_files) { 807 kctl = snd_ctl_file(list); 808 if (kctl->pid == current->pid) { 809 prefer_subdevice = kctl->prefer_pcm_subdevice; 810 break; 811 } 812 } 813 up_read(&card->controls_rwsem); 814 815 switch (stream) { 816 case SNDRV_PCM_STREAM_PLAYBACK: 817 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 818 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 819 if (SUBSTREAM_BUSY(substream)) 820 return -EAGAIN; 821 } 822 } 823 break; 824 case SNDRV_PCM_STREAM_CAPTURE: 825 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 826 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 827 if (SUBSTREAM_BUSY(substream)) 828 return -EAGAIN; 829 } 830 } 831 break; 832 default: 833 return -EINVAL; 834 } 835 836 if (prefer_subdevice >= 0) { 837 for (substream = pstr->substream; substream; substream = substream->next) 838 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 839 goto __ok; 840 } 841 for (substream = pstr->substream; substream; substream = substream->next) 842 if (!SUBSTREAM_BUSY(substream)) 843 break; 844 __ok: 845 if (substream == NULL) 846 return -EAGAIN; 847 848 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 849 if (runtime == NULL) 850 return -ENOMEM; 851 852 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 853 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 854 if (runtime->status == NULL) { 855 kfree(runtime); 856 return -ENOMEM; 857 } 858 memset((void*)runtime->status, 0, size); 859 860 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 861 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 862 if (runtime->control == NULL) { 863 snd_free_pages((void*)runtime->status, 864 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 865 kfree(runtime); 866 return -ENOMEM; 867 } 868 memset((void*)runtime->control, 0, size); 869 870 init_waitqueue_head(&runtime->sleep); 871 atomic_set(&runtime->mmap_count, 0); 872 init_timer(&runtime->tick_timer); 873 runtime->tick_timer.function = snd_pcm_tick_timer_func; 874 runtime->tick_timer.data = (unsigned long) substream; 875 876 runtime->status->state = SNDRV_PCM_STATE_OPEN; 877 878 substream->runtime = runtime; 879 substream->private_data = pcm->private_data; 880 substream->ffile = file; 881 pstr->substream_opened++; 882 *rsubstream = substream; 883 return 0; 884} 885 886void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 887{ 888 struct snd_pcm_runtime *runtime; 889 substream->file = NULL; 890 runtime = substream->runtime; 891 snd_assert(runtime != NULL, return); 892 if (runtime->private_free != NULL) 893 runtime->private_free(runtime); 894 snd_free_pages((void*)runtime->status, 895 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 896 snd_free_pages((void*)runtime->control, 897 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 898 kfree(runtime->hw_constraints.rules); 899 kfree(runtime); 900 substream->runtime = NULL; 901 substream->pstr->substream_opened--; 902} 903 904static int snd_pcm_dev_register(struct snd_device *device) 905{ 906 int cidx, err; 907 struct snd_pcm_substream *substream; 908 struct list_head *list; 909 char str[16]; 910 struct snd_pcm *pcm = device->device_data; 911 912 snd_assert(pcm != NULL && device != NULL, return -ENXIO); 913 mutex_lock(®ister_mutex); 914 if (snd_pcm_search(pcm->card, pcm->device)) { 915 mutex_unlock(®ister_mutex); 916 return -EBUSY; 917 } 918 list_add_tail(&pcm->list, &snd_pcm_devices); 919 for (cidx = 0; cidx < 2; cidx++) { 920 int devtype = -1; 921 if (pcm->streams[cidx].substream == NULL) 922 continue; 923 switch (cidx) { 924 case SNDRV_PCM_STREAM_PLAYBACK: 925 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 926 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 927 break; 928 case SNDRV_PCM_STREAM_CAPTURE: 929 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 930 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 931 break; 932 } 933 if ((err = snd_register_device(devtype, pcm->card, 934 pcm->device, 935 &snd_pcm_f_ops[cidx], 936 pcm, str)) < 0) 937 { 938 list_del(&pcm->list); 939 mutex_unlock(®ister_mutex); 940 return err; 941 } 942 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 943 snd_pcm_timer_init(substream); 944 } 945 list_for_each(list, &snd_pcm_notify_list) { 946 struct snd_pcm_notify *notify; 947 notify = list_entry(list, struct snd_pcm_notify, list); 948 notify->n_register(pcm); 949 } 950 mutex_unlock(®ister_mutex); 951 return 0; 952} 953 954static int