1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/init.h> 23 #include <linux/slab.h> 24 #include <linux/module.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/device.h> 28 #include <sound/core.h> 29 #include <sound/minors.h> 30 #include <sound/pcm.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 34 #include "pcm_local.h" 35 36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 37 MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 38 MODULE_LICENSE("GPL"); 39 40 static LIST_HEAD(snd_pcm_devices); 41 static DEFINE_MUTEX(register_mutex); 42 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 43 static LIST_HEAD(snd_pcm_notify_list); 44 #endif 45 46 static int snd_pcm_free(struct snd_pcm *pcm); 47 static int snd_pcm_dev_free(struct snd_device *device); 48 static int snd_pcm_dev_register(struct snd_device *device); 49 static int snd_pcm_dev_disconnect(struct snd_device *device); 50 51 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) 52 { 53 struct snd_pcm *pcm; 54 55 list_for_each_entry(pcm, &snd_pcm_devices, list) { 56 if (pcm->card == card && pcm->device == device) 57 return pcm; 58 } 59 return NULL; 60 } 61 62 static int snd_pcm_next(struct snd_card *card, int device) 63 { 64 struct snd_pcm *pcm; 65 66 list_for_each_entry(pcm, &snd_pcm_devices, list) { 67 if (pcm->card == card && pcm->device > device) 68 return pcm->device; 69 else if (pcm->card->number > card->number) 70 return -1; 71 } 72 return -1; 73 } 74 75 static int snd_pcm_add(struct snd_pcm *newpcm) 76 { 77 struct snd_pcm *pcm; 78 79 if (newpcm->internal) 80 return 0; 81 82 list_for_each_entry(pcm, &snd_pcm_devices, list) { 83 if (pcm->card == newpcm->card && pcm->device == newpcm->device) 84 return -EBUSY; 85 if (pcm->card->number > newpcm->card->number || 86 (pcm->card == newpcm->card && 87 pcm->device > newpcm->device)) { 88 list_add(&newpcm->list, pcm->list.prev); 89 return 0; 90 } 91 } 92 list_add_tail(&newpcm->list, &snd_pcm_devices); 93 return 0; 94 } 95 96 static int snd_pcm_control_ioctl(struct snd_card *card, 97 struct snd_ctl_file *control, 98 unsigned int cmd, unsigned long arg) 99 { 100 switch (cmd) { 101 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 102 { 103 int device; 104 105 if (get_user(device, (int __user *)arg)) 106 return -EFAULT; 107 mutex_lock(®ister_mutex); 108 device = snd_pcm_next(card, device); 109 mutex_unlock(®ister_mutex); 110 if (put_user(device, (int __user *)arg)) 111 return -EFAULT; 112 return 0; 113 } 114 case SNDRV_CTL_IOCTL_PCM_INFO: 115 { 116 struct snd_pcm_info __user *info; 117 unsigned int device, subdevice; 118 int stream; 119 struct snd_pcm *pcm; 120 struct snd_pcm_str *pstr; 121 struct snd_pcm_substream *substream; 122 int err; 123 124 info = (struct snd_pcm_info __user *)arg; 125 if (get_user(device, &info->device)) 126 return -EFAULT; 127 if (get_user(stream, &info->stream)) 128 return -EFAULT; 129 if (stream < 0 || stream > 1) 130 return -EINVAL; 131 if (get_user(subdevice, &info->subdevice)) 132 return -EFAULT; 133 mutex_lock(®ister_mutex); 134 pcm = snd_pcm_get(card, device); 135 if (pcm == NULL) { 136 err = -ENXIO; 137 goto _error; 138 } 139 pstr = &pcm->streams[stream]; 140 if (pstr->substream_count == 0) { 141 err = -ENOENT; 142 goto _error; 143 } 144 if (subdevice >= pstr->substream_count) { 145 err = -ENXIO; 146 goto _error; 147 } 148 for (substream = pstr->substream; substream; 149 substream = substream->next) 150 if (substream->number == (int)subdevice) 151 break; 152 if (substream == NULL) { 153 err = -ENXIO; 154 goto _error; 155 } 156 err = snd_pcm_info_user(substream, info); 157 _error: 158 mutex_unlock(®ister_mutex); 159 return err; 160 } 161 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 162 { 163 int val; 164 165 if (get_user(val, (int __user *)arg)) 166 return -EFAULT; 167 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val; 168 return 0; 169 } 170 } 171 return -ENOIOCTLCMD; 172 } 173 174 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 175 176 static char *snd_pcm_format_names[] = { 177 FORMAT(S8), 178 FORMAT(U8), 179 FORMAT(S16_LE), 180 FORMAT(S16_BE), 181 FORMAT(U16_LE), 182 FORMAT(U16_BE), 183 FORMAT(S24_LE), 184 FORMAT(S24_BE), 185 FORMAT(U24_LE), 186 FORMAT(U24_BE), 187 FORMAT(S32_LE), 188 FORMAT(S32_BE), 189 FORMAT(U32_LE), 190 FORMAT(U32_BE), 191 FORMAT(FLOAT_LE), 192 FORMAT(FLOAT_BE), 193 FORMAT(FLOAT64_LE), 194 FORMAT(FLOAT64_BE), 195 FORMAT(IEC958_SUBFRAME_LE), 196 FORMAT(IEC958_SUBFRAME_BE), 197 FORMAT(MU_LAW), 198 FORMAT(A_LAW), 199 FORMAT(IMA_ADPCM), 200 FORMAT(MPEG), 201 FORMAT(GSM), 202 FORMAT(SPECIAL), 203 FORMAT(S24_3LE), 