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 mutex_lock(&pcm->open_mutex); 157 err = snd_pcm_info_user(substream, info); 158 mutex_unlock(&pcm->open_mutex); 159 _error: 160 mutex_unlock(®ister_mutex); 161 return err; 162 } 163 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 164 { 165 int val; 166 167 if (get_user(val, (int __user *)arg)) 168 return -EFAULT; 169 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val; 170 return 0; 171 } 172 } 173 return -ENOIOCTLCMD; 174 } 175 176 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 177 178 static char *snd_pcm_format_names[] = { 179 FORMAT(S8), 180 FORMAT(U8), 181 FORMAT(S16_LE), 182 FORMAT(S16_BE), 183 FORMAT(U16_LE), 184 FORMAT(U16_BE), 185 FORMAT(S24_LE), 186 FORMAT(S24_BE), 187 FORMAT(U24_LE), 188 FORMAT(U24_BE), 189 FORMAT(S32_LE), 190 FORMAT(S32_BE), 191 FORMAT(U32_LE), 192 FORMAT(U32_BE), 193 FORMAT(FLOAT_LE), 194 FORMAT(FLOAT_BE), 195 FORMAT(FLOAT64_LE), 196 FORMAT(FLOAT64_BE), 197 FORMAT(IEC958_SUBFRAME_LE), 198 FORMAT(IEC958_SUBFRAME_BE), 199 FORMAT(MU_LAW), 200 FORMAT(A_LAW), 201 FORMAT(IMA_ADPCM), 202 FORMAT(MPEG), 203 FORMAT(GSM), 204 FORMAT(SPECIAL), 205 FORMAT(S24_3LE), 206 FORMAT(S24_3BE), 207 FORMAT(U24_3LE), 208 FORMAT(U24_3BE), 209 FORMAT(S20_3LE), 210 FORMAT(S20_3BE), 211 FORMAT(U20_3LE), 212 FORMAT(U20_3BE), 213 FORMAT(S18_3LE), 214 FORMAT(S18_3BE), 215 FORMAT(U18_3LE), 216 FORMAT(U18_3BE), 217 FORMAT(G723_24), 218 FORMAT(G723_24_1B), 219 FORMAT(G723_40), 220 FORMAT(G723_40_1B), 221 FORMAT(DSD_U8), 222 FORMAT(DSD_U16_LE), 223 FORMAT(DSD_U32_LE), 224 FORMAT(DSD_U16_BE), 225 FORMAT(DSD_U32_BE), 226 }; 227 228 /** 229 * snd_pcm_format_name - Return a name string for the given PCM format 230 * @format: PCM format 231 */ 232 const char *snd_pcm_format_name(snd_pcm_format_t format) 233 { 234 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) 235 return "Unknown"; 236 return snd_pcm_format_names[(__force unsigned int)format]; 237 } 238 EXPORT_SYMBOL_GPL(snd_pcm_format_name); 239 240 #ifdef CONFIG_SND_VERBOSE_PROCFS 241 242 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v 243 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 244 #define READY(v) [SNDRV_PCM_READY_##v] = #v 245 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 246 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 247 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 248 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 249 #define START(v) [SNDRV_PCM_START_##v] = #v 250 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 251 252 static char *snd_pcm_stream_names[] = { 253 STREAM(PLAYBACK), 254 STREAM(CAPTURE), 255 }; 256 257 static char *snd_pcm_state_names[] = { 258 STATE(OPEN), 259 STATE(SETUP), 260 STATE(PREPARED), 261 STATE(RUNNING), 262 STATE(XRUN), 263 STATE(DRAINING), 264 STATE(PAUSED), 265 STATE(SUSPENDED), 266 }; 267 268 static char *snd_pcm_access_names[] = { 269 ACCESS(MMAP_INTERLEAVED), 270 ACCESS(MMAP_NONINTERLEAVED), 271 ACCESS(MMAP_COMPLEX), 272 ACCESS(RW_INTERLEAVED), 273 ACCESS(RW_NONINTERLEAVED), 274 }; 275 276 static char *snd_pcm_subformat_names[] = { 277 SUBFORMAT(STD), 278 }; 279 280 static char *snd_pcm_tstamp_mode_names[] = { 281 TSTAMP(NONE), 282 TSTAMP(ENABLE), 283 }; 284 285 static const char *snd_pcm_stream_name(int stream) 286 { 287 return snd_pcm_stream_names[stream]; 288 } 289 290 static const char *snd_pcm_access_name(snd_pcm_access_t access) 291 { 292 return snd_pcm_access_names[(__force int)access]; 293 } 294 295 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 296 { 297 return snd_pcm_subformat_names[(__force int)subformat]; 298 } 299 300 static const char *snd_pcm_tstamp_mode_name(int mode) 301 { 302 return snd_pcm_tstamp_mode_names[mode]; 303 } 304 305 static const char *snd_pcm_state_name(snd_pcm_state_t state) 306 { 307 return snd_pcm_state_names[(__force int)state]; 308 } 309 310 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 311 #include <linux/soundcard.h> 312 313 static const char *snd_pcm_oss_format_name(int format) 314 { 315 switch (format) { 316 case AFMT_MU_LAW: 317 return "MU_LAW"; 318 case AFMT_A_LAW: 319 return "A_LAW"; 320 case AFMT_IMA_ADPCM: 321 return "IMA_ADPCM"; 322 case AFMT_U8: 323 return "U8"; 324 case AFMT_S16_LE: 