1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <sound/core.h> 28 #include <sound/minors.h> 29 #include <sound/pcm.h> 30 #include <sound/control.h> 31 #include <sound/info.h> 32 33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>"); 34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA."); 35 MODULE_LICENSE("GPL"); 36 37 static LIST_HEAD(snd_pcm_devices); 38 static LIST_HEAD(snd_pcm_notify_list); 39 static DEFINE_MUTEX(register_mutex); 40 41 static int snd_pcm_free(struct snd_pcm *pcm); 42 static int snd_pcm_dev_free(struct snd_device *device); 43 static int snd_pcm_dev_register(struct snd_device *device); 44 static int snd_pcm_dev_disconnect(struct snd_device *device); 45 static int snd_pcm_dev_unregister(struct snd_device *device); 46 47 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device) 48 { 49 struct list_head *p; 50 struct snd_pcm *pcm; 51 52 list_for_each(p, &snd_pcm_devices) { 53 pcm = list_entry(p, struct snd_pcm, list); 54 if (pcm->card == card && pcm->device == device) 55 return pcm; 56 } 57 return NULL; 58 } 59 60 static int snd_pcm_control_ioctl(struct snd_card *card, 61 struct snd_ctl_file *control, 62 unsigned int cmd, unsigned long arg) 63 { 64 switch (cmd) { 65 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: 66 { 67 int device; 68 69 if (get_user(device, (int __user *)arg)) 70 return -EFAULT; 71 mutex_lock(®ister_mutex); 72 device = device < 0 ? 0 : device + 1; 73 while (device < SNDRV_PCM_DEVICES) { 74 if (snd_pcm_search(card, device)) 75 break; 76 device++; 77 } 78 if (device == SNDRV_PCM_DEVICES) 79 device = -1; 80 mutex_unlock(®ister_mutex); 81 if (put_user(device, (int __user *)arg)) 82 return -EFAULT; 83 return 0; 84 } 85 case SNDRV_CTL_IOCTL_PCM_INFO: 86 { 87 struct snd_pcm_info __user *info; 88 unsigned int device, subdevice; 89 int stream; 90 struct snd_pcm *pcm; 91 struct snd_pcm_str *pstr; 92 struct snd_pcm_substream *substream; 93 int err; 94 95 info = (struct snd_pcm_info __user *)arg; 96 if (get_user(device, &info->device)) 97 return -EFAULT; 98 if (get_user(stream, &info->stream)) 99 return -EFAULT; 100 if (stream < 0 || stream > 1) 101 return -EINVAL; 102 if (get_user(subdevice, &info->subdevice)) 103 return -EFAULT; 104 mutex_lock(®ister_mutex); 105 pcm = snd_pcm_search(card, device); 106 if (pcm == NULL) { 107 err = -ENXIO; 108 goto _error; 109 } 110 pstr = &pcm->streams[stream]; 111 if (pstr->substream_count == 0) { 112 err = -ENOENT; 113 goto _error; 114 } 115 if (subdevice >= pstr->substream_count) { 116 err = -ENXIO; 117 goto _error; 118 } 119 for (substream = pstr->substream; substream; 120 substream = substream->next) 121 if (substream->number == (int)subdevice) 122 break; 123 if (substream == NULL) { 124 err = -ENXIO; 125 goto _error; 126 } 127 err = snd_pcm_info_user(substream, info); 128 _error: 129 mutex_unlock(®ister_mutex); 130 return err; 131 } 132 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: 133 { 134 int val; 135 136 if (get_user(val, (int __user *)arg)) 137 return -EFAULT; 138 control->prefer_pcm_subdevice = val; 139 return 0; 140 } 141 } 142 return -ENOIOCTLCMD; 143 } 144 145 #if defined(CONFIG_PROC_FS) && defined(CONFIG_SND_VERBOSE_PROCFS) 146 147 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v 148 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v 149 #define READY(v) [SNDRV_PCM_READY_##v] = #v 150 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v 151 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v 152 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v 153 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v 154 #define START(v) [SNDRV_PCM_START_##v] = #v 155 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v 156 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v 157 158 static char *snd_pcm_format_names[] = { 159 FORMAT(S8), 160 FORMAT(U8), 161 FORMAT(S16_LE), 162 FORMAT(S16_BE), 163 FORMAT(U16_LE), 164 FORMAT(U16_BE), 165 FORMAT(S24_LE), 166 FORMAT(S24_BE), 167 FORMAT(U24_LE), 168 FORMAT(U24_BE), 169 FORMAT(S32_LE), 170 FORMAT(S32_BE), 171 FORMAT(U32_LE), 172 FORMAT(U32_BE), 173 FORMAT(FLOAT_LE), 174 FORMAT(FLOAT_BE), 175 FORMAT(FLOAT64_LE), 