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