325 return "S16_LE"; 326 case AFMT_S16_BE: 327 return "S16_BE"; 328 case AFMT_S8: 329 return "S8"; 330 case AFMT_U16_LE: 331 return "U16_LE"; 332 case AFMT_U16_BE: 333 return "U16_BE"; 334 case AFMT_MPEG: 335 return "MPEG"; 336 default: 337 return "unknown"; 338 } 339 } 340 #endif 341 342 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 343 struct snd_info_buffer *buffer) 344 { 345 struct snd_pcm_info *info; 346 int err; 347 348 if (! substream) 349 return; 350 351 info = kmalloc(sizeof(*info), GFP_KERNEL); 352 if (!info) 353 return; 354 355 err = snd_pcm_info(substream, info); 356 if (err < 0) { 357 snd_iprintf(buffer, "error %d\n", err); 358 kfree(info); 359 return; 360 } 361 snd_iprintf(buffer, "card: %d\n", info->card); 362 snd_iprintf(buffer, "device: %d\n", info->device); 363 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 364 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 365 snd_iprintf(buffer, "id: %s\n", info->id); 366 snd_iprintf(buffer, "name: %s\n", info->name); 367 snd_iprintf(buffer, "subname: %s\n", info->subname); 368 snd_iprintf(buffer, "class: %d\n", info->dev_class); 369 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 370 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 371 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 372 kfree(info); 373 } 374 375 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 376 struct snd_info_buffer *buffer) 377 { 378 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 379 buffer); 380 } 381 382 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 383 struct snd_info_buffer *buffer) 384 { 385 snd_pcm_proc_info_read(entry->private_data, buffer); 386 } 387 388 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 389 struct snd_info_buffer *buffer) 390 { 391 struct snd_pcm_substream *substream = entry->private_data; 392 struct snd_pcm_runtime *runtime; 393 394 mutex_lock(&substream->pcm->open_mutex); 395 runtime = substream->runtime; 396 if (!runtime) { 397 snd_iprintf(buffer, "closed\n"); 398 goto unlock; 399 } 400 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 401 snd_iprintf(buffer, "no setup\n"); 402 goto unlock; 403 } 404 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 405 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 406 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 407 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 408 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 409 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 410 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 411 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 412 if (substream->oss.oss) { 413 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 414 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 415 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 416 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 417 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 418 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 419 } 420 #endif 421 unlock: 422 mutex_unlock(&substream->pcm->open_mutex); 423 } 424 425 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 426 struct snd_info_buffer *buffer) 427 { 428 struct snd_pcm_substream *substream = entry->private_data; 429 struct snd_pcm_runtime *runtime; 430 431 mutex_lock(&substream->pcm->open_mutex); 432 runtime = substream->runtime; 433 if (!runtime) { 434 snd_iprintf(buffer, "closed\n"); 435 goto unlock; 436 } 437 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 438 snd_iprintf(buffer, "no setup\n"); 439 goto unlock; 440 } 441 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 442 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 443 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 444 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 445 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 446 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 447 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 448 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 449 unlock: 450 mutex_unlock(&substream->pcm->open_mutex); 451 } 452 453 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 454 struct snd_info_buffer *buffer) 455 { 456 struct snd_pcm_substream *substream = entry->private_data; 457 struct snd_pcm_runtime *runtime; 458 struct snd_pcm_status status; 459 int err; 460 461 mutex_lock(&substream->pcm->open_mutex); 462 runtime = substream->runtime; 463 if (!runtime) { 464 snd_iprintf(buffer, "closed\n"); 465 goto unlock; 466 } 467 memset(&status, 0, sizeof(status)); 468 err = snd_pcm_status(substream, &status); 469 if (err < 0) { 470 snd_iprintf(buffer, "error %d\n", err); 471 goto unlock; 472 } 473 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 474 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); 475 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 476 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 477 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 478 status.tstamp.tv_sec, status.tstamp.tv_nsec); 479 snd_iprintf(buffer, "delay : %ld\n", status.delay); 480 snd_iprintf(buffer, "avail : %ld\n", status.avail); 481 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 482 snd_iprintf(buffer, "-----\n"); 483 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 484 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 485 unlock: 486 mutex_unlock(&substream->pcm->open_mutex); 487 } 488 489 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 490 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry, 491 struct snd_info_buffer *buffer) 492 { 493 struct snd_pcm_substream *substream = entry->private_data; 494 struct snd_pcm_runtime *runtime; 495 496 snd_pcm_stream_lock_irq(substream); 497 runtime = substream->runtime; 498 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING) 499 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 500 snd_pcm_stream_unlock_irq(substream); 501 } 502 503 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 504 struct snd_info_buffer *buffer) 505 { 506 struct snd_pcm_str *pstr = entry->private_data; 507 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 508 } 509 510 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 511 struct snd_info_buffer *buffer) 512 { 513 struct snd_pcm_str *pstr = entry->private_data; 514 char line[64]; 515 if (!snd_info_get_line(buffer, line, sizeof(line))) 516 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 517 } 518 #endif 519 520 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 521 { 522 struct snd_pcm *pcm = pstr->pcm; 523 struct snd_info_entry *entry; 524 char name[16]; 525 526 sprintf(name, "pcm%i%c", pcm->device, 527 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 528 entry = snd_info_create_card_entry(pcm->card, name, 529 pcm->card->proc_root); 530 if (!entry) 531 return -ENOMEM; 532 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 533 if (snd_info_register(entry) < 0) { 534 snd_info_free_entry(entry); 535 return -ENOMEM; 536 } 537 pstr->proc_root = entry; 538 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root); 539 if (entry) { 540 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); 541 if (snd_info_register(entry) < 0) { 542 snd_info_free_entry(entry); 543 entry = NULL; 544 } 545 } 546 pstr->proc_info_entry = entry; 547 548 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 549 entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 550 pstr->proc_root); 551 if (entry) { 552 entry->c.text.read = snd_pcm_xrun_debug_read; 553 entry->c.text.write = snd_pcm_xrun_debug_write; 554 entry->mode |= S_IWUSR; 555 entry->private_data = pstr; 556 if (snd_info_register(entry) < 0) { 557 snd_info_free_entry(entry); 558 entry = NULL; 559 } 560 } 561 pstr->proc_xrun_debug_entry = entry; 562 #endif 563 return 0; 564 } 565 566 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 567 { 568 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 569 snd_info_free_entry(pstr->proc_xrun_debug_entry); 570 pstr->proc_xrun_debug_entry = NULL; 571 #endif 572 snd_info_free_entry(pstr->proc_info_entry); 573 pstr->proc_info_entry = NULL; 574 snd_info_free_entry(pstr->proc_root); 575 pstr->proc_root = NULL; 576 return 0; 577 } 578 579 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 580 { 581 struct snd_info_entry *entry; 582 struct snd_card *card; 583 char name[16]; 584 585 card = substream->pcm->card; 586 587 sprintf(name, "sub%i", substream->number); 588 entry = snd_info_create_card_entry(card, name, 589 