204 FORMAT(S24_3BE), 205 FORMAT(U24_3LE), 206 FORMAT(U24_3BE), 207 FORMAT(S20_3LE), 208 FORMAT(S20_3BE), 209 FORMAT(U20_3LE), 210 FORMAT(U20_3BE), 211 FORMAT(S18_3LE), 212 FORMAT(S18_3BE), 213 FORMAT(U18_3LE), 214 FORMAT(U18_3BE), 215 FORMAT(G723_24), 216 FORMAT(G723_24_1B), 217 FORMAT(G723_40), 218 FORMAT(G723_40_1B), 219 FORMAT(DSD_U8), 220 FORMAT(DSD_U16_LE), 221 FORMAT(DSD_U32_LE), 222 FORMAT(DSD_U16_BE), 223 FORMAT(DSD_U32_BE), 224 }; 225 226 /** 227 * snd_pcm_format_name - Return a name string for the given PCM format 228 * @format: PCM format 229 */ 230 const char *snd_pcm_format_name(snd_pcm_format_t format) 231 { 232 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) 233 return "Unknown"; 234 return snd_pcm_format_names[(__force unsigned int)format]; 235 } 236 EXPORT_SYMBOL_GPL(snd_pcm_format_name); 237 238 #ifdef CONFIG_SND_VERBOSE_PROCFS 239 240 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v 241 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 242 #define READY(v) [SNDRV_PCM_READY_##v] = #v 243 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 244 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 245 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 246 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 247 #define START(v) [SNDRV_PCM_START_##v] = #v 248 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 249 250 static char *snd_pcm_stream_names[] = { 251 STREAM(PLAYBACK), 252 STREAM(CAPTURE), 253 }; 254 255 static char *snd_pcm_state_names[] = { 256 STATE(OPEN), 257 STATE(SETUP), 258 STATE(PREPARED), 259 STATE(RUNNING), 260 STATE(XRUN), 261 STATE(DRAINING), 262 STATE(PAUSED), 263 STATE(SUSPENDED), 264 }; 265 266 static char *snd_pcm_access_names[] = { 267 ACCESS(MMAP_INTERLEAVED), 268 ACCESS(MMAP_NONINTERLEAVED), 269 ACCESS(MMAP_COMPLEX), 270 ACCESS(RW_INTERLEAVED), 271 ACCESS(RW_NONINTERLEAVED), 272 }; 273 274 static char *snd_pcm_subformat_names[] = { 275 SUBFORMAT(STD), 276 }; 277 278 static char *snd_pcm_tstamp_mode_names[] = { 279 TSTAMP(NONE), 280 TSTAMP(ENABLE), 281 }; 282 283 static const char *snd_pcm_stream_name(int stream) 284 { 285 return snd_pcm_stream_names[stream]; 286 } 287 288 static const char *snd_pcm_access_name(snd_pcm_access_t access) 289 { 290 return snd_pcm_access_names[(__force int)access]; 291 } 292 293 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 294 { 295 return snd_pcm_subformat_names[(__force int)subformat]; 296 } 297 298 static const char *snd_pcm_tstamp_mode_name(int mode) 299 { 300 return snd_pcm_tstamp_mode_names[mode]; 301 } 302 303 static const char *snd_pcm_state_name(snd_pcm_state_t state) 304 { 305 return snd_pcm_state_names[(__force int)state]; 306 } 307 308 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 309 #include <linux/soundcard.h> 310 311 static const char *snd_pcm_oss_format_name(int format) 312 { 313 switch (format) { 314 case AFMT_MU_LAW: 315 return "MU_LAW"; 316 case AFMT_A_LAW: 317 return "A_LAW"; 318 case AFMT_IMA_ADPCM: 319 return "IMA_ADPCM"; 320 case AFMT_U8: 321 return "U8"; 322 case AFMT_S16_LE: 323 return "S16_LE"; 324 case AFMT_S16_BE: 325 return "S16_BE"; 326 case AFMT_S8: 327 return "S8"; 328 case AFMT_U16_LE: 329 return "U16_LE"; 330 case AFMT_U16_BE: 331 return "U16_BE"; 332 case AFMT_MPEG: 333 return "MPEG"; 334 default: 335 return "unknown"; 336 } 337 } 338 #endif 339 340 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 341 struct snd_info_buffer *buffer) 342 { 343 struct snd_pcm_info *info; 344 int err; 345 346 if (! substream) 347 return; 348 349 info = kmalloc(sizeof(*info), GFP_KERNEL); 350 if (!info) 351 return; 352 353 err = snd_pcm_info(substream, info); 354 if (err < 0) { 355 snd_iprintf(buffer, "error %d\n", err); 356 kfree(info); 357 return; 358 } 359 snd_iprintf(buffer, "card: %d\n", info->card); 360 snd_iprintf(buffer, "device: %d\n", info->device); 361 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 362 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 363 snd_iprintf(buffer, "id: %s\n", info->id); 364 snd_iprintf(buffer, "name: %s\n", info->name); 365 snd_iprintf(buffer, "subname: %s\n", info->subname); 366 snd_iprintf(buffer, "class: %d\n", info->dev_class); 367 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 368 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 369 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 370 kfree(info); 371 } 372 373 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 374 struct snd_info_buffer *buffer) 375 { 376 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 377 buffer); 378 } 379 380 