pcm.c revision 7eaa943c8ed8e91e05d0f5d0dc7a18e3319b45cf
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#ifdef CONFIG_SND_VERBOSE_PROCFS 166 167#define STATE(v) [SNDRV_PCM_STATE_##v] = #v 168#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 169#define READY(v) [SNDRV_PCM_READY_##v] = #v 170#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 171#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 172#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 173#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 174#define START(v) [SNDRV_PCM_START_##v] = #v 175#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 176#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 177 178static char *snd_pcm_format_names[] = { 179 FORMAT(S8), 180 FORMAT(U8), 181 FORMAT(S16_LE), 182 FORMAT(S16_BE), 183 FORMAT(U16_LE), 184 FORMAT(U16_BE), 185 FORMAT(S24_LE), 186 FORMAT(S24_BE), 187 FORMAT(U24_LE), 188 FORMAT(U24_BE), 189 FORMAT(S32_LE), 190 FORMAT(S32_BE), 191 FORMAT(U32_LE), 192 FORMAT(U32_BE), 193 FORMAT(FLOAT_LE), 194 FORMAT(FLOAT_BE), 195 FORMAT(FLOAT64_LE), 196 FORMAT(FLOAT64_BE), 197 FORMAT(IEC958_SUBFRAME_LE), 198 FORMAT(IEC958_SUBFRAME_BE), 199 FORMAT(MU_LAW), 200 FORMAT(A_LAW), 201 FORMAT(IMA_ADPCM), 202 FORMAT(MPEG), 203 FORMAT(GSM), 204 FORMAT(SPECIAL), 205 FORMAT(S24_3LE), 206 FORMAT(S24_3BE), 207 FORMAT(U24_3LE), 208 FORMAT(U24_3BE), 209 FORMAT(S20_3LE), 210 FORMAT(S20_3BE), 211 FORMAT(U20_3LE), 212 FORMAT(U20_3BE), 213 FORMAT(S18_3LE), 214 FORMAT(S18_3BE), 215 FORMAT(U18_3LE), 216 FORMAT(U18_3BE), 217}; 218 219static const char *snd_pcm_format_name(snd_pcm_format_t format) 220{ 221 return snd_pcm_format_names[format]; 222} 223 224static char *snd_pcm_stream_names[] = { 225 STREAM(PLAYBACK), 226 STREAM(CAPTURE), 227}; 228 229static char *snd_pcm_state_names[] = { 230 STATE(OPEN), 231 STATE(SETUP), 232 STATE(PREPARED), 233 STATE(RUNNING), 234 STATE(XRUN), 235 STATE(DRAINING), 236 STATE(PAUSED), 237 STATE(SUSPENDED), 238}; 239 240static char *snd_pcm_access_names[] = { 241 ACCESS(MMAP_INTERLEAVED), 242 ACCESS(MMAP_NONINTERLEAVED), 243 ACCESS(MMAP_COMPLEX), 244 ACCESS(RW_INTERLEAVED), 245 ACCESS(RW_NONINTERLEAVED), 246}; 247 248static char *snd_pcm_subformat_names[] = { 249 SUBFORMAT(STD), 250}; 251 252static char *snd_pcm_tstamp_mode_names[] = { 253 TSTAMP(NONE), 254 TSTAMP(ENABLE), 255}; 256 257static const char *snd_pcm_stream_name(int stream) 258{ 259 return snd_pcm_stream_names[stream]; 260} 261 262static const char *snd_pcm_access_name(snd_pcm_access_t access) 263{ 264 return snd_pcm_access_names[access]; 265} 266 267static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 268{ 269 return snd_pcm_subformat_names[subformat]; 270} 271 272static const char *snd_pcm_tstamp_mode_name(int mode) 273{ 274 return snd_pcm_tstamp_mode_names[mode]; 275} 276 277static const char *snd_pcm_state_name(snd_pcm_state_t state) 278{ 279 return snd_pcm_state_names[state]; 280} 281 282#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 283#include <linux/soundcard.h> 284 285static const char *snd_pcm_oss_format_name(int format) 286{ 287 switch (format) { 288 case AFMT_MU_LAW: 289 return "MU_LAW"; 290 case AFMT_A_LAW: 291 return "A_LAW"; 292 case AFMT_IMA_ADPCM: 293 return "IMA_ADPCM"; 294 case AFMT_U8: 295 return "U8"; 296 case AFMT_S16_LE: 297 return "S16_LE"; 298 case AFMT_S16_BE: 299 return "S16_BE"; 300 case AFMT_S8: 301 return "S8"; 302 case AFMT_U16_LE: 303 return "U16_LE"; 304 case AFMT_U16_BE: 305 return "U16_BE"; 306 case AFMT_MPEG: 307 return "MPEG"; 308 default: 309 return "unknown"; 310 } 311} 312#endif 313 314static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 315 struct snd_info_buffer *buffer) 316{ 317 struct snd_pcm_info *info; 318 int err; 319 320 if (! substream) 321 return; 322 323 info = kmalloc(sizeof(*info), GFP_KERNEL); 324 if (! info) { 325 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 326 return; 327 } 328 329 err = snd_pcm_info(substream, info); 330 if (err < 0) { 331 snd_iprintf(buffer, "error %d\n", err); 332 kfree(info); 333 return; 334 } 335 snd_iprintf(buffer, "card: %d\n", info->card); 