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/time.h> 25 #include <linux/mutex.h> 26 #include <sound/core.h> 27 #include <sound/minors.h> 28 #include <sound/pcm.h> 29 #include <sound/control.h> 30 #include <sound/info.h> 31 32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 34 MODULE_LICENSE("GPL"); 35 36 static LIST_HEAD(snd_pcm_devices); 37 static LIST_HEAD(snd_pcm_notify_list); 38 static DEFINE_MUTEX(register_mutex); 39 40 static int snd_pcm_free(struct snd_pcm *pcm); 41 static int snd_pcm_dev_free(struct snd_device *device); 42 static int snd_pcm_dev_register(struct snd_device *device); 43 static int snd_pcm_dev_disconnect(struct snd_device *device); 44 45 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device) 46 { 47 struct snd_pcm *pcm; 48 49 list_for_each_entry(pcm, &snd_pcm_devices, list) { 50 if (pcm->card == card && pcm->device == device) 51 return pcm; 52 } 53 return NULL; 54 } 55 56 static int snd_pcm_next(struct snd_card *card, int device) 57 { 58 struct snd_pcm *pcm; 59 60 list_for_each_entry(pcm, &snd_pcm_devices, list) { 61 if (pcm->card == card && pcm->device > device) 62 return pcm->device; 63 else if (pcm->card->number > card->number) 64 return -1; 65 } 66 return -1; 67 } 68 69 static int snd_pcm_add(struct snd_pcm *newpcm) 70 { 71 struct snd_pcm *pcm; 72 73 list_for_each_entry(pcm, &snd_pcm_devices, list) { 74 if (pcm->card == newpcm->card && pcm->device == newpcm->device) 75 return -EBUSY; 76 if (pcm->card->number > newpcm->card->number || 77 (pcm->card == newpcm->card && 78 pcm->device > newpcm->device)) { 79 list_add(&newpcm->list, pcm->list.prev); 80 return 0; 81 } 82 } 83 list_add_tail(&newpcm->list, &snd_pcm_devices); 84 return 0; 85 } 86 87 static int snd_pcm_control_ioctl(struct snd_card *card, 88 struct snd_ctl_file *control, 89 unsigned int cmd, unsigned long arg) 90 { 91 switch (cmd) { 92 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 93 { 94 int device; 95 96 if (get_user(device, (int __user *)arg)) 97 return -EFAULT; 98 mutex_lock(®ister_mutex); 99 device = snd_pcm_next(card, device); 100 mutex_unlock(®ister_mutex); 101 if (put_user(device, (int __user *)arg)) 102 return -EFAULT; 103 return 0; 104 } 105 case SNDRV_CTL_IOCTL_PCM_INFO: 106 { 107 struct snd_pcm_info __user *info; 108 unsigned int device, subdevice; 109 int stream; 110 struct snd_pcm *pcm; 111 struct snd_pcm_str *pstr; 112 struct snd_pcm_substream *substream; 113 int err; 114 115 info = (struct snd_pcm_info __user *)arg; 116 if (get_user(device, &info->device)) 117 return -EFAULT; 118 if (get_user(stream, &info->stream)) 119 return -EFAULT; 120 if (stream < 0 || stream > 1) 121 return -EINVAL; 122 if (get_user(subdevice, &info->subdevice)) 123 return -EFAULT; 124 mutex_lock(®ister_mutex); 125 pcm = snd_pcm_get(card, device); 126 if (pcm == NULL) { 127 err = -ENXIO; 128 goto _error; 129 } 130 pstr = &pcm->streams[stream]; 131 if (pstr->substream_count == 0) { 132 err = -ENOENT; 133 goto _error; 134 } 135 if (subdevice >= pstr->substream_count) { 136 err = -ENXIO; 137 goto _error; 138 } 139 for (substream = pstr->substream; substream; 140 substream = substream->next) 141 if (substream->number == (int)subdevice) 142 break; 143 if (substream == NULL) { 144 err = -ENXIO; 145 goto _error; 146 } 147 err = snd_pcm_info_user(substream, info); 148 _error: 149 mutex_unlock(®ister_mutex); 150 return err; 151 } 152 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 153 { 154 int val; 155 156 if (get_user(val, (int __user *)arg)) 157 return -EFAULT; 158 control->prefer_pcm_subdevice = val; 159 return 0; 160 } 161 } 162 return -ENOIOCTLCMD; 163 } 164 165 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 166 167 static char *snd_pcm_format_names[] = { 168 FORMAT(S8), 169 FORMAT(U8), 170 FORMAT(S16_LE), 171 FORMAT(S16_BE), 172 FORMAT(U16_LE), 173 FORMAT(U16_BE), 174 FORMAT(S24_LE), 175 FORMAT(S24_BE), 176 FORMAT(U24_LE), 177 FORMAT(U24_BE), 178 FORMAT(S32_LE), 179 FORMAT(S32_BE), 180 FORMAT(U32_LE), 181 FORMAT(U32_BE), 182 FORMAT(FLOAT_LE), 183 FORMAT(FLOAT_BE), 184 FORMAT(FLOAT64_LE), 185 FORMAT(FLOAT64_BE), 186 FORMAT(IEC958_SUBFRAME_LE), 187 FORMAT(IEC958_SUBFRAME_BE), 