1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/delay.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/device.h> 28 #include <linux/module.h> 29 #include <linux/string.h> 30 #include <sound/core.h> 31 #include <sound/timer.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/minors.h> 35 #include <sound/initval.h> 36 #include <linux/kmod.h> 37 38 #if IS_ENABLED(CONFIG_SND_HRTIMER) 39 #define DEFAULT_TIMER_LIMIT 4 40 #else 41 #define DEFAULT_TIMER_LIMIT 1 42 #endif 43 44 static int timer_limit = DEFAULT_TIMER_LIMIT; 45 static int timer_tstamp_monotonic = 1; 46 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 47 MODULE_DESCRIPTION("ALSA timer interface"); 48 MODULE_LICENSE("GPL"); 49 module_param(timer_limit, int, 0444); 50 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 51 module_param(timer_tstamp_monotonic, int, 0444); 52 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 53 54 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 55 MODULE_ALIAS("devname:snd/timer"); 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 bool disconnected; 67 struct snd_timer_read *queue; 68 struct snd_timer_tread *tqueue; 69 spinlock_t qlock; 70 unsigned long last_resolution; 71 unsigned int filter; 72 struct timespec tstamp; /* trigger tstamp */ 73 wait_queue_head_t qchange_sleep; 74 struct fasync_struct *fasync; 75 struct mutex ioctl_lock; 76 }; 77 78 /* list of timers */ 79 static LIST_HEAD(snd_timer_list); 80 81 /* list of slave instances */ 82 static LIST_HEAD(snd_timer_slave_list); 83 84 /* lock for slave active lists */ 85 static DEFINE_SPINLOCK(slave_active_lock); 86 87 static DEFINE_MUTEX(register_mutex); 88 89 static int snd_timer_free(struct snd_timer *timer); 90 static int snd_timer_dev_free(struct snd_device *device); 91 static int snd_timer_dev_register(struct snd_device *device); 92 static int snd_timer_dev_disconnect(struct snd_device *device); 93 94 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 95 96 /* 97 * create a timer instance with the given owner string. 98 * when timer is not NULL, increments the module counter 99 */ 100 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 101 struct snd_timer *timer) 102 { 103 struct snd_timer_instance *timeri; 104 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 105 if (timeri == NULL) 106 return NULL; 107 timeri->owner = kstrdup(owner, GFP_KERNEL); 108 if (! timeri->owner) { 109 kfree(timeri); 110 return NULL; 111 } 112 INIT_LIST_HEAD(&timeri->open_list); 113 INIT_LIST_HEAD(&timeri->active_list); 114 INIT_LIST_HEAD(&timeri->ack_list); 115 INIT_LIST_HEAD(&timeri->slave_list_head); 116 INIT_LIST_HEAD(&timeri->slave_active_head); 117 118 timeri->timer = timer; 119 if (timer && !try_module_get(timer->module)) { 120 kfree(timeri->owner); 121 kfree(timeri); 122 return NULL; 123 } 124 125 return timeri; 126 } 127 128 /* 129 * find a timer instance from the given timer id 130 */ 131 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 132 { 133 struct snd_timer *timer = NULL; 134 135 list_for_each_entry(timer, &snd_timer_list, device_list) { 136 if (timer->tmr_class != tid->dev_class) 137 continue; 138 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 139 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 140 (timer->card == NULL || 141 timer->card->number != tid->card)) 142 continue; 143 if (timer->tmr_device != tid->device) 144 continue; 145 if (timer->tmr_subdevice != tid->subdevice) 146 continue; 147 return timer; 148 } 149 return NULL; 150 } 151 152 #ifdef CONFIG_MODULES 153 154 static void snd_timer_request(struct snd_timer_id *tid) 155 { 156 switch (tid->dev_class) { 157 case SNDRV_TIMER_CLASS_GLOBAL: 158 if (tid->device < timer_limit) 159 request_module("snd-timer-%i", tid->device); 160 break; 161 case SNDRV_TIMER_CLASS_CARD: 162 case SNDRV_TIMER_CLASS_PCM: 163 if (tid->card < snd_ecards_limit) 164 request_module("snd-card-%i", tid->card); 165 break; 166 default: 167 break; 168 } 169 } 170 171 #endif 172 173 /* 174 * look for a master instance matching with the slave id of the given slave. 175 * when found, relink the open_link of the slave. 176 * 177 * call this with register_mutex down. 178 */ 179 static void snd_timer_check_slave(struct snd_timer_instance *slave) 180 { 181 struct snd_timer *timer; 182 struct snd_timer_instance *master; 183 184 /* FIXME: it's really dumb to look up all entries.. */ 185 list_for_each_entry(timer, &snd_timer_list, device_list) { 186 list_for_each_entry(master, &timer->open_list_head, open_list) { 187 if (slave->slave_class == master->slave_class && 188 slave->slave_id == master->slave_id) { 189 list_move_tail(&slave->open_list, 190 &master->slave_list_head); 191 spin_lock_irq(&slave_active_lock); 192 slave->master = master; 193 slave->timer = master->timer; 194 spin_unlock_irq(&slave_active_lock); 195 return; 196 } 197 } 198 } 199 } 200 201 /* 202 * look for slave instances matching with the slave id of the given master. 203 * when found, relink the open_link of slaves. 204 * 205 * call this with register_mutex down. 206 */ 207 static void snd_timer_check_master(struct snd_timer_instance *master) 208 { 209 struct snd_timer_instance *slave, *tmp; 210 211 /* check all pending slaves */ 212 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 213 if (slave->slave_class == master->slave_class && 214 slave->slave_id == master->slave_id) { 215 list_move_tail(&slave->open_list, &master->slave_list_head); 216 spin_lock_irq(&slave_active_lock); 217 spin_lock(&master->timer->lock); 218 slave->master = master; 219 slave->timer = master->timer; 220 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 221 list_add_tail(&slave->active_list, 222 &master->slave_active_head); 223 spin_unlock(&master->timer->lock); 224 spin_unlock_irq(&slave_active_lock); 225 } 226 } 227 } 228 229 /* 230 * open a timer instance 231 * when opening a master, the slave id must be here given. 232 */ 233 int snd_timer_open(struct snd_timer_instance **ti, 234 char *owner, struct snd_timer_id *tid, 235 unsigned int slave_id) 236 { 237 struct snd_timer *timer; 238 struct snd_timer_instance *timeri = NULL; 239 240 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 241 /* open a slave instance */ 242 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 243 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 244 pr_debug("ALSA: timer: invalid slave class %i\n", 245 tid->dev_sclass); 246 return -EINVAL; 247 } 248 mutex_lock(®ister_mutex); 249 timeri = snd_timer_instance_new(owner, NULL); 250 if (!timeri) { 251 mutex_unlock(®ister_mutex); 252 return -ENOMEM; 253 } 254 timeri->slave_class = tid->dev_sclass; 255 timeri->slave_id = tid->device; 256 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 257 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 258 snd_timer_check_slave(timeri); 259 mutex_unlock(®ister_mutex); 260 *ti = timeri; 261 return 0; 262 } 263 264 /* open a master instance */ 265 mutex_lock(®ister_mutex); 266 timer = snd_timer_find(tid); 267 #ifdef CONFIG_MODULES 268 if (!timer) { 269 mutex_unlock(®ister_mutex); 270 snd_timer_request(tid); 