substream->pstr->proc_root); 590 if (!entry) 591 return -ENOMEM; 592 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 593 if (snd_info_register(entry) < 0) { 594 snd_info_free_entry(entry); 595 return -ENOMEM; 596 } 597 substream->proc_root = entry; 598 entry = snd_info_create_card_entry(card, "info", substream->proc_root); 599 if (entry) { 600 snd_info_set_text_ops(entry, substream, 601 snd_pcm_substream_proc_info_read); 602 if (snd_info_register(entry) < 0) { 603 snd_info_free_entry(entry); 604 entry = NULL; 605 } 606 } 607 substream->proc_info_entry = entry; 608 entry = snd_info_create_card_entry(card, "hw_params", 609 substream->proc_root); 610 if (entry) { 611 snd_info_set_text_ops(entry, substream, 612 snd_pcm_substream_proc_hw_params_read); 613 if (snd_info_register(entry) < 0) { 614 snd_info_free_entry(entry); 615 entry = NULL; 616 } 617 } 618 substream->proc_hw_params_entry = entry; 619 entry = snd_info_create_card_entry(card, "sw_params", 620 substream->proc_root); 621 if (entry) { 622 snd_info_set_text_ops(entry, substream, 623 snd_pcm_substream_proc_sw_params_read); 624 if (snd_info_register(entry) < 0) { 625 snd_info_free_entry(entry); 626 entry = NULL; 627 } 628 } 629 substream->proc_sw_params_entry = entry; 630 entry = snd_info_create_card_entry(card, "status", 631 substream->proc_root); 632 if (entry) { 633 snd_info_set_text_ops(entry, substream, 634 snd_pcm_substream_proc_status_read); 635 if (snd_info_register(entry) < 0) { 636 snd_info_free_entry(entry); 637 entry = NULL; 638 } 639 } 640 substream->proc_status_entry = entry; 641 642 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 643 entry = snd_info_create_card_entry(card, "xrun_injection", 644 substream->proc_root); 645 if (entry) { 646 entry->private_data = substream; 647 entry->c.text.read = NULL; 648 entry->c.text.write = snd_pcm_xrun_injection_write; 649 entry->mode = S_IFREG | S_IWUSR; 650 if (snd_info_register(entry) < 0) { 651 snd_info_free_entry(entry); 652 entry = NULL; 653 } 654 } 655 substream->proc_xrun_injection_entry = entry; 656 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */ 657 658 return 0; 659 } 660 661 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 662 { 663 snd_info_free_entry(substream->proc_info_entry); 664 substream->proc_info_entry = NULL; 665 snd_info_free_entry(substream->proc_hw_params_entry); 666 substream->proc_hw_params_entry = NULL; 667 snd_info_free_entry(substream->proc_sw_params_entry); 668 substream->proc_sw_params_entry = NULL; 669 snd_info_free_entry(substream->proc_status_entry); 670 substream->proc_status_entry = NULL; 671 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 672 snd_info_free_entry(substream->proc_xrun_injection_entry); 673 substream->proc_xrun_injection_entry = NULL; 674 #endif 675 snd_info_free_entry(substream->proc_root); 676 substream->proc_root = NULL; 677 return 0; 678 } 679 #else /* !CONFIG_SND_VERBOSE_PROCFS */ 680 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 681 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 682 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 683 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 684 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 685 686 static const struct attribute_group *pcm_dev_attr_groups[]; 687 688 /** 689 * snd_pcm_new_stream - create a new PCM stream 690 * @pcm: the pcm instance 691 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 692 * @substream_count: the number of substreams 693 * 694 * Creates a new stream for the pcm. 695 * The corresponding stream on the pcm must have been empty before 696 * calling this, i.e. zero must be given to the argument of 697 * snd_pcm_new(). 698 * 699 * Return: Zero if successful, or a negative error code on failure. 