188 FORMAT(MU_LAW), 189 FORMAT(A_LAW), 190 FORMAT(IMA_ADPCM), 191 FORMAT(MPEG), 192 FORMAT(GSM), 193 FORMAT(SPECIAL), 194 FORMAT(S24_3LE), 195 FORMAT(S24_3BE), 196 FORMAT(U24_3LE), 197 FORMAT(U24_3BE), 198 FORMAT(S20_3LE), 199 FORMAT(S20_3BE), 200 FORMAT(U20_3LE), 201 FORMAT(U20_3BE), 202 FORMAT(S18_3LE), 203 FORMAT(S18_3BE), 204 FORMAT(U18_3LE), 205 FORMAT(U18_3BE), 206 FORMAT(G723_24), 207 FORMAT(G723_24_1B), 208 FORMAT(G723_40), 209 FORMAT(G723_40_1B), 210 }; 211 212 const char *snd_pcm_format_name(snd_pcm_format_t format) 213 { 214 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names)) 215 return "Unknown"; 216 return snd_pcm_format_names[(__force unsigned int)format]; 217 } 218 EXPORT_SYMBOL_GPL(snd_pcm_format_name); 219 220 #ifdef CONFIG_SND_VERBOSE_PROCFS 221 222 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v 223 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 224 #define READY(v) [SNDRV_PCM_READY_##v] = #v 225 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 226 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 227 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 228 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 229 #define START(v) [SNDRV_PCM_START_##v] = #v 230 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 231 232 static char *snd_pcm_stream_names[] = { 233 STREAM(PLAYBACK), 234 STREAM(CAPTURE), 235 }; 236 237 static char *snd_pcm_state_names[] = { 238 STATE(OPEN), 239 STATE(SETUP), 240 STATE(PREPARED), 241 STATE(RUNNING), 242 STATE(XRUN), 243 STATE(DRAINING), 244 STATE(PAUSED), 245 STATE(SUSPENDED), 246 }; 247 248 static char *snd_pcm_access_names[] = { 249 ACCESS(MMAP_INTERLEAVED), 250 ACCESS(MMAP_NONINTERLEAVED), 251 ACCESS(MMAP_COMPLEX), 252 ACCESS(RW_INTERLEAVED), 253 ACCESS(RW_NONINTERLEAVED), 254 }; 255 256 static char *snd_pcm_subformat_names[] = { 257 SUBFORMAT(STD), 258 }; 259 260 static char *snd_pcm_tstamp_mode_names[] = { 261 TSTAMP(NONE), 262 TSTAMP(ENABLE), 263 }; 264 265 static const char *snd_pcm_stream_name(int stream) 266 { 267 return snd_pcm_stream_names[stream]; 268 } 269 270 static const char *snd_pcm_access_name(snd_pcm_access_t access) 271 { 272 return snd_pcm_access_names[(__force int)access]; 273 } 274 275 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 276 { 277 return snd_pcm_subformat_names[(__force int)subformat]; 278 } 279 280 static const char *snd_pcm_tstamp_mode_name(int mode) 281 { 282 return snd_pcm_tstamp_mode_names[mode]; 283 } 284 285 static const char *snd_pcm_state_name(snd_pcm_state_t state) 286 { 287 return snd_pcm_state_names[(__force int)state]; 288 } 289 290 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 291 #include <linux/soundcard.h> 292 293 static const char *snd_pcm_oss_format_name(int format) 294 { 295 switch (format) { 296 case AFMT_MU_LAW: 297 return "MU_LAW"; 298 case AFMT_A_LAW: 299 return "A_LAW"; 300 case AFMT_IMA_ADPCM: 301 return "IMA_ADPCM"; 302 case AFMT_U8: 303 return "U8"; 304 case AFMT_S16_LE: 305 return "S16_LE"; 306 case AFMT_S16_BE: 307 return "S16_BE"; 308 case AFMT_S8: 309 return "S8"; 310 case AFMT_U16_LE: 311 return "U16_LE"; 312 case AFMT_U16_BE: 313 return "U16_BE"; 314 case AFMT_MPEG: 315 return "MPEG"; 316 default: 317 return "unknown"; 318 } 319 } 320 #endif 321 322 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 323 struct snd_info_buffer *buffer) 324 { 325 struct snd_pcm_info *info; 326 int err; 327 328 if (! substream) 329 return; 330 331 info = kmalloc(sizeof(*info), GFP_KERNEL); 332 if (! info) { 333 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 334 return; 335 } 336 337 err = snd_pcm_info(substream, info); 338 if (err < 0) { 339 snd_iprintf(buffer, "error %d\n", err); 340 kfree(info); 341 return; 342 } 343 snd_iprintf(buffer, "card: %d\n", info->card); 344 snd_iprintf(buffer, "device: %d\n", info->device); 345 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 346 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 347 snd_iprintf(buffer, "id: %s\n", info->id); 348 snd_iprintf(buffer, "name: %s\n", info->name); 349 snd_iprintf(buffer, "subname: %s\n", info->subname); 350 snd_iprintf(buffer, "class: %d\n", info->dev_class); 351 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 352 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 353 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 354 kfree(info); 355 } 356 357 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 358 struct snd_info_buffer *buffer) 359 { 360 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 361 buffer); 362 } 363 364 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 365 struct snd_info_buffer *buffer) 366 { 367 snd_pcm_proc_info_read(entry->private_data, buffer); 368 } 369 370 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 371 struct snd_info_buffer *buffer) 372 { 373 struct snd_pcm_substream *substream = entry->private_data; 374 struct snd_pcm_runtime *runtime; 375 376 mutex_lock(&substream->pcm->open_mutex); 377 runtime = substream->runtime; 378 if (!runtime) { 379 snd_iprintf(buffer, "closed\n"); 380 goto unlock; 381 } 382 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 383 snd_iprintf(buffer, "no setup\n"); 384 goto unlock; 385 } 386 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 387 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 388 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 389 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 390 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 391 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 392 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 393 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 394 if (substream->oss.oss) { 395 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 396 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 397 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 398 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 399 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 400 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 401 } 402 #endif 403 unlock: 404 mutex_unlock(&substream->pcm->open_mutex); 405 } 406 407 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 408 struct snd_info_buffer *buffer) 409 { 410 struct snd_pcm_substream *substream = entry->private_data; 411 struct snd_pcm_runtime *runtime; 412 413 mutex_lock(&substream->pcm->open_mutex); 414 runtime = substream->runtime; 415 if (!runtime) { 416 snd_iprintf(buffer, "closed\n"); 417 goto unlock; 418 } 419 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 420 snd_iprintf(buffer, "no setup\n"); 421 goto unlock; 422 } 423 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 424 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 425 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 426 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 427 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 428 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 429 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 430 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 431 unlock: 432 mutex_unlock(&substream->pcm->open_mutex); 433 } 434 435 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 436 struct snd_info_buffer *buffer) 437 { 438 struct snd_pcm_substream *substream = entry->private_data; 439 struct snd_pcm_runtime *runtime; 440 struct snd_pcm_status status; 441 int err; 442 443 mutex_lock(&substream->pcm->open_mutex); 444 runtime = substream->runtime; 445 if (!runtime) { 446 snd_iprintf(buffer, "closed\n"); 447 goto unlock; 448 } 449 memset(&status, 0, sizeof(status)); 450 err = snd_pcm_status(substream, &status); 451 if (err < 0) { 452 snd_iprintf(buffer, "error %d\n", err); 453 goto unlock; 454 } 455 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 456 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); 457 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 458 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 459 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 460 status.tstamp.tv_sec, status.tstamp.tv_nsec); 461 snd_iprintf(buffer, "delay : %ld\n", status.delay); 462 snd_iprintf(buffer, "avail : %ld\n", status.avail); 463 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 464 snd_iprintf(buffer, "-----\n"); 465 