271 mutex_lock(®ister_mutex); 272 timer = snd_timer_find(tid); 273 } 274 #endif 275 if (!timer) { 276 mutex_unlock(®ister_mutex); 277 return -ENODEV; 278 } 279 if (!list_empty(&timer->open_list_head)) { 280 timeri = list_entry(timer->open_list_head.next, 281 struct snd_timer_instance, open_list); 282 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 283 mutex_unlock(®ister_mutex); 284 return -EBUSY; 285 } 286 } 287 timeri = snd_timer_instance_new(owner, timer); 288 if (!timeri) { 289 mutex_unlock(®ister_mutex); 290 return -ENOMEM; 291 } 292 /* take a card refcount for safe disconnection */ 293 if (timer->card) 294 get_device(&timer->card->card_dev); 295 timeri->slave_class = tid->dev_sclass; 296 timeri->slave_id = slave_id; 297 if (list_empty(&timer->open_list_head) && timer->hw.open) 298 timer->hw.open(timer); 299 list_add_tail(&timeri->open_list, &timer->open_list_head); 300 snd_timer_check_master(timeri); 301 mutex_unlock(®ister_mutex); 302 *ti = timeri; 303 return 0; 304 } 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 mutex_lock(®ister_mutex); 318 list_del(&timeri->open_list); 319 320 /* force to stop the timer */ 321 snd_timer_stop(timeri); 322 323 timer = timeri->timer; 324 if (timer) { 325 /* wait, until the active callback is finished */ 326 spin_lock_irq(&timer->lock); 327 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 328 spin_unlock_irq(&timer->lock); 329 udelay(10); 330 spin_lock_irq(&timer->lock); 331 } 332 spin_unlock_irq(&timer->lock); 333 334 /* remove slave links */ 335 spin_lock_irq(&slave_active_lock); 336 spin_lock(&timer->lock); 337 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 338 open_list) { 339 list_move_tail(&slave->open_list, &snd_timer_slave_list); 340 slave->master = NULL; 341 slave->timer = NULL; 342 list_del_init(&slave->ack_list); 343 list_del_init(&slave->active_list); 344 } 345 spin_unlock(&timer->lock); 346 spin_unlock_irq(&slave_active_lock); 347 348 /* slave doesn't need to release timer resources below */ 349 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 350 timer = NULL; 351 } 352 353 if (timeri->private_free) 354 timeri->private_free(timeri); 355 kfree(timeri->owner); 356 kfree(timeri); 357 358 if (timer) { 359 if (list_empty(&timer->open_list_head) && timer->hw.close) 360 timer->hw.close(timer); 361 /* release a card refcount for safe disconnection */ 362 if (timer->card) 363 put_device(&timer->card->card_dev); 364 module_put(timer->module); 365 } 366 367 mutex_unlock(®ister_mutex); 368 return 0; 369 } 370 371 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 372 { 373 struct snd_timer * timer; 374 375 if (timeri == NULL) 376 return 0; 377 if ((timer = timeri->timer) != NULL) { 378 if (timer->hw.c_resolution) 379 return timer->hw.c_resolution(timer); 380 return timer->hw.resolution; 381 } 382 return 0; 383 } 384 385 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 386 { 387 struct snd_timer *timer; 388 unsigned long resolution = 0; 389 struct snd_timer_instance *ts; 390 struct timespec tstamp; 391 392 if (timer_tstamp_monotonic) 393 ktime_get_ts(&tstamp); 394 else 395 getnstimeofday(&tstamp); 396 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 397 event > SNDRV_TIMER_EVENT_PAUSE)) 398 return; 399 if (event == SNDRV_TIMER_EVENT_START || 400 event == SNDRV_TIMER_EVENT_CONTINUE) 401 resolution = snd_timer_resolution(ti); 402 if (ti->ccallback) 403 ti->ccallback(ti, event, &tstamp, resolution); 404 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 405 return; 406 timer = ti->timer; 407 if (timer == NULL) 408 return; 409 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 410 return; 411 list_for_each_entry(ts, &ti->slave_active_head, active_list) 412 if (ts->ccallback) 413 ts->ccallback(ts, event + 100, &tstamp, resolution); 414 } 415 416 /* start/continue a master timer */ 417 static int snd_timer_start1(struct snd_timer_instance *timeri, 418 bool start, unsigned long ticks) 419 { 420 struct snd_timer *timer; 421 int result; 422 unsigned long flags; 423 424 timer = timeri->timer; 425 if (!timer) 426 return -EINVAL; 427 428 spin_lock_irqsave(&timer->lock, flags); 429 if (timer->card && timer->card->shutdown) { 430 result = -ENODEV; 431 goto unlock; 432 } 433 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 434 SNDRV_TIMER_IFLG_START)) { 435 result = -EBUSY; 436 goto unlock; 437 } 438 439 if (start) 440 timeri->ticks = timeri->cticks = ticks; 441 else if (!timeri->cticks) 442 timeri->cticks = 1; 443 timeri->pticks = 0; 444 445 list_move_tail(&timeri->active_list, &timer->active_list_head); 446 if (timer->running) { 447 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 448 goto __start_now; 449 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 450 timeri->flags |= SNDRV_TIMER_IFLG_START; 451 result = 1; /* delayed start */ 452 } else { 453 if (start) 454 timer->sticks = ticks; 455 timer->hw.start(timer); 456 __start_now: 457 timer->running++; 458 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 459 result = 0; 460 } 461 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 462 SNDRV_TIMER_EVENT_CONTINUE); 463 unlock: 464 spin_unlock_irqrestore(&timer->lock, flags); 465 return result; 466 } 467 468 /* start/continue a slave timer */ 469 static int snd_timer_start_slave(struct snd_timer_instance *timeri, 470 bool start) 471 { 472 unsigned long flags; 473 474 spin_lock_irqsave(&slave_active_lock, flags); 475 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 476 spin_unlock_irqrestore(&slave_active_lock, flags); 477 return -EBUSY; 478 } 479 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 480 if (timeri->master && timeri->timer) { 481 spin_lock(&timeri->timer->lock); 482 list_add_tail(&timeri->active_list, 483 &timeri->master->slave_active_head); 484 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 485 SNDRV_TIMER_EVENT_CONTINUE); 486 spin_unlock(&timeri->timer->lock); 487 } 488 spin_unlock_irqrestore(&slave_active_lock, flags); 489 return 1; /* delayed start */ 490 } 491 492 /* stop/pause a master timer */ 493 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) 494 { 495 struct snd_timer *timer; 496 int result = 0; 497 unsigned long flags; 498 499 timer = timeri->timer; 500 if (!timer) 501 return -EINVAL; 502 spin_lock_irqsave(&timer->lock, flags); 503 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 504 SNDRV_TIMER_IFLG_START))) { 505 result = -EBUSY; 506 goto unlock; 507 } 508 list_del_init(&timeri->ack_list); 509 list_del_init(&timeri->active_list); 510 if (timer->card && timer->card->shutdown) 511 goto unlock; 512 if (stop) { 513 timeri->cticks = timeri->ticks; 514 timeri->pticks = 0; 515 } 516 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 517 !