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 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 35 MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 36 MODULE_LICENSE("GPL"); 37 38 static LIST_HEAD(snd_pcm_devices); 39 static LIST_HEAD(snd_pcm_notify_list); 40 static DEFINE_MUTEX(register_mutex); 41 42 static int snd_pcm_free(struct snd_pcm *pcm); 43 static int snd_pcm_dev_free(struct snd_device *device); 44 static int snd_pcm_dev_register(struct snd_device *device); 45 static int snd_pcm_dev_disconnect(struct snd_device *device); 46 47 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) 48 { 49 struct snd_pcm *pcm; 50 51 list_for_each_entry(pcm, &snd_pcm_devices, list) { 52 if (pcm->internal) 53 continue; 54 if (pcm->card == card && pcm->device == device) 55 return pcm; 56 } 57 return NULL; 58 } 59 60 static int snd_pcm_next(struct snd_card *card, int device) 61 { 62 struct snd_pcm *pcm; 63 64 list_for_each_entry(pcm, &snd_pcm_devices, list) { 65 if (pcm->internal) 66 continue; 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 list_for_each_entry(pcm, &snd_pcm_devices, list) { 80 if (pcm->card == newpcm->card && pcm->device == newpcm->device) 81 return -EBUSY; 82 if (pcm->card->number > newpcm->card->number || 83 (pcm->card == newpcm->card && 84 pcm->device > newpcm->device)) { 85 list_add(&newpcm->list, pcm->list.prev); 86 return 0; 87 } 88 } 89 list_add_tail(&newpcm->list, &snd_pcm_devices); 90 return 0; 91 } 92 93 static int snd_pcm_control_ioctl(struct snd_card *card, 94 struct snd_ctl_file *control, 95 unsigned int cmd, unsigned long arg) 96 { 97 switch (cmd) { 98 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 99 { 100 int device; 101 102 if (get_user(device, (int __user *)arg)) 103 return -EFAULT; 104 mutex_lock(®ister_mutex); 105 device = snd_pcm_next(card, device); 106 mutex_unlock(®ister_mutex); 107 if (put_user(device, (int __user *)arg)) 108 return -EFAULT; 109 return 0; 110 } 111 case SNDRV_CTL_IOCTL_PCM_INFO: 112 { 113 struct snd_pcm_info __user *info; 114 unsigned int device, subdevice; 115 int stream; 116 struct snd_pcm *pcm; 117 struct snd_pcm_str *pstr; 118 struct snd_pcm_substream *substream; 119 int err; 120 121 info = (struct snd_pcm_info __user *)arg; 122 if (get_user(device, &info->device)) 123 return -EFAULT; 124 if (get_user(stream, &info->stream)) 125 return -EFAULT; 126 if (stream < 0 || stream > 1) 127 return -EINVAL; 128 if (get_user(subdevice, &info->subdevice)) 129 return -EFAULT; 130 mutex_lock(®ister_mutex); 131 pcm = snd_pcm_get(card, device); 132 if (pcm == NULL) { 133 err = -ENXIO; 134 goto _error; 135 } 136 pstr = &pcm->streams[stream]; 137 if (pstr->substream_count == 0) { 138 err = -ENOENT; 139 goto _error; 140 } 141 if (subdevice >= pstr->substream_count) { 142 err = -ENXIO; 143 goto _error; 144 } 145 for (substream = pstr->substream; substream; 146 substream = substream->next) 147 if (substream->number == (int)subdevice) 148 break; 149 if (substream == NULL) { 150 err = -ENXIO; 151 goto _error; 152 } 153 err = snd_pcm_info_user(substream, info); 154 _error: 155 mutex_unlock(®ister_mutex); 156 return err; 157 } 158 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 159 { 160 int val; 161 162 if (get_user(val, (int __user *)arg)) 163 return -EFAULT; 164 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val; 165 return 0; 166 } 167 } 168 return -ENOIOCTLCMD; 169 } 170 171 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 172 173 static char *snd_pcm_format_names[] = { 174 FORMAT(S8), 175 FORMAT(U8), 176 FORMAT(S16_LE), 177 FORMAT(S16_BE), 178 FORMAT(U16_LE), 179 FORMAT(U16_BE), 180 FORMAT(S24_LE), 181 FORMAT(S24_BE), 182 FORMAT(U24_LE), 183 FORMAT(U24_BE), 184 FORMAT(S32_LE), 185 FORMAT(S32_BE), 186 FORMAT(U32_LE), 187 FORMAT(U32_BE), 188 FORMAT(FLOAT_LE), 189 