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_HPET) || defined(CONFIG_SND_HPET_MODULE) 38 #define DEFAULT_TIMER_LIMIT 3 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 struct snd_timer_user { 56 struct snd_timer_instance *timeri; 57 int tread; /* enhanced read with timestamps and events */ 58 unsigned long ticks; 59 unsigned long overrun; 60 int qhead; 61 int qtail; 62 int qused; 63 int queue_size; 64 struct snd_timer_read *queue; 65 struct snd_timer_tread *tqueue; 66 spinlock_t qlock; 67 unsigned long last_resolution; 68 unsigned int filter; 69 struct timespec tstamp; /* trigger tstamp */ 70 wait_queue_head_t qchange_sleep; 71 struct fasync_struct *fasync; 72 struct mutex tread_sem; 73 }; 74 75 /* list of timers */ 76 static LIST_HEAD(snd_timer_list); 77 78 /* list of slave instances */ 79 static LIST_HEAD(snd_timer_slave_list); 80 81 /* lock for slave active lists */ 82 static DEFINE_SPINLOCK(slave_active_lock); 83 84 static DEFINE_MUTEX(register_mutex); 85 86 static int snd_timer_free(struct snd_timer *timer); 87 static int snd_timer_dev_free(struct snd_device *device); 88 static int snd_timer_dev_register(struct snd_device *device); 89 static int snd_timer_dev_disconnect(struct snd_device *device); 90 91 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 92 93 /* 94 * create a timer instance with the given owner string. 95 * when timer is not NULL, increments the module counter 96 */ 97 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 98 struct snd_timer *timer) 99 { 100 struct snd_timer_instance *timeri; 101 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 102 if (timeri == NULL) 103 return NULL; 104 timeri->owner = kstrdup(owner, GFP_KERNEL); 105 if (! timeri->owner) { 106 kfree(timeri); 107 return NULL; 108 } 109 INIT_LIST_HEAD(&timeri->open_list); 110 INIT_LIST_HEAD(&timeri->active_list); 111 INIT_LIST_HEAD(&timeri->ack_list); 112 INIT_LIST_HEAD(&timeri->slave_list_head); 113 INIT_LIST_HEAD(&timeri->slave_active_head); 114 115 timeri->timer = timer; 116 if (timer && !try_module_get(timer->module)) { 117 kfree(timeri->owner); 118 kfree(timeri); 119 return NULL; 120 } 121 122 return timeri; 123 } 124 125 /* 126 * find a timer instance from the given timer id 127 */ 128 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 129 { 130 struct snd_timer *timer = NULL; 131 132 list_for_each_entry(timer, &snd_timer_list, device_list) { 133 if (timer->tmr_class != tid->dev_class) 134 continue; 135 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 136 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 137 (timer->card == NULL || 138 timer->card->number != tid->card)) 139 continue; 140 if (timer->tmr_device != tid->device) 141 continue; 142 if (timer->tmr_subdevice != tid->subdevice) 143 continue; 144 return timer; 145 } 146 return NULL; 147 } 148 149 #ifdef CONFIG_KMOD 150 151 static void snd_timer_request(struct snd_timer_id *tid) 152 { 153 switch (tid->dev_class) { 154 case SNDRV_TIMER_CLASS_GLOBAL: 155 if (tid->device < timer_limit) 156 request_module("snd-timer-%i", tid->device); 157 break; 158 case SNDRV_TIMER_CLASS_CARD: 159 case SNDRV_TIMER_CLASS_PCM: 160 if (tid->card < snd_ecards_limit) 161 request_module("snd-card-%i", tid->card); 162 break; 163 default: 164 break; 165 } 166 } 167 168 #endif 169 170 /* 171 * look for a master instance matching with the slave id of the given slave. 172 * when found, relink the open_link of the slave. 173 * 174 * call this with register_mutex down. 175 */ 176 static void snd_timer_check_slave(struct snd_timer_instance *slave) 177 { 178 struct snd_timer *timer; 179 struct snd_timer_instance *master; 180 181 /* FIXME: it's really dumb to look up all entries.. */ 182 list_for_each_entry(timer, &snd_timer_list, device_list) { 183 list_for_each_entry(master, &timer->open_list_head, open_list) { 184 if (slave->slave_class == master->slave_class && 185 slave->slave_id == master->slave_id) { 186 list_del(&slave->open_list); 187 list_add_tail(&slave->open_list, 188 &master->slave_list_head); 189 spin_lock_irq(&slave_active_lock); 190 slave->master = master; 191 slave->timer = master->timer; 192 spin_unlock_irq(&slave_active_lock); 193 return; 194 } 195 } 196 } 197 } 198 199 /* 200 * look for slave instances matching with the slave id of the given master. 201 * when found, relink the open_link of slaves. 202 * 203 * call this with register_mutex down. 204 */ 205 static void snd_timer_check_master(struct snd_timer_instance *master) 206 { 207 struct snd_timer_instance *slave, *tmp; 208 209 /* check all pending slaves */ 210 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 211 if (slave->slave_class == master->slave_class && 212 slave->slave_id == master->slave_id) { 213 list_move_tail(&slave->open_list, &master->slave_list_head); 214 spin_lock_irq(&slave_active_lock); 215 slave->master = master; 216 slave->timer = master->timer; 217 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 218 list_add_tail(&slave->active_list, 219 &master->slave_active_head); 220 spin_unlock_irq(&slave_active_lock); 221 } 222 } 223 } 224 225 /* 226 * open a timer instance 227 * when opening a master, the slave id must be here given. 228 */ 229 int snd_timer_open(struct snd_timer_instance **ti, 230 char *owner, struct snd_timer_id *tid, 231 unsigned int slave_id) 232 { 233 struct snd_timer *timer; 234 struct snd_timer_instance *timeri = NULL; 235 236 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 237 /* open a slave instance */ 238 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 239 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 240 snd_printd("invalid slave class %i\n", tid->dev_sclass); 241 return -EINVAL; 242 } 243 mutex_lock(®ister_mutex); 244 timeri = snd_timer_instance_new(owner, NULL); 245 if (!timeri) { 246 mutex_unlock(®ister_mutex); 247 return -ENOMEM; 248 } 249 timeri->slave_class = tid->dev_sclass; 250 timeri->slave_id = tid->device; 251 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 252 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 253 snd_timer_check_slave(timeri); 254 mutex_unlock(®ister_mutex); 255 *ti = timeri; 256 return 0; 257 } 258 259 /* open a master instance */ 260 mutex_lock(®ister_mutex); 261 timer = snd_timer_find(tid); 262 #ifdef CONFIG_KMOD 263 if (timer == NULL) { 264 mutex_unlock(®ister_mutex); 265 snd_timer_request(tid); 266 mutex_lock(®ister_mutex); 267 timer = snd_timer_find(tid); 268 } 269 #endif 270 if (!timer) { 271 mutex_unlock(®ister_mutex); 272 return -ENODEV; 273 } 274 if (!list_empty(&timer->open_list_head)) { 275 timeri = list_entry(timer->open_list_head.next, 276 struct snd_timer_instance, open_list); 277 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 278 mutex_unlock(®ister_mutex); 279 return -EBUSY; 280 } 281 } 282 timeri = snd_timer_instance_new(owner, timer); 283 if (!timeri) { 284 mutex_unlock(®ister_mutex); 285 return -ENOMEM; 286 } 287 timeri->slave_class = tid->dev_sclass; 288 