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 <linux/nospec.h> 29 #include <sound/core.h> 30 #include <sound/minors.h> 31 #include <sound/pcm.h> 32 #include <sound/timer.h> 33 #include <sound/control.h> 34 #include <sound/info.h> 35 36 #include "pcm_local.h" 37 38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 39 MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 40 MODULE_LICENSE("GPL"); 41 42 static LIST_HEAD(snd_pcm_devices); 43 static DEFINE_MUTEX(register_mutex); 44 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 45 static LIST_HEAD(snd_pcm_notify_list); 46 #endif 47 48 static int snd_pcm_free(struct snd_pcm *pcm); 49 static int snd_pcm_dev_free(struct snd_device *device); 50 static int snd_pcm_dev_register(struct snd_device *device); 51 static int snd_pcm_dev_disconnect(struct snd_device *device); 52 53 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) 54 { 55 struct snd_pcm *pcm; 56 57 list_for_each_entry(pcm, &snd_pcm_devices, list) { 58 if (pcm->card == card && pcm->device == device) 59 return pcm; 60 } 61 return NULL; 62 } 63 64 static int snd_pcm_next(struct snd_card *card, int device) 65 { 66 struct snd_pcm *pcm; 67 68 list_for_each_entry(pcm, &snd_pcm_devices, list) { 69 if (pcm->card == card && pcm->device > device) 70 return pcm->device; 71 else if (pcm->card->number > card->number) 72 return -1; 73 } 74 return -1; 75 } 76 77 static int snd_pcm_add(struct snd_pcm *newpcm) 78 { 79 struct snd_pcm *pcm; 80 81 if (newpcm->internal) 82 return 0; 83 84 list_for_each_entry(pcm, &snd_pcm_devices, list) { 85 if (pcm->card == newpcm->card && pcm->device == newpcm->device) 86 return -EBUSY; 87 if (pcm->card->number > newpcm->card->number || 88 (pcm->card == newpcm->card && 89 pcm->device > newpcm->device)) { 90 list_add(&newpcm->list, pcm->list.prev); 91 return 0; 92 } 93 } 94 list_add_tail(&newpcm->list, &snd_pcm_devices); 95 return 0; 96 } 97 98 static int snd_pcm_control_ioctl(struct snd_card *card, 99 struct snd_ctl_file *control, 100 unsigned int cmd, unsigned long arg) 101 { 102 switch (cmd) { 103 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 104 { 105 int device; 106 107 if (get_user(device, (int __user *)arg)) 108 return -EFAULT; 109 mutex_lock(®ister_mutex); 110 device = snd_pcm_next(card, device); 111 mutex_unlock(®ister_mutex); 112 if (put_user(device, (int __user *)arg)) 113 return -EFAULT; 114 return 0; 115 } 116 case SNDRV_CTL_IOCTL_PCM_INFO: 117 { 118 struct snd_pcm_info __user *info; 119 unsigned int device, subdevice; 120 int stream; 121 struct snd_pcm *pcm; 122 struct snd_pcm_str *pstr; 123 struct snd_pcm_substream *substream; 124 int err; 125 126 info = (struct snd_pcm_info __user *)arg; 127 if (get_user(device, &info->device)) 128 return -EFAULT; 129 if (get_user(stream, &info->stream)) 130 return -EFAULT; 131 if (stream < 0 || stream > 1) 132 return -EINVAL; 133 stream = array_index_nospec(stream, 2); 134 if (get_user(subdevice, &info->subdevice)) 135 return -EFAULT; 136 mutex_lock(®ister_mutex); 137 pcm = snd_pcm_get(card, device); 138 if (pcm == NULL) { 139 err = -ENXIO; 140 goto _error; 141 } 142 pstr = &pcm->streams[stream]; 143 if (pstr->substream_count == 0) { 144 err = -ENOENT; 145 goto _error; 146 } 147 if (subdevice >= pstr->substream_count) { 148 err = -ENXIO; 149 goto _error; 150 } 151 for (substream = pstr->substream; substream; 152 substream = substream->next) 153 if (substream->number == (int)subdevice) 154 break; 155 if (substream == NULL) { 156 err = -ENXIO; 157 goto _error; 158 } 159 mutex_lock(&pcm->open_mutex); 160 err = snd_pcm_info_user(substream, info); 161 mutex_unlock(&pcm->open_mutex); 162 _error: 163 mutex_unlock(®ister_mutex); 164 return err; 165 } 166 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 167 { 168 int val; 169 170 if (get_user(val, (int __user *)arg)) 171 return -EFAULT; 172 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val; 173 return 0; 174 } 175 } 176 return -ENOIOCTLCMD; 177 } 178 179 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 180 181 static char *snd_pcm_format_names[] = { 182 FORMAT(S8), 183 FORMAT(U8), 184 FORMAT(S16_LE), 185 FORMAT(S16_BE), 186 FORMAT(U16_LE), 187 FORMAT(U16_BE), 188 FORMAT(S24_LE), 189 FORMAT(S24_BE), 190 FORMAT(U24_LE), 191 FORMAT(U24_BE), 192 FORMAT(S32_LE), 193 FORMAT(S32_BE), 194 FORMAT(U32_LE), 195 FORMAT(U32_BE), 196 FORMAT(FLOAT_LE), 