pcm.c revision 877211f5e1b1196179ba1290e8e1a3dc00427c55
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 <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@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 33MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 34MODULE_LICENSE("GPL"); 35 36struct snd_pcm *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES]; 37static LIST_HEAD(snd_pcm_notify_list); 38static DECLARE_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); 44static int snd_pcm_dev_unregister(struct snd_device *device); 45 46static int snd_pcm_control_ioctl(struct snd_card *card, 47 struct snd_ctl_file *control, 48 unsigned int cmd, unsigned long arg) 49{ 50 unsigned int tmp; 51 52 tmp = card->number * SNDRV_PCM_DEVICES; 53 switch (cmd) { 54 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 55 { 56 int device; 57 58 if (get_user(device, (int __user *)arg)) 59 return -EFAULT; 60 device = device < 0 ? 0 : device + 1; 61 while (device < SNDRV_PCM_DEVICES) { 62 if (snd_pcm_devices[tmp + device]) 63 break; 64 device++; 65 } 66 if (device == SNDRV_PCM_DEVICES) 67 device = -1; 68 if (put_user(device, (int __user *)arg)) 69 return -EFAULT; 70 return 0; 71 } 72 case SNDRV_CTL_IOCTL_PCM_INFO: 73 { 74 struct snd_pcm_info __user *info; 75 unsigned int device, subdevice; 76 int stream; 77 struct snd_pcm *pcm; 78 struct snd_pcm_str *pstr; 79 struct snd_pcm_substream *substream; 80 info = (struct snd_pcm_info __user *)arg; 81 if (get_user(device, &info->device)) 82 return -EFAULT; 83 if (device >= SNDRV_PCM_DEVICES) 84 return -ENXIO; 85 pcm = snd_pcm_devices[tmp + device]; 86 if (pcm == NULL) 87 return -ENXIO; 88 if (get_user(stream, &info->stream)) 89 return -EFAULT; 90 if (stream < 0 || stream > 1) 91 return -EINVAL; 92 pstr = &pcm->streams[stream]; 93 if (pstr->substream_count == 0) 94 return -ENOENT; 95 if (get_user(subdevice, &info->subdevice)) 96 return -EFAULT; 97 if (subdevice >= pstr->substream_count) 98 return -ENXIO; 99 for (substream = pstr->substream; substream; substream = substream->next) 100 if (substream->number == (int)subdevice) 101 break; 102 if (substream == NULL) 103 return -ENXIO; 104 return snd_pcm_info_user(substream, info); 105 } 106 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 107 { 108 int val; 109 110 if (get_user(val, (int __user *)arg)) 111 return -EFAULT; 112 control->prefer_pcm_subdevice = val; 113 return 0; 114 } 115 } 116 return -ENOIOCTLCMD; 117} 118#define STATE(v) [SNDRV_PCM_STATE_##v] = #v 119#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 120#define READY(v) [SNDRV_PCM_READY_##v] = #v 121#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 122#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 123#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 124#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 125#define START(v) [SNDRV_PCM_START_##v] = #v 126#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 127#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 128 129static char *snd_pcm_stream_names[] = { 130 STREAM(PLAYBACK), 131 STREAM(CAPTURE), 132}; 133 134static char *snd_pcm_state_names[] = { 135 STATE(OPEN), 136 STATE(SETUP), 137 STATE(PREPARED), 138 STATE(RUNNING), 139 STATE(XRUN), 140 STATE(DRAINING), 141 STATE(PAUSED), 142 STATE(SUSPENDED), 143}; 144 145static char *snd_pcm_access_names[] = { 146 ACCESS(MMAP_INTERLEAVED), 147 ACCESS(MMAP_NONINTERLEAVED), 148 ACCESS(MMAP_COMPLEX), 149 ACCESS(RW_INTERLEAVED), 150 ACCESS(RW_NONINTERLEAVED), 151}; 152 153static char *snd_pcm_format_names[] = { 154 FORMAT(S8), 155 FORMAT(U8), 156 FORMAT(S16_LE), 157 FORMAT(S16_BE), 158 FORMAT(U16_LE), 159 FORMAT(U16_BE), 160 FORMAT(S24_LE), 161 FORMAT(S24_BE), 162 FORMAT(U24_LE), 163 FORMAT(U24_BE), 164 FORMAT(S32_LE), 165 FORMAT(S32_BE), 166 FORMAT(U32_LE), 167 FORMAT(U32_BE), 168 FORMAT(FLOAT_LE), 169 FORMAT(FLOAT_BE), 170 FORMAT(FLOAT64_LE), 171 FORMAT(FLOAT64_BE), 172 FORMAT(IEC958_SUBFRAME_LE), 173 FORMAT(IEC958_SUBFRAME_BE), 