1/* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22#include <linux/init.h> 23#include <linux/slab.h> 24#include <linux/time.h> 25#include <linux/mutex.h> 26#include <sound/core.h> 27#include <sound/minors.h> 28#include <sound/pcm.h> 29#include <sound/control.h> 30#include <sound/info.h> 31 32MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 33MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 34MODULE_LICENSE("GPL"); 35 36static LIST_HEAD(snd_pcm_devices); 37static LIST_HEAD(snd_pcm_notify_list); 38static DEFINE_MUTEX(register_mutex); 39 40static int snd_pcm_free(struct snd_pcm *pcm); 41static int snd_pcm_dev_free(struct snd_device *device); 42static int snd_pcm_dev_register(struct snd_device *device); 43static int snd_pcm_dev_disconnect(struct snd_device *device); 44 45static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) 46{ 47 struct snd_pcm *pcm; 48 49 list_for_each_entry(pcm, &snd_pcm_devices, list) { 50 if (pcm->card == card && pcm->device == device) 51 return pcm; 52 } 53 return NULL; 54} 55 56static int snd_pcm_next(struct snd_card *card, int device) 57{ 58 struct snd_pcm *pcm; 59 60 list_for_each_entry(pcm, &snd_pcm_devices, list) { 61 if (pcm->card == card && pcm->device > device) 62 return pcm->device; 63 else if (pcm->card->number > card->number) 64 return -1; 65 } 66 return -1; 67} 68 69static int snd_pcm_add(struct snd_pcm *newpcm) 70{ 71 struct snd_pcm *pcm; 72 73 list_for_each_entry(pcm, &snd_pcm_devices, list) { 74 if (pcm->card == newpcm->card && pcm->device == newpcm->device) 75 return -EBUSY; 76 if (pcm->card->number > newpcm->card->number || 77 (pcm->card == newpcm->card && 78 pcm->device > newpcm->device)) { 79 list_add(&newpcm->list, pcm->list.prev); 80 return 0; 81 } 82 } 83 list_add_tail(&newpcm->list, &snd_pcm_devices); 84 return 0; 85} 86 87static int snd_pcm_control_ioctl(struct snd_card *card, 88 struct snd_ctl_file *control, 89 unsigned int cmd, unsigned long arg) 90{ 91 switch (cmd) { 92 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 93 { 94 int device; 95 96 if (get_user(device, (int __user *)arg)) 97 return -EFAULT; 98 mutex_lock(®ister_mutex); 99 device = snd_pcm_next(card, device); 100 mutex_unlock(®ister_mutex); 101 if (put_user(device, (int __user *)arg)) 102 return -EFAULT; 103 return 0; 104 } 105 case SNDRV_CTL_IOCTL_PCM_INFO: 106 { 107 struct snd_pcm_info __user *info; 108 unsigned int device, subdevice; 109 int stream; 110 struct snd_pcm *pcm; 111 struct snd_pcm_str *pstr; 112 struct snd_pcm_substream *substream; 113 int err; 114 115 info = (struct snd_pcm_info __user *)arg; 116 if (get_user(device, &info->device)) 117 return -EFAULT; 118 if (get_user(stream, &info->stream)) 119 return -EFAULT; 120 if (stream < 0 || stream > 1) 121 return -EINVAL; 122 if (get_user(subdevice, &info->subdevice)) 123 return -EFAULT; 124 mutex_lock(®ister_mutex); 125 pcm = snd_pcm_get(card, device); 126 if (pcm == NULL) { 127 err = -ENXIO; 128 goto _error; 129 } 130 pstr = &pcm->streams[stream]; 131 if (pstr->substream_count == 0) { 132 err = -ENOENT; 133 goto _error; 134 } 135 if (subdevice >= pstr->substream_count) { 136 err = -ENXIO; 137 goto _error; 138 } 139 for (substream = pstr->substream; substream; 140 substream = substream->next) 141 if (substream->number == (int)subdevice) 142 break; 143 if (substream == NULL) { 144 err = -ENXIO; 145 goto _error; 146 } 147 err = snd_pcm_info_user(substream, info); 148 _error: 149 mutex_unlock(®ister_mutex); 150 return err; 151 } 152 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 153 { 154 int val; 155 156 if (get_user(val, (int __user *)arg)) 157 return -EFAULT; 158 control->prefer_pcm_subdevice = val; 159 return 0; 160 } 161 } 162 return -ENOIOCTLCMD; 163} 164 165#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 166 167static char *snd_pcm_format_names[] = { 168 FORMAT(S8), 169 FORMAT(U8), 170 FORMAT(S16_LE), 171 FORMAT(S16_BE), 172 FORMAT(U16_LE), 173 FORMAT(U16_BE), 174 FORMAT(S24_LE), 175 FORMAT(S24_BE), 176 FORMAT(U24_LE), 177 FORMAT(U24_BE), 178 FORMAT(S32_LE), 179 FORMAT(S32_BE), 180 FORMAT(U32_LE), 181 FORMAT(U32_BE), 182 FORMAT(FLOAT_LE), 183 