timeri->slave_id = slave_id; 289 if (list_empty(&timer->open_list_head) && timer->hw.open) 290 timer->hw.open(timer); 291 list_add_tail(&timeri->open_list, &timer->open_list_head); 292 snd_timer_check_master(timeri); 293 mutex_unlock(®ister_mutex); 294 *ti = timeri; 295 return 0; 296 } 297 298 static int _snd_timer_stop(struct snd_timer_instance *timeri, 299 int keep_flag, int event); 300 301 /* 302 * close a timer instance 303 */ 304 int snd_timer_close(struct snd_timer_instance *timeri) 305 { 306 struct snd_timer *timer = NULL; 307 struct snd_timer_instance *slave, *tmp; 308 309 snd_assert(timeri != NULL, return -ENXIO); 310 311 /* force to stop the timer */ 312 snd_timer_stop(timeri); 313 314 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 315 /* wait, until the active callback is finished */ 316 spin_lock_irq(&slave_active_lock); 317 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 318 spin_unlock_irq(&slave_active_lock); 319 udelay(10); 320 spin_lock_irq(&slave_active_lock); 321 } 322 spin_unlock_irq(&slave_active_lock); 323 mutex_lock(®ister_mutex); 324 list_del(&timeri->open_list); 325 mutex_unlock(®ister_mutex); 326 } else { 327 timer = timeri->timer; 328 /* wait, until the active callback is finished */ 329 spin_lock_irq(&timer->lock); 330 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 331 spin_unlock_irq(&timer->lock); 332 udelay(10); 333 spin_lock_irq(&timer->lock); 334 } 335 spin_unlock_irq(&timer->lock); 336 mutex_lock(®ister_mutex); 337 list_del(&timeri->open_list); 338 if (timer && list_empty(&timer->open_list_head) && 339 timer->hw.close) 340 timer->hw.close(timer); 341 /* remove slave links */ 342 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 343 open_list) { 344 spin_lock_irq(&slave_active_lock); 345 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 346 list_move_tail(&slave->open_list, &snd_timer_slave_list); 347 slave->master = NULL; 348 slave->timer = NULL; 349 spin_unlock_irq(&slave_active_lock); 350 } 351 mutex_unlock(®ister_mutex); 352 } 353 if (timeri->private_free) 354 timeri->private_free(timeri); 355 kfree(timeri->owner); 356 kfree(timeri); 357 if (timer) 358 module_put(timer->module); 359 return 0; 360 } 361 362 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 363 { 364 struct snd_timer * timer; 365 366 if (timeri == NULL) 367 return 0; 368 if ((timer = timeri->timer) != NULL) { 369 if (timer->hw.c_resolution) 370 return timer->hw.c_resolution(timer); 371 return timer->hw.resolution; 372 } 373 return 0; 374 } 375 376 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 377 { 378 struct snd_timer *timer; 379 unsigned long flags; 380 unsigned long resolution = 0; 381 struct snd_timer_instance *ts; 382 struct timespec tstamp; 383 384 if (timer_tstamp_monotonic) 385 do_posix_clock_monotonic_gettime(&tstamp); 386 else 387 getnstimeofday(&tstamp); 388 snd_assert(event >= SNDRV_TIMER_EVENT_START && 389 event <= SNDRV_TIMER_EVENT_PAUSE, return); 390 if (event == SNDRV_TIMER_EVENT_START || 391 event == SNDRV_TIMER_EVENT_CONTINUE) 392 resolution = snd_timer_resolution(ti); 393 if (ti->ccallback) 394 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); 395 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 396 return; 397 timer = ti->timer; 398 if (timer == NULL) 399 return; 400 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 401 return; 402 spin_lock_irqsave(&timer->lock, flags); 403 list_for_each_entry(ts, &ti->slave_active_head, active_list) 404 if (ts->ccallback) 405 ts->ccallback(ti, event + 100, &tstamp, resolution); 406 spin_unlock_irqrestore(&timer->lock, flags); 407 } 408 409 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 410 unsigned long sticks) 411 { 412 list_del(&timeri->active_list); 413 list_add_tail(&timeri->active_list, &timer->active_list_head); 414 if (timer->running) { 415 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 416 goto __start_now; 417 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 418 timeri->flags |= SNDRV_TIMER_IFLG_START; 419 return 1; /* delayed start */ 420 } else { 421 timer->sticks = sticks; 422 timer->hw.start(timer); 423 __start_now: 424 timer->running++; 425 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 426 return 0; 427 } 428 } 429 430 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 431 { 432 unsigned long flags; 433 434 spin_lock_irqsave(&slave_active_lock, flags); 435 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 436 if (timeri->master) 437 list_add_tail(&timeri->active_list, 438 &timeri->master->slave_active_head); 439 spin_unlock_irqrestore(&slave_active_lock, flags); 440 return 1; /* delayed start */ 441 } 442 443 /* 444 * start the timer instance 445 */ 446 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 447 { 448 struct snd_timer *timer; 449 int result = -EINVAL; 450 unsigned long flags; 451 452 if (timeri == NULL || ticks < 1) 453 return -EINVAL; 454 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 455 result = snd_timer_start_slave(timeri); 456 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 457 return result; 458 } 459 timer = timeri->timer; 460 if (timer == NULL) 461 return -EINVAL; 462 spin_lock_irqsave(&timer->lock, flags); 463 timeri->ticks = timeri->cticks = ticks; 464 timeri->pticks = 0; 465 result = snd_timer_start1(timer, timeri, ticks); 466 spin_unlock_irqrestore(&timer->lock, flags); 467 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 468 return result; 469 } 470 471 static int _snd_timer_stop(struct snd_timer_instance * timeri, 472 int keep_flag, int event) 473 { 474 struct snd_timer *timer; 475 unsigned long flags; 476 477 snd_assert(timeri != NULL, return -ENXIO); 478 479 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 480 if (!keep_flag) { 481 spin_lock_irqsave(&slave_active_lock, flags); 482 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 483 spin_unlock_irqrestore(&slave_active_lock, flags); 484 } 485 goto __end; 486 } 487 timer = timeri->timer; 488 if (!timer) 489 return -EINVAL; 490 spin_lock_irqsave(&timer->lock, flags); 491 list_del_init(&timeri->ack_list); 492 list_del_init(&timeri->active_list); 493 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 494 !(--timer->running)) { 495 timer->hw.stop(timer); 496 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 497 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 498 snd_timer_reschedule(timer, 0); 499 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 500 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 501 timer->hw.start(timer); 502 } 503 } 504 } 505 if (!keep_flag) 506 timeri->flags &= 507 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 508 spin_unlock_irqrestore(&timer->lock, flags); 509 __end: 510 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 511 snd_timer_notify1(timeri, event); 512 return 0; 513 } 514 515 /* 516 * stop the timer instance. 517 * 518 * do not call this from the timer callback! 