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 381 struct snd_info_buffer *buffer) 382 { 383 snd_pcm_proc_info_read(entry->private_data, buffer); 384 } 385 386 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 387 struct snd_info_buffer *buffer) 388 { 389 struct snd_pcm_substream *substream = entry->private_data; 390 struct snd_pcm_runtime *runtime; 391 392 mutex_lock(&substream->pcm->open_mutex); 393 runtime = substream->runtime; 394 if (!runtime) { 395 snd_iprintf(buffer, "closed\n"); 396 goto unlock; 397 } 398 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 399 snd_iprintf(buffer, "no setup\n"); 400 goto unlock; 401 } 402 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 403 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 404 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 405 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 406 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 407 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 408 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 409 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 410 if (substream->oss.oss) { 411 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 412 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 413 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 414 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 415 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 416 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 417 } 418 #endif 419 unlock: 420 mutex_unlock(&substream->pcm->open_mutex); 421 } 422 423 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 424 struct snd_info_buffer *buffer) 425 { 426 struct snd_pcm_substream *substream = entry->private_data; 427 struct snd_pcm_runtime *runtime; 428 429 mutex_lock(&substream->pcm->open_mutex); 430 runtime = substream->runtime; 431 if (!runtime) { 432 snd_iprintf(buffer, "closed\n"); 433 goto unlock; 434 } 435 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 436 snd_iprintf(buffer, "no setup\n"); 437 goto unlock; 438 } 439 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 440 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 441 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 442 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 443 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 444 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 445 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 446 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 447 unlock: 448 mutex_unlock(&substream->pcm->open_mutex); 449 } 450 451 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 452 struct snd_info_buffer *buffer) 453 { 454 struct snd_pcm_substream *substream = entry->private_data; 455 struct snd_pcm_runtime *runtime; 456 struct snd_pcm_status status; 457 int err; 458 459 mutex_lock(&substream->pcm->open_mutex); 460 runtime = substream->runtime; 461 if (!runtime) { 462 snd_iprintf(buffer, "closed\n"); 463 goto unlock; 464 } 465 memset(&status, 0, sizeof(status)); 466 err = snd_pcm_status(substream, &status); 467 if (err < 0) { 468 snd_iprintf(buffer, "error %d\n", err); 469 goto unlock; 470 } 471 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 472 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); 473 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 474 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 475 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 476 status.tstamp.tv_sec, status.tstamp.tv_nsec); 477 snd_iprintf(buffer, "delay : %ld\n", status.delay); 478 snd_iprintf(buffer, "avail : %ld\n", status.avail); 479 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 480 snd_iprintf(buffer, "-----\n"); 481 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 482 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 483 unlock: 484 mutex_unlock(&substream->pcm->open_mutex); 485 } 486 487 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 488 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry, 489 struct snd_info_buffer *buffer) 490 { 491 struct snd_pcm_substream *substream = entry->private_data; 492 struct snd_pcm_runtime *runtime; 493 494 snd_pcm_stream_lock_irq(substream); 495 runtime = substream->runtime; 496 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING) 497 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 498 snd_pcm_stream_unlock_irq(substream); 499 } 500 501 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 502 struct snd_info_buffer *buffer) 503 { 504 struct snd_pcm_str *pstr = entry->private_data; 505 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 