1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> 23 #include <linux/delay.h> 24 #include <linux/init.h> 25 #include <linux/smp_lock.h> 26 #include <linux/slab.h> 27 #include <linux/time.h> 28 #include <linux/mutex.h> 29 #include <linux/moduleparam.h> 30 #include <linux/string.h> 31 #include <sound/core.h> 32 #include <sound/timer.h> 33 #include <sound/control.h> 34 #include <sound/info.h> 35 #include <sound/minors.h> 36 #include <sound/initval.h> 37 #include <linux/kmod.h> 38 #ifdef CONFIG_KERNELD 39 #include <linux/kerneld.h> 40 #endif 41 42 #if defined(CONFIG_SND_HPET) || defined(CONFIG_SND_HPET_MODULE) 43 #define DEFAULT_TIMER_LIMIT 3 44 #elif defined(CONFIG_SND_RTCTIMER) || defined(CONFIG_SND_RTCTIMER_MODULE) 45 #define DEFAULT_TIMER_LIMIT 2 46 #else 47 #define DEFAULT_TIMER_LIMIT 1 48 #endif 49 50 static int timer_limit = DEFAULT_TIMER_LIMIT; 51 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Takashi Iwai <tiwai@suse.de>"); 52 MODULE_DESCRIPTION("ALSA timer interface"); 53 MODULE_LICENSE("GPL"); 54 module_param(timer_limit, int, 0444); 55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 56 57 struct snd_timer_user { 58 struct snd_timer_instance *timeri; 59 int tread; /* enhanced read with timestamps and events */ 60 unsigned long ticks; 61 unsigned long overrun; 62 int qhead; 63 int qtail; 64 int qused; 65 int queue_size; 66 struct snd_timer_read *queue; 67 struct snd_timer_tread *tqueue; 68 spinlock_t qlock; 69 unsigned long last_resolution; 70 unsigned int filter; 71 struct timespec tstamp; /* trigger tstamp */ 72 wait_queue_head_t qchange_sleep; 73 struct fasync_struct *fasync; 74 struct mutex tread_sem; 75 }; 76 77 /* list of timers */ 78 static LIST_HEAD(snd_timer_list); 79 80 /* list of slave instances */ 81 static LIST_HEAD(snd_timer_slave_list); 82 83 /* lock for slave active lists */ 84 static DEFINE_SPINLOCK(slave_active_lock); 85 86 static DEFINE_MUTEX(register_mutex); 87 88 static int snd_timer_free(struct snd_timer *timer); 89 static int snd_timer_dev_free(struct snd_device *device); 90 static int snd_timer_dev_register(struct snd_device *device); 91 static int snd_timer_dev_unregister(struct snd_device *device); 92 93 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 94 95 /* 96 * create a timer instance with the given owner string. 97 * when timer is not NULL, increments the module counter 98 */ 99 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 100 struct snd_timer *timer) 101 { 102 struct snd_timer_instance *timeri; 103 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 104 if (timeri == NULL) 105 return NULL; 106 timeri->owner = kstrdup(owner, GFP_KERNEL); 107 if (! timeri->owner) { 108 kfree(timeri); 109 return NULL; 110 } 111 INIT_LIST_HEAD(&timeri->open_list); 112 INIT_LIST_HEAD(&timeri->active_list); 113 INIT_LIST_HEAD(&timeri->ack_list); 114 INIT_LIST_HEAD(&timeri->slave_list_head); 115 INIT_LIST_HEAD(&timeri->slave_active_head); 116 117 timeri->timer = timer; 118 if (timer && !try_module_get(timer->module)) { 119 kfree(timeri->owner); 120 kfree(timeri); 121 return NULL; 122 } 123 124 return timeri; 125 } 126 127 /* 128 * find a timer instance from the given timer id 129 */ 130 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 131 { 132 struct snd_timer *timer = NULL; 133 struct list_head *p; 134 135 list_for_each(p, &snd_timer_list) { 136 timer = list_entry(p, struct snd_timer, device_list); 137 138 if (timer->tmr_class != tid->dev_class) 139 continue; 140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 142 (timer->card == NULL || 143 timer->card->number != tid->card)) 144 continue; 145 if (timer->tmr_device != tid->device) 146 continue; 147 if (timer->tmr_subdevice != tid->subdevice) 148 continue; 149 return timer; 150 } 151 return NULL; 152 } 153 154 #ifdef CONFIG_KMOD 155 156 static void snd_timer_request(struct snd_timer_id *tid) 157 { 158 if (! current->fs->root) 159 return; 160 switch (tid->dev_class) { 161 case SNDRV_TIMER_CLASS_GLOBAL: 162 if (tid->device < timer_limit) 163 request_module("snd-timer-%i", tid->device); 164 break; 165 case SNDRV_TIMER_CLASS_CARD: 166 case SNDRV_TIMER_CLASS_PCM: 167 if (tid->card < snd_ecards_limit) 168 request_module("snd-card-%i", tid->card); 169 break; 170 default: 171 break; 172 } 173 } 174 175 #endif 176 177 /* 178 * look for a master instance matching with the slave id of the given slave. 179 * when found, relink the open_link of the slave. 180 * 181 * call this with register_mutex down. 182 */ 183 static void snd_timer_check_slave(struct snd_timer_instance *slave) 184 { 185 struct snd_timer *timer; 186 struct snd_timer_instance *master; 187 struct list_head *p, *q; 188 189 /* FIXME: it's really dumb to look up all entries.. */ 190 list_for_each(p, &snd_timer_list) { 191 timer = list_entry(p, struct snd_timer, device_list); 192 list_for_each(q, &timer->open_list_head) { 193 master = list_entry(q, struct snd_timer_instance, open_list); 194 if (slave->slave_class == master->slave_class && 195 slave->slave_id == master->slave_id) { 196 list_del(&slave->open_list); 197 list_add_tail(&slave->open_list, 198 &master->slave_list_head); 199 spin_lock_irq(&slave_active_lock); 200 slave->master = master; 201 slave->timer = master->timer; 202 spin_unlock_irq(&slave_active_lock); 203 return; 204 } 205 } 206 } 207 } 208 209 /* 210 * look for slave instances matching with the slave id of the given master. 211 * when found, relink the open_link of slaves. 212 * 213 * call this with register_mutex down. 214 */ 215 static void snd_timer_check_master(struct snd_timer_instance *master) 216 { 217 struct snd_timer_instance *slave; 218 struct list_head *p, *n; 219 220 /* check all pending slaves */ 221 list_for_each_safe(p, n, &snd_timer_slave_list) { 222 slave = list_entry(p, struct snd_timer_instance, open_list); 223 if (slave->slave_class == master->slave_class && 224 slave->slave_id == master->slave_id) { 225 list_del(p); 226 list_add_tail(p, &master->slave_list_head); 227 spin_lock_irq(&slave_active_lock); 228 slave->master = master; 229 slave->timer = master->timer; 230 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 231 list_add_tail(&slave->active_list, 232 &master->slave_active_head); 233 spin_unlock_irq(&slave_active_lock); 234 } 235 } 236 } 237 238 /* 239 * open a timer instance 240 * when opening a master, the slave id must be here given. 