174 FORMAT(MU_LAW), 175 FORMAT(A_LAW), 176 FORMAT(IMA_ADPCM), 177 FORMAT(MPEG), 178 FORMAT(GSM), 179 FORMAT(SPECIAL), 180 FORMAT(S24_3LE), 181 FORMAT(S24_3BE), 182 FORMAT(U24_3LE), 183 FORMAT(U24_3BE), 184 FORMAT(S20_3LE), 185 FORMAT(S20_3BE), 186 FORMAT(U20_3LE), 187 FORMAT(U20_3BE), 188 FORMAT(S18_3LE), 189 FORMAT(S18_3BE), 190 FORMAT(U18_3LE), 191 FORMAT(U18_3BE), 192}; 193 194static char *snd_pcm_subformat_names[] = { 195 SUBFORMAT(STD), 196}; 197 198static char *snd_pcm_tstamp_mode_names[] = { 199 TSTAMP(NONE), 200 TSTAMP(MMAP), 201}; 202 203static const char *snd_pcm_stream_name(int stream) 204{ 205 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL); 206 return snd_pcm_stream_names[stream]; 207} 208 209static const char *snd_pcm_access_name(snd_pcm_access_t access) 210{ 211 return snd_pcm_access_names[access]; 212} 213 214const char *snd_pcm_format_name(snd_pcm_format_t format) 215{ 216 return snd_pcm_format_names[format]; 217} 218 219static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 220{ 221 return snd_pcm_subformat_names[subformat]; 222} 223 224static const char *snd_pcm_tstamp_mode_name(int mode) 225{ 226 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL); 227 return snd_pcm_tstamp_mode_names[mode]; 228} 229 230static const char *snd_pcm_state_name(snd_pcm_state_t state) 231{ 232 return snd_pcm_state_names[state]; 233} 234 235#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 236#include <linux/soundcard.h> 237static const char *snd_pcm_oss_format_name(int format) 238{ 239 switch (format) { 240 case AFMT_MU_LAW: 241 return "MU_LAW"; 242 case AFMT_A_LAW: 243 return "A_LAW"; 244 case AFMT_IMA_ADPCM: 245 return "IMA_ADPCM"; 246 case AFMT_U8: 247 return "U8"; 248 case AFMT_S16_LE: 249 return "S16_LE"; 250 case AFMT_S16_BE: 251 return "S16_BE"; 252 case AFMT_S8: 253 return "S8"; 254 case AFMT_U16_LE: 255 return "U16_LE"; 256 case AFMT_U16_BE: 257 return "U16_BE"; 258 case AFMT_MPEG: 259 return "MPEG"; 260 default: 261 return "unknown"; 262 } 263} 264#endif 265 266#ifdef CONFIG_PROC_FS 267static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 268 struct snd_info_buffer *buffer) 269{ 270 struct snd_pcm_info *info; 271 int err; 272 273 if (! substream) 274 return; 275 276 info = kmalloc(sizeof(*info), GFP_KERNEL); 277 if (! info) { 278 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 279 return; 280 } 281 282 err = snd_pcm_info(substream, info); 283 if (err < 0) { 284 snd_iprintf(buffer, "error %d\n", err); 285 kfree(info); 286 return; 287 } 288 snd_iprintf(buffer, "card: %d\n", info->card); 289 snd_iprintf(buffer, "device: %d\n", info->device); 290 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 291 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 292 snd_iprintf(buffer, "id: %s\n", info->id); 293 snd_iprintf(buffer, "name: %s\n", info->name); 294 snd_iprintf(buffer, "subname: %s\n", info->subname); 295 snd_iprintf(buffer, "class: %d\n", info->dev_class); 296 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 297 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 298 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 299 kfree(info); 300} 301 302static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 303 struct snd_info_buffer *buffer) 304{ 305 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 306 buffer); 307} 308 309static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 310 struct snd_info_buffer *buffer) 311{ 312 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data, 313 buffer); 314} 315 316static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 317 struct snd_info_buffer *buffer) 318{ 319 struct snd_pcm_substream *substream = entry->private_data; 320 struct snd_pcm_runtime *runtime = substream->runtime; 321 if (!runtime) { 322 snd_iprintf(buffer, "closed\n"); 323 return; 324 } 325 snd_pcm_stream_lock_irq(substream); 326 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 327 snd_iprintf(buffer, "no setup\n"); 