pcm.c revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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 36snd_pcm_t *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(snd_pcm_t *pcm); 41static int snd_pcm_dev_free(snd_device_t *device); 42static int snd_pcm_dev_register(snd_device_t *device); 43static int snd_pcm_dev_disconnect(snd_device_t *device); 44static int snd_pcm_dev_unregister(snd_device_t *device); 45 46static int snd_pcm_control_ioctl(snd_card_t * card, 47 snd_ctl_file_t * 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 snd_pcm_info_t __user *info; 75 unsigned int device, subdevice; 76 snd_pcm_stream_t stream; 77 snd_pcm_t *pcm; 78 snd_pcm_str_t *pstr; 79 snd_pcm_substream_t *substream; 80 info = (snd_pcm_info_t __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(snd_pcm_stream_t 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 snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL); 212 return snd_pcm_access_names[access]; 213} 214 215const char *snd_pcm_format_name(snd_pcm_format_t format) 216{ 217 snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL); 218 return snd_pcm_format_names[format]; 219} 220 221static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 222{ 223 snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL); 224 return snd_pcm_subformat_names[subformat]; 225} 226 227static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode) 228{ 229 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL); 230 return snd_pcm_tstamp_mode_names[mode]; 231} 232 233static const char *snd_pcm_state_name(snd_pcm_state_t state) 234{ 235 snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL); 236 return snd_pcm_state_names[state]; 237} 238 239#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 240#include <linux/soundcard.h> 241static const char *snd_pcm_oss_format_name(int format) 242{ 243 switch (format) { 244 case AFMT_MU_LAW: 245 return "MU_LAW"; 246 case AFMT_A_LAW: 247 return "A_LAW"; 248 case AFMT_IMA_ADPCM: 249 return "IMA_ADPCM"; 250 case AFMT_U8: 251 return "U8"; 252 case AFMT_S16_LE: 253 return "S16_LE"; 254 case AFMT_S16_BE: 255 return "S16_BE"; 256 case AFMT_S8: 257 return "S8"; 258 case AFMT_U16_LE: 259 return "U16_LE"; 260 case AFMT_U16_BE: 261 return "U16_BE"; 262 case AFMT_MPEG: 263 return "MPEG"; 264 default: 265 return "unknown"; 266 } 267} 268#endif 269 270#ifdef CONFIG_PROC_FS 271static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer) 272{ 273 snd_pcm_info_t *info; 274 int err; 275 276 snd_runtime_check(substream, return); 277 278 info = kmalloc(sizeof(*info), GFP_KERNEL); 279 if (! info) { 280 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 281 return; 282 } 283 284 err = snd_pcm_info(substream, info); 285 if (err < 0) { 286 snd_iprintf(buffer, "error %d\n", err); 287 kfree(info); 288 return; 289 } 290 snd_iprintf(buffer, "card: %d\n", info->card); 291 snd_iprintf(buffer, "device: %d\n", info->device); 292 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 293 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 294 snd_iprintf(buffer, "id: %s\n", info->id); 295 snd_iprintf(buffer, "name: %s\n", info->name); 296 snd_iprintf(buffer, "subname: %s\n", info->subname); 297 snd_iprintf(buffer, "class: %d\n", info->dev_class); 298 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 299 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 300 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 301 kfree(info); 302} 303 304static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 305{ 306 snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer); 307} 308 309static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 310{ 311 snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer); 312} 313 314static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 315{ 316 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 317 snd_pcm_runtime_t *runtime = substream->runtime; 318 if (!runtime) { 319 snd_iprintf(buffer, "closed\n"); 320 return; 321 } 322 snd_pcm_stream_lock_irq(substream); 323 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 324 snd_iprintf(buffer, "no setup\n"); 325 snd_pcm_stream_unlock_irq(substream); 326 return; 327 } 328 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 329 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 330 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 331 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 332 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 333 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 