1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/delay.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/device.h> 28 #include <linux/module.h> 29 #include <linux/string.h> 30 #include <sound/core.h> 31 #include <sound/timer.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/minors.h> 35 #include <sound/initval.h> 36 #include <linux/kmod.h> 37 38 #if IS_ENABLED(CONFIG_SND_HRTIMER) 39 #define DEFAULT_TIMER_LIMIT 4 40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER) 41 #define DEFAULT_TIMER_LIMIT 2 42 #else 43 #define DEFAULT_TIMER_LIMIT 1 44 #endif 45 46 static int timer_limit = DEFAULT_TIMER_LIMIT; 47 static int timer_tstamp_monotonic = 1; 48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 49 MODULE_DESCRIPTION("ALSA timer interface"); 50 MODULE_LICENSE("GPL"); 51 module_param(timer_limit, int, 0444); 52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 53 module_param(timer_tstamp_monotonic, int, 0444); 54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 55 56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 57 MODULE_ALIAS("devname:snd/timer"); 58 59 struct snd_timer_user { 60 struct snd_timer_instance *timeri; 61 int tread; /* enhanced read with timestamps and events */ 62 unsigned long ticks; 63 unsigned long overrun; 64 int qhead; 65 int qtail; 66 int qused; 67 int queue_size; 68 struct snd_timer_read *queue; 69 struct snd_timer_tread *tqueue; 70 spinlock_t qlock; 71 unsigned long last_resolution; 72 unsigned int filter; 73 struct timespec tstamp; /* trigger tstamp */ 74 wait_queue_head_t qchange_sleep; 75 struct fasync_struct *fasync; 76 struct mutex tread_sem; 77 }; 78 79 /* list of timers */ 80 static LIST_HEAD(snd_timer_list); 81 82 /* list of slave instances */ 83 static LIST_HEAD(snd_timer_slave_list); 84 85 /* lock for slave active lists */ 86 static DEFINE_SPINLOCK(slave_active_lock); 87 88 static DEFINE_MUTEX(register_mutex); 89 90 static int snd_timer_free(struct snd_timer *timer); 91 static int snd_timer_dev_free(struct snd_device *device); 92 static int snd_timer_dev_register(struct snd_device *device); 93 static int snd_timer_dev_disconnect(struct snd_device *device); 94 95 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 96 97 /* 98 * create a timer instance with the given owner string. 99 * when timer is not NULL, increments the module counter 100 */ 101 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 102 struct snd_timer *timer) 103 { 104 struct snd_timer_instance *timeri; 105 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 106 if (timeri == NULL) 107 return NULL; 108 timeri->owner = kstrdup(owner, GFP_KERNEL); 109 if (! timeri->owner) { 110 kfree(timeri); 111 return NULL; 112 } 113 INIT_LIST_HEAD(&timeri->open_list); 114 INIT_LIST_HEAD(&timeri->active_list); 115 INIT_LIST_HEAD(&timeri->ack_list); 116 INIT_LIST_HEAD(&timeri->slave_list_head); 117 INIT_LIST_HEAD(&timeri->slave_active_head); 118 119 timeri->timer = timer; 120 if (timer && !try_module_get(timer->module)) { 121 kfree(timeri->owner); 122 kfree(timeri); 123 return NULL; 124 } 125 126 return timeri; 127 } 128 129 /* 130 * find a timer instance from the given timer id 131 */ 132 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 133 { 134 struct snd_timer *timer = NULL; 135 136 list_for_each_entry(timer, &snd_timer_list, device_list) { 137 if (timer->tmr_class != tid->dev_class) 138 continue; 139 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 140 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 141 (timer->card == NULL || 142 timer->card->number != tid->card)) 143 continue; 144 if (timer->tmr_device != tid->device) 145 continue; 146 if (timer->tmr_subdevice != tid->subdevice) 147 continue; 148 return timer; 149 } 150 return NULL; 151 } 152 153 #ifdef CONFIG_MODULES 154 155 static void snd_timer_request(struct snd_timer_id *tid) 156 { 157 switch (tid->dev_class) { 158 case SNDRV_TIMER_CLASS_GLOBAL: 159 if (tid->device < timer_limit) 160 request_module("snd-timer-%i", tid->device); 161 break; 162 case SNDRV_TIMER_CLASS_CARD: 163 case SNDRV_TIMER_CLASS_PCM: 164 if (tid->card < snd_ecards_limit) 165 request_module("snd-card-%i", tid->card); 166 break; 167 default: 168 break; 169 } 170 } 171 172 #endif 173 174 /* 175 * look for a master instance matching with the slave id of the given slave. 176 * when found, relink the open_link of the slave. 177 * 178 * call this with register_mutex down. 179 */ 180 static void snd_timer_check_slave(struct snd_timer_instance *slave) 181 { 182 struct snd_timer *timer; 183 struct snd_timer_instance *master; 184 185 /* FIXME: it's really dumb to look up all entries.. */ 186 list_for_each_entry(timer, &snd_timer_list, device_list) { 187 list_for_each_entry(master, &timer->open_list_head, open_list) { 188 if (slave->slave_class == master->slave_class && 189 slave->slave_id == master->slave_id) { 190 list_move_tail(&slave->open_list, 191 &master->slave_list_head); 192 spin_lock_irq(&slave_active_lock); 193 slave->master = master; 194 slave->timer = master->timer; 195 spin_unlock_irq(&slave_active_lock); 196 return; 197 } 198 } 199 } 200 } 201 202 /* 203 * look for slave instances matching with the slave id of the given master. 204 * when found, relink the open_link of slaves. 205 * 206 * call this with register_mutex down. 207 */ 208 static void snd_timer_check_master(struct snd_timer_instance *master) 209 { 210 struct snd_timer_instance *slave, *tmp; 211 212 /* check all pending slaves */ 213 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 214 if (slave->slave_class == master->slave_class && 215 slave->slave_id == master->slave_id) { 216 list_move_tail(&slave->open_list, &master->slave_list_head); 217 spin_lock_irq(&slave_active_lock); 218 slave->master = master; 219 slave->timer = master->timer; 220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 221 list_add_tail(&slave->active_list, 222 &master->slave_active_head); 223 spin_unlock_irq(&slave_active_lock); 224 } 225 } 226 } 227 228 /* 229 * open a timer instance 230 * when opening a master, the slave id must be here given. 