FORMAT(FLOAT_BE), 190 FORMAT(FLOAT64_LE), 191 FORMAT(FLOAT64_BE), 192 FORMAT(IEC958_SUBFRAME_LE), 193 FORMAT(IEC958_SUBFRAME_BE), 194 FORMAT(MU_LAW), 195 FORMAT(A_LAW), 196 FORMAT(IMA_ADPCM), 197 FORMAT(MPEG), 198 FORMAT(GSM), 199 FORMAT(SPECIAL), 200 FORMAT(S24_3LE), 201 FORMAT(S24_3BE), 202 FORMAT(U24_3LE), 203 FORMAT(U24_3BE), 204 FORMAT(S20_3LE), 205 FORMAT(S20_3BE), 206 FORMAT(U20_3LE), 207 FORMAT(U20_3BE), 208 FORMAT(S18_3LE), 209 FORMAT(S18_3BE), 210 FORMAT(U18_3LE), 211 FORMAT(U18_3BE), 212 FORMAT(G723_24), 213 FORMAT(G723_24_1B), 214 FORMAT(G723_40), 215 FORMAT(G723_40_1B), 216 FORMAT(DSD_U8), 217 FORMAT(DSD_U16_LE), 218 FORMAT(DSD_U32_LE), 219 FORMAT(DSD_U16_BE), 220 FORMAT(DSD_U32_BE), 221 }; 222 223 /** 224 * snd_pcm_format_name - Return a name string for the given PCM format 225 * @format: PCM format 226 */ 227 const char *snd_pcm_format_name(snd_pcm_format_t format) 228 { 229 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) 230 return "Unknown"; 231 return snd_pcm_format_names[(__force unsigned int)format]; 232 } 233 EXPORT_SYMBOL_GPL(snd_pcm_format_name); 234 235 #ifdef CONFIG_SND_VERBOSE_PROCFS 236 237 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v 238 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 239 #define READY(v) [SNDRV_PCM_READY_##v] = #v 240 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 241 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 242 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 243 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 244 #define START(v) [SNDRV_PCM_START_##v] = #v 245 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 246 247 static char *snd_pcm_stream_names[] = { 248 STREAM(PLAYBACK), 249 STREAM(CAPTURE), 250 }; 251 252 static char *snd_pcm_state_names[] = { 253 STATE(OPEN), 254 STATE(SETUP), 255 STATE(PREPARED), 256 STATE(RUNNING), 257 STATE(XRUN), 258 STATE(DRAINING), 259 STATE(PAUSED), 260 STATE(SUSPENDED), 261 }; 262 263 static char *snd_pcm_access_names[] = { 264 ACCESS(MMAP_INTERLEAVED), 265 ACCESS(MMAP_NONINTERLEAVED), 266 ACCESS(MMAP_COMPLEX), 267 ACCESS(RW_INTERLEAVED), 268 ACCESS(RW_NONINTERLEAVED), 269 }; 270 271 static char *snd_pcm_subformat_names[] = { 272 SUBFORMAT(STD), 273 }; 274 275 static char *snd_pcm_tstamp_mode_names[] = { 276 TSTAMP(NONE), 277 TSTAMP(ENABLE), 278 }; 279 280 static const char *snd_pcm_stream_name(int stream) 281 { 282 return snd_pcm_stream_names[stream]; 283 } 284 285 static const char *snd_pcm_access_name(snd_pcm_access_t access) 286 { 287 return snd_pcm_access_names[(__force int)access]; 288 } 289 290 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 291 { 292 return snd_pcm_subformat_names[(__force int)subformat]; 293 } 294 295 static const char *snd_pcm_tstamp_mode_name(int mode) 296 { 297 return snd_pcm_tstamp_mode_names[mode]; 298 } 299 300 static const char *snd_pcm_state_name(snd_pcm_state_t state) 301 { 302 return snd_pcm_state_names[(__force int)state]; 303 } 304 305 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 306 #include <linux/soundcard.h> 307 308 static const char *snd_pcm_oss_format_name(int format) 309 { 310 switch (format) { 311 case AFMT_MU_LAW: 312 return "MU_LAW"; 313 case AFMT_A_LAW: 314 return "A_LAW"; 315 case AFMT_IMA_ADPCM: 316 return "IMA_ADPCM"; 317 case AFMT_U8: 318 return "U8"; 319 case AFMT_S16_LE: 320 return "S16_LE"; 321 case AFMT_S16_BE: 322 return "S16_BE"; 323 case AFMT_S8: 324 return "S8"; 325 case AFMT_U16_LE: 326 return "U16_LE"; 327 case AFMT_U16_BE: 328 return "U16_BE"; 329 case AFMT_MPEG: 330 return "MPEG"; 331 default: 332 return "unknown"; 333 } 334 } 335 #endif 336 337 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 338 struct snd_info_buffer *buffer) 339 { 340 struct snd_pcm_info *info; 341 int err; 342 343 if (! substream) 344 return; 345 346 info = kmalloc(sizeof(*info), GFP_KERNEL); 347 if (! info) { 348 pcm_dbg(substream->pcm, 349 "snd_pcm_proc_info_read: cannot malloc\n"); 350 return; 351 } 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 == NULL) { 722 pcm_err(pcm, "Cannot allocate PCM substream\n"); 723 return -ENOMEM; 724 } 725 substream->pcm = pcm; 726 substream->pstr = pstr; 727 substream->number = idx; 728 substream->stream = stream; 729 sprintf(substream->name, "subdevice #%i", idx); 730 substream->buffer_bytes_max = UINT_MAX; 731 if (prev == NULL) 732 pstr->substream = substream; 733 else 734 prev->next = substream; 735 736 if (!pcm->internal) { 737 err = snd_pcm_substream_proc_init(substream); 738 if (err < 0) { 739 pcm_err(pcm, 740 "Error in snd_pcm_stream_proc_init\n"); 741 if (prev == NULL) 742 pstr->substream = NULL; 743 else 744 prev->next = NULL; 745 kfree(substream); 746 return err; 747 } 748 } 749 substream->group = &substream->self_group; 750 spin_lock_init(&substream->self_group.lock); 751 mutex_init(&substream->self_group.mutex); 752 INIT_LIST_HEAD(&substream->self_group.substreams); 753 list_add_tail(&substream->link_list, &substream->self_group.substreams); 754 atomic_set(&substream->mmap_count, 0); 755 prev = substream; 756 } 757 return 0; 758 } 759 EXPORT_SYMBOL(snd_pcm_new_stream); 760 761 static int _snd_pcm_new(struct snd_card *card, const char *id, int device, 762 int playback_count, int capture_count, bool internal, 763 struct snd_pcm **rpcm) 764 { 765 struct snd_pcm *pcm; 766 int err; 767 static struct snd_device_ops ops = { 768 .dev_free = snd_pcm_dev_free, 769 .dev_register = snd_pcm_dev_register, 770 .dev_disconnect = snd_pcm_dev_disconnect, 771 }; 772 773 if (snd_BUG_ON(!card)) 774 return -ENXIO; 775 if (rpcm) 776 *rpcm = NULL; 777 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 778 if (pcm == NULL) { 779 dev_err(card->dev, "Cannot allocate PCM\n"); 780 return -ENOMEM; 781 } 782 pcm->card = card; 783 pcm->device = device; 784 pcm->internal = internal; 785 if (id) 786 strlcpy(pcm->id, id, sizeof(pcm->id)); 787 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 788 snd_pcm_free(pcm); 789 return err; 790 } 791 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 792 snd_pcm_free(pcm); 793 return err; 794 } 795 mutex_init(&pcm->open_mutex); 796 init_waitqueue_head(&pcm->open_wait); 797 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 798 snd_pcm_free(pcm); 799 return err; 800 } 801 if (rpcm) 802 *rpcm = pcm; 803 return 0; 804 } 805 806 /** 807 * snd_pcm_new - create a new PCM instance 808 * @card: the card instance 809 * @id: the id string 810 * @device: the device index (zero based) 811 * @playback_count: the number of substreams for playback 812 * @capture_count: the number of substreams for capture 813 * @rpcm: the pointer to store the new pcm instance 814 * 815 * Creates a new PCM instance. 816 * 817 * The pcm operators have to be set afterwards to the new instance 818 * via snd_pcm_set_ops(). 819 * 820 * Return: Zero if successful, or a negative error code on failure. 821 */ 822 int snd_pcm_new(struct snd_card *card, const char *id, int device, 823 int playback_count, int capture_count, struct snd_pcm **rpcm) 824 { 825 return _snd_pcm_new(card, id, device, playback_count, capture_count, 826 false, rpcm); 827 } 828 EXPORT_SYMBOL(snd_pcm_new); 829 830 /** 831 * snd_pcm_new_internal - create a new internal PCM instance 832 * @card: the card instance 833 * @id: the id string 834 * @device: the device index (zero based - shared with normal PCMs) 835 * @playback_count: the number of substreams for playback 836 * @capture_count: the number of substreams for capture 837 * @rpcm: the pointer to store the new pcm instance 838 * 839 * Creates a new internal PCM instance with no userspace device or procfs 840 * entries. This is used by ASoC Back End PCMs in order to create a PCM that 841 * will only be used internally by kernel drivers. i.e. it cannot be opened 842 * by userspace. It provides existing ASoC components drivers with a substream 843 * and access to any private data. 844 * 845 * The pcm operators have to be set afterwards to the new instance 846 * via snd_pcm_set_ops(). 