197 FORMAT(FLOAT_BE), 198 FORMAT(FLOAT64_LE), 199 FORMAT(FLOAT64_BE), 200 FORMAT(IEC958_SUBFRAME_LE), 201 FORMAT(IEC958_SUBFRAME_BE), 202 FORMAT(MU_LAW), 203 FORMAT(A_LAW), 204 FORMAT(IMA_ADPCM), 205 FORMAT(MPEG), 206 FORMAT(GSM), 207 FORMAT(SPECIAL), 208 FORMAT(S24_3LE), 209 FORMAT(S24_3BE), 210 FORMAT(U24_3LE), 211 FORMAT(U24_3BE), 212 FORMAT(S20_3LE), 213 FORMAT(S20_3BE), 214 FORMAT(U20_3LE), 215 FORMAT(U20_3BE), 216 FORMAT(S18_3LE), 217 FORMAT(S18_3BE), 218 FORMAT(U18_3LE), 219 FORMAT(U18_3BE), 220 FORMAT(G723_24), 221 FORMAT(G723_24_1B), 222 FORMAT(G723_40), 223 FORMAT(G723_40_1B), 224 FORMAT(DSD_U8), 225 FORMAT(DSD_U16_LE), 226 FORMAT(DSD_U32_LE), 227 FORMAT(DSD_U16_BE), 228 FORMAT(DSD_U32_BE), 229 }; 230 231 /** 232 * snd_pcm_format_name - Return a name string for the given PCM format 233 * @format: PCM format 234 */ 235 const char *snd_pcm_format_name(snd_pcm_format_t format) 236 { 237 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) 238 return "Unknown"; 239 return snd_pcm_format_names[(__force unsigned int)format]; 240 } 241 EXPORT_SYMBOL_GPL(snd_pcm_format_name); 242 243 #ifdef CONFIG_SND_VERBOSE_PROCFS 244 245 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v 246 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 247 #define READY(v) [SNDRV_PCM_READY_##v] = #v 248 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 249 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 250 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 251 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 252 #define START(v) [SNDRV_PCM_START_##v] = #v 253 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 254 255 static char *snd_pcm_stream_names[] = { 256 STREAM(PLAYBACK), 257 STREAM(CAPTURE), 258 }; 259 260 static char *snd_pcm_state_names[] = { 261 STATE(OPEN), 262 STATE(SETUP), 263 STATE(PREPARED), 264 STATE(RUNNING), 265 STATE(XRUN), 266 STATE(DRAINING), 267 STATE(PAUSED), 268 STATE(SUSPENDED), 269 }; 270 271 static char *snd_pcm_access_names[] = { 272 ACCESS(MMAP_INTERLEAVED), 273 ACCESS(MMAP_NONINTERLEAVED), 274 ACCESS(MMAP_COMPLEX), 275 ACCESS(RW_INTERLEAVED), 276 ACCESS(RW_NONINTERLEAVED), 277 }; 278 279 static char *snd_pcm_subformat_names[] = { 280 SUBFORMAT(STD), 281 }; 282 283 static char *snd_pcm_tstamp_mode_names[] = { 284 TSTAMP(NONE), 285 TSTAMP(ENABLE), 286 }; 287 288 static const char *snd_pcm_stream_name(int stream) 289 { 290 return snd_pcm_stream_names[stream]; 291 } 292 293 static const char *snd_pcm_access_name(snd_pcm_access_t access) 294 { 295 return snd_pcm_access_names[(__force int)access]; 296 } 297 298 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 299 { 300 return snd_pcm_subformat_names[(__force int)subformat]; 301 } 302 303 static const char *snd_pcm_tstamp_mode_name(int mode) 304 { 305 return snd_pcm_tstamp_mode_names[mode]; 306 } 307 308 static const char *snd_pcm_state_name(snd_pcm_state_t state) 309 { 310 return snd_pcm_state_names[(__force int)state]; 311 } 312 313 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 314 #include <linux/soundcard.h> 315 316 static const char *snd_pcm_oss_format_name(int format) 317 { 318 switch (format) { 319 case AFMT_MU_LAW: 320 return "MU_LAW"; 321 case AFMT_A_LAW: 322 return "A_LAW"; 323 case AFMT_IMA_ADPCM: 324 return "IMA_ADPCM"; 325 case AFMT_U8: 326 return "U8"; 327 case AFMT_S16_LE: 328 return "S16_LE"; 329 case AFMT_S16_BE: 330 return "S16_BE"; 331 case AFMT_S8: 332 return "S8"; 333 case AFMT_U16_LE: 334 return "U16_LE"; 335 case AFMT_U16_BE: 336 return "U16_BE"; 337 case AFMT_MPEG: 338 return "MPEG"; 339 default: 340 return "unknown"; 341 } 342 } 343 #endif 344 345 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 346 struct snd_info_buffer *buffer) 347 { 348 struct snd_pcm_info *info; 349 int err; 350 351 if (! substream) 352 return; 353 354 info = kmalloc(sizeof(*info), GFP_KERNEL); 355 if (!info) 356 return; 357 358 err = snd_pcm_info(substream, info); 359 if (err < 0) { 360 snd_iprintf(buffer, "error %d\n", err); 361 kfree(info); 362 return; 363 } 364 snd_iprintf(buffer, "card: %d\n", info->card); 365 snd_iprintf(buffer, "device: %d\n", info->device); 366 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 367 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 368 snd_iprintf(buffer, "id: %s\n", info->id); 369 snd_iprintf(buffer, "name: %s\n", info->name); 370 