700 */ 701 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 702 { 703 int idx, err; 704 struct snd_pcm_str *pstr = &pcm->streams[stream]; 705 struct snd_pcm_substream *substream, *prev; 706 707 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 708 mutex_init(&pstr->oss.setup_mutex); 709 #endif 710 pstr->stream = stream; 711 pstr->pcm = pcm; 712 pstr->substream_count = substream_count; 713 if (!substream_count) 714 return 0; 715 716 snd_device_initialize(&pstr->dev, pcm->card); 717 pstr->dev.groups = pcm_dev_attr_groups; 718 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device, 719 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 720 721 if (!pcm->internal) { 722 err = snd_pcm_stream_proc_init(pstr); 723 if (err < 0) { 724 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n"); 725 return err; 726 } 727 } 728 prev = NULL; 729 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 730 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 731 if (!substream) 732 return -ENOMEM; 733 substream->pcm = pcm; 734 substream->pstr = pstr; 735 substream->number = idx; 736 substream->stream = stream; 737 sprintf(substream->name, "subdevice #%i", idx); 738 substream->buffer_bytes_max = UINT_MAX; 739 if (prev == NULL) 740 pstr->substream = substream; 741 else 742 prev->next = substream; 743 744 if (!pcm->internal) { 745 err = snd_pcm_substream_proc_init(substream); 746 if (err < 0) { 747 pcm_err(pcm, 748 "Error in snd_pcm_stream_proc_init\n"); 749 if (prev == NULL) 750 pstr->substream = NULL; 751 else 752 prev->next = NULL; 753 kfree(substream); 754 return err; 755 } 756 } 757 substream->group = &substream->self_group; 758 spin_lock_init(&substream->self_group.lock); 759 mutex_init(&substream->self_group.mutex); 760 INIT_LIST_HEAD(&substream->self_group.substreams); 761 list_add_tail(&substream->link_list, &substream->self_group.substreams); 762 atomic_set(&substream->mmap_count, 0); 763 prev = substream; 764 } 765 return 0; 766 } 767 EXPORT_SYMBOL(snd_pcm_new_stream); 768 769 static int _snd_pcm_new(struct snd_card *card, const char *id, int device, 770 int playback_count, int capture_count, bool internal, 771 struct snd_pcm **rpcm) 772 { 773 struct snd_pcm *pcm; 774 int err; 775 static struct snd_device_ops ops = { 776 .dev_free = snd_pcm_dev_free, 777 .dev_register = snd_pcm_dev_register, 778 .dev_disconnect = snd_pcm_dev_disconnect, 779 }; 780 static struct snd_device_ops internal_ops = { 781 .dev_free = snd_pcm_dev_free, 782 }; 783 784 if (snd_BUG_ON(!card)) 785 return -ENXIO; 786 if (rpcm) 787 *rpcm = NULL; 788 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 789 if (!pcm) 790 return -ENOMEM; 791 pcm->card = card; 792 pcm->device = device; 793 pcm->internal = internal; 794 mutex_init(&pcm->open_mutex); 795 init_waitqueue_head(&pcm->open_wait); 796 INIT_LIST_HEAD(&pcm->list); 797 if (id) 798 strlcpy(pcm->id, id, sizeof(pcm->id)); 799 800 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, 801 playback_count); 802 if (err < 0) 803 goto free_pcm; 804 805 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count); 806 if (err < 0) 807 goto free_pcm; 808 809 err = snd_device_new(card, SNDRV_DEV_PCM, pcm, 810 internal ? &internal_ops : &ops); 811 if (err < 0) 812 goto free_pcm; 813 814 if (rpcm) 815 *rpcm = pcm; 816 return 0; 817 818 free_pcm: 819 snd_pcm_free(pcm); 820 return err; 821 } 822 823 /** 824 * snd_pcm_new - create a new PCM instance 825 * @card: the card instance 826 * @id: the id string 827 * @device: the device index (zero based) 828 * @playback_count: the number of substreams for playback 829 * @capture_count: the number of substreams for capture 830 * @rpcm: the pointer to store the new pcm instance 831 * 832 * Creates a new PCM instance. 833 * 834 * The pcm operators have to be set afterwards to the new instance 835 * via snd_pcm_set_ops(). 836 * 837 * Return: Zero if successful, or a negative error code on failure. 838 */ 839 int snd_pcm_new(struct snd_card *card, const char *id, int device, 840 int playback_count, int capture_count, struct snd_pcm **rpcm) 841 { 842 return _snd_pcm_new(card, id, device, playback_count, capture_count, 843 false, rpcm); 844 } 845 EXPORT_SYMBOL(snd_pcm_new); 846 847 /** 848 * snd_pcm_new_internal - create a new internal PCM instance 849 * @card: the card instance 850 * @id: the id string 851 * @device: the device index (zero based - shared with normal PCMs) 852 * @playback_count: the number of substreams for playback 853 * @capture_count: the number of substreams for capture 854 * @rpcm: the pointer to store the new pcm instance 855 * 856 * Creates a new internal PCM instance with no userspace device or procfs 857 * entries. This is used by ASoC Back End PCMs in order to create a PCM that 858 * will only be used internally by kernel drivers. i.e. it cannot be opened 859 * by userspace. It provides existing ASoC components drivers with a substream 860 * and access to any private data. 861 * 862 * The pcm operators have to be set afterwards to the new instance 863 * via snd_pcm_set_ops(). 