847 * 848 * Return: Zero if successful, or a negative error code on failure. 849 */ 850 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 851 int playback_count, int capture_count, 852 struct snd_pcm **rpcm) 853 { 854 return _snd_pcm_new(card, id, device, playback_count, capture_count, 855 true, rpcm); 856 } 857 EXPORT_SYMBOL(snd_pcm_new_internal); 858 859 static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 860 { 861 struct snd_pcm_substream *substream, *substream_next; 862 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 863 struct snd_pcm_oss_setup *setup, *setupn; 864 #endif 865 substream = pstr->substream; 866 while (substream) { 867 substream_next = substream->next; 868 snd_pcm_timer_done(substream); 869 snd_pcm_substream_proc_done(substream); 870 kfree(substream); 871 substream = substream_next; 872 } 873 snd_pcm_stream_proc_done(pstr); 874 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 875 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 876 setupn = setup->next; 877 kfree(setup->task_name); 878 kfree(setup); 879 } 880 #endif 881 if (pstr->substream_count) 882 put_device(&pstr->dev); 883 } 884 885 static int snd_pcm_free(struct snd_pcm *pcm) 886 { 887 struct snd_pcm_notify *notify; 888 889 if (!pcm) 890 return 0; 891 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 892 notify->n_unregister(pcm); 893 } 894 if (pcm->private_free) 895 pcm->private_free(pcm); 896 snd_pcm_lib_preallocate_free_for_all(pcm); 897 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 898 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 899 kfree(pcm); 900 return 0; 901 } 902 903 static int snd_pcm_dev_free(struct snd_device *device) 904 { 905 struct snd_pcm *pcm = device->device_data; 906 return snd_pcm_free(pcm); 907 } 908 909 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 910 struct file *file, 911 struct snd_pcm_substream **rsubstream) 912 { 913 struct snd_pcm_str * pstr; 914 struct snd_pcm_substream *substream; 915 struct snd_pcm_runtime *runtime; 916 struct snd_card *card; 917 int prefer_subdevice; 918 size_t size; 919 920 if (snd_BUG_ON(!pcm || !rsubstream)) 921 return -ENXIO; 922 *rsubstream = NULL; 923 pstr = &pcm->streams[stream]; 924 if (pstr->substream == NULL || pstr->substream_count == 0) 925 return -ENODEV; 926 927 card = pcm->card; 928 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM); 929 930 switch (stream) { 931 case SNDRV_PCM_STREAM_PLAYBACK: 932 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 933 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 934 if (SUBSTREAM_BUSY(substream)) 935 return -EAGAIN; 936 } 937 } 938 break; 939 case SNDRV_PCM_STREAM_CAPTURE: 940 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 941 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 942 if (SUBSTREAM_BUSY(substream)) 943 return -EAGAIN; 944 } 945 } 946 break; 947 default: 948 return -EINVAL; 949 } 950 951 if (file->f_flags & O_APPEND) { 952 if (prefer_subdevice < 0) { 953 if (pstr->substream_count > 1) 954 return -EINVAL; /* must be unique */ 955 substream = pstr->substream; 956 } else { 957 for (substream = pstr->substream; substream; 958 substream = substream->next) 959 if (substream->number == prefer_subdevice) 960 break; 961 } 962 if (! substream) 963 return -ENODEV; 964 if (! SUBSTREAM_BUSY(substream)) 965 return -EBADFD; 966 substream->ref_count++; 967 *rsubstream = substream; 968 return 0; 969 } 970 971 if (prefer_subdevice >= 0) { 972 for (substream = pstr->substream; substream; substream = substream->next) 973 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 974 goto __ok; 975 } 976 for (substream = pstr->substream; substream; substream = substream->next) 977 if (!SUBSTREAM_BUSY(substream)) 978 break; 979 __ok: 980 if (substream == NULL) 981 return -EAGAIN; 982 983 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 984 if (runtime == NULL) 985 return -ENOMEM; 986 987 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 988 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 989 if (runtime->status == NULL) { 990 kfree(runtime); 991 return -ENOMEM; 992 } 993 memset((void*)runtime->status, 0, size); 994 995 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 996 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 997 if (runtime->control == NULL) { 998 snd_free_pages((void*)runtime->status, 999 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 1000 kfree(runtime); 1001 return -ENOMEM; 1002 } 1003 memset((void*)runtime->control, 0, size); 1004 1005 init_waitqueue_head(&runtime->sleep); 1006 init_waitqueue_head(&runtime->tsleep); 1007 1008 runtime->status->state = SNDRV_PCM_STATE_OPEN; 1009 1010 substream->runtime = runtime; 1011 substream->private_data = pcm->private_data; 1012 substream->ref_count = 1; 1013 substream->f_flags = file->f_flags; 1014 substream->pid = get_pid(task_pid(current)); 1015 pstr->substream_opened++; 1016 *rsubstream = substream; 1017 return 0; 1018 } 1019 1020 void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 1021 { 1022 struct snd_pcm_runtime *runtime; 1023 1024 if (PCM_RUNTIME_CHECK(substream)) 1025 return; 1026 runtime = substream->runtime; 1027 if (runtime->private_free != NULL) 1028 runtime->private_free(runtime); 1029 snd_free_pages((void*)runtime->status, 1030 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 1031 snd_free_pages((void*)runtime->control, 1032 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 1033 kfree(runtime->hw_constraints.rules); 1034 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 1035 kfree(runtime->hwptr_log); 1036 #endif 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 *pcm; 1048 const char *str; 1049 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 1050 [SNDRV_PCM_CLASS_GENERIC] = "generic", 1051 [SNDRV_PCM_CLASS_MULTI] = "multi", 1052 [SNDRV_PCM_CLASS_MODEM] = "modem", 1053 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 1054 }; 1055 1056 if (! (pcm = dev_get_drvdata(dev)) || 1057 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 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_notify *notify; 1084 struct snd_pcm *pcm; 1085 1086 if (snd_BUG_ON(!device || !device->device_data)) 1087 return -ENXIO; 1088 pcm = device->device_data; 1089 mutex_lock(®ister_mutex); 1090 err = snd_pcm_add(pcm); 1091 if (err) { 1092 mutex_unlock(®ister_mutex); 1093 return err; 1094 } 1095 for (cidx = 0; cidx < 2; cidx++) { 1096 int devtype = -1; 1097 if (pcm->streams[cidx].substream == NULL || pcm->internal) 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(&pcm->list); 1113 mutex_unlock(®ister_mutex); 1114 return err; 1115 } 1116 1117 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1118 snd_pcm_timer_init(substream); 1119 } 1120 1121 list_for_each_entry(notify, &snd_pcm_notify_list, list) 1122 notify->n_register(pcm); 1123 1124 mutex_unlock(®ister_mutex); 1125 return 0; 1126 } 1127 1128 static int snd_pcm_dev_disconnect(struct snd_device *device) 1129 { 1130 struct snd_pcm *pcm = device->device_data; 1131 struct snd_pcm_notify *notify; 1132 struct snd_pcm_substream *substream; 1133 int cidx; 1134 1135 mutex_lock(®ister_mutex); 1136 if (list_empty(&pcm->list)) 1137 goto unlock; 1138 1139 mutex_lock(&pcm->open_mutex); 1140 wake_up(&pcm->open_wait); 1141 list_del_init(&pcm->list); 1142 for (cidx = 