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/device.h> 28 #include <linux/module.h> 29 #include <linux/string.h> 30 #include <sound/core.h> 31 #include <sound/timer.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/minors.h> 35 #include <sound/initval.h> 36 #include <linux/kmod.h> 37 38 #if IS_ENABLED(CONFIG_SND_HRTIMER) 39 #define DEFAULT_TIMER_LIMIT 4 40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER) 41 #define DEFAULT_TIMER_LIMIT 2 42 #else 43 #define DEFAULT_TIMER_LIMIT 1 44 #endif 45 46 static int timer_limit = DEFAULT_TIMER_LIMIT; 47 static int timer_tstamp_monotonic = 1; 48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 49 MODULE_DESCRIPTION("ALSA timer interface"); 50 MODULE_LICENSE("GPL"); 51 module_param(timer_limit, int, 0444); 52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 53 module_param(timer_tstamp_monotonic, int, 0444); 54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 55 56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 57 MODULE_ALIAS("devname:snd/timer"); 58 59 struct snd_timer_user { 60 struct snd_timer_instance *timeri; 61 int tread; /* enhanced read with timestamps and events */ 62 unsigned long ticks; 63 unsigned long overrun; 64 int qhead; 65 int qtail; 66 int qused; 67 int queue_size; 68 struct snd_timer_read *queue; 69 struct snd_timer_tread *tqueue; 70 spinlock_t qlock; 71 unsigned long last_resolution; 72 unsigned int filter; 73 struct timespec tstamp; /* trigger tstamp */ 74 wait_queue_head_t qchange_sleep; 75 struct fasync_struct *fasync; 76 struct mutex tread_sem; 77 }; 78 79 /* list of timers */ 80 static LIST_HEAD(snd_timer_list); 81 82 /* list of slave instances */ 83 static LIST_HEAD(snd_timer_slave_list); 84 85 /* lock for slave active lists */ 86 static DEFINE_SPINLOCK(slave_active_lock); 87 88 static DEFINE_MUTEX(register_mutex); 89 90 static int snd_timer_free(struct snd_timer *timer); 91 static int snd_timer_dev_free(struct snd_device *device); 92 static int snd_timer_dev_register(struct snd_device *device); 93 static int snd_timer_dev_disconnect(struct snd_device *device); 94 95 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 96 97 /* 98 * create a timer instance with the given owner string. 99 * when timer is not NULL, increments the module counter 100 */ 101 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 102 struct snd_timer *timer) 103 { 104 struct snd_timer_instance *timeri; 105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 106 if (timeri == NULL) 107 return NULL; 108 timeri->owner = kstrdup(owner, GFP_KERNEL); 109 if (! timeri->owner) { 110 kfree(timeri); 111 return NULL; 112 } 113 INIT_LIST_HEAD(&timeri->open_list); 114 INIT_LIST_HEAD(&timeri->active_list); 115 INIT_LIST_HEAD(&timeri->ack_list); 116 INIT_LIST_HEAD(&timeri->slave_list_head); 117 INIT_LIST_HEAD(&timeri->slave_active_head); 118 119 timeri->timer = timer; 120 if (timer && !try_module_get(timer->module)) { 121 kfree(timeri->owner); 122 kfree(timeri); 123 return NULL; 124 } 125 126 return timeri; 127 } 128 129 /* 130 * find a timer instance from the given timer id 131 */ 132 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 133 { 134 struct snd_timer *timer = NULL; 135 136 list_for_each_entry(timer, &snd_timer_list, device_list) { 137 if (timer->tmr_class != tid->dev_class) 138 continue; 139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 141 (timer->card == NULL || 142 timer->card->number != tid->card)) 143 continue; 144 if (timer->tmr_device != tid->device) 145 continue; 146 if (timer->tmr_subdevice != tid->subdevice) 147 continue; 148 return timer; 149 } 150 return NULL; 151 } 152 153 #ifdef CONFIG_MODULES 154 155 static void snd_timer_request(struct snd_timer_id *tid) 156 { 157 switch (tid->dev_class) { 158 case SNDRV_TIMER_CLASS_GLOBAL: 159 if (tid->device < timer_limit) 160 request_module("snd-timer-%i", tid->device); 161 break; 162 case SNDRV_TIMER_CLASS_CARD: 163 case SNDRV_TIMER_CLASS_PCM: 164 if (tid->card < snd_ecards_limit) 165 request_module("snd-card-%i", tid->card); 166 break; 167 default: 168 break; 169 } 170 } 171 172 #endif 173 174 /* 175 * look for a master instance matching with the slave id of the given slave. 