FORMAT(FLOAT_BE), 184 FORMAT(FLOAT64_LE), 185 FORMAT(FLOAT64_BE), 186 FORMAT(IEC958_SUBFRAME_LE), 187 FORMAT(IEC958_SUBFRAME_BE), 188 FORMAT(MU_LAW), 189 FORMAT(A_LAW), 190 FORMAT(IMA_ADPCM), 191 FORMAT(MPEG), 192 FORMAT(GSM), 193 FORMAT(SPECIAL), 194 FORMAT(S24_3LE), 195 FORMAT(S24_3BE), 196 FORMAT(U24_3LE), 197 FORMAT(U24_3BE), 198 FORMAT(S20_3LE), 199 FORMAT(S20_3BE), 200 FORMAT(U20_3LE), 201 FORMAT(U20_3BE), 202 FORMAT(S18_3LE), 203 FORMAT(S18_3BE), 204 FORMAT(U18_3LE), 205 FORMAT(U18_3BE), 206 FORMAT(G723_24), 207 FORMAT(G723_24_1B), 208 FORMAT(G723_40), 209 FORMAT(G723_40_1B), 210}; 211 212const char *snd_pcm_format_name(snd_pcm_format_t format) 213{ 214 if (format >= ARRAY_SIZE(snd_pcm_format_names)) 215 return "Unknown"; 216 return snd_pcm_format_names[format]; 217} 218EXPORT_SYMBOL_GPL(snd_pcm_format_name); 219 220#ifdef CONFIG_SND_VERBOSE_PROCFS 221 222#define STATE(v) [SNDRV_PCM_STATE_##v] = #v 223#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 224#define READY(v) [SNDRV_PCM_READY_##v] = #v 225#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 226#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 227#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 228#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 229#define START(v) [SNDRV_PCM_START_##v] = #v 230#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 231 232static char *snd_pcm_stream_names[] = { 233 STREAM(PLAYBACK), 234 STREAM(CAPTURE), 235}; 236 237static char *snd_pcm_state_names[] = { 238 STATE(OPEN), 239 STATE(SETUP), 240 STATE(PREPARED), 241 STATE(RUNNING), 242 STATE(XRUN), 243 STATE(DRAINING), 244 STATE(PAUSED), 245 STATE(SUSPENDED), 246}; 247 248static char *snd_pcm_access_names[] = { 249 ACCESS(MMAP_INTERLEAVED), 250 ACCESS(MMAP_NONINTERLEAVED), 251 ACCESS(MMAP_COMPLEX), 252 ACCESS(RW_INTERLEAVED), 253 ACCESS(RW_NONINTERLEAVED), 254}; 255 256static char *snd_pcm_subformat_names[] = { 257 SUBFORMAT(STD), 258}; 259 260static char *snd_pcm_tstamp_mode_names[] = { 261 TSTAMP(NONE), 262 TSTAMP(ENABLE), 263}; 264 265static const char *snd_pcm_stream_name(int stream) 266{ 267 return snd_pcm_stream_names[stream]; 268} 269 270static const char *snd_pcm_access_name(snd_pcm_access_t access) 271{ 272 return snd_pcm_access_names[access]; 273} 274 275static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 276{ 277 return snd_pcm_subformat_names[subformat]; 278} 279 280static const char *snd_pcm_tstamp_mode_name(int mode) 281{ 282 return snd_pcm_tstamp_mode_names[mode]; 283} 284 285static const char *snd_pcm_state_name(snd_pcm_state_t state) 286{ 287 return snd_pcm_state_names[state]; 288} 289 290#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 291#include <linux/soundcard.h> 292 293static const char *snd_pcm_oss_format_name(int format) 294{ 295 switch (format) { 296 case AFMT_MU_LAW: 297 return "MU_LAW"; 298 case AFMT_A_LAW: 299 return "A_LAW"; 300 case AFMT_IMA_ADPCM: 301 return "IMA_ADPCM"; 302 case AFMT_U8: 303 return "U8"; 304 case AFMT_S16_LE: 305 return "S16_LE"; 306 case AFMT_S16_BE: 307 return "S16_BE"; 308 case AFMT_S8: 309 return "S8"; 310 case AFMT_U16_LE: 311 return "U16_LE"; 312 case AFMT_U16_BE: 313 return "U16_BE"; 314 case AFMT_MPEG: 315 return "MPEG"; 316 default: 317 return "unknown"; 318 } 319} 320#endif 321 322static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 323 struct snd_info_buffer *buffer) 324{ 325 struct snd_pcm_info *info; 326 int err; 327 328 if (! substream) 329 return; 330 331 info = kmalloc(sizeof(*info), GFP_KERNEL); 332 if (! info) { 333 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 334 return; 335 } 336 337 err = snd_pcm_info(substream, info); 338 if (err < 0) { 339 snd_iprintf(buffer, "error %d\n", err); 340 kfree(info); 341 return; 342 } 343 snd_iprintf(buffer, "card: %d\n", info->card); 344 snd_iprintf(buffer, "device: %d\n", info->device); 345 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 346 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 347 snd_iprintf(buffer, "id: %s\n", info->id); 348 snd_iprintf(buffer, "name: %s\n", info->name); 349 snd_iprintf(buffer, "subname: %s\n", info->subname); 350 