519 */ 520 int snd_timer_stop(struct snd_timer_instance *timeri) 521 { 522 struct snd_timer *timer; 523 unsigned long flags; 524 int err; 525 526 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 527 if (err < 0) 528 return err; 529 timer = timeri->timer; 530 spin_lock_irqsave(&timer->lock, flags); 531 timeri->cticks = timeri->ticks; 532 timeri->pticks = 0; 533 spin_unlock_irqrestore(&timer->lock, flags); 534 return 0; 535 } 536 537 /* 538 * start again.. the tick is kept. 539 */ 540 int snd_timer_continue(struct snd_timer_instance *timeri) 541 { 542 struct snd_timer *timer; 543 int result = -EINVAL; 544 unsigned long flags; 545 546 if (timeri == NULL) 547 return result; 548 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 549 return snd_timer_start_slave(timeri); 550 timer = timeri->timer; 551 if (! timer) 552 return -EINVAL; 553 spin_lock_irqsave(&timer->lock, flags); 554 if (!timeri->cticks) 555 timeri->cticks = 1; 556 timeri->pticks = 0; 557 result = snd_timer_start1(timer, timeri, timer->sticks); 558 spin_unlock_irqrestore(&timer->lock, flags); 559 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 560 return result; 561 } 562 563 /* 564 * pause.. remember the ticks left 565 */ 566 int snd_timer_pause(struct snd_timer_instance * timeri) 567 { 568 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 569 } 570 571 /* 572 * reschedule the timer 573 * 574 * start pending instances and check the scheduling ticks. 575 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 576 */ 577 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 578 { 579 struct snd_timer_instance *ti; 580 unsigned long ticks = ~0UL; 581 582 list_for_each_entry(ti, &timer->active_list_head, active_list) { 583 if (ti->flags & SNDRV_TIMER_IFLG_START) { 584 ti->flags &= ~SNDRV_TIMER_IFLG_START; 585 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 586 timer->running++; 587 } 588 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 589 if (ticks > ti->cticks) 590 ticks = ti->cticks; 591 } 592 } 593 if (ticks == ~0UL) { 594 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 595 return; 596 } 597 if (ticks > timer->hw.ticks) 598 ticks = timer->hw.ticks; 599 if (ticks_left != ticks) 600 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 601 timer->sticks = ticks; 602 } 603 604 /* 605 * timer tasklet 606 * 607 */ 608 static void snd_timer_tasklet(unsigned long arg) 609 { 610 struct snd_timer *timer = (struct snd_timer *) arg; 611 struct snd_timer_instance *ti; 612 struct list_head *p; 613 unsigned long resolution, ticks; 614 unsigned long flags; 615 616 spin_lock_irqsave(&timer->lock, flags); 617 /* now process all callbacks */ 618 while (!list_empty(&timer->sack_list_head)) { 619 p = timer->sack_list_head.next; /* get first item */ 620 ti = list_entry(p, struct snd_timer_instance, ack_list); 621 622 /* remove from ack_list and make empty */ 623 list_del_init(p); 624 625 ticks = ti->pticks; 626 ti->pticks = 0; 627 resolution = ti->resolution; 628 629 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 630 spin_unlock(&timer->lock); 631 if (ti->callback) 632 ti->callback(ti, resolution, ticks); 633 spin_lock(&timer->lock); 634 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 635 } 636 spin_unlock_irqrestore(&timer->lock, flags); 637 } 638 639 /* 640 * timer interrupt 641 * 642 * ticks_left is usually equal to timer->sticks. 643 * 644 */ 645 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 646 { 647 struct snd_timer_instance *ti, *ts, *tmp; 648 unsigned long resolution, ticks; 649 struct list_head *p, *ack_list_head; 650 unsigned long flags; 651 int use_tasklet = 0; 652 653 if (timer == NULL) 654 return; 655 656 spin_lock_irqsave(&timer->lock, flags); 657 658 /* remember the current resolution */ 659 if (timer->hw.c_resolution) 660 resolution = timer->hw.c_resolution(timer); 661 else 662 resolution = timer->hw.resolution; 663 664 /* loop for all active instances 665 * Here we cannot use list_for_each_entry because the active_list of a 666 * processed instance is relinked to done_list_head before the callback 667 * is called. 668 */ 669 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 670 active_list) { 671 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 672 continue; 673 ti->pticks += ticks_left; 674 ti->resolution = resolution; 675 if (ti->cticks < ticks_left) 676 ti->cticks = 0; 677 else 678 ti->cticks -= ticks_left; 679 if (ti->cticks) /* not expired */ 680 continue; 681 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 682 ti->cticks = ti->ticks; 683 } else { 684 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 685 if (--timer->running) 686 list_del(&ti->active_list); 687 } 688 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 689 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 690 ack_list_head = &timer->ack_list_head; 691 else 692 ack_list_head = &timer->sack_list_head; 693 if (list_empty(&ti->ack_list)) 694 list_add_tail(&ti->ack_list, ack_list_head); 695 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 696 ts->pticks = ti->pticks; 697 ts->resolution = resolution; 698 if (list_empty(&ts->ack_list)) 699 list_add_tail(&ts->ack_list, ack_list_head); 700 } 701 } 702 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 703 snd_timer_reschedule(timer, timer->sticks); 704 if (timer->running) { 705 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 706 timer->hw.stop(timer); 707 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 708 } 709 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 710 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 711 /* restart timer */ 712 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 713 timer->hw.start(timer); 714 } 715 } else { 716 timer->hw.stop(timer); 717 } 718 719 /* now process all fast callbacks */ 720 while (!list_empty(&timer->ack_list_head)) { 721 p = timer->ack_list_head.next; /* get first item */ 722 ti = list_entry(p, struct snd_timer_instance, ack_list); 723 724 /* remove from ack_list and make empty */ 725 list_del_init(p); 726 727 ticks = ti->pticks; 728 ti->pticks = 0; 729 730 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 731 spin_unlock(&timer->lock); 732 if (ti->callback) 733 ti->callback(ti, resolution, ticks); 734 spin_lock(&timer->lock); 735 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 736 } 737 738 /* do we have any slow callbacks? */ 739 use_tasklet = !list_empty(&timer->sack_list_head); 740 spin_unlock_irqrestore(&timer->lock, flags); 741 742 if (use_tasklet) 743 tasklet_hi_schedule(&timer->task_queue); 744 } 745 746 /* 747 748 */ 749 750 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 751 struct snd_timer **rtimer) 752 { 753 struct snd_timer *timer; 754 int err; 755 static struct snd_device_ops ops = { 756 .dev_free = snd_timer_dev_free, 757 .dev_register = snd_timer_dev_register, 758 .dev_disconnect = snd_timer_dev_disconnect, 759 }; 760 761 snd_assert(tid != NULL, return -EINVAL); 762 snd_assert(rtimer != NULL, return -EINVAL); 763 *rtimer = NULL; 764 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 765 if (timer == NULL) { 766 snd_printk(KERN_ERR "timer: cannot allocate\n"); 767 return -ENOMEM; 768 } 769 timer->tmr_class = tid->dev_class; 770 timer->card = card; 771 timer->tmr_device = tid->device; 772 timer->tmr_subdevice = tid->subdevice; 773 if (id) 774 strlcpy(timer->id, id, sizeof(timer->id)); 775 INIT_LIST_HEAD(&timer->device_list); 776 INIT_LIST_HEAD(&timer->open_list_head); 777 INIT_LIST_HEAD(&timer->active_list_head); 778 INIT_LIST_HEAD(&timer->ack_list_head); 779 INIT_LIST_HEAD(&timer->sack_list_head); 780 spin_lock_init(&timer->lock); 781 tasklet_init(&timer->task_queue, snd_timer_tasklet, 782 (unsigned long)timer); 783 if (card != NULL) { 784 timer->module = card->module; 785 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 786 if (err < 0) { 787 snd_timer_free(timer); 788 return err; 789 } 790 } 791 *rtimer = timer; 792 return 0; 793 } 794 795 static int snd_timer_free(struct snd_timer *timer) 796 { 797 snd_assert(timer != NULL, return -ENXIO); 798 799 mutex_lock(®ister_mutex); 800 if (! list_empty(&timer->open_list_head)) { 801 struct list_head *p, *n; 802 struct snd_timer_instance *ti; 803 snd_printk(KERN_WARNING "timer %p is busy?\n", timer); 804 list_for_each_safe(p, n, &timer->open_list_head) { 805 list_del_init(p); 806 ti = list_entry(p, struct snd_timer_instance, open_list); 807 ti->timer = NULL; 808 } 809 } 810 list_del(&timer->device_list); 811 mutex_unlock(®ister_mutex); 812 813 if (timer->private_free) 814 timer->private_free(timer); 815 kfree(timer); 816 return 0; 817 } 818 819 static int snd_timer_dev_free(struct snd_device *device) 820 { 821 struct snd_timer *timer = device->device_data; 822 return snd_timer_free(timer); 823 } 824 825 static int snd_timer_dev_register(struct snd_device *dev) 826 { 827 struct snd_timer *timer = dev->device_data; 828 struct snd_timer *timer1; 829 830 snd_assert(timer != NULL && timer->hw.start != NULL && 831 timer->hw.stop != NULL, return -ENXIO); 832 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 833 !timer->hw.resolution && timer->hw.c_resolution == NULL) 834 return -EINVAL; 835 836 mutex_lock(®ister_mutex); 837 list_for_each_entry(timer1, &snd_timer_list, device_list) { 838 if (timer1->tmr_class > timer->tmr_class) 839 break; 840 if (timer1->tmr_class < timer->tmr_class) 841 continue; 842 if (timer1->card && timer->card) { 843 if (timer1->card->number > timer->card->number) 844 break; 845 if (timer1->card->number < timer->card->number) 846 continue; 847 } 848 if (timer1->tmr_device > timer->tmr_device) 849 break; 850 if (timer1->tmr_device < timer->tmr_device) 851 continue; 852 if (timer1->tmr_subdevice > timer->tmr_subdevice) 853 break; 854 if (timer1->tmr_subdevice < timer->tmr_subdevice) 855 continue; 856 /* conflicts.. */ 857 mutex_unlock(®ister_mutex); 858 return -EBUSY; 859 } 860 list_add_tail(&timer->device_list, &timer1->device_list); 861 mutex_unlock(®ister_mutex); 862 return 0; 863 } 864 865 static int snd_timer_dev_disconnect(struct snd_device *device) 866 { 867 struct snd_timer *timer = device->device_data; 868 mutex_lock(®ister_mutex); 869 list_del_init(&timer->device_list); 870 mutex_unlock(®ister_mutex); 871 return 0; 872 } 873 874 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 875 { 876 unsigned long flags; 877 unsigned long resolution = 0; 878 struct snd_timer_instance *ti, *ts; 879 880 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 881 return; 882 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && 883 event <= SNDRV_TIMER_EVENT_MRESUME, return); 884 spin_lock_irqsave(&timer->lock, flags); 885 if (event == SNDRV_TIMER_EVENT_MSTART || 886 event == SNDRV_TIMER_EVENT_MCONTINUE || 887 event == SNDRV_TIMER_EVENT_MRESUME) { 888 if (timer->hw.c_resolution) 889 resolution = timer->hw.c_resolution(timer); 890 else 891 resolution = timer->hw.resolution; 892 } 893 list_for_each_entry(ti, &timer->active_list_head, active_list) { 894 if (ti->ccallback) 895 ti->ccallback(ti, event, tstamp, resolution); 896 list_for_each_entry(ts, &ti->slave_active_head, active_list) 897 if (ts->ccallback) 898 ts->ccallback(ts, event, tstamp, resolution); 899 } 900 spin_unlock_irqrestore(&timer->lock, flags); 901 } 902 903 /* 904 * exported functions for global timers 905 */ 906 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 907 { 908 struct snd_timer_id tid; 909 910 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 911 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 912 tid.card = -1; 913 tid.device = device; 914 tid.subdevice = 0; 915 return snd_timer_new(NULL, id, &tid, rtimer); 916 } 917 918 int snd_timer_global_free(struct snd_timer *timer) 919 { 920 return snd_timer_free(timer); 921 } 922 923 int snd_timer_global_register(struct snd_timer *timer) 924 { 925 struct snd_device dev; 926 927 memset(&dev, 0, sizeof(dev)); 928 dev.device_data = timer; 929 return snd_timer_dev_register(&dev); 930 } 931 932 /* 933 * System timer 934 */ 935 936 struct snd_timer_system_private { 937 struct timer_list tlist; 938 unsigned long last_expires; 939 unsigned long last_jiffies; 940 unsigned long correction; 941 }; 942 943 static void snd_timer_s_function(unsigned long data) 944 { 945 struct snd_timer *timer = (struct snd_timer *)data; 946 struct snd_timer_system_private *priv = timer->private_data; 947 unsigned long jiff = jiffies; 948 if (time_after(jiff, priv->last_expires)) 949 priv->correction += (long)jiff - (long)priv->last_expires; 950 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 951 } 952 953 static int snd_timer_s_start(struct snd_timer * timer) 954 { 955 struct snd_timer_system_private *priv; 956 unsigned long njiff; 957 958 priv = (struct snd_timer_system_private *) timer->private_data; 959 njiff = (priv->last_jiffies = jiffies); 960 if (priv->correction > timer->sticks - 1) { 961 priv->correction -= timer->sticks - 1; 962 njiff++; 963 } else { 964 njiff += timer->sticks - priv->correction; 965 priv->correction = 0; 966 } 967 priv->last_expires = priv->tlist.expires = njiff; 968 add_timer(&priv->tlist); 969 return 0; 970 } 971 972 static int snd_timer_s_stop(struct snd_timer * timer) 973 { 974 struct snd_timer_system_private *priv; 975 unsigned long jiff; 976 977 priv = (struct snd_timer_system_private *) timer->private_data; 978 del_timer(&priv->tlist); 979 jiff = jiffies; 980 if (time_before(jiff, priv->last_expires)) 981 timer->sticks = priv->last_expires - jiff; 982 else 983 timer->sticks = 1; 984 priv->correction = 0; 985 return 0; 986 } 987 988 static struct snd_timer_hardware snd_timer_system = 989 { 990 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 991 .resolution = 1000000000L / HZ, 992 .ticks = 10000000L, 993 .start = snd_timer_s_start, 994 .stop = snd_timer_s_stop 995 }; 996 997 static void snd_timer_free_system(struct snd_timer *timer) 998 { 999 kfree(timer->private_data); 1000 } 1001 