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