1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <[email protected]> 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 <[email protected]>, Takashi Iwai <[email protected]>"); 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 ioctl_lock; 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 spin_lock(&master->timer->lock); 219 slave->master = master; 220 slave->timer = master->timer; 221 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 222 list_add_tail(&slave->active_list, 223 &master->slave_active_head); 224 spin_unlock(&master->timer->lock); 225 spin_unlock_irq(&slave_active_lock); 226 } 227 } 228 } 229 230 /* 231 * open a timer instance 232 * when opening a master, the slave id must be here given. 233 */ 234 int snd_timer_open(struct snd_timer_instance **ti, 235 char *owner, struct snd_timer_id *tid, 236 unsigned int slave_id) 237 { 238 struct snd_timer *timer; 239 struct snd_timer_instance *timeri = NULL; 240 241 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 242 /* open a slave instance */ 243 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 244 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 245 pr_debug("ALSA: timer: invalid slave class %i\n", 246 tid->dev_sclass); 247 return -EINVAL; 248 } 249 mutex_lock(®ister_mutex); 250 timeri = snd_timer_instance_new(owner, NULL); 251 if (!timeri) { 252 mutex_unlock(®ister_mutex); 253 return -ENOMEM; 254 } 255 timeri->slave_class = tid->dev_sclass; 256 timeri->slave_id = tid->device; 257 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 258 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 259 snd_timer_check_slave(timeri); 260 mutex_unlock(®ister_mutex); 261 *ti = timeri; 262 return 0; 263 } 264 265 /* open a master instance */ 266 mutex_lock(®ister_mutex); 267 timer = snd_timer_find(tid); 268 #ifdef CONFIG_MODULES 269 if (!timer) { 270 mutex_unlock(®ister_mutex); 271 snd_timer_request(tid); 272 mutex_lock(®ister_mutex); 273 timer = snd_timer_find(tid); 274 } 275 #endif 276 if (!timer) { 277 mutex_unlock(®ister_mutex); 278 return -ENODEV; 279 } 280 if (!list_empty(&timer->open_list_head)) { 281 timeri = list_entry(timer->open_list_head.next, 282 struct snd_timer_instance, open_list); 283 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 284 mutex_unlock(®ister_mutex); 285 return -EBUSY; 286 } 287 } 288 timeri = snd_timer_instance_new(owner, timer); 289 if (!timeri) { 290 mutex_unlock(®ister_mutex); 291 return -ENOMEM; 292 } 293 timeri->slave_class = tid->dev_sclass; 294 timeri->slave_id = slave_id; 295 if (list_empty(&timer->open_list_head) && timer->hw.open) 296 timer->hw.open(timer); 297 list_add_tail(&timeri->open_list, &timer->open_list_head); 298 snd_timer_check_master(timeri); 299 mutex_unlock(®ister_mutex); 300 *ti = timeri; 301 return 0; 302 } 303 304 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event); 305 306 /* 307 * close a timer instance 308 */ 309 int snd_timer_close(struct snd_timer_instance *timeri) 310 { 311 struct snd_timer *timer = NULL; 312 struct snd_timer_instance *slave, *tmp; 313 314 if (snd_BUG_ON(!timeri)) 315 return -ENXIO; 316 317 /* force to stop the timer */ 318 snd_timer_stop(timeri); 319 320 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 321 /* wait, until the active callback is finished */ 322 spin_lock_irq(&slave_active_lock); 323 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 324 spin_unlock_irq(&slave_active_lock); 325 udelay(10); 326 spin_lock_irq(&slave_active_lock); 327 } 328 spin_unlock_irq(&slave_active_lock); 329 mutex_lock(®ister_mutex); 330 list_del(&timeri->open_list); 331 mutex_unlock(®ister_mutex); 332 } else { 333 timer = timeri->timer; 334 if (snd_BUG_ON(!timer)) 335 goto out; 336 /* wait, until the active callback is finished */ 337 spin_lock_irq(&timer->lock); 338 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 339 spin_unlock_irq(&timer->lock); 340 udelay(10); 341 spin_lock_irq(&timer->lock); 342 } 343 spin_unlock_irq(&timer->lock); 344 mutex_lock(®ister_mutex); 345 list_del(&timeri->open_list); 346 if (list_empty(&timer->open_list_head) && 347 timer->hw.close) 348 timer->hw.close(timer); 349 /* remove slave links */ 350 spin_lock_irq(&slave_active_lock); 351 spin_lock(&timer->lock); 352 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 353 open_list) { 354 list_move_tail(&slave->open_list, &snd_timer_slave_list); 355 slave->master = NULL; 356 slave->timer = NULL; 357 list_del_init(&slave->ack_list); 358 list_del_init(&slave->active_list); 359 } 360 spin_unlock(&timer->lock); 361 spin_unlock_irq(&slave_active_lock); 362 mutex_unlock(®ister_mutex); 363 } 364 out: 365 if (timeri->private_free) 366 timeri->private_free(timeri); 367 kfree(timeri->owner); 368 kfree(timeri); 369 if (timer) 370 module_put(timer->module); 371 return 0; 372 } 373 374 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 375 { 376 struct snd_timer * timer; 377 378 if (timeri == NULL) 379 return 0; 380 if ((timer = timeri->timer) != NULL) { 381 if (timer->hw.c_resolution) 382 return timer->hw.c_resolution(timer); 383 return timer->hw.resolution; 384 } 385 return 0; 386 } 387 388 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 389 { 390 struct snd_timer *timer; 391 unsigned long flags; 392 unsigned long resolution = 0; 393 struct snd_timer_instance *ts; 394 struct timespec tstamp; 395 396 if (timer_tstamp_monotonic) 397 ktime_get_ts(&tstamp); 398 else 399 getnstimeofday(&tstamp); 400 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 401 event > SNDRV_TIMER_EVENT_PAUSE)) 402 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, event, &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_entry(ts, &ti->slave_active_head, active_list) 417 if (ts->ccallback) 418 ts->ccallback(ti, event + 100, &tstamp, resolution); 419 spin_unlock_irqrestore(&timer->lock, flags); 420 } 421 422 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 423 unsigned long sticks) 424 { 425 list_move_tail(&timeri->active_list, &timer->active_list_head); 426 if (timer->running) { 427 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 