231 */ 232 int snd_timer_open(struct snd_timer_instance **ti, 233 char *owner, struct snd_timer_id *tid, 234 unsigned int slave_id) 235 { 236 struct snd_timer *timer; 237 struct snd_timer_instance *timeri = NULL; 238 239 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 240 /* open a slave instance */ 241 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 242 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 243 pr_debug("ALSA: timer: invalid slave class %i\n", 244 tid->dev_sclass); 245 return -EINVAL; 246 } 247 mutex_lock(®ister_mutex); 248 timeri = snd_timer_instance_new(owner, NULL); 249 if (!timeri) { 250 mutex_unlock(®ister_mutex); 251 return -ENOMEM; 252 } 253 timeri->slave_class = tid->dev_sclass; 254 timeri->slave_id = tid->device; 255 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 256 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 257 snd_timer_check_slave(timeri); 258 mutex_unlock(®ister_mutex); 259 *ti = timeri; 260 return 0; 261 } 262 263 /* open a master instance */ 264 mutex_lock(®ister_mutex); 265 timer = snd_timer_find(tid); 266 #ifdef CONFIG_MODULES 267 if (!timer) { 268 mutex_unlock(®ister_mutex); 269 snd_timer_request(tid); 270 mutex_lock(®ister_mutex); 271 timer = snd_timer_find(tid); 272 } 273 #endif 274 if (!timer) { 275 mutex_unlock(®ister_mutex); 276 return -ENODEV; 277 } 278 if (!list_empty(&timer->open_list_head)) { 279 timeri = list_entry(timer->open_list_head.next, 280 struct snd_timer_instance, open_list); 281 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 282 mutex_unlock(®ister_mutex); 283 return -EBUSY; 284 } 285 } 286 timeri = snd_timer_instance_new(owner, timer); 287 if (!timeri) { 288 mutex_unlock(®ister_mutex); 289 return -ENOMEM; 290 } 291 timeri->slave_class = tid->dev_sclass; 292 timeri->slave_id = slave_id; 293 if (list_empty(&timer->open_list_head) && timer->hw.open) 294 timer->hw.open(timer); 295 list_add_tail(&timeri->open_list, &timer->open_list_head); 296 snd_timer_check_master(timeri); 297 mutex_unlock(®ister_mutex); 298 *ti = timeri; 299 return 0; 300 } 301 302 static int _snd_timer_stop(struct snd_timer_instance *timeri, 303 int keep_flag, int event); 304 305 /* 306 * close a timer instance 307 */ 308 int snd_timer_close(struct snd_timer_instance *timeri) 309 { 310 struct snd_timer *timer = NULL; 311 struct snd_timer_instance *slave, *tmp; 312 313 if (snd_BUG_ON(!timeri)) 314 return -ENXIO; 315 316 /* force to stop the timer */ 317 snd_timer_stop(timeri); 318 319 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 320 /* wait, until the active callback is finished */ 321 spin_lock_irq(&slave_active_lock); 322 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 323 spin_unlock_irq(&slave_active_lock); 324 udelay(10); 325 spin_lock_irq(&slave_active_lock); 326 } 327 spin_unlock_irq(&slave_active_lock); 328 mutex_lock(®ister_mutex); 329 list_del(&timeri->open_list); 330 mutex_unlock(®ister_mutex); 331 } else { 332 timer = timeri->timer; 333 if (snd_BUG_ON(!timer)) 334 goto out; 335 /* wait, until the active callback is finished */ 336 spin_lock_irq(&timer->lock); 337 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 338 spin_unlock_irq(&timer->lock); 339 udelay(10); 340 spin_lock_irq(&timer->lock); 341 } 342 spin_unlock_irq(&timer->lock); 343 mutex_lock(®ister_mutex); 344 list_del(&timeri->open_list); 345 if (timer && list_empty(&timer->open_list_head) && 346 timer->hw.close) 347 timer->hw.close(timer); 348 /* remove slave links */ 349 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 350 open_list) { 351 spin_lock_irq(&slave_active_lock); 352 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 353 list_move_tail(&slave->open_list, &snd_timer_slave_list); 354 slave->master = NULL; 355 slave->timer = NULL; 356 spin_unlock_irq(&slave_active_lock); 357 } 358 mutex_unlock(®ister_mutex); 359 } 360 out: 361 if (timeri->private_free) 362 timeri->private_free(timeri); 363 kfree(timeri->owner); 364 kfree(timeri); 365 if (timer) 366 module_put(timer->module); 367 return 0; 368 } 369 370 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 371 { 372 struct snd_timer * timer; 373 374 if (timeri == NULL) 375 return 0; 376 if ((timer = timeri->timer) != NULL) { 377 if (timer->hw.c_resolution) 378 return timer->hw.c_resolution(timer); 379 return timer->hw.resolution; 380 } 381 return 0; 382 } 383 384 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 385 { 386 struct snd_timer *timer; 387 unsigned long flags; 388 unsigned long resolution = 0; 389 struct snd_timer_instance *ts; 390 struct timespec tstamp; 391 392 if (timer_tstamp_monotonic) 393 ktime_get_ts(&tstamp); 394 else 395 getnstimeofday(&tstamp); 396 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 397 event > SNDRV_TIMER_EVENT_PAUSE)) 398 return; 399 if (event == SNDRV_TIMER_EVENT_START || 400 event == SNDRV_TIMER_EVENT_CONTINUE) 401 resolution = snd_timer_resolution(ti); 402 if (ti->ccallback) 403 ti->ccallback(ti, event, &tstamp, resolution); 404 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 405 return; 406 timer = ti->timer; 407 if (timer == NULL) 408 return; 409 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 410 return; 411 spin_lock_irqsave(&timer->lock, flags); 412 list_for_each_entry(ts, &ti->slave_active_head, active_list) 413 if (ts->ccallback) 414 ts->ccallback(ti, event + 100, &tstamp, resolution); 415 spin_unlock_irqrestore(&timer->lock, flags); 416 } 417 418 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 419 unsigned long sticks) 420 { 421 list_move_tail(&timeri->active_list, &timer->active_list_head); 422 if (timer->running) { 423 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 424 goto __start_now; 425 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 426 timeri->flags |= SNDRV_TIMER_IFLG_START; 427 return 1; /* delayed start */ 428 } else { 429 timer->sticks = sticks; 430 timer->hw.start(timer); 431 __start_now: 432 timer->running++; 433 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 434 return 0; 435 } 436 } 437 438 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 439 { 440 unsigned long flags; 441 442 spin_lock_irqsave(&slave_active_lock, flags); 443 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 444 if (timeri->master) 445 list_add_tail(&timeri->active_list, 446 &timeri->master->slave_active_head); 447 spin_unlock_irqrestore(&slave_active_lock, flags); 448 return 1; /* delayed start */ 449 } 450 451 /* 452 * start the timer instance 453 */ 454 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 455 { 456 struct snd_timer *timer; 457 int result = -EINVAL; 458 unsigned long flags; 459 460 if (timeri == NULL || ticks < 1) 461 return -EINVAL; 462 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 463 result = snd_timer_start_slave(timeri); 464 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 465 return result; 466 } 467 timer = timeri->timer; 468 if (timer == NULL) 469 return -EINVAL; 470 spin_lock_irqsave(&timer->lock, flags); 471 timeri->ticks = timeri->cticks = ticks; 472 timeri->pticks = 0; 473 result = snd_timer_start1(timer, timeri, ticks); 474 spin_unlock_irqrestore(&timer->lock, flags); 475 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 476 return result; 477 } 478 479 static int _snd_timer_stop(struct snd_timer_instance * timeri, 480 int keep_flag, int event) 481 { 482 struct snd_timer *timer; 483 unsigned long flags; 484 485 if (snd_BUG_ON(!timeri)) 486 return -ENXIO; 487 488 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 489 if (!keep_flag) { 490 spin_lock_irqsave(&slave_active_lock, flags); 491 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 492 spin_unlock_irqrestore(&slave_active_lock, flags); 493 } 494 goto __end; 495 } 496 timer = timeri->timer; 497 if (!timer) 498 return -EINVAL; 499 spin_lock_irqsave(&timer->lock, flags); 500 list_del_init(&timeri->ack_list); 501 list_del_init(&timeri->active_list); 502 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 503 !