(--timer->running)) { 518 timer->hw.stop(timer); 519 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 520 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 521 snd_timer_reschedule(timer, 0); 522 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 523 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 524 timer->hw.start(timer); 525 } 526 } 527 } 528 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 529 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 530 SNDRV_TIMER_EVENT_CONTINUE); 531 unlock: 532 spin_unlock_irqrestore(&timer->lock, flags); 533 return result; 534 } 535 536 /* stop/pause a slave timer */ 537 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) 538 { 539 unsigned long flags; 540 541 spin_lock_irqsave(&slave_active_lock, flags); 542 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) { 543 spin_unlock_irqrestore(&slave_active_lock, flags); 544 return -EBUSY; 545 } 546 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 547 if (timeri->timer) { 548 spin_lock(&timeri->timer->lock); 549 list_del_init(&timeri->ack_list); 550 list_del_init(&timeri->active_list); 551 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 552 SNDRV_TIMER_EVENT_CONTINUE); 553 spin_unlock(&timeri->timer->lock); 554 } 555 spin_unlock_irqrestore(&slave_active_lock, flags); 556 return 0; 557 } 558 559 /* 560 * start the timer instance 561 */ 562 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 563 { 564 if (timeri == NULL || ticks < 1) 565 return -EINVAL; 566 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 567 return snd_timer_start_slave(timeri, true); 568 else 569 return snd_timer_start1(timeri, true, ticks); 570 } 571 572 /* 573 * stop the timer instance. 574 * 575 * do not call this from the timer callback! 576 */ 577 int snd_timer_stop(struct snd_timer_instance *timeri) 578 { 579 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 580 return snd_timer_stop_slave(timeri, true); 581 else 582 return snd_timer_stop1(timeri, true); 583 } 584 585 /* 586 * start again.. the tick is kept. 587 */ 588 int snd_timer_continue(struct snd_timer_instance *timeri) 589 { 590 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 591 return snd_timer_start_slave(timeri, false); 592 else 593 return snd_timer_start1(timeri, false, 0); 594 } 595 596 /* 597 * pause.. remember the ticks left 598 */ 599 int snd_timer_pause(struct snd_timer_instance * timeri) 600 { 601 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 602 return snd_timer_stop_slave(timeri, false); 603 else 604 return snd_timer_stop1(timeri, false); 605 } 606 607 /* 608 * reschedule the timer 609 * 610 * start pending instances and check the scheduling ticks. 611 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 612 */ 613 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 614 { 615 struct snd_timer_instance *ti; 616 unsigned long ticks = ~0UL; 617 618 list_for_each_entry(ti, &timer->active_list_head, active_list) { 619 if (ti->flags & SNDRV_TIMER_IFLG_START) { 620 ti->flags &= ~SNDRV_TIMER_IFLG_START; 621 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 622 timer->running++; 623 } 624 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 625 if (ticks > ti->cticks) 626 ticks = ti->cticks; 627 } 628 } 629 if (ticks == ~0UL) { 630 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 631 return; 632 } 633 if (ticks > timer->hw.ticks) 634 ticks = timer->hw.ticks; 635 if (ticks_left != ticks) 636 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 637 timer->sticks = ticks; 638 } 639 640 /* 641 * timer tasklet 642 * 643 */ 644 static void snd_timer_tasklet(unsigned long arg) 645 { 646 struct snd_timer *timer = (struct snd_timer *) arg; 647 struct snd_timer_instance *ti; 648 struct list_head *p; 649 unsigned long resolution, ticks; 650 unsigned long flags; 651 652 if (timer->card && timer->card->shutdown) 653 return; 654 655 spin_lock_irqsave(&timer->lock, flags); 656 /* now process all callbacks */ 657 while (!list_empty(&timer->sack_list_head)) { 658 p = timer->sack_list_head.next; /* get first item */ 659 ti = list_entry(p, struct snd_timer_instance, ack_list); 660 661 /* remove from ack_list and make empty */ 662 list_del_init(p); 663 664 ticks = ti->pticks; 665 ti->pticks = 0; 666 resolution = ti->resolution; 667 668 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 669 spin_unlock(&timer->lock); 670 if (ti->callback) 671 ti->callback(ti, resolution, ticks); 672 spin_lock(&timer->lock); 673 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 674 } 675 spin_unlock_irqrestore(&timer->lock, flags); 676 } 677 678 /* 679 * timer interrupt 680 * 681 * ticks_left is usually equal to timer->sticks. 682 * 683 */ 684 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 685 { 686 struct snd_timer_instance *ti, *ts, *tmp; 687 unsigned long resolution, ticks; 688 struct list_head *p, *ack_list_head; 689 unsigned long flags; 690 int use_tasklet = 0; 691 692 if (timer == NULL) 693 return; 694 695 if (timer->card && timer->card->shutdown) 696 return; 697 698 spin_lock_irqsave(&timer->lock, flags); 699 700 /* remember the current resolution */ 701 if (timer->hw.c_resolution) 702 resolution = timer->hw.c_resolution(timer); 703 else 704 resolution = timer->hw.resolution; 705 706 /* loop for all active instances 707 * Here we cannot use list_for_each_entry because the active_list of a 708 * processed instance is relinked to done_list_head before the callback 709 * is called. 710 */ 711 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 712 active_list) { 713 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 714 continue; 715 ti->pticks += ticks_left; 716 ti->resolution = resolution; 717 if (ti->cticks < ticks_left) 718 ti->cticks = 0; 719 else 720 ti->cticks -= ticks_left; 721 if (ti->cticks) /* not expired */ 722 continue; 723 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 724 ti->cticks = ti->ticks; 725 } else { 726 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 727 --timer->running; 728 list_del_init(&ti->active_list); 729 } 730 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 731 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 732 ack_list_head = &timer->ack_list_head; 733 else 734 ack_list_head = &timer->sack_list_head; 735 if (list_empty(&ti->ack_list)) 736 list_add_tail(&ti->ack_list, ack_list_head); 737 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 738 ts->pticks = ti->pticks; 739 ts->resolution = resolution; 740 if (list_empty(&ts->ack_list)) 741 list_add_tail(&ts->ack_list, ack_list_head); 742 } 743 } 744 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 745 snd_timer_reschedule(timer, timer->sticks); 746 if (timer->running) { 747 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 748 timer->hw.stop(timer); 749 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 750 } 751 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 752 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 753 /* restart timer */ 754 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 755 timer->hw.start(timer); 756 } 757 } else { 758 timer->hw.stop(timer); 759 } 760 761 /* now process all fast callbacks */ 762 while (!list_empty(&timer->ack_list_head)) { 763 p = timer->ack_list_head.next; /* get first item */ 764 ti = list_entry(p, struct snd_timer_instance, ack_list); 765 766 /* remove from ack_list and make empty */ 767 list_del_init(p); 768 769 ticks = ti->pticks; 770 