1 /* 2 * Timers 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/delay.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/moduleparam.h> 28 #include <linux/string.h> 29 #include <sound/core.h> 30 #include <sound/timer.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 #include <sound/minors.h> 34 #include <sound/initval.h> 35 #include <linux/kmod.h> 36 37 #if defined(CONFIG_SND_HRTIMER) || defined(CONFIG_SND_HRTIMER_MODULE) 38 #define DEFAULT_TIMER_LIMIT 4 39 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) 40 #define DEFAULT_TIMER_LIMIT 2 41 #else 42 #define DEFAULT_TIMER_LIMIT 1 43 #endif 44 45 static int timer_limit = DEFAULT_TIMER_LIMIT; 46 static int timer_tstamp_monotonic = 1; 47 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 48 MODULE_DESCRIPTION("ALSA timer interface"); 49 MODULE_LICENSE("GPL"); 50 module_param(timer_limit, int, 0444); 51 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 52 module_param(timer_tstamp_monotonic, int, 0444); 53 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 54 55 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 56 MODULE_ALIAS("devname:snd/timer"); 57 58 struct snd_timer_user { 59 struct snd_timer_instance *timeri; 60 int tread; /* enhanced read with timestamps and events */ 61 unsigned long ticks; 62 unsigned long overrun; 63 int qhead; 64 int qtail; 65 int qused; 66 int queue_size; 67 struct snd_timer_read *queue; 68 struct snd_timer_tread *tqueue; 69 spinlock_t qlock; 70 unsigned long last_resolution; 71 unsigned int filter; 72 struct timespec tstamp; /* trigger tstamp */ 73 wait_queue_head_t qchange_sleep; 74 struct fasync_struct *fasync; 75 struct mutex tread_sem; 76 }; 77 78 /* list of timers */ 79 static LIST_HEAD(snd_timer_list); 80 81 /* list of slave instances */ 82 static LIST_HEAD(snd_timer_slave_list); 83 84 /* lock for slave active lists */ 85 static DEFINE_SPINLOCK(slave_active_lock); 86 87 static DEFINE_MUTEX(register_mutex); 88 89 static int snd_timer_free(struct snd_timer *timer); 90 static int snd_timer_dev_free(struct snd_device *device); 91 static int snd_timer_dev_register(struct snd_device *device); 92 static int snd_timer_dev_disconnect(struct snd_device *device); 93 94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 95 96 /* 97 * create a timer instance with the given owner string. 98 * when timer is not NULL, increments the module counter 99 */ 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 101 struct snd_timer *timer) 102 { 103 struct snd_timer_instance *timeri; 104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 105 if (timeri == NULL) 106 return NULL; 107 timeri->owner = kstrdup(owner, GFP_KERNEL); 108 if (! timeri->owner) { 109 kfree(timeri); 110 return NULL; 111 } 112 INIT_LIST_HEAD(&timeri->open_list); 113 INIT_LIST_HEAD(&timeri->active_list); 114 INIT_LIST_HEAD(&timeri->ack_list); 115 INIT_LIST_HEAD(&timeri->slave_list_head); 116 INIT_LIST_HEAD(&timeri->slave_active_head); 117 118 timeri->timer = timer; 119 if (timer && !try_module_get(timer->module)) { 120 kfree(timeri->owner); 121 kfree(timeri); 122 return NULL; 123 } 124 125 return timeri; 126 } 127 128 /* 129 * find a timer instance from the given timer id 130 */ 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 132 { 133 struct snd_timer *timer = NULL; 134 135 list_for_each_entry(timer, &snd_timer_list, device_list) { 136 if (timer->tmr_class != tid->dev_class) 137 continue; 138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 140 (timer->card == NULL || 141 timer->card->number != tid->card)) 142 continue; 143 if (timer->tmr_device != tid->device) 144 continue; 145 if (timer->tmr_subdevice != tid->subdevice) 146 continue; 147 return timer; 148 } 149 return NULL; 150 } 151 152 #ifdef CONFIG_MODULES 153 154 static void snd_timer_request(struct snd_timer_id *tid) 155 { 156 switch (tid->dev_class) { 157 case SNDRV_TIMER_CLASS_GLOBAL: 158 if (tid->device < timer_limit) 159 request_module("snd-timer-%i", tid->device); 160 break; 161 case SNDRV_TIMER_CLASS_CARD: 162 case SNDRV_TIMER_CLASS_PCM: 163 if (tid->card < snd_ecards_limit) 164 request_module("snd-card-%i", tid->card); 165 break; 166 default: 167 break; 168 } 169 } 170 171 #endif 172 173 /* 174 * look for a master instance matching with the slave id of the given slave. 175 * when found, relink the open_link of the slave. 176 * 177 * call this with register_mutex down. 178 */ 179 static void snd_timer_check_slave(struct snd_timer_instance *slave) 180 { 181 struct snd_timer *timer; 182 struct snd_timer_instance *master; 183 184 /* FIXME: it's really dumb to look up all entries.. */ 185 list_for_each_entry(timer, &snd_timer_list, device_list) { 186 list_for_each_entry(master, &timer->open_list_head, open_list) { 187 if (slave->slave_class == master->slave_class && 188 slave->slave_id == master->slave_id) { 189 list_move_tail(&slave->open_list, 190 &master->slave_list_head); 191 spin_lock_irq(&slave_active_lock); 192 slave->master = master; 193 slave->timer = master->timer; 194 spin_unlock_irq(&slave_active_lock); 195 return; 196 } 197 } 198 } 199 } 200 201 /* 202 * look for slave instances matching with the slave id of the given master. 203 * when found, relink the open_link of slaves. 204 * 205 * call this with register_mutex down. 206 */ 207 static void snd_timer_check_master(struct snd_timer_instance *master) 208 { 209 struct snd_timer_instance *slave, *tmp; 210 211 /* check all pending slaves */ 212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 213 if (slave->slave_class == master->slave_class && 214 slave->slave_id == master->slave_id) { 215 list_move_tail(&slave->open_list, &master->slave_list_head); 216 spin_lock_irq(&slave_active_lock); 217 slave->master = master; 218 slave->timer = master->timer; 219 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 220 list_add_tail(&slave->active_list, 221 &master->slave_active_head); 222 spin_unlock_irq(&slave_active_lock); 223 } 224 } 225 } 226 227 /* 228 * open a timer instance 229 * when opening a master, the slave id must be here given. 