176 * when found, relink the open_link of the slave. 177 * 178 * call this with register_mutex down. 179 */ 180 static void snd_timer_check_slave(struct snd_timer_instance *slave) 181 { 182 struct snd_timer *timer; 183 struct snd_timer_instance *master; 184 185 /* FIXME: it's really dumb to look up all entries.. */ 186 list_for_each_entry(timer, &snd_timer_list, device_list) { 187 list_for_each_entry(master, &timer->open_list_head, open_list) { 188 if (slave->slave_class == master->slave_class && 189 slave->slave_id == master->slave_id) { 190 list_move_tail(&slave->open_list, 191 &master->slave_list_head); 192 spin_lock_irq(&slave_active_lock); 193 slave->master = master; 194 slave->timer = master->timer; 195 spin_unlock_irq(&slave_active_lock); 196 return; 197 } 198 } 199 } 200 } 201 202 /* 203 * look for slave instances matching with the slave id of the given master. 204 * when found, relink the open_link of slaves. 205 * 206 * call this with register_mutex down. 207 */ 208 static void snd_timer_check_master(struct snd_timer_instance *master) 209 { 210 struct snd_timer_instance *slave, *tmp; 211 212 /* check all pending slaves */ 213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 214 if (slave->slave_class == master->slave_class && 215 slave->slave_id == master->slave_id) { 216 list_move_tail(&slave->open_list, &master->slave_list_head); 217 spin_lock_irq(&slave_active_lock); 218 slave->master = master; 219 slave->timer = master->timer; 220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 221 list_add_tail(&slave->active_list, 222 &master->slave_active_head); 223 spin_unlock_irq(&slave_active_lock); 224 } 225 } 226 } 227 228 /* 229 * open a timer instance 230 * when opening a master, the slave id must be here given. 231 */ 232 int snd_timer_open(struct snd_timer_instance **ti, 233 char *owner, struct snd_timer_id *tid, 234 unsigned int slave_id) 235 { 236 struct snd_timer *timer; 237 struct snd_timer_instance *timeri = NULL; 238 239 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 240 /* open a slave instance */ 241 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 242 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 243 pr_debug("ALSA: timer: invalid slave class %i\n", 244 tid->dev_sclass); 245 return -EINVAL; 246 } 247 mutex_lock(®ister_mutex); 248 timeri = snd_timer_instance_new(owner, NULL); 249 if (!timeri) { 250 mutex_unlock(®ister_mutex); 251 return -ENOMEM; 252 } 253 timeri->slave_class = tid->dev_sclass; 254 timeri->slave_id = tid->device; 255 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 256 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 257 snd_timer_check_slave(timeri); 258 mutex_unlock(®ister_mutex); 259 *ti = timeri; 260 return 0; 261 } 262 263 /* open a master instance */ 264 mutex_lock(®ister_mutex); 265 timer = snd_timer_find(tid); 266 #ifdef CONFIG_MODULES 267 if (!timer) { 268 mutex_unlock(®ister_mutex); 269 snd_timer_request(tid); 270 mutex_lock(®ister_mutex); 271 timer = snd_timer_find(tid); 272 } 273 #endif 274 if (!timer) { 275 mutex_unlock(®ister_mutex); 276 return -ENODEV; 277 } 278 if (!list_empty(&timer->open_list_head)) { 279 timeri = list_entry(timer->open_list_head.next, 280 struct snd_timer_instance, open_list); 281 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 282 mutex_unlock(®ister_mutex); 283 return -EBUSY; 284 } 285 } 286 timeri = snd_timer_instance_new(owner, timer); 287 if (!timeri) { 288 