428 goto __start_now; 429 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 430 timeri->flags |= SNDRV_TIMER_IFLG_START; 431 return 1; /* delayed start */ 432 } else { 433 timer->sticks = sticks; 434 timer->hw.start(timer); 435 __start_now: 436 timer->running++; 437 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 438 return 0; 439 } 440 } 441 442 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 443 { 444 unsigned long flags; 445 446 spin_lock_irqsave(&slave_active_lock, flags); 447 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 448 if (timeri->master && timeri->timer) { 449 spin_lock(&timeri->timer->lock); 450 list_add_tail(&timeri->active_list, 451 &timeri->master->slave_active_head); 452 spin_unlock(&timeri->timer->lock); 453 } 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, int event) 487 { 488 struct snd_timer *timer; 489 unsigned long flags; 490 491 if (snd_BUG_ON(!timeri)) 492 return -ENXIO; 493 494 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 495 spin_lock_irqsave(&slave_active_lock, flags); 496 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 497 list_del_init(&timeri->ack_list); 498 list_del_init(&timeri->active_list); 499 spin_unlock_irqrestore(&slave_active_lock, flags); 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 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 521 spin_unlock_irqrestore(&timer->lock, flags); 522 __end: 523 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 524 snd_timer_notify1(timeri, event); 525 return 0; 526 } 527 528 /* 529 * stop the timer instance. 530 * 531 * do not call this from the timer callback! 532 */ 533 int snd_timer_stop(struct snd_timer_instance *timeri) 534 { 535 struct snd_timer *timer; 536 unsigned long flags; 537 int err; 538 539 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP); 540 if (err < 0) 541 return err; 542 timer = timeri->timer; 543 if (!timer) 544 return -EINVAL; 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, 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; 596 597 list_for_each_entry(ti, &timer->active_list_head, active_list) { 598 if (ti->flags & SNDRV_TIMER_IFLG_START) { 599 ti->flags &= ~SNDRV_TIMER_IFLG_START; 600 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 601 timer->running++; 602 } 603 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 604 if (ticks > ti->cticks) 605 ticks = ti->cticks; 606 } 607 } 608 if (ticks == ~0UL) { 609 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 610 return; 611 } 612 if (ticks > timer->hw.ticks) 613 ticks = timer->hw.ticks; 614 if (ticks_left != ticks) 615 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 616 timer->sticks = ticks; 617 } 618 619 /* 620 * timer tasklet 621 * 622 */ 623 static void snd_timer_tasklet(unsigned long arg) 624 { 625 struct snd_timer *timer = (struct snd_timer *) arg; 626 struct snd_timer_instance *ti; 627 struct list_head *p; 628 unsigned long resolution, ticks; 629 unsigned long flags; 630 631 spin_lock_irqsave(&timer->lock, flags); 632 /* now process all callbacks */ 633 while (!list_empty(&timer->sack_list_head)) { 634 p = timer->sack_list_head.next; /* get first item */ 635 ti = list_entry(p, struct snd_timer_instance, ack_list); 636 637 /* remove from ack_list and make empty */ 638 list_del_init(p); 639 640 ticks = ti->pticks; 641 ti->pticks = 0; 642 resolution = ti->resolution; 643 644 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 645 spin_unlock(&timer->lock); 646 if (ti->callback) 647 ti->callback(ti, resolution, ticks); 648 spin_lock(&timer->lock); 649 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 650 } 651 spin_unlock_irqrestore(&timer->lock, flags); 652 } 653 654 /* 655 * timer interrupt 656 * 657 * ticks_left is usually equal to timer->sticks. 658 * 659 */ 660 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 661 { 662 struct snd_timer_instance *ti, *ts, *tmp; 663 unsigned long resolution, ticks; 664 struct list_head *p, *ack_list_head; 665 unsigned long flags; 666 int use_tasklet = 0; 667 668 if (timer == NULL) 669 return; 670 671 spin_lock_irqsave(&timer->lock, flags); 672 673 /* remember the current resolution */ 674 if (timer->hw.c_resolution) 675 resolution = timer->hw.c_resolution(timer); 676 else 677 resolution = timer->hw.resolution; 678 679 /* loop for all active instances 680 * Here we cannot use list_for_each_entry because the active_list of a 681 * processed instance is relinked to done_list_head before the callback 682 * is called. 683 */ 684 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 685 active_list) { 686 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 687 continue; 688 ti->pticks += ticks_left; 689 ti->resolution = resolution; 690 if (ti->cticks < ticks_left) 691 ti->cticks = 0; 692 else 693 ti->cticks -= ticks_left; 694 if (ti->cticks) /* not expired */ 695 continue; 696 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 697 ti->cticks = ti->ticks; 698 } else { 699 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 700 if (--timer->running) 701 list_del_init(&ti->active_list); 702 } 703 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 704 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 705 ack_list_head = &timer->ack_list_head; 706 else 707 ack_list_head = &timer->sack_list_head; 708 if (list_empty(&ti->ack_list)) 709 list_add_tail(&ti->ack_list, ack_list_head); 710 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 711 ts->pticks = ti->pticks; 712 ts->resolution = resolution; 713 if (list_empty(&ts->ack_list)) 714 list_add_tail(&ts->ack_list, ack_list_head); 715 } 716 } 717 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 718 snd_timer_reschedule(timer, timer->sticks); 719 if (timer->running) { 720 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 721 timer->hw.stop(timer); 722 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 723 } 724 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 725 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 726 /* restart timer */ 727 