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 (format >= ARRAY_SIZE(snd_pcm_format_names)) 215 return "Unknown"; 216 return snd_pcm_format_names[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[access]; 273 } 274 275 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 276 { 277 return snd_pcm_subformat_names[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[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((struct snd_pcm_substream *)entry->private_data, 368 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 = substream->runtime; 376 if (!runtime) { 377 snd_iprintf(buffer, "closed\n"); 378 return; 379 } 380 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 381 snd_iprintf(buffer, "no setup\n"); 382 return; 383 } 384 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 385 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 386 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 387 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 388 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 389 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 390 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 391 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 392 if (substream->oss.oss) { 393 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 394 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 395 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 396 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 397 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 398 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 399 } 400 #endif 401 } 402 403 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 404 struct snd_info_buffer *buffer) 405 { 406 struct snd_pcm_substream *substream = entry->private_data; 407 struct snd_pcm_runtime *runtime = substream->runtime; 408 if (!runtime) { 409 snd_iprintf(buffer, "closed\n"); 410 return; 411 } 412 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 413 snd_iprintf(buffer, "no setup\n"); 414 return; 415 } 416 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 417 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 418 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 419 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 420 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 421 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 422 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 423 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 424 } 425 426 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 427 struct snd_info_buffer *buffer) 428 { 429 struct snd_pcm_substream *substream = entry->private_data; 430 struct snd_pcm_runtime *runtime = substream->runtime; 431 struct snd_pcm_status status; 432 int err; 433 if (!runtime) { 434 snd_iprintf(buffer, "closed\n"); 435 return; 436 } 437 memset(&status, 0, sizeof(status)); 438 err = snd_pcm_status(substream, &status); 439 if (err < 0) { 440 snd_iprintf(buffer, "error %d\n", err); 441 return; 442 } 443 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 444 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); 445 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 446 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 447 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 448 status.tstamp.tv_sec, status.tstamp.tv_nsec); 449 snd_iprintf(buffer, "delay : %ld\n", status.delay); 450 snd_iprintf(buffer, "avail : %ld\n", status.avail); 451 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 452 snd_iprintf(buffer, "-----\n"); 453 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 454 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 455 } 456 457 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 458 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 459 struct snd_info_buffer *buffer) 460 { 461 struct snd_pcm_str *pstr = entry->private_data; 462 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 463 } 464 465 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 466 struct snd_info_buffer *buffer) 467 { 468 struct snd_pcm_str *pstr = entry->private_data; 469 char line[64]; 470 if (!snd_info_get_line(buffer, line, sizeof(line))) 471 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 472 } 473 #endif 474 475 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 476 { 477 struct snd_pcm *pcm = pstr->pcm; 478 struct snd_info_entry *entry; 479 char name[16]; 480 481 sprintf(name, "pcm%i%c", pcm->device, 482 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 483 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 484 return -ENOMEM; 485 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 486 if (snd_info_register(entry) < 0) { 487 snd_info_free_entry(entry); 488 return -ENOMEM; 489 } 490 pstr->proc_root = entry; 491 492 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 493 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read); 494 if (snd_info_register(entry) < 0) { 495 snd_info_free_entry(entry); 496 entry = NULL; 497 } 498 } 499 pstr->proc_info_entry = entry; 500 501 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 502 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 503 pstr->proc_root)) != NULL) { 504 entry->c.text.read = snd_pcm_xrun_debug_read; 505 entry->c.text.write = snd_pcm_xrun_debug_write; 506 entry->mode |= S_IWUSR; 507 entry->private_data = pstr; 508 if (snd_info_register(entry) < 0) { 509 snd_info_free_entry(entry); 510 entry = NULL; 511 } 512 } 513 pstr->proc_xrun_debug_entry = entry; 514 #endif 515 return 0; 516 } 517 518 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 519 { 520 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 521 snd_info_free_entry(pstr->proc_xrun_debug_entry); 522 pstr->proc_xrun_debug_entry = NULL; 523 #endif 524 snd_info_free_entry(pstr->proc_info_entry); 525 pstr->proc_info_entry = NULL; 526 snd_info_free_entry(pstr->proc_root); 527 pstr->proc_root = NULL; 528 return 0; 529 } 530 531 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 532 { 533 struct snd_info_entry *entry; 534 struct snd_card *card; 535 char name[16]; 536 537 card = substream->pcm->card; 538 539 sprintf(name, "sub%i", substream->number); 540 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 541 return -ENOMEM; 542 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 543 if (snd_info_register(entry) < 0) { 544 snd_info_free_entry(entry); 545 return -ENOMEM; 546 } 547 substream->proc_root = entry; 548 549 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 550 snd_info_set_text_ops(entry, substream, 551 snd_pcm_substream_proc_info_read); 552 if (snd_info_register(entry) < 0) { 553 snd_info_free_entry(entry); 554 entry = NULL; 555 } 556 } 557 substream->proc_info_entry = entry; 558 559 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 560 snd_info_set_text_ops(entry, substream, 561 snd_pcm_substream_proc_hw_params_read); 562 if (snd_info_register(entry) < 0) { 563 snd_info_free_entry(entry); 564 entry = NULL; 565 } 566 } 567 substream->proc_hw_params_entry = entry; 568 569 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 570 snd_info_set_text_ops(entry, substream, 571 snd_pcm_substream_proc_sw_params_read); 572 if (snd_info_register(entry) < 0) { 573 snd_info_free_entry(entry); 574 entry = NULL; 575 } 576 } 577 substream->proc_sw_params_entry = entry; 578 579 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 580 snd_info_set_text_ops(entry, substream, 581 snd_pcm_substream_proc_status_read); 582 if (snd_info_register(entry) < 0) { 583 snd_info_free_entry(entry); 584 entry = NULL; 585 } 586 } 587 substream->proc_status_entry = entry; 588 589 return 0; 590 } 591 592 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 593 { 594 snd_info_free_entry(substream->proc_info_entry); 595 substream->proc_info_entry = NULL; 596 snd_info_free_entry(substream->proc_hw_params_entry); 597 substream->proc_hw_params_entry = NULL; 598 snd_info_free_entry(substream->proc_sw_params_entry); 599 substream->proc_sw_params_entry = NULL; 600 snd_info_free_entry(substream->proc_status_entry); 601 substream->proc_status_entry = NULL; 602 snd_info_free_entry(substream->proc_root); 603 substream->proc_root = NULL; 604 return 0; 605 } 606 #else /* !CONFIG_SND_VERBOSE_PROCFS */ 607 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 608 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 609 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 610 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 611 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 612 613 /** 614 * snd_pcm_new_stream - create a new PCM stream 615 * @pcm: the pcm instance 616 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 617 * @substream_count: the number of substreams 618 * 619 * Creates a new stream for the pcm. 620 * The corresponding stream on the pcm must have been empty before 621 * calling this, i.e. zero must be given to the argument of 622 * snd_pcm_new(). 623 * 624 * Returns zero if successful, or a negative error code on failure. 625 */ 626 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 627 { 628 int idx, err; 629 struct snd_pcm_str *pstr = &pcm->streams[stream]; 630 struct snd_pcm_substream *substream, *prev; 631 632 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 633 mutex_init(&pstr->oss.setup_mutex); 634 #endif 635 pstr->stream = stream; 636 pstr->pcm = pcm; 637 pstr->substream_count = substream_count; 638 if (substream_count > 0) { 639 err = snd_pcm_stream_proc_init(pstr); 640 if (err < 0) { 641 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 642 return err; 643 } 644 } 645 prev = NULL; 646 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 647 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 648 if (substream == NULL) { 649 snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); 650 return -ENOMEM; 651 } 652 substream->pcm = pcm; 653 substream->pstr = pstr; 654 substream->number = idx; 655 substream->stream = stream; 656 sprintf(substream->name, "subdevice #%i", idx); 657 substream->buffer_bytes_max = UINT_MAX; 658 if (prev == NULL) 659 pstr->substream = substream; 660 else 661 prev->next = substream; 662 err = snd_pcm_substream_proc_init(substream); 663 if (err < 0) { 664 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 665 if (prev == NULL) 666 pstr->substream = NULL; 667 else 668 prev->next = NULL; 669 kfree(substream); 670 return err; 671 } 672 substream->group = &substream->self_group; 673 spin_lock_init(&substream->self_group.lock); 674 INIT_LIST_HEAD(&substream->self_group.substreams); 675 list_add_tail(&substream->link_list, &substream->self_group.substreams); 676 atomic_set(&substream->mmap_count, 0); 677 prev = substream; 678 } 679 return 0; 680 } 681 682 EXPORT_SYMBOL(snd_pcm_new_stream); 683 684 /** 685 * snd_pcm_new - create a new PCM instance 686 * @card: the card instance 687 * @id: the id string 688 * @device: the device index (zero based) 689 * @playback_count: the number of substreams for playback 690 * @capture_count: the number of substreams for capture 691 * @rpcm: the pointer to store the new pcm instance 692 * 693 * Creates a new PCM instance. 694 * 695 * The pcm operators have to be set afterwards to the new instance 696 * via snd_pcm_set_ops(). 697 * 698 * Returns zero if successful, or a negative error code on failure. 699 */ 700 int snd_pcm_new(struct snd_card *card, const char *id, int device, 701 int playback_count, int capture_count, 702 struct snd_pcm ** rpcm) 703 { 704 struct snd_pcm *pcm; 705 int err; 706 static struct snd_device_ops ops = { 707 .dev_free = snd_pcm_dev_free, 708 .dev_register = snd_pcm_dev_register, 709 .dev_disconnect = snd_pcm_dev_disconnect, 710 }; 711 712 if (snd_BUG_ON(!card)) 713 return -ENXIO; 714 if (rpcm) 715 *rpcm = NULL; 716 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 717 if (pcm == NULL) { 718 snd_printk(KERN_ERR "Cannot allocate PCM\n"); 719 return -ENOMEM; 720 } 721 pcm->card = card; 722 pcm->device = device; 723 if (id) 724 strlcpy(pcm->id, id, sizeof(pcm->id)); 725 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 726 snd_pcm_free(pcm); 727 return err; 728 } 729 