176 FORMAT(FLOAT64_BE), 177 FORMAT(IEC958_SUBFRAME_LE), 178 FORMAT(IEC958_SUBFRAME_BE), 179 FORMAT(MU_LAW), 180 FORMAT(A_LAW), 181 FORMAT(IMA_ADPCM), 182 FORMAT(MPEG), 183 FORMAT(GSM), 184 FORMAT(SPECIAL), 185 FORMAT(S24_3LE), 186 FORMAT(S24_3BE), 187 FORMAT(U24_3LE), 188 FORMAT(U24_3BE), 189 FORMAT(S20_3LE), 190 FORMAT(S20_3BE), 191 FORMAT(U20_3LE), 192 FORMAT(U20_3BE), 193 FORMAT(S18_3LE), 194 FORMAT(S18_3BE), 195 FORMAT(U18_3LE), 196 FORMAT(U18_3BE), 197 }; 198 199 const char *snd_pcm_format_name(snd_pcm_format_t format) 200 { 201 return snd_pcm_format_names[format]; 202 } 203 204 static char *snd_pcm_stream_names[] = { 205 STREAM(PLAYBACK), 206 STREAM(CAPTURE), 207 }; 208 209 static char *snd_pcm_state_names[] = { 210 STATE(OPEN), 211 STATE(SETUP), 212 STATE(PREPARED), 213 STATE(RUNNING), 214 STATE(XRUN), 215 STATE(DRAINING), 216 STATE(PAUSED), 217 STATE(SUSPENDED), 218 }; 219 220 static char *snd_pcm_access_names[] = { 221 ACCESS(MMAP_INTERLEAVED), 222 ACCESS(MMAP_NONINTERLEAVED), 223 ACCESS(MMAP_COMPLEX), 224 ACCESS(RW_INTERLEAVED), 225 ACCESS(RW_NONINTERLEAVED), 226 }; 227 228 static char *snd_pcm_subformat_names[] = { 229 SUBFORMAT(STD), 230 }; 231 232 static char *snd_pcm_tstamp_mode_names[] = { 233 TSTAMP(NONE), 234 TSTAMP(MMAP), 235 }; 236 237 static const char *snd_pcm_stream_name(int stream) 238 { 239 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL); 240 return snd_pcm_stream_names[stream]; 241 } 242 243 static const char *snd_pcm_access_name(snd_pcm_access_t access) 244 { 245 return snd_pcm_access_names[access]; 246 } 247 248 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat) 249 { 250 return snd_pcm_subformat_names[subformat]; 251 } 252 253 static const char *snd_pcm_tstamp_mode_name(int mode) 254 { 255 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL); 256 return snd_pcm_tstamp_mode_names[mode]; 257 } 258 259 static const char *snd_pcm_state_name(snd_pcm_state_t state) 260 { 261 return snd_pcm_state_names[state]; 262 } 263 264 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 265 #include <linux/soundcard.h> 266 267 static const char *snd_pcm_oss_format_name(int format) 268 { 269 switch (format) { 270 case AFMT_MU_LAW: 271 return "MU_LAW"; 272 case AFMT_A_LAW: 273 return "A_LAW"; 274 case AFMT_IMA_ADPCM: 275 return "IMA_ADPCM"; 276 case AFMT_U8: 277 return "U8"; 278 case AFMT_S16_LE: 279 return "S16_LE"; 280 case AFMT_S16_BE: 281 return "S16_BE"; 282 case AFMT_S8: 283 return "S8"; 284 case AFMT_U16_LE: 285 return "U16_LE"; 286 case AFMT_U16_BE: 287 return "U16_BE"; 288 case AFMT_MPEG: 289 return "MPEG"; 290 default: 291 return "unknown"; 292 } 293 } 294 #endif 295 296 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream, 297 struct snd_info_buffer *buffer) 298 { 299 struct snd_pcm_info *info; 300 int err; 301 302 if (! substream) 303 return; 304 305 info = kmalloc(sizeof(*info), GFP_KERNEL); 306 if (! info) { 307 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n"); 308 return; 309 } 310 311 err = snd_pcm_info(substream, info); 312 if (err < 0) { 313 snd_iprintf(buffer, "error %d\n", err); 314 kfree(info); 315 return; 316 } 317 snd_iprintf(buffer, "card: %d\n", info->card); 318 snd_iprintf(buffer, "device: %d\n", info->device); 319 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice); 320 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream)); 321 snd_iprintf(buffer, "id: %s\n", info->id); 322 snd_iprintf(buffer, "name: %s\n", info->name); 323 snd_iprintf(buffer, "subname: %s\n", info->subname); 324 snd_iprintf(buffer, "class: %d\n", info->dev_class); 325 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass); 326 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count); 327 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail); 328 kfree(info); 329 } 330 331 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry, 332 struct snd_info_buffer *buffer) 333 { 334 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream, 335 buffer); 336 } 337 338 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry, 339 struct snd_info_buffer *buffer) 340 { 341 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data, 