334 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 335 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time); 336#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 337 if (substream->oss.oss) { 338 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 339 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 340 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 341 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 342 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 343 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 344 } 345#endif 346 snd_pcm_stream_unlock_irq(substream); 347} 348 349static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 350{ 351 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 352 snd_pcm_runtime_t *runtime = substream->runtime; 353 if (!runtime) { 354 snd_iprintf(buffer, "closed\n"); 355 return; 356 } 357 snd_pcm_stream_lock_irq(substream); 358 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 359 snd_iprintf(buffer, "no setup\n"); 360 snd_pcm_stream_unlock_irq(substream); 361 return; 362 } 363 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 364 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 365 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min); 366 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 367 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align); 368 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 369 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 370 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 371 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 372 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 373 snd_pcm_stream_unlock_irq(substream); 374} 375 376static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 377{ 378 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data; 379 snd_pcm_runtime_t *runtime = substream->runtime; 380 snd_pcm_status_t status; 381 int err; 382 if (!runtime) { 383 snd_iprintf(buffer, "closed\n"); 384 return; 385 } 386 memset(&status, 0, sizeof(status)); 387 err = snd_pcm_status(substream, &status); 388 if (err < 0) { 389 snd_iprintf(buffer, "error %d\n", err); 390 return; 391 } 392 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 393 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 394 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 395 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 396 status.tstamp.tv_sec, status.tstamp.tv_nsec); 397 snd_iprintf(buffer, "delay : %ld\n", status.delay); 398 snd_iprintf(buffer, "avail : %ld\n", status.avail); 399 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 400 snd_iprintf(buffer, "-----\n"); 401 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 402 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 403} 404#endif 405 406#ifdef CONFIG_SND_DEBUG 407static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 408{ 409 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data; 410 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 411} 412 413static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer) 414{ 415 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data; 416 char line[64]; 417 if (!snd_info_get_line(buffer, line, sizeof(line))) 418 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 419} 420#endif 421 422static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr) 423{ 424 snd_pcm_t *pcm = pstr->pcm; 425 snd_info_entry_t *entry; 426 char name[16]; 427 428 sprintf(name, "pcm%i%c", pcm->device, 429 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 430 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 431 return -ENOMEM; 432 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 433 if (snd_info_register(entry) < 0) { 434 snd_info_free_entry(entry); 435 return -ENOMEM; 436 } 437 pstr->proc_root = entry; 438 439 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 440 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read); 441 if (snd_info_register(entry) < 0) { 442 snd_info_free_entry(entry); 443 entry = NULL; 444 } 445 } 446 pstr->proc_info_entry = entry; 447 448#ifdef CONFIG_SND_DEBUG 449 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) { 450 entry->c.text.read_size = 64; 451 entry->c.text.read = snd_pcm_xrun_debug_read; 452 entry->c.text.write_size = 64; 453 entry->c.text.write = snd_pcm_xrun_debug_write; 454 entry->private_data = pstr; 455 if (snd_info_register(entry) < 0) { 456 snd_info_free_entry(entry); 457 entry = NULL; 458 } 459 } 460 pstr->proc_xrun_debug_entry = entry; 461#endif 462 return 