mutex_unlock(®ister_mutex); 289 return -ENOMEM; 290 } 291 timeri->slave_class = tid->dev_sclass; 292 timeri->slave_id = slave_id; 293 if (list_empty(&timer->open_list_head) && timer->hw.open) 294 timer->hw.open(timer); 295 list_add_tail(&timeri->open_list, &timer->open_list_head); 296 snd_timer_check_master(timeri); 297 mutex_unlock(®ister_mutex); 298 *ti = timeri; 299 return 0; 300 } 301 302 static int _snd_timer_stop(struct snd_timer_instance *timeri, 303 int keep_flag, int event); 304 305 /* 306 * close a timer instance 307 */ 308 int snd_timer_close(struct snd_timer_instance *timeri) 309 { 310 struct snd_timer *timer = NULL; 311 struct snd_timer_instance *slave, *tmp; 312 313 if (snd_BUG_ON(!timeri)) 314 return -ENXIO; 315 316 /* force to stop the timer */ 317 snd_timer_stop(timeri); 318 319 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 320 /* wait, until the active callback is finished */ 321 spin_lock_irq(&slave_active_lock); 322 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 323 spin_unlock_irq(&slave_active_lock); 324 udelay(10); 325 spin_lock_irq(&slave_active_lock); 326 } 327 spin_unlock_irq(&slave_active_lock); 328 mutex_lock(®ister_mutex); 329 list_del(&timeri->open_list); 330 mutex_unlock(®ister_mutex); 331 } else { 332 timer = timeri->timer; 333 if (snd_BUG_ON(!timer)) 334 goto out; 335 /* wait, until the active callback is finished */ 336 spin_lock_irq(&timer->lock); 337 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 338 spin_unlock_irq(&timer->lock); 339 udelay(10); 340 spin_lock_irq(&timer->lock); 341 } 342 spin_unlock_irq(&timer->lock); 343 mutex_lock(®ister_mutex); 344 list_del(&timeri->open_list); 345 if (timer && list_empty(&timer->open_list_head) && 346 timer->hw.close) 347 timer->hw.close(timer); 348 /* remove slave links */ 349 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 350 open_list) { 351 spin_lock_irq(&slave_active_lock); 352 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 353 list_move_tail(&slave->open_list, &snd_timer_slave_list); 354 slave->master = NULL; 355 slave->timer = NULL; 356 spin_unlock_irq(&slave_active_lock); 357 } 358 mutex_unlock(®ister_mutex); 359 } 360 out: 361 if (timeri->private_free) 362 timeri->private_free(timeri); 363 kfree(timeri->owner); 364 kfree(timeri); 365 if (timer) 366 module_put(timer->module); 367 return 0; 368 } 369 370 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 371 { 372 struct snd_timer * timer; 373 374 if (timeri == NULL) 375 return 0; 376 if ((timer = timeri->timer) != NULL) { 377 if (timer->hw.c_resolution) 378 return timer->hw.c_resolution(timer); 379 return timer->hw.resolution; 380 } 381 return 0; 382 } 383 384 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 385 { 386 struct snd_timer *timer; 387 unsigned long flags; 388 unsigned long resolution = 0; 389 struct snd_timer_instance *ts; 390 struct timespec tstamp; 391 392 if (timer_tstamp_monotonic) 393 ktime_get_ts(&tstamp); 394 else 395 getnstimeofday(&tstamp); 396 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 397 event > SNDRV_TIMER_EVENT_PAUSE)) 398 return; 399 if (event == SNDRV_TIMER_EVENT_START || 400 event == SNDRV_TIMER_EVENT_CONTINUE) 401 resolution = snd_timer_resolution(ti); 402 if (ti->ccallback) 403 ti->ccallback(ti, event, &tstamp, resolution); 404 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 405 return; 406 timer = ti->timer; 407 if (timer == NULL) 408 return; 409 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 410 return; 411 spin_lock_irqsave(&timer->lock, flags); 412 list_for_each_entry(ts, &ti->slave_active_head, active_list) 413 if (ts->ccallback) 414 ts->ccallback(ti, event + 100, &tstamp, resolution); 415 spin_unlock_irqrestore(&timer->lock, flags); 416 } 417 418 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 419 unsigned long