ti->pticks = 0; 771 772 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 773 spin_unlock(&timer->lock); 774 if (ti->callback) 775 ti->callback(ti, resolution, ticks); 776 spin_lock(&timer->lock); 777 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 778 } 779 780 /* do we have any slow callbacks? */ 781 use_tasklet = !list_empty(&timer->sack_list_head); 782 spin_unlock_irqrestore(&timer->lock, flags); 783 784 if (use_tasklet) 785 tasklet_schedule(&timer->task_queue); 786 } 787 788 /* 789 790 */ 791 792 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 793 struct snd_timer **rtimer) 794 { 795 struct snd_timer *timer; 796 int err; 797 static struct snd_device_ops ops = { 798 .dev_free = snd_timer_dev_free, 799 .dev_register = snd_timer_dev_register, 800 .dev_disconnect = snd_timer_dev_disconnect, 801 }; 802 803 if (snd_BUG_ON(!tid)) 804 return -EINVAL; 805 if (rtimer) 806 *rtimer = NULL; 807 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 808 if (!timer) 809 return -ENOMEM; 810 timer->tmr_class = tid->dev_class; 811 timer->card = card; 812 timer->tmr_device = tid->device; 813 timer->tmr_subdevice = tid->subdevice; 814 if (id) 815 strlcpy(timer->id, id, sizeof(timer->id)); 816 INIT_LIST_HEAD(&timer->device_list); 817 INIT_LIST_HEAD(&timer->open_list_head); 818 INIT_LIST_HEAD(&timer->active_list_head); 819 INIT_LIST_HEAD(&timer->ack_list_head); 820 INIT_LIST_HEAD(&timer->sack_list_head); 821 spin_lock_init(&timer->lock); 822 tasklet_init(&timer->task_queue, snd_timer_tasklet, 823 (unsigned long)timer); 824 if (card != NULL) { 825 timer->module = card->module; 826 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 827 if (err < 0) { 828 snd_timer_free(timer); 829 return err; 830 } 831 } 832 if (rtimer) 833 *rtimer = timer; 834 return 0; 835 } 836 837 static int snd_timer_free(struct snd_timer *timer) 838 { 839 if (!timer) 840 return 0; 841 842 mutex_lock(®ister_mutex); 843 if (! list_empty(&timer->open_list_head)) { 844 struct list_head *p, *n; 845 struct snd_timer_instance *ti; 846 pr_warn("ALSA: timer %p is busy?\n", timer); 847 list_for_each_safe(p, n, &timer->open_list_head) { 848 list_del_init(p); 849 ti = list_entry(p, struct snd_timer_instance, open_list); 850 ti->timer = NULL; 851 } 852 } 853 list_del(&timer->device_list); 854 mutex_unlock(®ister_mutex); 855 856 if (timer->private_free) 857 timer->private_free(timer); 858 kfree(timer); 859 return 0; 860 } 861 862 static int snd_timer_dev_free(struct snd_device *device) 863 { 864 struct snd_timer *timer = device->device_data; 865 return snd_timer_free(timer); 866 } 867 868 static int snd_timer_dev_register(struct snd_device *dev) 869 { 870 struct snd_timer *timer = dev->device_data; 871 struct snd_timer *timer1; 872 873 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 874 return -ENXIO; 875 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 876 !timer->hw.resolution && timer->hw.c_resolution == NULL) 877 return -EINVAL; 878 879 mutex_lock(®ister_mutex); 880 list_for_each_entry(timer1, &snd_timer_list, device_list) { 881 if (timer1->tmr_class > timer->tmr_class) 882 break; 883 if (timer1->tmr_class < timer->tmr_class) 884 continue; 885 if (timer1->card && timer->card) { 886 if (timer1->card->number > timer->card->number) 887 break; 888 if (timer1->card->number < timer->card->number) 889 continue; 890 } 891 if (timer1->tmr_device > timer->tmr_device) 892 break; 893 if (timer1->tmr_device < timer->tmr_device) 894 continue; 895 if (timer1->tmr_subdevice > timer->tmr_subdevice) 896 break; 897 if (timer1->tmr_subdevice < timer->tmr_subdevice) 898 continue; 899 /* conflicts.. */ 900 mutex_unlock(®ister_mutex); 901 return -EBUSY; 902 } 903 list_add_tail(&timer->device_list, &timer1->device_list); 904 mutex_unlock(®ister_mutex); 905 return 0; 906 } 907 908 static int snd_timer_dev_disconnect(struct snd_device *device) 909 { 910 struct snd_timer *timer = device->device_data; 911 struct snd_timer_instance *ti; 912 913 mutex_lock(®ister_mutex); 914 list_del_init(&timer->device_list); 915 /* wake up pending sleepers */ 916 list_for_each_entry(ti, &timer->open_list_head, open_list) { 917 if (ti->disconnect) 918 ti->disconnect(ti); 919 } 920 mutex_unlock(®ister_mutex); 921 return 0; 922 } 923 924 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 925 { 926 unsigned long flags; 927 unsigned long resolution = 0; 928 struct snd_timer_instance *ti, *ts; 929 930 if (timer->card && timer->card->shutdown) 931 return; 932 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 933 return; 934 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 935 event > SNDRV_TIMER_EVENT_MRESUME)) 936 return; 937 spin_lock_irqsave(&timer->lock, flags); 938 if (event == SNDRV_TIMER_EVENT_MSTART || 939 event == SNDRV_TIMER_EVENT_MCONTINUE || 940 event == SNDRV_TIMER_EVENT_MRESUME) { 941 if (timer->hw.c_resolution) 942 resolution = timer->hw.c_resolution(timer); 943 else 944 resolution = timer->hw.resolution; 945 } 946 list_for_each_entry(ti, &timer->active_list_head, active_list) { 947 if (ti->ccallback) 948 ti->ccallback(ti, event, tstamp, resolution); 949 list_for_each_entry(ts, &ti->slave_active_head, active_list) 950 if (ts->ccallback) 951 ts->ccallback(ts, event, tstamp, resolution); 952 } 953 spin_unlock_irqrestore(&timer->lock, flags); 954 } 955 956 /* 957 * exported functions for global timers 958 */ 959 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 960 { 961 struct snd_timer_id tid; 962 963 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 964 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 965 tid.card = -1; 966 tid.device = device; 967 tid.subdevice = 0; 968 return snd_timer_new(NULL, id, &tid, rtimer); 969 } 970 971 int snd_timer_global_free(struct snd_timer *timer) 972 { 973 return snd_timer_free(timer); 974 } 975 976 int snd_timer_global_register(struct snd_timer *timer) 977 { 978 struct snd_device dev; 979 980 memset(&dev, 0, sizeof(dev)); 981 dev.device_data = timer; 982 return snd_timer_dev_register(&dev); 983 } 984 985 /* 986 * System timer 987 */ 988 989 struct snd_timer_system_private { 990 struct timer_list tlist; 991 unsigned long last_expires; 992 unsigned long last_jiffies; 993 unsigned long correction; 994 }; 995 996 static void snd_timer_s_function(unsigned long data) 997 { 998 struct snd_timer *timer = (struct snd_timer *)data; 999 struct snd_timer_system_private *priv = timer->private_data; 1000 unsigned long jiff = jiffies; 1001 if (time_after(jiff, priv->last_expires)) 1002 priv->correction += (long)jiff - (long)priv->last_expires; 1003 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1004 } 1005 1006 static int snd_timer_s_start(struct snd_timer * timer) 1007 { 1008 struct snd_timer_system_private *priv; 1009 unsigned long njiff; 1010 1011 priv = (struct snd_timer_system_private *) timer->private_data; 1012 njiff = (priv->last_jiffies = jiffies); 1013 if (priv->correction > timer->sticks - 1) { 1014 priv->correction -= timer->sticks - 1; 1015 njiff++; 1016 } else { 1017 njiff += timer->sticks - priv->correction; 1018 priv->correction = 0; 1019 } 