0; 463} 464 465static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr) 466{ 467#ifdef CONFIG_SND_DEBUG 468 if (pstr->proc_xrun_debug_entry) { 469 snd_info_unregister(pstr->proc_xrun_debug_entry); 470 pstr->proc_xrun_debug_entry = NULL; 471 } 472#endif 473 if (pstr->proc_info_entry) { 474 snd_info_unregister(pstr->proc_info_entry); 475 pstr->proc_info_entry = NULL; 476 } 477 if (pstr->proc_root) { 478 snd_info_unregister(pstr->proc_root); 479 pstr->proc_root = NULL; 480 } 481 return 0; 482} 483 484static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream) 485{ 486 snd_info_entry_t *entry; 487 snd_card_t *card; 488 char name[16]; 489 490 card = substream->pcm->card; 491 492 sprintf(name, "sub%i", substream->number); 493 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 494 return -ENOMEM; 495 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 496 if (snd_info_register(entry) < 0) { 497 snd_info_free_entry(entry); 498 return -ENOMEM; 499 } 500 substream->proc_root = entry; 501 502 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 503 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read); 504 if (snd_info_register(entry) < 0) { 505 snd_info_free_entry(entry); 506 entry = NULL; 507 } 508 } 509 substream->proc_info_entry = entry; 510 511 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 512 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read); 513 if (snd_info_register(entry) < 0) { 514 snd_info_free_entry(entry); 515 entry = NULL; 516 } 517 } 518 substream->proc_hw_params_entry = entry; 519 520 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 521 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read); 522 if (snd_info_register(entry) < 0) { 523 snd_info_free_entry(entry); 524 entry = NULL; 525 } 526 } 527 substream->proc_sw_params_entry = entry; 528 529 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 530 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read); 531 if (snd_info_register(entry) < 0) { 532 snd_info_free_entry(entry); 533 entry = NULL; 534 } 535 } 536 substream->proc_status_entry = entry; 537 538 return 0; 539} 540 541static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream) 542{ 543 if (substream->proc_info_entry) { 544 snd_info_unregister(substream->proc_info_entry); 545 substream->proc_info_entry = NULL; 546 } 547 if (substream->proc_hw_params_entry) { 548 snd_info_unregister(substream->proc_hw_params_entry); 549 substream->proc_hw_params_entry = NULL; 550 } 551 if (substream->proc_sw_params_entry) { 552 snd_info_unregister(substream->proc_sw_params_entry); 553 substream->proc_sw_params_entry = NULL; 554 } 555 if (substream->proc_status_entry) { 556 snd_info_unregister(substream->proc_status_entry); 557 substream->proc_status_entry = NULL; 558 } 559 if (substream->proc_root) { 560 snd_info_unregister(substream->proc_root); 561 substream->proc_root = NULL; 562 } 563 return 0; 564} 565 566/** 567 * snd_pcm_new_stream - create a new PCM stream 568 * @pcm: the pcm instance 569 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 570 * @substream_count: the number of substreams 571 * 572 * Creates a new stream for the pcm. 573 * The corresponding stream on the pcm must have been empty before 574 * calling this, i.e. zero must be given to the argument of 575 * snd_pcm_new(). 576 * 577 * Returns zero if successful, or a negative error code on failure. 578 */ 579int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count) 580{ 581 int idx, err; 582 snd_pcm_str_t *pstr = &pcm->streams[stream]; 583 snd_pcm_substream_t *substream, *prev; 584 585#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 586 init_MUTEX(&pstr->oss.setup_mutex); 587#endif 588 pstr->stream = stream; 589 pstr->pcm = pcm; 590 pstr->substream_count = substream_count; 591 pstr->reg = &snd_pcm_reg[stream]; 592 if (substream_count > 0) { 593 err = snd_pcm_stream_proc_init(pstr); 594 if (err < 0) 595 return err; 596 } 597 prev = NULL; 598 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 599 substream = kcalloc(1, sizeof(*substream), GFP_KERNEL); 600 if (substream == NULL) 601 return -ENOMEM; 602 substream->pcm = pcm; 603 substream->pstr = pstr; 604 substream->number = idx; 605 substream->stream = stream; 606 sprintf(substream->name, "subdevice #%i", idx); 607 substream->buffer_bytes_max = UINT_MAX; 608 if (prev == NULL) 609 pstr->substream = substream; 610 else 611 prev->next = substream; 612 err = snd_pcm_substream_proc_init(substream); 613 if (err < 0) { 614 kfree(substream); 615 return err; 616 } 617 substream->group = &substream->self_group; 618 spin_lock_init(&substream->self_group.lock); 619 INIT_LIST_HEAD(&substream->self_group.substreams); 620 list_add_tail(&substream->link_list, &substream->self_group.substreams); 621 spin_lock_init(&substream->timer_lock); 622 prev = substream; 623 } 624 return 0; 625} 626 627/** 628 * snd_pcm_new - create a new PCM instance 629 * @card: the card instance 630 * @id: the id string 631 * @device: the device index (zero based) 632 * @playback_count: the number of substreams for playback 633 * @capture_count: the number of substreams for capture 634 * @rpcm: the pointer to store the new pcm instance 635 * 636 * Creates a new PCM instance. 