sticks) 420 { 421 list_move_tail(&timeri->active_list, &timer->active_list_head); 422 if (timer->running) { 423 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 424 goto __start_now; 425 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 426 timeri->flags |= SNDRV_TIMER_IFLG_START; 427 return 1; /* delayed start */ 428 } else { 429 timer->sticks = sticks; 430 timer->hw.start(timer); 431 __start_now: 432 timer->running++; 433 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 434 return 0; 435 } 436 } 437 438 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 439 { 440 unsigned long flags; 441 442 spin_lock_irqsave(&slave_active_lock, flags); 443 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 444 if (timeri->master) 445 list_add_tail(&timeri->active_list, 446 &timeri->master->slave_active_head); 447 spin_unlock_irqrestore(&slave_active_lock, flags); 448 return 1; /* delayed start */ 449 } 450 451 /* 452 * start the timer instance 453 */ 454 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 455 { 456 struct snd_timer *timer; 457 int result = -EINVAL; 458 unsigned long flags; 459 460 if (timeri == NULL || ticks < 1) 461 return -EINVAL; 462 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 463 result = snd_timer_start_slave(timeri); 464 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 465 return result; 466 } 467 timer = timeri->timer; 468 if (timer == NULL) 469 return -EINVAL; 470 spin_lock_irqsave(&timer->lock, flags); 471 timeri->ticks = timeri->cticks = ticks; 472 timeri->pticks = 0; 473 result = snd_timer_start1(timer, timeri, ticks); 474 spin_unlock_irqrestore(&timer->lock, flags); 475 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 476 return result; 477 } 478 479 static int _snd_timer_stop(struct snd_timer_instance * timeri, 480 int keep_flag, int event) 481 { 482 struct snd_timer *timer; 483 unsigned long flags; 484 485 if (snd_BUG_ON(!timeri)) 486 return -ENXIO; 487 488 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 489 if (!keep_flag) { 490 spin_lock_irqsave(&slave_active_lock, flags); 491 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 492 spin_unlock_irqrestore(&slave_active_lock, flags); 493 } 494 goto __end; 495 } 496 timer = timeri->timer; 497 if (!timer) 498 return -EINVAL; 499 spin_lock_irqsave(&timer->lock, flags); 500 list_del_init(&timeri->ack_list); 501 list_del_init(&timeri->active_list); 502 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 503 !(--timer->running)) { 504 timer->hw.stop(timer); 505 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 506 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 507 snd_timer_reschedule(timer, 0); 508 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 509 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 510 timer->hw.start(timer); 511 } 512 } 513 } 514 if (!keep_flag) 515 timeri->flags &= 516 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 517 spin_unlock_irqrestore(&timer->lock, flags); 518 __end: 519 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 520 snd_timer_notify1(timeri, event); 521 return 0; 522 } 523 524 /* 525 * stop the timer instance. 526 * 527 * do not call this from the timer callback! 528 */ 529 int snd_timer_stop(struct snd_timer_instance *timeri) 530 { 531 struct snd_timer *timer; 532 unsigned long flags; 533 int err; 534 535 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 536 if (err < 0) 537 return err; 538 timer = timeri->timer; 539 if (!timer) 540 return -EINVAL; 541 spin_lock_irqsave(&timer->lock, flags); 542 timeri->cticks = timeri->ticks; 543 timeri->pticks = 0; 544 spin_unlock_irqrestore(&timer->lock, flags); 545 return 0; 546 } 547 548 /* 549 * start again.. the tick is kept. 550 */ 551 int snd_timer_continue(struct snd_timer_instance *timeri) 552 { 553 struct snd_timer *timer; 554 int result = -EINVAL; 555 unsigned long flags; 556 557 if (timeri == NULL) 558 return result; 559 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 560 return snd_timer_start_slave(timeri); 561 timer = timeri->timer; 562 if (! timer) 563 return -EINVAL; 564 spin_lock_irqsave(&timer->lock, flags); 565 if (!timeri->cticks) 566 timeri->cticks = 1; 567 timeri->pticks = 0; 568 result = snd_timer_start1(timer, timeri, timer->sticks); 569 spin_unlock_irqrestore(&timer->lock, flags); 570 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 571 return result; 572 } 573 574 /* 575 * pause.. remember the ticks left 576 */ 577 int snd_timer_pause(struct snd_timer_instance * timeri) 578 { 579 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 580 } 581 582 /* 583 * reschedule the timer 584 * 585 * start pending instances and check the scheduling ticks. 586 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 587 */ 588 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 589 { 590 struct snd_timer_instance *ti; 591 unsigned long ticks = ~0UL; 592 593 list_for_each_entry(ti, &timer->active_list_head, active_list) { 594 if (ti->flags & SNDRV_TIMER_IFLG_START) { 595 ti->flags &= ~SNDRV_TIMER_IFLG_START; 596 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 597 timer->running++; 598 } 599 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 600 if (ticks > ti->cticks) 601 ticks = ti->cticks; 602 } 603 } 604 if (ticks == ~0UL) { 605 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 606 return; 607 } 608 if (ticks > timer->hw.ticks) 609 ticks = timer->hw.ticks; 610 if (ticks_left != ticks) 611 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 612 timer->sticks = ticks; 613 } 614 615 /* 616 * timer tasklet 617 * 618 */ 619 static void snd_timer_tasklet(unsigned long arg) 620 { 621 struct snd_timer *timer = (struct snd_timer *) arg; 622 struct snd_timer_instance *ti; 623 struct list_head *p; 624 unsigned long resolution, ticks; 625 unsigned long flags; 626 627 spin_lock_irqsave(&timer->lock, flags); 628 /* now process all callbacks */ 629 while (!list_empty(&timer->sack_list_head)) { 630 p = timer->sack_list_head.next; /* get first item */ 631 ti = list_entry(p, struct snd_timer_instance, ack_list); 632 633 /* remove from ack_list and make empty */ 634 list_del_init(p); 635 636 ticks = ti->pticks; 637 ti->pticks = 0; 638 resolution = ti->resolution; 639 640 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 641 spin_unlock(&timer->lock); 642 if (ti->callback) 643 ti->callback(ti, resolution, ticks); 644 spin_lock(&timer->lock); 645 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 646 } 647 spin_unlock_irqrestore(&timer->lock, flags); 648 } 649 650 /* 651 * timer interrupt 652 * 653 * ticks_left is usually equal to timer->sticks. 654 * 655 */ 656 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 657 { 658 struct snd_timer_instance *ti, *ts, *tmp; 659 unsigned long resolution, ticks; 660 struct list_head *p, *ack_list_head; 661 unsigned long flags; 662 int use_tasklet = 0; 663 664 if (timer == NULL) 665 return; 666 667 spin_lock_irqsave(&timer->lock, flags); 668 669 /* remember the current resolution */ 670 if (timer->hw.c_resolution) 671 resolution = timer->hw.c_resolution(timer); 672 else 673 resolution = timer->hw.resolution; 674 675 /* loop for all active instances 676 * Here we cannot use list_for_each_entry because the active_list of a 677 * processed instance is relinked to done_list_head before the callback 678 * is called. 