241 */ 242 int snd_timer_open(struct snd_timer_instance **ti, 243 char *owner, struct snd_timer_id *tid, 244 unsigned int slave_id) 245 { 246 struct snd_timer *timer; 247 struct snd_timer_instance *timeri = NULL; 248 249 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 250 /* open a slave instance */ 251 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 252 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 253 snd_printd("invalid slave class %i\n", tid->dev_sclass); 254 return -EINVAL; 255 } 256 mutex_lock(®ister_mutex); 257 timeri = snd_timer_instance_new(owner, NULL); 258 if (!timeri) { 259 mutex_unlock(®ister_mutex); 260 return -ENOMEM; 261 } 262 timeri->slave_class = tid->dev_sclass; 263 timeri->slave_id = tid->device; 264 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 265 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 266 snd_timer_check_slave(timeri); 267 mutex_unlock(®ister_mutex); 268 *ti = timeri; 269 return 0; 270 } 271 272 /* open a master instance */ 273 mutex_lock(®ister_mutex); 274 timer = snd_timer_find(tid); 275 #ifdef CONFIG_KMOD 276 if (timer == NULL) { 277 mutex_unlock(®ister_mutex); 278 snd_timer_request(tid); 279 mutex_lock(®ister_mutex); 280 timer = snd_timer_find(tid); 281 } 282 #endif 283 if (!timer) { 284 mutex_unlock(®ister_mutex); 285 return -ENODEV; 286 } 287 if (!list_empty(&timer->open_list_head)) { 288 timeri = list_entry(timer->open_list_head.next, 289 struct snd_timer_instance, open_list); 290 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 291 mutex_unlock(®ister_mutex); 292 return -EBUSY; 293 } 294 } 295 timeri = snd_timer_instance_new(owner, timer); 296 if (!timeri) { 297 mutex_unlock(®ister_mutex); 298 return -ENOMEM; 299 } 300 timeri->slave_class = tid->dev_sclass; 301 timeri->slave_id = slave_id; 302 if (list_empty(&timer->open_list_head) && timer->hw.open) 303 timer->hw.open(timer); 304 list_add_tail(&timeri->open_list, &timer->open_list_head); 305 snd_timer_check_master(timeri); 306 mutex_unlock(®ister_mutex); 307 *ti = timeri; 308 return 0; 309 } 310 311 static int _snd_timer_stop(struct snd_timer_instance *timeri, 312 int keep_flag, int event); 313 314 /* 315 * close a timer instance 316 */ 317 int snd_timer_close(struct snd_timer_instance *timeri) 318 { 319 struct snd_timer *timer = NULL; 320 struct list_head *p, *n; 321 struct snd_timer_instance *slave; 322 323 snd_assert(timeri != NULL, return -ENXIO); 324 325 /* force to stop the timer */ 326 snd_timer_stop(timeri); 327 328 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 329 /* wait, until the active callback is finished */ 330 spin_lock_irq(&slave_active_lock); 331 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 332 spin_unlock_irq(&slave_active_lock); 333 udelay(10); 334 spin_lock_irq(&slave_active_lock); 335 } 336 spin_unlock_irq(&slave_active_lock); 337 mutex_lock(®ister_mutex); 338 list_del(&timeri->open_list); 339 mutex_unlock(®ister_mutex); 340 } else { 341 timer = timeri->timer; 342 /* wait, until the active callback is finished */ 343 spin_lock_irq(&timer->lock); 344 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 345 spin_unlock_irq(&timer->lock); 346 udelay(10); 347 spin_lock_irq(&timer->lock); 348 } 349 spin_unlock_irq(&timer->lock); 350 mutex_lock(®ister_mutex); 351 list_del(&timeri->open_list); 352 if (timer && list_empty(&timer->open_list_head) && 353 timer->hw.close) 354 timer->hw.close(timer); 355 /* remove slave links */ 356 list_for_each_safe(p, n, &timeri->slave_list_head) { 357 slave = list_entry(p, struct snd_timer_instance, open_list); 358 spin_lock_irq(&slave_active_lock); 359 _snd_timer_stop(slave, 1, SNDRV_TIMER_EVENT_RESOLUTION); 360 list_del(p); 361 list_add_tail(p, &snd_timer_slave_list); 362 slave->master = NULL; 363 slave->timer = NULL; 364 spin_unlock_irq(&slave_active_lock); 365 } 366 mutex_unlock(®ister_mutex); 367 } 368 if (timeri->private_free) 369 timeri->private_free(timeri); 370 kfree(timeri->owner); 371 kfree(timeri); 372 if (timer) 373 module_put(timer->module); 374 return 0; 375 } 376 377 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 378 { 379 struct snd_timer * timer; 380 381 if (timeri == NULL) 382 return 0; 383 if ((timer = timeri->timer) != NULL) { 384 if (timer->hw.c_resolution) 385 return timer->hw.c_resolution(timer); 386 return timer->hw.resolution; 387 } 388 return 0; 389 } 390 391 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 392 { 393 struct snd_timer *timer; 394 unsigned long flags; 395 unsigned long resolution = 0; 396 struct snd_timer_instance *ts; 397 struct list_head *n; 398 struct timespec tstamp; 399 400 getnstimeofday(&tstamp); 401 snd_assert(event >= SNDRV_TIMER_EVENT_START && 402 event <= SNDRV_TIMER_EVENT_PAUSE, return); 403 if (event == SNDRV_TIMER_EVENT_START || 404 event == SNDRV_TIMER_EVENT_CONTINUE) 405 resolution = snd_timer_resolution(ti); 406 if (ti->ccallback) 407 ti->ccallback(ti, SNDRV_TIMER_EVENT_START, &tstamp, resolution); 408 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 409 return; 410 timer = ti->timer; 411 if (timer == NULL) 412 return; 413 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 414 return; 415 spin_lock_irqsave(&timer->lock, flags); 416 list_for_each(n, &ti->slave_active_head) { 417 ts = list_entry(n, struct snd_timer_instance, active_list); 418 if (ts->ccallback) 419 ts->ccallback(ti, event + 100, &tstamp, resolution); 420 } 421 spin_unlock_irqrestore(&timer->lock, flags); 422 } 423 424 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 425 unsigned long sticks) 426 { 427 list_del(&timeri->active_list); 428 list_add_tail(&timeri->active_list, &timer->active_list_head); 429 if (timer->running) { 430 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 431 goto __start_now; 432 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 433 timeri->flags |= SNDRV_TIMER_IFLG_START; 434 return 1; /* delayed start */ 435 } else { 436 timer->sticks = sticks; 437 timer->hw.start(timer); 438 __start_now: 439 timer->running++; 440 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 441 return 0; 442 } 443 } 444 445 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 446 { 447 unsigned long flags; 448 449 spin_lock_irqsave(&slave_active_lock, flags); 450 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 451 if (timeri->master) 452 list_add_tail(&timeri->active_list, 453 &timeri->master->slave_active_head); 454 spin_unlock_irqrestore(&slave_active_lock, flags); 455 return 1; /* delayed start */ 456 } 457 458 /* 459 * start the timer instance 460 */ 461 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 462 { 463 struct snd_timer *timer; 464 int result = -EINVAL; 465 unsigned long flags; 466 467 if (timeri == NULL || ticks < 1) 468 return -EINVAL; 469 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 470 result = snd_timer_start_slave(timeri); 471 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 472 return result; 473 } 474 timer = timeri->timer; 475 if (timer == NULL) 476 return -EINVAL; 477 spin_lock_irqsave(&timer->lock, flags); 478 timeri->ticks = timeri->cticks = ticks; 479 timeri->pticks = 0; 480 result = snd_timer_start1(timer, timeri, ticks); 481 spin_unlock_irqrestore(&timer->lock, flags); 482 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 483 return result; 484 } 485 486 static int _snd_timer_stop(struct snd_timer_instance * timeri, 487 int keep_flag, int event) 488 { 489 struct snd_timer *timer; 490 unsigned long flags; 491 492 snd_assert(timeri != NULL, return -ENXIO); 493 494 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 495 if (!keep_flag) { 496 spin_lock_irqsave(&slave_active_lock, flags); 497 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 498 spin_unlock_irqrestore(&slave_active_lock, flags); 499 } 500 goto __end; 501 } 502 timer = timeri->timer; 503 if (!timer) 504 return -EINVAL; 505 spin_lock_irqsave(&timer->lock, flags); 506 list_del_init(&timeri->ack_list); 507 list_del_init(&timeri->active_list); 508 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 509 !