342 buffer); 343 } 344 345 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry, 346 struct snd_info_buffer *buffer) 347 { 348 struct snd_pcm_substream *substream = entry->private_data; 349 struct snd_pcm_runtime *runtime = substream->runtime; 350 if (!runtime) { 351 snd_iprintf(buffer, "closed\n"); 352 return; 353 } 354 snd_pcm_stream_lock_irq(substream); 355 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 356 snd_iprintf(buffer, "no setup\n"); 357 snd_pcm_stream_unlock_irq(substream); 358 return; 359 } 360 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access)); 361 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format)); 362 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat)); 363 snd_iprintf(buffer, "channels: %u\n", runtime->channels); 364 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den); 365 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size); 366 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size); 367 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time); 368 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 369 if (substream->oss.oss) { 370 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format)); 371 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels); 372 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate); 373 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes); 374 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods); 375 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames); 376 } 377 #endif 378 snd_pcm_stream_unlock_irq(substream); 379 } 380 381 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry, 382 struct snd_info_buffer *buffer) 383 { 384 struct snd_pcm_substream *substream = entry->private_data; 385 struct snd_pcm_runtime *runtime = substream->runtime; 386 if (!runtime) { 387 snd_iprintf(buffer, "closed\n"); 388 return; 389 } 390 snd_pcm_stream_lock_irq(substream); 391 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 392 snd_iprintf(buffer, "no setup\n"); 393 snd_pcm_stream_unlock_irq(substream); 394 return; 395 } 396 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode)); 397 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step); 398 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min); 399 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min); 400 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align); 401 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold); 402 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold); 403 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold); 404 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size); 405 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary); 406 snd_pcm_stream_unlock_irq(substream); 407 } 408 409 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, 410 struct snd_info_buffer *buffer) 411 { 412 struct snd_pcm_substream *substream = entry->private_data; 413 struct snd_pcm_runtime *runtime = substream->runtime; 414 struct snd_pcm_status status; 415 int err; 416 if (!runtime) { 417 snd_iprintf(buffer, "closed\n"); 418 return; 419 } 420 memset(&status, 0, sizeof(status)); 421 err = snd_pcm_status(substream, &status); 422 if (err < 0) { 423 snd_iprintf(buffer, "error %d\n", err); 424 return; 425 } 426 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); 427 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", 428 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); 429 snd_iprintf(buffer, "tstamp : %ld.%09ld\n", 430 status.tstamp.tv_sec, status.tstamp.tv_nsec); 431 snd_iprintf(buffer, "delay : %ld\n", status.delay); 432 snd_iprintf(buffer, "avail : %ld\n", status.avail); 433 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); 434 snd_iprintf(buffer, "-----\n"); 435 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr); 436 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr); 437 } 438 439 #ifdef CONFIG_SND_DEBUG 440 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry, 441 struct snd_info_buffer *buffer) 442 { 443 struct snd_pcm_str *pstr = entry->private_data; 444 snd_iprintf(buffer, "%d\n", pstr->xrun_debug); 445 } 446 447 