0; cidx < 2; cidx++) 1143 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { 1144 snd_pcm_stream_lock_irq(substream); 1145 if (substream->runtime) { 1146 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1147 wake_up(&substream->runtime->sleep); 1148 wake_up(&substream->runtime->tsleep); 1149 } 1150 snd_pcm_stream_unlock_irq(substream); 1151 } 1152 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 1153 notify->n_disconnect(pcm); 1154 } 1155 for (cidx = 0; cidx < 2; cidx++) { 1156 snd_unregister_device(&pcm->streams[cidx].dev); 1157 if (pcm->streams[cidx].chmap_kctl) { 1158 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl); 1159 pcm->streams[cidx].chmap_kctl = NULL; 1160 } 1161 } 1162 mutex_unlock(&pcm->open_mutex); 1163 unlock: 1164 mutex_unlock(®ister_mutex); 1165 return 0; 1166 } 1167 1168 /** 1169 * snd_pcm_notify - Add/remove the notify list 1170 * @notify: PCM notify list 1171 * @nfree: 0 = register, 1 = unregister 1172 * 1173 * This adds the given notifier to the global list so that the callback is 1174 * called for each registered PCM devices. This exists only for PCM OSS 1175 * emulation, so far. 1176 */ 1177 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1178 { 1179 struct snd_pcm *pcm; 1180 1181 if (snd_BUG_ON(!notify || 1182 !notify->n_register || 1183 !notify->n_unregister || 1184 !notify->n_disconnect)) 1185 return -EINVAL; 1186 mutex_lock(®ister_mutex); 1187 if (nfree) { 1188 list_del(¬ify->list); 1189 list_for_each_entry(pcm, &snd_pcm_devices, list) 1190 notify->n_unregister(pcm); 1191 } else { 1192 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1193 list_for_each_entry(pcm, &snd_pcm_devices, list) 1194 notify->n_register(pcm); 1195 } 1196 mutex_unlock(®ister_mutex); 1197 return 0; 1198 } 1199 EXPORT_SYMBOL(snd_pcm_notify); 1200 1201 #ifdef CONFIG_PROC_FS 1202 /* 1203 * Info interface 1204 */ 1205 1206 static void snd_pcm_proc_read(struct snd_info_entry *entry, 1207 struct snd_info_buffer *buffer) 1208 { 1209 struct snd_pcm *pcm; 1210 1211 mutex_lock(®ister_mutex); 1212 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1213 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1214 pcm->card->number, pcm->device, pcm->id, pcm->name); 1215 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1216 snd_iprintf(buffer, " : playback %i", 1217 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1218 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1219 snd_iprintf(buffer, " : capture %i", 1220 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1221 snd_iprintf(buffer, "\n"); 1222 } 1223 mutex_unlock(®ister_mutex); 1224 } 1225 1226 static struct snd_info_entry *snd_pcm_proc_entry; 1227 1228 static void snd_pcm_proc_init(void) 1229 { 1230 struct snd_info_entry *entry; 1231 1232 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1233 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1234 if (snd_info_register(entry) < 0) { 1235 snd_info_free_entry(entry); 1236 entry = NULL; 1237 } 1238 } 1239 snd_pcm_proc_entry = entry; 1240 } 1241 1242 static void snd_pcm_proc_done(void) 1243 { 1244 snd_info_free_entry(snd_pcm_proc_entry); 1245 } 1246 1247 #else /* !CONFIG_PROC_FS */ 1248 #define snd_pcm_proc_init() 1249 #define snd_pcm_proc_done() 1250 #endif /* CONFIG_PROC_FS */ 1251 1252 1253 /* 1254 * ENTRY functions 1255 */ 1256 1257 static int __init alsa_pcm_init(void) 1258 { 1259 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1260 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1261 snd_pcm_proc_init(); 1262 return 0; 1263 } 1264 1265 static void __exit alsa_pcm_exit(void) 1266 { 1267 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1268 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1269 snd_pcm_proc_done(); 1270 } 1271 1272 module_init(alsa_pcm_init) 1273 module_exit(alsa_pcm_exit) 1274