(--timer->running)) { 510 timer->hw.stop(timer); 511 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 512 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 513 snd_timer_reschedule(timer, 0); 514 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 515 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 516 timer->hw.start(timer); 517 } 518 } 519 } 520 if (!keep_flag) 521 timeri->flags &= 522 ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 523 spin_unlock_irqrestore(&timer->lock, flags); 524 __end: 525 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 526 snd_timer_notify1(timeri, event); 527 return 0; 528 } 529 530 /* 531 * stop the timer instance. 532 * 533 * do not call this from the timer callback! 534 */ 535 int snd_timer_stop(struct snd_timer_instance *timeri) 536 { 537 struct snd_timer *timer; 538 unsigned long flags; 539 int err; 540 541 err = _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_STOP); 542 if (err < 0) 543 return err; 544 timer = timeri->timer; 545 spin_lock_irqsave(&timer->lock, flags); 546 timeri->cticks = timeri->ticks; 547 timeri->pticks = 0; 548 spin_unlock_irqrestore(&timer->lock, flags); 549 return 0; 550 } 551 552 /* 553 * start again.. the tick is kept. 554 */ 555 int snd_timer_continue(struct snd_timer_instance *timeri) 556 { 557 struct snd_timer *timer; 558 int result = -EINVAL; 559 unsigned long flags; 560 561 if (timeri == NULL) 562 return result; 563 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 564 return snd_timer_start_slave(timeri); 565 timer = timeri->timer; 566 if (! timer) 567 return -EINVAL; 568 spin_lock_irqsave(&timer->lock, flags); 569 if (!timeri->cticks) 570 timeri->cticks = 1; 571 timeri->pticks = 0; 572 result = snd_timer_start1(timer, timeri, timer->sticks); 573 spin_unlock_irqrestore(&timer->lock, flags); 574 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 575 return result; 576 } 577 578 /* 579 * pause.. remember the ticks left 580 */ 581 int snd_timer_pause(struct snd_timer_instance * timeri) 582 { 583 return _snd_timer_stop(timeri, 0, SNDRV_TIMER_EVENT_PAUSE); 584 } 585 586 /* 587 * reschedule the timer 588 * 589 * start pending instances and check the scheduling ticks. 590 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 591 */ 592 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 593 { 594 struct snd_timer_instance *ti; 595 unsigned long ticks = ~0UL; 596 struct list_head *p; 597 598 list_for_each(p, &timer->active_list_head) { 599 ti = list_entry(p, struct snd_timer_instance, active_list); 600 if (ti->flags & SNDRV_TIMER_IFLG_START) { 601 ti->flags &= ~SNDRV_TIMER_IFLG_START; 602 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 603 timer->running++; 604 } 605 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 606 if (ticks > ti->cticks) 607 ticks = ti->cticks; 608 } 609 } 610 if (ticks == ~0UL) { 611 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 612 return; 613 } 614 if (ticks > timer->hw.ticks) 615 ticks = timer->hw.ticks; 616 if (ticks_left != ticks) 617 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 618 timer->sticks = ticks; 619 } 620 621 /* 622 * timer tasklet 623 * 624 */ 625 static void snd_timer_tasklet(unsigned long arg) 626 { 627 struct snd_timer *timer = (struct snd_timer *) arg; 628 struct snd_timer_instance *ti; 629 struct list_head *p; 630 unsigned long resolution, ticks; 631 632 spin_lock(&timer->lock); 633 /* now process all callbacks */ 634 while (!list_empty(&timer->sack_list_head)) { 635 p = timer->sack_list_head.next; /* get first item */ 636 ti = list_entry(p, struct snd_timer_instance, ack_list); 637 638 /* remove from ack_list and make empty */ 639 list_del_init(p); 640 641 ticks = ti->pticks; 642 ti->pticks = 0; 643 resolution = ti->resolution; 644 645 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 646 spin_unlock(&timer->lock); 647 if (ti->callback) 648 ti->callback(ti, resolution, ticks); 649 spin_lock(&timer->lock); 650 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 651 } 652 spin_unlock(&timer->lock); 653 } 654 655 /* 656 * timer interrupt 657 * 658 * ticks_left is usually equal to timer->sticks. 659 * 660 */ 661 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 662 { 663 struct snd_timer_instance *ti, *ts; 664 unsigned long resolution, ticks; 665 struct list_head *p, *q, *n, *ack_list_head; 666 unsigned long flags; 667 int use_tasklet = 0; 668 669 if (timer == NULL) 670 return; 671 672 spin_lock_irqsave(&timer->lock, flags); 673 674 /* remember the current resolution */ 675 if (timer->hw.c_resolution) 676 resolution = timer->hw.c_resolution(timer); 677 else 678 resolution = timer->hw.resolution; 679 680 /* loop for all active instances 681 * Here we cannot use list_for_each because the active_list of a 682 * processed instance is relinked to done_list_head before the callback 683 * is called. 684 */ 685 list_for_each_safe(p, n, &timer->active_list_head) { 686 ti = list_entry(p, struct snd_timer_instance, active_list); 687 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 688 continue; 689 ti->pticks += ticks_left; 690 ti->resolution = resolution; 691 if (ti->cticks < ticks_left) 692 ti->cticks = 0; 693 else 694 ti->cticks -= ticks_left; 695 if (ti->cticks) /* not expired */ 696 continue; 697 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 698 ti->cticks = ti->ticks; 699 } else { 700 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 701 if (--timer->running) 702 list_del(p); 703 } 704 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 705 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 706 ack_list_head = &timer->ack_list_head; 707 else 708 ack_list_head = &timer->sack_list_head; 709 if (list_empty(&ti->ack_list)) 710 list_add_tail(&ti->ack_list, ack_list_head); 711 list_for_each(q, &ti->slave_active_head) { 712 ts = list_entry(q, struct snd_timer_instance, active_list); 713 ts->pticks = ti->pticks; 714 ts->resolution = resolution; 715 if (list_empty(&ts->ack_list)) 716 list_add_tail(&ts->ack_list, ack_list_head); 717 } 718 } 719 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 720 snd_timer_reschedule(timer, ticks_left); 721 if (timer->running) { 722 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 723 timer->hw.stop(timer); 724 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 725 } 726 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 727 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 728 /* restart timer */ 729 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 730 timer->hw.start(timer); 731 } 732 } else { 733 timer->hw.stop(timer); 734 } 735 736 /* now process all fast callbacks */ 737 while (!list_empty(&timer->ack_list_head)) { 738 p = timer->ack_list_head.next; /* get first item */ 739 ti = list_entry(p, struct snd_timer_instance, ack_list); 740 741 /* remove from ack_list and make empty */ 742 list_del_init(p); 743 744 ticks = ti->pticks; 745 ti->pticks = 0; 746 747 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 748 spin_unlock(&timer->lock); 749 if (ti->callback) 750 ti->callback(ti, resolution, ticks); 751 spin_lock(&timer->lock); 752 