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