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry, 448 struct snd_info_buffer *buffer) 449 { 450 struct snd_pcm_str *pstr = entry->private_data; 451 char line[64]; 452 if (!snd_info_get_line(buffer, line, sizeof(line))) 453 pstr->xrun_debug = simple_strtoul(line, NULL, 10); 454 } 455 #endif 456 457 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) 458 { 459 struct snd_pcm *pcm = pstr->pcm; 460 struct snd_info_entry *entry; 461 char name[16]; 462 463 sprintf(name, "pcm%i%c", pcm->device, 464 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c'); 465 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL) 466 return -ENOMEM; 467 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 468 if (snd_info_register(entry) < 0) { 469 snd_info_free_entry(entry); 470 return -ENOMEM; 471 } 472 pstr->proc_root = entry; 473 474 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) { 475 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read); 476 if (snd_info_register(entry) < 0) { 477 snd_info_free_entry(entry); 478 entry = NULL; 479 } 480 } 481 pstr->proc_info_entry = entry; 482 483 #ifdef CONFIG_SND_DEBUG 484 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", 485 pstr->proc_root)) != NULL) { 486 entry->c.text.read_size = 64; 487 entry->c.text.read = snd_pcm_xrun_debug_read; 488 entry->c.text.write_size = 64; 489 entry->c.text.write = snd_pcm_xrun_debug_write; 490 entry->mode |= S_IWUSR; 491 entry->private_data = pstr; 492 if (snd_info_register(entry) < 0) { 493 snd_info_free_entry(entry); 494 entry = NULL; 495 } 496 } 497 pstr->proc_xrun_debug_entry = entry; 498 #endif 499 return 0; 500 } 501 502 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) 503 { 504 #ifdef CONFIG_SND_DEBUG 505 if (pstr->proc_xrun_debug_entry) { 506 snd_info_unregister(pstr->proc_xrun_debug_entry); 507 pstr->proc_xrun_debug_entry = NULL; 508 } 509 #endif 510 if (pstr->proc_info_entry) { 511 snd_info_unregister(pstr->proc_info_entry); 512 pstr->proc_info_entry = NULL; 513 } 514 if (pstr->proc_root) { 515 snd_info_unregister(pstr->proc_root); 516 pstr->proc_root = NULL; 517 } 518 return 0; 519 } 520 521 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) 522 { 523 struct snd_info_entry *entry; 524 struct snd_card *card; 525 char name[16]; 526 527 card = substream->pcm->card; 528 529 sprintf(name, "sub%i", substream->number); 530 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL) 531 return -ENOMEM; 532 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO; 533 if (snd_info_register(entry) < 0) { 534 snd_info_free_entry(entry); 535 return -ENOMEM; 536 } 537 substream->proc_root = entry; 538 539 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) { 540 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read); 541 if (snd_info_register(entry) < 0) { 542 snd_info_free_entry(entry); 543 entry = NULL; 544 } 545 } 546 substream->proc_info_entry = entry; 547 548 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) { 549 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read); 550 if (snd_info_register(entry) < 0) { 551 snd_info_free_entry(entry); 552 entry = NULL; 553 } 554 } 555 substream->proc_hw_params_entry = entry; 556 557 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) { 558 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read); 559 if (snd_info_register(entry) < 0) { 560 snd_info_free_entry(entry); 561 entry = NULL; 562 } 563 } 564 substream->proc_sw_params_entry = entry; 565 566 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) { 567 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read); 568 if (snd_info_register(entry) < 0) { 569 snd_info_free_entry(entry); 570 entry = NULL; 571 } 572 } 573 substream->proc_status_entry = entry; 574 575 return 0; 576 } 577 578 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) 579 { 580 if (substream->proc_info_entry) { 581 snd_info_unregister(substream->proc_info_entry); 582 substream->proc_info_entry = NULL; 583 } 584 if (substream->proc_hw_params_entry) { 585 snd_info_unregister(substream->proc_hw_params_entry); 586 substream->proc_hw_params_entry = NULL; 587 } 588 if (substream->proc_sw_params_entry) { 589 