230 */ 231 int snd_timer_open(struct snd_timer_instance **ti, 232 char *owner, struct snd_timer_id *tid, 233 unsigned int slave_id) 234 { 235 struct snd_timer *timer; 236 struct snd_timer_instance *timeri = NULL; 237 238 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 239 /* open a slave instance */ 240 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 241 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 242 snd_printd("invalid slave class %i\n", tid->dev_sclass); 243 return -EINVAL; 244 } 245 mutex_lock(®ister_mutex); 246 timeri = snd_timer_instance_new(owner, NULL); 247 if (!timeri) { 248 mutex_unlock(®ister_mutex); 249 return -ENOMEM; 250 } 251 timeri->slave_class = tid->dev_sclass; 252 timeri->slave_id = tid->device; 253 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 254 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 255 snd_timer_check_slave(timeri); 256 mutex_unlock(®ister_mutex); 257 *ti = timeri; 258 return 0; 259 } 260 261 /* open a master instance */ 262 mutex_lock(®ister_mutex); 263 timer = snd_timer_find(tid); 264 #ifdef CONFIG_MODULES 265 if (!timer) { 266 mutex_unlock(®ister_mutex); 267 snd_timer_request(tid); 268 mutex_lock(®ister_mutex); 269 timer = snd_timer_find(tid); 270 } 271 #endif 272 if (!timer) { 273 mutex_unlock(®ister_mutex); 274 return -ENODEV; 275 } 276 if (!list_empty(&timer->open_list_head)) { 277 timeri = list_entry(timer->open_list_head.next, 278 struct snd_timer_instance, open_list); 279 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 280 mutex_unlock(®ister_mutex); 281 return -EBUSY; 282 } 283 } 284 timeri = snd_timer_instance_new(owner, timer); 285 if (!timeri) { 286 mutex_unlock(®ister_mutex); 287 return -ENOMEM; 288 } 289 timeri->slave_class = tid->dev_sclass; 290 timeri->slave_id = slave_id; 291 if (list_empty(&timer->open_list_head) && timer->hw.open) 292 timer->hw.open(timer); 293 list_add_tail(&timeri->open_list, &timer->open_list_head); 294 snd_timer_check_master(timeri); 295 mutex_unlock(®ister_mutex); 296 *ti = timeri; 297 return 0; 298 } 299 300 static int _snd_timer_stop(struct snd_timer_instance *timeri, 301 int keep_flag, int event); 302 303 /* 304 * close a timer instance 305 */ 306 int snd_timer_close(struct snd_timer_instance *timeri) 307 { 308 struct snd_timer *timer = NULL; 309 struct snd_timer_instance *slave, *tmp; 310 311 if (snd_BUG_ON(!timeri)) 312 return -ENXIO; 313 314 /* force to stop the timer */ 315 snd_timer_stop(timeri); 316 317 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 318 /* wait, until the active callback is finished */ 319 spin_lock_irq(&slave_active_lock); 320 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 321 spin_unlock_irq(&slave_active_lock); 322 udelay(10); 323 spin_lock_irq(&slave_active_lock); 324 } 325 spin_unlock_irq(&slave_active_lock); 326 mutex_lock(®ister_mutex); 327 list_del(&timeri->open_list); 328 mutex_unlock(®ister_mutex); 329 } else { 330 timer = timeri->timer; 331 if (snd_BUG_ON(!timer)) 332 goto out; 333 /* wait, until the active callback is finished */ 334 spin_lock_irq(&timer->lock); 335 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 336 spin_unlock_irq(&timer->lock); 337 udelay(10); 338 spin_lock_irq(&timer->lock); 339 } 340 spin_unlock_irq(&timer->lock); 341 mutex_lock(®ister_mutex); 342 list_del(&timeri->open_list); 343 if (timer && list_empty(&timer->open_list_head) && 344 timer->hw.close) 345 timer->hw.close(timer); 346 /* remove slave links */ 347 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 348 open_list) { 349 spin_lock_irq(&slave_active_lock); 350 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 351 list_move_tail(&slave->open_list, &snd_timer_slave_list); 352 slave->master = NULL; 353 slave->timer = NULL; 354 spin_unlock_irq(&slave_active_lock); 355 } 356 mutex_unlock(®ister_mutex); 357 } 358 out: 359 if (timeri->private_free) 360 timeri->private_free(timeri); 361 kfree(timeri->owner); 362 kfree(timeri); 363 if (timer) 364 module_put(timer->module); 365 return 0; 366 } 367 368 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 369 { 370 struct snd_timer * timer; 371 372 if (timeri == NULL) 373 return 0; 374 if ((timer = timeri->timer) != NULL) { 375 if (timer->hw.c_resolution) 376 return timer->hw.c_resolution(timer); 377 return timer->hw.resolution; 378 } 379 return 0; 380 } 381 382 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 383 { 384 struct snd_timer *timer; 385 unsigned long flags; 386 unsigned long resolution = 0; 387 struct snd_timer_instance *ts; 388 struct timespec tstamp; 389 390 if (timer_tstamp_monotonic) 391 do_posix_clock_monotonic_gettime(&tstamp); 392 else 393 getnstimeofday(&tstamp); 394 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 395 event > SNDRV_TIMER_EVENT_PAUSE)) 396 return; 397 if (event == SNDRV_TIMER_EVENT_START || 398 event == SNDRV_TIMER_EVENT_CONTINUE) 399 resolution = snd_timer_resolution(ti); 400 if (ti->ccallback) 401 ti->ccallback(ti, event, &tstamp, resolution); 402 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 403 return; 404 timer = ti->timer; 405 if (timer == NULL) 406 return; 407 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 408 return; 409 spin_lock_irqsave(&timer->lock, flags); 410 list_for_each_entry(ts, &ti->slave_active_head, active_list) 411 if (ts->ccallback) 412 ts->ccallback(ti, event + 100, &tstamp, resolution); 413 spin_unlock_irqrestore(&timer->lock, flags); 414 } 415 416 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 417 unsigned long sticks) 418 { 419 list_move_tail(&timeri->active_list, &timer->active_list_head); 420 if (timer->running) { 421 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 422 goto __start_now; 423 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 424 timeri->flags |= SNDRV_TIMER_IFLG_START; 425 return 1; /* delayed start */ 426 } else { 427 timer->sticks = sticks; 428 timer->hw.start(timer); 429 __start_now: 430 timer->running++; 431 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 432 return 0; 433 } 434 } 435 436 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 437 { 438 unsigned long flags; 439 440 spin_lock_irqsave(&slave_active_lock, flags); 441 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 442 if (timeri->master) 443 list_add_tail(&timeri->active_list, 444 &timeri->master->slave_active_head); 445 spin_unlock_irqrestore(&slave_active_lock, flags); 446 return 1; /* delayed start */ 447 } 448 449 /* 450 * start the timer instance 451 */ 452 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 453 { 454 struct snd_timer *timer; 455 int result = -EINVAL; 456 unsigned long flags; 457 458 if (timeri == NULL || ticks < 1) 459 return -EINVAL; 460 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 461 result = snd_timer_start_slave(timeri); 462 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 463 return result; 464 } 465 timer = timeri->timer; 466 if (timer == NULL) 467 return -EINVAL; 468 spin_lock_irqsave(&timer->lock, flags); 469 timeri->ticks = timeri->cticks = ticks; 470 timeri->pticks = 0; 471 result = snd_timer_start1(timer, timeri, ticks); 472 spin_unlock_irqrestore(&timer->lock, flags); 473 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 474 return result; 475 } 476 477 static int _snd_timer_stop(struct snd_timer_instance * timeri, 478 int keep_flag, int event) 479 { 480 struct snd_timer *timer; 481 unsigned long flags; 482 483 if (snd_BUG_ON(!timeri)) 484 return -ENXIO; 485 486 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 487 if (!keep_flag) { 488 spin_lock_irqsave(&slave_active_lock, flags); 489 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 490 spin_unlock_irqrestore(&slave_active_lock, flags); 491 } 492 goto __end; 493 } 494 timer = timeri->timer; 495 if (!timer) 496 return -EINVAL; 497 spin_lock_irqsave(&timer->lock, flags); 498 list_del_init(&timeri->ack_list); 499 list_del_init(&timeri->active_list); 500 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 501 !