snd_iprintf(buffer, "subname: %s\n", info->subname); 371 snd_iprintf(buffer, "class: %d\n", info->dev_class); 372 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 373 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 374 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 375 kfree(info); 376 } 377 378 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 379 struct snd_info_buffer *buffer) 380 { 381 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 382 buffer); 383 } 384 385 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 386 struct snd_info_buffer *buffer) 387 { 388 snd_pcm_proc_info_read(entry->private_data, buffer); 389 } 390 391 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 392 struct snd_info_buffer *buffer) 393 { 394 struct snd_pcm_substream *substream = entry->private_data; 395 struct snd_pcm_runtime *runtime; 396 397 mutex_lock(&substream->pcm->open_mutex); 398 runtime = substream->runtime; 399 if (!runtime) { 400 snd_iprintf(buffer, "closed\n"); 401 goto unlock; 402 } 403 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 404 snd_iprintf(buffer, "no setup\n"); 405 goto unlock; 406 } 407 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 408 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 409 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 410 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 411 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 412 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 413 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 414 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 415 if (substream->oss.oss) { 416 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 417 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 418 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 419 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 420 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 421 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 422 } 423 #endif 424 unlock: 425 mutex_unlock(&substream->pcm->open_mutex); 426 } 427 428 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 429 struct snd_info_buffer *buffer) 430 { 431 struct snd_pcm_substream *substream = entry->private_data; 432 struct snd_pcm_runtime *runtime; 433 434 mutex_lock(&substream->pcm->open_mutex); 435 runtime = substream->runtime; 436 if (!runtime) { 437 snd_iprintf(buffer, "closed\n"); 438 goto unlock; 439 } 440 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 441 snd_iprintf(buffer, "no setup\n"); 442 goto unlock; 443 } 444 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 445 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 446 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 447 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 448 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 449 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 450 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 451 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 452 unlock: 453 mutex_unlock(&substream->pcm->open_mutex); 454 } 455 456 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 457 struct snd_info_buffer *buffer) 458 { 459 struct snd_pcm_substream *substream = entry->private_data; 460 struct snd_pcm_runtime *runtime; 461 struct snd_pcm_status status; 462 int err; 463 464 mutex_lock(&substream->pcm->open_mutex); 465 runtime = substream->runtime; 466 if (!runtime) { 467 snd_iprintf(buffer, "closed\n"); 468 goto unlock; 469 } 470 memset(&status, 0, sizeof(status)); 471 err = snd_pcm_status(substream, &status); 472 if (err < 0) { 473 snd_iprintf(buffer, "error %d\n", err); 474 goto unlock; 475 } 476 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 477 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); 478 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 479 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 480 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 481 status.tstamp.tv_sec, status.tstamp.tv_nsec); 482 snd_iprintf(buffer, "delay : %ld\n", status.delay); 483 snd_iprintf(buffer, "avail : %ld\n", status.avail); 484 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 485 snd_iprintf(buffer, "-----\n"); 486 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 487 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 488 unlock: 489 mutex_unlock(&substream->pcm->open_mutex); 