snd_info_unregister(substream->proc_sw_params_entry); 590 substream->proc_sw_params_entry = NULL; 591 } 592 if (substream->proc_status_entry) { 593 snd_info_unregister(substream->proc_status_entry); 594 substream->proc_status_entry = NULL; 595 } 596 if (substream->proc_root) { 597 snd_info_unregister(substream->proc_root); 598 substream->proc_root = NULL; 599 } 600 return 0; 601 } 602 #else /* !CONFIG_PROC_FS */ 603 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; } 604 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; } 605 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; } 606 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; } 607 #endif /* CONFIG_PROC_FS */ 608 609 /** 610 * snd_pcm_new_stream - create a new PCM stream 611 * @pcm: the pcm instance 612 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX 613 * @substream_count: the number of substreams 614 * 615 * Creates a new stream for the pcm. 616 * The corresponding stream on the pcm must have been empty before 617 * calling this, i.e. zero must be given to the argument of 618 * snd_pcm_new(). 619 * 620 * Returns zero if successful, or a negative error code on failure. 621 */ 622 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count) 623 { 624 int idx, err; 625 struct snd_pcm_str *pstr = &pcm->streams[stream]; 626 struct snd_pcm_substream *substream, *prev; 627 628 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 629 mutex_init(&pstr->oss.setup_mutex); 630 #endif 631 pstr->stream = stream; 632 pstr->pcm = pcm; 633 pstr->substream_count = substream_count; 634 if (substream_count > 0) { 635 err = snd_pcm_stream_proc_init(pstr); 636 if (err < 0) { 637 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n"); 638 return err; 639 } 640 } 641 prev = NULL; 642 for (idx = 0, prev = NULL; idx < substream_count; idx++) { 643 substream = kzalloc(sizeof(*substream), GFP_KERNEL); 644 if (substream == NULL) { 645 snd_printk(KERN_ERR "Cannot allocate PCM substream\n"); 646 return -ENOMEM; 647 } 648 substream->pcm = pcm; 649 substream->pstr = pstr; 650 substream->number = idx; 651 substream->stream = stream; 652 sprintf(substream->name, "subdevice #%i", 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 kfree(substream); 662 return err; 663 } 664 substream->group = &substream->self_group; 665 spin_lock_init(&substream->self_group.lock); 666 INIT_LIST_HEAD(&substream->self_group.substreams); 667 list_add_tail(&substream->link_list, &substream->self_group.substreams); 668 spin_lock_init(&substream->timer_lock); 669 prev = substream; 670 } 671 return 0; 672 } 673 674 /** 675 * snd_pcm_new - create a new PCM instance 676 * @card: the card instance 677 * @id: the id string 678 * @device: the device index (zero based) 679 * @playback_count: the number of substreams for playback 680 * @capture_count: the number of substreams for capture 681 * @rpcm: the pointer to store the new pcm instance 682 * 683 * Creates a new PCM instance. 684 * 685 * The pcm operators have to be set afterwards to the new instance 686 * via snd_pcm_set_ops(). 687 * 688 * Returns zero if successful, or a negative error code on failure. 689 */ 690 int snd_pcm_new(struct snd_card *card, char *id, int device, 691 int playback_count, int capture_count, 692 struct snd_pcm ** rpcm) 693 { 694 struct snd_pcm *pcm; 695 int err; 696 static struct snd_device_ops ops = { 697 .dev_free = snd_pcm_dev_free, 698 .dev_register = snd_pcm_dev_register, 699 .dev_disconnect = snd_pcm_dev_disconnect, 700 .dev_unregister = snd_pcm_dev_unregister 701 }; 702 703 snd_assert(rpcm != NULL, return -EINVAL); 704 *rpcm = NULL; 705 snd_assert(card != NULL, return -ENXIO); 706 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); 707 if (pcm == NULL) { 708 snd_printk(KERN_ERR "Cannot allocate PCM\n"); 709 return -ENOMEM; 710 } 711 pcm->card = card; 712 pcm->device = device; 713 if (id) 714 strlcpy(pcm->id, id, sizeof(pcm->id)); 715 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) { 716 snd_pcm_free(pcm); 717 return err; 718 } 719 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) { 720 snd_pcm_free(pcm); 721 return err; 722 } 723 