1020 priv->last_expires = njiff; 1021 mod_timer(&priv->tlist, njiff); 1022 return 0; 1023 } 1024 1025 static int snd_timer_s_stop(struct snd_timer * timer) 1026 { 1027 struct snd_timer_system_private *priv; 1028 unsigned long jiff; 1029 1030 priv = (struct snd_timer_system_private *) timer->private_data; 1031 del_timer(&priv->tlist); 1032 jiff = jiffies; 1033 if (time_before(jiff, priv->last_expires)) 1034 timer->sticks = priv->last_expires - jiff; 1035 else 1036 timer->sticks = 1; 1037 priv->correction = 0; 1038 return 0; 1039 } 1040 1041 static int snd_timer_s_close(struct snd_timer *timer) 1042 { 1043 struct snd_timer_system_private *priv; 1044 1045 priv = (struct snd_timer_system_private *)timer->private_data; 1046 del_timer_sync(&priv->tlist); 1047 return 0; 1048 } 1049 1050 static struct snd_timer_hardware snd_timer_system = 1051 { 1052 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1053 .resolution = 1000000000L / HZ, 1054 .ticks = 10000000L, 1055 .close = snd_timer_s_close, 1056 .start = snd_timer_s_start, 1057 .stop = snd_timer_s_stop 1058 }; 1059 1060 static void snd_timer_free_system(struct snd_timer *timer) 1061 { 1062 kfree(timer->private_data); 1063 } 1064 1065 static int snd_timer_register_system(void) 1066 { 1067 struct snd_timer *timer; 1068 struct snd_timer_system_private *priv; 1069 int err; 1070 1071 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1072 if (err < 0) 1073 return err; 1074 strcpy(timer->name, "system timer"); 1075 timer->hw = snd_timer_system; 1076 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1077 if (priv == NULL) { 1078 snd_timer_free(timer); 1079 return -ENOMEM; 1080 } 1081 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1082 timer->private_data = priv; 1083 timer->private_free = snd_timer_free_system; 1084 return snd_timer_global_register(timer); 1085 } 1086 1087 #ifdef CONFIG_SND_PROC_FS 1088 /* 1089 * Info interface 1090 */ 1091 1092 static void snd_timer_proc_read(struct snd_info_entry *entry, 1093 struct snd_info_buffer *buffer) 1094 { 1095 struct snd_timer *timer; 1096 struct snd_timer_instance *ti; 1097 1098 mutex_lock(®ister_mutex); 1099 list_for_each_entry(timer, &snd_timer_list, device_list) { 1100 if (timer->card && timer->card->shutdown) 1101 continue; 1102 switch (timer->tmr_class) { 1103 case SNDRV_TIMER_CLASS_GLOBAL: 1104 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1105 break; 1106 case SNDRV_TIMER_CLASS_CARD: 1107 snd_iprintf(buffer, "C%i-%i: ", 1108 timer->card->number, timer->tmr_device); 1109 break; 1110 case SNDRV_TIMER_CLASS_PCM: 1111 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1112 timer->tmr_device, timer->tmr_subdevice); 1113 break; 1114 default: 1115 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1116 timer->card ? timer->card->number : -1, 1117 timer->tmr_device, timer->tmr_subdevice); 1118 } 1119 snd_iprintf(buffer, "%s :", timer->name); 1120 if (timer->hw.resolution) 1121 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1122 timer->hw.resolution / 1000, 1123 timer->hw.resolution % 1000, 1124 timer->hw.ticks); 1125 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1126 snd_iprintf(buffer, " SLAVE"); 1127 snd_iprintf(buffer, "\n"); 1128 list_for_each_entry(ti, &timer->open_list_head, open_list) 1129 snd_iprintf(buffer, " Client %s : %s\n", 1130 ti->owner ? ti->owner : "unknown", 1131 ti->flags & (SNDRV_TIMER_IFLG_START | 1132 SNDRV_TIMER_IFLG_RUNNING) 1133 ? "running" : "stopped"); 1134 } 1135 mutex_unlock(®ister_mutex); 1136 } 1137 1138 static struct snd_info_entry *snd_timer_proc_entry; 1139 1140 static void __init snd_timer_proc_init(void) 1141 { 1142 struct snd_info_entry *entry; 1143 1144 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1145 if (entry != NULL) { 1146 entry->c.text.read = snd_timer_proc_read; 1147 if (snd_info_register(entry) < 0) { 1148 snd_info_free_entry(entry); 1149 entry = NULL; 1150 } 1151 } 1152 snd_timer_proc_entry = entry; 1153 } 1154 1155 static void __exit snd_timer_proc_done(void) 1156 { 1157 snd_info_free_entry(snd_timer_proc_entry); 1158 } 1159 #else /* !CONFIG_SND_PROC_FS */ 1160 #define snd_timer_proc_init() 1161 #define snd_timer_proc_done() 1162 #endif 1163 1164 /* 1165 * USER SPACE interface 1166 */ 1167 1168 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1169 unsigned long resolution, 1170 unsigned long ticks) 1171 { 1172 struct snd_timer_user *tu = timeri->callback_data; 1173 struct snd_timer_read *r; 1174 int prev; 1175 1176 spin_lock(&tu->qlock); 1177 if (tu->qused > 0) { 1178 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1179 r = &tu->queue[prev]; 1180 if (r->resolution == resolution) { 1181 r->ticks += ticks; 1182 goto __wake; 1183 } 1184 } 1185 if (tu->qused >= tu->queue_size) { 1186 tu->overrun++; 1187 } else { 1188 r = &tu->queue[tu->qtail++]; 1189 tu->qtail %= tu->queue_size; 1190 r->resolution = resolution; 1191 r->ticks = ticks; 1192 tu->qused++; 1193 } 1194 __wake: 1195 spin_unlock(&tu->qlock); 1196 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1197 wake_up(&tu->qchange_sleep); 1198 } 1199 1200 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1201 struct snd_timer_tread *tread) 1202 { 1203 if (tu->qused >= tu->queue_size) { 1204 tu->overrun++; 1205 } else { 1206 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1207 tu->qtail %= tu->queue_size; 1208 tu->qused++; 1209 } 1210 } 1211 1212 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1213 int event, 1214 struct timespec *tstamp, 1215 unsigned long resolution) 1216 { 1217 struct snd_timer_user *tu = timeri->callback_data; 1218 struct snd_timer_tread r1; 1219 unsigned long flags; 1220 1221 if (event >= SNDRV_TIMER_EVENT_START && 1222 event <= SNDRV_TIMER_EVENT_PAUSE) 1223 tu->tstamp = *tstamp; 1224 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1225 return; 1226 memset(&r1, 0, sizeof(r1)); 1227 r1.event = event; 1228 r1.tstamp = *tstamp; 1229 r1.val = resolution; 1230 spin_lock_irqsave(&tu->qlock, flags); 1231 snd_timer_user_append_to_tqueue(tu, &r1); 1232 spin_unlock_irqrestore(&tu->qlock, flags); 1233 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1234 wake_up(&tu->qchange_sleep); 1235 } 1236 1237 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1238 { 1239 struct snd_timer_user *tu = timeri->callback_data; 1240 1241 tu->disconnected = true; 1242 wake_up(&tu->qchange_sleep); 1243 } 1244 1245 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1246 unsigned long resolution, 1247 unsigned long ticks) 1248 { 1249 struct snd_timer_user *tu = timeri->callback_data; 1250 struct snd_timer_tread *r, r1; 1251 struct timespec tstamp; 1252 int prev, append = 0; 1253 1254 memset(&tstamp, 0, sizeof(tstamp)); 1255 spin_lock(&tu->qlock); 1256 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1257 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1258 spin_unlock(&tu->qlock); 1259 return; 1260 } 1261 if (tu->last_resolution != resolution || ticks > 0) { 1262 if (timer_tstamp_monotonic) 1263 ktime_get_ts(&tstamp); 1264 else 1265 getnstimeofday(&tstamp); 1266 } 1267 