490 } 491 492 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 493 static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry, 494 struct snd_info_buffer *buffer) 495 { 496 struct snd_pcm_substream *substream = entry->private_data; 497 498 snd_pcm_stop_xrun(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 entry = snd_info_create_card_entry(pcm->card, name, 527 pcm->card->proc_root); 528 if (!entry) 529 return -ENOMEM; 530 entry->mode = S_IFDIR | 0555; 531 pstr->proc_root = entry; 532 entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root); 533 if (entry) 534 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); 535 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 536 entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 537 pstr->proc_root); 538 if (entry) { 539 snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read); 540 entry->c.text.write = snd_pcm_xrun_debug_write; 541 entry->mode |= 0200; 542 } 543 #endif 544 return 0; 545 } 546 547 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 548 { 549 snd_info_free_entry(pstr->proc_root); 550 pstr->proc_root = NULL; 551 return 0; 552 } 553 554 static struct snd_info_entry * 555 create_substream_info_entry(struct snd_pcm_substream *substream, 556 const char *name, 557 void (*read)(struct snd_info_entry *, 558 struct snd_info_buffer *)) 559 { 560 struct snd_info_entry *entry; 561 562 entry = snd_info_create_card_entry(substream->pcm->card, name, 563 substream->proc_root); 564 if (entry) 565 snd_info_set_text_ops(entry, substream, read); 566 return entry; 567 } 568 569 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 570 { 571 struct snd_info_entry *entry; 572 struct snd_card *card; 573 char name[16]; 574 575 card = substream->pcm->card; 576 577 sprintf(name, "sub%i", substream->number); 578 entry = snd_info_create_card_entry(card, name, 579 substream->pstr->proc_root); 580 if (!entry) 581 return -ENOMEM; 582 entry->mode = S_IFDIR | 0555; 583 substream->proc_root = entry; 584 585 create_substream_info_entry(substream, "info", 586 snd_pcm_substream_proc_info_read); 587 create_substream_info_entry(substream, "hw_params", 588 snd_pcm_substream_proc_hw_params_read); 589 create_substream_info_entry(substream, "sw_params", 590 snd_pcm_substream_proc_sw_params_read); 591 create_substream_info_entry(substream, "status", 592 snd_pcm_substream_proc_status_read); 593 594 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 595 entry = create_substream_info_entry(substream, "xrun_injection", NULL); 596 if (entry) { 597 entry->c.text.write = snd_pcm_xrun_injection_write; 598 entry->mode = S_IFREG | 0200; 599 } 600 #endif /* CONFIG_SND_PCM_XRUN_DEBUG */ 601 602 return 0; 603 } 604 605 #else /* !CONFIG_SND_VERBOSE_PROCFS */ 606 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 607 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 608 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 609 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 610 611 static const struct attribute_group *pcm_dev_attr_groups[]; 612 613 /* 614 * PM callbacks: we need to deal only with suspend here, as the resume is 615 * triggered either from user-space or the driver's resume callback 616 */ 617 #ifdef CONFIG_PM_SLEEP 618 static int do_pcm_suspend(struct device *dev) 619 { 620 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev); 621 622 if (!pstr->pcm->no_device_suspend) 623 snd_pcm_suspend_all(pstr->pcm); 624 return 0; 625 } 626 #endif 627 628 static const struct dev_pm_ops pcm_dev_pm_ops = { 629 SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL) 630 }; 631 632 /* device type for PCM -- basically only for passing PM callbacks */ 633 static const struct device_type pcm_dev_type = { 634 .name = "pcm", 635 .pm = &pcm_dev_pm_ops, 636 }; 637 638 /** 639 * snd_pcm_new_stream - create a new PCM stream 640 * @pcm: the pcm instance 641 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 642 * @substream_count: the number of substreams 643 * 644 * Creates a new stream for the pcm. 645 * The corresponding stream on the pcm must have been empty before 646 * calling this, i.e. zero must be given to the argument of 647 * snd_pcm_new(). 648 * 649 * Return: Zero if successful, or a negative error code on failure. 