336 snd_iprintf(buffer, "device: %d\n", info->device); 337 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 338 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 339 snd_iprintf(buffer, "id: %s\n", info->id); 340 snd_iprintf(buffer, "name: %s\n", info->name); 341 snd_iprintf(buffer, "subname: %s\n", info->subname); 342 snd_iprintf(buffer, "class: %d\n", info->dev_class); 343 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 344 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 345 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 346 kfree(info); 347} 348 349static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 350 struct snd_info_buffer *buffer) 351{ 352 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 353 buffer); 354} 355 356static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 357 struct snd_info_buffer *buffer) 358{ 359 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data, 360 buffer); 361} 362 363static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 364 struct snd_info_buffer *buffer) 365{ 366 struct snd_pcm_substream *substream = entry->private_data; 367 struct snd_pcm_runtime *runtime = substream->runtime; 368 if (!runtime) { 369 snd_iprintf(buffer, "closed\n"); 370 return; 371 } 372 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 373 snd_iprintf(buffer, "no setup\n"); 374 return; 375 } 376 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 377 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 378 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 379 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 380 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 381 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 382 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 383#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 384 if (substream->oss.oss) { 385 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 386 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 387 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 388 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 389 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 390 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 391 } 392#endif 393} 394 395static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 396 struct snd_info_buffer *buffer) 397{ 398 struct snd_pcm_substream *substream = entry->private_data; 399 struct snd_pcm_runtime *runtime = substream->runtime; 400 if (!runtime) { 401 snd_iprintf(buffer, "closed\n"); 402 return; 403 } 404 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 405 snd_iprintf(buffer, "no setup\n"); 406 return; 407 } 408 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 409 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 410 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 411 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 412 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 413 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 414 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 415 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 416} 417 418static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 419 struct snd_info_buffer *buffer) 420{ 421 struct snd_pcm_substream *substream = entry->private_data; 422 struct snd_pcm_runtime *runtime = substream->runtime; 423 struct snd_pcm_status status; 424 int err; 425 if (!runtime) { 426 snd_iprintf(buffer, "closed\n"); 427 return; 428 } 429 memset(&status, 0, sizeof(status)); 430 err = snd_pcm_status(substream, &status); 431 if (err < 0) { 432 snd_iprintf(buffer, "error %d\n", err); 433 return; 434 } 435 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 436 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 437 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 438 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 439 status.tstamp.tv_sec, status.tstamp.tv_nsec); 440 snd_iprintf(buffer, "delay : %ld\n", status.delay); 441 snd_iprintf(buffer, "avail : %ld\n", status.avail); 442 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 443 