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 728 timer->hw.start(timer); 729 } 730 } else { 731 timer->hw.stop(timer); 732 } 733 734 /* now process all fast callbacks */ 735 while (!list_empty(&timer->ack_list_head)) { 736 p = timer->ack_list_head.next; /* get first item */ 737 ti = list_entry(p, struct snd_timer_instance, ack_list); 738 739 /* remove from ack_list and make empty */ 740 list_del_init(p); 741 742 ticks = ti->pticks; 743 ti->pticks = 0; 744 745 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 746 spin_unlock(&timer->lock); 747 if (ti->callback) 748 ti->callback(ti, resolution, ticks); 749 spin_lock(&timer->lock); 750 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 751 } 752 753 /* do we have any slow callbacks? */ 754 use_tasklet = !list_empty(&timer->sack_list_head); 755 spin_unlock_irqrestore(&timer->lock, flags); 756 757 if (use_tasklet) 758 tasklet_schedule(&timer->task_queue); 759 } 760 761 /* 762 763 */ 764 765 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 766 struct snd_timer **rtimer) 767 { 768 struct snd_timer *timer; 769 int err; 770 static struct snd_device_ops ops = { 771 .dev_free = snd_timer_dev_free, 772 .dev_register = snd_timer_dev_register, 773 .dev_disconnect = snd_timer_dev_disconnect, 774 }; 775 776 if (snd_BUG_ON(!tid)) 777 return -EINVAL; 778 if (rtimer) 779 *rtimer = NULL; 780 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 781 if (!timer) 782 return -ENOMEM; 783 timer->tmr_class = tid->dev_class; 784 timer->card = card; 785 timer->tmr_device = tid->device; 786 timer->tmr_subdevice = tid->subdevice; 787 if (id) 788 strlcpy(timer->id, id, sizeof(timer->id)); 789 INIT_LIST_HEAD(&timer->device_list); 790 INIT_LIST_HEAD(&timer->open_list_head); 791 INIT_LIST_HEAD(&timer->active_list_head); 792 INIT_LIST_HEAD(&timer->ack_list_head); 793 INIT_LIST_HEAD(&timer->sack_list_head); 794 spin_lock_init(&timer->lock); 795 tasklet_init(&timer->task_queue, snd_timer_tasklet, 796 (unsigned long)timer); 797 if (card != NULL) { 798 timer->module = card->module; 799 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 800 if (err < 0) { 801 snd_timer_free(timer); 802 return err; 803 } 804 } 805 if (rtimer) 806 *rtimer = timer; 807 return 0; 808 } 809 810 static int snd_timer_free(struct snd_timer *timer) 811 { 812 if (!timer) 813 return 0; 814 815 mutex_lock(®ister_mutex); 816 if (! list_empty(&timer->open_list_head)) { 817 struct list_head *p, *n; 818 struct snd_timer_instance *ti; 819 pr_warn("ALSA: timer %p is busy?\n", timer); 820 list_for_each_safe(p, n, &timer->open_list_head) { 821 list_del_init(p); 822 ti = list_entry(p, struct snd_timer_instance, open_list); 823 ti->timer = NULL; 824 } 825 } 826 list_del(&timer->device_list); 827 mutex_unlock(®ister_mutex); 828 829 if (timer->private_free) 830 timer->private_free(timer); 831 kfree(timer); 832 return 0; 833 } 834 835 static int snd_timer_dev_free(struct snd_device *device) 836 { 837 struct snd_timer *timer = device->device_data; 838 return snd_timer_free(timer); 839 } 840 841 static int snd_timer_dev_register(struct snd_device *dev) 842 { 843 struct snd_timer *timer = dev->device_data; 844 struct snd_timer *timer1; 845 846 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 847 return -ENXIO; 848 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 849 !timer->hw.resolution && timer->hw.c_resolution == NULL) 850 return -EINVAL; 851 852 mutex_lock(®ister_mutex); 853 list_for_each_entry(timer1, &snd_timer_list, device_list) { 854 if (timer1->tmr_class > timer->tmr_class) 855 break; 856 if (timer1->tmr_class < timer->tmr_class) 857 continue; 858 if (timer1->card && timer->card) { 859 if (timer1->card->number > timer->card->number) 860 break; 861 if (timer1->card->number < timer->card->number) 862 continue; 863 } 864 if (timer1->tmr_device > timer->tmr_device) 865 break; 866 if (timer1->tmr_device < timer->tmr_device) 867 continue; 868 if (timer1->tmr_subdevice > timer->tmr_subdevice) 869 break; 870 if (timer1->tmr_subdevice < timer->tmr_subdevice) 871 continue; 872 /* conflicts.. */ 873 mutex_unlock(®ister_mutex); 874 return -EBUSY; 875 } 876 list_add_tail(&timer->device_list, &timer1->device_list); 877 mutex_unlock(®ister_mutex); 878 return 0; 879 } 880 881 static int snd_timer_dev_disconnect(struct snd_device *device) 882 { 883 struct snd_timer *timer = device->device_data; 884 mutex_lock(®ister_mutex); 885 list_del_init(&timer->device_list); 886 mutex_unlock(®ister_mutex); 887 return 0; 888 } 889 890 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 891 { 892 unsigned long flags; 893 unsigned long resolution = 0; 894 struct snd_timer_instance *ti, *ts; 895 896 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 897 return; 898 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 899 event > SNDRV_TIMER_EVENT_MRESUME)) 900 return; 901 spin_lock_irqsave(&timer->lock, flags); 902 if (event == SNDRV_TIMER_EVENT_MSTART || 903 event == SNDRV_TIMER_EVENT_MCONTINUE || 904 event == SNDRV_TIMER_EVENT_MRESUME) { 905 if (timer->hw.c_resolution) 906 resolution = timer->hw.c_resolution(timer); 907 else 908 resolution = timer->hw.resolution; 909 } 910 list_for_each_entry(ti, &timer->active_list_head, active_list) { 911 if (ti->ccallback) 912 ti->ccallback(ti, event, tstamp, resolution); 913 list_for_each_entry(ts, &ti->slave_active_head, active_list) 914 if (ts->ccallback) 915 ts->ccallback(ts, event, tstamp, resolution); 916 } 917 spin_unlock_irqrestore(&timer->lock, flags); 918 } 919 920 /* 921 * exported functions for global timers 922 */ 923 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 924 { 925 struct snd_timer_id tid; 926 927 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 928 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 929 tid.card = -1; 930 tid.device = device; 931 tid.subdevice = 0; 932 return snd_timer_new(NULL, id, &tid, rtimer); 933 } 934 935 int snd_timer_global_free(struct snd_timer *timer) 936 { 937 return snd_timer_free(timer); 938 } 939 940 int snd_timer_global_register(struct snd_timer *timer) 941 { 942 struct