mutex_init(&pcm->open_mutex); 724 init_waitqueue_head(&pcm->open_wait); 725 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) { 726 snd_pcm_free(pcm); 727 return err; 728 } 729 *rpcm = pcm; 730 return 0; 731 } 732 733 static void snd_pcm_free_stream(struct snd_pcm_str * pstr) 734 { 735 struct snd_pcm_substream *substream, *substream_next; 736 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 737 struct snd_pcm_oss_setup *setup, *setupn; 738 #endif 739 substream = pstr->substream; 740 while (substream) { 741 substream_next = substream->next; 742 snd_pcm_substream_proc_done(substream); 743 kfree(substream); 744 substream = substream_next; 745 } 746 snd_pcm_stream_proc_done(pstr); 747 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 748 for (setup = pstr->oss.setup_list; setup; setup = setupn) { 749 setupn = setup->next; 750 kfree(setup->task_name); 751 kfree(setup); 752 } 753 #endif 754 } 755 756 static int snd_pcm_free(struct snd_pcm *pcm) 757 { 758 snd_assert(pcm != NULL, return -ENXIO); 759 if (pcm->private_free) 760 pcm->private_free(pcm); 761 snd_pcm_lib_preallocate_free_for_all(pcm); 762 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]); 763 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]); 764 kfree(pcm); 765 return 0; 766 } 767 768 static int snd_pcm_dev_free(struct snd_device *device) 769 { 770 struct snd_pcm *pcm = device->device_data; 771 return snd_pcm_free(pcm); 772 } 773 774 static void snd_pcm_tick_timer_func(unsigned long data) 775 { 776 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data; 777 snd_pcm_tick_elapsed(substream); 778 } 779 780 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 781 struct snd_pcm_substream **rsubstream) 782 { 783 struct snd_pcm_str * pstr; 784 struct snd_pcm_substream *substream; 785 struct snd_pcm_runtime *runtime; 786 struct snd_ctl_file *kctl; 787 struct snd_card *card; 788 struct list_head *list; 789 int prefer_subdevice = -1; 790 size_t size; 791 792 snd_assert(rsubstream != NULL, return -EINVAL); 793 *rsubstream = NULL; 794 snd_assert(pcm != NULL, return -ENXIO); 795 pstr = &pcm->streams[stream]; 796 if (pstr->substream == NULL) 797 return -ENODEV; 798 799 card = pcm->card; 800 down_read(&card->controls_rwsem); 801 list_for_each(list, &card->ctl_files) { 802 kctl = snd_ctl_file(list); 803 if (kctl->pid == current->pid) { 804 prefer_subdevice = kctl->prefer_pcm_subdevice; 805 break; 806 } 807 } 808 up_read(&card->controls_rwsem); 809 810 if (pstr->substream_count == 0) 811 return -ENODEV; 812 switch (stream) { 813 case SNDRV_PCM_STREAM_PLAYBACK: 814 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 815 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) { 816 if (SUBSTREAM_BUSY(substream)) 817 return -EAGAIN; 818 } 819 } 820 break; 821 case SNDRV_PCM_STREAM_CAPTURE: 822 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) { 823 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) { 824 if (SUBSTREAM_BUSY(substream)) 825 return -EAGAIN; 826 } 827 } 828 break; 829 default: 830 return -EINVAL; 831 } 832 833 if (prefer_subdevice >= 0) { 834 for (substream = pstr->substream; substream; substream = substream->next) 835 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice) 836 goto __ok; 837 } 838 for (substream = pstr->substream; substream; substream = substream->next) 839 if (!SUBSTREAM_BUSY(substream)) 840 break; 841 __ok: 842 if (substream == NULL) 843 return -EAGAIN; 844 845 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); 846 if (runtime == NULL) 847 return -ENOMEM; 848 849 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)); 850 runtime->status = snd_malloc_pages(size, GFP_KERNEL); 851 if (runtime->status == NULL) { 852 kfree(runtime); 853 return -ENOMEM; 854 } 855 memset((void*)runtime->status, 0, size); 856 857 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)); 858 runtime->control = snd_malloc_pages(size, GFP_KERNEL); 859 if (runtime->control == NULL) { 860 snd_free_pages((void*)runtime->status, 861 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 862 kfree(runtime); 863 return -ENOMEM; 864 } 865 memset((void*)runtime->control, 0, size); 866 867 