snd_iprintf(buffer, "-----\n"); 444 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 445 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 446} 447 448#ifdef CONFIG_SND_PCM_XRUN_DEBUG 449static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 450 struct snd_info_buffer *buffer) 451{ 452 struct snd_pcm_str *pstr = entry->private_data; 453 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 454} 455 456static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 457 struct snd_info_buffer *buffer) 458{ 459 struct snd_pcm_str *pstr = entry->private_data; 460 char line[64]; 461 if (!snd_info_get_line(buffer, line, sizeof(line))) 462 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 463} 464#endif 465 466static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 467{ 468 struct snd_pcm *pcm = pstr->pcm; 469 struct snd_info_entry *entry; 470 char name[16]; 471 472 sprintf(name, "pcm%i%c", pcm->device, 473 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 474 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 475 return -ENOMEM; 476 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 477 if (snd_info_register(entry) < 0) { 478 snd_info_free_entry(entry); 479 return -ENOMEM; 480 } 481 pstr->proc_root = entry; 482 483 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 484 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); 485 if (snd_info_register(entry) < 0) { 486 snd_info_free_entry(entry); 487 entry = NULL; 488 } 489 } 490 pstr->proc_info_entry = entry; 491 492#ifdef CONFIG_SND_PCM_XRUN_DEBUG 493 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 494 pstr->proc_root)) != NULL) { 495 entry->c.text.read = snd_pcm_xrun_debug_read; 496 entry->c.text.write = snd_pcm_xrun_debug_write; 497 entry->mode |= S_IWUSR; 498 entry->private_data = pstr; 499 if (snd_info_register(entry) < 0) { 500 snd_info_free_entry(entry); 501 entry = NULL; 502 } 503 } 504 pstr->proc_xrun_debug_entry = entry; 505#endif 506 return 0; 507} 508 509static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 510{ 511#ifdef CONFIG_SND_PCM_XRUN_DEBUG 512 snd_info_free_entry(pstr->proc_xrun_debug_entry); 513 pstr->proc_xrun_debug_entry = NULL; 514#endif 515 snd_info_free_entry(pstr->proc_info_entry); 516 pstr->proc_info_entry = NULL; 517 snd_info_free_entry(pstr->proc_root); 518 pstr->proc_root = NULL; 519 return 0; 520} 521 522static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 523{ 524 struct snd_info_entry *entry; 525 struct snd_card *card; 526 char name[16]; 527 528 card = substream->pcm->card; 529 530 sprintf(name, "sub%i", substream->number); 531 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 532 return -ENOMEM; 533 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 534 if (snd_info_register(entry) < 0) { 535 snd_info_free_entry(entry); 536 return -ENOMEM; 537 } 538 substream->proc_root = entry; 539 540 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 541 snd_info_set_text_ops(entry, substream, 542 snd_pcm_substream_proc_info_read); 543 if (snd_info_register(entry) < 0) { 544 snd_info_free_entry(entry); 545 entry = NULL; 546 } 547 } 548 substream->proc_info_entry = entry; 549 550 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 551 snd_info_set_text_ops(entry, substream, 552 snd_pcm_substream_proc_hw_params_read); 553 if (snd_info_register(entry) < 0) { 554 snd_info_free_entry(entry); 555 entry = NULL; 556 } 557 } 558 substream->proc_hw_params_entry = entry; 559 560 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 561 snd_info_set_text_ops(entry, substream, 562 snd_pcm_substream_proc_sw_params_read); 563 if (snd_info_register(entry) < 0) { 564 snd_info_free_entry(entry); 565 entry = NULL; 566 } 567 } 568 substream->proc_sw_params_entry = entry; 569 570 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 571 snd_info_set_text_ops(entry, substream, 572 snd_pcm_substream_proc_status_read); 573 if (snd_info_register(entry) < 0) { 574 snd_info_free_entry(entry); 575 entry = NULL; 576 } 577 } 578 substream->proc_status_entry = entry; 579 580 return 0; 581} 582 583static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 