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