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1268 tu->last_resolution != resolution) { 1269 memset(&r1, 0, sizeof(r1)); 1270 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1271 r1.tstamp = tstamp; 1272 r1.val = resolution; 1273 snd_timer_user_append_to_tqueue(tu, &r1); 1274 tu->last_resolution = resolution; 1275 append++; 1276 } 1277 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1278 goto __wake; 1279 if (ticks == 0) 1280 goto __wake; 1281 if (tu->qused > 0) { 1282 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1283 r = &tu->tqueue[prev]; 1284 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1285 r->tstamp = tstamp; 1286 r->val += ticks; 1287 append++; 1288 goto __wake; 1289 } 1290 } 1291 r1.event = SNDRV_TIMER_EVENT_TICK; 1292 r1.tstamp = tstamp; 1293 r1.val = ticks; 1294 snd_timer_user_append_to_tqueue(tu, &r1); 1295 append++; 1296 __wake: 1297 spin_unlock(&tu->qlock); 1298 if (append == 0) 1299 return; 1300 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1301 wake_up(&tu->qchange_sleep); 1302 } 1303 1304 static int snd_timer_user_open(struct inode *inode, struct file *file) 1305 { 1306 struct snd_timer_user *tu; 1307 int err; 1308 1309 err = nonseekable_open(inode, file); 1310 if (err < 0) 1311 return err; 1312 1313 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1314 if (tu == NULL) 1315 return -ENOMEM; 1316 spin_lock_init(&tu->qlock); 1317 init_waitqueue_head(&tu->qchange_sleep); 1318 mutex_init(&tu->ioctl_lock); 1319 tu->ticks = 1; 1320 tu->queue_size = 128; 1321 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1322 GFP_KERNEL); 1323 if (tu->queue == NULL) { 1324 kfree(tu); 1325 return -ENOMEM; 1326 } 1327 file->private_data = tu; 1328 return 0; 1329 } 1330 1331 static int snd_timer_user_release(struct inode *inode, struct file *file) 1332 { 1333 struct snd_timer_user *tu; 1334 1335 if (file->private_data) { 1336 tu = file->private_data; 1337 file->private_data = NULL; 1338 mutex_lock(&tu->ioctl_lock); 1339 if (tu->timeri) 1340 snd_timer_close(tu->timeri); 1341 mutex_unlock(&tu->ioctl_lock); 1342 kfree(tu->queue); 1343 kfree(tu->tqueue); 1344 kfree(tu); 1345 } 1346 return 0; 1347 } 1348 1349 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1350 { 1351 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1352 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1353 id->card = -1; 1354 id->device = -1; 1355 id->subdevice = -1; 1356 } 1357 1358 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1359 { 1360 id->dev_class = timer->tmr_class; 1361 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1362 id->card = timer->card ? timer->card->number : -1; 1363 id->device = timer->tmr_device; 1364 id->subdevice = timer->tmr_subdevice; 1365 } 1366 1367 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1368 { 1369 struct snd_timer_id id; 1370 struct snd_timer *timer; 1371 struct list_head *p; 1372 1373 if (copy_from_user(&id, _tid, sizeof(id))) 1374 return -EFAULT; 1375 mutex_lock(®ister_mutex); 1376 if (id.dev_class < 0) { /* first item */ 1377 if (list_empty(&snd_timer_list)) 1378 snd_timer_user_zero_id(&id); 1379 else { 1380 timer = list_entry(snd_timer_list.next, 1381 struct snd_timer, device_list); 1382 snd_timer_user_copy_id(&id, timer); 1383 } 1384 } else { 1385 switch (id.dev_class) { 1386 case SNDRV_TIMER_CLASS_GLOBAL: 1387 id.device = id.device < 0 ? 0 : id.device + 1; 1388 list_for_each(p, &snd_timer_list) { 1389 timer = list_entry(p, struct snd_timer, device_list); 1390 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1391 snd_timer_user_copy_id(&id, timer); 1392 break; 1393 } 1394 if (timer->tmr_device >= id.device) { 1395 snd_timer_user_copy_id(&id, timer); 1396 break; 1397 } 1398 } 1399 if (p == &snd_timer_list) 1400 snd_timer_user_zero_id(&id); 1401 break; 1402 case SNDRV_TIMER_CLASS_CARD: 1403 case SNDRV_TIMER_CLASS_PCM: 1404 if (id.card < 0) { 1405 id.card = 0; 1406 } else { 1407 if (id.card < 0) { 1408 id.card = 0; 1409 } else { 1410 if (id.device < 0) { 1411 id.device = 0; 1412 } else { 1413 if (id.subdevice < 0) { 1414 id.subdevice = 0; 1415 } else { 1416 id.subdevice++; 1417 } 1418 } 1419 } 1420 } 1421 list_for_each(p, &snd_timer_list) { 1422 timer = list_entry(p, struct snd_timer, device_list); 1423 if (timer->tmr_class > id.dev_class) { 1424 snd_timer_user_copy_id(&id, timer); 1425 break; 1426 } 1427 if (timer->tmr_class < id.dev_class) 1428 continue; 1429 if (timer->card->number > id.card) { 1430 snd_timer_user_copy_id(&id, timer); 1431 break; 1432 } 1433 if (timer->card->number < id.card) 1434 continue; 1435 if (timer->tmr_device > id.device) { 1436 snd_timer_user_copy_id(&id, timer); 1437 break; 1438 } 1439 if (timer->tmr_device < id.device) 1440 continue; 1441 if (timer->tmr_subdevice > id.subdevice) { 1442 snd_timer_user_copy_id(&id, timer); 1443 break; 1444 } 1445 if (timer->tmr_subdevice < id.subdevice) 1446 continue; 1447 snd_timer_user_copy_id(&id, timer); 1448 break; 1449 } 1450 if (p == &snd_timer_list) 1451 snd_timer_user_zero_id(&id); 1452 break; 1453 default: 1454 snd_timer_user_zero_id(&id); 1455 } 1456 } 1457 mutex_unlock(®ister_mutex); 1458 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1459 return -EFAULT; 1460 return 0; 1461 } 1462 1463 static int snd_timer_user_ginfo(struct file *file, 1464 struct snd_timer_ginfo __user *_ginfo) 1465 { 1466 struct snd_timer_ginfo *ginfo; 1467 struct snd_timer_id tid; 1468 struct snd_timer *t; 1469 struct list_head *p; 1470 int err = 0; 1471 1472 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1473 if (IS_ERR(ginfo)) 1474 return PTR_ERR(ginfo); 1475 1476 tid = ginfo->tid; 1477 memset(ginfo, 0, sizeof(*ginfo)); 1478 ginfo->tid = tid; 1479 mutex_lock(®ister_mutex); 1480 t = snd_timer_find(&tid); 1481 if (t != NULL) { 1482 ginfo->card = t->card ? t->card->number : -1; 1483 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1484 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1485 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1486 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1487 ginfo->resolution = t->hw.resolution; 1488 if (t->hw.resolution_min > 0) { 1489 ginfo->resolution_min = t->hw.resolution_min; 1490 ginfo->resolution_max = t->hw.resolution_max; 1491 } 1492 list_for_each(p, &t->open_list_head) { 1493 ginfo->clients++; 1494 } 1495 } else { 1496 err = -ENODEV; 1497 } 1498 mutex_unlock(®ister_mutex); 1499 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1500 err = -EFAULT; 1501 kfree(ginfo); 1502 return err; 1503 } 1504 1505 static int timer_set_gparams(struct snd_timer_gparams *gparams) 1506 { 1507 struct snd_timer *t; 1508 int err; 1509 1510 mutex_lock(®ister_mutex); 1511 t = snd_timer_find(&gparams->tid); 1512 if (!t) { 1513 err = -ENODEV; 1514 goto _error; 1515 } 1516 if (!list_empty(&t->open_list_head)) { 1517 err = -EBUSY; 1518 goto _error; 1519 } 1520 if (!t->hw.set_period) { 1521 err = -ENOSYS; 1522 goto _error; 1523 } 1524 err = t->hw.set_period(t, gparams->period_num, gparams->period_den); 1525 _error: 1526 mutex_unlock(®ister_mutex); 1527 return err; 1528 } 1529 1530 static int