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 466 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 467 unlock: 468 mutex_unlock(&substream->pcm->open_mutex); 469 } 470 471 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 472 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 473 struct snd_info_buffer *buffer) 474 { 475 struct snd_pcm_str *pstr = entry->private_data; 476 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 477 } 478 479 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 480 struct snd_info_buffer *buffer) 481 { 482 struct snd_pcm_str *pstr = entry->private_data; 483 char line[64]; 484 if (!snd_info_get_line(buffer, line, sizeof(line))) 485 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 486 } 487 #endif 488 489 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 490 { 491 struct snd_pcm *pcm = pstr->pcm; 492 struct snd_info_entry *entry; 493 char name[16]; 494 495 sprintf(name, "pcm%i%c", pcm->device, 496 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 497 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 498 return -ENOMEM; 499 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 500 if (snd_info_register(entry) < 0) { 501 snd_info_free_entry(entry); 502 return -ENOMEM; 503 } 504 pstr->proc_root = entry; 505 506 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 507 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); 508 if (snd_info_register(entry) < 0) { 509 snd_info_free_entry(entry); 510 entry = NULL; 511 } 512 } 513 pstr->proc_info_entry = entry; 514 515 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 516 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 517 pstr->proc_root)) != NULL) { 518 entry->c.text.read = snd_pcm_xrun_debug_read; 519 entry->c.text.write = snd_pcm_xrun_debug_write; 520 entry->mode |= S_IWUSR; 521 entry->private_data = pstr; 522 if (snd_info_register(entry) < 0) { 523 snd_info_free_entry(entry); 524 entry = NULL; 525 } 526 } 527 pstr->proc_xrun_debug_entry = entry; 528 #endif 529 return 0; 530 } 531 532 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 533 { 534 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 535 snd_info_free_entry(pstr->proc_xrun_debug_entry); 536 pstr->proc_xrun_debug_entry = NULL; 537 #endif 538 snd_info_free_entry(pstr->proc_info_entry); 539 pstr->proc_info_entry = NULL; 540 snd_info_free_entry(pstr->proc_root); 541 pstr->proc_root = NULL; 542 return 0; 543 } 544 545 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 546 { 547 struct snd_info_entry *entry; 548 struct snd_card *card; 549 char name[16]; 550 551 card = substream->pcm->card; 552 553 sprintf(name, "sub%i", substream->number); 554 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 555 return -ENOMEM; 556 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 557 if (snd_info_register(entry) < 0) { 558 snd_info_free_entry(entry); 559 return -ENOMEM; 560 } 561 substream->proc_root = entry; 562 563 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 564 snd_info_set_text_ops(entry, substream, 565 snd_pcm_substream_proc_info_read); 566 if (snd_info_register(entry) < 0) { 567 snd_info_free_entry(entry); 568 entry = NULL; 569 } 570 } 571 substream->proc_info_entry = entry; 572 573 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 574 snd_info_set_text_ops(entry, substream, 575 snd_pcm_substream_proc_hw_params_read); 576 if (snd_info_register(entry) < 0) { 577 snd_info_free_entry(entry); 578 entry = NULL; 579 } 580 } 581 substream->proc_hw_params_entry = entry; 582 583 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 584 snd_info_set_text_ops(entry, substream, 585 snd_pcm_substream_proc_sw_params_read); 586 if (snd_info_register(entry) < 0) { 587 snd_info_free_entry(entry); 588 entry = NULL; 589 } 590 } 591 substream->proc_sw_params_entry = entry; 592 593 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 594 snd_info_set_text_ops(entry, substream, 595 snd_pcm_substream_proc_status_read); 596 if (snd_info_register(entry) < 0) { 597 snd_info_free_entry(entry); 598 entry = NULL; 599 } 600 } 601 substream->proc_status_entry = entry; 602 603 return 0; 604 } 605 606 