650 */ 651 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 652 { 653 int idx, err; 654 struct snd_pcm_str *pstr = &pcm->streams[stream]; 655 struct snd_pcm_substream *substream, *prev; 656 657 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 658 mutex_init(&pstr->oss.setup_mutex); 659 #endif 660 pstr->stream = stream; 661 pstr->pcm = pcm; 662 pstr->substream_count = substream_count; 663 if (!substream_count) 664 return 0; 665 666 snd_device_initialize(&pstr->dev, pcm->card); 667 pstr->dev.groups = pcm_dev_attr_groups; 668 pstr->dev.type = &pcm_dev_type; 669 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device, 670 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 671 672 if (!pcm->internal) { 673 err = snd_pcm_stream_proc_init(pstr); 674 if (err < 0) { 675 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n"); 676 return err; 677 } 678 } 679 prev = NULL; 680 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 681 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 682 if (!substream) 683 return -ENOMEM; 684 substream->pcm = pcm; 685 substream->pstr = pstr; 686 substream->number = idx; 687 substream->stream = stream; 688 sprintf(substream->name, "subdevice #%i", idx); 689 substream->buffer_bytes_max = UINT_MAX; 690 if (prev == NULL) 691 pstr->substream = substream; 692 else 693 prev->next = substream; 694 695 if (!pcm->internal) { 696 err = snd_pcm_substream_proc_init(substream); 697 if (err < 0) { 698 pcm_err(pcm, 699 "Error in snd_pcm_stream_proc_init\n"); 700 if (prev == NULL) 701 pstr->substream = NULL; 702 else 703 prev->next = NULL; 704 kfree(substream); 705 return err; 706 } 707 } 708 substream->group = &substream->self_group; 709 snd_pcm_group_init(&substream->self_group); 710 list_add_tail(&substream->link_list, &substream->self_group.substreams); 711 atomic_set(&substream->mmap_count, 0); 712 prev = substream; 713 } 714 return 0; 715 } 716 EXPORT_SYMBOL(snd_pcm_new_stream); 717 718 static int _snd_pcm_new(struct snd_card *card, const char *id, int device, 719 int playback_count, int capture_count, bool internal, 720 struct snd_pcm **rpcm) 721 { 722 struct snd_pcm *pcm; 723 int err; 724 static struct snd_device_ops ops = { 725 .dev_free = snd_pcm_dev_free, 726 .dev_register = snd_pcm_dev_register, 727 .dev_disconnect = snd_pcm_dev_disconnect, 728 }; 729 static struct snd_device_ops internal_ops = { 730 .dev_free = snd_pcm_dev_free, 731 }; 732 733 if (snd_BUG_ON(!card)) 734 return -ENXIO; 735 if (rpcm) 736 *rpcm = NULL; 737 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 738 if (!pcm) 739 return -ENOMEM; 740 pcm->card = card; 741 pcm->device = device; 742 pcm->internal = internal; 743 mutex_init(&pcm->open_mutex); 744 init_waitqueue_head(&pcm->open_wait); 745 INIT_LIST_HEAD(&pcm->list); 746 if (id) 747 strlcpy(pcm->id, id, sizeof(pcm->id)); 748 749 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, 750 playback_count); 751 if (err < 0) 752 goto free_pcm; 753 754 err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count); 755 if (err < 0) 756 goto free_pcm; 757 758 err = snd_device_new(card, SNDRV_DEV_PCM, pcm, 759 internal ? &internal_ops : &ops); 760 if (err < 0) 761 goto free_pcm; 762 763 if (rpcm) 764 *rpcm = pcm; 765 return 0; 766 767 free_pcm: 768 snd_pcm_free(pcm); 769 return err; 770 } 771 772 /** 773 * snd_pcm_new - create a new PCM instance 774 * @card: the card instance 775 * @id: the id string 776 * @device: the device index (zero based) 777 * @playback_count: the number of substreams for playback 778 * @capture_count: the number of substreams for capture 779 * @rpcm: the pointer to store the new pcm instance 780 * 781 * Creates a new PCM instance. 782 * 783 * The pcm operators have to be set afterwards to the new instance 784 * via snd_pcm_set_ops(). 785 * 786 * Return: Zero if successful, or a negative error code on failure. 787 */ 788 int snd_pcm_new(struct snd_card *card, const char *id, int device, 789 int playback_count, int capture_count, struct snd_pcm **rpcm) 790 { 791 return _snd_pcm_new(card, id, device, playback_count, capture_count, 792 false, rpcm); 793 } 794 EXPORT_SYMBOL(snd_pcm_new); 795 796 /** 797 * snd_pcm_new_internal - create a new internal PCM instance 798 * @card: the card instance 799 * @id: the id string 800 * @device: the device index (zero based - shared with normal PCMs) 801 * @playback_count: the number of substreams for playback 802 * @capture_count: the number of substreams for capture 803 * @rpcm: the pointer to store the new pcm instance 804 * 805 * Creates a new internal PCM instance with no userspace device or procfs 806 * entries. This is used by ASoC Back End PCMs in order to create a PCM that 807 * will only be used internally by kernel drivers. i.e. it cannot be opened 808 * by userspace. It provides existing ASoC components drivers with a substream 809 * and access to any private data. 810 * 811 * The pcm operators have to be set afterwards to the new instance 812 * via snd_pcm_set_ops(). 