328 snd_pcm_stream_unlock_irq(substream); 329 return; 330 } 331 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 332 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 333 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 334 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 335 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 336 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 337 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 338 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time); 339#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 340 if (substream->oss.oss) { 341 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 342 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 343 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 344 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 345 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 346 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 347 } 348#endif 349 snd_pcm_stream_unlock_irq(substream); 350} 351 352static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 353 struct snd_info_buffer *buffer) 354{ 355 struct snd_pcm_substream *substream = entry->private_data; 356 struct snd_pcm_runtime *runtime = substream->runtime; 357 if (!runtime) { 358 snd_iprintf(buffer, "closed\n"); 359 return; 360 } 361 snd_pcm_stream_lock_irq(substream); 362 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 363 snd_iprintf(buffer, "no setup\n"); 364 snd_pcm_stream_unlock_irq(substream); 365 return; 366 } 367 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 368 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 369 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min); 370 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 371 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align); 372 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 373 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 374 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 375 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 376 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 377 snd_pcm_stream_unlock_irq(substream); 378} 379 380static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 381 struct snd_info_buffer *buffer) 382{ 383 struct snd_pcm_substream *substream = entry->private_data; 384 struct snd_pcm_runtime *runtime = substream->runtime; 385 struct snd_pcm_status status; 386 int err; 387 if (!runtime) { 388 snd_iprintf(buffer, "closed\n"); 389 return; 390 } 391 memset(&status, 0, sizeof(status)); 392 err = snd_pcm_status(substream, &status); 393 if (err < 0) { 394 snd_iprintf(buffer, "error %d\n", err); 395 return; 396 } 397 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 398 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 399 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 400 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 401 status.tstamp.tv_sec, status.tstamp.tv_nsec); 402 snd_iprintf(buffer, "delay : %ld\n", status.delay); 403 snd_iprintf(buffer, "avail : %ld\n", status.avail); 404 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 405 snd_iprintf(buffer, "-----\n"); 406 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 407 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 408} 409#endif 410 411#ifdef CONFIG_SND_DEBUG 412static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 413 struct snd_info_buffer *buffer) 414{ 415 struct snd_pcm_str *pstr = entry->private_data; 416 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 417} 418 419static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 420 struct snd_info_buffer *buffer) 421{ 422 struct snd_pcm_str *pstr = entry->private_data; 423 char line[64]; 424 if (!snd_info_get_line(buffer, line, sizeof(line))) 425 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 426} 427#endif 428 429static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 430{ 431 struct snd_pcm *pcm = pstr->pcm; 