snd_timer_user_gparams(struct file *file, 1531 struct snd_timer_gparams __user *_gparams) 1532 { 1533 struct snd_timer_gparams gparams; 1534 1535 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1536 return -EFAULT; 1537 return timer_set_gparams(&gparams); 1538 } 1539 1540 static int snd_timer_user_gstatus(struct file *file, 1541 struct snd_timer_gstatus __user *_gstatus) 1542 { 1543 struct snd_timer_gstatus gstatus; 1544 struct snd_timer_id tid; 1545 struct snd_timer *t; 1546 int err = 0; 1547 1548 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1549 return -EFAULT; 1550 tid = gstatus.tid; 1551 memset(&gstatus, 0, sizeof(gstatus)); 1552 gstatus.tid = tid; 1553 mutex_lock(®ister_mutex); 1554 t = snd_timer_find(&tid); 1555 if (t != NULL) { 1556 if (t->hw.c_resolution) 1557 gstatus.resolution = t->hw.c_resolution(t); 1558 else 1559 gstatus.resolution = t->hw.resolution; 1560 if (t->hw.precise_resolution) { 1561 t->hw.precise_resolution(t, &gstatus.resolution_num, 1562 &gstatus.resolution_den); 1563 } else { 1564 gstatus.resolution_num = gstatus.resolution; 1565 gstatus.resolution_den = 1000000000uL; 1566 } 1567 } else { 1568 err = -ENODEV; 1569 } 1570 mutex_unlock(®ister_mutex); 1571 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1572 err = -EFAULT; 1573 return err; 1574 } 1575 1576 static int snd_timer_user_tselect(struct file *file, 1577 struct snd_timer_select __user *_tselect) 1578 { 1579 struct snd_timer_user *tu; 1580 struct snd_timer_select tselect; 1581 char str[32]; 1582 int err = 0; 1583 1584 tu = file->private_data; 1585 if (tu->timeri) { 1586 snd_timer_close(tu->timeri); 1587 tu->timeri = NULL; 1588 } 1589 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1590 err = -EFAULT; 1591 goto __err; 1592 } 1593 sprintf(str, "application %i", current->pid); 1594 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1595 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1596 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1597 if (err < 0) 1598 goto __err; 1599 1600 kfree(tu->queue); 1601 tu->queue = NULL; 1602 kfree(tu->tqueue); 1603 tu->tqueue = NULL; 1604 if (tu->tread) { 1605 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1606 GFP_KERNEL); 1607 if (tu->tqueue == NULL) 1608 err = -ENOMEM; 1609 } else { 1610 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1611 GFP_KERNEL); 1612 if (tu->queue == NULL) 1613 err = -ENOMEM; 1614 } 1615 1616 if (err < 0) { 1617 snd_timer_close(tu->timeri); 1618 tu->timeri = NULL; 1619 } else { 1620 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1621 tu->timeri->callback = tu->tread 1622 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1623 tu->timeri->ccallback = snd_timer_user_ccallback; 1624 tu->timeri->callback_data = (void *)tu; 1625 tu->timeri->disconnect = snd_timer_user_disconnect; 1626 } 1627 1628 __err: 1629 return err; 1630 } 1631 1632 static int snd_timer_user_info(struct file *file, 1633 struct snd_timer_info __user *_info) 1634 { 1635 struct snd_timer_user *tu; 1636 struct snd_timer_info *info; 1637 struct snd_timer *t; 1638 int err = 0; 1639 1640 tu = file->private_data; 1641 if (!tu->timeri) 1642 return -EBADFD; 1643 t = tu->timeri->timer; 1644 if (!t) 1645 return -EBADFD; 1646 1647 info = kzalloc(sizeof(*info), GFP_KERNEL); 1648 if (! info) 1649 return -ENOMEM; 1650 info->card = t->card ? t->card->number : -1; 1651 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1652 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1653 strlcpy(info->id, t->id, sizeof(info->id)); 1654 strlcpy(info->name, t->name, sizeof(info->name)); 1655 info->resolution = t->hw.resolution; 1656 if (copy_to_user(_info, info, sizeof(*_info))) 1657 err = -EFAULT; 1658 kfree(info); 1659 return err; 1660 } 1661 1662 static int snd_timer_user_params(struct file *file, 1663 struct snd_timer_params __user *_params) 1664 { 1665 struct snd_timer_user *tu; 1666 struct snd_timer_params params; 1667 struct snd_timer *t; 1668 struct snd_timer_read *tr; 1669 struct snd_timer_tread *ttr; 1670 int err; 1671 1672 tu = file->private_data; 1673 if (!tu->timeri) 1674 return -EBADFD; 1675 t = tu->timeri->timer; 1676 if (!t) 1677 return -EBADFD; 1678 if (copy_from_user(¶ms, _params, sizeof(params))) 1679 return -EFAULT; 1680 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1681 err = -EINVAL; 1682 goto _end; 1683 } 1684 if (params.queue_size > 0 && 1685 (params.queue_size < 32 || params.queue_size > 1024)) { 1686 err = -EINVAL; 1687 goto _end; 1688 } 1689 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1690 (1<<SNDRV_TIMER_EVENT_TICK)| 1691 (1<<SNDRV_TIMER_EVENT_START)| 1692 (1<<SNDRV_TIMER_EVENT_STOP)| 1693 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1694 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1695 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1696 (1<<SNDRV_TIMER_EVENT_RESUME)| 1697 (1<<SNDRV_TIMER_EVENT_MSTART)| 1698 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1699 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1700 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1701 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1702 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1703 err = -EINVAL; 1704 goto _end; 1705 } 1706 snd_timer_stop(tu->timeri); 1707 spin_lock_irq(&t->lock); 1708 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1709 SNDRV_TIMER_IFLG_EXCLUSIVE| 1710 SNDRV_TIMER_IFLG_EARLY_EVENT); 1711 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1712 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1713 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1714 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1715 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1716 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1717 spin_unlock_irq(&t->lock); 1718 if (params.queue_size > 0 && 1719 (unsigned int)tu->queue_size != params.queue_size) { 1720 if (tu->tread) { 1721 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1722 GFP_KERNEL); 1723 if (ttr) { 1724 kfree(tu->tqueue); 1725 tu->queue_size = params.queue_size; 1726 tu->tqueue = ttr; 1727 } 1728 } else { 1729 tr = kmalloc(params.queue_size * sizeof(*tr), 1730 GFP_KERNEL); 1731 if (tr) { 1732 kfree(tu->queue); 1733 tu->queue_size = params.queue_size; 1734 tu->queue = tr; 1735 } 1736 } 1737 } 1738 tu->qhead = tu->qtail = tu->qused = 0; 1739 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1740 if (tu->tread) { 1741 struct snd_timer_tread tread; 1742 memset(&tread, 0, sizeof(tread)); 1743 tread.event = SNDRV_TIMER_EVENT_EARLY; 1744 tread.tstamp.tv_sec = 0; 1745 tread.tstamp.tv_nsec = 0; 1746 tread.val = 0; 1747 snd_timer_user_append_to_tqueue(tu, &tread); 1748 } else { 1749 struct snd_timer_read *r = &tu->queue[0]; 1750 r->resolution = 0; 1751 r->ticks = 0; 1752 tu->qused++; 1753 tu->qtail++; 1754 } 1755 } 1756 tu->filter = params.filter; 1757 tu->ticks = params.ticks; 1758 err = 0; 1759 _end: 1760 if (copy_to_user(_params, ¶ms, sizeof(params))) 1761 return -EFAULT; 1762 return err; 1763 } 1764 1765 static int snd_timer_user_status(struct file *file, 