snd_iprintf(buffer, "class: %d\n", info->dev_class); 351 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 352 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 353 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 354 kfree(info); 355} 356 357static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 358 struct snd_info_buffer *buffer) 359{ 360 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 361 buffer); 362} 363 364static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 365 struct snd_info_buffer *buffer) 366{ 367 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data, 368 buffer); 369} 370 371static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 372 struct snd_info_buffer *buffer) 373{ 374 struct snd_pcm_substream *substream = entry->private_data; 375 struct snd_pcm_runtime *runtime; 376 377 mutex_lock(&substream->pcm->open_mutex); 378 runtime = substream->runtime; 379 if (!runtime) { 380 snd_iprintf(buffer, "closed\n"); 381 goto unlock; 382 } 383 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 384 snd_iprintf(buffer, "no setup\n"); 385 goto unlock; 386 } 387 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 388 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 389 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 390 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 391 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 392 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 393 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 394#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 395 if (substream->oss.oss) { 396 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 397 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 398 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 399 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 400 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 401 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 402 } 403#endif 404 unlock: 405 mutex_unlock(&substream->pcm->open_mutex); 406} 407 408static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 409 struct snd_info_buffer *buffer) 410{ 411 struct snd_pcm_substream *substream = entry->private_data; 412 struct snd_pcm_runtime *runtime; 413 414 mutex_lock(&substream->pcm->open_mutex); 415 runtime = substream->runtime; 416 if (!runtime) { 417 snd_iprintf(buffer, "closed\n"); 418 goto unlock; 419 } 420 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 421 snd_iprintf(buffer, "no setup\n"); 422 goto unlock; 423 } 424 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 425 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 426 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 427 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 428 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 429 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 430 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 431 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 432 unlock: 433 mutex_unlock(&substream->pcm->open_mutex); 434} 435 436static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 437 struct snd_info_buffer *buffer) 438{ 439 struct snd_pcm_substream *substream = entry->private_data; 440 struct snd_pcm_runtime *runtime; 441 struct snd_pcm_status status; 442 int err; 443 444 mutex_lock(&substream->pcm->open_mutex); 445 runtime = substream->runtime; 446 if (!runtime) { 447 snd_iprintf(buffer, "closed\n"); 448 goto unlock; 449 } 450 memset(&status, 0, sizeof(status)); 451 err = snd_pcm_status(substream, &status); 452 if (err < 0) { 453 snd_iprintf(buffer, "error %d\n", err); 454 goto unlock; 455 } 456 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 457 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); 458 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 459 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 460 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 461 status.tstamp.tv_sec, status.tstamp.tv_nsec); 462 snd_iprintf(buffer, "delay : %ld\n", status.delay); 463 snd_iprintf(buffer, "avail : %ld\n", status.avail); 464 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 