snd_device dev; 943 944 memset(&dev, 0, sizeof(dev)); 945 dev.device_data = timer; 946 return snd_timer_dev_register(&dev); 947 } 948 949 /* 950 * System timer 951 */ 952 953 struct snd_timer_system_private { 954 struct timer_list tlist; 955 unsigned long last_expires; 956 unsigned long last_jiffies; 957 unsigned long correction; 958 }; 959 960 static void snd_timer_s_function(unsigned long data) 961 { 962 struct snd_timer *timer = (struct snd_timer *)data; 963 struct snd_timer_system_private *priv = timer->private_data; 964 unsigned long jiff = jiffies; 965 if (time_after(jiff, priv->last_expires)) 966 priv->correction += (long)jiff - (long)priv->last_expires; 967 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 968 } 969 970 static int snd_timer_s_start(struct snd_timer * timer) 971 { 972 struct snd_timer_system_private *priv; 973 unsigned long njiff; 974 975 priv = (struct snd_timer_system_private *) timer->private_data; 976 njiff = (priv->last_jiffies = jiffies); 977 if (priv->correction > timer->sticks - 1) { 978 priv->correction -= timer->sticks - 1; 979 njiff++; 980 } else { 981 njiff += timer->sticks - priv->correction; 982 priv->correction = 0; 983 } 984 priv->last_expires = priv->tlist.expires = njiff; 985 add_timer(&priv->tlist); 986 return 0; 987 } 988 989 static int snd_timer_s_stop(struct snd_timer * timer) 990 { 991 struct snd_timer_system_private *priv; 992 unsigned long jiff; 993 994 priv = (struct snd_timer_system_private *) timer->private_data; 995 del_timer(&priv->tlist); 996 jiff = jiffies; 997 if (time_before(jiff, priv->last_expires)) 998 timer->sticks = priv->last_expires - jiff; 999 else 1000 timer->sticks = 1; 1001 priv->correction = 0; 1002 return 0; 1003 } 1004 1005 static struct snd_timer_hardware snd_timer_system = 1006 { 1007 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1008 .resolution = 1000000000L / HZ, 1009 .ticks = 10000000L, 1010 .start = snd_timer_s_start, 1011 .stop = snd_timer_s_stop 1012 }; 1013 1014 static void snd_timer_free_system(struct snd_timer *timer) 1015 { 1016 kfree(timer->private_data); 1017 } 1018 1019 static int snd_timer_register_system(void) 1020 { 1021 struct snd_timer *timer; 1022 struct snd_timer_system_private *priv; 1023 int err; 1024 1025 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1026 if (err < 0) 1027 return err; 1028 strcpy(timer->name, "system timer"); 1029 timer->hw = snd_timer_system; 1030 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1031 if (priv == NULL) { 1032 snd_timer_free(timer); 1033 return -ENOMEM; 1034 } 1035 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1036 timer->private_data = priv; 1037 timer->private_free = snd_timer_free_system; 1038 return snd_timer_global_register(timer); 1039 } 1040 1041 #ifdef CONFIG_SND_PROC_FS 1042 /* 1043 * Info interface 1044 */ 1045 1046 static void snd_timer_proc_read(struct snd_info_entry *entry, 1047 struct snd_info_buffer *buffer) 1048 { 1049 struct snd_timer *timer; 1050 struct snd_timer_instance *ti; 1051 1052 mutex_lock(®ister_mutex); 1053 list_for_each_entry(timer, &snd_timer_list, device_list) { 1054 switch (timer->tmr_class) { 1055 case SNDRV_TIMER_CLASS_GLOBAL: 1056 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1057 break; 1058 case SNDRV_TIMER_CLASS_CARD: 1059 snd_iprintf(buffer, "C%i-%i: ", 1060 timer->card->number, timer->tmr_device); 1061 break; 1062 case SNDRV_TIMER_CLASS_PCM: 1063 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1064 timer->tmr_device, timer->tmr_subdevice); 1065 break; 1066 default: 1067 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1068 timer->card ? timer->card->number : -1, 1069 timer->tmr_device, timer->tmr_subdevice); 1070 } 1071 snd_iprintf(buffer, "%s :", timer->name); 1072 if (timer->hw.resolution) 1073 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1074 timer->hw.resolution / 1000, 1075 timer->hw.resolution % 1000, 1076 timer->hw.ticks); 1077 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1078 snd_iprintf(buffer, " SLAVE"); 1079 snd_iprintf(buffer, "\n"); 1080 list_for_each_entry(ti, &timer->open_list_head, open_list) 1081 snd_iprintf(buffer, " Client %s : %s\n", 1082 ti->owner ? ti->owner : "unknown", 1083 ti->flags & (SNDRV_TIMER_IFLG_START | 1084 SNDRV_TIMER_IFLG_RUNNING) 1085 ? "running" : "stopped"); 1086 } 1087 mutex_unlock(®ister_mutex); 1088 } 1089 1090 static struct snd_info_entry *snd_timer_proc_entry; 1091 1092 static void __init snd_timer_proc_init(void) 1093 { 1094 struct snd_info_entry *entry; 1095 1096 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1097 if (entry != NULL) { 1098 entry->c.text.read = snd_timer_proc_read; 1099 if (snd_info_register(entry) < 0) { 1100 snd_info_free_entry(entry); 1101 entry = NULL; 1102 } 1103 } 1104 snd_timer_proc_entry = entry; 1105 } 1106 1107 static void __exit snd_timer_proc_done(void) 1108 { 1109 snd_info_free_entry(snd_timer_proc_entry); 1110 } 1111 #else /* !CONFIG_SND_PROC_FS */ 1112 #define snd_timer_proc_init() 1113 #define snd_timer_proc_done() 1114 #endif 1115 1116 /* 1117 * USER SPACE interface 1118 */ 1119 1120 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1121 unsigned long resolution, 1122 unsigned long ticks) 1123 { 1124 struct snd_timer_user *tu = timeri->callback_data; 1125 struct snd_timer_read *r; 1126 int prev; 1127 1128 spin_lock(&tu->qlock); 1129 if (tu->qused > 0) { 1130 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1131 r = &tu->queue[prev]; 1132 if (r->resolution == resolution) { 1133 r->ticks += ticks; 1134 goto __wake; 1135 } 1136 } 1137 if (tu->qused >= tu->queue_size) { 1138 tu->overrun++; 1139 } else { 1140 r = &tu->queue[tu->qtail++]; 1141 tu->qtail %= tu->queue_size; 1142 r->resolution = resolution; 1143 r->ticks = ticks; 1144 tu->qused++; 1145 } 1146 __wake: 1147 spin_unlock(&tu->qlock); 1148 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1149 wake_up(&tu->qchange_sleep); 1150 } 1151 1152 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1153 struct snd_timer_tread *tread) 1154 { 1155 if (tu->qused >= tu->queue_size) { 