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