584{ 585 snd_info_free_entry(substream->proc_info_entry); 586 substream->proc_info_entry = NULL; 587 snd_info_free_entry(substream->proc_hw_params_entry); 588 substream->proc_hw_params_entry = NULL; 589 snd_info_free_entry(substream->proc_sw_params_entry); 590 substream->proc_sw_params_entry = NULL; 591 snd_info_free_entry(substream->proc_status_entry); 592 substream->proc_status_entry = NULL; 593 snd_info_free_entry(substream->proc_root); 594 substream->proc_root = NULL; 595 return 0; 596} 597#else /* !CONFIG_SND_VERBOSE_PROCFS */ 598static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 599static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 600static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 601static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 602#endif /* CONFIG_SND_VERBOSE_PROCFS */ 603 604/** 605 * snd_pcm_new_stream - create a new PCM stream 606 * @pcm: the pcm instance 607 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 608 * @substream_count: the number of substreams 609 * 610 * Creates a new stream for the pcm. 611 * The corresponding stream on the pcm must have been empty before 612 * calling this, i.e. zero must be given to the argument of 613 * snd_pcm_new(). 614 * 615 * Returns zero if successful, or a negative error code on failure. 616 */ 617int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 618{ 619 int idx, err; 620 struct snd_pcm_str *pstr = &pcm->streams[stream]; 621 struct snd_pcm_substream *substream, *prev; 622 623#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 624 mutex_init(&pstr->oss.setup_mutex); 625#endif 626 pstr->stream = stream; 627 pstr->pcm = pcm; 628 pstr->substream_count = substream_count; 629 if (substream_count > 0) { 630 err = snd_pcm_stream_proc_init(pstr); 631 if (err < 0) { 632 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 633 return err; 634 } 635 } 636 prev = NULL; 637 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 638 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 639 if (substream == NULL) { 640 snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); 641 return -ENOMEM; 642 } 643 substream->pcm = pcm; 644 substream->pstr = pstr; 645 substream->number = idx; 646 substream->stream = stream; 647 sprintf(substream->name, "subdevice #%i", idx); 648 snprintf(substream->latency_id, sizeof(substream->latency_id), 649 "ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device, 650 (stream ? 'c' : 'p'), idx); 651 substream->buffer_bytes_max = UINT_MAX; 652 if (prev == NULL) 653 pstr->substream = substream; 654 else 655 prev->next = substream; 656 err = snd_pcm_substream_proc_init(substream); 657 if (err < 0) { 658 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 659 if (prev == NULL) 660 pstr->substream = NULL; 661 else 662 prev->next = NULL; 663 kfree(substream); 664 return err; 665 } 666 substream->group = &substream->self_group; 667 spin_lock_init(&substream->self_group.lock); 668 INIT_LIST_HEAD(&substream->self_group.substreams); 669 list_add_tail(&substream->link_list, &substream->self_group.substreams); 670 spin_lock_init(&substream->timer_lock); 671 atomic_set(&substream->mmap_count, 0); 672 prev = substream; 673 } 674 return 0; 675} 676 677EXPORT_SYMBOL(snd_pcm_new_stream); 678 679/** 680 * snd_pcm_new - create a new PCM instance 681 * @card: the card instance 682 * @id: the id string 683 * @device: the device index (zero based) 684 * @playback_count: the number of substreams for playback 685 * @capture_count: the number of substreams for capture 686 * @rpcm: the pointer to store the new pcm instance 687 * 688 * Creates a new PCM instance. 689 * 690 * The pcm operators have to be set afterwards to the new instance 691 * via snd_pcm_set_ops(). 692 * 693 * Returns zero if successful, or a negative error code on failure. 