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 730 snd_pcm_free(pcm); 731 return err; 732 } 733 mutex_init(&pcm->open_mutex); 734 init_waitqueue_head(&pcm->open_wait); 735 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 736 snd_pcm_free(pcm); 737 return err; 738 } 739 if (rpcm) 740 *rpcm = pcm; 741 return 0; 742 } 743 744 EXPORT_SYMBOL(snd_pcm_new); 745 746 static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 747 { 748 struct snd_pcm_substream *substream, *substream_next; 749 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 750 struct snd_pcm_oss_setup *setup, *setupn; 751 #endif 752 substream = pstr->substream; 753 while (substream) { 754 substream_next = substream->next; 755 snd_pcm_timer_done(substream); 756 snd_pcm_substream_proc_done(substream); 757 kfree(substream); 758 substream = substream_next; 759 } 760 snd_pcm_stream_proc_done(pstr); 761 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 762 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 763 setupn = setup->next; 764 kfree(setup->task_name); 765 kfree(setup); 766 } 767 #endif 768 } 769 770 static int snd_pcm_free(struct snd_pcm *pcm) 771 { 772 struct snd_pcm_notify *notify; 773 774 if (!pcm) 775 return 0; 776 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 777 notify->n_unregister(pcm); 778 } 779 if (pcm->private_free) 780 pcm->private_free(pcm); 781 snd_pcm_lib_preallocate_free_for_all(pcm); 782 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 783 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 784 kfree(pcm); 785 return 0; 786 } 787 788 static int snd_pcm_dev_free(struct snd_device *device) 789 { 790 struct snd_pcm *pcm = device->device_data; 791 return snd_pcm_free(pcm); 792 } 793 794 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, 795 struct file *file, 796 struct snd_pcm_substream **rsubstream) 797 { 798 struct snd_pcm_str * pstr; 799 struct snd_pcm_substream *substream; 800 struct snd_pcm_runtime *runtime; 801 struct snd_ctl_file *kctl; 802 struct snd_card *card; 803 int prefer_subdevice = -1; 804 size_t size; 805 806 if (snd_BUG_ON(!pcm || !rsubstream)) 807 return -ENXIO; 808 *rsubstream = NULL; 809 pstr = &pcm->streams[stream]; 810 if (pstr->substream == NULL || pstr->substream_count == 0) 811 return -ENODEV; 812 813 card = pcm->card; 814 read_lock(&card->ctl_files_rwlock); 815 list_for_each_entry(kctl, &card->ctl_files, list) { 816 if (kctl->pid == task_pid(current)) { 817 prefer_subdevice = kctl->prefer_pcm_subdevice; 818 if (prefer_subdevice != -1) 819 break; 820 } 821 } 822 read_unlock(&card->ctl_files_rwlock); 823 824 switch (stream) { 825 case SNDRV_PCM_STREAM_PLAYBACK: 826 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 827 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 828 if (SUBSTREAM_BUSY(substream)) 829 return -EAGAIN; 830 } 831 } 832 break; 833 case SNDRV_PCM_STREAM_CAPTURE: 834 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 835 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 836 if (SUBSTREAM_BUSY(substream)) 837 return -EAGAIN; 838 } 839 } 840 break; 841 default: 842 return -EINVAL; 843 } 844 845 if (file->f_flags & O_APPEND) { 846 if (prefer_subdevice < 0) { 847 if (pstr->substream_count > 1) 848 return -EINVAL; /* must be unique */ 849 substream = pstr->substream; 850 } else { 851 for (substream = pstr->substream; substream; 852 substream = substream->next) 853 if (substream->number == prefer_subdevice) 854 break; 855 } 856 if (! substream) 857 return -ENODEV; 858 if (! SUBSTREAM_BUSY(substream)) 859 return -EBADFD; 860 substream->ref_count++; 861 *rsubstream = substream; 862 return 0; 863 } 864 865 if (prefer_subdevice >= 0) { 866 for (substream = pstr->substream; substream; substream = substream->next) 867 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 868 goto __ok; 869 } 870 for (substream = pstr->substream; substream; substream = substream->next) 871 if (!SUBSTREAM_BUSY(substream)) 872 break; 873 __ok: 874 if (substream == NULL) 875 return -EAGAIN; 876 877 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 878 if (runtime == NULL) 879 return -ENOMEM; 880 881 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 882 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 883 if (runtime->status == NULL) { 884 kfree(runtime); 885 return -ENOMEM; 886 } 887 memset((void*)runtime->status, 0, size); 888 889 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 890 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 891 if (runtime->control == NULL) { 892 snd_free_pages((void*)runtime->status, 893 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 894 kfree(runtime); 895 return -ENOMEM; 896 } 897 memset((void*)runtime->control, 0, size); 898 899 init_waitqueue_head(&runtime->sleep); 900 init_waitqueue_head(&runtime->tsleep); 901 902 runtime->status->state = SNDRV_PCM_STATE_OPEN; 903 904 substream->runtime = runtime; 905 substream->private_data = pcm->private_data; 906 substream->ref_count = 1; 907 substream->f_flags = file->f_flags; 908 substream->pid = get_pid(task_pid(current)); 909 pstr->substream_opened++; 910 *rsubstream = substream; 911 return 0; 912 } 913 914 void snd_pcm_detach_substream(struct snd_pcm_substream *substream) 915 { 916 struct snd_pcm_runtime *runtime; 917 918 if (PCM_RUNTIME_CHECK(substream)) 919 return; 920 runtime = substream->runtime; 921 if (runtime->private_free != NULL) 922 runtime->private_free(runtime); 923 snd_free_pages((void*)runtime->status, 924 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 925 snd_free_pages((void*)runtime->control, 926 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 927 kfree(runtime->hw_constraints.rules); 928 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 929 if (runtime->hwptr_log) 930 kfree(runtime->hwptr_log); 931 #endif 932 kfree(runtime); 933 substream->runtime = NULL; 934 put_pid(substream->pid); 935 substream->pid = NULL; 936 substream->pstr->substream_opened--; 937 } 938 939 static ssize_t show_pcm_class(struct device *dev, 940 struct device_attribute *attr, char *buf) 941 { 942 struct snd_pcm *pcm; 943 const char *str; 944 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = { 945 [SNDRV_PCM_CLASS_GENERIC] = "generic", 946 [SNDRV_PCM_CLASS_MULTI] = "multi", 947 [SNDRV_PCM_CLASS_MODEM] = "modem", 948 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer", 949 }; 950 951 if (! (pcm = dev_get_drvdata(dev)) || 952 pcm->dev_class > SNDRV_PCM_CLASS_LAST) 953 str = "none"; 954 else 955 str = strs[pcm->dev_class]; 956 return snprintf(buf, PAGE_SIZE, "%s\n", str); 957 } 958 959 static struct device_attribute pcm_attrs = 960 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL); 961 962 static int snd_pcm_dev_register(struct snd_device *device) 963 { 964 int cidx, err; 965 struct snd_pcm_substream *substream; 966 struct snd_pcm_notify *notify; 967 char str[16]; 968 struct snd_pcm *pcm; 969 struct device *dev; 970 971 if (snd_BUG_ON(!device || !device->device_data)) 972 return -ENXIO; 973 pcm = device->device_data; 974 mutex_lock(®ister_mutex); 975 err = snd_pcm_add(pcm); 976 if (err) { 977 mutex_unlock(®ister_mutex); 978 return err; 979 } 980 for (cidx = 0; cidx < 2; cidx++) { 981 int devtype = -1; 982 if (pcm->streams[cidx].substream == NULL) 983 continue; 984 switch (cidx) { 985 case SNDRV_PCM_STREAM_PLAYBACK: 986 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 987 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 988 break; 989 case SNDRV_PCM_STREAM_CAPTURE: 990 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 991 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 992 break; 993 } 994 /* device pointer to use, pcm->dev takes precedence if 995 * it is assigned, otherwise fall back to card's device 996 * if possible */ 997 dev = pcm->dev; 998 if (!dev) 999 dev = snd_card_get_device_link(pcm->card); 1000 /* register pcm */ 1001 err = snd_register_device_for_dev(devtype, pcm->card, 1002 pcm->device, 1003 &snd_pcm_f_ops[cidx], 1004 pcm, str, dev); 1005 if (err < 0) { 1006 list_del(&pcm->list); 1007 mutex_unlock(®ister_mutex); 1008 return err; 1009 } 1010 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device, 