1002 static int snd_timer_register_system(void) 1003 { 1004 struct snd_timer *timer; 1005 struct snd_timer_system_private *priv; 1006 int err; 1007 1008 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1009 if (err < 0) 1010 return err; 1011 strcpy(timer->name, "system timer"); 1012 timer->hw = snd_timer_system; 1013 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1014 if (priv == NULL) { 1015 snd_timer_free(timer); 1016 return -ENOMEM; 1017 } 1018 init_timer(&priv->tlist); 1019 priv->tlist.function = snd_timer_s_function; 1020 priv->tlist.data = (unsigned long) timer; 1021 timer->private_data = priv; 1022 timer->private_free = snd_timer_free_system; 1023 return snd_timer_global_register(timer); 1024 } 1025 1026 #ifdef CONFIG_PROC_FS 1027 /* 1028 * Info interface 1029 */ 1030 1031 static void snd_timer_proc_read(struct snd_info_entry *entry, 1032 struct snd_info_buffer *buffer) 1033 { 1034 struct snd_timer *timer; 1035 struct snd_timer_instance *ti; 1036 1037 mutex_lock(®ister_mutex); 1038 list_for_each_entry(timer, &snd_timer_list, device_list) { 1039 switch (timer->tmr_class) { 1040 case SNDRV_TIMER_CLASS_GLOBAL: 1041 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1042 break; 1043 case SNDRV_TIMER_CLASS_CARD: 1044 snd_iprintf(buffer, "C%i-%i: ", 1045 timer->card->number, timer->tmr_device); 1046 break; 1047 case SNDRV_TIMER_CLASS_PCM: 1048 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1049 timer->tmr_device, timer->tmr_subdevice); 1050 break; 1051 default: 1052 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1053 timer->card ? timer->card->number : -1, 1054 timer->tmr_device, timer->tmr_subdevice); 1055 } 1056 snd_iprintf(buffer, "%s :", timer->name); 1057 if (timer->hw.resolution) 1058 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1059 timer->hw.resolution / 1000, 1060 timer->hw.resolution % 1000, 1061 timer->hw.ticks); 1062 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1063 snd_iprintf(buffer, " SLAVE"); 1064 snd_iprintf(buffer, "\n"); 1065 list_for_each_entry(ti, &timer->open_list_head, open_list) 1066 snd_iprintf(buffer, " Client %s : %s\n", 1067 ti->owner ? ti->owner : "unknown", 1068 ti->flags & (SNDRV_TIMER_IFLG_START | 1069 SNDRV_TIMER_IFLG_RUNNING) 1070 ? "running" : "stopped"); 1071 } 1072 mutex_unlock(®ister_mutex); 1073 } 1074 1075 static struct snd_info_entry *snd_timer_proc_entry; 1076 1077 static void __init snd_timer_proc_init(void) 1078 { 1079 struct snd_info_entry *entry; 1080 1081 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1082 if (entry != NULL) { 1083 entry->c.text.read = snd_timer_proc_read; 1084 if (snd_info_register(entry) < 0) { 1085 snd_info_free_entry(entry); 1086 entry = NULL; 1087 } 1088 } 1089 snd_timer_proc_entry = entry; 1090 } 1091 1092 static void __exit snd_timer_proc_done(void) 1093 { 1094 snd_info_free_entry(snd_timer_proc_entry); 1095 } 1096 #else /* !CONFIG_PROC_FS */ 1097 #define snd_timer_proc_init() 1098 #define snd_timer_proc_done() 1099 #endif 1100 1101 /* 1102 * USER SPACE interface 1103 */ 1104 1105 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1106 unsigned long resolution, 1107 unsigned long ticks) 1108 { 1109 struct snd_timer_user *tu = timeri->callback_data; 1110 struct snd_timer_read *r; 1111 int prev; 1112 1113 spin_lock(&tu->qlock); 1114 if (tu->qused > 0) { 1115 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1116 r = &tu->queue[prev]; 1117 if (r->resolution == resolution) { 1118 r->ticks += ticks; 1119 goto __wake; 1120 } 1121 } 1122 if (tu->qused >= tu->queue_size) { 1123 tu->overrun++; 1124 } else { 1125 r = &tu->queue[tu->qtail++]; 1126 tu->qtail %= tu->queue_size; 1127 r->resolution = resolution; 1128 r->ticks = ticks; 1129 tu->qused++; 1130 } 1131 __wake: 1132 spin_unlock(&tu->qlock); 1133 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1134 wake_up(&tu->qchange_sleep); 1135 } 1136 1137 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1138 struct snd_timer_tread *tread) 1139 { 1140 if (tu->qused >= tu->queue_size) { 1141 tu->overrun++; 1142 } else { 1143 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1144 tu->qtail %= tu->queue_size; 1145 tu->qused++; 1146 } 1147 } 1148 1149 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1150 int event, 1151 struct timespec *tstamp, 1152 unsigned long resolution) 1153 { 1154 struct snd_timer_user *tu = timeri->callback_data; 1155 struct snd_timer_tread r1; 1156 1157 if (event >= SNDRV_TIMER_EVENT_START && 1158 event <= SNDRV_TIMER_EVENT_PAUSE) 1159 tu->tstamp = *tstamp; 1160 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1161 return; 1162 r1.event = event; 1163 r1.tstamp = *tstamp; 1164 r1.val = resolution; 1165 spin_lock(&tu->qlock); 1166 snd_timer_user_append_to_tqueue(tu, &r1); 1167 spin_unlock(&tu->qlock); 1168 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1169 wake_up(&tu->qchange_sleep); 1170 } 1171 1172 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1173 unsigned long resolution, 1174 unsigned long ticks) 1175 { 1176 struct snd_timer_user *tu = timeri->callback_data; 1177 struct snd_timer_tread *r, r1; 1178 struct timespec tstamp; 1179 int prev, append = 0; 1180 1181 memset(&tstamp, 0, sizeof(tstamp)); 1182 spin_lock(&tu->qlock); 1183 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1184 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1185 spin_unlock(&tu->qlock); 1186 return; 1187 } 1188 if (tu->last_resolution != resolution || ticks > 0) { 1189 if (timer_tstamp_monotonic) 1190 do_posix_clock_monotonic_gettime(&tstamp); 1191 else 1192 getnstimeofday(&tstamp); 1193 } 1194 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1195 tu->last_resolution != resolution) { 1196 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1197 r1.tstamp = tstamp; 1198 r1.val = resolution; 1199 snd_timer_user_append_to_tqueue(tu, &r1); 1200 tu->last_resolution = resolution; 1201 append++; 1202 } 1203 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1204 goto __wake; 1205 if (ticks == 0) 1206 goto __wake; 1207 if (tu->qused > 0) { 1208 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1209 r = &tu->tqueue[prev]; 1210 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1211 r->tstamp = tstamp; 1212 r->val += ticks; 1213 append++; 1214 goto __wake; 1215 } 1216 } 1217 r1.event = SNDRV_TIMER_EVENT_TICK; 1218 r1.tstamp = tstamp; 1219 r1.val = ticks; 1220 snd_timer_user_append_to_tqueue(tu, &r1); 1221 append++; 1222 __wake: 1223 spin_unlock(&tu->qlock); 1224 if (append == 0) 1225 return; 1226 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1227 wake_up(&tu->qchange_sleep); 1228 } 1229 1230 static int snd_timer_user_open(struct inode *inode, struct file *file) 1231 { 1232 struct snd_timer_user *tu; 1233 1234 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1235 if (tu == NULL) 1236 return -ENOMEM; 1237 spin_lock_init(&tu->qlock); 1238 init_waitqueue_head(&tu->qchange_sleep); 1239 mutex_init(&tu->tread_sem); 1240 