694 */ 695int snd_pcm_new(struct snd_card *card, char *id, int device, 696 int playback_count, int capture_count, 697 struct snd_pcm ** rpcm) 698{ 699 struct snd_pcm *pcm; 700 int err; 701 static struct snd_device_ops ops = { 702 .dev_free = snd_pcm_dev_free, 703 .dev_register = snd_pcm_dev_register, 704 .dev_disconnect = snd_pcm_dev_disconnect, 705 }; 706 707 if (snd_BUG_ON(!card)) 708 return -ENXIO; 709 if (rpcm) 710 *rpcm = NULL; 711 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 712 if (pcm == NULL) { 713 snd_printk(KERN_ERR "Cannot allocate PCM\n"); 714 return -ENOMEM; 715 } 716 pcm->card = card; 717 pcm->device = device; 718 if (id) 719 strlcpy(pcm->id, id, sizeof(pcm->id)); 720 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 721 snd_pcm_free(pcm); 722 return err; 723 } 724 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 725 snd_pcm_free(pcm); 726 return err; 727 } 728 mutex_init(&pcm->open_mutex); 729 init_waitqueue_head(&pcm->open_wait); 730 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 731 snd_pcm_free(pcm); 732 return err; 733 } 734 if (rpcm) 735 *rpcm = pcm; 736 return 0; 737} 738 739EXPORT_SYMBOL(snd_pcm_new); 740 741static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 742{ 743 struct snd_pcm_substream *substream, *substream_next; 744#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 745 struct snd_pcm_oss_setup *setup, *setupn; 746#endif 747 substream = pstr->substream; 748 while (substream) { 749 substream_next = substream->next; 750 snd_pcm_timer_done(substream); 751 snd_pcm_substream_proc_done(substream); 752 kfree(substream); 753 substream = substream_next; 754 } 755 snd_pcm_stream_proc_done(pstr); 756#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 757 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 758 setupn = setup->next; 759 kfree(setup->task_name); 760 kfree(setup); 761 } 762#endif 763} 764 765static int snd_pcm_free(struct snd_pcm *pcm) 766{ 767 struct snd_pcm_notify *notify; 768 769 if (!pcm) 770 return 0; 771 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 772 notify->n_unregister(pcm); 773 } 774 if (pcm->private_free) 775 pcm->private_free(pcm); 776 snd_pcm_lib_preallocate_free_for_all(pcm); 777 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 778 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 779 kfree(pcm); 780 return 0; 781} 782 783static int snd_pcm_dev_free(struct snd_device *device) 784{ 785 struct snd_pcm *pcm = device->device_data; 786 return snd_pcm_free(pcm); 787} 788 789int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 790 struct file *file, 791 struct snd_pcm_substream **rsubstream) 792{ 793 struct snd_pcm_str * pstr; 794 struct snd_pcm_substream *substream; 795 struct snd_pcm_runtime *runtime; 796 struct snd_ctl_file *kctl; 797 struct snd_card *card; 798 int prefer_subdevice = -1; 799 size_t size; 800 801 if (snd_BUG_ON(!pcm || !rsubstream)) 802 return -ENXIO; 803 *rsubstream = NULL; 804 pstr = &pcm->streams[stream]; 805 if (pstr->substream == NULL || pstr->substream_count == 0) 806 return -ENODEV; 807 808 card = pcm->card; 809 read_lock(&card->ctl_files_rwlock); 810 list_for_each_entry(kctl, &card->ctl_files, list) { 811 if (kctl->pid == current->pid) { 812 prefer_subdevice = kctl->prefer_pcm_subdevice; 813 if (prefer_subdevice != -1) 814 break; 815 } 816 } 817 read_unlock(&card->ctl_files_rwlock); 818 819 switch (stream) { 820 case SNDRV_PCM_STREAM_PLAYBACK: 821 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 822 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 823 if (SUBSTREAM_BUSY(substream)) 824 return -EAGAIN; 825 } 826 } 827 break; 828 case SNDRV_PCM_STREAM_CAPTURE: 829 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 830 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 831 if (SUBSTREAM_BUSY(substream)) 832 return -EAGAIN; 833 } 834 } 835 break; 836 default: 837 return -EINVAL; 838 } 839 840 if (file->f_flags & O_APPEND) { 841 if (prefer_subdevice < 0) { 842 if (pstr->substream_count > 1) 843 return -EINVAL; /* must be unique */ 844 substream = pstr->substream; 845 } else { 846 for (substream = pstr->substream; substream; 847 substream = substream->next) 848 if (substream->number == prefer_subdevice) 849 break; 850 } 851 if (! substream) 852 return -ENODEV; 853 if (! SUBSTREAM_BUSY(substream)) 854 return -EBADFD; 855 substream->ref_count++; 856 *rsubstream = substream; 857 return 0; 858 } 859 860 if (prefer_subdevice >= 0) { 861 for (substream = pstr->substream; substream; substream = substream->next) 862 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 863 goto __ok; 864 } 865 for (substream = pstr->substream; substream; substream = substream->next) 866 if (!SUBSTREAM_BUSY(substream)) 867 break; 868 __ok: 869 if (substream == NULL) 870 return -EAGAIN; 871 872 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 873 if (runtime == NULL) 874 return -ENOMEM; 875 876 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 877 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 878 if (runtime->status == NULL) { 879 kfree(runtime); 880 return -ENOMEM; 881 } 882 memset((void*)runtime->status, 0, size); 883 884 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 885 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 886 if (runtime->control == NULL) { 887 snd_free_pages((void*)runtime->status, 888 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 889 kfree(runtime); 890 return -ENOMEM; 891 } 892 memset((void*)runtime->control, 0, size); 893 894 init_waitqueue_head(&runtime->sleep); 895 896 runtime->status->state = SNDRV_PCM_STATE_OPEN; 897 898 substream->runtime = runtime; 899 substream->private_data = pcm->private_data; 900 substream->ref_count = 1; 901 substream->f_flags = file->f_flags; 902 pstr->substream_opened++; 903 *rsubstream = substream; 904 return 0; 905} 906 907void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 908{ 909 struct snd_pcm_runtime *runtime; 910 911 if (PCM_RUNTIME_CHECK(substream)) 912 return; 913 runtime = substream->runtime; 914 if (runtime->private_free != NULL) 915 runtime->private_free(runtime); 916 snd_free_pages((void*)runtime->status, 917 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 918 snd_free_pages((void*)runtime->control, 919 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 920 kfree(runtime->hw_constraints.rules); 921 kfree(runtime); 922 substream->runtime = NULL; 923 substream->pstr->substream_opened--; 924} 925 926static ssize_t show_pcm_class(struct device *dev, 927 struct device_attribute *attr, char *buf) 928{ 929 struct snd_pcm *pcm; 930 const char *str; 931 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 932 [SNDRV_PCM_CLASS_GENERIC] = "generic", 933 [SNDRV_PCM_CLASS_MULTI] = "multi", 934 [SNDRV_PCM_CLASS_MODEM] = "modem", 935 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 936 }; 937 938 if (! (pcm = dev_get_drvdata(dev)) || 939 pcm->dev_class > SNDRV_PCM_CLASS_LAST) 940 str = "none"; 941 else 942 str = strs[pcm->dev_class]; 943 return snprintf(buf, PAGE_SIZE, "%s\n", str); 944} 945 946static struct device_attribute pcm_attrs = 947 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); 948 949static int snd_pcm_dev_register(struct snd_device *device) 950{ 951 int cidx, err; 952 struct snd_pcm_substream *substream; 953 struct snd_pcm_notify *notify; 954 char str[16]; 955 struct snd_pcm *pcm = device->device_data; 956 struct device *dev; 957 958 if (snd_BUG_ON(!pcm || !device)) 959 return -ENXIO; 960 mutex_lock(®ister_mutex); 961 err = snd_pcm_add(pcm); 962 if (err) { 963 mutex_unlock(®ister_mutex); 964 return err; 965 } 966 for (cidx = 0; cidx < 2; cidx++) { 967 int devtype = -1; 968 if (pcm->streams[cidx].substream == NULL) 969 continue; 970 switch (cidx) { 971 case SNDRV_PCM_STREAM_PLAYBACK: 972 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 973 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 974 break; 975 case SNDRV_PCM_STREAM_CAPTURE: 976 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 977 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 978 break; 979 } 980 /* device pointer to use, pcm->dev takes precedence if 981 * it is assigned, otherwise fall back to card's device 982 * if possible */ 983 dev = pcm->dev; 984 if (!dev) 985 dev = snd_card_get_device_link(pcm->card); 986 /* register pcm */ 987 err = snd_register_device_for_dev(devtype, pcm->card, 988 pcm->device, 989 &snd_pcm_f_ops[cidx], 990 pcm, str, dev); 991 if (err < 0) { 992 list_del(&pcm->list); 993 