637 * 638 * The pcm operators have to be set afterwards to the new instance 639 * via snd_pcm_set_ops(). 640 * 641 * Returns zero if successful, or a negative error code on failure. 642 */ 643int snd_pcm_new(snd_card_t * card, char *id, int device, 644 int playback_count, int capture_count, 645 snd_pcm_t ** rpcm) 646{ 647 snd_pcm_t *pcm; 648 int err; 649 static snd_device_ops_t ops = { 650 .dev_free = snd_pcm_dev_free, 651 .dev_register = snd_pcm_dev_register, 652 .dev_disconnect = snd_pcm_dev_disconnect, 653 .dev_unregister = snd_pcm_dev_unregister 654 }; 655 656 snd_assert(rpcm != NULL, return -EINVAL); 657 *rpcm = NULL; 658 snd_assert(card != NULL, return -ENXIO); 659 pcm = kcalloc(1, sizeof(*pcm), GFP_KERNEL); 660 if (pcm == NULL) 661 return -ENOMEM; 662 pcm->card = card; 663 pcm->device = device; 664 if (id) { 665 strlcpy(pcm->id, id, sizeof(pcm->id)); 666 } 667 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 668 snd_pcm_free(pcm); 669 return err; 670 } 671 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 672 snd_pcm_free(pcm); 673 return err; 674 } 675 init_MUTEX(&pcm->open_mutex); 676 init_waitqueue_head(&pcm->open_wait); 677 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 678 snd_pcm_free(pcm); 679 return err; 680 } 681 *rpcm = pcm; 682 return 0; 683} 684 685static void snd_pcm_free_stream(snd_pcm_str_t * pstr) 686{ 687 snd_pcm_substream_t *substream, *substream_next; 688#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 689 snd_pcm_oss_setup_t *setup, *setupn; 690#endif 691 substream = pstr->substream; 692 while (substream) { 693 substream_next = substream->next; 694 snd_pcm_substream_proc_done(substream); 695 kfree(substream); 696 substream = substream_next; 697 } 698 snd_pcm_stream_proc_done(pstr); 699#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 700 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 701 setupn = setup->next; 702 kfree(setup->task_name); 703 kfree(setup); 704 } 705#endif 706} 707 708static int snd_pcm_free(snd_pcm_t *pcm) 709{ 710 snd_assert(pcm != NULL, return -ENXIO); 711 if (pcm->private_free) 712 pcm->private_free(pcm); 713 snd_pcm_lib_preallocate_free_for_all(pcm); 714 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 715 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 716 kfree(pcm); 717 return 0; 718} 719 720static int snd_pcm_dev_free(snd_device_t *device) 721{ 722 snd_pcm_t *pcm = device->device_data; 723 return snd_pcm_free(pcm); 724} 725 726static void snd_pcm_tick_timer_func(unsigned long data) 727{ 728 snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data; 729 snd_pcm_tick_elapsed(substream); 730} 731 732int snd_pcm_open_substream(snd_pcm_t *pcm, int stream, 733 snd_pcm_substream_t **rsubstream) 734{ 735 snd_pcm_str_t * pstr; 736 snd_pcm_substream_t * substream; 737 snd_pcm_runtime_t * runtime; 738 snd_ctl_file_t *kctl; 739 snd_card_t *card; 740 struct list_head *list; 741 int prefer_subdevice = -1; 742 size_t size; 743 744 snd_assert(rsubstream != NULL, return -EINVAL); 745 *rsubstream = NULL; 746 snd_assert(pcm != NULL, return -ENXIO); 747 pstr = &pcm->streams[stream]; 748 if (pstr->substream == NULL) 749 return -ENODEV; 750 751 card = pcm->card; 752 down_read(&card->controls_rwsem); 753 list_for_each(list, &card->ctl_files) { 754 kctl = snd_ctl_file(list); 755 if (kctl->pid == current->pid) { 756 prefer_subdevice = kctl->prefer_pcm_subdevice; 757 break; 758 } 759 } 760 up_read(&card->controls_rwsem); 761 762 if (pstr->substream_count == 0) 763 return -ENODEV; 764 switch (stream) { 765 case SNDRV_PCM_STREAM_PLAYBACK: 766 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 767 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 768 if (SUBSTREAM_BUSY(substream)) 769 return -EAGAIN; 770 } 771 } 772 break; 773 case SNDRV_PCM_STREAM_CAPTURE: 774 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 775 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 