432 struct snd_info_entry *entry; 433 char name[16]; 434 435 sprintf(name, "pcm%i%c", pcm->device, 436 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 437 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 438 return -ENOMEM; 439 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 440 if (snd_info_register(entry) < 0) { 441 snd_info_free_entry(entry); 442 return -ENOMEM; 443 } 444 pstr->proc_root = entry; 445 446 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 447 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read); 448 if (snd_info_register(entry) < 0) { 449 snd_info_free_entry(entry); 450 entry = NULL; 451 } 452 } 453 pstr->proc_info_entry = entry; 454 455#ifdef CONFIG_SND_DEBUG 456 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 457 pstr->proc_root)) != NULL) { 458 entry->c.text.read_size = 64; 459 entry->c.text.read = snd_pcm_xrun_debug_read; 460 entry->c.text.write_size = 64; 461 entry->c.text.write = snd_pcm_xrun_debug_write; 462 entry->mode |= S_IWUSR; 463 entry->private_data = pstr; 464 if (snd_info_register(entry) < 0) { 465 snd_info_free_entry(entry); 466 entry = NULL; 467 } 468 } 469 pstr->proc_xrun_debug_entry = entry; 470#endif 471 return 0; 472} 473 474static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 475{ 476#ifdef CONFIG_SND_DEBUG 477 if (pstr->proc_xrun_debug_entry) { 478 snd_info_unregister(pstr->proc_xrun_debug_entry); 479 pstr->proc_xrun_debug_entry = NULL; 480 } 481#endif 482 if (pstr->proc_info_entry) { 483 snd_info_unregister(pstr->proc_info_entry); 484 pstr->proc_info_entry = NULL; 485 } 486 if (pstr->proc_root) { 487 snd_info_unregister(pstr->proc_root); 488 pstr->proc_root = NULL; 489 } 490 return 0; 491} 492 493static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 494{ 495 struct snd_info_entry *entry; 496 struct snd_card *card; 497 char name[16]; 498 499 card = substream->pcm->card; 500 501 sprintf(name, "sub%i", substream->number); 502 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 503 return -ENOMEM; 504 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 505 if (snd_info_register(entry) < 0) { 506 snd_info_free_entry(entry); 507 return -ENOMEM; 508 } 509 substream->proc_root = entry; 510 511 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 512 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read); 513 if (snd_info_register(entry) < 0) { 514 snd_info_free_entry(entry); 515 entry = NULL; 516 } 517 } 518 substream->proc_info_entry = entry; 519 520 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 521 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read); 522 if (snd_info_register(entry) < 0) { 523 snd_info_free_entry(entry); 524 entry = NULL; 525 } 526 } 527 substream->proc_hw_params_entry = entry; 528 529 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 530 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read); 531 if (snd_info_register(entry) < 0) { 532 snd_info_free_entry(entry); 533 entry = NULL; 534 } 535 } 536 substream->proc_sw_params_entry = entry; 537 538 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 539 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read); 540 if (snd_info_register(entry) < 0) { 541 snd_info_free_entry(entry); 542 entry = NULL; 543 } 544 } 545 substream->proc_status_entry = entry; 546 547 return 0; 548} 549 550static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 551{ 552 if (substream->proc_info_entry) { 553 snd_info_unregister(substream->proc_info_entry); 554 substream->proc_info_entry = NULL; 555 } 556 if (substream->proc_hw_params_entry) { 557 snd_info_unregister(substream->proc_hw_params_entry); 558 substream->proc_hw_params_entry = NULL; 559 } 560 if (substream->proc_sw_params_entry) { 561 snd_info_unregister(substream->proc_sw_params_entry); 562 substream->proc_sw_params_entry = NULL; 563 } 564 if (substream->proc_status_entry) { 565 snd_info_unregister(substream->proc_status_entry); 566 substream->proc_status_entry = NULL; 567 } 568 if (substream->proc_root) { 569 snd_info_unregister(substream->proc_root); 570 substream->proc_root = NULL; 571 } 572 return 0; 573} 574 575/** 576 * snd_pcm_new_stream - create a new PCM stream 577 * @pcm: the pcm instance 578 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 579 * @substream_count: the number of substreams 580 * 581 * Creates a new stream for the pcm. 582 * The corresponding stream on the pcm must have been empty before 583 * calling this, i.e. zero must be given to the argument of 584 * snd_pcm_new(). 