(--timer->running)) { 504 timer->hw.stop(timer); 505 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 506 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 507 snd_timer_reschedule(timer, 0); 508 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 509 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 510 timer->hw.start(timer); 511 } 512 } 513 } 514 if (!keep_flag) 515 timeri->flags &= 516 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 517 spin_unlock_irqrestore(&timer->lock, flags); 518 __end: 519 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 520 snd_timer_notify1(timeri, event); 521 return 0; 522 } 523 524 /* 525 * stop the timer instance. 526 * 527 * do not call this from the timer callback! 528 */ 529 int snd_timer_stop(struct snd_timer_instance *timeri) 530 { 531 struct snd_timer *timer; 532 unsigned long flags; 533 int err; 534 535 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 536 if (err < 0) 537 return err; 538 timer = timeri->timer; 539 if (!timer) 540 return -EINVAL; 541 spin_lock_irqsave(&timer->lock, flags); 542 timeri->cticks = timeri->ticks; 543 timeri->pticks = 0; 544 spin_unlock_irqrestore(&timer->lock, flags); 545 return 0; 546 } 547 548 /* 549 * start again.. the tick is kept. 550 */ 551 int snd_timer_continue(struct snd_timer_instance *timeri) 552 { 553 struct snd_timer *timer; 554 int result = -EINVAL; 555 unsigned long flags; 556 557 if (timeri == NULL) 558 return result; 559 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 560 return snd_timer_start_slave(timeri); 561 timer = timeri->timer; 562 if (! timer) 563 return -EINVAL; 564 spin_lock_irqsave(&timer->lock, flags); 565 if (!timeri->cticks) 566 timeri->cticks = 1; 567 timeri->pticks = 0; 568 result = snd_timer_start1(timer, timeri, timer->sticks); 569 spin_unlock_irqrestore(&timer->lock, flags); 570 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 571 return result; 572 } 573 574 /* 575 * pause.. remember the ticks left 576 */ 577 int snd_timer_pause(struct snd_timer_instance * timeri) 578 { 579 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 580 } 581 582 /* 583 * reschedule the timer 584 * 585 * start pending instances and check the scheduling ticks. 586 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 587 */ 588 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 589 { 590 struct snd_timer_instance *ti; 591 unsigned long ticks = ~0UL; 592 593 list_for_each_entry(ti, &timer->active_list_head, active_list) { 594 if (ti->flags & SNDRV_TIMER_IFLG_START) { 595 ti->flags &= ~SNDRV_TIMER_IFLG_START; 596 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 597 timer->running++; 598 } 599 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 600 if (ticks > ti->cticks) 601 ticks = ti->cticks; 602 } 603 } 604 if (ticks == ~0UL) { 605 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 606 return; 607 } 608 if (ticks > timer->hw.ticks) 609 ticks = timer->hw.ticks; 610 if (ticks_left != ticks) 611 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 612 timer->sticks = ticks; 613 } 614 615 /* 616 * timer tasklet 617 * 618 */ 619 static void snd_timer_tasklet(unsigned long arg) 620 { 621 struct snd_timer *timer = (struct snd_timer *) arg; 622 struct snd_timer_instance *ti; 623 struct list_head *p; 624 unsigned long resolution, ticks; 625 unsigned long flags; 626 627 spin_lock_irqsave(&timer->lock, flags); 628 /* now process all callbacks */ 629 while (!list_empty(&timer->sack_list_head)) { 630 p = timer->sack_list_head.next; /* get first item */ 631 ti = list_entry(p, struct snd_timer_instance, ack_list); 632 633 /* remove from ack_list and make empty */ 634 list_del_init(p); 635 636 ticks = ti->pticks; 637 ti->pticks = 0; 638 resolution = ti->resolution; 639 640 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 641 spin_unlock(&timer->lock); 642 if (ti->callback) 643 ti->callback(ti, resolution, ticks); 644 spin_lock(&timer->lock); 645 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 646 } 647 spin_unlock_irqrestore(&timer->lock, flags); 648 } 649 650 /* 651 * timer interrupt 652 * 653 * ticks_left is usually equal to timer->sticks. 654 * 655 */ 656 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 657 { 658 struct snd_timer_instance *ti, *ts, *tmp; 659 unsigned long resolution, ticks; 660 struct list_head *p, *ack_list_head; 661 unsigned long flags; 662 int use_tasklet = 0; 663 664 if (timer == NULL) 665 return; 666 667 spin_lock_irqsave(&timer->lock, flags); 668 669 /* remember the current resolution */ 670 if (timer->hw.c_resolution) 671 resolution = timer->hw.c_resolution(timer); 672 else 673 resolution = timer->hw.resolution; 674 675 /* loop for all active instances 676 * Here we cannot use list_for_each_entry because the active_list of a 677 * processed instance is relinked to done_list_head before the callback 678 * is called. 679 */ 680 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 681 active_list) { 682 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 683 continue; 684 ti->pticks += ticks_left; 685 ti->resolution = resolution; 686 if (ti->cticks < ticks_left) 687 ti->cticks = 0; 688 else 689 ti->cticks -= ticks_left; 690 if (ti->cticks) /* not expired */ 691 continue; 692 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 693 ti->cticks = ti->ticks; 694 } else { 695 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 696 if (--timer->running) 697 list_del(&ti->active_list); 698 } 699 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 700 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 701 ack_list_head = &timer->ack_list_head; 702 else 703 ack_list_head = &timer->sack_list_head; 704 if (list_empty(&ti->ack_list)) 705 list_add_tail(&ti->ack_list, ack_list_head); 706 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 707 ts->pticks = ti->pticks; 708 ts->resolution = resolution; 709 if (list_empty(&ts->ack_list)) 710 list_add_tail(&ts->ack_list, ack_list_head); 711 } 712 } 713 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 714 snd_timer_reschedule(timer, timer->sticks); 715 if (timer->running) { 716 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 717 timer->hw.stop(timer); 718 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 719 } 720 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 721 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 722 /* restart timer */ 723 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 724 timer->hw.start(timer); 725 } 726 } else { 727 timer->hw.stop(timer); 728 } 729 730 /* now process all fast callbacks */ 731 while (!list_empty(&timer->ack_list_head)) { 732 p = timer->ack_list_head.next; /* get first item */ 733 ti = list_entry(p, struct snd_timer_instance, ack_list); 734 735 /* remove from ack_list and make empty */ 736 list_del_init(p); 737 738 ticks = ti->pticks; 739 ti->pticks = 0; 740 741 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 742 spin_unlock(&timer->lock); 743 if (ti->callback) 744 ti->callback(ti, resolution, ticks); 745 spin_lock(&timer->lock); 746 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 747 } 748 749 /* do we have any slow