(--timer->running)) { 502 timer->hw.stop(timer); 503 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 504 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 505 snd_timer_reschedule(timer, 0); 506 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 507 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 508 timer->hw.start(timer); 509 } 510 } 511 } 512 if (!keep_flag) 513 timeri->flags &= 514 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 515 spin_unlock_irqrestore(&timer->lock, flags); 516 __end: 517 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 518 snd_timer_notify1(timeri, event); 519 return 0; 520 } 521 522 /* 523 * stop the timer instance. 524 * 525 * do not call this from the timer callback! 526 */ 527 int snd_timer_stop(struct snd_timer_instance *timeri) 528 { 529 struct snd_timer *timer; 530 unsigned long flags; 531 int err; 532 533 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 534 if (err < 0) 535 return err; 536 timer = timeri->timer; 537 if (!timer) 538 return -EINVAL; 539 spin_lock_irqsave(&timer->lock, flags); 540 timeri->cticks = timeri->ticks; 541 timeri->pticks = 0; 542 spin_unlock_irqrestore(&timer->lock, flags); 543 return 0; 544 } 545 546 /* 547 * start again.. the tick is kept. 548 */ 549 int snd_timer_continue(struct snd_timer_instance *timeri) 550 { 551 struct snd_timer *timer; 552 int result = -EINVAL; 553 unsigned long flags; 554 555 if (timeri == NULL) 556 return result; 557 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 558 return snd_timer_start_slave(timeri); 559 timer = timeri->timer; 560 if (! timer) 561 return -EINVAL; 562 spin_lock_irqsave(&timer->lock, flags); 563 if (!timeri->cticks) 564 timeri->cticks = 1; 565 timeri->pticks = 0; 566 result = snd_timer_start1(timer, timeri, timer->sticks); 567 spin_unlock_irqrestore(&timer->lock, flags); 568 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 569 return result; 570 } 571 572 /* 573 * pause.. remember the ticks left 574 */ 575 int snd_timer_pause(struct snd_timer_instance * timeri) 576 { 577 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 578 } 579 580 /* 581 * reschedule the timer 582 * 583 * start pending instances and check the scheduling ticks. 584 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 585 */ 586 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 587 { 588 struct snd_timer_instance *ti; 589 unsigned long ticks = ~0UL; 590 591 list_for_each_entry(ti, &timer->active_list_head, active_list) { 592 if (ti->flags & SNDRV_TIMER_IFLG_START) { 593 ti->flags &= ~SNDRV_TIMER_IFLG_START; 594 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 595 timer->running++; 596 } 597 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 598 if (ticks > ti->cticks) 599 ticks = ti->cticks; 600 } 601 } 602 if (ticks == ~0UL) { 603 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 604 return; 605 } 606 if (ticks > timer->hw.ticks) 607 ticks = timer->hw.ticks; 608 if (ticks_left != ticks) 609 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 610 timer->sticks = ticks; 611 } 612 613 /* 614 * timer tasklet 615 * 616 */ 617 static void snd_timer_tasklet(unsigned long arg) 618 { 619 struct snd_timer *timer = (struct snd_timer *) arg; 620 struct snd_timer_instance *ti; 621 struct list_head *p; 622 unsigned long resolution, ticks; 623 unsigned long flags; 624 625 spin_lock_irqsave(&timer->lock, flags); 626 /* now process all callbacks */ 627 while (!list_empty(&timer->sack_list_head)) { 628 p = timer->sack_list_head.next; /* get first item */ 629 ti = list_entry(p, struct snd_timer_instance, ack_list); 630 631 /* remove from ack_list and make empty */ 632 list_del_init(p); 633 634 ticks = ti->pticks; 635 ti->pticks = 0; 636 resolution = ti->resolution; 637 638 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 639 spin_unlock(&timer->lock); 640 if (ti->callback) 641 ti->callback(ti, resolution, ticks); 642 spin_lock(&timer->lock); 643 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 644 } 645 spin_unlock_irqrestore(&timer->lock, flags); 646 } 647 648 /* 649 * timer interrupt 650 * 651 * ticks_left is usually equal to timer->sticks. 652 * 653 */ 654 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 655 { 656 struct snd_timer_instance *ti, *ts, *tmp; 657 unsigned long resolution, ticks; 658 struct list_head *p, *ack_list_head; 659 unsigned long flags; 660 int use_tasklet = 0; 661 662 if (timer == NULL) 663 return; 664 665 spin_lock_irqsave(&timer->lock, flags); 666 667 /* remember the current resolution */ 668 if (timer->hw.c_resolution) 669 resolution = timer->hw.c_resolution(timer); 670 else 671 resolution = timer->hw.resolution; 672 673 /* loop for all active instances 674 * Here we cannot use list_for_each_entry because the active_list of a 675 * processed instance is relinked to done_list_head before the callback 676 * is called. 677 */ 678 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 679 active_list) { 680 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 681 continue; 682 ti->pticks += ticks_left; 683 ti->resolution = resolution; 684 if (ti->cticks < ticks_left) 685 ti->cticks = 0; 686 else 687 ti->cticks -= ticks_left; 688 if (ti->cticks) /* not expired */ 689 continue; 690 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 691 ti->cticks = ti->ticks; 692 } else { 693 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 694 if (--timer->running) 695 list_del(&ti->active_list); 696 } 697 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 698 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 699 ack_list_head = &timer->ack_list_head; 700 else 701 ack_list_head = &timer->sack_list_head; 702 if (list_empty(&ti->ack_list)) 703 list_add_tail(&ti->ack_list, ack_list_head); 704 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 705 ts->pticks = ti->pticks; 706 ts->resolution = resolution; 707 if (list_empty(&ts->ack_list)) 708 list_add_tail(&ts->ack_list, ack_list_head); 709 } 710 } 711 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 712 snd_timer_reschedule(timer, timer->sticks); 713 if (timer->running) { 714 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 715 timer->hw.stop(timer); 716 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 717 } 718 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 719 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 720 /* restart timer */ 721 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 722 timer->hw.start(timer); 723 } 724 } else { 725 timer->hw.stop(timer); 726 } 727 728 /* now process all fast callbacks */ 729 while (!list_empty(&timer->ack_list_head)) { 730 p = timer->ack_list_head.next; /* get first item */ 731 ti = list_entry(p, struct snd_timer_instance, ack_list); 732 733 /* remove from ack_list and make empty */ 734 list_del_init(p); 735 736 ticks = ti->pticks; 737 ti->pticks = 0; 738 739 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 740 spin_unlock(&timer->lock); 741 if (ti->callback) 742 ti->callback(ti, resolution, ticks); 743 spin_lock(&timer->lock); 744 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 745 } 746 747 /* do