465 snd_iprintf(buffer, "-----\n"); 466 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 467 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 468 unlock: 469 mutex_unlock(&substream->pcm->open_mutex); 470} 471 472#ifdef CONFIG_SND_PCM_XRUN_DEBUG 473static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 474 struct snd_info_buffer *buffer) 475{ 476 struct snd_pcm_str *pstr = entry->private_data; 477 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 478} 479 480static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 481 struct snd_info_buffer *buffer) 482{ 483 struct snd_pcm_str *pstr = entry->private_data; 484 char line[64]; 485 if (!snd_info_get_line(buffer, line, sizeof(line))) 486 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 487} 488#endif 489 490static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 491{ 492 struct snd_pcm *pcm = pstr->pcm; 493 struct snd_info_entry *entry; 494 char name[16]; 495 496 sprintf(name, "pcm%i%c", pcm->device, 497 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 498 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 499 return -ENOMEM; 500 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 501 if (snd_info_register(entry) < 0) { 502 snd_info_free_entry(entry); 503 return -ENOMEM; 504 } 505 pstr->proc_root = entry; 506 507 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 508 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); 509 if (snd_info_register(entry) < 0) { 510 snd_info_free_entry(entry); 511 entry = NULL; 512 } 513 } 514 pstr->proc_info_entry = entry; 515 516#ifdef CONFIG_SND_PCM_XRUN_DEBUG 517 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 518 pstr->proc_root)) != NULL) { 519 entry->c.text.read = snd_pcm_xrun_debug_read; 520 entry->c.text.write = snd_pcm_xrun_debug_write; 521 entry->mode |= S_IWUSR; 522 entry->private_data = pstr; 523 if (snd_info_register(entry) < 0) { 524 snd_info_free_entry(entry); 525 entry = NULL; 526 } 527 } 528 pstr->proc_xrun_debug_entry = entry; 529#endif 530 return 0; 531} 532 533static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 534{ 535#ifdef CONFIG_SND_PCM_XRUN_DEBUG 536 snd_info_free_entry(pstr->proc_xrun_debug_entry); 537 pstr->proc_xrun_debug_entry = NULL; 538#endif 539 snd_info_free_entry(pstr->proc_info_entry); 540 pstr->proc_info_entry = NULL; 541 snd_info_free_entry(pstr->proc_root); 542 pstr->proc_root = NULL; 543 return 0; 544} 545 546static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 547{ 548 struct snd_info_entry *entry; 549 struct snd_card *card; 550 char name[16]; 551 552 card = substream->pcm->card; 553 554 sprintf(name, "sub%i", substream->number); 555 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 556 return -ENOMEM; 557 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 558 if (snd_info_register(entry) < 0) { 559 snd_info_free_entry(entry); 560 return -ENOMEM; 561 } 562 substream->proc_root = entry; 563 564 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 565 snd_info_set_text_ops(entry, substream, 566 snd_pcm_substream_proc_info_read); 567 if (snd_info_register(entry) < 0) { 568 snd_info_free_entry(entry); 569 entry = NULL; 570 } 571 } 572 substream->proc_info_entry = entry; 573 574 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 575 snd_info_set_text_ops(entry, substream, 576 snd_pcm_substream_proc_hw_params_read); 577 if (snd_info_register(entry) < 0) { 578 snd_info_free_entry(entry); 579 entry = NULL; 580 } 581 } 582 substream->proc_hw_params_entry = entry; 583 584 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 585 snd_info_set_text_ops(entry, substream, 586 snd_pcm_substream_proc_sw_params_read); 587 if (snd_info_register(entry) < 0) { 588 snd_info_free_entry(entry); 589 entry = NULL; 590 } 591 } 592 substream->proc_sw_params_entry = entry; 593 594 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 595 snd_info_set_text_ops(entry, substream, 596 snd_pcm_substream_proc_status_read); 597 if (snd_info_register(entry) < 0) { 598 snd_info_free_entry(entry); 599 entry = NULL; 600 } 601 } 602 substream->proc_status_entry = entry; 603 604 return 0; 605} 606 