506 } 507 508 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 509 struct snd_info_buffer *buffer) 510 { 511 struct snd_pcm_str *pstr = entry->private_data; 512 char line[64]; 513 if (!snd_info_get_line(buffer, line, sizeof(line))) 514 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 515 } 516 #endif 517 518 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 519 { 520 struct snd_pcm *pcm = pstr->pcm; 521 struct snd_info_entry *entry; 522 char name[16]; 523 524 sprintf(name, "pcm%i%c", pcm->device, 525 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 526 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 527 return -ENOMEM; 528 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 529 if (snd_info_register(entry) < 0) { 530 snd_info_free_entry(entry); 531 return -ENOMEM; 532 } 533 pstr->proc_root = entry; 534 535 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 536 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); 537 if (snd_info_register(entry) < 0) { 538 snd_info_free_entry(entry); 539 entry = NULL; 540 } 541 } 542 pstr->proc_info_entry = entry; 543 544 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 545 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 546 pstr->proc_root)) != NULL) { 547 entry->c.text.read = snd_pcm_xrun_debug_read; 548 entry->c.text.write = snd_pcm_xrun_debug_write; 549 entry->mode |= S_IWUSR; 550 entry->private_data = pstr; 551 if (snd_info_register(entry) < 0) { 552 snd_info_free_entry(entry); 553 entry = NULL; 554 } 555 } 556 pstr->proc_xrun_debug_entry = entry; 557 #endif 558 return 0; 559 } 560 561 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 562 { 563 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 564 snd_info_free_entry(pstr->proc_xrun_debug_entry); 565 pstr->proc_xrun_debug_entry = NULL; 566 #endif 567 snd_info_free_entry(pstr->proc_info_entry); 568 pstr->proc_info_entry = NULL; 569 snd_info_free_entry(pstr->proc_root); 570 pstr->proc_root = NULL; 571 return 0; 572 } 573 574 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 575 { 576 struct snd_info_entry *entry; 577 struct snd_card *card; 578 char name[16]; 579 580 card = substream->pcm->card; 581 582 sprintf(name, "sub%i", substream->number); 583 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 584 return -ENOMEM; 585 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 586 if (snd_info_register(entry) < 0) { 587 snd_info_free_entry(entry); 588 return -ENOMEM; 589 } 590 substream->proc_root = entry; 591 592 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 593 snd_info_set_text_ops(entry, substream, 594 snd_pcm_substream_proc_info_read); 595 if (snd_info_register(entry) < 0) { 596 snd_info_free_entry(entry); 597 entry = NULL; 598 } 599 } 600 substream->proc_info_entry = entry; 601 602 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 603 snd_info_set_text_ops(entry, substream, 604 snd_pcm_substream_proc_hw_params_read); 605 if (snd_info_register(entry) < 0) { 606 snd_info_free_entry(entry); 607 entry = NULL; 608 } 609 } 610 substream->proc_hw_params_entry = entry; 611 612 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 613 snd_info_set_text_ops(entry, substream, 614 snd_pcm_substream_proc_sw_params_read); 615 if (snd_info_register(entry) < 0) { 616 snd_info_free_entry(entry); 617 entry = NULL; 618 } 619 } 620 substream->proc_sw_params_entry = entry; 621 622 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 623 snd_info_set_text_ops(entry, substream, 624 snd_pcm_substream_proc_status_read); 625 if (snd_info_register(entry) < 0) { 626 snd_info_free_entry(entry); 627 entry = NULL; 628 } 629 } 630 substream->proc_status_entry = entry; 631 632 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 633 entry = snd_info_create_card_entry(card, "xrun_injection", 634 substream->proc_root); 635 if (entry) { 636 entry->private_data = substream; 637 entry->c.text.read = NULL; 638 entry->c.text.write = snd_pcm_xrun_injection_write; 639 entry->mode = S_IFREG | S_IWUSR; 640 if (snd_info_register(entry) < 0) { 641 snd_info_free_entry(entry); 642 entry = NULL; 643 } 644 } 645 substream->proc_xrun_injection_entry = entry; 646 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */ 647 648 return 0; 649 } 650 651 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 652 { 653 snd_info_free_entry(substream->proc_info_entry); 654 substream->proc_info_entry = NULL; 655 snd_info_free_entry(substream->proc_hw_params_entry); 656 substream->proc_hw_params_entry = NULL; 657 snd_info_free_entry(substream->proc_sw_params_entry); 658 substream->proc_sw_params_entry = NULL; 