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 607 { 608 snd_info_free_entry(substream->proc_info_entry); 609 substream->proc_info_entry = NULL; 610 snd_info_free_entry(substream->proc_hw_params_entry); 611 substream->proc_hw_params_entry = NULL; 612 snd_info_free_entry(substream->proc_sw_params_entry); 613 substream->proc_sw_params_entry = NULL; 614 snd_info_free_entry(substream->proc_status_entry); 615 substream->proc_status_entry = NULL; 616 snd_info_free_entry(substream->proc_root); 617 substream->proc_root = NULL; 618 return 0; 619 } 620 #else /* !CONFIG_SND_VERBOSE_PROCFS */ 621 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 622 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 623 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 624 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 625 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 626 627 /** 628 * snd_pcm_new_stream - create a new PCM stream 629 * @pcm: the pcm instance 630 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 631 * @substream_count: the number of substreams 632 * 633 * Creates a new stream for the pcm. 634 * The corresponding stream on the pcm must have been empty before 635 * calling this, i.e. zero must be given to the argument of 636 * snd_pcm_new(). 637 * 638 * Returns zero if successful, or a negative error code on failure. 639 */ 640 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 641 { 642 int idx, err; 643 struct snd_pcm_str *pstr = &pcm->streams[stream]; 644 struct snd_pcm_substream *substream, *prev; 645 646 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 647 mutex_init(&pstr->oss.setup_mutex); 648 #endif 649 pstr->stream = stream; 650 pstr->pcm = pcm; 651 pstr->substream_count = substream_count; 652 if (substream_count > 0) { 653 err = snd_pcm_stream_proc_init(pstr); 654 if (err < 0) { 655 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 656 return err; 657 } 658 } 659 prev = NULL; 660 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 661 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 662 if (substream == NULL) { 663 snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); 664 return -ENOMEM; 665 } 666 substream->pcm = pcm; 667 substream->pstr = pstr; 668 substream->number = idx; 669 substream->stream = stream; 670 sprintf(substream->name, "subdevice #%i", idx); 671 substream->buffer_bytes_max = UINT_MAX; 672 if (prev == NULL) 673 pstr->substream = substream; 674 else 675 prev->next = substream; 676 err = snd_pcm_substream_proc_init(substream); 677 if (err < 0) { 678 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 679 if (prev == NULL) 680 pstr->substream = NULL; 681 else 682 prev->next = NULL; 683 kfree(substream); 684 return err; 685 } 686 substream->group = &substream->self_group; 687 spin_lock_init(&substream->self_group.lock); 688 INIT_LIST_HEAD(&substream->self_group.substreams); 689 list_add_tail(&substream->link_list, &substream->self_group.substreams); 690 atomic_set(&substream->mmap_count, 0); 691 prev = substream; 692 } 693 return 0; 694 } 695 696 EXPORT_SYMBOL(snd_pcm_new_stream); 697 698 /** 699 * snd_pcm_new - create a new PCM instance 700 * @card: the card instance 701 * @id: the id string 702 * @device: the device index (zero based) 703 * @playback_count: the number of substreams for playback 704 * @capture_count: the number of substreams for capture 705 * @rpcm: the pointer to store the new pcm instance 706 * 707 * Creates a new PCM instance. 708 * 709 * The pcm operators have to be set afterwards to the new instance 710 * via snd_pcm_set_ops(). 711 * 712 * Returns zero if successful, or a negative error code on failure. 