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 753 } 754 755 /* do we have any slow callbacks? */ 756 use_tasklet = !list_empty(&timer->sack_list_head); 757 spin_unlock_irqrestore(&timer->lock, flags); 758 759 if (use_tasklet) 760 tasklet_hi_schedule(&timer->task_queue); 761 } 762 763 /* 764 765 */ 766 767 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 768 struct snd_timer **rtimer) 769 { 770 struct snd_timer *timer; 771 int err; 772 static struct snd_device_ops ops = { 773 .dev_free = snd_timer_dev_free, 774 .dev_register = snd_timer_dev_register, 775 .dev_unregister = snd_timer_dev_unregister 776 }; 777 778 snd_assert(tid != NULL, return -EINVAL); 779 snd_assert(rtimer != NULL, return -EINVAL); 780 *rtimer = NULL; 781 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 782 if (timer == NULL) { 783 snd_printk(KERN_ERR "timer: cannot allocate\n"); 784 return -ENOMEM; 785 } 786 timer->tmr_class = tid->dev_class; 787 timer->card = card; 788 timer->tmr_device = tid->device; 789 timer->tmr_subdevice = tid->subdevice; 790 if (id) 791 strlcpy(timer->id, id, sizeof(timer->id)); 792 INIT_LIST_HEAD(&timer->device_list); 793 INIT_LIST_HEAD(&timer->open_list_head); 794 INIT_LIST_HEAD(&timer->active_list_head); 795 INIT_LIST_HEAD(&timer->ack_list_head); 796 INIT_LIST_HEAD(&timer->sack_list_head); 797 spin_lock_init(&timer->lock); 798 tasklet_init(&timer->task_queue, snd_timer_tasklet, 799 (unsigned long)timer); 800 if (card != NULL) { 801 timer->module = card->module; 802 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 803 if (err < 0) { 804 snd_timer_free(timer); 805 return err; 806 } 807 } 808 *rtimer = timer; 809 return 0; 810 } 811 812 static int snd_timer_free(struct snd_timer *timer) 813 { 814 snd_assert(timer != NULL, return -ENXIO); 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 struct list_head *p; 832 833 snd_assert(timer != NULL && timer->hw.start != NULL && 834 timer->hw.stop != NULL, return -ENXIO); 835 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 836 !timer->hw.resolution && timer->hw.c_resolution == NULL) 837 return -EINVAL; 838 839 mutex_lock(®ister_mutex); 840 list_for_each(p, &snd_timer_list) { 841 timer1 = list_entry(p, struct snd_timer, device_list); 842 if (timer1->tmr_class > timer->tmr_class) 843 break; 844 if (timer1->tmr_class < timer->tmr_class) 845 continue; 846 if (timer1->card && timer->card) { 847 if (timer1->card->number > timer->card->number) 848 break; 849 if (timer1->card->number < timer->card->number) 850 continue; 851 } 852 if (timer1->tmr_device > timer->tmr_device) 853 break; 854 if (timer1->tmr_device < timer->tmr_device) 855 continue; 856 if (timer1->tmr_subdevice > timer->tmr_subdevice) 857 break; 858 if (timer1->tmr_subdevice < timer->tmr_subdevice) 859 continue; 860 /* conflicts.. */ 861 mutex_unlock(®ister_mutex); 862 return -EBUSY; 863 } 864 list_add_tail(&timer->device_list, p); 865 mutex_unlock(®ister_mutex); 866 return 0; 867 } 868 869 static int snd_timer_unregister(struct snd_timer *timer) 870 { 871 struct list_head *p, *n; 872 struct snd_timer_instance *ti; 873 874 snd_assert(timer != NULL, return -ENXIO); 875 mutex_lock(®ister_mutex); 876 if (! list_empty(&timer->open_list_head)) { 877 snd_printk(KERN_WARNING "timer 0x%lx is busy?\n", (long)timer); 878 list_for_each_safe(p, n, &timer->open_list_head) { 879 list_del_init(p); 880 ti = list_entry(p, struct snd_timer_instance, open_list); 881 ti->timer = NULL; 882 } 883 } 884 list_del(&timer->device_list); 885 mutex_unlock(®ister_mutex); 886 return snd_timer_free(timer); 887 } 888 889 static int snd_timer_dev_unregister(struct snd_device *device) 890 { 891 struct snd_timer *timer = device->device_data; 892 return snd_timer_unregister(timer); 893 } 894 895 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 896 { 897 unsigned long flags; 898 unsigned long resolution = 0; 899 struct snd_timer_instance *ti, *ts; 900 struct list_head *p, *n; 901 902 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 903 return; 904 snd_assert(event >= SNDRV_TIMER_EVENT_MSTART && 905 event <= SNDRV_TIMER_EVENT_MRESUME, return); 906 spin_lock_irqsave(&timer->lock, flags); 907 if (event == SNDRV_TIMER_EVENT_MSTART || 908 event == SNDRV_TIMER_EVENT_MCONTINUE || 909 event == SNDRV_TIMER_EVENT_MRESUME) { 910 if (timer->hw.c_resolution) 911 resolution = timer->hw.c_resolution(timer); 912 else 913 resolution = timer->hw.resolution; 914 } 915 list_for_each(p, &timer->active_list_head) { 916 ti = list_entry(p, struct snd_timer_instance, active_list); 917 if (ti->ccallback) 918 ti->ccallback(ti, event, tstamp, resolution); 919 list_for_each(n, &ti->slave_active_head) { 920 ts = list_entry(n, struct snd_timer_instance, active_list); 921 if (ts->ccallback) 922 ts->ccallback(ts, event, tstamp, resolution); 923 } 924 } 925 spin_unlock_irqrestore(&timer->lock, flags); 926 } 927 928 /* 929 * exported functions for global timers 930 */ 931 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 932 { 933 struct snd_timer_id tid; 934 935 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 936 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 937 tid.card = -1; 938 tid.device = device; 939 tid.subdevice = 0; 940 return snd_timer_new(NULL, id, &tid, rtimer); 941 } 942 943 int snd_timer_global_free(struct snd_timer *timer) 944 { 945 return snd_timer_free(timer); 946 } 947 948 int snd_timer_global_register(struct snd_timer *timer) 949 { 950 struct snd_device dev; 951 952 memset(&dev, 0, sizeof(dev)); 953 dev.device_data = timer; 954 return snd_timer_dev_register(&dev); 955 } 956 957 int snd_timer_global_unregister(struct snd_timer *timer) 958 { 959 return snd_timer_unregister(timer); 960 } 961 962 /* 963 * System timer 964 */ 965 966 struct snd_timer_system_private { 967 struct timer_list tlist; 968 struct timer * timer; 969 unsigned long last_expires; 970 unsigned long last_jiffies; 971 unsigned long correction; 972 }; 973 974 static void snd_timer_s_function(unsigned long data) 975 { 976 struct snd_timer *timer = (struct snd_timer *)data; 977 struct snd_timer_system_private *priv = timer->private_data; 978 unsigned long jiff = jiffies; 979 if (time_after(jiff, priv->last_expires)) 980 priv->correction = (long)jiff - (long)priv->last_expires; 981 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 982 } 983 984 static int snd_timer_s_start(struct snd_timer * timer) 985 { 986 struct snd_timer_system_private *priv; 987 unsigned long njiff; 988 989 priv = (struct snd_timer_system_private *) timer->private_data; 990 njiff = (priv->last_jiffies = jiffies); 991 if (priv->correction > timer->sticks - 1) { 992 priv->correction -= timer->sticks - 1; 993 njiff++; 994 } else { 995 njiff += timer->sticks - priv->correction; 996 priv->correction -= timer->sticks; 997 } 998 priv->last_expires = priv->tlist.expires = njiff; 999 add_timer(&priv->tlist); 1000 return 0; 1001 } 1002 1003 static int snd_timer_s_stop(struct snd_timer * timer) 1004 { 1005 struct snd_timer_system_private *priv; 1006 unsigned long jiff; 1007 1008 priv = (struct snd_timer_system_private *) timer->private_data; 1009 del_timer(&priv->tlist); 1010 jiff = jiffies; 1011 if (time_before(jiff, priv->last_expires)) 1012 timer->sticks = priv->last_expires - jiff; 1013 else 1014 timer->sticks = 1; 1015 return 0; 1016 } 1017 1018 static struct snd_timer_hardware snd_timer_system = 1019 { 1020 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1021 .resolution = 1000000000L / HZ, 1022 .ticks = 10000000L, 1023 .start = snd_timer_s_start, 1024 .stop = snd_timer_s_stop 1025 }; 1026 1027 static void snd_timer_free_system(struct snd_timer *timer) 1028 { 1029 kfree(timer->private_data); 1030 } 1031 1032 static int snd_timer_register_system(void) 1033 { 1034 struct snd_timer *timer; 1035 struct snd_timer_system_private *priv; 1036 int err; 1037 1038 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1039 if (err < 0) 1040 return err; 1041 strcpy(timer->name, "system timer"); 1042 timer->hw = snd_timer_system; 1043 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1044 if (priv == NULL) { 1045 snd_timer_free(timer); 1046 return -ENOMEM; 1047 } 1048 init_timer(&priv->tlist); 1049 priv->tlist.function = snd_timer_s_function; 1050 priv->tlist.data = (unsigned long) timer; 1051 timer->private_data = priv; 1052 timer->private_free = snd_timer_free_system; 1053 return snd_timer_global_register(timer); 1054 } 1055 1056 #ifdef CONFIG_PROC_FS 1057 /* 1058 * Info interface 1059 */ 1060 1061 static void snd_timer_proc_read(struct snd_info_entry *entry, 1062 struct snd_info_buffer *buffer) 1063 { 1064 unsigned long flags; 1065 struct snd_timer *timer; 1066 struct snd_timer_instance *ti; 1067 struct list_head *p, *q; 1068 1069 mutex_lock(®ister_mutex); 1070 list_for_each(p, &snd_timer_list) { 1071 timer = list_entry(p, struct snd_timer, device_list); 1072 switch (timer->tmr_class) { 1073 case SNDRV_TIMER_CLASS_GLOBAL: 1074 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1075 break; 1076 case SNDRV_TIMER_CLASS_CARD: 1077 snd_iprintf(buffer, "C%i-%i: ", 1078 timer->card->number, timer->tmr_device); 1079 break; 1080 case SNDRV_TIMER_CLASS_PCM: 1081 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1082 timer->tmr_device, timer->tmr_subdevice); 1083 break; 1084 default: 1085 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1086 timer->card ? timer->card->number : -1, 1087 timer->tmr_device, timer->tmr_subdevice); 1088 } 1089 snd_iprintf(buffer, "%s :", timer->name); 1090 if (timer->hw.resolution) 1091 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1092 timer->hw.resolution / 1000, 1093 timer->hw.resolution % 1000, 1094 timer->hw.ticks); 1095 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1096 snd_iprintf(buffer, " SLAVE"); 1097 snd_iprintf(buffer, "\n"); 1098 spin_lock_irqsave(&timer->lock, flags); 1099 list_for_each(q, &timer->open_list_head) { 1100 ti = list_entry(q, struct snd_timer_instance, open_list); 1101 snd_iprintf(buffer, " Client %s : %s\n", 1102 ti->owner ? ti->owner : "unknown", 1103 ti->flags & (SNDRV_TIMER_IFLG_START | 1104 SNDRV_TIMER_IFLG_RUNNING) 1105 ? "running" : "stopped"); 1106 } 1107 spin_unlock_irqrestore(&timer->lock, flags); 1108 } 1109 mutex_unlock(®ister_mutex); 1110 } 1111 1112 static struct snd_info_entry *snd_timer_proc_entry = NULL; 1113 1114 static void __init snd_timer_proc_init(void) 1115 { 1116 struct snd_info_entry *entry; 1117 1118 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1119 if (entry != NULL) { 1120 entry->c.text.read_size = SNDRV_TIMER_DEVICES * 128; 1121 entry->c.text.read = snd_timer_proc_read; 1122 if (snd_info_register(entry) < 0) { 1123 snd_info_free_entry(entry); 1124 entry = NULL; 1125 } 1126 } 1127 snd_timer_proc_entry = entry; 1128 } 1129 1130 static void __exit snd_timer_proc_done(void) 1131 { 1132 snd_info_unregister(snd_timer_proc_entry); 1133 } 1134 #else /* !CONFIG_PROC_FS */ 1135 #define snd_timer_proc_init() 1136 #define snd_timer_proc_done() 1137 #endif 1138 1139 /* 1140 * USER SPACE interface 1141 */ 1142 1143 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1144 unsigned long resolution, 1145 unsigned long ticks) 1146 { 1147 struct snd_timer_user *tu = timeri->callback_data; 1148 struct snd_timer_read *r; 1149 int prev; 1150 1151 spin_lock(&tu->qlock); 1152 if (tu->qused > 0) { 1153 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1154 r = &tu->queue[prev]; 1155 if (r->resolution == resolution) { 1156 r->ticks += ticks; 1157 goto __wake; 1158 } 1159 } 1160 if (tu->qused >= tu->queue_size) { 1161 tu->overrun++; 1162 } else { 1163 r = &tu->queue[tu->qtail++]; 1164 tu->qtail %= tu->queue_size; 1165 r->resolution = resolution; 1166 r->ticks = ticks; 1167 tu->qused++; 1168 } 1169 __wake: 1170 spin_unlock(&tu->qlock); 1171 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1172 wake_up(&tu->qchange_sleep); 1173 } 1174 1175 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1176 struct snd_timer_tread *tread) 1177 { 1178 if (tu->qused >= tu->queue_size) { 1179 tu->overrun++; 1180 } else { 1181 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1182 tu->qtail %= tu->queue_size; 1183 tu->qused++; 1184 } 1185 } 1186 1187 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1188 int event, 1189 struct timespec *tstamp, 1190 unsigned long resolution) 1191 { 1192 struct snd_timer_user *tu = timeri->callback_data; 1193 struct snd_timer_tread r1; 1194 1195 if (event >= SNDRV_TIMER_EVENT_START && 1196 event <= SNDRV_TIMER_EVENT_PAUSE) 1197 tu->tstamp = *tstamp; 1198 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1199 return; 1200 r1.event = event; 1201 r1.tstamp = *tstamp; 1202 r1.val = resolution; 1203 spin_lock(&tu->qlock); 1204 snd_timer_user_append_to_tqueue(tu, &r1); 1205 spin_unlock(&tu->qlock); 1206 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1207 wake_up(&tu->qchange_sleep); 1208 } 1209 1210 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1211 unsigned long resolution, 1212 unsigned long ticks) 1213 { 1214 struct snd_timer_user *tu = timeri->callback_data; 1215 struct snd_timer_tread *r, r1; 1216 struct timespec tstamp; 1217 int prev, append = 0; 1218 1219 memset(&tstamp, 0, sizeof(tstamp)); 1220 spin_lock(&tu->qlock); 1221 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1222 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1223 spin_unlock(&tu->qlock); 1224 return; 1225 } 1226 if (tu->last_resolution != resolution || ticks > 0) 1227 getnstimeofday(&tstamp); 1228 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1229 tu->last_resolution != resolution) { 1230 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1231 r1.tstamp = tstamp; 1232 r1.val = resolution; 1233 snd_timer_user_append_to_tqueue(tu, &r1); 1234 tu->last_resolution = resolution; 1235 append++; 1236 } 1237 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1238 goto __wake; 1239 if (ticks == 0) 1240 goto __wake; 1241 if (tu->qused > 0) { 1242 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1243 r = &tu->tqueue[prev]; 1244 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1245 r->tstamp = tstamp; 1246 r->val += ticks; 1247 append++; 1248 goto __wake; 1249 } 1250 } 1251 r1.event = SNDRV_TIMER_EVENT_TICK; 1252 r1.tstamp = tstamp; 1253 r1.val = ticks; 1254 snd_timer_user_append_to_tqueue(tu, &r1); 1255 append++; 1256 __wake: 1257 