864 * 865 * Return: Zero if successful, or a negative error code on failure. 866 */ 867 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 868 int playback_count, int capture_count, 869 struct snd_pcm **rpcm) 870 { 871 return _snd_pcm_new(card, id, device, playback_count, capture_count, 872 true, rpcm); 873 } 874 EXPORT_SYMBOL(snd_pcm_new_internal); 875 876 static void free_chmap(struct snd_pcm_str *pstr) 877 { 878 if (pstr->chmap_kctl) { 879 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl); 880 pstr->chmap_kctl = NULL; 881 } 882 } 883 884 static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 885 { 886 struct snd_pcm_substream *substream, *substream_next; 887 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 888 struct snd_pcm_oss_setup *setup, *setupn; 889 #endif 890 substream = pstr->substream; 891 while (substream) { 892 substream_next = substream->next; 893 snd_pcm_timer_done(substream); 894 snd_pcm_substream_proc_done(substream); 895 kfree(substream); 896 substream = substream_next; 897 } 898 snd_pcm_stream_proc_done(pstr); 899 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 900 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 901 setupn = setup->next; 902 kfree(setup->task_name); 903 kfree(setup); 904 } 905 #endif 906 free_chmap(pstr); 907 if (pstr->substream_count) 908 put_device(&pstr->dev); 909 } 910 911 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 912 #define pcm_call_notify(pcm, call) \ 913 do { \ 914 struct snd_pcm_notify *_notify; \ 915 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \ 916 _notify->call(pcm); \ 917 } while (0) 918 #else 919 #define pcm_call_notify(pcm, call) do {} while (0) 920 #endif 921 922 static int snd_pcm_free(struct snd_pcm *pcm) 923 { 924 if (!pcm) 925 return 0; 926 if (!pcm->internal) 927 pcm_call_notify(pcm, n_unregister); 928 if (pcm->private_free) 929 pcm->private_free(pcm); 930 snd_pcm_lib_preallocate_free_for_all(pcm); 931 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 932 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 933 kfree(pcm); 934 return 0; 935 } 936 937 static int snd_pcm_dev_free(struct snd_device *device) 938 { 939 struct snd_pcm *pcm = device->device_data; 940 return snd_pcm_free(pcm); 941 } 942 943 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 944 struct file *file, 945 struct snd_pcm_substream **rsubstream) 946 { 947 struct snd_pcm_str * pstr; 948 struct snd_pcm_substream *substream; 949 struct snd_pcm_runtime *runtime; 950 struct snd_card *card; 951 int prefer_subdevice; 952 size_t size; 953 954 if (snd_BUG_ON(!pcm || !rsubstream)) 955 return -ENXIO; 956 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK && 957 stream != SNDRV_PCM_STREAM_CAPTURE)) 958 return -EINVAL; 959 *rsubstream = NULL; 960 pstr = &pcm->streams[stream]; 961 if (pstr->substream == NULL || pstr->substream_count == 0) 962 return -ENODEV; 963 964 card = pcm->card; 965 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM); 966 967 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 968 int opposite = !stream; 969 970 for (substream = pcm->streams[opposite].substream; substream; 971 substream = substream->next) { 972 if (SUBSTREAM_BUSY(substream)) 973 return -EAGAIN; 974 } 975 } 976 977 if (file->f_flags & O_APPEND) { 978 if (prefer_subdevice < 0) { 979 if (pstr->substream_count > 1) 980 return -EINVAL; /* must be unique */ 981 substream = pstr->substream; 982 } else { 983 for (substream = pstr->substream; substream; 984 substream = substream->next) 985 if (substream->number == prefer_subdevice) 986 break; 987 } 988 if (! substream) 989 return -ENODEV; 990 if (! SUBSTREAM_BUSY(substream)) 991 return -EBADFD; 992 substream->ref_count++; 993 *rsubstream = substream; 994 return 0; 995 } 996 997 for (substream = pstr->substream; substream; substream = substream->next) { 998 if (!SUBSTREAM_BUSY(substream) && 999 (prefer_subdevice == -1 || 1000 substream->number == prefer_subdevice)) 1001 break; 1002 } 1003 if (substream == NULL) 1004 return -EAGAIN; 1005 1006 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 1007 if (runtime == NULL) 1008 return -ENOMEM; 1009 1010 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 1011 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 1012 if (runtime->status == NULL) { 1013 kfree(runtime); 1014 return -ENOMEM; 1015 } 1016 memset((void*)runtime->status, 0, size); 1017 1018 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 1019 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 1020 if (runtime->control == NULL) { 1021 snd_free_pages((void*)runtime->status, 1022 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 1023 kfree(runtime); 1024 return -ENOMEM; 1025 } 1026 memset((void*)runtime->control, 0, size); 1027 1028 init_waitqueue_head(&runtime->sleep); 1029 init_waitqueue_head(&runtime->tsleep); 1030 1031 runtime->status->state = SNDRV_PCM_STATE_OPEN; 1032 1033 substream->runtime = runtime; 1034 substream->private_data = pcm->private_data; 1035 substream->ref_count = 1; 1036 substream->f_flags = file->f_flags; 1037 substream->pid = get_pid(task_pid(current)); 1038 pstr->substream_opened++; 1039 *rsubstream = substream; 1040 return 0; 1041 } 1042 1043 void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 1044 { 1045 struct snd_pcm_runtime *runtime; 1046 1047 if (PCM_RUNTIME_CHECK(substream)) 1048 return; 1049 runtime = substream->runtime; 1050 if (runtime->private_free != NULL) 1051 runtime->private_free(runtime); 1052 snd_free_pages((void*)runtime->status, 1053 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 1054 snd_free_pages((void*)runtime->control, 1055 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 1056 kfree(runtime->hw_constraints.rules); 1057 kfree(runtime); 1058 substream->runtime = NULL; 1059 put_pid(substream->pid); 1060 substream->pid = NULL; 1061 substream->pstr->substream_opened--; 1062 } 1063 1064 static ssize_t show_pcm_class(struct device *dev, 1065 struct device_attribute *attr, char *buf) 1066 { 1067 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev); 1068 struct snd_pcm *pcm = pstr->pcm; 1069 const char *str; 1070 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 1071 [SNDRV_PCM_CLASS_GENERIC] = "generic", 1072 [SNDRV_PCM_CLASS_MULTI] = "multi", 1073 [SNDRV_PCM_CLASS_MODEM] = "modem", 1074 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 1075 }; 1076 1077 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST) 1078 str = "none"; 1079 else 1080 str = strs[pcm->dev_class]; 1081 return snprintf(buf, PAGE_SIZE, "%s\n", str); 1082 } 1083 1084 static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); 1085 static struct attribute *pcm_dev_attrs[] = { 1086 &dev_attr_pcm_class.attr, 1087 NULL 1088 }; 1089 1090 static const struct attribute_group pcm_dev_attr_group = { 1091 .attrs = pcm_dev_attrs, 1092 }; 1093 1094 static const struct attribute_group *pcm_dev_attr_groups[] = { 1095 &pcm_dev_attr_group, 1096 NULL 1097 }; 1098 1099 static int snd_pcm_dev_register(struct snd_device *device) 1100 { 1101 int cidx, err; 1102 struct snd_pcm_substream *substream; 1103 struct snd_pcm *pcm; 1104 1105 if (snd_BUG_ON(!device || !device->device_data)) 1106 return -ENXIO; 1107 pcm = device->device_data; 1108 1109 mutex_lock(®ister_mutex); 1110 err = snd_pcm_add(pcm); 1111 if (err) 1112 goto unlock; 1113 for (cidx = 0; cidx < 2; cidx++) { 1114 int devtype = -1; 1115 if (pcm->streams[cidx].substream == NULL) 1116 continue; 1117 switch (cidx) { 1118 case SNDRV_PCM_STREAM_PLAYBACK: 1119 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1120 break; 1121 case SNDRV_PCM_STREAM_CAPTURE: 1122 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1123 break; 1124 } 1125 /* register pcm */ 1126 err = snd_register_device(devtype, pcm->card, pcm->device, 1127 &snd_pcm_f_ops[cidx], pcm, 1128 &pcm->streams[cidx].dev); 1129 if (err < 0) { 1130 list_del_init(&pcm->list); 1131 goto unlock; 1132 } 1133 1134 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1135 snd_pcm_timer_init(substream); 1136 } 1137 1138 pcm_call_notify(pcm, n_register); 1139 1140 unlock: 1141 mutex_unlock(®ister_mutex); 1142 return err; 1143 } 1144 1145 static int