tu->ticks = 1; 1241 tu->queue_size = 128; 1242 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1243 GFP_KERNEL); 1244 if (tu->queue == NULL) { 1245 kfree(tu); 1246 return -ENOMEM; 1247 } 1248 file->private_data = tu; 1249 return 0; 1250 } 1251 1252 static int snd_timer_user_release(struct inode *inode, struct file *file) 1253 { 1254 struct snd_timer_user *tu; 1255 1256 if (file->private_data) { 1257 tu = file->private_data; 1258 file->private_data = NULL; 1259 fasync_helper(-1, file, 0, &tu->fasync); 1260 if (tu->timeri) 1261 snd_timer_close(tu->timeri); 1262 kfree(tu->queue); 1263 kfree(tu->tqueue); 1264 kfree(tu); 1265 } 1266 return 0; 1267 } 1268 1269 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1270 { 1271 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1272 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1273 id->card = -1; 1274 id->device = -1; 1275 id->subdevice = -1; 1276 } 1277 1278 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1279 { 1280 id->dev_class = timer->tmr_class; 1281 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1282 id->card = timer->card ? timer->card->number : -1; 1283 id->device = timer->tmr_device; 1284 id->subdevice = timer->tmr_subdevice; 1285 } 1286 1287 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1288 { 1289 struct snd_timer_id id; 1290 struct snd_timer *timer; 1291 struct list_head *p; 1292 1293 if (copy_from_user(&id, _tid, sizeof(id))) 1294 return -EFAULT; 1295 mutex_lock(®ister_mutex); 1296 if (id.dev_class < 0) { /* first item */ 1297 if (list_empty(&snd_timer_list)) 1298 snd_timer_user_zero_id(&id); 1299 else { 1300 timer = list_entry(snd_timer_list.next, 1301 struct snd_timer, device_list); 1302 snd_timer_user_copy_id(&id, timer); 1303 } 1304 } else { 1305 switch (id.dev_class) { 1306 case SNDRV_TIMER_CLASS_GLOBAL: 1307 id.device = id.device < 0 ? 0 : id.device + 1; 1308 list_for_each(p, &snd_timer_list) { 1309 timer = list_entry(p, struct snd_timer, device_list); 1310 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1311 snd_timer_user_copy_id(&id, timer); 1312 break; 1313 } 1314 if (timer->tmr_device >= id.device) { 1315 snd_timer_user_copy_id(&id, timer); 1316 break; 1317 } 1318 } 1319 if (p == &snd_timer_list) 1320 snd_timer_user_zero_id(&id); 1321 break; 1322 case SNDRV_TIMER_CLASS_CARD: 1323 case SNDRV_TIMER_CLASS_PCM: 1324 if (id.card < 0) { 1325 id.card = 0; 1326 } else { 1327 if (id.card < 0) { 1328 id.card = 0; 1329 } else { 1330 if (id.device < 0) { 1331 id.device = 0; 1332 } else { 1333 if (id.subdevice < 0) { 1334 id.subdevice = 0; 1335 } else { 1336 id.subdevice++; 1337 } 1338 } 1339 } 1340 } 1341 list_for_each(p, &snd_timer_list) { 1342 timer = list_entry(p, struct snd_timer, device_list); 1343 if (timer->tmr_class > id.dev_class) { 1344 snd_timer_user_copy_id(&id, timer); 1345 break; 1346 } 1347 if (timer->tmr_class < id.dev_class) 1348 continue; 1349 if (timer->card->number > id.card) { 1350 snd_timer_user_copy_id(&id, timer); 1351 break; 1352 } 1353 if (timer->card->number < id.card) 1354 continue; 1355 if (timer->tmr_device > id.device) { 1356 snd_timer_user_copy_id(&id, timer); 1357 break; 1358 } 1359 if (timer->tmr_device < id.device) 1360 continue; 1361 if (timer->tmr_subdevice > id.subdevice) { 1362 snd_timer_user_copy_id(&id, timer); 1363 break; 1364 } 1365 if (timer->tmr_subdevice < id.subdevice) 1366 continue; 1367 snd_timer_user_copy_id(&id, timer); 1368 break; 1369 } 1370 if (p == &snd_timer_list) 1371 snd_timer_user_zero_id(&id); 1372 break; 1373 default: 1374 snd_timer_user_zero_id(&id); 1375 } 1376 } 1377 mutex_unlock(®ister_mutex); 1378 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1379 return -EFAULT; 1380 return 0; 1381 } 1382 1383 static int snd_timer_user_ginfo(struct file *file, 1384 struct snd_timer_ginfo __user *_ginfo) 1385 { 1386 struct snd_timer_ginfo *ginfo; 1387 struct snd_timer_id tid; 1388 struct snd_timer *t; 1389 struct list_head *p; 1390 int err = 0; 1391 1392 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1393 if (! ginfo) 1394 return -ENOMEM; 1395 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1396 kfree(ginfo); 1397 return -EFAULT; 1398 } 1399 tid = ginfo->tid; 1400 memset(ginfo, 0, sizeof(*ginfo)); 1401 ginfo->tid = tid; 1402 mutex_lock(®ister_mutex); 1403 t = snd_timer_find(&tid); 1404 if (t != NULL) { 1405 ginfo->card = t->card ? t->card->number : -1; 1406 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1407 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1408 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1409 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1410 ginfo->resolution = t->hw.resolution; 1411 if (t->hw.resolution_min > 0) { 1412 ginfo->resolution_min = t->hw.resolution_min; 1413 ginfo->resolution_max = t->hw.resolution_max; 1414 } 1415 list_for_each(p, &t->open_list_head) { 1416 ginfo->clients++; 1417 } 1418 } else { 1419 err = -ENODEV; 1420 } 1421 mutex_unlock(®ister_mutex); 1422 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1423 err = -EFAULT; 1424 kfree(ginfo); 1425 return err; 1426 } 1427 1428 static int snd_timer_user_gparams(struct file *file, 1429 struct snd_timer_gparams __user *_gparams) 1430 { 1431 struct snd_timer_gparams gparams; 1432 struct snd_timer *t; 1433 int err; 1434 1435 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1436 return -EFAULT; 1437 mutex_lock(®ister_mutex); 1438 t = snd_timer_find(&gparams.tid); 1439 if (!t) { 1440 err = -ENODEV; 1441 goto _error; 1442 } 1443 if (!list_empty(&t->open_list_head)) { 1444 err = -EBUSY; 1445 goto _error; 1446 } 1447 if (!t->hw.set_period) { 1448 err = -ENOSYS; 1449 goto _error; 1450 } 1451 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1452 _error: 1453 mutex_unlock(®ister_mutex); 1454 return err; 1455 } 1456 1457 static int snd_timer_user_gstatus(struct file *file, 1458 struct snd_timer_gstatus __user *_gstatus) 1459 { 1460 struct snd_timer_gstatus gstatus; 1461 struct snd_timer_id tid; 1462 struct snd_timer *t; 1463 int err = 0; 1464 1465 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1466 return -EFAULT; 1467 tid = gstatus.tid; 1468 memset(&gstatus, 0, sizeof(gstatus)); 1469 gstatus.tid = tid; 1470 mutex_lock(®ister_mutex); 1471 t = snd_timer_find(&tid); 1472 if (t != NULL) { 1473 if (t->hw.c_resolution) 1474 gstatus.resolution = t->hw.c_resolution(t); 1475 else 1476 gstatus.resolution = t->hw.resolution; 1477 if (t->hw.precise_resolution) { 1478 t->hw.precise_resolution(t, &gstatus.resolution_num, 1479 &gstatus.resolution_den); 1480 } else { 1481 gstatus.resolution_num = gstatus.resolution; 1482 gstatus.resolution_den = 1000000000uL; 1483 } 1484 } else { 1485 err = -ENODEV; 1486 } 1487 mutex_unlock(®ister_mutex); 1488 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1489 err = -EFAULT; 1490 return err; 1491 } 1492 1493 static int snd_timer_user_tselect(struct file *file, 1494 struct snd_timer_select __user *_tselect) 1495 { 1496 