679 */ 680 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 681 active_list) { 682 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 683 continue; 684 ti->pticks += ticks_left; 685 ti->resolution = resolution; 686 if (ti->cticks < ticks_left) 687 ti->cticks = 0; 688 else 689 ti->cticks -= ticks_left; 690 if (ti->cticks) /* not expired */ 691 continue; 692 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 693 ti->cticks = ti->ticks; 694 } else { 695 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 696 if (--timer->running) 697 list_del(&ti->active_list); 698 } 699 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 700 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 701 ack_list_head = &timer->ack_list_head; 702 else 703 ack_list_head = &timer->sack_list_head; 704 if (list_empty(&ti->ack_list)) 705 list_add_tail(&ti->ack_list, ack_list_head); 706 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 707 ts->pticks = ti->pticks; 708 ts->resolution = resolution; 709 if (list_empty(&ts->ack_list)) 710 list_add_tail(&ts->ack_list, ack_list_head); 711 } 712 } 713 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 714 snd_timer_reschedule(timer, timer->sticks); 715 if (timer->running) { 716 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 717 timer->hw.stop(timer); 718 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 719 } 720 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 721 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 722 /* restart timer */ 723 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 724 timer->hw.start(timer); 725 } 726 } else { 727 timer->hw.stop(timer); 728 } 729 730 /* now process all fast callbacks */ 731 while (!list_empty(&timer->ack_list_head)) { 732 p = timer->ack_list_head.next; /* get first item */ 733 ti = list_entry(p, struct snd_timer_instance, ack_list); 734 735 /* remove from ack_list and make empty */ 736 list_del_init(p); 737 738 ticks = ti->pticks; 739 ti->pticks = 0; 740 741 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 742 spin_unlock(&timer->lock); 743 if (ti->callback) 744 ti->callback(ti, resolution, ticks); 745 spin_lock(&timer->lock); 746 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 747 } 748 749 /* do we have any slow callbacks? */ 750 use_tasklet = !list_empty(&timer->sack_list_head); 751 spin_unlock_irqrestore(&timer->lock, flags); 752 753 if (use_tasklet) 754 tasklet_schedule(&timer->task_queue); 755 } 756 757 /* 758 759 */ 760 761 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 762 struct snd_timer **rtimer) 763 { 764 struct snd_timer *timer; 765 int err; 766 static struct snd_device_ops ops = { 767 .dev_free = snd_timer_dev_free, 768 .dev_register = snd_timer_dev_register, 769 .dev_disconnect = snd_timer_dev_disconnect, 770 }; 771 772 if (snd_BUG_ON(!tid)) 773 return -EINVAL; 774 if (rtimer) 775 *rtimer = NULL; 776 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 777 if (timer == NULL) { 778 pr_err("ALSA: timer: cannot allocate\n"); 779 return -ENOMEM; 780 } 781 timer->tmr_class = tid->dev_class; 782 timer->card = card; 783 timer->tmr_device = tid->device; 784 timer->tmr_subdevice = tid->subdevice; 785 if (id) 786 strlcpy(timer->id, id, sizeof(timer->id)); 787 INIT_LIST_HEAD(&timer->device_list); 788 INIT_LIST_HEAD(&timer->open_list_head); 789 INIT_LIST_HEAD(&timer->active_list_head); 790 INIT_LIST_HEAD(&timer->ack_list_head); 791 INIT_LIST_HEAD(&timer->sack_list_head); 792 spin_lock_init(&timer->lock); 793 tasklet_init(&timer->task_queue, snd_timer_tasklet, 794 (unsigned long)timer); 795 if (card != NULL) { 796 timer->module = card->module; 797 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 798 if (err < 0) { 799 snd_timer_free(timer); 800 return err; 801 } 802 } 803 if (rtimer) 804 *rtimer = timer; 805 return 0; 806 } 807 808 static int snd_timer_free(struct snd_timer *timer) 809 { 810 if (!timer) 811 return 0; 812 813 mutex_lock(®ister_mutex); 814 if (! list_empty(&timer->open_list_head)) { 815 struct list_head *p, *n; 816 struct snd_timer_instance *ti; 817 pr_warn("ALSA: timer %p is busy?