init_waitqueue_head(&runtime->sleep); 868 atomic_set(&runtime->mmap_count, 0); 869 init_timer(&runtime->tick_timer); 870 runtime->tick_timer.function = snd_pcm_tick_timer_func; 871 runtime->tick_timer.data = (unsigned long) substream; 872 873 runtime->status->state = SNDRV_PCM_STATE_OPEN; 874 875 substream->runtime = runtime; 876 substream->private_data = pcm->private_data; 877 pstr->substream_opened++; 878 *rsubstream = substream; 879 return 0; 880 } 881 882 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 883 { 884 struct snd_pcm_runtime *runtime; 885 substream->file = NULL; 886 runtime = substream->runtime; 887 snd_assert(runtime != NULL, return); 888 if (runtime->private_free != NULL) 889 runtime->private_free(runtime); 890 snd_free_pages((void*)runtime->status, 891 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))); 892 snd_free_pages((void*)runtime->control, 893 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))); 894 kfree(runtime->hw_constraints.rules); 895 kfree(runtime); 896 substream->runtime = NULL; 897 substream->pstr->substream_opened--; 898 } 899 900 static int snd_pcm_dev_register(struct snd_device *device) 901 { 902 int cidx, err; 903 struct snd_pcm_substream *substream; 904 struct list_head *list; 905 char str[16]; 906 struct snd_pcm *pcm = device->device_data; 907 908 snd_assert(pcm != NULL && device != NULL, return -ENXIO); 909 mutex_lock(®ister_mutex); 910 if (snd_pcm_search(pcm->card, pcm->device)) { 911 mutex_unlock(®ister_mutex); 912 return -EBUSY; 913 } 914 list_add_tail(&pcm->list, &snd_pcm_devices); 915 for (cidx = 0; cidx < 2; cidx++) { 916 int devtype = -1; 917 if (pcm->streams[cidx].substream == NULL) 918 continue; 919 switch (cidx) { 920 case SNDRV_PCM_STREAM_PLAYBACK: 921 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); 922 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 923 break; 924 case SNDRV_PCM_STREAM_CAPTURE: 925 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); 926 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 927 break; 928 } 929 if ((err = snd_register_device(devtype, pcm->card, 930 pcm->device, 931 &snd_pcm_f_ops[cidx], 932 pcm, str)) < 0) 933 { 934 list_del(&pcm->list); 935 mutex_unlock(®ister_mutex); 936 return err; 937 } 938 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 939 snd_pcm_timer_init(substream); 940 } 941 list_for_each(list, &snd_pcm_notify_list) { 942 struct snd_pcm_notify *notify; 943 notify = list_entry(list, struct snd_pcm_notify, list); 944 notify->n_register(pcm); 945 } 946 mutex_unlock(®ister_mutex); 947 return 0; 948 } 949 950 static int snd_pcm_dev_disconnect(struct snd_device *device) 951 { 952 struct snd_pcm *pcm = device->device_data; 953 struct list_head *list; 954 struct snd_pcm_substream *substream; 955 int cidx; 956 957 mutex_lock(®ister_mutex); 958 list_del_init(&pcm->list); 959 for (cidx = 0; cidx < 2; cidx++) 960 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 961 if (substream->runtime) 962 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; 963 list_for_each(list, &snd_pcm_notify_list) { 964 struct snd_pcm_notify *notify; 965 notify = list_entry(list, struct snd_pcm_notify, list); 966 notify->n_disconnect(pcm); 967 } 968 mutex_unlock(®ister_mutex); 969 return 0; 970 } 971 972 static int snd_pcm_dev_unregister(struct snd_device *device) 973 { 974 int cidx, devtype; 975 struct snd_pcm_substream *substream; 976 struct list_head *list; 977 struct snd_pcm *pcm = device->device_data; 978 979 snd_assert(pcm != NULL, return -ENXIO); 980 mutex_lock(®ister_mutex); 981 list_del(&pcm->list); 982 for (cidx = 0; cidx < 2; cidx++) { 983 devtype = -1; 984 switch (cidx) { 985 case SNDRV_PCM_STREAM_PLAYBACK: 986 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; 987 break; 988 case SNDRV_PCM_STREAM_CAPTURE: 989 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; 990 break; 991 } 992 snd_unregister_device(devtype, pcm->card, pcm->device); 993 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) 994 snd_pcm_timer_done(substream); 995 } 996 list_for_each(list, &snd_pcm_notify_list) { 997 struct snd_pcm_notify *notify; 998 notify = list_entry(list, struct