813 * 814 * Return: Zero if successful, or a negative error code on failure. 815 */ 816 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 817 int playback_count, int capture_count, 818 struct snd_pcm **rpcm) 819 { 820 return _snd_pcm_new(card, id, device, playback_count, capture_count, 821 true, rpcm); 822 } 823 EXPORT_SYMBOL(snd_pcm_new_internal); 824 825 static void free_chmap(struct snd_pcm_str *pstr) 826 { 827 if (pstr->chmap_kctl) { 828 snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl); 829 pstr->chmap_kctl = NULL; 830 } 831 } 832 833 static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 834 { 835 struct snd_pcm_substream *substream, *substream_next; 836 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 837 struct snd_pcm_oss_setup *setup, *setupn; 838 #endif 839 840 /* free all proc files under the stream */ 841 snd_pcm_stream_proc_done(pstr); 842 843 substream = pstr->substream; 844 while (substream) { 845 substream_next = substream->next; 846 snd_pcm_timer_done(substream); 847 kfree(substream); 848 substream = substream_next; 849 } 850 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 851 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 852 setupn = setup->next; 853 kfree(setup->task_name); 854 kfree(setup); 855 } 856 #endif 857 free_chmap(pstr); 858 if (pstr->substream_count) 859 put_device(&pstr->dev); 860 } 861 862 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 863 #define pcm_call_notify(pcm, call) \ 864 do { \ 865 struct snd_pcm_notify *_notify; \ 866 list_for_each_entry(_notify, &snd_pcm_notify_list, list) \ 867 _notify->call(pcm); \ 868 } while (0) 869 #else 870 #define pcm_call_notify(pcm, call) do {} while (0) 871 #endif 872 873 static int snd_pcm_free(struct snd_pcm *pcm) 874 { 875 if (!pcm) 876 return 0; 877 if (!pcm->internal) 878 pcm_call_notify(pcm, n_unregister); 879 if (pcm->private_free) 880 pcm->private_free(pcm); 881 snd_pcm_lib_preallocate_free_for_all(pcm); 882 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 883 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 884 kfree(pcm); 885 return 0; 886 } 887 888 static int snd_pcm_dev_free(struct snd_device *device) 889 { 890 struct snd_pcm *pcm = device->device_data; 891 return snd_pcm_free(pcm); 892 } 893 894 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 895 struct file *file, 896 struct snd_pcm_substream **rsubstream) 897 { 898 struct snd_pcm_str * pstr; 899 struct snd_pcm_substream *substream; 900 struct snd_pcm_runtime *runtime; 901 struct snd_card *card; 902 int prefer_subdevice; 903 size_t size; 904 905 if (snd_BUG_ON(!pcm || !rsubstream)) 906 return -ENXIO; 907 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK && 908 stream != SNDRV_PCM_STREAM_CAPTURE)) 909 return -EINVAL; 910 *rsubstream = NULL; 911 pstr = &pcm->streams[stream]; 912 if (pstr->substream == NULL || pstr->substream_count == 0) 913 return -ENODEV; 914 915 card = pcm->card; 916 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM); 917 918 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 919 int opposite = !stream; 920 921 for (substream = pcm->streams[opposite].substream; substream; 922 substream = substream->next) { 923 if (SUBSTREAM_BUSY(substream)) 924 return -EAGAIN; 925 } 926 } 927 928 if (file->f_flags & O_APPEND) { 929 if (prefer_subdevice < 0) { 930 if (pstr->substream_count > 1) 931 return -EINVAL; /* must be unique */ 932 substream = pstr->substream; 933 } else { 934 for (substream = pstr->substream; substream; 935 substream = substream->next) 936 if (substream->number == prefer_subdevice) 937 break; 938 } 939 if (! substream) 940 return -ENODEV; 941 if (! SUBSTREAM_BUSY(substream)) 942 return -EBADFD; 943 substream->ref_count++; 944 *rsubstream = substream; 945 return 0; 946 } 947 948 for (substream = pstr->substream; substream; substream = substream->next) { 