1156 tu->overrun++; 1157 } else { 1158 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1159 tu->qtail %= tu->queue_size; 1160 tu->qused++; 1161 } 1162 } 1163 1164 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1165 int event, 1166 struct timespec *tstamp, 1167 unsigned long resolution) 1168 { 1169 struct snd_timer_user *tu = timeri->callback_data; 1170 struct snd_timer_tread r1; 1171 unsigned long flags; 1172 1173 if (event >= SNDRV_TIMER_EVENT_START && 1174 event <= SNDRV_TIMER_EVENT_PAUSE) 1175 tu->tstamp = *tstamp; 1176 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1177 return; 1178 r1.event = event; 1179 r1.tstamp = *tstamp; 1180 r1.val = resolution; 1181 spin_lock_irqsave(&tu->qlock, flags); 1182 snd_timer_user_append_to_tqueue(tu, &r1); 1183 spin_unlock_irqrestore(&tu->qlock, flags); 1184 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1185 wake_up(&tu->qchange_sleep); 1186 } 1187 1188 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1189 unsigned long resolution, 1190 unsigned long ticks) 1191 { 1192 struct snd_timer_user *tu = timeri->callback_data; 1193 struct snd_timer_tread *r, r1; 1194 struct timespec tstamp; 1195 int prev, append = 0; 1196 1197 memset(&tstamp, 0, sizeof(tstamp)); 1198 spin_lock(&tu->qlock); 1199 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1200 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1201 spin_unlock(&tu->qlock); 1202 return; 1203 } 1204 if (tu->last_resolution != resolution || ticks > 0) { 1205 if (timer_tstamp_monotonic) 1206 ktime_get_ts(&tstamp); 1207 else 1208 getnstimeofday(&tstamp); 1209 } 1210 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1211 tu->last_resolution != resolution) { 1212 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1213 r1.tstamp = tstamp; 1214 r1.val = resolution; 1215 snd_timer_user_append_to_tqueue(tu, &r1); 1216 tu->last_resolution = resolution; 1217 append++; 1218 } 1219 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1220 goto __wake; 1221 if (ticks == 0) 1222 goto __wake; 1223 if (tu->qused > 0) { 1224 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1225 r = &tu->tqueue[prev]; 1226 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1227 r->tstamp = tstamp; 1228 r->val += ticks; 1229 append++; 1230 goto __wake; 1231 } 1232 } 1233 r1.event = SNDRV_TIMER_EVENT_TICK; 1234 r1.tstamp = tstamp; 1235 r1.val = ticks; 1236 snd_timer_user_append_to_tqueue(tu, &r1); 1237 append++; 1238 __wake: 1239 spin_unlock(&tu->qlock); 1240 if (append == 0) 1241 return; 1242 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1243 wake_up(&tu->qchange_sleep); 1244 } 1245 1246 static int snd_timer_user_open(struct inode *inode, struct file *file) 1247 { 1248 struct snd_timer_user *tu; 1249 int err; 1250 1251 err = nonseekable_open(inode, file); 1252 if (err < 0) 1253 return err; 1254 1255 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1256 if (tu == NULL) 1257 return -ENOMEM; 1258 spin_lock_init(&tu->qlock); 1259 init_waitqueue_head(&tu->qchange_sleep); 1260 mutex_init(&tu->ioctl_lock); 1261 tu->ticks = 1; 1262 tu->queue_size = 128; 1263 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1264 GFP_KERNEL); 1265 if (tu->queue == NULL) { 1266 kfree(tu); 1267 return -ENOMEM; 1268 } 1269 file->private_data = tu; 1270 return 0; 1271 } 1272 1273 static int snd_timer_user_release(struct inode *inode, struct file *file) 1274 { 1275 struct snd_timer_user *tu; 1276 1277 if (file->private_data) { 1278 tu = file->private_data; 1279 file->private_data = NULL; 1280 mutex_lock(&tu->ioctl_lock); 1281 if (tu->timeri) 1282 snd_timer_close(tu->timeri); 1283 mutex_unlock(&tu->ioctl_lock); 1284 kfree(tu->queue); 1285 kfree(tu->tqueue); 1286 kfree(tu); 1287 } 1288 return 0; 1289 } 1290 1291 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1292 { 1293 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1294 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1295 id->card = -1; 1296 id->device = -1; 1297 id->subdevice = -1; 1298 } 1299 1300 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1301 { 1302 id->dev_class = timer->tmr_class; 1303 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1304 id->card = timer->card ? timer->card->number : -1; 1305 id->device = timer->tmr_device; 1306 id->subdevice = timer->tmr_subdevice; 1307 } 1308 1309 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1310 { 1311 struct snd_timer_id id; 1312 struct snd_timer *timer; 1313 struct list_head *p; 1314 1315 if (copy_from_user(&id, _tid, sizeof(id))) 1316 return -EFAULT; 1317 mutex_lock(®ister_mutex); 1318 if (id.dev_class < 0) { /* first item */ 1319 if (list_empty(&snd_timer_list)) 1320 snd_timer_user_zero_id(&id); 1321 else { 1322 timer = list_entry(snd_timer_list.next, 1323 struct snd_timer, device_list); 1324 snd_timer_user_copy_id(&id, timer); 1325 } 1326 } else { 1327 switch (id.dev_class) { 1328 case SNDRV_TIMER_CLASS_GLOBAL: 1329 id.device = id.device < 0 ? 0 : id.device + 1; 1330 list_for_each(p, &snd_timer_list) { 1331 timer = list_entry(p, struct snd_timer, device_list); 1332 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1333 snd_timer_user_copy_id(&id, timer); 1334 break; 1335 } 1336 if (timer->tmr_device >= id.device) { 1337 snd_timer_user_copy_id(&id, timer); 1338 break; 1339 } 1340 } 1341 if (p == &snd_timer_list) 1342 snd_timer_user_zero_id(&id); 1343 break; 1344 case SNDRV_TIMER_CLASS_CARD: 1345 case SNDRV_TIMER_CLASS_PCM: 1346 if (id.card < 0) { 1347 id.card = 0; 1348 } else { 1349 if (id.card < 0) { 1350 id.card = 0; 1351 } else { 1352 if (id.device < 0) { 1353 id.device = 0; 1354 } else { 1355 if (id.subdevice < 0) { 1356 id.subdevice = 0; 1357 } else { 1358 id.subdevice++; 1359 } 1360 } 1361 } 1362 } 1363 list_for_each(p, &snd_timer_list) { 1364 timer = list_entry(p, struct snd_timer, device_list); 1365 if (timer->tmr_class > id.dev_class) { 1366 snd_timer_user_copy_id(&id, timer); 1367 break; 1368 } 1369 if (timer->tmr_class < id.dev_class) 1370 continue; 1371 if (timer->card->number > id.card) { 1372 snd_timer_user_copy_id(&id, timer); 