struct snd_timer_user *tu; 1497 struct snd_timer_select tselect; 1498 char str[32]; 1499 int err = 0; 1500 1501 tu = file->private_data; 1502 mutex_lock(&tu->tread_sem); 1503 if (tu->timeri) { 1504 snd_timer_close(tu->timeri); 1505 tu->timeri = NULL; 1506 } 1507 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1508 err = -EFAULT; 1509 goto __err; 1510 } 1511 sprintf(str, "application %i", current->pid); 1512 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1513 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1514 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1515 if (err < 0) 1516 goto __err; 1517 1518 kfree(tu->queue); 1519 tu->queue = NULL; 1520 kfree(tu->tqueue); 1521 tu->tqueue = NULL; 1522 if (tu->tread) { 1523 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1524 GFP_KERNEL); 1525 if (tu->tqueue == NULL) 1526 err = -ENOMEM; 1527 } else { 1528 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1529 GFP_KERNEL); 1530 if (tu->queue == NULL) 1531 err = -ENOMEM; 1532 } 1533 1534 if (err < 0) { 1535 snd_timer_close(tu->timeri); 1536 tu->timeri = NULL; 1537 } else { 1538 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1539 tu->timeri->callback = tu->tread 1540 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1541 tu->timeri->ccallback = snd_timer_user_ccallback; 1542 tu->timeri->callback_data = (void *)tu; 1543 } 1544 1545 __err: 1546 mutex_unlock(&tu->tread_sem); 1547 return err; 1548 } 1549 1550 static int snd_timer_user_info(struct file *file, 1551 struct snd_timer_info __user *_info) 1552 { 1553 struct snd_timer_user *tu; 1554 struct snd_timer_info *info; 1555 struct snd_timer *t; 1556 int err = 0; 1557 1558 tu = file->private_data; 1559 if (!tu->timeri) 1560 return -EBADFD; 1561 t = tu->timeri->timer; 1562 if (!t) 1563 return -EBADFD; 1564 1565 info = kzalloc(sizeof(*info), GFP_KERNEL); 1566 if (! info) 1567 return -ENOMEM; 1568 info->card = t->card ? t->card->number : -1; 1569 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1570 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1571 strlcpy(info->id, t->id, sizeof(info->id)); 1572 strlcpy(info->name, t->name, sizeof(info->name)); 1573 info->resolution = t->hw.resolution; 1574 if (copy_to_user(_info, info, sizeof(*_info))) 1575 err = -EFAULT; 1576 kfree(info); 1577 return err; 1578 } 1579 1580 static int snd_timer_user_params(struct file *file, 1581 struct snd_timer_params __user *_params) 1582 { 1583 struct snd_timer_user *tu; 1584 struct snd_timer_params params; 1585 struct snd_timer *t; 1586 struct snd_timer_read *tr; 1587 struct snd_timer_tread *ttr; 1588 int err; 1589 1590 tu = file->private_data; 1591 if (!tu->timeri) 1592 return -EBADFD; 1593 t = tu->timeri->timer; 1594 if (!t) 1595 return -EBADFD; 1596 if (copy_from_user(¶ms, _params, sizeof(params))) 1597 return -EFAULT; 1598 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1599 err = -EINVAL; 1600 goto _end; 1601 } 1602 if (params.queue_size > 0 && 1603 (params.queue_size < 32 || params.queue_size > 1024)) { 1604 err = -EINVAL; 1605 goto _end; 1606 } 1607 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1608 (1<<SNDRV_TIMER_EVENT_TICK)| 1609 (1<<SNDRV_TIMER_EVENT_START)| 1610 (1<<SNDRV_TIMER_EVENT_STOP)| 1611 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1612 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1613 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1614 (1<<SNDRV_TIMER_EVENT_RESUME)| 1615 (1<<SNDRV_TIMER_EVENT_MSTART)| 1616 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1617 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1618 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1619 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1620 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1621 err = -EINVAL; 1622 goto _end; 1623 } 1624 snd_timer_stop(tu->timeri); 1625 spin_lock_irq(&t->lock); 1626 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1627 SNDRV_TIMER_IFLG_EXCLUSIVE| 1628 SNDRV_TIMER_IFLG_EARLY_EVENT); 1629 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1630 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1631 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1632 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1633 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1634 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1635 spin_unlock_irq(&t->lock); 1636 if (params.queue_size > 0 && 1637 (unsigned int)tu->queue_size != params.queue_size) { 1638 if (tu->tread) { 1639 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1640 GFP_KERNEL); 1641 if (ttr) { 1642 kfree(tu->tqueue); 1643 tu->queue_size = params.queue_size; 1644 tu->tqueue = ttr; 1645 } 1646 } else { 1647 tr = kmalloc(params.queue_size * sizeof(*tr), 1648 GFP_KERNEL); 1649 if (tr) { 1650 kfree(tu->queue); 1651 tu->queue_size = params.queue_size; 1652 tu->queue = tr; 1653 } 1654 } 1655 } 1656 tu->qhead = tu->qtail = tu->qused = 0; 1657 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1658 if (tu->tread) { 1659 struct snd_timer_tread tread; 1660 tread.event = SNDRV_TIMER_EVENT_EARLY; 1661 tread.tstamp.tv_sec = 0; 1662 tread.tstamp.tv_nsec = 0; 1663 tread.val = 0; 1664 snd_timer_user_append_to_tqueue(tu, &tread); 1665 } else { 1666 struct snd_timer_read *r = &tu->queue[0]; 1667 r->resolution = 0; 1668 r->ticks = 0; 1669 tu->qused++; 1670 tu->qtail++; 1671 } 1672 } 1673 tu->filter = params.filter; 1674 tu->ticks = params.ticks; 1675 err = 0; 1676 _end: 1677 if (copy_to_user(_params, ¶ms, sizeof(params))) 1678 return -EFAULT; 1679 return err; 1680 } 1681 1682 static int snd_timer_user_status(struct file *file, 1683 struct snd_timer_status __user *_status) 1684 { 1685 struct snd_timer_user *tu; 1686 struct snd_timer_status status; 1687 1688 tu = file->private_data; 1689 if (!tu->timeri) 1690 return -EBADFD; 1691 memset(&status, 0, sizeof(status)); 1692 status.tstamp = tu->tstamp; 1693 status.resolution = snd_timer_resolution(tu->timeri); 1694 status.lost = tu->timeri->lost; 1695 status.overrun = tu->overrun; 1696 spin_lock_irq(&tu->qlock); 1697 status.queue = tu->qused; 1698 spin_unlock_irq(&tu->qlock); 1699 if (copy_to_user(_status, &status, sizeof(status))) 1700 return -EFAULT; 1701 return 0; 1702 } 1703 1704 static int snd_timer_user_start(struct file *file) 1705 { 1706 int err; 1707 struct snd_timer_user *tu; 1708 1709 tu = file->private_data; 1710 if (!tu->timeri) 1711 return -EBADFD; 1712 snd_timer_stop(tu->timeri); 1713 tu->timeri->lost = 0; 1714 tu->last_resolution = 0; 1715 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1716 } 1717 1718 static int snd_timer_user_stop(struct file *file) 1719 { 1720 int err; 1721 struct snd_timer_user *tu; 1722 1723 tu = file->private_data; 1724 if (!tu->timeri) 1725 return -EBADFD; 1726 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1727 } 1728 1729 static int snd_timer_user_continue(struct file *file) 1730 { 1731 int err; 1732 struct snd_timer_user *tu; 1733 