1011 &pcm_attrs); 1012 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1013 snd_pcm_timer_init(substream); 1014 } 1015 1016 list_for_each_entry(notify, &snd_pcm_notify_list, list) 1017 notify->n_register(pcm); 1018 1019 mutex_unlock(®ister_mutex); 1020 return 0; 1021 } 1022 1023 static int snd_pcm_dev_disconnect(struct snd_device *device) 1024 { 1025 struct snd_pcm *pcm = device->device_data; 1026 struct snd_pcm_notify *notify; 1027 struct snd_pcm_substream *substream; 1028 int cidx, devtype; 1029 1030 mutex_lock(®ister_mutex); 1031 if (list_empty(&pcm->list)) 1032 goto unlock; 1033 1034 list_del_init(&pcm->list); 1035 for (cidx = 0; cidx < 2; cidx++) 1036 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 1037 if (substream->runtime) 1038 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 1039 list_for_each_entry(notify, &snd_pcm_notify_list, list) { 1040 notify->n_disconnect(pcm); 1041 } 1042 for (cidx = 0; cidx < 2; cidx++) { 1043 devtype = -1; 1044 switch (cidx) { 1045 case SNDRV_PCM_STREAM_PLAYBACK: 1046 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 1047 break; 1048 case SNDRV_PCM_STREAM_CAPTURE: 1049 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 1050 break; 1051 } 1052 snd_unregister_device(devtype, pcm->card, pcm->device); 1053 } 1054 unlock: 1055 mutex_unlock(®ister_mutex); 1056 return 0; 1057 } 1058 1059 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1060 { 1061 struct snd_pcm *pcm; 1062 1063 if (snd_BUG_ON(!notify || 1064 !notify->n_register || 1065 !notify->n_unregister || 1066 !notify->n_disconnect)) 1067 return -EINVAL; 1068 mutex_lock(®ister_mutex); 1069 if (nfree) { 1070 list_del(¬ify->list); 1071 list_for_each_entry(pcm, &snd_pcm_devices, list) 1072 notify->n_unregister(pcm); 1073 } else { 1074 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1075 list_for_each_entry(pcm, &snd_pcm_devices, list) 1076 notify->n_register(pcm); 1077 } 1078 mutex_unlock(®ister_mutex); 1079 return 0; 1080 } 1081 1082 EXPORT_SYMBOL(snd_pcm_notify); 1083 1084 #ifdef CONFIG_PROC_FS 1085 /* 1086 * Info interface 1087 */ 1088 1089 static void snd_pcm_proc_read(struct snd_info_entry *entry, 1090 struct snd_info_buffer *buffer) 1091 { 1092 struct snd_pcm *pcm; 1093 1094 mutex_lock(®ister_mutex); 1095 list_for_each_entry(pcm, &snd_pcm_devices, list) { 1096 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1097 pcm->card->number, pcm->device, pcm->id, pcm->name); 1098 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1099 snd_iprintf(buffer, " : playback %i", 1100 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1101 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1102 snd_iprintf(buffer, " : capture %i", 1103 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1104 snd_iprintf(buffer, "\n"); 1105 } 1106 mutex_unlock(®ister_mutex); 1107 } 1108 1109 static struct snd_info_entry *snd_pcm_proc_entry; 1110 1111 static void snd_pcm_proc_init(void) 1112 { 1113 struct snd_info_entry *entry; 1114 1115 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1116 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read); 1117 if (snd_info_register(entry) < 0) { 1118 snd_info_free_entry(entry); 1119 entry = NULL; 1120 } 1121 } 1122 snd_pcm_proc_entry = entry; 1123 } 1124 1125 static void snd_pcm_proc_done(void) 1126 { 1127 snd_info_free_entry(snd_pcm_proc_entry); 1128 } 1129 1130 #else /* !CONFIG_PROC_FS */ 1131 #define snd_pcm_proc_init() 1132 #define snd_pcm_proc_done() 1133 #endif /* CONFIG_PROC_FS */ 1134 1135 1136 /* 1137 * ENTRY functions 1138 */ 1139 1140 static int __init alsa_pcm_init(void) 1141 { 1142 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1143 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1144 snd_pcm_proc_init(); 1145 return 0; 1146 } 1147 1148 static void __exit alsa_pcm_exit(void) 1149 { 1150 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1151 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1152 snd_pcm_proc_done(); 1153 } 1154 1155 module_init(alsa_pcm_init) 1156 module_exit(alsa_pcm_exit) 1157