snd_pcm_notify, list); 999 notify->n_unregister(pcm); 1000 } 1001 mutex_unlock(®ister_mutex); 1002 return snd_pcm_free(pcm); 1003 } 1004 1005 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) 1006 { 1007 struct list_head *p; 1008 1009 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); 1010 mutex_lock(®ister_mutex); 1011 if (nfree) { 1012 list_del(¬ify->list); 1013 list_for_each(p, &snd_pcm_devices) 1014 notify->n_unregister(list_entry(p, 1015 struct snd_pcm, list)); 1016 } else { 1017 list_add_tail(¬ify->list, &snd_pcm_notify_list); 1018 list_for_each(p, &snd_pcm_devices) 1019 notify->n_register(list_entry(p, struct snd_pcm, list)); 1020 } 1021 mutex_unlock(®ister_mutex); 1022 return 0; 1023 } 1024 1025 #ifdef CONFIG_PROC_FS 1026 /* 1027 * Info interface 1028 */ 1029 1030 static void snd_pcm_proc_read(struct snd_info_entry *entry, 1031 struct snd_info_buffer *buffer) 1032 { 1033 struct list_head *p; 1034 struct snd_pcm *pcm; 1035 1036 mutex_lock(®ister_mutex); 1037 list_for_each(p, &snd_pcm_devices) { 1038 pcm = list_entry(p, struct snd_pcm, list); 1039 snd_iprintf(buffer, "%02i-%02i: %s : %s", 1040 pcm->card->number, pcm->device, pcm->id, pcm->name); 1041 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) 1042 snd_iprintf(buffer, " : playback %i", 1043 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); 1044 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) 1045 snd_iprintf(buffer, " : capture %i", 1046 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count); 1047 snd_iprintf(buffer, "\n"); 1048 } 1049 mutex_unlock(®ister_mutex); 1050 } 1051 1052 static struct snd_info_entry *snd_pcm_proc_entry = NULL; 1053 1054 static void snd_pcm_proc_init(void) 1055 { 1056 struct snd_info_entry *entry; 1057 1058 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) { 1059 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, 1060 snd_pcm_proc_read); 1061 if (snd_info_register(entry) < 0) { 1062 snd_info_free_entry(entry); 1063 entry = NULL; 1064 } 1065 } 1066 snd_pcm_proc_entry = entry; 1067 } 1068 1069 static void snd_pcm_proc_done(void) 1070 { 1071 if (snd_pcm_proc_entry) 1072 snd_info_unregister(snd_pcm_proc_entry); 1073 } 1074 1075 #else /* !CONFIG_PROC_FS */ 1076 #define snd_pcm_proc_init() 1077 #define snd_pcm_proc_done() 1078 #endif /* CONFIG_PROC_FS */ 1079 1080 1081 /* 1082 * ENTRY functions 1083 */ 1084 1085 static int __init alsa_pcm_init(void) 1086 { 1087 snd_ctl_register_ioctl(snd_pcm_control_ioctl); 1088 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl); 1089 snd_pcm_proc_init(); 1090 return 0; 1091 } 1092 1093 static void __exit alsa_pcm_exit(void) 1094 { 1095 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl); 1096 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl); 1097 snd_pcm_proc_done(); 1098 } 1099 1100 module_init(alsa_pcm_init) 1101 module_exit(alsa_pcm_exit) 1102 1103 EXPORT_SYMBOL(snd_pcm_new); 1104 EXPORT_SYMBOL(snd_pcm_new_stream); 1105 EXPORT_SYMBOL(snd_pcm_notify); 1106 EXPORT_SYMBOL(snd_pcm_open_substream); 1107 EXPORT_SYMBOL(snd_pcm_release_substream); 1108 /* pcm_native.c */ 1109 EXPORT_SYMBOL(snd_pcm_link_rwlock); 1110 #ifdef CONFIG_PM 1111 EXPORT_SYMBOL(snd_pcm_suspend); 1112 EXPORT_SYMBOL(snd_pcm_suspend_all); 1113 #endif 1114 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl); 1115 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl); 1116 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 1117 EXPORT_SYMBOL(snd_pcm_mmap_data); 1118 #if SNDRV_PCM_INFO_MMAP_IOMEM 1119 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 1120 #endif 1121 /* pcm_misc.c */ 1122 EXPORT_SYMBOL(snd_pcm_format_signed); 1123 EXPORT_SYMBOL(snd_pcm_format_unsigned); 1124 EXPORT_SYMBOL(snd_pcm_format_linear); 1125 EXPORT_SYMBOL(snd_pcm_format_little_endian); 1126 EXPORT_SYMBOL(snd_pcm_format_big_endian); 1127 EXPORT_SYMBOL(snd_pcm_format_width); 1128 EXPORT_SYMBOL(snd_pcm_format_physical_width); 1129 EXPORT_SYMBOL(snd_pcm_format_size); 1130 EXPORT_SYMBOL(snd_pcm_format_silence_64); 1131 EXPORT_SYMBOL(snd_pcm_format_set_silence); 1132 EXPORT_SYMBOL(snd_pcm_build_linear_format); 1133 EXPORT_SYMBOL(snd_pcm_limit_hw_rates); 1134