659 snd_info_free_entry(substream->proc_status_entry); 660 substream->proc_status_entry = NULL; 661 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 662 snd_info_free_entry(substream->proc_xrun_injection_entry); 663 substream->proc_xrun_injection_entry = NULL; 664 #endif 665 snd_info_free_entry(substream->proc_root); 666 substream->proc_root = NULL; 667 return 0; 668 } 669 #else /* !CONFIG_SND_VERBOSE_PROCFS */ 670 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 671 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 672 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 673 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 674 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 675 676 static const struct attribute_group *pcm_dev_attr_groups[]; 677 678 /** 679 * snd_pcm_new_stream - create a new PCM stream 680 * @pcm: the pcm instance 681 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 682 * @substream_count: the number of substreams 683 * 684 * Creates a new stream for the pcm. 685 * The corresponding stream on the pcm must have been empty before 686 * calling this, i.e. zero must be given to the argument of 687 * snd_pcm_new(). 688 * 689 * Return: Zero if successful, or a negative error code on failure. 690 */ 691 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 692 { 693 int idx, err; 694 struct snd_pcm_str *pstr = &pcm->streams[stream]; 695 struct snd_pcm_substream *substream, *prev; 696 697 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 698 mutex_init(&pstr->oss.setup_mutex); 699 #endif 700 pstr->stream = stream; 701 pstr->pcm = pcm; 702 pstr->substream_count = substream_count; 703 if (!substream_count) 704 return 0; 705 706 snd_device_initialize(&pstr->dev, pcm->card); 707 pstr->dev.groups = pcm_dev_attr_groups; 708 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device, 709 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 710 711 if (!pcm->internal) { 712 err = snd_pcm_stream_proc_init(pstr); 713 if (err < 0) { 714 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n"); 715 return err; 716 } 717 } 718 prev = NULL; 719 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 720 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 721 if (!substream) 722 return -ENOMEM; 723 substream->pcm = pcm; 724 substream->pstr = pstr; 725 substream->number = idx; 726 substream->stream = stream; 727 sprintf(substream->name, "subdevice #%i", idx); 728 substream->buffer_bytes_max = UINT_MAX; 729 if (prev == NULL) 730 pstr->substream = substream; 731 else 732 prev->next = substream; 733 734 if (!pcm->internal) { 735 err = snd_pcm_substream_proc_init(substream); 736 if (err < 0) { 737 pcm_err(pcm, 738 "Error in snd_pcm_stream_proc_init\n"); 739 if (prev == NULL) 740 pstr->substream = NULL; 741 else 742 prev->next = NULL; 743 kfree(substream); 744 return err; 745 } 746 } 747 substream->group = &substream->self_group; 748 spin_lock_init(&substream->self_group.lock); 749 mutex_init(&substream->self_group.mutex); 750 INIT_LIST_HEAD(&substream->self_group.substreams); 751 list_add_tail(&substream->link_list, &substream->self_group.substreams); 752 atomic_set(&substream->mmap_count, 0); 753 prev = substream; 754 } 755 return 0; 756 } 757 EXPORT_SYMBOL(snd_pcm_new_stream); 758 759 static int _snd_pcm_new(struct snd_card *card, const char *id, int device, 760 int playback_count, int capture_count, bool internal, 761 struct snd_pcm **rpcm) 762 { 763 struct snd_pcm *pcm; 764 int err; 765 static struct snd_device_ops ops = { 766 .dev_free = snd_pcm_dev_free, 767 .dev_register = snd_pcm_dev_register, 768 .dev_disconnect = snd_pcm_dev_disconnect, 769 }; 770 771 if (snd_BUG_ON(!card)) 772 return -ENXIO; 773 if (rpcm) 774 *rpcm = NULL; 775 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 776 if (!pcm) 777 return -ENOMEM; 778 pcm->card = card; 779 pcm->device = device; 780 pcm->internal = internal; 781 mutex_init(&pcm->open_mutex); 782 init_waitqueue_head(&pcm->open_wait); 783 INIT_LIST_HEAD(&pcm->list); 784 if (id) 785 strlcpy(pcm->id, id, sizeof(pcm->id)); 786 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 787 snd_pcm_free(pcm); 788 return err; 789 } 790 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 791 snd_pcm_free(pcm); 792 return err; 793 } 794 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 795 snd_pcm_free(pcm); 796 return err; 797 } 798 if (rpcm) 799 *rpcm = pcm; 800 return 0; 801 } 802 803 /** 804 * snd_pcm_new - create a new PCM instance 805 * @card: the card instance 806 * @id: the id string 807 * @device: the device index (zero based) 808 * @playback_count: the number of substreams for playback 809 * @capture_count: the number of substreams for capture 810 * @rpcm: the pointer to store the new pcm instance 811 * 812 * Creates a new PCM instance. 