spin_unlock(&tu->qlock); 1258 if (append == 0) 1259 return; 1260 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1261 wake_up(&tu->qchange_sleep); 1262 } 1263 1264 static int snd_timer_user_open(struct inode *inode, struct file *file) 1265 { 1266 struct snd_timer_user *tu; 1267 1268 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1269 if (tu == NULL) 1270 return -ENOMEM; 1271 spin_lock_init(&tu->qlock); 1272 init_waitqueue_head(&tu->qchange_sleep); 1273 mutex_init(&tu->tread_sem); 1274 tu->ticks = 1; 1275 tu->queue_size = 128; 1276 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1277 GFP_KERNEL); 1278 if (tu->queue == NULL) { 1279 kfree(tu); 1280 return -ENOMEM; 1281 } 1282 file->private_data = tu; 1283 return 0; 1284 } 1285 1286 static int snd_timer_user_release(struct inode *inode, struct file *file) 1287 { 1288 struct snd_timer_user *tu; 1289 1290 if (file->private_data) { 1291 tu = file->private_data; 1292 file->private_data = NULL; 1293 fasync_helper(-1, file, 0, &tu->fasync); 1294 if (tu->timeri) 1295 snd_timer_close(tu->timeri); 1296 kfree(tu->queue); 1297 kfree(tu->tqueue); 1298 kfree(tu); 1299 } 1300 return 0; 1301 } 1302 1303 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1304 { 1305 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1306 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1307 id->card = -1; 1308 id->device = -1; 1309 id->subdevice = -1; 1310 } 1311 1312 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1313 { 1314 id->dev_class = timer->tmr_class; 1315 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1316 id->card = timer->card ? timer->card->number : -1; 1317 id->device = timer->tmr_device; 1318 id->subdevice = timer->tmr_subdevice; 1319 } 1320 1321 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1322 { 1323 struct snd_timer_id id; 1324 struct snd_timer *timer; 1325 struct list_head *p; 1326 1327 if (copy_from_user(&id, _tid, sizeof(id))) 1328 return -EFAULT; 1329 mutex_lock(®ister_mutex); 1330 if (id.dev_class < 0) { /* first item */ 1331 if (list_empty(&snd_timer_list)) 1332 snd_timer_user_zero_id(&id); 1333 else { 1334 timer = list_entry(snd_timer_list.next, 1335 struct snd_timer, device_list); 1336 snd_timer_user_copy_id(&id, timer); 1337 } 1338 } else { 1339 switch (id.dev_class) { 1340 case SNDRV_TIMER_CLASS_GLOBAL: 1341 id.device = id.device < 0 ? 0 : id.device + 1; 1342 list_for_each(p, &snd_timer_list) { 1343 timer = list_entry(p, struct snd_timer, device_list); 1344 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1345 snd_timer_user_copy_id(&id, timer); 1346 break; 1347 } 1348 if (timer->tmr_device >= id.device) { 1349 snd_timer_user_copy_id(&id, timer); 1350 break; 1351 } 1352 } 1353 if (p == &snd_timer_list) 1354 snd_timer_user_zero_id(&id); 1355 break; 1356 case SNDRV_TIMER_CLASS_CARD: 1357 case SNDRV_TIMER_CLASS_PCM: 1358 if (id.card < 0) { 1359 id.card = 0; 1360 } else { 1361 if (id.card < 0) { 1362 id.card = 0; 1363 } else { 1364 if (id.device < 0) { 1365 id.device = 0; 1366 } else { 1367 if (id.subdevice < 0) { 1368 id.subdevice = 0; 1369 } else { 1370 id.subdevice++; 1371 } 1372 } 1373 } 1374 } 1375 list_for_each(p, &snd_timer_list) { 1376 timer = list_entry(p, struct snd_timer, device_list); 1377 if (timer->tmr_class > id.dev_class) { 1378 snd_timer_user_copy_id(&id, timer); 1379 break; 1380 } 1381 if (timer->tmr_class < id.dev_class) 1382 continue; 1383 if (timer->card->number > id.card) { 1384 snd_timer_user_copy_id(&id, timer); 1385 break; 1386 } 1387 if (timer->card->number < id.card) 1388 continue; 1389 if (timer->tmr_device > id.device) { 1390 snd_timer_user_copy_id(&id, timer); 1391 break; 1392 } 1393 if (timer->tmr_device < id.device) 1394 continue; 1395 if (timer->tmr_subdevice > id.subdevice) { 1396 snd_timer_user_copy_id(&id, timer); 1397 break; 1398 } 1399 if (timer->tmr_subdevice < id.subdevice) 1400 continue; 1401 snd_timer_user_copy_id(&id, timer); 1402 break; 1403 } 1404 if (p == &snd_timer_list) 1405 snd_timer_user_zero_id(&id); 1406 break; 1407 default: 1408 snd_timer_user_zero_id(&id); 1409 } 1410 } 1411 mutex_unlock(®ister_mutex); 1412 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1413 return -EFAULT; 1414 return 0; 1415 } 1416 1417 static int snd_timer_user_ginfo(struct file *file, 1418 struct snd_timer_ginfo __user *_ginfo) 1419 { 1420 struct snd_timer_ginfo *ginfo; 1421 struct snd_timer_id tid; 1422 struct snd_timer *t; 1423 struct list_head *p; 1424 int err = 0; 1425 1426 ginfo = kmalloc(sizeof(*ginfo), GFP_KERNEL); 1427 if (! ginfo) 1428 return -ENOMEM; 1429 if (copy_from_user(ginfo, _ginfo, sizeof(*ginfo))) { 1430 kfree(ginfo); 1431 return -EFAULT; 1432 } 1433 tid = ginfo->tid; 1434 memset(ginfo, 0, sizeof(*ginfo)); 1435 ginfo->tid = tid; 1436 mutex_lock(®ister_mutex); 1437 t = snd_timer_find(&tid); 1438 if (t != NULL) { 1439 ginfo->card = t->card ? t->card->number : -1; 1440 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1441 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1442 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1443 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1444 ginfo->resolution = t->hw.resolution; 1445 if (t->hw.resolution_min > 0) { 1446 ginfo->resolution_min = t->hw.resolution_min; 1447 ginfo->resolution_max = t->hw.resolution_max; 1448 } 1449 list_for_each(p, &t->open_list_head) { 1450 ginfo->clients++; 1451 } 1452 } else { 1453 err = -ENODEV; 1454 } 1455 mutex_unlock(®ister_mutex); 1456 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1457 err = -EFAULT; 1458 kfree(ginfo); 1459 return err; 1460 } 1461 1462 static int snd_timer_user_gparams(struct file *file, 1463 struct snd_timer_gparams __user *_gparams) 1464 { 1465 struct snd_timer_gparams gparams; 1466 struct snd_timer *t; 1467 int err; 1468 1469 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1470 return -EFAULT; 1471 mutex_lock(®ister_mutex); 1472 t = snd_timer_find(&gparams.tid); 1473 if (!t) { 1474 err = -ENODEV; 1475 goto _error; 1476 } 1477 if (!list_empty(&t->open_list_head)) { 1478 err = -EBUSY; 1479 goto _error; 1480 } 1481 if (!t->hw.set_period) { 1482 err = -ENOSYS; 1483 goto _error; 1484 } 1485 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1486 _error: 1487 mutex_unlock(®ister_mutex); 1488 return err; 1489 } 1490 1491 static int snd_timer_user_gstatus(struct file *file, 1492 struct snd_timer_gstatus __user *_gstatus) 1493 { 1494 struct snd_timer_gstatus gstatus; 1495 struct snd_timer_id tid; 1496 struct snd_timer *t; 1497 int err = 0; 1498 1499 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1500 return -EFAULT; 1501 tid = gstatus.tid; 1502 memset(&gstatus, 0, sizeof(gstatus)); 1503 gstatus.tid = tid; 1504 mutex_lock(®ister_mutex); 1505 t = snd_timer_find(&tid); 1506 if (t != NULL) { 1507 if (t->hw.c_resolution) 1508 gstatus.resolution = t->hw.c_resolution(t); 1509 else 1510 gstatus.resolution = t->hw.resolution; 1511 if (t->hw.precise_resolution) { 1512 t->hw.precise_resolution(t, &gstatus.resolution_num, 1513 &gstatus.resolution_den); 1514 } else { 1515 gstatus.resolution_num = gstatus.resolution; 1516 gstatus.resolution_den = 1000000000uL; 1517 } 1518 } else { 1519 err = -ENODEV; 1520 } 1521 mutex_unlock(®ister_mutex); 1522 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1523 err = -EFAULT; 1524 return err; 1525 } 1526 1527 static int snd_timer_user_tselect(struct file *file, 1528 struct snd_timer_select __user *_tselect) 1529 { 1530 struct snd_timer_user *tu; 1531 struct snd_timer_select tselect; 1532 char str[32]; 1533 int err = 0; 1534 1535 tu = file->private_data; 1536 mutex_lock(&tu->tread_sem); 1537 if (tu->timeri) { 1538 snd_timer_close(tu->timeri); 1539 tu->timeri = NULL; 1540 } 1541 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1542 err = -EFAULT; 1543 goto __err; 1544 } 1545 sprintf(str, "application %i", current->pid); 1546 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1547 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1548 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1549 if (err < 0) 1550 goto __err; 1551 1552 kfree(tu->queue); 1553 tu->queue = NULL; 1554 kfree(tu->tqueue); 1555 tu->tqueue = NULL; 1556 if (tu->tread) { 1557 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1558 GFP_KERNEL); 1559 if (tu->tqueue == NULL) 1560 err = -ENOMEM; 1561 } else { 1562 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1563 GFP_KERNEL); 1564 if (tu->queue == NULL) 1565 err = -ENOMEM; 1566 } 1567 1568 if (err < 0) { 1569 snd_timer_close(tu->timeri); 1570 tu->timeri = NULL; 1571 } else { 1572 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1573 tu->timeri->callback = tu->tread 1574 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1575 tu->timeri->ccallback = snd_timer_user_ccallback; 1576 tu->timeri->callback_data = (void *)tu; 1577 } 1578 1579 __err: 1580 mutex_unlock(&tu->tread_sem); 1581 return err; 1582 } 1583 1584 static int snd_timer_user_info(struct file *file, 1585 struct snd_timer_info __user *_info) 1586 { 1587 struct snd_timer_user *tu; 1588 struct snd_timer_info *info; 1589 struct snd_timer *t; 1590 int err = 0; 1591 1592 tu = file->private_data; 1593 snd_assert(tu->timeri != NULL, return -ENXIO); 1594 t = tu->timeri->timer; 1595 snd_assert(t != NULL, return -ENXIO); 1596 1597 info = kzalloc(sizeof(*info), GFP_KERNEL); 1598 if (! info) 1599 return -ENOMEM; 1600 info->card = t->card ? t->card->number : -1; 1601 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1602 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1603 strlcpy(info->id, t->id, sizeof(info->id)); 1604 strlcpy(info->name, t->name, sizeof(info->name)); 1605 info->resolution = t->hw.resolution; 1606 if (copy_to_user(_info, info, sizeof(*_info))) 1607 err = -EFAULT; 1608 kfree(info); 1609 return err; 1610 } 1611 1612 static int snd_timer_user_params(struct file *file, 1613 struct snd_timer_params __user *_params) 1614 { 1615 struct snd_timer_user *tu; 1616 struct snd_timer_params params; 1617 struct snd_timer *t; 1618 struct snd_timer_read *tr; 1619 struct snd_timer_tread *ttr; 1620 int err; 1621 1622 tu = file->private_data; 1623 snd_assert(tu->timeri != NULL, return -ENXIO); 1624 t = tu->timeri->timer; 1625 snd_assert(t != NULL, return -ENXIO); 1626 if (copy_from_user(¶ms, _params, sizeof(params))) 1627 return -EFAULT; 1628 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1629 err = -EINVAL; 1630 goto _end; 1631 } 1632 if (params.queue_size > 0 && 1633 (params.queue_size < 32 || params.queue_size > 1024)) { 1634 err = -EINVAL; 1635 goto _end; 1636 } 1637 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1638 (1<<SNDRV_TIMER_EVENT_TICK)| 1639 (1<<SNDRV_TIMER_EVENT_START)| 1640 (1<<SNDRV_TIMER_EVENT_STOP)| 1641 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1642 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1643 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1644 (1<<SNDRV_TIMER_EVENT_RESUME)| 1645 (1<<SNDRV_TIMER_EVENT_MSTART)| 1646 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1647 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1648 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1649 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1650 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1651 err = -EINVAL; 1652 goto _end; 1653 } 1654 snd_timer_stop(tu->timeri); 1655 spin_lock_irq(&t->lock); 1656 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1657 SNDRV_TIMER_IFLG_EXCLUSIVE| 1658 SNDRV_TIMER_IFLG_EARLY_EVENT); 1659 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1660 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1661 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1662 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1663 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1664 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1665 spin_unlock_irq(&t->lock); 1666 if (params.queue_size > 0 && 1667 (unsigned int)tu->queue_size != params.queue_size) { 1668 if (tu->tread) { 1669 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1670 GFP_KERNEL); 1671 if (ttr) { 1672 kfree(tu->tqueue); 1673 tu->queue_size = params.queue_size; 1674 tu->tqueue = ttr; 1675 } 1676 } else { 1677 tr = kmalloc(params.queue_size * sizeof(*tr), 1678 GFP_KERNEL); 1679 if (tr) { 1680 kfree(tu->queue); 1681 tu->queue_size = params.queue_size; 1682 tu->queue = tr; 1683 } 1684 } 1685 } 1686 tu->qhead = tu->qtail = tu->qused = 0; 1687 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1688 if (tu->tread) { 1689 struct snd_timer_tread tread; 1690 tread.event = SNDRV_TIMER_EVENT_EARLY; 1691 tread.tstamp.tv_sec = 0; 1692 tread.tstamp.tv_nsec = 0; 1693 tread.val = 0; 1694 snd_timer_user_append_to_tqueue(tu, &tread); 1695 } else { 1696 struct snd_timer_read *r = &tu->queue[0]; 1697 r->resolution = 0; 1698 r->ticks = 0; 1699 tu->qused++; 1700 tu->qtail++; 1701 } 1702 } 1703 tu->filter = params.filter; 1704 tu->ticks = params.ticks; 1705 err = 0; 1706 _end: 1707 if (copy_to_user(_params, ¶ms, sizeof(params))) 1708 return -EFAULT; 1709 return err; 1710 } 1711 1712 static int snd_timer_user_status(struct file *file, 1713 struct snd_timer_status __user *_status) 1714 { 1715 struct snd_timer_user *tu; 1716 struct snd_timer_status status; 1717 1718 tu = file->private_data; 1719 snd_assert(tu->timeri != NULL, return -ENXIO); 1720 memset(&status, 0, sizeof(status)); 1721 status.tstamp = tu->tstamp; 1722 status.resolution = snd_timer_resolution(tu->timeri); 1723 status.lost = tu->timeri->lost; 1724 status.overrun = tu->overrun; 1725 spin_lock_irq(&tu->qlock); 1726 status.queue = tu->qused; 1727 spin_unlock_irq(&tu->qlock); 1728 if (copy_to_user(_status, &status, sizeof(status))) 1729 return -EFAULT; 1730 return 0; 1731 } 1732 1733 static int snd_timer_user_start(struct file *file) 1734 { 1735 int err; 1736 struct snd_timer_user *tu; 1737 1738 tu = file->private_data; 1739 snd_assert(tu->timeri != NULL, return -ENXIO); 1740 snd_timer_stop(tu->timeri); 1741 tu->timeri->lost = 0; 1742 tu->last_resolution = 0; 1743 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1744 } 1745 1746 static int snd_timer_user_stop(struct file *file) 1747 { 1748 int err; 1749 struct snd_timer_user *tu; 1750 1751 tu = file->private_data; 1752 snd_assert(tu->timeri != NULL, return -ENXIO); 1753 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1754 } 1755 1756 static int