607static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 608{ 609 snd_info_free_entry(substream->proc_info_entry); 610 substream->proc_info_entry = NULL; 611 snd_info_free_entry(substream->proc_hw_params_entry); 612 substream->proc_hw_params_entry = NULL; 613 snd_info_free_entry(substream->proc_sw_params_entry); 614 substream->proc_sw_params_entry = NULL; 615 snd_info_free_entry(substream->proc_status_entry); 616 substream->proc_status_entry = NULL; 617 snd_info_free_entry(substream->proc_root); 618 substream->proc_root = NULL; 619 return 0; 620} 621#else /* !CONFIG_SND_VERBOSE_PROCFS */ 622static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 623static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 624static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 625static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 626#endif /* CONFIG_SND_VERBOSE_PROCFS */ 627 628/** 629 * snd_pcm_new_stream - create a new PCM stream 630 * @pcm: the pcm instance 631 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 632 * @substream_count: the number of substreams 633 * 634 * Creates a new stream for the pcm. 635 * The corresponding stream on the pcm must have been empty before 636 * calling this, i.e. zero must be given to the argument of 637 * snd_pcm_new(). 638 * 639 * Returns zero if successful, or a negative error code on failure. 640 */ 641int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 642{ 643 int idx, err; 644 struct snd_pcm_str *pstr = &pcm->streams[stream]; 645 struct snd_pcm_substream *substream, *prev; 646 647#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 648 mutex_init(&pstr->oss.setup_mutex); 649#endif 650 pstr->stream = stream; 651 pstr->pcm = pcm; 652 pstr->substream_count = substream_count; 653 if (substream_count > 0) { 654 err = snd_pcm_stream_proc_init(pstr); 655 if (err < 0) { 656 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 657 return err; 658 } 659 } 660 prev = NULL; 661 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 662 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 663 if (substream == NULL) { 664 snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); 665 return -ENOMEM; 666 } 667 substream->pcm = pcm; 668 substream->pstr = pstr; 669 substream->number = idx; 670 substream->stream = stream; 671 sprintf(substream->name, "subdevice #%i", idx); 672 substream->buffer_bytes_max = UINT_MAX; 673 if (prev == NULL) 674 pstr->substream = substream; 675 else 676 prev->next = substream; 677 err = snd_pcm_substream_proc_init(substream); 678 if (err < 0) { 679 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 680 if (prev == NULL) 681 pstr->substream = NULL; 682 else 683 prev->next = NULL; 684 kfree(substream); 685 return err; 686 } 687 substream->group = &substream->self_group; 688 spin_lock_init(&substream->self_group.lock); 689 INIT_LIST_HEAD(&substream->self_group.substreams); 690 list_add_tail(&substream->link_list, &substream->self_group.substreams); 691 atomic_set(&substream->mmap_count, 0); 692 prev = substream; 693 } 694 return 0; 695} 696 697EXPORT_SYMBOL(snd_pcm_new_stream); 698 699/** 700 * snd_pcm_new - create a new PCM instance 701 * @card: the card instance 702 * @id: the id string 703 * @device: the device index (zero based) 704 * @playback_count: the number of substreams for playback 705 * @capture_count: the number of substreams for capture 706 * @rpcm: the pointer to store the new pcm instance 707 * 708 * Creates a new PCM instance. 709 * 710 * The pcm operators have to be set afterwards to the new instance 711 * via snd_pcm_set_ops(). 712 * 713 * Returns zero if successful, or a negative error code on failure. 