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