snd_timer_user_continue(struct file *file) 1757 { 1758 int err; 1759 struct snd_timer_user *tu; 1760 1761 tu = file->private_data; 1762 snd_assert(tu->timeri != NULL, return -ENXIO); 1763 tu->timeri->lost = 0; 1764 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1765 } 1766 1767 static int snd_timer_user_pause(struct file *file) 1768 { 1769 int err; 1770 struct snd_timer_user *tu; 1771 1772 tu = file->private_data; 1773 snd_assert(tu->timeri != NULL, return -ENXIO); 1774 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1775 } 1776 1777 enum { 1778 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1779 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1780 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1781 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1782 }; 1783 1784 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1785 unsigned long arg) 1786 { 1787 struct snd_timer_user *tu; 1788 void __user *argp = (void __user *)arg; 1789 int __user *p = argp; 1790 1791 tu = file->private_data; 1792 switch (cmd) { 1793 case SNDRV_TIMER_IOCTL_PVERSION: 1794 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1795 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1796 return snd_timer_user_next_device(argp); 1797 case SNDRV_TIMER_IOCTL_TREAD: 1798 { 1799 int xarg; 1800 1801 mutex_lock(&tu->tread_sem); 1802 if (tu->timeri) { /* too late */ 1803 mutex_unlock(&tu->tread_sem); 1804 return -EBUSY; 1805 } 1806 if (get_user(xarg, p)) { 1807 mutex_unlock(&tu->tread_sem); 1808 return -EFAULT; 1809 } 1810 tu->tread = xarg ? 1 : 0; 1811 mutex_unlock(&tu->tread_sem); 1812 return 0; 1813 } 1814 case SNDRV_TIMER_IOCTL_GINFO: 1815 return snd_timer_user_ginfo(file, argp); 1816 case SNDRV_TIMER_IOCTL_GPARAMS: 1817 return snd_timer_user_gparams(file, argp); 1818 case SNDRV_TIMER_IOCTL_GSTATUS: 1819 return snd_timer_user_gstatus(file, argp); 1820 case SNDRV_TIMER_IOCTL_SELECT: 1821 return snd_timer_user_tselect(file, argp); 1822 case SNDRV_TIMER_IOCTL_INFO: 1823 return snd_timer_user_info(file, argp); 1824 case SNDRV_TIMER_IOCTL_PARAMS: 1825 return snd_timer_user_params(file, argp); 1826 case SNDRV_TIMER_IOCTL_STATUS: 1827 return snd_timer_user_status(file, argp); 1828 case SNDRV_TIMER_IOCTL_START: 1829 case SNDRV_TIMER_IOCTL_START_OLD: 1830 return snd_timer_user_start(file); 1831 case SNDRV_TIMER_IOCTL_STOP: 1832 case SNDRV_TIMER_IOCTL_STOP_OLD: 1833 return snd_timer_user_stop(file); 1834 case SNDRV_TIMER_IOCTL_CONTINUE: 1835 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1836 return snd_timer_user_continue(file); 1837 case SNDRV_TIMER_IOCTL_PAUSE: 1838 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1839 return snd_timer_user_pause(file); 1840 } 1841 return -ENOTTY; 1842 } 1843 1844 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1845 { 1846 struct snd_timer_user *tu; 1847 int err; 1848 1849 tu = file->private_data; 1850 err = fasync_helper(fd, file, on, &tu->fasync); 1851 if (err < 0) 1852 return err; 1853 return 0; 1854 } 1855 1856 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1857 size_t count, loff_t *offset) 1858 { 1859 struct snd_timer_user *tu; 1860 long result = 0, unit; 1861 int err = 0; 1862 1863 tu = file->private_data; 1864 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1865 spin_lock_irq(&tu->qlock); 1866 while ((long)count - result >= unit) { 1867 while (!tu->qused) { 1868 wait_queue_t wait; 1869 1870 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1871 err = -EAGAIN; 1872 break; 1873 } 1874 1875 set_current_state(TASK_INTERRUPTIBLE); 1876 init_waitqueue_entry(&wait, current); 1877 add_wait_queue(&tu->qchange_sleep, &wait); 1878 1879 spin_unlock_irq(&tu->qlock); 1880 schedule(); 1881 spin_lock_irq(&tu->qlock); 1882 1883 remove_wait_queue(&tu->qchange_sleep, &wait); 1884 1885 if (signal_pending(current)) { 1886 err = -ERESTARTSYS; 1887 break; 1888 } 1889 } 1890 1891 spin_unlock_irq(&tu->qlock); 1892 if (err < 0) 1893 goto _error; 1894 1895 if (tu->tread) { 1896 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1897 sizeof(struct snd_timer_tread))) { 1898 err = -EFAULT; 1899 goto _error; 1900 } 1901 } else { 1902 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1903 sizeof(struct snd_timer_read))) { 1904 err = -EFAULT; 1905 goto _error; 1906 } 1907 } 1908 1909 tu->qhead %= tu->queue_size; 1910 1911 result += unit; 1912 buffer += unit; 1913 1914 spin_lock_irq(&tu->qlock); 1915 tu->qused--; 1916 } 1917 spin_unlock_irq(&tu->qlock); 1918 _error: 1919 return result > 0 ? result : err; 1920 } 1921 1922 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1923 { 1924 unsigned int mask; 1925 struct snd_timer_user *tu; 1926 1927 tu = file->private_data; 1928 1929 poll_wait(file, &tu->qchange_sleep, wait); 1930 1931 mask = 0; 1932 if (tu->qused) 1933 mask |= POLLIN | POLLRDNORM; 1934 1935 return mask; 1936 } 1937 1938 #ifdef CONFIG_COMPAT 1939 #include "timer_compat.c" 1940 #else 1941 #define snd_timer_user_ioctl_compat NULL 1942 #endif 1943 1944 static struct file_operations snd_timer_f_ops = 1945 { 1946 .owner = THIS_MODULE, 1947 .read = snd_timer_user_read, 1948 .open = snd_timer_user_open, 1949 .release = snd_timer_user_release, 1950 .poll = snd_timer_user_poll, 1951 .unlocked_ioctl = snd_timer_user_ioctl, 1952 .compat_ioctl = snd_timer_user_ioctl_compat, 1953 .fasync = snd_timer_user_fasync, 1954 }; 1955 1956 /* 1957 * ENTRY functions 1958 */ 1959 1960 static int __init alsa_timer_init(void) 1961 { 1962 int err; 1963 1964 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1965 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1966 "system timer"); 1967 #endif 1968 1969 if ((err = snd_timer_register_system()) < 0) 1970 snd_printk(KERN_ERR "unable to register system timer (%i)\n", 1971 err); 1972 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1973 &snd_timer_f_ops, NULL, "timer")) < 0) 1974 snd_printk(KERN_ERR "unable to register timer device (%i)\n", 1975 err); 1976 snd_timer_proc_init(); 1977 return 0; 1978 } 1979 1980 static void __exit alsa_timer_exit(void) 1981 { 1982 struct list_head *p, *n; 1983 1984 snd_unregister_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0); 1985 /* unregister the system timer */ 1986 list_for_each_safe(p, n, &snd_timer_list) { 1987 struct snd_timer *timer = list_entry(p, struct snd_timer, device_list); 1988 snd_timer_unregister(timer); 1989 } 1990 snd_timer_proc_done(); 1991 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1992 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 1993 #endif 1994 } 1995 1996 module_init(alsa_timer_init) 1997 module_exit(alsa_timer_exit) 1998 1999 EXPORT_SYMBOL(snd_timer_open); 2000 EXPORT_SYMBOL(snd_timer_close); 2001 EXPORT_SYMBOL(snd_timer_resolution); 2002 EXPORT_SYMBOL(snd_timer_start); 2003 EXPORT_SYMBOL(snd_timer_stop); 2004 EXPORT_SYMBOL(snd_timer_continue); 2005 EXPORT_SYMBOL(snd_timer_pause); 2006 EXPORT_SYMBOL(snd_timer_new); 2007 EXPORT_SYMBOL(snd_timer_notify); 2008 EXPORT_SYMBOL(snd_timer_global_new); 2009 EXPORT_SYMBOL(snd_timer_global_free); 2010 EXPORT_SYMBOL(snd_timer_global_register); 2011 EXPORT_SYMBOL(snd_timer_global_unregister); 2012 EXPORT_SYMBOL(snd_timer_interrupt); 2013