714 */ 715int snd_pcm_new(struct snd_card *card, const char *id, int device, 716 int playback_count, int capture_count, 717 struct snd_pcm ** rpcm) 718{ 719 struct snd_pcm *pcm; 720 int err; 721 static struct snd_device_ops ops = { 722 .dev_free = snd_pcm_dev_free, 723 .dev_register = snd_pcm_dev_register, 724 .dev_disconnect = snd_pcm_dev_disconnect, 725 }; 726 727 if (snd_BUG_ON(!card)) 728 return -ENXIO; 729 if (rpcm) 730 *rpcm = NULL; 731 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 732 if (pcm == NULL) { 733 snd_printk(KERN_ERR "Cannot allocate PCM\n"); 734 return -ENOMEM; 735 } 736 pcm->card = card; 737 pcm->device = device; 738 if (id) 739 strlcpy(pcm->id, id, sizeof(pcm->id)); 740 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 741 snd_pcm_free(pcm); 742 return err; 743 } 744 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 745 snd_pcm_free(pcm); 746 return err; 747 } 748 mutex_init(&pcm->open_mutex); 749 init_waitqueue_head(&pcm->open_wait); 750 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 751 snd_pcm_free(pcm); 752 return err; 753 } 754 if (rpcm) 755 *rpcm = pcm; 756 return 0; 757} 758 759EXPORT_SYMBOL(snd_pcm_new); 760 761static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 762{ 763 struct snd_pcm_substream *substream, *substream_next; 764#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 765 struct snd_pcm_oss_setup *setup, *setupn; 766#endif 767 substream = pstr->substream; 768 while (substream) { 769 substream_next = substream->next; 770 snd_pcm_timer_done(substream); 771 snd_pcm_substream_proc_done(substream); 772 kfree(substream); 773 substream = substream_next; 774 } 775 snd_pcm_stream_proc_done(pstr); 776#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 777 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 778 setupn = setup->next; 779 kfree(setup->task_name); 780 kfree(setup); 781 } 782#endif 783} 784 785static int snd_pcm_free(struct snd_pcm *pcm) 786{ 787 struct snd_pcm_notify *notify; 788 789 if (!pcm) 790 return 0; 791 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 792 notify->n_unregister(pcm); 793 } 794 if (pcm->private_free) 795 pcm->private_free(pcm); 796 snd_pcm_lib_preallocate_free_for_all(pcm); 797 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 798 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 799 kfree(pcm); 800 return 0; 801} 802 803static int snd_pcm_dev_free(struct snd_device *device) 804{ 805 struct snd_pcm *pcm = device->device_data; 806 return snd_pcm_free(pcm); 807} 808 809int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 810 struct file *file, 811 struct snd_pcm_substream **rsubstream) 812{ 813 struct snd_pcm_str * pstr; 814 struct snd_pcm_substream *substream; 815 struct snd_pcm_runtime *runtime; 816 struct snd_ctl_file *kctl; 817 struct snd_card *card; 818 int prefer_subdevice = -1; 819 size_t size; 820 821 if (snd_BUG_ON(!pcm || !rsubstream)) 822 return -ENXIO; 823 *rsubstream = NULL; 824 pstr = &pcm->streams[stream]; 825 if (pstr->substream == NULL || pstr->substream_count == 0) 826 return -ENODEV; 827 828 card = pcm->card; 829 read_lock(&card->ctl_files_rwlock); 830 list_for_each_entry(kctl, &card->ctl_files, list) { 831 if (kctl->pid == task_pid(current)) { 832 prefer_subdevice = kctl->prefer_pcm_subdevice; 833 if (prefer_subdevice != -1) 834 break; 835 } 836 } 837 read_unlock(&card->ctl_files_rwlock); 838 839 switch (stream) { 840 case SNDRV_PCM_STREAM_PLAYBACK: 841 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 842 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 843 if (SUBSTREAM_BUSY(substream)) 844 return -EAGAIN; 845 } 846 } 847 break; 848 case SNDRV_PCM_STREAM_CAPTURE: 849 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 850 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 851 if (SUBSTREAM_BUSY(substream)) 852 return -EAGAIN; 853 } 854 } 855 break; 856 default: 857 return -EINVAL; 858 } 859 860 if (file->f_flags & O_APPEND) { 861 if (prefer_subdevice < 0) { 862 if (pstr->substream_count > 1) 863 return -EINVAL; /* must be unique */ 864 substream = pstr->substream; 865 } else { 866 for (substream = pstr->substream; substream; 867 substream = substream->next) 868 if (substream->number == prefer_subdevice) 869 break; 870 } 871 if (! substream) 872 return -ENODEV; 873 if (! SUBSTREAM_BUSY(substream)) 874 return -EBADFD; 875 substream->ref_count++; 876 *rsubstream = substream; 877 return 0; 878 } 879 880 if (prefer_subdevice >= 0) { 881 for (substream = pstr->substream; substream; substream = substream->next) 882 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 883 goto __ok; 884 } 885 