we have any slow callbacks? */ 748 use_tasklet = !list_empty(&timer->sack_list_head); 749 spin_unlock_irqrestore(&timer->lock, flags); 750 751 if (use_tasklet) 752 tasklet_schedule(&timer->task_queue); 753 } 754 755 /* 756 757 */ 758 759 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 760 struct snd_timer **rtimer) 761 { 762 struct snd_timer *timer; 763 int err; 764 static struct snd_device_ops ops = { 765 .dev_free = snd_timer_dev_free, 766 .dev_register = snd_timer_dev_register, 767 .dev_disconnect = snd_timer_dev_disconnect, 768 }; 769 770 if (snd_BUG_ON(!tid)) 771 return -EINVAL; 772 if (rtimer) 773 *rtimer = NULL; 774 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 775 if (timer == NULL) { 776 snd_printk(KERN_ERR "timer: cannot allocate\n"); 777 return -ENOMEM; 778 } 779 timer->tmr_class = tid->dev_class; 780 timer->card = card; 781 timer->tmr_device = tid->device; 782 timer->tmr_subdevice = tid->subdevice; 783 if (id) 784 strlcpy(timer->id, id, sizeof(timer->id)); 785 INIT_LIST_HEAD(&timer->device_list); 786 INIT_LIST_HEAD(&timer->open_list_head); 787 INIT_LIST_HEAD(&timer->active_list_head); 788 INIT_LIST_HEAD(&timer->ack_list_head); 789 INIT_LIST_HEAD(&timer->sack_list_head); 790 spin_lock_init(&timer->lock); 791 tasklet_init(&timer->task_queue, snd_timer_tasklet, 792 (unsigned long)timer); 793 if (card != NULL) { 794 timer->module = card->module; 795 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 796 if (err < 0) { 797 snd_timer_free(timer); 798 return err; 799 } 800 } 801 if (rtimer) 802 *rtimer = timer; 803 return 0; 804 } 805 806 static int snd_timer_free(struct snd_timer *timer) 807 { 808 if (!timer) 809 return 0; 810 811 mutex_lock(®ister_mutex); 812 if (! list_empty(&timer->open_list_head)) { 813 struct list_head *p, *n; 814 struct snd_timer_instance *ti; 815 snd_printk(KERN_WARNING "timer %p is busy?\n", timer); 816 list_for_each_safe(p, n, &timer->open_list_head) { 817 list_del_init(p); 818 ti = list_entry(p, struct snd_timer_instance, open_list); 819 ti->timer = NULL; 820 } 821 } 822 list_del(&timer->device_list); 823 mutex_unlock(®ister_mutex); 824 825 if (timer->private_free) 826 timer->private_free(timer); 827 kfree(timer); 828 return 0; 829 } 830 831 static int snd_timer_dev_free(struct snd_device *device) 832 { 833 struct snd_timer *timer = device->device_data; 834 return snd_timer_free(timer); 835 } 836 837 static int snd_timer_dev_register(struct snd_device *dev) 838 { 839 struct snd_timer *timer = dev->device_data; 840 struct snd_timer *timer1; 841 842 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 843 return -ENXIO; 844 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 845 !timer->hw.resolution && timer->hw.c_resolution == NULL) 846 return -EINVAL; 847 848 mutex_lock(®ister_mutex); 849 list_for_each_entry(timer1, &snd_timer_list, device_list) { 850 if (timer1->tmr_class > timer->tmr_class) 851 break; 852 if (timer1->tmr_class < timer->tmr_class) 853 continue; 854 if (timer1->card && timer->card) { 855 if (timer1->card->number > timer->card->number) 856 break; 857 if (timer1->card->number < timer->card->number) 858 continue; 859 } 860 if (timer1->tmr_device > timer->tmr_device) 861 break; 862 if (timer1->tmr_device < timer->tmr_device) 863 continue; 864 if (timer1->tmr_subdevice > timer->tmr_subdevice) 865 break; 866 if (timer1->tmr_subdevice < timer->tmr_subdevice) 867 continue; 868 /* conflicts.. */ 869 mutex_unlock(®ister_mutex); 870 return -EBUSY; 871 } 872 list_add_tail(&timer->device_list, &timer1->device_list); 873 mutex_unlock(®ister_mutex); 874 return 0; 875 } 876 877 static int snd_timer_dev_disconnect(struct snd_device *device) 878 { 879 struct snd_timer *timer = device->device_data; 880 mutex_lock(®ister_mutex); 881 list_del_init(&timer->device_list); 882 mutex_unlock(®ister_mutex); 883 return 0; 884 } 885 886 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 887 { 888 unsigned long flags; 889 unsigned long resolution = 0; 890 struct snd_timer_instance *ti, *ts; 891 892 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 893 return; 894 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 895 event > SNDRV_TIMER_EVENT_MRESUME)) 896 return; 897 spin_lock_irqsave(&timer->lock, flags); 898 if (event == SNDRV_TIMER_EVENT_MSTART || 899 event == SNDRV_TIMER_EVENT_MCONTINUE || 900 event == SNDRV_TIMER_EVENT_MRESUME) { 901 if (timer->hw.c_resolution) 902 resolution = timer->hw.c_resolution(timer); 903 else 904 resolution = timer->hw.resolution; 905 } 906 list_for_each_entry(ti, &timer->active_list_head, active_list) { 907 if (ti->ccallback) 908 ti->ccallback(ti, event, tstamp, resolution); 909 list_for_each_entry(ts, &ti->slave_active_head, active_list) 910 if (ts->ccallback) 911 ts->ccallback(ts, event, tstamp, resolution); 912 } 913 spin_unlock_irqrestore(&timer->lock, flags); 914 } 915 916 /* 917 * exported functions for global timers 918 */ 919 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 920 { 921 struct snd_timer_id tid; 922 923 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 924 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 925 tid.card = -1; 926 tid.device = device; 927 tid.subdevice = 0; 928 return snd_timer_new(NULL, id, &tid, rtimer); 929 } 930 931 int snd_timer_global_free(struct snd_timer *timer) 932 { 933 return snd_timer_free(timer); 934 } 935 936 int snd_timer_global_register(struct snd_timer *timer) 937 { 938 struct snd_device dev; 939 940 memset(&dev, 0, sizeof(dev)); 941 dev.device_data = timer; 942 return snd_timer_dev_register(&dev); 943 } 944 945 /* 946 * System timer 947 */ 948 949 struct snd_timer_system_private { 950 struct timer_list tlist; 951 unsigned long last_expires; 952 unsigned long last_jiffies; 953 unsigned long correction; 954 }; 955 956 static void snd_timer_s_function(unsigned long data) 957 { 958 struct snd_timer *timer = (struct snd_timer *)data; 959 struct snd_timer_system_private *priv = timer->private_data; 960 unsigned long jiff = jiffies; 961 if (time_after(jiff, priv->last_expires)) 962 priv->correction += (long)jiff - (long)priv->last_expires; 963 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 964 } 965 966 static int snd_timer_s_start(struct snd_timer * timer) 967 { 968 struct snd_timer_system_private *priv; 969 unsigned long njiff; 970 971 priv = (struct snd_timer_system_private *) timer->private_data; 972 njiff = (priv->last_jiffies = jiffies); 973 if (priv->correction > timer->sticks - 1) { 974 priv->correction -= timer->sticks - 1; 975 njiff++; 976 } else { 977 njiff += timer->sticks - priv->correction; 978 priv->correction = 0; 979 } 980 priv->last_expires = priv->tlist.expires = njiff; 981 add_timer(&priv->tlist); 982 return 0; 983 } 984 985 static int snd_timer_s_stop(struct snd_timer * timer) 986 { 987 struct snd_timer_system_private *priv; 988 unsigned long jiff; 989 990 priv = (struct snd_timer_system_private *) timer->private_data; 991 del_timer(&priv->tlist); 992 jiff = jiffies; 993 if (time_before(jiff, priv->last_expires)) 994 timer->sticks = priv->last_expires - jiff; 995 else 996 timer->sticks = 1; 997 priv->correction = 0; 998 return 0; 999 } 1000 1001 static struct snd_timer_hardware snd_timer_system = 1002 { 1003 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1004 .resolution = 1000000000L / HZ, 1005 .ticks = 10000000L, 1006 .start = snd_timer_s_start, 1007 .stop = snd_timer_s_stop 1008 }; 1009 1010 static void snd_timer_free_system(struct snd_timer *timer) 1011 { 1012 kfree(timer->private_data); 1013 } 1014 1015 static int snd_timer_register_system(void) 1016 { 1017 struct snd_timer *timer; 1018 struct snd_timer_system_private *priv; 1019 int err; 1020 1021 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1022 if (err < 0) 1023 return err; 1024 strcpy(timer->name, "system timer"); 1025 timer->hw = snd_timer_system; 1026 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1027 if (priv == NULL) { 1028 snd_timer_free(timer); 1029 return -ENOMEM; 1030 } 1031 init_timer(&priv->tlist); 1032 priv->tlist.function = snd_timer_s_function; 1033 priv->tlist.data = (unsigned long) timer; 1034 timer->private_data = priv; 1035 timer->private_free = snd_timer_free_system; 1036 return snd_timer_global_register(timer); 1037 } 1038 1039 #ifdef CONFIG_PROC_FS 1040 /* 1041 * Info interface 1042 */ 1043 1044 static void snd_timer_proc_read(struct snd_info_entry *entry, 1045 struct snd_info_buffer *buffer) 1046 { 1047 struct snd_timer *timer; 1048 struct snd_timer_instance *ti; 1049 1050 mutex_lock(®ister_mutex); 1051 list_for_each_entry(timer, &snd_timer_list, device_list) { 1052 switch (timer->tmr_class) { 1053 case SNDRV_TIMER_CLASS_GLOBAL: 1054 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1055 break; 1056 case SNDRV_TIMER_CLASS_CARD: 1057 snd_iprintf(buffer, "C%i-%i: ", 1058 timer->card->number, timer->tmr_device); 1059 break; 1060 case SNDRV_TIMER_CLASS_PCM: 1061 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1062 timer->tmr_device, timer->tmr_subdevice); 1063 break; 1064 default: 1065 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1066 timer->card ? timer->card->number : -1, 1067 timer->tmr_device, timer->tmr_subdevice); 1068 } 1069 snd_iprintf(buffer, "%s :", timer->name); 1070 if (timer->hw.resolution) 1071 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1072 timer->hw.resolution / 1000, 1073 timer->hw.resolution % 1000, 1074 timer->hw.ticks); 1075 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1076 snd_iprintf(buffer, " SLAVE"); 1077 snd_iprintf(buffer, "\n"); 1078 list_for_each_entry(ti, &timer->open_list_head, open_list) 1079 snd_iprintf(buffer, " Client %s : %s\n", 1080 ti->owner ? ti->owner : "unknown", 1081 ti->flags & (SNDRV_TIMER_IFLG_START | 1082 SNDRV_TIMER_IFLG_RUNNING) 1083 ? "running" : "stopped"); 1084 } 1085 mutex_unlock(®ister_mutex); 1086 } 1087 1088 static struct snd_info_entry *snd_timer_proc_entry; 1089 1090 static void __init snd_timer_proc_init(void) 1091 { 1092 struct snd_info_entry *entry; 1093 1094 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1095 if (entry != NULL) { 1096 entry->c.text.read = snd_timer_proc_read; 1097 if (snd_info_register(entry) < 0) { 1098 snd_info_free_entry(entry); 1099 entry = NULL; 1100 } 1101 } 1102 snd_timer_proc_entry = entry; 1103 } 1104 1105 static void __exit snd_timer_proc_done(void) 1106 { 1107 snd_info_free_entry(snd_timer_proc_entry); 1108 } 1109 #else /* !CONFIG_PROC_FS */ 1110 #define snd_timer_proc_init() 1111 #define snd_timer_proc_done() 1112 #endif 1113 1114 /* 1115 * USER SPACE interface 1116 */ 1117 1118 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1119 unsigned long resolution, 1120 unsigned long ticks) 1121 { 1122 struct snd_timer_user *tu = timeri->callback_data; 1123 struct snd_timer_read *r; 1124 int prev; 1125 1126 spin_lock(&tu->qlock); 1127 if (tu->qused > 0) { 1128 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1129 r = &tu->queue[prev]; 1130 if (r->resolution == resolution) { 1131 r->ticks += ticks; 1132 goto __wake; 1133 } 1134 } 1135 if (tu->qused >= tu->queue_size) { 1136 tu->overrun++; 1137 } else { 1138 r = &tu->queue[tu->qtail++]; 1139 tu->qtail %= tu->queue_size; 1140 r->resolution = resolution; 1141 r->ticks = ticks; 1142 tu->qused++; 1143 } 1144 __wake: 1145 spin_unlock(&tu->qlock); 1146 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1147 wake_up(&tu->qchange_sleep); 1148 } 1149 1150 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1151 struct snd_timer_tread *tread) 1152 { 1153 if (tu->qused >= tu->queue_size) { 1154 tu->overrun++; 1155 } else { 1156 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1157 tu->qtail %= tu->queue_size; 1158 tu->qused++; 1159 } 1160 } 1161 1162 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1163 int event, 1164 struct timespec *tstamp, 1165 unsigned long resolution) 1166 { 1167 struct snd_timer_user *tu = timeri->callback_data; 1168 struct snd_timer_tread r1; 1169 unsigned long flags; 1170 1171 if (event >= SNDRV_TIMER_EVENT_START && 1172 event <= SNDRV_TIMER_EVENT_PAUSE) 1173 tu->tstamp = *tstamp; 1174 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1175 return; 1176 r1.event = event; 1177 r1.tstamp = *tstamp; 1178 r1.val = resolution; 1179 spin_lock_irqsave(&tu->qlock, flags); 1180 snd_timer_user_append_to_tqueue(tu, &r1); 1181 spin_unlock_irqrestore(&tu->qlock, flags); 1182 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1183 wake_up(&tu->qchange_sleep); 1184 } 1185 1186 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1187 unsigned long resolution, 1188 unsigned long ticks) 1189 { 1190 struct snd_timer_user *tu = timeri->callback_data; 1191 struct snd_timer_tread *r, r1; 1192 struct timespec tstamp; 1193 int prev, append = 0; 1194 1195 memset(&tstamp, 0, sizeof(tstamp)); 1196 spin_lock(&tu->qlock); 1197 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1198 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1199 spin_unlock(&tu->qlock); 1200 return; 1201 } 1202 if (tu->last_resolution != resolution || ticks > 0) { 1203 if (timer_tstamp_monotonic) 1204 do_posix_clock_monotonic_gettime(&tstamp); 1205 else 1206 getnstimeofday(&tstamp); 1207 } 1208 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1209 tu->last_resolution != resolution) { 1210 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1211 r1.tstamp = tstamp; 1212 r1.val = resolution; 1213 snd_timer_user_append_to_tqueue(tu, &r1); 1214 tu->last_resolution = resolution; 1215 append++; 1216 } 1217 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1218 goto __wake; 1219 if (ticks == 0) 1220 goto __wake; 1221 if (tu->qused > 0) { 1222 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1223 r = &tu->tqueue[prev]; 1224 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1225 r->tstamp = tstamp; 1226 r->val += ticks; 1227 append++; 1228 goto __wake; 1229 } 1230 } 1231 r1.event = SNDRV_TIMER_EVENT_TICK; 1232 r1.tstamp = tstamp; 1233 r1.val = ticks; 1234 snd_timer_user_append_to_tqueue(tu, &r1); 1235 append++; 1236 __wake: 1237 spin_unlock(&tu->qlock); 1238 if (append == 0) 1239 return; 1240 