mutex_unlock(®ister_mutex); 994 return err; 995 } 996 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device, 997 &pcm_attrs); 998 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 999 snd_pcm_timer_init(substream); 1000 } 1001 1002 list_for_each_entry(notify, &snd_pcm_notify_list, list) 1003 notify->n_register(pcm); 1004 1005 mutex_unlock(®ister_mutex); 1006 return 0; 1007} 1008 1009static int snd_pcm_dev_disconnect(struct snd_device *device) 1010{ 1011 struct snd_pcm *pcm = device->device_data; 1012 struct snd_pcm_notify *notify; 1013 struct snd_pcm_substream *substream; 1014 int cidx, devtype; 1015 1016 mutex_lock(®ister_mutex); 1017 if (list_empty(&pcm->list)) 1018 goto unlock; 1019 1020 list_del_init(&pcm->list); 1021 for (cidx = 0; cidx < 2; cidx++) 1022 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1023 if (substream->runtime) 1024 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1025 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 1026 notify->n_disconnect(pcm); 1027 } 1028 for (cidx = 0; cidx < 2; cidx++) { 1029 devtype = -1; 1030 switch (cidx) { 1031 case SNDRV_PCM_STREAM_PLAYBACK: 1032 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1033 break; 1034 case SNDRV_PCM_STREAM_CAPTURE: 1035 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1036 break; 1037 } 1038 snd_unregister_device(devtype, pcm->card, pcm->device); 1039 } 1040 unlock: 1041 mutex_unlock(®ister_mutex); 1042 return 0; 1043} 1044 1045int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1046{ 1047 struct snd_pcm *pcm; 1048 1049 if (snd_BUG_ON(!notify || 1050 !notify->n_register || 1051 !notify->n_unregister || 1052 !notify->n_disconnect)) 1053 return -EINVAL; 1054 mutex_lock(®ister_mutex); 1055 if (nfree) { 1056 list_del(¬ify->list); 1057 list_for_each_entry(pcm, &snd_pcm_devices, list) 1058 notify->n_unregister(pcm); 1059 } else { 1060 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1061 list_for_each_entry(pcm, &snd_pcm_devices, list) 1062 notify->n_register(pcm); 1063 } 1064 mutex_unlock(®ister_mutex); 1065 return 0; 1066} 1067 1068EXPORT_SYMBOL(snd_pcm_notify); 1069 1070#ifdef CONFIG_PROC_FS 1071/* 1072 * Info interface 1073 */ 1074 1075static void snd_pcm_proc_read(struct snd_info_entry *entry, 1076 struct snd_info_buffer *buffer) 1077{ 1078 struct snd_pcm *pcm; 1079 1080 mutex_lock(®ister_mutex); 1081 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1082 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1083 pcm->card->number, pcm->device, pcm->id, pcm->name); 1084 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1085 snd_iprintf(buffer, " : playback %i", 1086 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1087 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1088 snd_iprintf(buffer, " : capture %i", 1089 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1090 snd_iprintf(buffer, "\n"); 1091 } 1092 mutex_unlock(®ister_mutex); 1093} 1094 1095static struct snd_info_entry *snd_pcm_proc_entry; 1096 1097static void snd_pcm_proc_init(void) 1098{ 1099 struct snd_info_entry *entry; 1100 1101 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1102 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1103 if (snd_info_register(entry) < 0) { 1104 snd_info_free_entry(entry); 1105 entry = NULL; 1106 } 1107 } 1108 snd_pcm_proc_entry = entry; 1109} 1110 1111static void snd_pcm_proc_done(void) 1112{ 1113 snd_info_free_entry(snd_pcm_proc_entry); 1114} 1115 1116#else /* !CONFIG_PROC_FS */ 1117#define snd_pcm_proc_init() 1118#define snd_pcm_proc_done() 1119#endif /* CONFIG_PROC_FS */ 1120 1121 1122/* 1123 * ENTRY functions 1124 */ 1125 1126static int __init alsa_pcm_init(void) 1127{ 1128 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1129 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1130 snd_pcm_proc_init(); 1131 return 0; 1132} 1133 1134static void __exit alsa_pcm_exit(void) 1135{ 1136 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1137 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1138 snd_pcm_proc_done(); 1139} 1140 1141module_init(alsa_pcm_init) 1142module_exit(alsa_pcm_exit) 1143