callbacks? */ 750 use_tasklet = !list_empty(&timer->sack_list_head); 751 spin_unlock_irqrestore(&timer->lock, flags); 752 753 if (use_tasklet) 754 tasklet_schedule(&timer->task_queue); 755 } 756 757 /* 758 759 */ 760 761 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 762 struct snd_timer **rtimer) 763 { 764 struct snd_timer *timer; 765 int err; 766 static struct snd_device_ops ops = { 767 .dev_free = snd_timer_dev_free, 768 .dev_register = snd_timer_dev_register, 769 .dev_disconnect = snd_timer_dev_disconnect, 770 }; 771 772 if (snd_BUG_ON(!tid)) 773 return -EINVAL; 774 if (rtimer) 775 *rtimer = NULL; 776 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 777 if (!timer) 778 return -ENOMEM; 779 timer->tmr_class = tid->dev_class; 780 timer->card = card; 781 timer->tmr_device = tid->device; 782 timer->tmr_subdevice = tid->subdevice; 783 if (id) 784 strlcpy(timer->id, id, sizeof(timer->id)); 785 INIT_LIST_HEAD(&timer->device_list); 786 INIT_LIST_HEAD(&timer->open_list_head); 787 INIT_LIST_HEAD(&timer->active_list_head); 788 INIT_LIST_HEAD(&timer->ack_list_head); 789 INIT_LIST_HEAD(&timer->sack_list_head); 790 spin_lock_init(&timer->lock); 791 tasklet_init(&timer->task_queue, snd_timer_tasklet, 792 (unsigned long)timer); 793 if (card != NULL) { 794 timer->module = card->module; 795 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 796 if (err < 0) { 797 snd_timer_free(timer); 798 return err; 799 } 800 } 801 if (rtimer) 802 *rtimer = timer; 803 return 0; 804 } 805 806 static int snd_timer_free(struct snd_timer *timer) 807 { 808 if (!timer) 809 return 0; 810 811 mutex_lock(®ister_mutex); 812 if (! list_empty(&timer->open_list_head)) { 813 struct list_head *p, *n; 814 struct snd_timer_instance *ti; 815 pr_warn("ALSA: timer %p is busy?\n", timer); 816 list_for_each_safe(p, n, &timer->open_list_head) { 817 list_del_init(p); 818 ti = list_entry(p, struct snd_timer_instance, open_list); 819 ti->timer = NULL; 820 } 821 } 822 list_del(&timer->device_list); 823 mutex_unlock(®ister_mutex); 824 825 if (timer->private_free) 826 timer->private_free(timer); 827 kfree(timer); 828 return 0; 829 } 830 831 static int snd_timer_dev_free(struct snd_device *device) 832 { 833 struct snd_timer *timer = device->device_data; 834 return snd_timer_free(timer); 835 } 836 837 static int snd_timer_dev_register(struct snd_device *dev) 838 { 839 struct snd_timer *timer = dev->device_data; 840 struct snd_timer *timer1; 841 842 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 843 return -ENXIO; 844 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 845 !timer->hw.resolution && timer->hw.c_resolution == NULL) 846 return -EINVAL; 847 848 mutex_lock(®ister_mutex); 849 list_for_each_entry(timer1, &snd_timer_list, device_list) { 850 if (timer1->tmr_class > timer->tmr_class) 851 break; 852 if (timer1->tmr_class < timer->tmr_class) 853 continue; 854 if (timer1->card && timer->card) { 855 if (timer1->card->number > timer->card->number) 856 break; 857 if (timer1->card->number < timer->card->number) 858 continue; 859 } 860 if (timer1->tmr_device > timer->tmr_device) 861 break; 862 if (timer1->tmr_device < timer->tmr_device) 863 continue; 864 if (timer1->tmr_subdevice > timer->tmr_subdevice) 865 break; 866 if (timer1->tmr_subdevice < timer->tmr_subdevice) 867 continue; 868 /* conflicts.. */ 869 mutex_unlock(®ister_mutex); 870 return -EBUSY; 871 } 872 list_add_tail(&timer->device_list, &timer1->device_list); 873 mutex_unlock(®ister_mutex); 874 return 0; 875 } 876 877 static int snd_timer_dev_disconnect(struct snd_device *device) 878 { 879 struct snd_timer *timer = device->device_data; 880 mutex_lock(®ister_mutex); 881 list_del_init(&timer->device_list); 882 mutex_unlock(®ister_mutex); 883 return 0; 884 } 885 886 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 887 { 888 unsigned long flags; 889 unsigned long resolution = 0; 890 struct snd_timer_instance *ti, *ts; 891 892 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 893 return; 894 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 895 event > SNDRV_TIMER_EVENT_MRESUME)) 896 return; 897 spin_lock_irqsave(&timer->lock, flags); 898 if (event == SNDRV_TIMER_EVENT_MSTART || 899 event == SNDRV_TIMER_EVENT_MCONTINUE || 900 event == SNDRV_TIMER_EVENT_MRESUME) { 901 if (timer->hw.c_resolution) 902 resolution = timer->hw.c_resolution(timer); 903 else 904 resolution = timer->hw.resolution; 905 } 906 list_for_each_entry(ti, &timer->active_list_head, active_list) { 907 if (ti->ccallback) 908 ti->ccallback(ti, event, tstamp, resolution); 909 list_for_each_entry(ts, &ti->slave_active_head, active_list) 910 if (ts->ccallback) 911 ts->ccallback(ts, event, tstamp, resolution); 912 } 913 spin_unlock_irqrestore(&timer->lock, flags); 914 } 915 916 /* 917 * exported functions for global timers 918 */ 919 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 920 { 921 struct snd_timer_id tid; 922 923 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 924 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 925 tid.card = -1; 926 tid.device = device; 927 tid.subdevice = 0; 928 return snd_timer_new(NULL, id, &tid, rtimer); 929 } 930 931 int snd_timer_global_free(struct snd_timer *timer) 932 { 933 return snd_timer_free(timer); 934 } 935 936 int snd_timer_global_register(struct snd_timer *timer) 937 { 938 struct snd_device dev; 939 940 memset(&dev, 0, sizeof(dev)); 941 dev.device_data = timer; 942 return snd_timer_dev_register(&dev); 943 } 944 945 /* 946 * System timer 947 */ 948 949 struct snd_timer_system_private { 950 struct timer_list tlist; 951 unsigned long last_expires; 952 unsigned long last_jiffies; 953 unsigned long correction; 954 }; 955 956 static void snd_timer_s_function(unsigned long data) 957 { 958 struct snd_timer *timer = (struct snd_timer *)data; 959 struct snd_timer_system_private *priv = timer->private_data; 960 unsigned long jiff = jiffies; 961 if (time_after(jiff, priv->last_expires)) 962 priv->correction += (long)jiff - (long)priv->last_expires; 963 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 964 } 965 966 static int snd_timer_s_start(struct snd_timer * timer) 967 { 968 struct snd_timer_system_private *priv; 969 unsigned long njiff; 970 971 priv = (struct snd_timer_system_private *) timer->private_data; 972 njiff = (priv->last_jiffies = jiffies); 973 if (priv->correction > timer->sticks - 1) { 974 priv->correction -= timer->sticks - 1; 975 njiff++; 976 } else { 977 njiff += timer->sticks - priv->correction; 978 priv->correction = 0; 979 } 980 priv->last_expires = priv->tlist.expires = njiff; 981 add_timer(&priv->tlist); 982 return 0; 983 } 984 985 static int snd_timer_s_stop(struct snd_timer * timer) 986 { 987 struct snd_timer_system_private *priv; 988 unsigned long jiff; 989 990 priv = (struct snd_timer_system_private *) timer->private_data; 991 del_timer(&priv->tlist); 992 jiff = jiffies; 993 if (time_before(jiff, priv->last_expires)) 994 timer->sticks = priv->last_expires - jiff; 995 else 996 timer->sticks = 1; 997 priv->correction = 0; 998 return 0; 999 } 1000 1001 static