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