snd_pcm_dev_disconnect(struct snd_device *device) 1146 { 1147 struct snd_pcm *pcm = device->device_data; 1148 struct snd_pcm_substream *substream; 1149 int cidx; 1150 1151 mutex_lock(®ister_mutex); 1152 mutex_lock(&pcm->open_mutex); 1153 wake_up(&pcm->open_wait); 1154 list_del_init(&pcm->list); 1155 for (cidx = 0; cidx < 2; cidx++) { 1156 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { 1157 snd_pcm_stream_lock_irq(substream); 1158 if (substream->runtime) { 1159 if (snd_pcm_running(substream)) 1160 snd_pcm_stop(substream, 1161 SNDRV_PCM_STATE_DISCONNECTED); 1162 /* to be sure, set the state unconditionally */ 1163 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1164 wake_up(&substream->runtime->sleep); 1165 wake_up(&substream->runtime->tsleep); 1166 } 1167 snd_pcm_stream_unlock_irq(substream); 1168 } 1169 } 1170 1171 pcm_call_notify(pcm, n_disconnect); 1172 for (cidx = 0; cidx < 2; cidx++) { 1173 snd_unregister_device(&pcm->streams[cidx].dev); 1174 free_chmap(&pcm->streams[cidx]); 1175 } 1176 mutex_unlock(&pcm->open_mutex); 1177 mutex_unlock(®ister_mutex); 1178 return 0; 1179 } 1180 1181 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 1182 /** 1183 * snd_pcm_notify - Add/remove the notify list 1184 * @notify: PCM notify list 1185 * @nfree: 0 = register, 1 = unregister 1186 * 1187 * This adds the given notifier to the global list so that the callback is 1188 * called for each registered PCM devices. This exists only for PCM OSS 1189 * emulation, so far. 1190 */ 1191 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1192 { 1193 struct snd_pcm *pcm; 1194 1195 if (snd_BUG_ON(!notify || 1196 !notify->n_register || 1197 !notify->n_unregister || 1198 !notify->n_disconnect)) 1199 return -EINVAL; 1200 mutex_lock(®ister_mutex); 1201 if (nfree) { 1202 list_del(¬ify->list); 1203 list_for_each_entry(pcm, &snd_pcm_devices, list) 1204 notify->n_unregister(pcm); 1205 } else { 1206 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1207 list_for_each_entry(pcm, &snd_pcm_devices, list) 1208 notify->n_register(pcm); 1209 } 1210 mutex_unlock(®ister_mutex); 1211 return 0; 1212 } 1213 EXPORT_SYMBOL(snd_pcm_notify); 1214 #endif /* CONFIG_SND_PCM_OSS */ 1215 1216 #ifdef CONFIG_SND_PROC_FS 1217 /* 1218 * Info interface 1219 */ 1220 1221 static void snd_pcm_proc_read(struct snd_info_entry *entry, 1222 struct snd_info_buffer *buffer) 1223 { 1224 struct snd_pcm *pcm; 1225 1226 mutex_lock(®ister_mutex); 1227 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1228 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1229 pcm->card->number, pcm->device, pcm->id, pcm->name); 1230 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1231 snd_iprintf(buffer, " : playback %i", 1232 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1233 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1234 snd_iprintf(buffer, " : capture %i", 1235 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1236 snd_iprintf(buffer, "\n"); 1237 } 1238 mutex_unlock(®ister_mutex); 1239 } 1240 1241 static struct snd_info_entry *snd_pcm_proc_entry; 1242 1243 static void snd_pcm_proc_init(void) 1244 { 1245 struct snd_info_entry *entry; 1246 1247 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL); 1248 if (entry) { 1249 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1250 if (snd_info_register(entry) < 0) { 1251 snd_info_free_entry(entry); 1252 entry = NULL; 1253 } 1254 } 1255 snd_pcm_proc_entry = entry; 1256 } 1257 1258 static void snd_pcm_proc_done(void) 1259 { 1260 snd_info_free_entry(snd_pcm_proc_entry); 1261 } 1262 1263 #else /* !CONFIG_SND_PROC_FS */ 1264 #define snd_pcm_proc_init() 1265 #define snd_pcm_proc_done() 1266 #endif /* CONFIG_SND_PROC_FS */ 1267 1268 1269 /* 1270 * ENTRY functions 1271 */ 1272 1273 static int __init alsa_pcm_init(void) 1274 { 1275 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1276 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1277 snd_pcm_proc_init(); 1278 return 0; 1279 } 1280 1281 static void __exit alsa_pcm_exit(void) 1282 { 1283 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1284 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1285 snd_pcm_proc_done(); 1286 } 1287 1288 module_init(alsa_pcm_init) 1289 module_exit(alsa_pcm_exit) 1290