\n", timer); 818 list_for_each_safe(p, n, &timer->open_list_head) { 819 list_del_init(p); 820 ti = list_entry(p, struct snd_timer_instance, open_list); 821 ti->timer = NULL; 822 } 823 } 824 list_del(&timer->device_list); 825 mutex_unlock(®ister_mutex); 826 827 if (timer->private_free) 828 timer->private_free(timer); 829 kfree(timer); 830 return 0; 831 } 832 833 static int snd_timer_dev_free(struct snd_device *device) 834 { 835 struct snd_timer *timer = device->device_data; 836 return snd_timer_free(timer); 837 } 838 839 static int snd_timer_dev_register(struct snd_device *dev) 840 { 841 struct snd_timer *timer = dev->device_data; 842 struct snd_timer *timer1; 843 844 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 845 return -ENXIO; 846 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 847 !timer->hw.resolution && timer->hw.c_resolution == NULL) 848 return -EINVAL; 849 850 mutex_lock(®ister_mutex); 851 list_for_each_entry(timer1, &snd_timer_list, device_list) { 852 if (timer1->tmr_class > timer->tmr_class) 853 break; 854 if (timer1->tmr_class < timer->tmr_class) 855 continue; 856 if (timer1->card && timer->card) { 857 if (timer1->card->number > timer->card->number) 858 break; 859 if (timer1->card->number < timer->card->number) 860 continue; 861 } 862 if (timer1->tmr_device > timer->tmr_device) 863 break; 864 if (timer1->tmr_device < timer->tmr_device) 865 continue; 866 if (timer1->tmr_subdevice > timer->tmr_subdevice) 867 break; 868 if (timer1->tmr_subdevice < timer->tmr_subdevice) 869 continue; 870 /* conflicts.. */ 871 mutex_unlock(®ister_mutex); 872 return -EBUSY; 873 } 874 list_add_tail(&timer->device_list, &timer1->device_list); 875 mutex_unlock(®ister_mutex); 876 return 0; 877 } 878 879 static int snd_timer_dev_disconnect(struct snd_device *device) 880 { 881 struct snd_timer *timer = device->device_data; 882 mutex_lock(®ister_mutex); 883 list_del_init(&timer->device_list); 884 mutex_unlock(®ister_mutex); 885 return 0; 886 } 887 888 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 889 { 890 unsigned long flags; 891 unsigned long resolution = 0; 892 struct snd_timer_instance *ti, *ts; 893 894 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 895 return; 896 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 897 event > SNDRV_TIMER_EVENT_MRESUME)) 898 return; 899 spin_lock_irqsave(&timer->lock, flags); 900 if (event == SNDRV_TIMER_EVENT_MSTART || 901 event == SNDRV_TIMER_EVENT_MCONTINUE || 902 event == SNDRV_TIMER_EVENT_MRESUME) { 903 if (timer->hw.c_resolution) 904 resolution = timer->hw.c_resolution(timer); 905 else 906 resolution = timer->hw.resolution; 907 } 908 list_for_each_entry(ti, &timer->active_list_head, active_list) { 909 if (ti->ccallback) 910 ti->ccallback(ti, event, tstamp, resolution); 911 list_for_each_entry(ts, &ti->slave_active_head, active_list) 912 if (ts->ccallback) 913 ts->ccallback(ts, event, tstamp, resolution); 914 } 915 spin_unlock_irqrestore(&timer->lock, flags); 916 } 917 918 /* 919 * exported functions for global timers 920 */ 921 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 922 { 923 struct snd_timer_id tid; 924 925 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 926 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 927 tid.card = -1; 928 tid.device = device; 929 tid.subdevice = 0; 930 return snd_timer_new(NULL, id, &tid, rtimer); 931 } 932 933 int snd_timer_global_free(struct snd_timer *timer) 934 { 935 return snd_timer_free(timer); 936 } 937 938 int snd_timer_global_register(struct snd_timer *timer) 939 { 940 struct snd_device dev; 941 942 memset(&dev, 0, sizeof(dev)); 943 dev.device_data = timer; 944 return snd_timer_dev_register(&dev); 945 } 946 947 /* 948 * System timer 949 */ 950 951 struct snd_timer_system_private { 952 struct timer_list tlist; 953 unsigned long last_expires; 954 unsigned