struct snd_timer_hardware snd_timer_system = 1002 { 1003 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1004 .resolution = 1000000000L / HZ, 1005 .ticks = 10000000L, 1006 .start = snd_timer_s_start, 1007 .stop = snd_timer_s_stop 1008 }; 1009 1010 static void snd_timer_free_system(struct snd_timer *timer) 1011 { 1012 kfree(timer->private_data); 1013 } 1014 1015 static int snd_timer_register_system(void) 1016 { 1017 struct snd_timer *timer; 1018 struct snd_timer_system_private *priv; 1019 int err; 1020 1021 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1022 if (err < 0) 1023 return err; 1024 strcpy(timer->name, "system timer"); 1025 timer->hw = snd_timer_system; 1026 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1027 if (priv == NULL) { 1028 snd_timer_free(timer); 1029 return -ENOMEM; 1030 } 1031 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1032 timer->private_data = priv; 1033 timer->private_free = snd_timer_free_system; 1034 return snd_timer_global_register(timer); 1035 } 1036 1037 #ifdef CONFIG_SND_PROC_FS 1038 /* 1039 * Info interface 1040 */ 1041 1042 static void snd_timer_proc_read(struct snd_info_entry *entry, 1043 struct snd_info_buffer *buffer) 1044 { 1045 struct snd_timer *timer; 1046 struct snd_timer_instance *ti; 1047 1048 mutex_lock(®ister_mutex); 1049 list_for_each_entry(timer, &snd_timer_list, device_list) { 1050 switch (timer->tmr_class) { 1051 case SNDRV_TIMER_CLASS_GLOBAL: 1052 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1053 break; 1054 case SNDRV_TIMER_CLASS_CARD: 1055 snd_iprintf(buffer, "C%i-%i: ", 1056 timer->card->number, timer->tmr_device); 1057 break; 1058 case SNDRV_TIMER_CLASS_PCM: 1059 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1060 timer->tmr_device, timer->tmr_subdevice); 1061 break; 1062 default: 1063 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1064 timer->card ? timer->card->number : -1, 1065 timer->tmr_device, timer->tmr_subdevice); 1066 } 1067 snd_iprintf(buffer, "%s :", timer->name); 1068 if (timer->hw.resolution) 1069 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1070 timer->hw.resolution / 1000, 1071 timer->hw.resolution % 1000, 1072 timer->hw.ticks); 1073 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1074 snd_iprintf(buffer, " SLAVE"); 1075 snd_iprintf(buffer, "\n"); 1076 list_for_each_entry(ti, &timer->open_list_head, open_list) 1077 snd_iprintf(buffer, " Client %s : %s\n", 1078 ti->owner ? ti->owner : "unknown", 1079 ti->flags & (SNDRV_TIMER_IFLG_START | 1080 SNDRV_TIMER_IFLG_RUNNING) 1081 ? "running" : "stopped"); 1082 } 1083 mutex_unlock(®ister_mutex); 1084 } 1085 1086 static struct snd_info_entry *snd_timer_proc_entry; 1087 1088 static void __init snd_timer_proc_init(void) 1089 { 1090 struct snd_info_entry *entry; 1091 1092 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1093 if (entry != NULL) { 1094 entry->c.text.read = snd_timer_proc_read; 1095 if (snd_info_register(entry) < 0) { 1096 snd_info_free_entry(entry); 1097 entry = NULL; 1098 } 1099 } 1100 snd_timer_proc_entry = entry; 1101 } 1102 1103 static void __exit snd_timer_proc_done(void) 1104 { 1105 snd_info_free_entry(snd_timer_proc_entry); 1106 } 1107 #else /* !CONFIG_SND_PROC_FS */ 1108 #define snd_timer_proc_init() 1109 #define snd_timer_proc_done() 1110 #endif 1111 1112 /* 1113 * USER SPACE interface 1114 */ 1115 1116 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1117 unsigned long resolution, 1118 unsigned long ticks) 1119 { 1120 struct snd_timer_user *tu = timeri->callback_data; 1121 struct snd_timer_read *r; 1122 int prev; 1123 1124 spin_lock(&tu->qlock); 1125 if (tu->qused > 0) { 1126 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1127 r = &tu->queue[prev]; 1128 if (r->resolution == resolution) { 1129 r->ticks += ticks; 1130 goto __wake; 1131 } 1132 } 1133 if (tu->qused >= tu->queue_size) { 1134 tu->overrun++; 1135 } else { 1136 r = &tu->queue[tu->qtail++]; 1137 tu->qtail %= tu->queue_size; 1138 r->resolution = resolution; 1139 r->ticks = ticks; 1140 tu->qused++; 1141 } 1142 __wake: 1143 spin_unlock(&tu->qlock); 1144 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1145 wake_up(&tu->qchange_sleep); 1146 } 1147 1148 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1149 struct snd_timer_tread *tread) 1150 { 1151 if (tu->qused >= tu->queue_size) { 1152 tu->overrun++; 1153 } else { 1154 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1155 tu->qtail %= tu->queue_size; 1156 tu->qused++; 1157 } 1158 } 1159 1160 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1161 int event, 1162 struct timespec *tstamp, 1163 unsigned long resolution) 1164 { 1165 struct snd_timer_user *tu = timeri->callback_data; 1166 struct snd_timer_tread r1; 1167 unsigned long flags; 1168 1169 if (event >= SNDRV_TIMER_EVENT_START && 1170 event <= SNDRV_TIMER_EVENT_PAUSE) 1171 tu->tstamp = *tstamp; 1172 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1173 return; 1174 r1.event = event; 1175 r1.tstamp = *tstamp; 1176 r1.val = resolution; 1177 spin_lock_irqsave(&tu->qlock, flags); 1178 snd_timer_user_append_to_tqueue(tu, &r1); 1179 spin_unlock_irqrestore(&tu->qlock, flags); 1180 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1181 wake_up(&tu->qchange_sleep); 1182 } 1183 1184 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1185 unsigned long resolution, 1186 unsigned long ticks) 1187 { 1188 struct snd_timer_user *tu = timeri->callback_data; 1189 struct snd_timer_tread *r, r1; 1190 struct timespec tstamp; 1191 int prev, append = 0; 1192 1193 memset(&tstamp, 0, sizeof(tstamp)); 1194 spin_lock(&tu->qlock); 1195 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1196 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1197 spin_unlock(&tu->qlock); 1198 return; 1199 } 1200 if (tu->last_resolution != resolution || ticks > 0) { 1201 if (timer_tstamp_monotonic) 1202 ktime_get_ts(&tstamp); 1203 else 1204 getnstimeofday(&tstamp); 1205 } 1206 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1207 tu->last_resolution != resolution) { 1208 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1209 r1.tstamp = tstamp; 1210 r1.val = resolution; 1211 snd_timer_user_append_to_tqueue(tu, &r1); 1212 tu->last_resolution = resolution; 1213 append++; 1214 } 1215 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1216 goto __wake; 1217 if (ticks == 0) 1218 goto __wake; 1219 if (tu->qused > 0) { 1220 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1221 r = &tu->tqueue[prev]; 1222 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1223 r->tstamp = tstamp; 1224 r->val += ticks; 1225 append++; 1226 goto __wake; 1227 } 1228 } 1229 r1.event = SNDRV_TIMER_EVENT_TICK; 1230 r1.tstamp = tstamp; 1231 r1.val = ticks; 1232 snd_timer_user_append_to_tqueue(tu, &r1); 1233 append++; 1234 __wake: 1235 spin_unlock(&tu->qlock); 1236 if (append == 0) 1237 return; 1238 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1239 wake_up(&tu->qchange_sleep); 1240 } 1241 1242 static int snd_timer_user_open(struct inode *inode, struct file *file) 1243 { 1244 struct snd_timer_user *tu; 1245 int err; 1246 1247 err = nonseekable_open(inode, file); 1248 if (err < 0) 1249 return err; 1250 1251 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1252 if (tu == NULL) 1253 return -ENOMEM; 1254 spin_lock_init(&tu->qlock); 1255 init_waitqueue_head(&tu->qchange_sleep); 1256 mutex_init(&tu->tread_sem); 1257 tu->ticks = 1; 1258 tu->queue_size = 128; 1259 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1260 GFP_KERNEL); 1261 if (tu->queue == NULL) { 1262 kfree(tu); 1263 return -ENOMEM; 1264 } 1265 file->private_data = tu; 1266 return 0; 1267 } 1268 1269 static int snd_timer_user_release(struct inode *inode, struct file *file) 1270 { 1271 struct snd_timer_user *tu; 1272 1273 if (file->private_data) { 1274 tu = file->private_data; 1275 file->private_data = NULL; 1276 if (tu->timeri) 1277 snd_timer_close(tu->timeri); 1278 kfree(tu->queue); 1279 kfree(tu->tqueue); 1280 kfree(tu); 1281 } 1282 return 0; 1283 } 1284 1285 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1286 { 1287 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1288 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1289 id->card = -1; 1290 id->device = -1; 1291 id->subdevice = -1; 1292 } 1293 1294 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1295 { 1296 id->dev_class = timer->tmr_class; 1297 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1298 id->card = timer->card ? timer->card->number : -1; 1299 id->device = timer->tmr_device; 1300 id->subdevice = timer->tmr_subdevice; 1301 } 1302 1303 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1304 { 1305 struct snd_timer_id id; 1306 struct snd_timer *timer; 1307 struct list_head *p; 1308 1309 if (copy_from_user(&id, _tid, sizeof(id))) 1310 return -EFAULT; 1311 mutex_lock(®ister_mutex); 1312 if (id.dev_class < 0) { /* first item */ 1313 if (list_empty(&snd_timer_list)) 1314 snd_timer_user_zero_id(&id); 1315 else { 1316 timer = list_entry(snd_timer_list.next, 1317 struct snd_timer, device_list); 1318 snd_timer_user_copy_id(&id, timer); 1319 } 1320 } else { 1321 switch (id.dev_class) { 1322 case SNDRV_TIMER_CLASS_GLOBAL: 1323 id.device = id.device < 0 ? 0 : id.device + 1; 1324 list_for_each(p, &snd_timer_list) { 1325 timer = list_entry(p, struct snd_timer, device_list); 1326 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1327 snd_timer_user_copy_id(&id, timer); 1328 break; 1329 } 1330 if (timer->tmr_device >= id.device) { 1331 snd_timer_user_copy_id(&id, timer); 1332 break; 1333 } 1334 } 1335 if (p == &snd_timer_list) 1336 snd_timer_user_zero_id(&id); 1337 break; 1338 case SNDRV_TIMER_CLASS_CARD: 1339 case SNDRV_TIMER_CLASS_PCM: 1340 if (id.card < 0) { 1341 id.card = 0; 1342 } else { 1343 if (id.card < 0) { 1344 id.card = 0; 1345 } else { 1346 if (id.device < 0) { 1347 id.device = 0; 1348 } else { 1349 if (id.subdevice < 0) { 1350 id.subdevice = 0; 1351 } else { 1352 id.subdevice++; 1353 } 1354 } 1355 } 1356 } 1357 list_for_each(p, &snd_timer_list) { 1358 timer = list_entry(p, struct snd_timer, device_list); 1359 if (timer->tmr_class > id.dev_class) { 1360 snd_timer_user_copy_id(&id, timer); 1361 break; 1362 } 1363 if (timer->tmr_class < id.dev_class) 1364 continue; 1365 if (timer->card->number > id.card) { 1366 snd_timer_user_copy_id(&id, timer); 1367 break; 1368 } 1369 if (timer->card->number < id.card) 1370 continue; 1371 if (timer->tmr_device > id.device) { 1372 snd_timer_user_copy_id(&id, timer); 1373 break; 1374 } 1375 if (timer->tmr_device < id.device) 1376 continue; 1377 if (timer->tmr_subdevice > id.subdevice) { 1378 snd_timer_user_copy_id(&id, timer); 1379 break; 1380 } 1381 if (timer->tmr_subdevice < id.subdevice) 1382 continue; 1383 snd_timer_user_copy_id(&id, timer); 1384 break; 1385 } 1386 if (p == &snd_timer_list) 1387 snd_timer_user_zero_id(&id); 1388 break; 1389 default: 1390 snd_timer_user_zero_id(&id); 1391 } 1392 } 1393 mutex_unlock(®ister_mutex); 1394 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1395 return -EFAULT; 1396 return 0; 1397 } 1398 1399 static int snd_timer_user_ginfo(struct file *file, 1400 struct snd_timer_ginfo __user *_ginfo) 1401 { 1402 struct snd_timer_ginfo *ginfo; 1403 struct snd_timer_id tid; 1404 struct snd_timer *t; 1405 struct list_head *p; 1406 int err = 0; 1407 1408 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1409 if (IS_ERR(ginfo)) 1410 return PTR_ERR(ginfo); 1411 1412 tid = ginfo->tid; 1413 memset(ginfo, 0, sizeof(*ginfo)); 1414 ginfo->tid = tid; 1415 mutex_lock(®ister_mutex); 1416 t = snd_timer_find(&tid); 1417 if (t != NULL) { 1418 ginfo->card = t->card ? t->card->number : -1; 1419 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1420 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1421 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1422 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1423 ginfo->resolution = t->hw.resolution; 1424 if (t->hw.resolution_min > 0) { 1425 ginfo->resolution_min = t->hw.resolution_min; 1426 ginfo->resolution_max = t->hw.resolution_max; 1427 } 1428 list_for_each(p, &t->open_list_head) { 1429 ginfo->clients++; 1430 } 1431 } else { 1432 err = -ENODEV; 1433 } 1434 mutex_unlock(®ister_mutex); 1435 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1436 err = -EFAULT; 1437 kfree(ginfo); 1438 return err; 1439 } 1440 1441 static int snd_timer_user_gparams(struct file *file, 1442 struct snd_timer_gparams __user *_gparams) 1443 { 1444 struct snd_timer_gparams gparams; 1445 struct snd_timer *t; 1446 int err; 1447 1448 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1449 return -EFAULT; 1450 mutex_lock(®ister_mutex); 1451 t = snd_timer_find(&gparams.tid); 1452 if (!t) { 1453 err = -ENODEV; 1454 goto _error; 1455 } 1456 if (!list_empty(&t->open_list_head)) { 1457 err = -EBUSY; 1458 goto _error; 1459 } 1460 if (!t->hw.set_period) { 1461 err = -ENOSYS; 1462 goto _error; 1463 } 1464 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1465 _error: 1466 mutex_unlock(®ister_mutex); 1467 return err; 1468 } 1469 1470 static int snd_timer_user_gstatus(struct file *file, 1471 struct snd_timer_gstatus __user *_gstatus) 1472 { 1473 struct snd_timer_gstatus gstatus; 1474 struct snd_timer_id tid; 1475 struct snd_timer *t; 1476 int err = 0; 1477 1478 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1479 return -EFAULT; 1480 tid = gstatus.tid; 1481 memset(&gstatus, 0, sizeof(gstatus)); 1482 gstatus.tid = tid; 1483 mutex_lock(®ister_mutex); 1484 t = snd_timer_find(&tid); 1485 if (t != NULL) { 1486 if (t->hw.c_resolution) 1487 gstatus.resolution = t->hw.c_resolution(t); 1488 else 1489 gstatus.resolution = t->hw.resolution; 1490 if (t->hw.precise_resolution) { 1491 t->hw.precise_resolution(t, &gstatus.resolution_num, 1492 &gstatus.resolution_den); 1493 } else { 1494 gstatus.resolution_num = gstatus.resolution; 1495 gstatus.resolution_den = 1000000000uL; 1496 } 1497 } else { 1498 err = -ENODEV; 1499 } 1500 mutex_unlock(®ister_mutex); 1501 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1502 err = -EFAULT; 1503 return err; 1504 } 1505 1506 static int snd_timer_user_tselect(struct