813 * 814 * The pcm operators have to be set afterwards to the new instance 815 * via snd_pcm_set_ops(). 816 * 817 * Return: Zero if successful, or a negative error code on failure. 818 */ 819 int snd_pcm_new(struct snd_card *card, const char *id, int device, 820 int playback_count, int capture_count, struct snd_pcm **rpcm) 821 { 822 return _snd_pcm_new(card, id, device, playback_count, capture_count, 823 false, rpcm); 824 } 825 EXPORT_SYMBOL(snd_pcm_new); 826 827 /** 828 * snd_pcm_new_internal - create a new internal PCM instance 829 * @card: the card instance 830 * @id: the id string 831 * @device: the device index (zero based - shared with normal PCMs) 832 * @playback_count: the number of substreams for playback 833 * @capture_count: the number of substreams for capture 834 * @rpcm: the pointer to store the new pcm instance 835 * 836 * Creates a new internal PCM instance with no userspace device or procfs 837 * entries. This is used by ASoC Back End PCMs in order to create a PCM that 838 * will only be used internally by kernel drivers. i.e. it cannot be opened 839 * by userspace. It provides existing ASoC components drivers with a substream 840 * and access to any private data. 841 * 842 * The pcm operators have to be set afterwards to the new instance 843 * via snd_pcm_set_ops(). 844 * 845 * Return: Zero if successful, or a negative error code on failure. 846 */ 847 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 848 int playback_count, int capture_count, 849 struct snd_pcm **rpcm) 850 { 851 return _snd_pcm_new(card, id, device, playback_count, capture_count, 852 true, rpcm); 853 } 854 EXPORT_SYMBOL(snd_pcm_new_internal); 855 856 static void free_chmap(struct snd_pcm_str *pstr) 857 { 858 if (pstr->chmap_kctl) { 859 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl); 860 pstr->chmap_kctl = NULL; 861 } 862 } 863 864 static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 865 { 866 struct snd_pcm_substream *substream, *substream_next; 867 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 868 struct snd_pcm_oss_setup *setup, *setupn; 869 #endif 870 substream = pstr->substream; 871 while (substream) { 872 substream_next = substream->next; 873 snd_pcm_timer_done(substream); 874 snd_pcm_substream_proc_done(substream); 875 kfree(substream); 876 substream = substream_next; 877 } 878 snd_pcm_stream_proc_done(pstr); 879 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 880 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 881 setupn = setup->next; 882 kfree(setup->task_name); 883 kfree(setup); 884 } 885 #endif 886 free_chmap(pstr); 887 if (pstr->substream_count) 888 put_device(&pstr->dev); 889 } 890 891 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 892 #define pcm_call_notify(pcm, call) \ 893 do { \ 894 struct snd_pcm_notify *_notify; \ 895 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \ 896 _notify->call(pcm); \ 897 } while (0) 898 #else 899 #define pcm_call_notify(pcm, call) do {} while (0) 900 #endif 901 902 static int snd_pcm_free(struct snd_pcm *pcm) 903 { 904 if (!pcm) 905 return 0; 906 if (!pcm->internal) 907 pcm_call_notify(pcm, n_unregister); 908 if (pcm->private_free) 909 pcm->private_free(pcm); 910 snd_pcm_lib_preallocate_free_for_all(pcm); 911 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 912 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 913 kfree(pcm); 914 return 0; 915 } 916 917 static int snd_pcm_dev_free(struct snd_device *device) 918 { 919 struct snd_pcm *pcm = device->device_data; 920 return snd_pcm_free(pcm); 921 } 922 923 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 924 struct file *file, 925 struct snd_pcm_substream **rsubstream) 926 { 927 struct snd_pcm_str * pstr; 928 struct snd_pcm_substream *substream; 929 struct snd_pcm_runtime *runtime; 930 struct snd_card *card; 931 int prefer_subdevice; 932 size_t size; 933 934 if (snd_BUG_ON(!pcm || !rsubstream)) 935 return -ENXIO; 936 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK && 937 stream != SNDRV_PCM_STREAM_CAPTURE)) 938 return -EINVAL; 939 *rsubstream = NULL; 940 pstr = &pcm->streams[stream]; 941 if (pstr->substream == NULL || pstr->substream_count == 0) 942 return -ENODEV; 943 944 card = pcm->card; 945 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM); 946 947 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 948 int opposite = !stream; 949 950 for (substream = pcm->streams[opposite].substream; substream; 951 substream = substream->next) { 952 if (SUBSTREAM_BUSY(substream)) 953 return -EAGAIN; 954 } 955 } 956 957 if (file->f_flags & O_APPEND) { 958 if (prefer_subdevice < 0) { 959 if (pstr->substream_count > 1) 960 return -EINVAL; /* must be unique */ 961 substream = pstr->substream; 962 } else { 963 for (substream = pstr->substream; substream; 964 substream = substream->next) 965 if (substream->number == prefer_subdevice) 966 break; 967 } 968 if (! substream) 969 return -ENODEV; 970 if (! SUBSTREAM_BUSY(substream)) 971 return -EBADFD; 972 substream->ref_count++; 973 *rsubstream = substream; 974 return 0; 975 } 976 977 for (substream = pstr->substream; substream; substream = substream->next) { 978 if (!SUBSTREAM_BUSY(substream) && 979 (prefer_subdevice == -1 || 980 substream->number == prefer_subdevice)) 981 break; 982 } 983 if (substream == NULL) 984 return -EAGAIN; 985 986 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 987 if (runtime == NULL) 988 return -ENOMEM; 989 990 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 991 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 992 if (runtime->status == NULL) { 993 kfree(runtime); 994 return -ENOMEM; 995 } 996 memset((void*)runtime->status, 0, size); 997 998 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 999 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 1000 if (runtime->control == NULL) { 1001 snd_free_pages((void*)runtime->status, 1002 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 1003 kfree(runtime); 1004 return -ENOMEM; 1005 } 1006 memset((void*)runtime->control, 0, size); 1007 1008 init_waitqueue_head(&runtime->sleep); 1009 init_waitqueue_head(&runtime->tsleep); 1010 1011 runtime->status->state = SNDRV_PCM_STATE_OPEN; 1012 1013 substream->runtime = runtime; 1014 substream->private_data = pcm->private_data; 1015 substream->ref_count = 1; 1016 substream->f_flags = file->f_flags; 1017 substream->pid = get_pid(task_pid(current)); 1018 pstr->substream_opened++; 1019 *rsubstream = substream; 1020 return 0; 1021 } 1022 1023 void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 1024 { 1025 struct snd_pcm_runtime *runtime; 1026 1027 if (PCM_RUNTIME_CHECK(substream)) 1028 return; 1029 runtime = substream->runtime; 1030 if (runtime->private_free != NULL) 1031 runtime->private_free(runtime); 1032 snd_free_pages((void*)runtime->status, 1033 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 1034 snd_free_pages((void*)runtime->control, 1035 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 1036 kfree(runtime->hw_constraints.rules); 1037 kfree(runtime); 1038 substream->runtime = NULL; 1039 put_pid(substream->pid); 1040 substream->pid = NULL; 1041 substream->pstr->substream_opened--; 1042 } 1043 1044 static ssize_t show_pcm_class(struct device *dev, 1045 struct device_attribute *attr, char *buf) 1046 { 1047 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev); 1048 struct snd_pcm *pcm = pstr->pcm; 1049 const char *str; 1050 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 1051 [SNDRV_PCM_CLASS_GENERIC] = "generic", 1052 [SNDRV_PCM_CLASS_MULTI] = "multi", 1053 [SNDRV_PCM_CLASS_MODEM] = "modem", 1054 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 1055 }; 1056 1057 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST) 1058 str = "none"; 1059 else 1060 str = strs[pcm->dev_class]; 1061 return snprintf(buf, PAGE_SIZE, "%s\n", str); 1062 } 1063 1064 static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); 1065 static struct attribute *pcm_dev_attrs[] = { 1066 &dev_attr_pcm_class.attr, 1067 NULL 1068 }; 1069 1070 static const struct attribute_group pcm_dev_attr_group = { 1071 .attrs = pcm_dev_attrs, 1072 }; 1073 1074 static const struct attribute_group *pcm_dev_attr_groups[] = { 1075 &pcm_dev_attr_group, 1076 NULL 1077 }; 1078 1079 static int snd_pcm_dev_register(struct snd_device *device) 1080 { 1081 int cidx, err; 1082 struct snd_pcm_substream *substream; 1083 struct snd_pcm *pcm; 1084 1085 if (snd_BUG_ON(!device || !device->device_data)) 1086 return -ENXIO; 1087 pcm = device->device_data; 1088 if (pcm->internal) 1089 return 0; 1090 1091 mutex_lock(®ister_mutex); 1092 err = snd_pcm_add(pcm); 1093 if (err) 1094 goto unlock; 1095 for (cidx = 0; cidx < 2; cidx++) { 1096 int devtype = -1; 1097 if (pcm->streams[cidx].substream == NULL) 1098 continue; 1099 switch (cidx) { 1100 case SNDRV_PCM_STREAM_PLAYBACK: 1101 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1102 break; 1103 case SNDRV_PCM_STREAM_CAPTURE: 1104 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1105 break; 1106 } 1107 /* register pcm */ 1108 err = snd_register_device(devtype, pcm->card, pcm->device, 1109 &snd_pcm_f_ops[cidx], pcm, 1110 &pcm->streams[cidx].dev); 1111 if (err < 0) { 1112 list_del_init(&pcm->list); 1113 goto unlock; 1114 } 1115 1116 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1117 snd_pcm_timer_init(substream); 1118 } 1119 1120 pcm_call_notify(pcm, n_register); 1121 1122 unlock: 1123 mutex_unlock(®ister_mutex); 1124 return err; 1125 } 1126 1127 static int snd_pcm_dev_disconnect(struct snd_device *device) 1128 { 1129 struct snd_pcm *pcm = device->device_data; 1130 struct snd_pcm_substream *substream; 1131 int cidx; 1132 1133 mutex_lock(®ister_mutex); 1134 mutex_lock(&pcm->open_mutex); 1135 wake_up(&pcm->open_wait); 1136 list_del_init(&pcm->list); 1137 for (cidx = 0; cidx < 2; cidx++) { 1138 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { 1139 snd_pcm_stream_lock_irq(substream); 1140 if (substream->runtime) { 1141 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1142 wake_up(&substream->runtime->sleep); 1143 wake_up(&substream->runtime->tsleep); 1144 } 1145 snd_pcm_stream_unlock_irq(substream); 1146 } 1147 } 1148 if (!pcm->internal) { 1149 pcm_call_notify(pcm, n_disconnect); 1150 } 1151 for (cidx = 0; cidx < 2; cidx++) { 1152 if (!pcm->internal) 1153 snd_unregister_device(&pcm->streams[cidx].dev); 1154 free_chmap(&pcm->streams[cidx]); 1155 } 1156 mutex_unlock(&pcm->open_mutex); 1157 mutex_unlock(®ister_mutex); 1158 return 0; 1159 } 1160 1161 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 1162 /** 1163 * snd_pcm_notify - Add/remove the notify list 1164 * @notify: PCM notify list 1165 * @nfree: 0 = register, 1 = unregister 1166 * 1167 * This adds the given notifier to the global list so that the callback is 1168 * called for each registered PCM devices. This exists only for PCM OSS 1169 * emulation, so far. 1170 */ 1171 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1172 { 1173 struct snd_pcm *pcm; 1174 1175 if (snd_BUG_ON(!notify || 1176 !notify->n_register || 1177 !notify->n_unregister || 1178 !notify->n_disconnect)) 1179 return -EINVAL; 1180 mutex_lock(®ister_mutex); 1181 if (nfree) { 1182 list_del(¬ify->list); 1183 list_for_each_entry(pcm, &snd_pcm_devices, list) 1184 notify->n_unregister(pcm); 1185 } else { 1186 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1187 list_for_each_entry(pcm, &snd_pcm_devices, list) 1188 notify->n_register(pcm); 1189 } 1190 mutex_unlock(®ister_mutex); 1191 return 0; 1192 } 1193 EXPORT_SYMBOL(snd_pcm_notify); 1194 #endif /* CONFIG_SND_PCM_OSS */ 1195 1196 #ifdef CONFIG_SND_PROC_FS 1197 /* 1198 * Info interface 1199 */ 1200 1201 static void snd_pcm_proc_read(struct snd_info_entry *entry, 1202 struct snd_info_buffer *buffer) 1203 { 1204 struct snd_pcm *pcm; 1205 1206 mutex_lock(®ister_mutex); 1207 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1208 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1209 pcm->card->number, pcm->device, pcm->id, pcm->name); 1210 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1211 snd_iprintf(buffer, " : playback %i", 1212 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1213 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1214 snd_iprintf(buffer, " : capture %i", 1215 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1216 snd_iprintf(buffer, "\n"); 1217 } 1218 mutex_unlock(®ister_mutex); 1219 } 1220 1221 static struct snd_info_entry *snd_pcm_proc_entry; 1222 1223 static void snd_pcm_proc_init(void) 1224 { 1225 struct snd_info_entry *entry; 1226 1227 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1228 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1229 if (snd_info_register(entry) < 0) { 1230 snd_info_free_entry(entry); 1231 entry = NULL; 1232 } 1233 } 1234 snd_pcm_proc_entry = entry; 1235 } 1236 1237 static void snd_pcm_proc_done(void) 1238 { 1239 snd_info_free_entry(snd_pcm_proc_entry); 1240 } 1241 1242 #else /* !CONFIG_SND_PROC_FS */ 1243 #define snd_pcm_proc_init() 1244 #define snd_pcm_proc_done() 1245 #endif /* CONFIG_SND_PROC_FS */ 1246 1247 1248 /* 1249 * ENTRY functions 1250 */ 1251 1252 static int __init alsa_pcm_init(void) 1253 { 1254 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1255 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1256 snd_pcm_proc_init(); 1257 return 0; 1258 } 1259 1260 static void __exit alsa_pcm_exit(void) 1261 { 1262 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1263 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1264 snd_pcm_proc_done(); 1265 } 1266 1267 module_init(alsa_pcm_init) 1268 module_exit(alsa_pcm_exit) 1269