1373 break; 1374 } 1375 if (timer->card->number < id.card) 1376 continue; 1377 if (timer->tmr_device > id.device) { 1378 snd_timer_user_copy_id(&id, timer); 1379 break; 1380 } 1381 if (timer->tmr_device < id.device) 1382 continue; 1383 if (timer->tmr_subdevice > id.subdevice) { 1384 snd_timer_user_copy_id(&id, timer); 1385 break; 1386 } 1387 if (timer->tmr_subdevice < id.subdevice) 1388 continue; 1389 snd_timer_user_copy_id(&id, timer); 1390 break; 1391 } 1392 if (p == &snd_timer_list) 1393 snd_timer_user_zero_id(&id); 1394 break; 1395 default: 1396 snd_timer_user_zero_id(&id); 1397 } 1398 } 1399 mutex_unlock(®ister_mutex); 1400 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1401 return -EFAULT; 1402 return 0; 1403 } 1404 1405 static int snd_timer_user_ginfo(struct file *file, 1406 struct snd_timer_ginfo __user *_ginfo) 1407 { 1408 struct snd_timer_ginfo *ginfo; 1409 struct snd_timer_id tid; 1410 struct snd_timer *t; 1411 struct list_head *p; 1412 int err = 0; 1413 1414 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1415 if (IS_ERR(ginfo)) 1416 return PTR_ERR(ginfo); 1417 1418 tid = ginfo->tid; 1419 memset(ginfo, 0, sizeof(*ginfo)); 1420 ginfo->tid = tid; 1421 mutex_lock(®ister_mutex); 1422 t = snd_timer_find(&tid); 1423 if (t != NULL) { 1424 ginfo->card = t->card ? t->card->number : -1; 1425 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1426 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1427 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1428 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1429 ginfo->resolution = t->hw.resolution; 1430 if (t->hw.resolution_min > 0) { 1431 ginfo->resolution_min = t->hw.resolution_min; 1432 ginfo->resolution_max = t->hw.resolution_max; 1433 } 1434 list_for_each(p, &t->open_list_head) { 1435 ginfo->clients++; 1436 } 1437 } else { 1438 err = -ENODEV; 1439 } 1440 mutex_unlock(®ister_mutex); 1441 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1442 err = -EFAULT; 1443 kfree(ginfo); 1444 return err; 1445 } 1446 1447 static int snd_timer_user_gparams(struct file *file, 1448 struct snd_timer_gparams __user *_gparams) 1449 { 1450 struct snd_timer_gparams gparams; 1451 struct snd_timer *t; 1452 int err; 1453 1454 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1455 return -EFAULT; 1456 mutex_lock(®ister_mutex); 1457 t = snd_timer_find(&gparams.tid); 1458 if (!t) { 1459 err = -ENODEV; 1460 goto _error; 1461 } 1462 if (!list_empty(&t->open_list_head)) { 1463 err = -EBUSY; 1464 goto _error; 1465 } 1466 if (!t->hw.set_period) { 1467 err = -ENOSYS; 1468 goto _error; 1469 } 1470 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1471 _error: 1472 mutex_unlock(®ister_mutex); 1473 return err; 1474 } 1475 1476 static int snd_timer_user_gstatus(struct file *file, 1477 struct snd_timer_gstatus __user *_gstatus) 1478 { 1479 struct snd_timer_gstatus gstatus; 1480 struct snd_timer_id tid; 1481 struct snd_timer *t; 1482 int err = 0; 1483 1484 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1485 return -EFAULT; 1486 tid = gstatus.tid; 1487 memset(&gstatus, 0, sizeof(gstatus)); 1488 gstatus.tid = tid; 1489 mutex_lock(®ister_mutex); 1490 t = snd_timer_find(&tid); 1491 if (t != NULL) { 1492 if (t->hw.c_resolution) 1493 gstatus.resolution = t->hw.c_resolution(t); 1494 else 1495 gstatus.resolution = t->hw.resolution; 1496 if (t->hw.precise_resolution) { 1497 t->hw.precise_resolution(t, &gstatus.resolution_num, 1498 &gstatus.resolution_den); 1499 } else { 1500 gstatus.resolution_num = gstatus.resolution; 1501 gstatus.resolution_den = 1000000000uL; 1502 } 1503 } else { 1504 err = -ENODEV; 1505 } 1506 mutex_unlock(®ister_mutex); 1507 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1508 err = -EFAULT; 1509 return err; 1510 } 1511 1512 static int snd_timer_user_tselect(struct file *file, 1513 struct snd_timer_select __user *_tselect) 1514 { 1515 struct snd_timer_user *tu; 1516 struct snd_timer_select tselect; 1517 char str[32]; 1518 int err = 0; 1519 1520 tu = file->private_data; 1521 if (tu->timeri) { 1522 snd_timer_close(tu->timeri); 1523 tu->timeri = NULL; 1524 } 1525 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1526 err = -EFAULT; 1527 goto __err; 1528 } 1529 sprintf(str, "application %i", current->pid); 1530 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1531 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1532 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1533 if (err < 0) 1534 goto __err; 1535 1536 kfree(tu->queue); 1537 tu->queue = NULL; 1538 kfree(tu->tqueue); 1539 tu->tqueue = NULL; 1540 if (tu->tread) { 1541 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1542 GFP_KERNEL); 1543 if (tu->tqueue == NULL) 1544 err = -ENOMEM; 1545 } else { 1546 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1547 GFP_KERNEL); 1548 if (tu->queue == NULL) 1549 err = -ENOMEM; 1550 } 1551 1552 if (err < 0) { 1553 snd_timer_close(tu->timeri); 1554 tu->timeri = NULL; 1555 } else { 1556 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1557 tu->timeri->callback = tu->tread 1558 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1559 tu->timeri->ccallback = snd_timer_user_ccallback; 1560 tu->timeri->callback_data = (void *)tu; 1561 } 1562 1563 __err: 1564 return err; 1565 } 1566 1567 static int snd_timer_user_info(struct file *file, 1568 struct snd_timer_info __user *_info) 1569 { 1570 struct snd_timer_user *tu; 1571 struct snd_timer_info *info; 1572 struct snd_timer *t; 1573 int err = 0; 1574 1575 tu = file->private_data; 1576 if (!tu->timeri) 1577 return -EBADFD; 1578 t = tu->timeri->timer; 1579 if (!t) 1580 return -EBADFD; 1581 1582 info = kzalloc(sizeof(*info), GFP_KERNEL); 1583 if (! info) 1584 return -ENOMEM; 1585 info->card = t->card ? t->card->number : -1; 1586 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1587 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1588 strlcpy(info->id, t->id, sizeof(info->id)); 1589 strlcpy(info->name, t->name, sizeof(info->name)); 1590 info->resolution = t->hw.resolution; 1591 if (copy_to_user(_info, info, sizeof(*_info))) 