for (substream = pstr->substream; substream; substream = substream->next) 886 if (!SUBSTREAM_BUSY(substream)) 887 break; 888 __ok: 889 if (substream == NULL) 890 return -EAGAIN; 891 892 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 893 if (runtime == NULL) 894 return -ENOMEM; 895 896 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 897 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 898 if (runtime->status == NULL) { 899 kfree(runtime); 900 return -ENOMEM; 901 } 902 memset((void*)runtime->status, 0, size); 903 904 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 905 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 906 if (runtime->control == NULL) { 907 snd_free_pages((void*)runtime->status, 908 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 909 kfree(runtime); 910 return -ENOMEM; 911 } 912 memset((void*)runtime->control, 0, size); 913 914 init_waitqueue_head(&runtime->sleep); 915 init_waitqueue_head(&runtime->tsleep); 916 917 runtime->status->state = SNDRV_PCM_STATE_OPEN; 918 919 substream->runtime = runtime; 920 substream->private_data = pcm->private_data; 921 substream->ref_count = 1; 922 substream->f_flags = file->f_flags; 923 substream->pid = get_pid(task_pid(current)); 924 pstr->substream_opened++; 925 *rsubstream = substream; 926 return 0; 927} 928 929void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 930{ 931 struct snd_pcm_runtime *runtime; 932 933 if (PCM_RUNTIME_CHECK(substream)) 934 return; 935 runtime = substream->runtime; 936 if (runtime->private_free != NULL) 937 runtime->private_free(runtime); 938 snd_free_pages((void*)runtime->status, 939 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 940 snd_free_pages((void*)runtime->control, 941 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 942 kfree(runtime->hw_constraints.rules); 943#ifdef CONFIG_SND_PCM_XRUN_DEBUG 944 if (runtime->hwptr_log) 945 kfree(runtime->hwptr_log); 946#endif 947 kfree(runtime); 948 substream->runtime = NULL; 949 put_pid(substream->pid); 950 substream->pid = NULL; 951 substream->pstr->substream_opened--; 952} 953 954static ssize_t show_pcm_class(struct device *dev, 955 struct device_attribute *attr, char *buf) 956{ 957 struct snd_pcm *pcm; 958 const char *str; 959 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 960 [SNDRV_PCM_CLASS_GENERIC] = "generic", 961 [SNDRV_PCM_CLASS_MULTI] = "multi", 962 [SNDRV_PCM_CLASS_MODEM] = "modem", 963 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 964 }; 965 966 if (! (pcm = dev_get_drvdata(dev)) || 967 pcm->dev_class > SNDRV_PCM_CLASS_LAST) 968 str = "none"; 969 else 970 str = strs[pcm->dev_class]; 971 return snprintf(buf, PAGE_SIZE, "%s\n", str); 972} 973 974static struct device_attribute pcm_attrs = 975 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); 976 977static int snd_pcm_dev_register(struct snd_device *device) 978{ 979 int cidx, err; 980 struct snd_pcm_substream *substream; 981 struct snd_pcm_notify *notify; 982 char str[16]; 983 struct snd_pcm *pcm; 984 struct device *dev; 985 986 if (snd_BUG_ON(!device || !device->device_data)) 987 return -ENXIO; 988 pcm = device->device_data; 989 mutex_lock(®ister_mutex); 990 err = snd_pcm_add(pcm); 991 if (err) { 992 mutex_unlock(®ister_mutex); 993 return err; 994 } 995 for (cidx = 0; cidx < 2; cidx++) { 996 int devtype = -1; 997 if (pcm->streams[cidx].substream == NULL) 998 continue; 999 switch (cidx) { 1000 case SNDRV_PCM_STREAM_PLAYBACK: 1001 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 1002 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1003 break; 1004 case SNDRV_PCM_STREAM_CAPTURE: 1005 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 1006 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1007 break; 1008 } 1009 /* device pointer to use, pcm->dev takes precedence if 1010 * it is assigned, otherwise fall back to card's device 1011 * if possible */ 1012 dev = pcm->dev; 1013 if (!dev) 1014 dev = snd_card_get_device_link(pcm->card); 1015 /* register pcm */ 1016 err = snd_register_device_for_dev(devtype, pcm->card, 1017 pcm->device, 1018 &snd_pcm_f_ops[cidx], 1019 pcm, str, dev); 1020 if (err < 0) { 1021 