585 * 586 * Returns zero if successful, or a negative error code on failure. 587 */ 588int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 589{ 590 int idx, err; 591 struct snd_pcm_str *pstr = &pcm->streams[stream]; 592 struct snd_pcm_substream *substream, *prev; 593 594#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 595 init_MUTEX(&pstr->oss.setup_mutex); 596#endif 597 pstr->stream = stream; 598 pstr->pcm = pcm; 599 pstr->substream_count = substream_count; 600 pstr->reg = &snd_pcm_reg[stream]; 601 if (substream_count > 0) { 602 err = snd_pcm_stream_proc_init(pstr); 603 if (err < 0) 604 return err; 605 } 606 prev = NULL; 607 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 608 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 609 if (substream == NULL) 610 return -ENOMEM; 611 substream->pcm = pcm; 612 substream->pstr = pstr; 613 substream->number = idx; 614 substream->stream = stream; 615 sprintf(substream->name, "subdevice #%i", idx); 616 substream->buffer_bytes_max = UINT_MAX; 617 if (prev == NULL) 618 pstr->substream = substream; 619 else 620 prev->next = substream; 621 err = snd_pcm_substream_proc_init(substream); 622 if (err < 0) { 623 kfree(substream); 624 return err; 625 } 626 substream->group = &substream->self_group; 627 spin_lock_init(&substream->self_group.lock); 628 INIT_LIST_HEAD(&substream->self_group.substreams); 629 list_add_tail(&substream->link_list, &substream->self_group.substreams); 630 spin_lock_init(&substream->timer_lock); 631 prev = substream; 632 } 633 return 0; 634} 635 636/** 637 * snd_pcm_new - create a new PCM instance 638 * @card: the card instance 639 * @id: the id string 640 * @device: the device index (zero based) 641 * @playback_count: the number of substreams for playback 642 * @capture_count: the number of substreams for capture 643 * @rpcm: the pointer to store the new pcm instance 644 * 645 * Creates a new PCM instance. 646 * 647 * The pcm operators have to be set afterwards to the new instance 648 * via snd_pcm_set_ops(). 649 * 650 * Returns zero if successful, or a negative error code on failure. 651 */ 652int snd_pcm_new(struct snd_card *card, char *id, int device, 653 int playback_count, int capture_count, 654 struct snd_pcm ** rpcm) 655{ 656 struct snd_pcm *pcm; 657 int err; 658 static struct snd_device_ops ops = { 659 .dev_free = snd_pcm_dev_free, 660 .dev_register = snd_pcm_dev_register, 661 .dev_disconnect = snd_pcm_dev_disconnect, 662 .dev_unregister = snd_pcm_dev_unregister 663 }; 664 665 snd_assert(rpcm != NULL, return -EINVAL); 666 *rpcm = NULL; 667 snd_assert(card != NULL, return -ENXIO); 668 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 669 if (pcm == NULL) 670 return -ENOMEM; 671 pcm->card = card; 672 pcm->device = device; 673 if (id) { 674 strlcpy(pcm->id, id, sizeof(pcm->id)); 675 } 676 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 677 snd_pcm_free(pcm); 678 return err; 679 } 680 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 681 snd_pcm_free(pcm); 682 return err; 683 } 684 init_MUTEX(&pcm->open_mutex); 685 init_waitqueue_head(&pcm->open_wait); 686 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 687 snd_pcm_free(pcm); 688 return err; 689 } 690 *rpcm = pcm; 691 return 0; 692} 693 694static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 695{ 696 struct snd_pcm_substream *substream, *substream_next; 697#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 698 struct snd_pcm_oss_setup *setup, *setupn; 699#endif 700 substream = pstr->substream; 701 while (substream) { 702 substream_next = substream->next; 703 snd_pcm_substream_proc_done(substream); 704 kfree(substream); 705 substream = substream_next; 706 } 707 snd_pcm_stream_proc_done(pstr); 708#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 709 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 710 setupn = setup->next; 711 kfree(setup->task_name); 712 kfree(setup); 713 } 714#endif 715} 716 717static int snd_pcm_free(struct snd_pcm *pcm) 718{ 719 snd_assert(pcm != NULL, return -ENXIO); 720 if (pcm->private_free) 721 pcm->private_free(pcm); 722 snd_pcm_lib_preallocate_free_for_all(pcm); 723 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 724 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 725 kfree(pcm); 726 return 0; 727} 728 729static int snd_pcm_dev_free(struct snd_device *device) 730{ 731 struct snd_pcm *pcm = device->device_data; 732 return snd_pcm_free(pcm); 733} 734 735static void snd_pcm_tick_timer_func(unsigned long data) 736{ 737 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data; 738 snd_pcm_tick_elapsed(substream); 739} 740 741int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 742 struct snd_pcm_substream **rsubstream) 743{ 744 struct snd_pcm_str * pstr; 745 struct snd_pcm_substream *substream; 746 struct snd_pcm_runtime *runtime; 747 struct snd_ctl_file *kctl; 748 struct snd_card *card; 749 struct list_head *list; 750 int prefer_subdevice = -1; 751 size_t size; 752 753 snd_assert(rsubstream != NULL, return -EINVAL); 754 *rsubstream = NULL; 755 snd_assert(pcm != NULL, return -ENXIO); 756 pstr = &pcm->streams[stream]; 757 if (pstr->substream == NULL) 758 return -ENODEV; 759 760 card = pcm->card; 761 down_read(&card->controls_rwsem); 762 list_for_each(list, &card->ctl_files) { 763 kctl = snd_ctl_file(list); 764 if (kctl->pid == current->pid) { 765 prefer_subdevice = kctl->prefer_pcm_subdevice; 766 break; 767 } 768 } 769 up_read(&card->controls_rwsem); 770 771 if (pstr->substream_count == 0) 772 return -ENODEV; 773 switch (stream) { 774 case SNDRV_PCM_STREAM_PLAYBACK: 775 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 776 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 777 if (SUBSTREAM_BUSY(substream)) 778 return -EAGAIN; 779 } 780 } 781 break; 782 case SNDRV_PCM_STREAM_CAPTURE: 783 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 784 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 785 if (SUBSTREAM_BUSY(substream)) 786 return -EAGAIN; 787 } 788 } 789 break; 790 default: 791 return -EINVAL; 792 } 793 794 if (prefer_subdevice >= 0) { 795 for (substream = pstr->substream; substream; substream = substream->next) 796 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 797 goto __ok; 798 } 799 for (substream = pstr->substream; substream; substream = substream->next) 800 if (!SUBSTREAM_BUSY(substream)) 801 break; 802 __ok: 803 if (substream == NULL) 804 return -EAGAIN; 805 806 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 807 if (runtime == NULL) 808 return -ENOMEM; 809 810 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 811 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 812 if (runtime->status == NULL) { 813 kfree(runtime); 814 return -ENOMEM; 815 } 816 memset((void*)runtime->status, 0, size); 817 818 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 819 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 820 if (runtime->control == NULL) { 821 snd_free_pages((void*)runtime->status, 822 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 823 kfree(runtime); 824 return -ENOMEM; 825 } 826 memset((void*)runtime->control, 0, size); 827 828 init_waitqueue_head(&runtime->sleep); 829 atomic_set(&runtime->mmap_count, 0); 830 init_timer(&runtime->tick_timer); 831 runtime->tick_timer.function = snd_pcm_tick_timer_func; 832 runtime->tick_timer.data = (unsigned long) substream; 833 834 runtime->status->state = SNDRV_PCM_STATE_OPEN; 835 836 