file *file, 1507 struct snd_timer_select __user *_tselect) 1508 { 1509 struct snd_timer_user *tu; 1510 struct snd_timer_select tselect; 1511 char str[32]; 1512 int err = 0; 1513 1514 tu = file->private_data; 1515 mutex_lock(&tu->tread_sem); 1516 if (tu->timeri) { 1517 snd_timer_close(tu->timeri); 1518 tu->timeri = NULL; 1519 } 1520 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1521 err = -EFAULT; 1522 goto __err; 1523 } 1524 sprintf(str, "application %i", current->pid); 1525 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1526 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1527 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1528 if (err < 0) 1529 goto __err; 1530 1531 kfree(tu->queue); 1532 tu->queue = NULL; 1533 kfree(tu->tqueue); 1534 tu->tqueue = NULL; 1535 if (tu->tread) { 1536 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1537 GFP_KERNEL); 1538 if (tu->tqueue == NULL) 1539 err = -ENOMEM; 1540 } else { 1541 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1542 GFP_KERNEL); 1543 if (tu->queue == NULL) 1544 err = -ENOMEM; 1545 } 1546 1547 if (err < 0) { 1548 snd_timer_close(tu->timeri); 1549 tu->timeri = NULL; 1550 } else { 1551 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1552 tu->timeri->callback = tu->tread 1553 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1554 tu->timeri->ccallback = snd_timer_user_ccallback; 1555 tu->timeri->callback_data = (void *)tu; 1556 } 1557 1558 __err: 1559 mutex_unlock(&tu->tread_sem); 1560 return err; 1561 } 1562 1563 static int snd_timer_user_info(struct file *file, 1564 struct snd_timer_info __user *_info) 1565 { 1566 struct snd_timer_user *tu; 1567 struct snd_timer_info *info; 1568 struct snd_timer *t; 1569 int err = 0; 1570 1571 tu = file->private_data; 1572 if (!tu->timeri) 1573 return -EBADFD; 1574 t = tu->timeri->timer; 1575 if (!t) 1576 return -EBADFD; 1577 1578 info = kzalloc(sizeof(*info), GFP_KERNEL); 1579 if (! info) 1580 return -ENOMEM; 1581 info->card = t->card ? t->card->number : -1; 1582 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1583 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1584 strlcpy(info->id, t->id, sizeof(info->id)); 1585 strlcpy(info->name, t->name, sizeof(info->name)); 1586 info->resolution = t->hw.resolution; 1587 if (copy_to_user(_info, info, sizeof(*_info))) 1588 err = -EFAULT; 1589 kfree(info); 1590 return err; 1591 } 1592 1593 static int snd_timer_user_params(struct file *file, 1594 struct snd_timer_params __user *_params) 1595 { 1596 struct snd_timer_user *tu; 1597 struct snd_timer_params params; 1598 struct snd_timer *t; 1599 struct snd_timer_read *tr; 1600 struct snd_timer_tread *ttr; 1601 int err; 1602 1603 tu = file->private_data; 1604 if (!tu->timeri) 1605 return -EBADFD; 1606 t = tu->timeri->timer; 1607 if (!t) 1608 return -EBADFD; 1609 if (copy_from_user(¶ms, _params, sizeof(params))) 1610 return -EFAULT; 1611 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1612 err = -EINVAL; 1613 goto _end; 1614 } 1615 if (params.queue_size > 0 && 1616 (params.queue_size < 32 || params.queue_size > 1024)) { 1617 err = -EINVAL; 1618 goto _end; 1619 } 1620 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1621 (1<<SNDRV_TIMER_EVENT_TICK)| 1622 (1<<SNDRV_TIMER_EVENT_START)| 1623 (1<<SNDRV_TIMER_EVENT_STOP)| 1624 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1625 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1626 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1627 (1<<SNDRV_TIMER_EVENT_RESUME)| 1628 (1<<SNDRV_TIMER_EVENT_MSTART)| 1629 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1630 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1631 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1632 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1633 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1634 err = -EINVAL; 1635 goto _end; 1636 } 1637 snd_timer_stop(tu->timeri); 1638 spin_lock_irq(&t->lock); 1639 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1640 SNDRV_TIMER_IFLG_EXCLUSIVE| 1641 SNDRV_TIMER_IFLG_EARLY_EVENT); 1642 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1643 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1644 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1645 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1646 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1648 spin_unlock_irq(&t->lock); 1649 if (params.queue_size > 0 && 1650 (unsigned int)tu->queue_size != params.queue_size) { 1651 if (tu->tread) { 1652 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1653 GFP_KERNEL); 1654 if (ttr) { 1655 kfree(tu->tqueue); 1656 tu->queue_size = params.queue_size; 1657 tu->tqueue = ttr; 1658 } 1659 } else { 1660 tr = kmalloc(params.queue_size * sizeof(*tr), 1661 GFP_KERNEL); 1662 if (tr) { 1663 kfree(tu->queue); 1664 tu->queue_size = params.queue_size; 1665 tu->queue = tr; 1666 } 1667 } 1668 } 1669 tu->qhead = tu->qtail = tu->qused = 0; 1670 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1671 if (tu->tread) { 1672 struct snd_timer_tread tread; 1673 tread.event = SNDRV_TIMER_EVENT_EARLY; 1674 tread.tstamp.tv_sec = 0; 1675 tread.tstamp.tv_nsec = 0; 1676 tread.val = 0; 1677 snd_timer_user_append_to_tqueue(tu, &tread); 1678 } else { 1679 struct snd_timer_read *r = &tu->queue[0]; 1680 r->resolution = 0; 1681 r->ticks = 0; 1682 tu->qused++; 1683 tu->qtail++; 1684 } 1685 } 1686 tu->filter = params.filter; 1687 tu->ticks = params.ticks; 1688 err = 0; 1689 _end: 1690 if (copy_to_user(_params, ¶ms, sizeof(params))) 1691 return -EFAULT; 1692 return err; 1693 } 1694 1695 static int snd_timer_user_status(struct file *file, 1696 struct snd_timer_status __user *_status) 1697 { 1698 struct snd_timer_user *tu; 1699 struct snd_timer_status status; 1700 1701 tu = file->private_data; 1702 if (!tu->timeri) 1703 return -EBADFD; 1704 memset(&status, 0, sizeof(status)); 1705 status.tstamp = tu->tstamp; 1706 status.resolution = snd_timer_resolution(tu->timeri); 1707 status.lost = tu->timeri->lost; 1708 status.overrun = tu->overrun; 1709 spin_lock_irq(&tu->qlock); 1710 status.queue = tu->qused; 1711 spin_unlock_irq(&tu->qlock); 1712 if (copy_to_user(_status, &status, sizeof(status))) 1713 return -EFAULT; 1714 return 0; 1715 } 1716 1717 static int snd_timer_user_start(struct file *file) 1718 { 1719 int err; 1720 struct snd_timer_user *tu; 1721 1722 tu = file->private_data; 1723 if (!tu->timeri) 1724 return -EBADFD; 1725 snd_timer_stop(tu->timeri); 1726 tu->timeri->lost = 0; 1727 tu->last_resolution = 0; 1728 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1729 } 1730 1731 static int snd_timer_user_stop(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 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1740 } 1741 1742 static int snd_timer_user_continue(struct file *file) 1743 { 1744 int err; 1745 struct snd_timer_user *tu; 1746 1747 tu = file->private_data; 1748 if (!tu->timeri) 1749 return -EBADFD; 1750 tu->timeri->lost = 0; 1751 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1752 } 1753 1754 static int