949 if (!SUBSTREAM_BUSY(substream) && 950 (prefer_subdevice == -1 || 951 substream->number == prefer_subdevice)) 952 break; 953 } 954 if (substream == NULL) 955 return -EAGAIN; 956 957 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 958 if (runtime == NULL) 959 return -ENOMEM; 960 961 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 962 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 963 if (runtime->status == NULL) { 964 kfree(runtime); 965 return -ENOMEM; 966 } 967 memset((void*)runtime->status, 0, size); 968 969 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 970 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 971 if (runtime->control == NULL) { 972 snd_free_pages((void*)runtime->status, 973 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 974 kfree(runtime); 975 return -ENOMEM; 976 } 977 memset((void*)runtime->control, 0, size); 978 979 init_waitqueue_head(&runtime->sleep); 980 init_waitqueue_head(&runtime->tsleep); 981 982 runtime->status->state = SNDRV_PCM_STATE_OPEN; 983 984 substream->runtime = runtime; 985 substream->private_data = pcm->private_data; 986 substream->ref_count = 1; 987 substream->f_flags = file->f_flags; 988 substream->pid = get_pid(task_pid(current)); 989 pstr->substream_opened++; 990 *rsubstream = substream; 991 return 0; 992 } 993 994 void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 995 { 996 struct snd_pcm_runtime *runtime; 997 998 if (PCM_RUNTIME_CHECK(substream)) 999 return; 1000 runtime = substream->runtime; 1001 if (runtime->private_free != NULL) 1002 runtime->private_free(runtime); 1003 snd_free_pages((void*)runtime->status, 1004 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 1005 snd_free_pages((void*)runtime->control, 1006 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 1007 kfree(runtime->hw_constraints.rules); 1008 /* Avoid concurrent access to runtime via PCM timer interface */ 1009 if (substream->timer) 1010 spin_lock_irq(&substream->timer->lock); 1011 substream->runtime = NULL; 1012 if (substream->timer) 1013 spin_unlock_irq(&substream->timer->lock); 1014 kfree(runtime); 1015 put_pid(substream->pid); 1016 substream->pid = NULL; 1017 substream->pstr->substream_opened--; 1018 } 1019 1020 static ssize_t show_pcm_class(struct device *dev, 1021 struct device_attribute *attr, char *buf) 1022 { 1023 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev); 1024 struct snd_pcm *pcm = pstr->pcm; 1025 const char *str; 1026 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 1027 [SNDRV_PCM_CLASS_GENERIC] = "generic", 1028 [SNDRV_PCM_CLASS_MULTI] = "multi", 1029 [SNDRV_PCM_CLASS_MODEM] = "modem", 1030 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 1031 }; 1032 1033 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST) 1034 str = "none"; 1035 else 1036 str = strs[pcm->dev_class]; 1037 return snprintf(buf, PAGE_SIZE, "%s\n", str); 1038 } 1039 1040 static DEVICE_ATTR(pcm_class, 0444, show_pcm_class, NULL); 1041 static struct attribute *pcm_dev_attrs[] = { 1042 &dev_attr_pcm_class.attr, 1043 NULL 1044 }; 1045 1046 static const struct attribute_group pcm_dev_attr_group = { 1047 .attrs = pcm_dev_attrs, 1048 }; 1049 1050 static const struct attribute_group *pcm_dev_attr_groups[] = { 1051 &pcm_dev_attr_group, 1052 NULL 1053 }; 1054 1055 static int snd_pcm_dev_register(struct snd_device *device) 1056 { 1057 int cidx, err; 1058 struct snd_pcm_substream *substream; 1059 struct snd_pcm *pcm; 1060 1061 if (snd_BUG_ON(!device || !device->device_data)) 1062 return -ENXIO; 1063 pcm = device->device_data; 1064 1065 mutex_lock(®ister_mutex); 1066 err = snd_pcm_add(pcm); 1067 if (err) 1068 goto unlock; 1069 for (cidx = 0; cidx < 2; cidx++) { 1070 int devtype = -1; 1071 if (pcm->streams[cidx].substream == NULL) 1072 continue; 1073 switch (cidx) { 1074 case SNDRV_PCM_STREAM_PLAYBACK: 1075 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1076 break; 1077 case SNDRV_PCM_STREAM_CAPTURE: 1078 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1079 break; 1080 } 1081 /* register pcm */ 1082 err = snd_register_device(devtype, pcm->card, pcm->device, 1083 &snd_pcm_f_ops[cidx], pcm, 1084 &pcm->streams[cidx].dev); 1085 if (err < 0) { 1086 list_del_init(&pcm->list); 1087 goto unlock; 1088 } 1089 1090 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1091 snd_pcm_timer_init(substream); 1092 } 1093 1094 