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1241 wake_up(&tu->qchange_sleep); 1242 } 1243 1244 static int snd_timer_user_open(struct inode *inode, struct file *file) 1245 { 1246 struct snd_timer_user *tu; 1247 int err; 1248 1249 err = nonseekable_open(inode, file); 1250 if (err < 0) 1251 return err; 1252 1253 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1254 if (tu == NULL) 1255 return -ENOMEM; 1256 spin_lock_init(&tu->qlock); 1257 init_waitqueue_head(&tu->qchange_sleep); 1258 mutex_init(&tu->tread_sem); 1259 tu->ticks = 1; 1260 tu->queue_size = 128; 1261 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1262 GFP_KERNEL); 1263 if (tu->queue == NULL) { 1264 kfree(tu); 1265 return -ENOMEM; 1266 } 1267 file->private_data = tu; 1268 return 0; 1269 } 1270 1271 static int snd_timer_user_release(struct inode *inode, struct file *file) 1272 { 1273 struct snd_timer_user *tu; 1274 1275 if (file->private_data) { 1276 tu = file->private_data; 1277 file->private_data = NULL; 1278 if (tu->timeri) 1279 snd_timer_close(tu->timeri); 1280 kfree(tu->queue); 1281 kfree(tu->tqueue); 1282 kfree(tu); 1283 } 1284 return 0; 1285 } 1286 1287 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1288 { 1289 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1290 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1291 id->card = -1; 1292 id->device = -1; 1293 id->subdevice = -1; 1294 } 1295 1296 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1297 { 1298 id->dev_class = timer->tmr_class; 1299 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1300 id->card = timer->card ? timer->card->number : -1; 1301 id->device = timer->tmr_device; 1302 id->subdevice = timer->tmr_subdevice; 1303 } 1304 1305 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1306 { 1307 struct snd_timer_id id; 1308 struct snd_timer *timer; 1309 struct list_head *p; 1310 1311 if (copy_from_user(&id, _tid, sizeof(id))) 1312 return -EFAULT; 1313 mutex_lock(®ister_mutex); 1314 if (id.dev_class < 0) { /* first item */ 1315 if (list_empty(&snd_timer_list)) 1316 snd_timer_user_zero_id(&id); 1317 else { 1318 timer = list_entry(snd_timer_list.next, 1319 struct snd_timer, device_list); 1320 snd_timer_user_copy_id(&id, timer); 1321 } 1322 } else { 1323 switch (id.dev_class) { 1324 case SNDRV_TIMER_CLASS_GLOBAL: 1325 id.device = id.device < 0 ? 0 : id.device + 1; 1326 list_for_each(p, &snd_timer_list) { 1327 timer = list_entry(p, struct snd_timer, device_list); 1328 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1329 snd_timer_user_copy_id(&id, timer); 1330 break; 1331 } 1332 if (timer->tmr_device >= id.device) { 1333 snd_timer_user_copy_id(&id, timer); 1334 break; 1335 } 1336 } 1337 if (p == &snd_timer_list) 1338 snd_timer_user_zero_id(&id); 1339 break; 1340 case SNDRV_TIMER_CLASS_CARD: 1341 case SNDRV_TIMER_CLASS_PCM: 1342 if (id.card < 0) { 1343 id.card = 0; 1344 } else { 1345 if (id.card < 0) { 1346 id.card = 0; 1347 } else { 1348 if (id.device < 0) { 1349 id.device = 0; 1350 } else { 1351 if (id.subdevice < 0) { 1352 id.subdevice = 0; 1353 } else { 1354 id.subdevice++; 1355 } 1356 } 1357 } 1358 } 1359 list_for_each(p, &snd_timer_list) { 1360 timer = list_entry(p, struct snd_timer, device_list); 1361 if (timer->tmr_class > id.dev_class) { 1362 snd_timer_user_copy_id(&id, timer); 1363 break; 1364 } 1365 if (timer->tmr_class < id.dev_class) 1366 continue; 1367 if (timer->card->number > id.card) { 1368 snd_timer_user_copy_id(&id, timer); 1369 break; 1370 } 1371 if (timer->card->number < id.card) 1372 continue; 1373 if (timer->tmr_device > id.device) { 1374 snd_timer_user_copy_id(&id, timer); 1375 break; 1376 } 1377 if (timer->tmr_device < id.device) 1378 continue; 1379 if (timer->tmr_subdevice > id.subdevice) { 1380 snd_timer_user_copy_id(&id, timer); 1381 break; 1382 } 1383 if (timer->tmr_subdevice < id.subdevice) 1384 continue; 1385 snd_timer_user_copy_id(&id, timer); 1386 break; 1387 } 1388 if (p == &snd_timer_list) 1389 snd_timer_user_zero_id(&id); 1390 break; 1391 default: 1392 snd_timer_user_zero_id(&id); 1393 } 1394 } 1395 mutex_unlock(®ister_mutex); 1396 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1397 return -EFAULT; 1398 return 0; 1399 } 1400 1401 static int snd_timer_user_ginfo(struct file *file, 1402 struct snd_timer_ginfo __user *_ginfo) 1403 { 1404 struct snd_timer_ginfo *ginfo; 1405 struct snd_timer_id tid; 1406 struct snd_timer *t; 1407 struct list_head *p; 1408 int err = 0; 1409 1410 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1411 if (IS_ERR(ginfo)) 1412 return PTR_ERR(ginfo); 1413 1414 tid = ginfo->tid; 1415 memset(ginfo, 0, sizeof(*ginfo)); 1416 ginfo->tid = tid; 1417 mutex_lock(®ister_mutex); 1418 t = snd_timer_find(&tid); 1419 if (t != NULL) { 1420 ginfo->card = t->card ? t->card->number : -1; 1421 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1422 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1423 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1424 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1425 ginfo->resolution = t->hw.resolution; 1426 if (t->hw.resolution_min > 0) { 1427 ginfo->resolution_min = t->hw.resolution_min; 1428 ginfo->resolution_max = t->hw.resolution_max; 1429 } 1430 list_for_each(p, &t->open_list_head) { 1431 ginfo->clients++; 1432 } 1433 } else { 1434 err = -ENODEV; 1435 } 1436 mutex_unlock(®ister_mutex); 1437 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1438 err = -EFAULT; 1439 kfree(ginfo); 1440 return err; 1441 } 1442 1443 static int snd_timer_user_gparams(struct file *file, 1444 struct snd_timer_gparams __user *_gparams) 1445 { 1446 struct snd_timer_gparams gparams; 1447 struct snd_timer *t; 1448 int err; 1449 1450 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1451 return -EFAULT; 1452 mutex_lock(®ister_mutex); 1453 t = snd_timer_find(&gparams.tid); 1454 if (!t) { 1455 err = -ENODEV; 1456 goto _error; 1457 } 1458 if (!list_empty(&t->open_list_head)) { 1459 err = -EBUSY; 1460 goto _error; 1461 } 1462 if (!t->hw.set_period) { 1463 err = -ENOSYS; 1464 goto _error; 1465 } 1466 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1467 _error: 1468 mutex_unlock(®ister_mutex); 1469 return err; 1470 } 1471 1472 static int snd_timer_user_gstatus(struct file *file, 1473 struct snd_timer_gstatus __user *_gstatus) 1474 { 1475 struct snd_timer_gstatus gstatus; 1476 struct snd_timer_id tid; 1477 struct snd_timer *t; 1478 int err = 0; 1479 1480 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1481 return -EFAULT; 1482 tid = gstatus.tid; 1483 memset(&gstatus, 0, sizeof(gstatus)); 1484 gstatus.tid = tid; 1485 mutex_lock(®ister_mutex); 1486 t = snd_timer_find(&tid); 1487 if (t != NULL) { 1488 if (t->hw.c_resolution) 1489 gstatus.resolution = t->hw.c_resolution(t); 1490 else 1491 gstatus.resolution = t->hw.resolution; 1492 if (t->hw.precise_resolution) { 1493 t->hw.precise_resolution(t, &gstatus.resolution_num, 1494 &gstatus.resolution_den); 1495 } else { 1496 gstatus.resolution_num = gstatus.resolution; 1497 gstatus.resolution_den = 1000000000uL; 1498 } 