713 */ 714 int snd_pcm_new(struct snd_card *card, const char *id, int device, 715 int playback_count, int capture_count, 716 struct snd_pcm ** rpcm) 717 { 718 struct snd_pcm *pcm; 719 int err; 720 static struct snd_device_ops ops = { 721 .dev_free = snd_pcm_dev_free, 722 .dev_register = snd_pcm_dev_register, 723 .dev_disconnect = snd_pcm_dev_disconnect, 724 }; 725 726 if (snd_BUG_ON(!card)) 727 return -ENXIO; 728 if (rpcm) 729 *rpcm = NULL; 730 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 731 if (pcm == NULL) { 732 snd_printk(KERN_ERR "Cannot allocate PCM\n"); 733 return -ENOMEM; 734 } 735 pcm->card = card; 736 pcm->device = device; 737 if (id) 738 strlcpy(pcm->id, id, sizeof(pcm->id)); 739 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 740 snd_pcm_free(pcm); 741 return err; 742 } 743 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 744 snd_pcm_free(pcm); 745 return err; 746 } 747 mutex_init(&pcm->open_mutex); 748 init_waitqueue_head(&pcm->open_wait); 749 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 750 snd_pcm_free(pcm); 751 return err; 752 } 753 if (rpcm) 754 *rpcm = pcm; 755 return 0; 756 } 757 758 EXPORT_SYMBOL(snd_pcm_new); 759 760 static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 761 { 762 struct snd_pcm_substream *substream, *substream_next; 763 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 764 struct snd_pcm_oss_setup *setup, *setupn; 765 #endif 766 substream = pstr->substream; 767 while (substream) { 768 substream_next = substream->next; 769 snd_pcm_timer_done(substream); 770 snd_pcm_substream_proc_done(substream); 771 kfree(substream); 772 substream = substream_next; 773 } 774 snd_pcm_stream_proc_done(pstr); 775 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 776 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 777 setupn = setup->next; 778 kfree(setup->task_name); 779 kfree(setup); 780 } 781 #endif 782 } 783 784 static int snd_pcm_free(struct snd_pcm *pcm) 785 { 786 struct snd_pcm_notify *notify; 787 788 if (!pcm) 789 return 0; 790 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 791 notify->n_unregister(pcm); 792 } 793 if (pcm->private_free) 794 pcm->private_free(pcm); 795 snd_pcm_lib_preallocate_free_for_all(pcm); 796 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 797 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 798 kfree(pcm); 799 return 0; 800 } 801 802 static int snd_pcm_dev_free(struct snd_device *device) 803 { 804 struct snd_pcm *pcm = device->device_data; 805 return snd_pcm_free(pcm); 806 } 807 808 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 809 struct file *file, 810 struct snd_pcm_substream **rsubstream) 811 { 812 struct snd_pcm_str * pstr; 813 struct snd_pcm_substream *substream; 814 struct snd_pcm_runtime *runtime; 815 struct snd_ctl_file *kctl; 816 struct snd_card *card; 817 int prefer_subdevice = -1; 818 size_t size; 819 820 if (snd_BUG_ON(!pcm || !rsubstream)) 821 return -ENXIO; 822 *rsubstream = NULL; 823 pstr = &pcm->streams[stream]; 824 if (pstr->substream == NULL || pstr->substream_count == 0) 825 return -ENODEV; 826 827 card = pcm->card; 828 read_lock(&card->ctl_files_rwlock); 829 list_for_each_entry(kctl, &card->ctl_files, list) { 830 if (kctl->pid == task_pid(current)) { 831 prefer_subdevice = kctl->prefer_pcm_subdevice; 832 if (prefer_subdevice != -1) 833 break; 834 } 835 } 836 read_unlock(&card->ctl_files_rwlock); 837 838 switch (stream) { 839 case SNDRV_PCM_STREAM_PLAYBACK: 840 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 841 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 842 if (SUBSTREAM_BUSY(substream)) 843 return -EAGAIN; 844 } 845 } 846 break; 847 case SNDRV_PCM_STREAM_CAPTURE: 848 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 849 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 850 if (SUBSTREAM_BUSY(substream)) 851 return -EAGAIN; 852 } 853 } 854 break; 855 default: 856 return -EINVAL; 857 } 858 859 if (file->f_flags & O_APPEND) { 860 if (prefer_subdevice < 0) { 861 if (pstr->substream_count > 1) 862 return -EINVAL; /* must be unique */ 863 substream = pstr->substream; 864 } else { 865 for (substream = pstr->substream; substream; 866 substream = substream->next) 867 if (substream->number == prefer_subdevice) 868 break; 869 } 870 if (! substream) 871 return -ENODEV; 872 if (! SUBSTREAM_BUSY(substream)) 873 return -EBADFD; 874 substream->ref_count++; 875 *rsubstream = substream; 876 return 0; 877 } 878 879 if (prefer_subdevice >= 0) { 880 for (substream = pstr->substream; substream; substream = substream->next) 881 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 882 goto __ok; 883 } 884 for (substream = pstr->substream; substream; substream = substream->next) 885 if (!SUBSTREAM_BUSY(substream)) 886 break; 887 __ok: 888 if (substream == NULL) 889 return -EAGAIN; 890 891 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 892 if (runtime == NULL) 893 return -ENOMEM; 894 895 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 896 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 897 if (runtime->status == NULL) { 898 kfree(runtime); 899 return -ENOMEM; 900 } 901 memset((void*)runtime->status, 0, size); 902 903 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 904 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 905 if (runtime->control == NULL) { 906 snd_free_pages((void*)runtime->status, 907 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 908 kfree(runtime); 909 return -ENOMEM; 910 } 911 memset((void*)runtime->control, 0, size); 912 913 init_waitqueue_head(&runtime->sleep); 914 init_waitqueue_head(&runtime->tsleep); 915 916 runtime->status->state = SNDRV_PCM_STATE_OPEN; 917 918 substream->runtime = runtime; 919 substream->private_data = pcm->private_data; 920 substream->ref_count = 1; 921 substream->f_flags = file->f_flags; 922 substream->pid = get_pid(task_pid(current)); 923 pstr->substream_opened++; 924 *rsubstream = substream; 925 return 0; 926 } 927 928 void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 929 { 930 struct snd_pcm_runtime *runtime; 931 932 if (PCM_RUNTIME_CHECK(substream)) 933 return; 934 runtime = substream->runtime; 935 if (runtime->private_free != NULL) 936 runtime->private_free(runtime); 937 snd_free_pages((void*)runtime->status, 938 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 939 snd_free_pages((void*)runtime->control, 940 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 941 kfree(runtime->hw_constraints.rules); 942 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 943 if (runtime->hwptr_log) 944 kfree(runtime->hwptr_log); 945 #endif 946 kfree(runtime); 947 substream->runtime = NULL; 948 put_pid(substream->pid); 949 substream->pid = NULL; 950 substream->pstr->substream_opened--; 951 } 952 953 static ssize_t show_pcm_class(struct device *dev, 954 struct device_attribute *attr, char *buf) 955 { 956 struct snd_pcm *pcm; 957 const char *str; 958 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 959 [SNDRV_PCM_CLASS_GENERIC] = "generic", 960 [SNDRV_PCM_CLASS_MULTI] = "multi", 961 [SNDRV_PCM_CLASS_MODEM] = "modem", 962 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 963 }; 964 965 if (! (pcm = dev_get_drvdata(dev)) || 966 pcm->dev_class > SNDRV_PCM_CLASS_LAST) 967 str = "none"; 968 else 969 str = strs[pcm->dev_class]; 970 return snprintf(buf, PAGE_SIZE, "%s\n", str); 971 } 972 973 static struct device_attribute pcm_attrs = 974 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); 975 976 static int snd_pcm_dev_register(struct snd_device *device) 977 { 978 int cidx, err; 979 struct snd_pcm_substream *substream; 980 struct snd_pcm_notify *notify; 981 char str[16]; 982 struct snd_pcm *pcm; 983 struct device *dev; 984 985 if (snd_BUG_ON(!device || !device->device_data)) 986 return -ENXIO; 987 pcm = device->device_data; 988 mutex_lock(®ister_mutex); 989 err = snd_pcm_add(pcm); 990 if (err) { 991 mutex_unlock(®ister_mutex); 992 return err; 993 } 994 for (cidx = 0; cidx < 2; cidx++) { 995 int devtype = -1; 996 if (pcm->streams[cidx].substream == NULL) 997 continue; 998 switch (cidx) { 999 case SNDRV_PCM_STREAM_PLAYBACK: 1000 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 1001 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1002 break; 1003 case SNDRV_PCM_STREAM_CAPTURE: 1004 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 1005 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1006 break; 1007 } 1008 /* device pointer to use, pcm->dev takes precedence if 1009 * it is assigned, otherwise fall back to card's device 1010 * if possible */ 1011 dev = pcm->dev; 1012 if (!dev) 1013 dev = snd_card_get_device_link(pcm->card); 1014 /* register pcm */ 1015 err = snd_register_device_for_dev(devtype, pcm->card, 1016 pcm->device, 1017 &snd_pcm_f_ops[cidx], 1018 pcm, str, dev); 1019 if (err < 0) { 1020 list_del(&pcm->list); 