1734 tu = file->private_data; 1735 if (!tu->timeri) 1736 return -EBADFD; 1737 tu->timeri->lost = 0; 1738 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1739 } 1740 1741 static int snd_timer_user_pause(struct file *file) 1742 { 1743 int err; 1744 struct snd_timer_user *tu; 1745 1746 tu = file->private_data; 1747 if (!tu->timeri) 1748 return -EBADFD; 1749 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1750 } 1751 1752 enum { 1753 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1754 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1755 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1756 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1757 }; 1758 1759 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1760 unsigned long arg) 1761 { 1762 struct snd_timer_user *tu; 1763 void __user *argp = (void __user *)arg; 1764 int __user *p = argp; 1765 1766 tu = file->private_data; 1767 switch (cmd) { 1768 case SNDRV_TIMER_IOCTL_PVERSION: 1769 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1770 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1771 return snd_timer_user_next_device(argp); 1772 case SNDRV_TIMER_IOCTL_TREAD: 1773 { 1774 int xarg; 1775 1776 mutex_lock(&tu->tread_sem); 1777 if (tu->timeri) { /* too late */ 1778 mutex_unlock(&tu->tread_sem); 1779 return -EBUSY; 1780 } 1781 if (get_user(xarg, p)) { 1782 mutex_unlock(&tu->tread_sem); 1783 return -EFAULT; 1784 } 1785 tu->tread = xarg ? 1 : 0; 1786 mutex_unlock(&tu->tread_sem); 1787 return 0; 1788 } 1789 case SNDRV_TIMER_IOCTL_GINFO: 1790 return snd_timer_user_ginfo(file, argp); 1791 case SNDRV_TIMER_IOCTL_GPARAMS: 1792 return snd_timer_user_gparams(file, argp); 1793 case SNDRV_TIMER_IOCTL_GSTATUS: 1794 return snd_timer_user_gstatus(file, argp); 1795 case SNDRV_TIMER_IOCTL_SELECT: 1796 return snd_timer_user_tselect(file, argp); 1797 case SNDRV_TIMER_IOCTL_INFO: 1798 return snd_timer_user_info(file, argp); 1799 case SNDRV_TIMER_IOCTL_PARAMS: 1800 return snd_timer_user_params(file, argp); 1801 case SNDRV_TIMER_IOCTL_STATUS: 1802 return snd_timer_user_status(file, argp); 1803 case SNDRV_TIMER_IOCTL_START: 1804 case SNDRV_TIMER_IOCTL_START_OLD: 1805 return snd_timer_user_start(file); 1806 case SNDRV_TIMER_IOCTL_STOP: 1807 case SNDRV_TIMER_IOCTL_STOP_OLD: 1808 return snd_timer_user_stop(file); 1809 case SNDRV_TIMER_IOCTL_CONTINUE: 1810 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1811 return snd_timer_user_continue(file); 1812 case SNDRV_TIMER_IOCTL_PAUSE: 1813 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1814 return snd_timer_user_pause(file); 1815 } 1816 return -ENOTTY; 1817 } 1818 1819 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1820 { 1821 struct snd_timer_user *tu; 1822 int err; 1823 1824 tu = file->private_data; 1825 err = fasync_helper(fd, file, on, &tu->fasync); 1826 if (err < 0) 1827 return err; 1828 return 0; 1829 } 1830 1831 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1832 size_t count, loff_t *offset) 1833 { 1834 struct snd_timer_user *tu; 1835 long result = 0, unit; 1836 int err = 0; 1837 1838 tu = file->private_data; 1839 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1840 spin_lock_irq(&tu->qlock); 1841 while ((long)count - result >= unit) { 1842 while (!tu->qused) { 1843 wait_queue_t wait; 1844 1845 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1846 err = -EAGAIN; 1847 break; 1848 } 1849 1850 set_current_state(TASK_INTERRUPTIBLE); 1851 init_waitqueue_entry(&wait, current); 1852 add_wait_queue(&tu->qchange_sleep, &wait); 1853 1854 spin_unlock_irq(&tu->qlock); 1855 schedule(); 1856 spin_lock_irq(&tu->qlock); 1857 1858 remove_wait_queue(&tu->qchange_sleep, &wait); 1859 1860 if (signal_pending(current)) { 1861 err = -ERESTARTSYS; 1862 break; 1863 } 1864 } 1865 1866 spin_unlock_irq(&tu->qlock); 1867 if (err < 0) 1868 goto _error; 1869 1870 if (tu->tread) { 1871 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1872 sizeof(struct snd_timer_tread))) { 1873 err = -EFAULT; 1874 goto _error; 1875 } 1876 } else { 1877 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1878 sizeof(struct snd_timer_read))) { 1879 err = -EFAULT; 1880 goto _error; 1881 } 1882 } 1883 1884 tu->qhead %= tu->queue_size; 1885 1886 result += unit; 1887 buffer += unit; 1888 1889 spin_lock_irq(&tu->qlock); 1890 tu->qused--; 1891 } 1892 spin_unlock_irq(&tu->qlock); 1893 _error: 1894 return result > 0 ? result : err; 1895 } 1896 1897 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1898 { 1899 unsigned int mask; 1900 struct snd_timer_user *tu; 1901 1902 tu = file->private_data; 1903 1904 poll_wait(file, &tu->qchange_sleep, wait); 1905 1906 mask = 0; 1907 if (tu->qused) 1908 mask |= POLLIN | POLLRDNORM; 1909 1910 return mask; 1911 } 1912 1913 #ifdef CONFIG_COMPAT 1914 #include "timer_compat.c" 1915 #else 1916 #define snd_timer_user_ioctl_compat NULL 1917 #endif 1918 1919 static const struct file_operations snd_timer_f_ops = 1920 { 1921 .owner = THIS_MODULE, 1922 .read = snd_timer_user_read, 1923 .open = snd_timer_user_open, 1924 .release = snd_timer_user_release, 1925 .poll = snd_timer_user_poll, 1926 .unlocked_ioctl = snd_timer_user_ioctl, 1927 .compat_ioctl = snd_timer_user_ioctl_compat, 1928 .fasync = snd_timer_user_fasync, 1929 }; 1930 1931 /* 1932 * ENTRY functions 1933 */ 1934 1935 static int __init alsa_timer_init(void) 1936 { 1937 int err; 1938 1939 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1940 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1941 "system timer"); 1942 #endif 1943 1944 if ((err = snd_timer_register_system()) < 0) 1945 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1946 err); 1947 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1948 &snd_timer_f_ops, NULL, "timer")) < 0) 1949 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1950 err); 1951 snd_timer_proc_init(); 1952 return 0; 1953 } 1954 1955 static void __exit alsa_timer_exit(void) 1956 { 1957 struct list_head *p, *n; 1958 1959 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1960 /* unregister the system timer */ 1961 list_for_each_safe(p, n, &snd_timer_list) { 1962 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1963 snd_timer_free(timer); 1964 } 1965 snd_timer_proc_done(); 1966 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1967 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1968 #endif 1969 } 1970 1971 module_init(alsa_timer_init) 1972 module_exit(alsa_timer_exit) 1973 1974 EXPORT_SYMBOL(snd_timer_open); 1975 EXPORT_SYMBOL(snd_timer_close); 1976 EXPORT_SYMBOL(snd_timer_resolution); 1977 EXPORT_SYMBOL(snd_timer_start); 1978 EXPORT_SYMBOL(snd_timer_stop); 1979 EXPORT_SYMBOL(snd_timer_continue); 1980 EXPORT_SYMBOL(snd_timer_pause); 1981 EXPORT_SYMBOL(snd_timer_new); 1982 EXPORT_SYMBOL(snd_timer_notify); 1983 EXPORT_SYMBOL(snd_timer_global_new); 1984 EXPORT_SYMBOL(snd_timer_global_free); 1985 EXPORT_SYMBOL(snd_timer_global_register); 1986 EXPORT_SYMBOL(snd_timer_interrupt); 1987