list_del(&pcm->list); 1022 mutex_unlock(®ister_mutex); 1023 return err; 1024 } 1025 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device, 1026 &pcm_attrs); 1027 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1028 snd_pcm_timer_init(substream); 1029 } 1030 1031 list_for_each_entry(notify, &snd_pcm_notify_list, list) 1032 notify->n_register(pcm); 1033 1034 mutex_unlock(®ister_mutex); 1035 return 0; 1036} 1037 1038static int snd_pcm_dev_disconnect(struct snd_device *device) 1039{ 1040 struct snd_pcm *pcm = device->device_data; 1041 struct snd_pcm_notify *notify; 1042 struct snd_pcm_substream *substream; 1043 int cidx, devtype; 1044 1045 mutex_lock(®ister_mutex); 1046 if (list_empty(&pcm->list)) 1047 goto unlock; 1048 1049 list_del_init(&pcm->list); 1050 for (cidx = 0; cidx < 2; cidx++) 1051 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1052 if (substream->runtime) 1053 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1054 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 1055 notify->n_disconnect(pcm); 1056 } 1057 for (cidx = 0; cidx < 2; cidx++) { 1058 devtype = -1; 1059 switch (cidx) { 1060 case SNDRV_PCM_STREAM_PLAYBACK: 1061 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1062 break; 1063 case SNDRV_PCM_STREAM_CAPTURE: 1064 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1065 break; 1066 } 1067 snd_unregister_device(devtype, pcm->card, pcm->device); 1068 } 1069 unlock: 1070 mutex_unlock(®ister_mutex); 1071 return 0; 1072} 1073 1074int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1075{ 1076 struct snd_pcm *pcm; 1077 1078 if (snd_BUG_ON(!notify || 1079 !notify->n_register || 1080 !notify->n_unregister || 1081 !notify->n_disconnect)) 1082 return -EINVAL; 1083 mutex_lock(®ister_mutex); 1084 if (nfree) { 1085 list_del(¬ify->list); 1086 list_for_each_entry(pcm, &snd_pcm_devices, list) 1087 notify->n_unregister(pcm); 1088 } else { 1089 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1090 list_for_each_entry(pcm, &snd_pcm_devices, list) 1091 notify->n_register(pcm); 1092 } 1093 mutex_unlock(®ister_mutex); 1094 return 0; 1095} 1096 1097EXPORT_SYMBOL(snd_pcm_notify); 1098 1099#ifdef CONFIG_PROC_FS 1100/* 1101 * Info interface 1102 */ 1103 1104static void snd_pcm_proc_read(struct snd_info_entry *entry, 1105 struct snd_info_buffer *buffer) 1106{ 1107 struct snd_pcm *pcm; 1108 1109 mutex_lock(®ister_mutex); 1110 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1111 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1112 pcm->card->number, pcm->device, pcm->id, pcm->name); 1113 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1114 snd_iprintf(buffer, " : playback %i", 1115 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1116 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1117 snd_iprintf(buffer, " : capture %i", 1118 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1119 snd_iprintf(buffer, "\n"); 1120 } 1121 mutex_unlock(®ister_mutex); 1122} 1123 1124static struct snd_info_entry *snd_pcm_proc_entry; 1125 1126static void snd_pcm_proc_init(void) 1127{ 1128 struct snd_info_entry *entry; 1129 1130 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1131 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1132 if (snd_info_register(entry) < 0) { 1133 snd_info_free_entry(entry); 1134 entry = NULL; 1135 } 1136 } 1137 snd_pcm_proc_entry = entry; 1138} 1139 1140static void snd_pcm_proc_done(void) 1141{ 1142 snd_info_free_entry(snd_pcm_proc_entry); 1143} 1144 1145#else /* !CONFIG_PROC_FS */ 1146#define snd_pcm_proc_init() 1147#define snd_pcm_proc_done() 1148#endif /* CONFIG_PROC_FS */ 1149 1150 1151/* 1152 * ENTRY functions 1153 */ 1154 1155static int __init alsa_pcm_init(void) 1156{ 1157 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1158 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1159 snd_pcm_proc_init(); 1160 return 0; 1161} 1162 1163static void __exit alsa_pcm_exit(void) 1164{ 1165 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1166 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1167 snd_pcm_proc_done(); 1168} 1169 1170module_init(alsa_pcm_init) 1171module_exit(alsa_pcm_exit) 1172