1021 mutex_unlock(®ister_mutex); 1022 return err; 1023 } 1024 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device, 1025 &pcm_attrs); 1026 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1027 snd_pcm_timer_init(substream); 1028 } 1029 1030 list_for_each_entry(notify, &snd_pcm_notify_list, list) 1031 notify->n_register(pcm); 1032 1033 mutex_unlock(®ister_mutex); 1034 return 0; 1035 } 1036 1037 static int snd_pcm_dev_disconnect(struct snd_device *device) 1038 { 1039 struct snd_pcm *pcm = device->device_data; 1040 struct snd_pcm_notify *notify; 1041 struct snd_pcm_substream *substream; 1042 int cidx, devtype; 1043 1044 mutex_lock(®ister_mutex); 1045 if (list_empty(&pcm->list)) 1046 goto unlock; 1047 1048 list_del_init(&pcm->list); 1049 for (cidx = 0; cidx < 2; cidx++) 1050 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1051 if (substream->runtime) 1052 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1053 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 1054 notify->n_disconnect(pcm); 1055 } 1056 for (cidx = 0; cidx < 2; cidx++) { 1057 devtype = -1; 1058 switch (cidx) { 1059 case SNDRV_PCM_STREAM_PLAYBACK: 1060 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1061 break; 1062 case SNDRV_PCM_STREAM_CAPTURE: 1063 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1064 break; 1065 } 1066 snd_unregister_device(devtype, pcm->card, pcm->device); 1067 } 1068 unlock: 1069 mutex_unlock(®ister_mutex); 1070 return 0; 1071 } 1072 1073 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1074 { 1075 struct snd_pcm *pcm; 1076 1077 if (snd_BUG_ON(!notify || 1078 !notify->n_register || 1079 !notify->n_unregister || 1080 !notify->n_disconnect)) 1081 return -EINVAL; 1082 mutex_lock(®ister_mutex); 1083 if (nfree) { 1084 list_del(¬ify->list); 1085 list_for_each_entry(pcm, &snd_pcm_devices, list) 1086 notify->n_unregister(pcm); 1087 } else { 1088 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1089 list_for_each_entry(pcm, &snd_pcm_devices, list) 1090 notify->n_register(pcm); 1091 } 1092 mutex_unlock(®ister_mutex); 1093 return 0; 1094 } 1095 1096 EXPORT_SYMBOL(snd_pcm_notify); 1097 1098 #ifdef CONFIG_PROC_FS 1099 /* 1100 * Info interface 1101 */ 1102 1103 static void snd_pcm_proc_read(struct snd_info_entry *entry, 1104 struct snd_info_buffer *buffer) 1105 { 1106 struct snd_pcm *pcm; 1107 1108 mutex_lock(®ister_mutex); 1109 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1110 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1111 pcm->card->number, pcm->device, pcm->id, pcm->name); 1112 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1113 snd_iprintf(buffer, " : playback %i", 1114 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1115 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1116 snd_iprintf(buffer, " : capture %i", 1117 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1118 snd_iprintf(buffer, "\n"); 1119 } 1120 mutex_unlock(®ister_mutex); 1121 } 1122 1123 static struct snd_info_entry *snd_pcm_proc_entry; 1124 1125 static void snd_pcm_proc_init(void) 1126 { 1127 struct snd_info_entry *entry; 1128 1129 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1130 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1131 if (snd_info_register(entry) < 0) { 1132 snd_info_free_entry(entry); 1133 entry = NULL; 1134 } 1135 } 1136 snd_pcm_proc_entry = entry; 1137 } 1138 1139 static void snd_pcm_proc_done(void) 1140 { 1141 snd_info_free_entry(snd_pcm_proc_entry); 1142 } 1143 1144 #else /* !CONFIG_PROC_FS */ 1145 #define snd_pcm_proc_init() 1146 #define snd_pcm_proc_done() 1147 #endif /* CONFIG_PROC_FS */ 1148 1149 1150 /* 1151 * ENTRY functions 1152 */ 1153 1154 static int __init alsa_pcm_init(void) 1155 { 1156 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1157 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1158 snd_pcm_proc_init(); 1159 return 0; 1160 } 1161 1162 static void __exit alsa_pcm_exit(void) 1163 { 1164 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1165 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1166 snd_pcm_proc_done(); 1167 } 1168 1169 module_init(alsa_pcm_init) 1170 module_exit(alsa_pcm_exit) 1171