snd_pcm_dev_disconnect(struct snd_device *device) 955{ 956 struct snd_pcm *pcm = device->device_data; 957 struct list_head *list; 958 struct snd_pcm_substream *substream; 959 int cidx; 960 961 mutex_lock(®ister_mutex); 962 list_del_init(&pcm->list); 963 for (cidx = 0; cidx < 2; cidx++) 964 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 965 if (substream->runtime) 966 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 967 list_for_each(list, &snd_pcm_notify_list) { 968 struct snd_pcm_notify *notify; 969 notify = list_entry(list, struct snd_pcm_notify, list); 970 notify->n_disconnect(pcm); 971 } 972 mutex_unlock(®ister_mutex); 973 return 0; 974} 975 976static int snd_pcm_dev_unregister(struct snd_device *device) 977{ 978 int cidx, devtype; 979 struct snd_pcm_substream *substream; 980 struct list_head *list; 981 struct snd_pcm *pcm = device->device_data; 982 983 snd_assert(pcm != NULL, return -ENXIO); 984 mutex_lock(®ister_mutex); 985 list_del(&pcm->list); 986 for (cidx = 0; cidx < 2; cidx++) { 987 devtype = -1; 988 switch (cidx) { 989 case SNDRV_PCM_STREAM_PLAYBACK: 990 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 991 break; 992 case SNDRV_PCM_STREAM_CAPTURE: 993 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 994 break; 995 } 996 snd_unregister_device(devtype, pcm->card, pcm->device); 997 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 998 snd_pcm_timer_done(substream); 999 } 1000 list_for_each(list, &snd_pcm_notify_list) { 1001 struct snd_pcm_notify *notify; 1002 notify = list_entry(list, struct snd_pcm_notify, list); 1003 notify->n_unregister(pcm); 1004 } 1005 mutex_unlock(®ister_mutex); 1006 return snd_pcm_free(pcm); 1007} 1008 1009int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1010{ 1011 struct list_head *p; 1012 1013 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); 1014 mutex_lock(®ister_mutex); 1015 if (nfree) { 1016 list_del(¬ify->list); 1017 list_for_each(p, &snd_pcm_devices) 1018 notify->n_unregister(list_entry(p, 1019 struct snd_pcm, list)); 1020 } else { 1021 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1022 list_for_each(p, &snd_pcm_devices) 1023 notify->n_register(list_entry(p, struct snd_pcm, list)); 1024 } 1025 mutex_unlock(®ister_mutex); 1026 return 0; 1027} 1028 1029EXPORT_SYMBOL(snd_pcm_notify); 1030 1031#ifdef CONFIG_PROC_FS 1032/* 1033 * Info interface 1034 */ 1035 1036static void snd_pcm_proc_read(struct snd_info_entry *entry, 1037 struct snd_info_buffer *buffer) 1038{ 1039 struct list_head *p; 1040 struct snd_pcm *pcm; 1041 1042 mutex_lock(®ister_mutex); 1043 list_for_each(p, &snd_pcm_devices) { 1044 pcm = list_entry(p, struct snd_pcm, list); 1045 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1046 pcm->card->number, pcm->device, pcm->id, pcm->name); 1047 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1048 snd_iprintf(buffer, " : playback %i", 1049 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1050 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1051 snd_iprintf(buffer, " : capture %i", 1052 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1053 snd_iprintf(buffer, "\n"); 1054 } 1055 mutex_unlock(®ister_mutex); 1056} 1057 1058static struct snd_info_entry *snd_pcm_proc_entry = NULL; 1059 1060static void snd_pcm_proc_init(void) 1061{ 1062 struct snd_info_entry *entry; 1063 1064 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1065 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, 1066 snd_pcm_proc_read); 1067 if (snd_info_register(entry) < 0) { 1068 snd_info_free_entry(entry); 1069 entry = NULL; 1070 } 1071 } 1072 snd_pcm_proc_entry = entry; 1073} 1074 1075static void snd_pcm_proc_done(void) 1076{ 1077 if (snd_pcm_proc_entry) 1078 snd_info_unregister(snd_pcm_proc_entry); 1079} 1080 1081#else /* !CONFIG_PROC_FS */ 1082#define snd_pcm_proc_init() 1083#define snd_pcm_proc_done() 1084#endif /* CONFIG_PROC_FS */ 1085 1086 1087/* 1088 * ENTRY functions 1089 */ 1090 1091static int __init alsa_pcm_init(void) 1092{ 1093 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1094 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1095 snd_pcm_proc_init(); 1096 return 0; 1097} 1098 1099static void __exit alsa_pcm_exit(void) 1100{ 1101 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1102 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1103 snd_pcm_proc_done(); 1104} 1105 1106module_init(alsa_pcm_init) 1107module_exit(alsa_pcm_exit) 1108