776 if (SUBSTREAM_BUSY(substream)) 777 return -EAGAIN; 778 } 779 } 780 break; 781 default: 782 return -EINVAL; 783 } 784 785 if (prefer_subdevice >= 0) { 786 for (substream = pstr->substream; substream; substream = substream->next) 787 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 788 goto __ok; 789 } 790 for (substream = pstr->substream; substream; substream = substream->next) 791 if (!SUBSTREAM_BUSY(substream)) 792 break; 793 __ok: 794 if (substream == NULL) 795 return -EAGAIN; 796 797 runtime = kcalloc(1, sizeof(*runtime), GFP_KERNEL); 798 if (runtime == NULL) 799 return -ENOMEM; 800 801 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)); 802 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 803 if (runtime->status == NULL) { 804 kfree(runtime); 805 return -ENOMEM; 806 } 807 memset((void*)runtime->status, 0, size); 808 809 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)); 810 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 811 if (runtime->control == NULL) { 812 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t))); 813 kfree(runtime); 814 return -ENOMEM; 815 } 816 memset((void*)runtime->control, 0, size); 817 818 init_waitqueue_head(&runtime->sleep); 819 atomic_set(&runtime->mmap_count, 0); 820 init_timer(&runtime->tick_timer); 821 runtime->tick_timer.function = snd_pcm_tick_timer_func; 822 runtime->tick_timer.data = (unsigned long) substream; 823 824 runtime->status->state = SNDRV_PCM_STATE_OPEN; 825 826 substream->runtime = runtime; 827 substream->private_data = pcm->private_data; 828 pstr->substream_opened++; 829 *rsubstream = substream; 830 return 0; 831} 832 833void snd_pcm_release_substream(snd_pcm_substream_t *substream) 834{ 835 snd_pcm_runtime_t * runtime; 836 substream->file = NULL; 837 runtime = substream->runtime; 838 snd_assert(runtime != NULL, return); 839 if (runtime->private_free != NULL) 840 runtime->private_free(runtime); 841 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t))); 842 snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t))); 843 kfree(runtime->hw_constraints.rules); 844 kfree(runtime); 845 substream->runtime = NULL; 846 substream->pstr->substream_opened--; 847} 848 849static int snd_pcm_dev_register(snd_device_t *device) 850{ 851 int idx, cidx, err; 852 unsigned short minor; 853 snd_pcm_substream_t *substream; 854 struct list_head *list; 855 char str[16]; 856 snd_pcm_t *pcm = device->device_data; 857 858 snd_assert(pcm != NULL && device != NULL, return -ENXIO); 859 down(®ister_mutex); 860 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 861 if (snd_pcm_devices[idx]) { 862 up(®ister_mutex); 863 return -EBUSY; 864 } 865 snd_pcm_devices[idx] = pcm; 866 for (cidx = 0; cidx < 2; cidx++) { 867 int devtype = -1; 868 if (pcm->streams[cidx].substream == NULL) 869 continue; 870 switch (cidx) { 871 case SNDRV_PCM_STREAM_PLAYBACK: 872 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 873 minor = SNDRV_MINOR_PCM_PLAYBACK + idx; 874 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 875 break; 876 case SNDRV_PCM_STREAM_CAPTURE: 877 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 878 minor = SNDRV_MINOR_PCM_CAPTURE + idx; 879 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 880 break; 881 } 882 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) { 883 snd_pcm_devices[idx] = NULL; 884 up(®ister_mutex); 885 return err; 886 } 887 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 888 snd_pcm_timer_init(substream); 889 } 890 list_for_each(list, &snd_pcm_notify_list) { 891 snd_pcm_notify_t *notify; 892 notify = list_entry(list, snd_pcm_notify_t, list); 893 notify->n_register(pcm); 894 } 895 up(®ister_mutex); 896 return 0; 897} 898 899static int snd_pcm_dev_disconnect(snd_device_t *device) 900{ 901 snd_pcm_t *pcm = device->device_data; 902 struct list_head *list; 903 snd_pcm_substream_t *substream; 904 int idx, cidx; 905 906 down(®ister_mutex); 907 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 908 snd_pcm_devices[idx] = NULL; 909 for (cidx = 0; cidx < 2; cidx++) 910 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 911 if (substream->runtime) 912 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 913 list_for_each(list, &snd_pcm_notify_list) { 914 snd_pcm_notify_t *notify; 915 notify = list_entry(list, snd_pcm_notify_t, list); 916 notify->n_disconnect(pcm); 917 } 918 up(®ister_mutex); 919 return 0; 920} 921 922static int snd_pcm_dev_unregister(snd_device_t *device) 923{ 924 int idx, cidx, devtype; 925 snd_pcm_substream_t *substream; 926 struct list_head *list; 927 snd_pcm_t *pcm = device->device_data; 928 929 snd_assert(pcm != NULL, return -ENXIO); 930 down(®ister_mutex); 931 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; 932 snd_pcm_devices[idx] = NULL; 933 for (cidx = 0; cidx < 2; cidx++) { 934 devtype = -1; 935 switch (cidx) { 936 case SNDRV_PCM_STREAM_PLAYBACK: 937 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 938 break; 939 case SNDRV_PCM_STREAM_CAPTURE: 940 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 941 break; 942 } 943 snd_unregister_device(devtype, pcm->card, pcm->device); 944 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 945 snd_pcm_timer_done(substream); 946 } 947 list_for_each(list, &snd_pcm_notify_list) { 948 snd_pcm_notify_t *notify; 949 notify = list_entry(list, snd_pcm_notify_t, list); 950 notify->n_unregister(pcm); 951 } 952 up(®ister_mutex); 953 return snd_pcm_free(pcm); 954} 955 956int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree) 957{ 958 int idx; 959 960 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); 961 down(®ister_mutex); 962 if (nfree) { 963 list_del(¬ify->list); 964 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 965 if (snd_pcm_devices[idx] == NULL) 966 continue; 967 notify->n_unregister(snd_pcm_devices[idx]); 968 } 969 } else { 970 list_add_tail(¬ify->list, &snd_pcm_notify_list); 971 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 972 if (snd_pcm_devices[idx] == NULL) 973 continue; 974 notify->n_register(snd_pcm_devices[idx]); 975 } 976 } 977 up(®ister_mutex); 978 return 0; 979} 980 981/* 982 * Info interface 983 */ 984 985static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) 986{ 987 int idx; 988 snd_pcm_t *pcm; 989 990 down(®ister_mutex); 991 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { 992 pcm = snd_pcm_devices[idx]; 993 if (pcm == NULL) 994 continue; 995 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES, 996 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name); 997 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 998 snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 999 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1000 snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1001 snd_iprintf(buffer, "\n"); 1002 } 1003 up(®ister_mutex); 1004} 1005 1006/* 1007 * ENTRY functions 1008 */ 1009 1010static snd_info_entry_t *snd_pcm_proc_entry = NULL; 1011 1012static int __init alsa_pcm_init(void) 1013{ 1014 snd_info_entry_t *entry; 1015 1016 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1017 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1018 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1019 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read); 1020 if (snd_info_register(entry) < 0) { 1021 snd_info_free_entry(entry); 1022 entry = NULL; 1023 } 1024 } 1025 snd_pcm_proc_entry = entry; 1026 return 0; 1027} 1028 1029static void __exit alsa_pcm_exit(void) 1030{ 1031 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1032 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1033 if (snd_pcm_proc_entry) { 1034 snd_info_unregister(snd_pcm_proc_entry); 1035 snd_pcm_proc_entry = NULL; 1036 } 1037} 1038 1039module_init(alsa_pcm_init) 1040module_exit(alsa_pcm_exit) 1041 1042EXPORT_SYMBOL(snd_pcm_devices); 1043EXPORT_SYMBOL(snd_pcm_new); 1044EXPORT_SYMBOL(snd_pcm_new_stream); 1045EXPORT_SYMBOL(snd_pcm_notify); 1046EXPORT_SYMBOL(snd_pcm_open_substream); 1047EXPORT_SYMBOL(snd_pcm_release_substream); 1048EXPORT_SYMBOL(snd_pcm_format_name); 1049 /* pcm_native.c */ 1050EXPORT_SYMBOL(snd_pcm_link_rwlock); 1051EXPORT_SYMBOL(snd_pcm_start); 1052#ifdef CONFIG_PM 1053EXPORT_SYMBOL(snd_pcm_suspend); 1054EXPORT_SYMBOL(snd_pcm_suspend_all); 1055#endif 1056EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl); 1057EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl); 1058EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 1059EXPORT_SYMBOL(snd_pcm_mmap_data); 1060#if SNDRV_PCM_INFO_MMAP_IOMEM 1061EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 1062#endif 1063 /* pcm_misc.c */ 1064EXPORT_SYMBOL(snd_pcm_format_signed); 1065EXPORT_SYMBOL(snd_pcm_format_unsigned); 1066EXPORT_SYMBOL(snd_pcm_format_linear); 1067EXPORT_SYMBOL(snd_pcm_format_little_endian); 1068EXPORT_SYMBOL(snd_pcm_format_big_endian); 1069EXPORT_SYMBOL(snd_pcm_format_width); 1070EXPORT_SYMBOL(snd_pcm_format_physical_width); 1071EXPORT_SYMBOL(snd_pcm_format_silence_64); 1072EXPORT_SYMBOL(snd_pcm_format_set_silence); 1073EXPORT_SYMBOL(snd_pcm_build_linear_format); 1074EXPORT_SYMBOL(snd_pcm_limit_hw_rates); 1075