1592 err = -EFAULT; 1593 kfree(info); 1594 return err; 1595 } 1596 1597 static int snd_timer_user_params(struct file *file, 1598 struct snd_timer_params __user *_params) 1599 { 1600 struct snd_timer_user *tu; 1601 struct snd_timer_params params; 1602 struct snd_timer *t; 1603 struct snd_timer_read *tr; 1604 struct snd_timer_tread *ttr; 1605 int err; 1606 1607 tu = file->private_data; 1608 if (!tu->timeri) 1609 return -EBADFD; 1610 t = tu->timeri->timer; 1611 if (!t) 1612 return -EBADFD; 1613 if (copy_from_user(¶ms, _params, sizeof(params))) 1614 return -EFAULT; 1615 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1616 err = -EINVAL; 1617 goto _end; 1618 } 1619 if (params.queue_size > 0 && 1620 (params.queue_size < 32 || params.queue_size > 1024)) { 1621 err = -EINVAL; 1622 goto _end; 1623 } 1624 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1625 (1<<SNDRV_TIMER_EVENT_TICK)| 1626 (1<<SNDRV_TIMER_EVENT_START)| 1627 (1<<SNDRV_TIMER_EVENT_STOP)| 1628 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1629 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1630 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1631 (1<<SNDRV_TIMER_EVENT_RESUME)| 1632 (1<<SNDRV_TIMER_EVENT_MSTART)| 1633 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1634 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1635 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1636 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1637 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1638 err = -EINVAL; 1639 goto _end; 1640 } 1641 snd_timer_stop(tu->timeri); 1642 spin_lock_irq(&t->lock); 1643 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1644 SNDRV_TIMER_IFLG_EXCLUSIVE| 1645 SNDRV_TIMER_IFLG_EARLY_EVENT); 1646 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1647 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1648 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1649 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1650 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1651 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1652 spin_unlock_irq(&t->lock); 1653 if (params.queue_size > 0 && 1654 (unsigned int)tu->queue_size != params.queue_size) { 1655 if (tu->tread) { 1656 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1657 GFP_KERNEL); 1658 if (ttr) { 1659 kfree(tu->tqueue); 1660 tu->queue_size = params.queue_size; 1661 tu->tqueue = ttr; 1662 } 1663 } else { 1664 tr = kmalloc(params.queue_size * sizeof(*tr), 1665 GFP_KERNEL); 1666 if (tr) { 1667 kfree(tu->queue); 1668 tu->queue_size = params.queue_size; 1669 tu->queue = tr; 1670 } 1671 } 1672 } 1673 tu->qhead = tu->qtail = tu->qused = 0; 1674 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1675 if (tu->tread) { 1676 struct snd_timer_tread tread; 1677 tread.event = SNDRV_TIMER_EVENT_EARLY; 1678 tread.tstamp.tv_sec = 0; 1679 tread.tstamp.tv_nsec = 0; 1680 tread.val = 0; 1681 snd_timer_user_append_to_tqueue(tu, &tread); 1682 } else { 1683 struct snd_timer_read *r = &tu->queue[0]; 1684 r->resolution = 0; 1685 r->ticks = 0; 1686 tu->qused++; 1687 tu->qtail++; 1688 } 1689 } 1690 tu->filter = params.filter; 1691 tu->ticks = params.ticks; 1692 err = 0; 1693 _end: 1694 if (copy_to_user(_params, ¶ms, sizeof(params))) 1695 return -EFAULT; 1696 return err; 1697 } 1698 1699 static int snd_timer_user_status(struct file *file, 1700 struct snd_timer_status __user *_status) 1701 { 1702 struct snd_timer_user *tu; 1703 struct snd_timer_status status; 1704 1705 tu = file->private_data; 1706 if (!tu->timeri) 1707 return -EBADFD; 1708 memset(&status, 0, sizeof(status)); 1709 status.tstamp = tu->tstamp; 1710 status.resolution = snd_timer_resolution(tu->timeri); 1711 status.lost = tu->timeri->lost; 1712 status.overrun = tu->overrun; 1713 spin_lock_irq(&tu->qlock); 1714 status.queue = tu->qused; 1715 spin_unlock_irq(&tu->qlock); 1716 if (copy_to_user(_status, &status, sizeof(status))) 1717 return -EFAULT; 1718 return 0; 1719 } 1720 1721 static int snd_timer_user_start(struct file *file) 1722 { 1723 int err; 1724 struct snd_timer_user *tu; 1725 1726 tu = file->private_data; 1727 if (!tu->timeri) 1728 return -EBADFD; 1729 snd_timer_stop(tu->timeri); 1730 tu->timeri->lost = 0; 1731 tu->last_resolution = 0; 1732 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1733 } 1734 1735 static int snd_timer_user_stop(struct file *file) 1736 { 1737 int err; 1738 struct snd_timer_user *tu; 1739 1740 tu = file->private_data; 1741 if (!tu->timeri) 1742 return -EBADFD; 1743 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1744 } 1745 1746 static int snd_timer_user_continue(struct file *file) 1747 { 1748 int err; 1749 struct snd_timer_user *tu; 1750 1751 tu = file->private_data; 1752 if (!tu->timeri) 1753 return -EBADFD; 1754 tu->timeri->lost = 0; 1755 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1756 } 1757 1758 static int snd_timer_user_pause(struct file *file) 1759 { 1760 int err; 1761 struct snd_timer_user *tu; 1762 1763 tu = file->private_data; 1764 if (!tu->timeri) 1765 return -EBADFD; 1766 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1767 } 1768 1769 enum { 1770 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1771 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1772 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1773 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1774 }; 1775 1776 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1777 unsigned long arg) 1778 { 1779 struct snd_timer_user *tu; 1780 void __user *argp = (void __user *)arg; 1781 int __user *p = argp; 1782 1783 tu = file->private_data; 1784 switch (cmd) { 1785 case SNDRV_TIMER_IOCTL_PVERSION: 1786 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1787 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1788 return snd_timer_user_next_device(argp); 1789 case SNDRV_TIMER_IOCTL_TREAD: 1790 { 1791 int xarg; 1792 1793 if (tu->timeri) /* too late */ 1794 return -EBUSY; 1795 if (get_user(xarg, p)) 1796 return -EFAULT; 1797 tu->tread = xarg ? 