pcm_call_notify(pcm, n_register); 1095 1096 unlock: 1097 mutex_unlock(®ister_mutex); 1098 return err; 1099 } 1100 1101 static int snd_pcm_dev_disconnect(struct snd_device *device) 1102 { 1103 struct snd_pcm *pcm = device->device_data; 1104 struct snd_pcm_substream *substream; 1105 int cidx; 1106 1107 mutex_lock(®ister_mutex); 1108 mutex_lock(&pcm->open_mutex); 1109 wake_up(&pcm->open_wait); 1110 list_del_init(&pcm->list); 1111 for (cidx = 0; cidx < 2; cidx++) { 1112 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { 1113 snd_pcm_stream_lock_irq(substream); 1114 if (substream->runtime) { 1115 if (snd_pcm_running(substream)) 1116 snd_pcm_stop(substream, 1117 SNDRV_PCM_STATE_DISCONNECTED); 1118 /* to be sure, set the state unconditionally */ 1119 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1120 wake_up(&substream->runtime->sleep); 1121 wake_up(&substream->runtime->tsleep); 1122 } 1123 snd_pcm_stream_unlock_irq(substream); 1124 } 1125 } 1126 1127 pcm_call_notify(pcm, n_disconnect); 1128 for (cidx = 0; cidx < 2; cidx++) { 1129 snd_unregister_device(&pcm->streams[cidx].dev); 1130 free_chmap(&pcm->streams[cidx]); 1131 } 1132 mutex_unlock(&pcm->open_mutex); 1133 mutex_unlock(®ister_mutex); 1134 return 0; 1135 } 1136 1137 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 1138 /** 1139 * snd_pcm_notify - Add/remove the notify list 1140 * @notify: PCM notify list 1141 * @nfree: 0 = register, 1 = unregister 1142 * 1143 * This adds the given notifier to the global list so that the callback is 1144 * called for each registered PCM devices. This exists only for PCM OSS 1145 * emulation, so far. 1146 */ 1147 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1148 { 1149 struct snd_pcm *pcm; 1150 1151 if (snd_BUG_ON(!notify || 1152 !notify->n_register || 1153 !notify->n_unregister || 1154 !notify->n_disconnect)) 1155 return -EINVAL; 1156 mutex_lock(®ister_mutex); 1157 if (nfree) { 1158 list_del(¬ify->list); 1159 list_for_each_entry(pcm, &snd_pcm_devices, list) 1160 notify->n_unregister(pcm); 1161 } else { 1162 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1163 list_for_each_entry(pcm, &snd_pcm_devices, list) 1164 notify->n_register(pcm); 1165 } 1166 mutex_unlock(®ister_mutex); 1167 return 0; 1168 } 1169 EXPORT_SYMBOL(snd_pcm_notify); 1170 #endif /* CONFIG_SND_PCM_OSS */ 1171 1172 #ifdef CONFIG_SND_PROC_FS 1173 /* 1174 * Info interface 1175 */ 1176 1177 static void snd_pcm_proc_read(struct snd_info_entry *entry, 1178 struct snd_info_buffer *buffer) 1179 { 1180 struct snd_pcm *pcm; 1181 1182 mutex_lock(®ister_mutex); 1183 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1184 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1185 pcm->card->number, pcm->device, pcm->id, pcm->name); 1186 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1187 snd_iprintf(buffer, " : playback %i", 1188 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1189 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1190 snd_iprintf(buffer, " : capture %i", 1191 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1192 snd_iprintf(buffer, "\n"); 1193 } 1194 mutex_unlock(®ister_mutex); 1195 } 1196 1197 static struct snd_info_entry *snd_pcm_proc_entry; 1198 1199 static void snd_pcm_proc_init(void) 1200 { 1201 struct snd_info_entry *entry; 1202 1203 entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL); 1204 if (entry) { 1205 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1206 if (snd_info_register(entry) < 0) { 1207 snd_info_free_entry(entry); 1208 entry = NULL; 1209 } 1210 } 1211 snd_pcm_proc_entry = entry; 1212 } 1213 1214 static void snd_pcm_proc_done(void) 1215 { 1216 snd_info_free_entry(snd_pcm_proc_entry); 1217 } 1218 1219 #else /* !CONFIG_SND_PROC_FS */ 1220 #define snd_pcm_proc_init() 1221 #define snd_pcm_proc_done() 1222 #endif /* CONFIG_SND_PROC_FS */ 1223 1224 1225 /* 1226 * ENTRY functions 1227 */ 1228 1229 static int __init alsa_pcm_init(void) 1230 { 1231 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1232 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1233 snd_pcm_proc_init(); 1234 return 0; 1235 } 1236 1237 static void __exit alsa_pcm_exit(void) 1238 { 1239 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1240 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1241 snd_pcm_proc_done(); 1242 } 1243 1244 module_init(alsa_pcm_init) 1245 module_exit(alsa_pcm_exit) 1246