1499 } else { 1500 err = -ENODEV; 1501 } 1502 mutex_unlock(®ister_mutex); 1503 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1504 err = -EFAULT; 1505 return err; 1506 } 1507 1508 static int snd_timer_user_tselect(struct file *file, 1509 struct snd_timer_select __user *_tselect) 1510 { 1511 struct snd_timer_user *tu; 1512 struct snd_timer_select tselect; 1513 char str[32]; 1514 int err = 0; 1515 1516 tu = file->private_data; 1517 mutex_lock(&tu->tread_sem); 1518 if (tu->timeri) { 1519 snd_timer_close(tu->timeri); 1520 tu->timeri = NULL; 1521 } 1522 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1523 err = -EFAULT; 1524 goto __err; 1525 } 1526 sprintf(str, "application %i", current->pid); 1527 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1528 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1529 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1530 if (err < 0) 1531 goto __err; 1532 1533 kfree(tu->queue); 1534 tu->queue = NULL; 1535 kfree(tu->tqueue); 1536 tu->tqueue = NULL; 1537 if (tu->tread) { 1538 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1539 GFP_KERNEL); 1540 if (tu->tqueue == NULL) 1541 err = -ENOMEM; 1542 } else { 1543 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1544 GFP_KERNEL); 1545 if (tu->queue == NULL) 1546 err = -ENOMEM; 1547 } 1548 1549 if (err < 0) { 1550 snd_timer_close(tu->timeri); 1551 tu->timeri = NULL; 1552 } else { 1553 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1554 tu->timeri->callback = tu->tread 1555 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1556 tu->timeri->ccallback = snd_timer_user_ccallback; 1557 tu->timeri->callback_data = (void *)tu; 1558 } 1559 1560 __err: 1561 mutex_unlock(&tu->tread_sem); 1562 return err; 1563 } 1564 1565 static int snd_timer_user_info(struct file *file, 1566 struct snd_timer_info __user *_info) 1567 { 1568 struct snd_timer_user *tu; 1569 struct snd_timer_info *info; 1570 struct snd_timer *t; 1571 int err = 0; 1572 1573 tu = file->private_data; 1574 if (!tu->timeri) 1575 return -EBADFD; 1576 t = tu->timeri->timer; 1577 if (!t) 1578 return -EBADFD; 1579 1580 info = kzalloc(sizeof(*info), GFP_KERNEL); 1581 if (! info) 1582 return -ENOMEM; 1583 info->card = t->card ? t->card->number : -1; 1584 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1585 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1586 strlcpy(info->id, t->id, sizeof(info->id)); 1587 strlcpy(info->name, t->name, sizeof(info->name)); 1588 info->resolution = t->hw.resolution; 1589 if (copy_to_user(_info, info, sizeof(*_info))) 1590 err = -EFAULT; 1591 kfree(info); 1592 return err; 1593 } 1594 1595 static int snd_timer_user_params(struct file *file, 1596 struct snd_timer_params __user *_params) 1597 { 1598 struct snd_timer_user *tu; 1599 struct snd_timer_params params; 1600 struct snd_timer *t; 1601 struct snd_timer_read *tr; 1602 struct snd_timer_tread *ttr; 1603 int err; 1604 1605 tu = file->private_data; 1606 if (!tu->timeri) 1607 return -EBADFD; 1608 t = tu->timeri->timer; 1609 if (!t) 1610 return -EBADFD; 1611 if (copy_from_user(¶ms, _params, sizeof(params))) 1612 return -EFAULT; 1613 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1614 err = -EINVAL; 1615 goto _end; 1616 } 1617 if (params.queue_size > 0 && 1618 (params.queue_size < 32 || params.queue_size > 1024)) { 1619 err = -EINVAL; 1620 goto _end; 1621 } 1622 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1623 (1<<SNDRV_TIMER_EVENT_TICK)| 1624 (1<<SNDRV_TIMER_EVENT_START)| 1625 (1<<SNDRV_TIMER_EVENT_STOP)| 1626 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1627 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1628 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1629 (1<<SNDRV_TIMER_EVENT_RESUME)| 1630 (1<<SNDRV_TIMER_EVENT_MSTART)| 1631 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1632 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1633 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1634 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1635 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1636 err = -EINVAL; 1637 goto _end; 1638 } 1639 snd_timer_stop(tu->timeri); 1640 spin_lock_irq(&t->lock); 1641 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1642 SNDRV_TIMER_IFLG_EXCLUSIVE| 1643 SNDRV_TIMER_IFLG_EARLY_EVENT); 1644 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1645 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1646 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1648 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1649 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1650 spin_unlock_irq(&t->lock); 1651 if (params.queue_size > 0 && 1652 (unsigned int)tu->queue_size != params.queue_size) { 1653 if (tu->tread) { 1654 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1655 GFP_KERNEL); 1656 if (ttr) { 1657 kfree(tu->tqueue); 1658 tu->queue_size = params.queue_size; 1659 tu->tqueue = ttr; 1660 } 1661 } else { 1662 tr = kmalloc(params.queue_size * sizeof(*tr), 1663 GFP_KERNEL); 1664 if (tr) { 1665 kfree(tu->queue); 1666 tu->queue_size = params.queue_size; 1667 tu->queue = tr; 1668 } 1669 } 1670 } 1671 tu->qhead = tu->qtail = tu->qused = 0; 1672 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1673 if (tu->tread) { 1674 struct snd_timer_tread tread; 1675 tread.event = SNDRV_TIMER_EVENT_EARLY; 1676 tread.tstamp.tv_sec = 0; 1677 tread.tstamp.tv_nsec = 0; 1678 tread.val = 0; 1679 snd_timer_user_append_to_tqueue(tu, &tread); 1680 } else { 1681 struct snd_timer_read *r = &tu->queue[0]; 1682 r->resolution = 0; 1683 r->ticks = 0; 1684 tu->qused++; 1685 tu->qtail++; 1686 } 1687 } 1688 tu->filter = params.filter; 1689 tu->ticks = params.ticks; 1690 err = 0; 1691 _end: 1692 if (copy_to_user(_params, ¶ms, sizeof(params))) 1693 return -EFAULT; 1694 return err; 1695 } 1696 1697 static int snd_timer_user_status(struct file *file, 1698 struct snd_timer_status __user *_status) 1699 { 1700 struct snd_timer_user *tu; 1701 struct snd_timer_status status; 1702 1703 tu = file->private_data; 1704 if (!tu->timeri) 1705 return -EBADFD; 1706 memset(&status, 0, sizeof(status)); 1707 status.tstamp = tu->tstamp; 1708 status.resolution = snd_timer_resolution(tu->timeri); 1709 status.lost = tu->timeri->lost; 1710 status.overrun = tu->overrun; 1711 spin_lock_irq(&tu->qlock); 1712 status.queue = tu->qused; 1713 spin_unlock_irq(&tu->qlock); 1714 if (copy_to_user(_status, &status, sizeof(status))) 1715 return -EFAULT; 1716 return 0; 1717 } 1718 1719 static int snd_timer_user_start(struct file *file) 1720 { 1721 int err; 1722 struct snd_timer_user *tu; 1723 1724 tu = file->private_data; 1725 if (!tu->timeri) 1726 return -EBADFD; 1727 snd_timer_stop(tu->timeri); 1728 tu->timeri->lost = 0; 1729 tu->last_resolution = 0; 1730 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1731 } 1732 1733 static int snd_timer_user_stop(struct file *file) 1734 { 1735 int err; 1736 struct snd_timer_user *tu; 1737 1738 tu = file->private_data; 1739 if (!tu->timeri) 1740 return -EBADFD; 1741 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1742 } 1743 1744 static int snd_timer_user_continue(struct file *file) 1745 { 1746 int err; 1747 struct snd_timer_user *tu; 1748 1749 tu = file->private_data; 1750 if (!tu->timeri) 1751 return -EBADFD; 1752 tu->timeri->lost = 0; 1753 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1754 } 1755 1756 static int snd_timer_user_pause(struct file *file) 1757 { 1758 int err; 1759 struct snd_timer_user *tu; 1760 1761 tu = file->private_data; 1762 if (!tu->timeri) 1763 return -EBADFD; 1764 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1765 } 1766 1767 enum { 1768 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1769 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1770 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1771 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1772 }; 1773 1774 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1775 unsigned long arg) 1776 { 1777 struct snd_timer_user *tu; 1778 void __user *argp = (void __user *)arg; 1779 int __user *p = argp; 1780 1781 tu = file->private_data; 1782 switch (cmd) { 1783 case SNDRV_TIMER_IOCTL_PVERSION: 1784 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1785 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1786 return snd_timer_user_next_device(argp); 1787 case SNDRV_TIMER_IOCTL_TREAD: 1788 { 1789 int xarg; 1790 1791 mutex_lock(&tu->tread_sem); 1792 if (tu->timeri) { /* too late */ 1793 mutex_unlock(&tu->tread_sem); 1794 return -EBUSY; 1795 } 1796 if (get_user(xarg, p)) { 1797 mutex_unlock(&tu->tread_sem); 1798 return -EFAULT; 1799 } 1800 tu->tread = xarg ? 1 : 0; 1801 mutex_unlock(&tu->tread_sem); 1802 return 0; 1803 } 1804 case SNDRV_TIMER_IOCTL_GINFO: 1805 return snd_timer_user_ginfo(file, argp); 1806 case SNDRV_TIMER_IOCTL_GPARAMS: 1807 return snd_timer_user_gparams(file, argp); 1808 case SNDRV_TIMER_IOCTL_GSTATUS: 1809 return snd_timer_user_gstatus(file, argp); 1810 case SNDRV_TIMER_IOCTL_SELECT: 1811 return snd_timer_user_tselect(file, argp); 1812 case SNDRV_TIMER_IOCTL_INFO: 1813 return snd_timer_user_info(file, argp); 1814 case SNDRV_TIMER_IOCTL_PARAMS: 1815 return snd_timer_user_params(file, argp); 1816 case SNDRV_TIMER_IOCTL_STATUS: 1817 return snd_timer_user_status(file, argp); 1818 case SNDRV_TIMER_IOCTL_START: 1819 case SNDRV_TIMER_IOCTL_START_OLD: 1820 return snd_timer_user_start(file); 1821 case SNDRV_TIMER_IOCTL_STOP: 1822 case SNDRV_TIMER_IOCTL_STOP_OLD: 1823 return snd_timer_user_stop(file); 1824 case SNDRV_TIMER_IOCTL_CONTINUE: 1825 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1826 return snd_timer_user_continue(file); 1827 case SNDRV_TIMER_IOCTL_PAUSE: 1828 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1829 return snd_timer_user_pause(file); 1830 } 1831 return -ENOTTY; 1832 } 1833 1834 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1835 { 1836 struct snd_timer_user *tu; 1837 1838 tu = file->private_data; 1839 return fasync_helper(fd, file, on, &tu->fasync); 1840 } 1841 1842 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1843 size_t count, loff_t *offset) 1844 { 1845 struct snd_timer_user *tu; 1846 long result = 0, unit; 1847 int err = 0; 1848 1849 tu = file->private_data; 1850 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1851 spin_lock_irq(&tu->qlock); 1852 while ((long)count - result >= unit) { 1853 while (!tu->qused) { 1854 wait_queue_t wait; 1855 1856 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1857 err = -EAGAIN; 1858 break; 1859 } 1860 1861 set_current_state(TASK_INTERRUPTIBLE); 1862 init_waitqueue_entry(&wait, current); 1863 add_wait_queue(&tu->qchange_sleep, &wait); 1864 1865 spin_unlock_irq(&tu->qlock); 1866 schedule(); 1867 spin_lock_irq(&tu->qlock); 1868 1869 remove_wait_queue(&tu->qchange_sleep, &wait); 1870 1871 if (signal_pending(current)) { 1872 err = -ERESTARTSYS; 1873 break; 1874 } 1875 } 1876 1877 spin_unlock_irq(&tu->qlock); 1878 if (err < 0) 1879 goto _error; 1880 1881 if (tu->tread) { 1882 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1883 sizeof(struct snd_timer_tread))) { 1884 err = -EFAULT; 1885 goto _error; 1886 } 1887 } else { 1888 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1889 sizeof(struct snd_timer_read))) { 1890 err = -EFAULT; 1891 goto _error; 1892 } 1893 } 1894 1895 tu->qhead %= tu->queue_size; 1896 1897 result += unit; 1898 buffer += unit; 1899 1900 spin_lock_irq(&tu->qlock); 1901 tu->qused--; 1902 } 1903 spin_unlock_irq(&tu->qlock); 1904 _error: 1905 return result > 0 ? result : err; 1906 } 1907 1908 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1909 { 1910 unsigned int mask; 1911 struct snd_timer_user *tu; 1912 1913 tu = file->private_data; 1914 1915 poll_wait(file, &tu->qchange_sleep, wait); 1916 1917 mask = 0; 1918 if (tu->qused) 1919 mask |= POLLIN | POLLRDNORM; 1920 1921 return mask; 1922 } 1923 1924 #ifdef CONFIG_COMPAT 1925 #include "timer_compat.c" 1926 #else 1927 #define snd_timer_user_ioctl_compat NULL 1928 #endif 1929 1930 static const struct file_operations snd_timer_f_ops = 1931 { 1932 .owner = THIS_MODULE, 1933 .read = snd_timer_user_read, 1934 .open = snd_timer_user_open, 1935 .release = snd_timer_user_release, 1936 .llseek = no_llseek, 1937 .poll = snd_timer_user_poll, 1938 .unlocked_ioctl = snd_timer_user_ioctl, 1939 .compat_ioctl = snd_timer_user_ioctl_compat, 1940 .fasync = snd_timer_user_fasync, 1941 }; 1942 1943 /* 1944 * ENTRY functions 1945 */ 1946 1947 static int __init alsa_timer_init(void) 1948 { 1949 int err; 1950 1951 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1952 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1953 "system timer"); 1954 #endif 1955 1956 if ((err = snd_timer_register_system()) < 0) 1957 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1958 err); 1959 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1960 &snd_timer_f_ops, NULL, "timer")) < 0) 1961 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1962 err); 1963 snd_timer_proc_init(); 1964 return 0; 1965 } 1966 1967 static void __exit alsa_timer_exit(void) 1968 { 1969 struct list_head *p, *n; 1970 1971 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1972 /* unregister the system timer */ 1973 list_for_each_safe(p, n, &snd_timer_list) { 1974 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1975 snd_timer_free(timer); 1976 } 1977 snd_timer_proc_done(); 1978 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1979 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1980 #endif 1981 } 1982 1983 module_init(alsa_timer_init) 1984 module_exit(alsa_timer_exit) 1985 1986 EXPORT_SYMBOL(snd_timer_open); 1987 EXPORT_SYMBOL(snd_timer_close); 1988 EXPORT_SYMBOL(snd_timer_resolution); 1989 EXPORT_SYMBOL(snd_timer_start); 1990 EXPORT_SYMBOL(snd_timer_stop); 1991 EXPORT_SYMBOL(snd_timer_continue); 1992 EXPORT_SYMBOL(snd_timer_pause); 1993 EXPORT_SYMBOL(snd_timer_new); 1994 EXPORT_SYMBOL(snd_timer_notify); 1995 EXPORT_SYMBOL(snd_timer_global_new); 1996 EXPORT_SYMBOL(snd_timer_global_free); 1997 EXPORT_SYMBOL(snd_timer_global_register); 1998 EXPORT_SYMBOL(snd_timer_interrupt); 1999