1 : 0; 1798 return 0; 1799 } 1800 case SNDRV_TIMER_IOCTL_GINFO: 1801 return snd_timer_user_ginfo(file, argp); 1802 case SNDRV_TIMER_IOCTL_GPARAMS: 1803 return snd_timer_user_gparams(file, argp); 1804 case SNDRV_TIMER_IOCTL_GSTATUS: 1805 return snd_timer_user_gstatus(file, argp); 1806 case SNDRV_TIMER_IOCTL_SELECT: 1807 return snd_timer_user_tselect(file, argp); 1808 case SNDRV_TIMER_IOCTL_INFO: 1809 return snd_timer_user_info(file, argp); 1810 case SNDRV_TIMER_IOCTL_PARAMS: 1811 return snd_timer_user_params(file, argp); 1812 case SNDRV_TIMER_IOCTL_STATUS: 1813 return snd_timer_user_status(file, argp); 1814 case SNDRV_TIMER_IOCTL_START: 1815 case SNDRV_TIMER_IOCTL_START_OLD: 1816 return snd_timer_user_start(file); 1817 case SNDRV_TIMER_IOCTL_STOP: 1818 case SNDRV_TIMER_IOCTL_STOP_OLD: 1819 return snd_timer_user_stop(file); 1820 case SNDRV_TIMER_IOCTL_CONTINUE: 1821 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1822 return snd_timer_user_continue(file); 1823 case SNDRV_TIMER_IOCTL_PAUSE: 1824 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1825 return snd_timer_user_pause(file); 1826 } 1827 return -ENOTTY; 1828 } 1829 1830 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1831 unsigned long arg) 1832 { 1833 struct snd_timer_user *tu = file->private_data; 1834 long ret; 1835 1836 mutex_lock(&tu->ioctl_lock); 1837 ret = __snd_timer_user_ioctl(file, cmd, arg); 1838 mutex_unlock(&tu->ioctl_lock); 1839 return ret; 1840 } 1841 1842 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1843 { 1844 struct snd_timer_user *tu; 1845 1846 tu = file->private_data; 1847 return fasync_helper(fd, file, on, &tu->fasync); 1848 } 1849 1850 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1851 size_t count, loff_t *offset) 1852 { 1853 struct snd_timer_user *tu; 1854 long result = 0, unit; 1855 int err = 0; 1856 1857 tu = file->private_data; 1858 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1859 spin_lock_irq(&tu->qlock); 1860 while ((long)count - result >= unit) { 1861 while (!tu->qused) { 1862 wait_queue_t wait; 1863 1864 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1865 err = -EAGAIN; 1866 break; 1867 } 1868 1869 set_current_state(TASK_INTERRUPTIBLE); 1870 init_waitqueue_entry(&wait, current); 1871 add_wait_queue(&tu->qchange_sleep, &wait); 1872 1873 spin_unlock_irq(&tu->qlock); 1874 schedule(); 1875 spin_lock_irq(&tu->qlock); 1876 1877 remove_wait_queue(&tu->qchange_sleep, &wait); 1878 1879 if (signal_pending(current)) { 1880 err = -ERESTARTSYS; 1881 break; 1882 } 1883 } 1884 1885 spin_unlock_irq(&tu->qlock); 1886 if (err < 0) 1887 goto _error; 1888 1889 if (tu->tread) { 1890 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1891 sizeof(struct snd_timer_tread))) { 1892 err = -EFAULT; 1893 goto _error; 1894 } 1895 } else { 1896 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1897 sizeof(struct snd_timer_read))) { 1898 err = -EFAULT; 1899 goto _error; 1900 } 1901 } 1902 1903 tu->qhead %= tu->queue_size; 1904 1905 result += unit; 1906 buffer += unit; 1907 1908 spin_lock_irq(&tu->qlock); 1909 tu->qused--; 1910 } 1911 spin_unlock_irq(&tu->qlock); 1912 _error: 1913 return result > 0 ? result : err; 1914 } 1915 1916 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1917 { 1918 unsigned int mask; 1919 struct snd_timer_user *tu; 1920 1921 tu = file->private_data; 1922 1923 poll_wait(file, &tu->qchange_sleep, wait); 1924 1925 mask = 0; 1926 if (tu->qused) 1927 mask |= POLLIN | POLLRDNORM; 1928 1929 return mask; 1930 } 1931 1932 #ifdef CONFIG_COMPAT 1933 #include "timer_compat.c" 1934 #else 1935 #define snd_timer_user_ioctl_compat NULL 1936 #endif 1937 1938 static const struct file_operations snd_timer_f_ops = 1939 { 1940 .owner = THIS_MODULE, 1941 .read = snd_timer_user_read, 1942 .open = snd_timer_user_open, 1943 .release = snd_timer_user_release, 1944 .llseek = no_llseek, 1945 .poll = snd_timer_user_poll, 1946 .unlocked_ioctl = snd_timer_user_ioctl, 1947 .compat_ioctl = snd_timer_user_ioctl_compat, 1948 .fasync = snd_timer_user_fasync, 1949 }; 1950 1951 /* unregister the system timer */ 1952 static void snd_timer_free_all(void) 1953 { 1954 struct snd_timer *timer, *n; 1955 1956 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 1957 snd_timer_free(timer); 1958 } 1959 1960 static struct device timer_dev; 1961 1962 /* 1963 * ENTRY functions 1964 */ 1965 1966 static int __init alsa_timer_init(void) 1967 { 1968 int err; 1969 1970 snd_device_initialize(&timer_dev, NULL); 1971 dev_set_name(&timer_dev, "timer"); 1972 1973 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 1974 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 1975 "system timer"); 1976 #endif 1977 1978 err = snd_timer_register_system(); 1979 if (err < 0) { 1980 pr_err("ALSA: unable to register system timer (%i)\n", err); 1981 put_device(&timer_dev); 1982 return err; 1983 } 1984 1985 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 1986 &snd_timer_f_ops, NULL, &timer_dev); 1987 if (err < 0) { 1988 pr_err("ALSA: unable to register timer device (%i)\n", err); 1989 snd_timer_free_all(); 1990 put_device(&timer_dev); 1991 return err; 1992 } 1993 1994 snd_timer_proc_init(); 1995 return 0; 1996 } 1997 1998 static void __exit alsa_timer_exit(void) 1999 { 2000 snd_unregister_device(&timer_dev); 2001 snd_timer_free_all(); 2002 put_device(&timer_dev); 2003 snd_timer_proc_done(); 2004 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2005 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2006 #endif 2007 } 2008 2009 module_init(alsa_timer_init) 2010 module_exit(alsa_timer_exit) 2011 2012 EXPORT_SYMBOL(snd_timer_open); 2013 EXPORT_SYMBOL(snd_timer_close); 2014 EXPORT_SYMBOL(snd_timer_resolution); 2015 EXPORT_SYMBOL(snd_timer_start); 2016 EXPORT_SYMBOL(snd_timer_stop); 2017 EXPORT_SYMBOL(snd_timer_continue); 2018 EXPORT_SYMBOL(snd_timer_pause); 2019 EXPORT_SYMBOL(snd_timer_new); 2020 EXPORT_SYMBOL(snd_timer_notify); 2021 EXPORT_SYMBOL(snd_timer_global_new); 2022 EXPORT_SYMBOL(snd_timer_global_free); 2023 EXPORT_SYMBOL(snd_timer_global_register); 2024 EXPORT_SYMBOL(snd_timer_interrupt); 2025