substream->runtime = runtime; 837 substream->private_data = pcm->private_data; 838 pstr->substream_opened++; 839 *rsubstream = substream; 840 return 0; 841} 842 843void snd_pcm_release_substream(struct snd_pcm_substream *substream) 844{ 845 struct snd_pcm_runtime *runtime; 846 substream->file = NULL; 847 runtime = substream->runtime; 848 snd_assert(runtime != NULL, return); 849 if (runtime->private_free != NULL) 850 runtime->private_free(runtime); 851 snd_free_pages((void*)runtime->status, 852 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 853 snd_free_pages((void*)runtime->control, 854 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 855 kfree(runtime->hw_constraints.rules); 856 kfree(runtime); 857 substream->runtime = NULL; 858 substream->pstr->substream_opened--; 859} 860 861static int snd_pcm_dev_register(struct snd_device *device) 862{ 863 int idx, cidx, err; 864 unsigned short minor; 865 struct snd_pcm_substream *substream; 866 struct list_head *list; 867 char str[16]; 868 struct snd_pcm *pcm = device->device_data; 869 870 snd_assert(pcm != NULL && device != NULL, return -ENXIO); 871 down(®ister_mutex); 872 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 873 if (snd_pcm_devices[idx]) { 874 up(®ister_mutex); 875 return -EBUSY; 876 } 877 snd_pcm_devices[idx] = pcm; 878 for (cidx = 0; cidx < 2; cidx++) { 879 int devtype = -1; 880 if (pcm->streams[cidx].substream == NULL) 881 continue; 882 switch (cidx) { 883 case SNDRV_PCM_STREAM_PLAYBACK: 884 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 885 minor = SNDRV_MINOR_PCM_PLAYBACK + idx; 886 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 887 break; 888 case SNDRV_PCM_STREAM_CAPTURE: 889 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 890 minor = SNDRV_MINOR_PCM_CAPTURE + idx; 891 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 892 break; 893 } 894 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) { 895 snd_pcm_devices[idx] = NULL; 896 up(®ister_mutex); 897 return err; 898 } 899 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 900 snd_pcm_timer_init(substream); 901 } 902 list_for_each(list, &snd_pcm_notify_list) { 903 struct snd_pcm_notify *notify; 904 notify = list_entry(list, struct snd_pcm_notify, list); 905 notify->n_register(pcm); 906 } 907 up(®ister_mutex); 908 return 0; 909} 910 911static int snd_pcm_dev_disconnect(struct snd_device *device) 912{ 913 struct snd_pcm *pcm = device->device_data; 914 struct list_head *list; 915 struct snd_pcm_substream *substream; 916 int idx, cidx; 917 918 down(®ister_mutex); 919 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 920 snd_pcm_devices[idx] = NULL; 921 for (cidx = 0; cidx < 2; cidx++) 922 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 923 if (substream->runtime) 924 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 925 list_for_each(list, &snd_pcm_notify_list) { 926 struct snd_pcm_notify *notify; 927 notify = list_entry(list, struct snd_pcm_notify, list); 928 notify->n_disconnect(pcm); 929 } 930 up(®ister_mutex); 931 return 0; 932} 933 934static int snd_pcm_dev_unregister(struct snd_device *device) 935{ 936 int idx, cidx, devtype; 937 struct snd_pcm_substream *substream; 938 struct list_head *list; 939 struct snd_pcm *pcm = device->device_data; 940 941 snd_assert(pcm != NULL, return -ENXIO); 942 down(®ister_mutex); 943 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 944 snd_pcm_devices[idx] = NULL; 945 for (cidx = 0; cidx < 2; cidx++) { 946 devtype = -1; 947 switch (cidx) { 948 case SNDRV_PCM_STREAM_PLAYBACK: 949 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 950 break; 951 case SNDRV_PCM_STREAM_CAPTURE: 952 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 953 break; 954 } 955 snd_unregister_device(devtype, pcm->card, pcm->device); 956 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 957 snd_pcm_timer_done(substream); 958 } 959 list_for_each(list, &snd_pcm_notify_list) { 960 struct snd_pcm_notify *notify; 961 notify = list_entry(list, struct snd_pcm_notify, list); 962 notify->n_unregister(pcm); 963 } 964 up(®ister_mutex); 965 return snd_pcm_free(pcm); 966} 967 968int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 969{ 970 int idx; 971 972 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); 973 down(®ister_mutex); 974 if (nfree) { 975 list_del(¬ify->list); 976 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 977 if (snd_pcm_devices[idx] == NULL) 978 continue; 979 notify->n_unregister(snd_pcm_devices[idx]); 980 } 981 } else { 982 list_add_tail(¬ify->list, &snd_pcm_notify_list); 983 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 984 if (snd_pcm_devices[idx] == NULL) 985 continue; 986 notify->n_register(snd_pcm_devices[idx]); 987 } 988 } 989 up(®ister_mutex); 990 return 0; 991} 992 993/* 994 * Info interface 995 */ 996 997static void snd_pcm_proc_read(struct snd_info_entry *entry, 998 struct snd_info_buffer *buffer) 999{ 1000 int idx; 1001 struct snd_pcm *pcm; 1002 1003 down(®ister_mutex); 1004 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 1005 pcm = snd_pcm_devices[idx]; 1006 if (pcm == NULL) 1007 continue; 1008 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES, 1009 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name); 1010 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1011 snd_iprintf(buffer, " : playback %i", 1012 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1013 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1014 snd_iprintf(buffer, " : capture %i", 1015 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1016 snd_iprintf(buffer, "\n"); 1017 } 1018 up(®ister_mutex); 1019} 1020 1021/* 1022 * ENTRY functions 1023 */ 1024 1025static struct snd_info_entry *snd_pcm_proc_entry = NULL; 1026 1027static int __init alsa_pcm_init(void) 1028{ 1029 struct snd_info_entry *entry; 1030 1031 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1032 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1033 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1034 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, 1035 snd_pcm_proc_read); 1036 if (snd_info_register(entry) < 0) { 1037 snd_info_free_entry(entry); 1038 entry = NULL; 1039 } 1040 } 1041 snd_pcm_proc_entry = entry; 1042 return 0; 1043} 1044 1045static void __exit alsa_pcm_exit(void) 1046{ 1047 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1048 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1049 if (snd_pcm_proc_entry) { 1050 snd_info_unregister(snd_pcm_proc_entry); 1051 snd_pcm_proc_entry = NULL; 1052 } 1053} 1054 1055module_init(alsa_pcm_init) 1056module_exit(alsa_pcm_exit) 1057 1058EXPORT_SYMBOL(snd_pcm_devices); 1059EXPORT_SYMBOL(snd_pcm_new); 1060EXPORT_SYMBOL(snd_pcm_new_stream); 1061EXPORT_SYMBOL(snd_pcm_notify); 1062EXPORT_SYMBOL(snd_pcm_open_substream); 1063EXPORT_SYMBOL(snd_pcm_release_substream); 1064EXPORT_SYMBOL(snd_pcm_format_name); 1065 /* pcm_native.c */ 1066EXPORT_SYMBOL(snd_pcm_link_rwlock); 1067#ifdef CONFIG_PM 1068EXPORT_SYMBOL(snd_pcm_suspend); 1069EXPORT_SYMBOL(snd_pcm_suspend_all); 1070#endif 1071EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl); 1072EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl); 1073EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 1074EXPORT_SYMBOL(snd_pcm_mmap_data); 1075#if SNDRV_PCM_INFO_MMAP_IOMEM 1076EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 1077#endif 1078 /* pcm_misc.c */ 1079EXPORT_SYMBOL(snd_pcm_format_signed); 1080EXPORT_SYMBOL(snd_pcm_format_unsigned); 1081EXPORT_SYMBOL(snd_pcm_format_linear); 1082EXPORT_SYMBOL(snd_pcm_format_little_endian); 1083EXPORT_SYMBOL(snd_pcm_format_big_endian); 1084EXPORT_SYMBOL(snd_pcm_format_width); 1085EXPORT_SYMBOL(snd_pcm_format_physical_width); 1086EXPORT_SYMBOL(snd_pcm_format_size); 1087EXPORT_SYMBOL(snd_pcm_format_silence_64); 1088EXPORT_SYMBOL(snd_pcm_format_set_silence); 1089EXPORT_SYMBOL(snd_pcm_build_linear_format); 1090EXPORT_SYMBOL(snd_pcm_limit_hw_rates); 1091