snd_timer_user_pause(struct file *file) 1755 { 1756 int err; 1757 struct snd_timer_user *tu; 1758 1759 tu = file->private_data; 1760 if (!tu->timeri) 1761 return -EBADFD; 1762 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1763 } 1764 1765 enum { 1766 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1767 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1768 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1769 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1770 }; 1771 1772 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1773 unsigned long arg) 1774 { 1775 struct snd_timer_user *tu; 1776 void __user *argp = (void __user *)arg; 1777 int __user *p = argp; 1778 1779 tu = file->private_data; 1780 switch (cmd) { 1781 case SNDRV_TIMER_IOCTL_PVERSION: 1782 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1783 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1784 return snd_timer_user_next_device(argp); 1785 case SNDRV_TIMER_IOCTL_TREAD: 1786 { 1787 int xarg; 1788 1789 mutex_lock(&tu->tread_sem); 1790 if (tu->timeri) { /* too late */ 1791 mutex_unlock(&tu->tread_sem); 1792 return -EBUSY; 1793 } 1794 if (get_user(xarg, p)) { 1795 mutex_unlock(&tu->tread_sem); 1796 return -EFAULT; 1797 } 1798 tu->tread = xarg ? 1 : 0; 1799 mutex_unlock(&tu->tread_sem); 1800 return 0; 1801 } 1802 case SNDRV_TIMER_IOCTL_GINFO: 1803 return snd_timer_user_ginfo(file, argp); 1804 case SNDRV_TIMER_IOCTL_GPARAMS: 1805 return snd_timer_user_gparams(file, argp); 1806 case SNDRV_TIMER_IOCTL_GSTATUS: 1807 return snd_timer_user_gstatus(file, argp); 1808 case SNDRV_TIMER_IOCTL_SELECT: 1809 return snd_timer_user_tselect(file, argp); 1810 case SNDRV_TIMER_IOCTL_INFO: 1811 return snd_timer_user_info(file, argp); 1812 case SNDRV_TIMER_IOCTL_PARAMS: 1813 return snd_timer_user_params(file, argp); 1814 case SNDRV_TIMER_IOCTL_STATUS: 1815 return snd_timer_user_status(file, argp); 1816 case SNDRV_TIMER_IOCTL_START: 1817 case SNDRV_TIMER_IOCTL_START_OLD: 1818 return snd_timer_user_start(file); 1819 case SNDRV_TIMER_IOCTL_STOP: 1820 case SNDRV_TIMER_IOCTL_STOP_OLD: 1821 return snd_timer_user_stop(file); 1822 case SNDRV_TIMER_IOCTL_CONTINUE: 1823 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1824 return snd_timer_user_continue(file); 1825 case SNDRV_TIMER_IOCTL_PAUSE: 1826 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1827 return snd_timer_user_pause(file); 1828 } 1829 return -ENOTTY; 1830 } 1831 1832 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1833 { 1834 struct snd_timer_user *tu; 1835 1836 tu = file->private_data; 1837 return fasync_helper(fd, file, on, &tu->fasync); 1838 } 1839 1840 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1841 size_t count, loff_t *offset) 1842 { 1843 struct snd_timer_user *tu; 1844 long result = 0, unit; 1845 int err = 0; 1846 1847 tu = file->private_data; 1848 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1849 spin_lock_irq(&tu->qlock); 1850 while ((long)count - result >= unit) { 1851 while (!tu->qused) { 1852 wait_queue_t wait; 1853 1854 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1855 err = -EAGAIN; 1856 break; 1857 } 1858 1859 set_current_state(TASK_INTERRUPTIBLE); 1860 init_waitqueue_entry(&wait, current); 1861 add_wait_queue(&tu->qchange_sleep, &wait); 1862 1863 spin_unlock_irq(&tu->qlock); 1864 schedule(); 1865 spin_lock_irq(&tu->qlock); 1866 1867 remove_wait_queue(&tu->qchange_sleep, &wait); 1868 1869 if (signal_pending(current)) { 1870 err = -ERESTARTSYS; 1871 break; 1872 } 1873 } 1874 1875 spin_unlock_irq(&tu->qlock); 1876 if (err < 0) 1877 goto _error; 1878 1879 if (tu->tread) { 1880 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1881 sizeof(struct snd_timer_tread))) { 1882 err = -EFAULT; 1883 goto _error; 1884 } 1885 } else { 1886 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1887 sizeof(struct snd_timer_read))) { 1888 err = -EFAULT; 1889 goto _error; 1890 } 1891 } 1892 1893 tu->qhead %= tu->queue_size; 1894 1895 result += unit; 1896 buffer += unit; 1897 1898 spin_lock_irq(&tu->qlock); 1899 tu->qused--; 1900 } 1901 spin_unlock_irq(&tu->qlock); 1902 _error: 1903 return result > 0 ? result : err; 1904 } 1905 1906 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1907 { 1908 unsigned int mask; 1909 struct snd_timer_user *tu; 1910 1911 tu = file->private_data; 1912 1913 poll_wait(file, &tu->qchange_sleep, wait); 1914 1915 mask = 0; 1916 if (tu->qused) 1917 mask |= POLLIN | POLLRDNORM; 1918 1919 return mask; 1920 } 1921 1922 #ifdef CONFIG_COMPAT 1923 #include "timer_compat.c" 1924 #else 1925 #define snd_timer_user_ioctl_compat NULL 1926 #endif 1927 1928 static const struct file_operations snd_timer_f_ops = 1929 { 1930 .owner = THIS_MODULE, 1931 .read = snd_timer_user_read, 1932 .open = snd_timer_user_open, 1933 .release = snd_timer_user_release, 1934 .llseek = no_llseek, 1935 .poll = snd_timer_user_poll, 1936 .unlocked_ioctl = snd_timer_user_ioctl, 1937 .compat_ioctl = snd_timer_user_ioctl_compat, 1938 .fasync = snd_timer_user_fasync, 1939 }; 1940 1941 /* unregister the system timer */ 1942 static void snd_timer_free_all(void) 1943 { 1944 struct snd_timer *timer, *n; 1945 1946 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 1947 snd_timer_free(timer); 1948 } 1949 1950 static struct device timer_dev; 1951 1952 /* 1953 * ENTRY functions 1954 */ 1955 1956 static int __init alsa_timer_init(void) 1957 { 1958 int err; 1959 1960 snd_device_initialize(&timer_dev, NULL); 1961 dev_set_name(&timer_dev, "timer"); 1962 1963 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1964 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1965 "system timer"); 1966 #endif 1967 1968 err = snd_timer_register_system(); 1969 if (err < 0) { 1970 pr_err("ALSA: unable to register system timer (%i)\n", err); 1971 put_device(&timer_dev); 1972 return err; 1973 } 1974 1975 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1976 &snd_timer_f_ops, NULL, &timer_dev); 1977 if (err < 0) { 1978 pr_err("ALSA: unable to register timer device (%i)\n", err); 1979 snd_timer_free_all(); 1980 put_device(&timer_dev); 1981 return err; 1982 } 1983 1984 snd_timer_proc_init(); 1985 return 0; 1986 } 1987 1988 static void __exit alsa_timer_exit(void) 1989 { 1990 snd_unregister_device(&timer_dev); 1991 snd_timer_free_all(); 1992 put_device(&timer_dev); 1993 snd_timer_proc_done(); 1994 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1995 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1996 #endif 1997 } 1998 1999 module_init(alsa_timer_init) 2000 module_exit(alsa_timer_exit) 2001 2002 EXPORT_SYMBOL(snd_timer_open); 2003 EXPORT_SYMBOL(snd_timer_close); 2004 EXPORT_SYMBOL(snd_timer_resolution); 2005 EXPORT_SYMBOL(snd_timer_start); 2006 EXPORT_SYMBOL(snd_timer_stop); 2007 EXPORT_SYMBOL(snd_timer_continue); 2008 EXPORT_SYMBOL(snd_timer_pause); 2009 EXPORT_SYMBOL(snd_timer_new); 2010 EXPORT_SYMBOL(snd_timer_notify); 2011 EXPORT_SYMBOL(snd_timer_global_new); 2012 EXPORT_SYMBOL(snd_timer_global_free); 2013 EXPORT_SYMBOL(snd_timer_global_register); 2014 EXPORT_SYMBOL(snd_timer_interrupt); 2015