long last_jiffies; 955 unsigned long correction; 956 }; 957 958 static void snd_timer_s_function(unsigned long data) 959 { 960 struct snd_timer *timer = (struct snd_timer *)data; 961 struct snd_timer_system_private *priv = timer->private_data; 962 unsigned long jiff = jiffies; 963 if (time_after(jiff, priv->last_expires)) 964 priv->correction += (long)jiff - (long)priv->last_expires; 965 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 966 } 967 968 static int snd_timer_s_start(struct snd_timer * timer) 969 { 970 struct snd_timer_system_private *priv; 971 unsigned long njiff; 972 973 priv = (struct snd_timer_system_private *) timer->private_data; 974 njiff = (priv->last_jiffies = jiffies); 975 if (priv->correction > timer->sticks - 1) { 976 priv->correction -= timer->sticks - 1; 977 njiff++; 978 } else { 979 njiff += timer->sticks - priv->correction; 980 priv->correction = 0; 981 } 982 priv->last_expires = priv->tlist.expires = njiff; 983 add_timer(&priv->tlist); 984 return 0; 985 } 986 987 static int snd_timer_s_stop(struct snd_timer * timer) 988 { 989 struct snd_timer_system_private *priv; 990 unsigned long jiff; 991 992 priv = (struct snd_timer_system_private *) timer->private_data; 993 del_timer(&priv->tlist); 994 jiff = jiffies; 995 if (time_before(jiff, priv->last_expires)) 996 timer->sticks = priv->last_expires - jiff; 997 else 998 timer->sticks = 1; 999 priv->correction = 0; 1000 return 0; 1001 } 1002 1003 static struct snd_timer_hardware snd_timer_system = 1004 { 1005 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1006 .resolution = 1000000000L / HZ, 1007 .ticks = 10000000L, 1008 .start = snd_timer_s_start, 1009 .stop = snd_timer_s_stop 1010 }; 1011 1012 static void snd_timer_free_system(struct snd_timer *timer) 1013 { 1014 kfree(timer->private_data); 1015 } 1016 1017 static int snd_timer_register_system(void) 1018 { 1019 struct snd_timer *timer; 1020 struct snd_timer_system_private *priv; 1021 int err; 1022 1023 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1024 if (err < 0) 1025 return err; 1026 strcpy(timer->name, "system timer"); 1027 timer->hw = snd_timer_system; 1028 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1029 if (priv == NULL) { 1030 snd_timer_free(timer); 1031 return -ENOMEM; 1032 } 1033 setup_timer(&priv->tlist, snd_timer_s_function, (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 ktime_get_ts(&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 pr_err("ALSA: unable to register system timer (%i)\n", err); 1958 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1959 &snd_timer_f_ops, NULL, "timer")) < 0) 1960 pr_err("ALSA: unable to register timer device (%i)\n", err); 1961 snd_timer_proc_init(); 1962 return 0; 1963 } 1964 1965 static void __exit alsa_timer_exit(void) 1966 { 1967 struct list_head *p, *n; 1968 1969 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1970 /* unregister the system timer */ 1971 list_for_each_safe(p, n, &snd_timer_list) { 1972 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1973 snd_timer_free(timer); 1974 } 1975 snd_timer_proc_done(); 1976 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1977 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1978 #endif 1979 } 1980 1981 module_init(alsa_timer_init) 1982 module_exit(alsa_timer_exit) 1983 1984 EXPORT_SYMBOL(snd_timer_open); 1985 EXPORT_SYMBOL(snd_timer_close); 1986 EXPORT_SYMBOL(snd_timer_resolution); 1987 EXPORT_SYMBOL(snd_timer_start); 1988 EXPORT_SYMBOL(snd_timer_stop); 1989 EXPORT_SYMBOL(snd_timer_continue); 1990 EXPORT_SYMBOL(snd_timer_pause); 1991 EXPORT_SYMBOL(snd_timer_new); 1992 EXPORT_SYMBOL(snd_timer_notify); 1993 EXPORT_SYMBOL(snd_timer_global_new); 1994 EXPORT_SYMBOL(snd_timer_global_free); 1995 EXPORT_SYMBOL(snd_timer_global_register); 1996 EXPORT_SYMBOL(snd_timer_interrupt); 1997