1766 struct snd_timer_status __user *_status) 1767 { 1768 struct snd_timer_user *tu; 1769 struct snd_timer_status status; 1770 1771 tu = file->private_data; 1772 if (!tu->timeri) 1773 return -EBADFD; 1774 memset(&status, 0, sizeof(status)); 1775 status.tstamp = tu->tstamp; 1776 status.resolution = snd_timer_resolution(tu->timeri); 1777 status.lost = tu->timeri->lost; 1778 status.overrun = tu->overrun; 1779 spin_lock_irq(&tu->qlock); 1780 status.queue = tu->qused; 1781 spin_unlock_irq(&tu->qlock); 1782 if (copy_to_user(_status, &status, sizeof(status))) 1783 return -EFAULT; 1784 return 0; 1785 } 1786 1787 static int snd_timer_user_start(struct file *file) 1788 { 1789 int err; 1790 struct snd_timer_user *tu; 1791 1792 tu = file->private_data; 1793 if (!tu->timeri) 1794 return -EBADFD; 1795 snd_timer_stop(tu->timeri); 1796 tu->timeri->lost = 0; 1797 tu->last_resolution = 0; 1798 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1799 } 1800 1801 static int snd_timer_user_stop(struct file *file) 1802 { 1803 int err; 1804 struct snd_timer_user *tu; 1805 1806 tu = file->private_data; 1807 if (!tu->timeri) 1808 return -EBADFD; 1809 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1810 } 1811 1812 static int snd_timer_user_continue(struct file *file) 1813 { 1814 int err; 1815 struct snd_timer_user *tu; 1816 1817 tu = file->private_data; 1818 if (!tu->timeri) 1819 return -EBADFD; 1820 tu->timeri->lost = 0; 1821 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1822 } 1823 1824 static int snd_timer_user_pause(struct file *file) 1825 { 1826 int err; 1827 struct snd_timer_user *tu; 1828 1829 tu = file->private_data; 1830 if (!tu->timeri) 1831 return -EBADFD; 1832 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1833 } 1834 1835 enum { 1836 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1837 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1838 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1839 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1840 }; 1841 1842 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1843 unsigned long arg) 1844 { 1845 struct snd_timer_user *tu; 1846 void __user *argp = (void __user *)arg; 1847 int __user *p = argp; 1848 1849 tu = file->private_data; 1850 switch (cmd) { 1851 case SNDRV_TIMER_IOCTL_PVERSION: 1852 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1853 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1854 return snd_timer_user_next_device(argp); 1855 case SNDRV_TIMER_IOCTL_TREAD: 1856 { 1857 int xarg; 1858 1859 if (tu->timeri) /* too late */ 1860 return -EBUSY; 1861 if (get_user(xarg, p)) 1862 return -EFAULT; 1863 tu->tread = xarg ? 1 : 0; 1864 return 0; 1865 } 1866 case SNDRV_TIMER_IOCTL_GINFO: 1867 return snd_timer_user_ginfo(file, argp); 1868 case SNDRV_TIMER_IOCTL_GPARAMS: 1869 return snd_timer_user_gparams(file, argp); 1870 case SNDRV_TIMER_IOCTL_GSTATUS: 1871 return snd_timer_user_gstatus(file, argp); 1872 case SNDRV_TIMER_IOCTL_SELECT: 1873 return snd_timer_user_tselect(file, argp); 1874 case SNDRV_TIMER_IOCTL_INFO: 1875 return snd_timer_user_info(file, argp); 1876 case SNDRV_TIMER_IOCTL_PARAMS: 1877 return snd_timer_user_params(file, argp); 1878 case SNDRV_TIMER_IOCTL_STATUS: 1879 return snd_timer_user_status(file, argp); 1880 case SNDRV_TIMER_IOCTL_START: 1881 case SNDRV_TIMER_IOCTL_START_OLD: 1882 return snd_timer_user_start(file); 1883 case SNDRV_TIMER_IOCTL_STOP: 1884 case SNDRV_TIMER_IOCTL_STOP_OLD: 1885 return snd_timer_user_stop(file); 1886 case SNDRV_TIMER_IOCTL_CONTINUE: 1887 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1888 return snd_timer_user_continue(file); 1889 case SNDRV_TIMER_IOCTL_PAUSE: 1890 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1891 return snd_timer_user_pause(file); 1892 } 1893 return -ENOTTY; 1894 } 1895 1896 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1897 unsigned long arg) 1898 { 1899 struct snd_timer_user *tu = file->private_data; 1900 long ret; 1901 1902 mutex_lock(&tu->ioctl_lock); 1903 ret = __snd_timer_user_ioctl(file, cmd, arg); 1904 mutex_unlock(&tu->ioctl_lock); 1905 return ret; 1906 } 1907 1908 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1909 { 1910 struct snd_timer_user *tu; 1911 1912 tu = file->private_data; 1913 return fasync_helper(fd, file, on, &tu->fasync); 1914 } 1915 1916 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1917 size_t count, loff_t *offset) 1918 { 1919 struct snd_timer_user *tu; 1920 long result = 0, unit; 1921 int qhead; 1922 int err = 0; 1923 1924 tu = file->private_data; 1925 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1926 spin_lock_irq(&tu->qlock); 1927 while ((long)count - result >= unit) { 1928 while (!tu->qused) { 1929 wait_queue_t wait; 1930 1931 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1932 err = -EAGAIN; 1933 goto _error; 1934 } 1935 1936 set_current_state(TASK_INTERRUPTIBLE); 1937 init_waitqueue_entry(&wait, current); 1938 add_wait_queue(&tu->qchange_sleep, &wait); 1939 1940 spin_unlock_irq(&tu->qlock); 1941 schedule(); 1942 spin_lock_irq(&tu->qlock); 1943 1944 remove_wait_queue(&tu->qchange_sleep, &wait); 1945 1946 if (tu->disconnected) { 1947 err = -ENODEV; 1948 goto _error; 1949 } 1950 if (signal_pending(current)) { 1951 err = -ERESTARTSYS; 1952 goto _error; 1953 } 1954 } 1955 1956 qhead = tu->qhead++; 1957 tu->qhead %= tu->queue_size; 1958 spin_unlock_irq(&tu->qlock); 1959 1960 if (tu->tread) { 1961 if (copy_to_user(buffer, &tu->tqueue[qhead], 1962 sizeof(struct snd_timer_tread))) 1963 err = -EFAULT; 1964 } else { 1965 if (copy_to_user(buffer, &tu->queue[qhead], 1966 sizeof(struct snd_timer_read))) 1967 err = -EFAULT; 1968 } 1969 1970 spin_lock_irq(&tu->qlock); 1971 tu->qused--; 1972 if (err < 0) 1973 goto _error; 1974 result += unit; 1975 buffer += unit; 1976 } 1977 _error: 1978 spin_unlock_irq(&tu->qlock); 1979 return result > 0 ? result : err; 1980 } 1981 1982 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1983 { 1984 unsigned int mask; 1985 struct snd_timer_user *tu; 1986 1987 tu = file->private_data; 1988 1989 poll_wait(file, &tu->qchange_sleep, wait); 1990 1991 mask = 0; 1992 if (tu->qused) 1993 mask |= POLLIN | POLLRDNORM; 1994 if (tu->disconnected) 1995 mask |= POLLERR; 1996 1997 return mask; 1998 } 1999 2000 #ifdef CONFIG_COMPAT 2001 #include "timer_compat.c" 2002 #else 2003 #define snd_timer_user_ioctl_compat NULL 2004 #endif 2005 2006 static const struct file_operations snd_timer_f_ops = 2007 { 2008 .owner = THIS_MODULE, 2009 .read = snd_timer_user_read, 2010 .open = snd_timer_user_open, 2011 .release = snd_timer_user_release, 2012 .llseek = no_llseek, 2013 .poll = snd_timer_user_poll, 2014 .unlocked_ioctl = snd_timer_user_ioctl, 2015 .compat_ioctl = snd_timer_user_ioctl_compat, 2016 .fasync = snd_timer_user_fasync, 2017 }; 2018 2019 /* unregister the system timer */ 2020 static void snd_timer_free_all(void) 2021 { 2022 struct snd_timer *timer, *n; 2023 2024 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2025 snd_timer_free(timer); 2026 } 2027 2028 static struct device timer_dev; 2029 2030 /* 2031 * ENTRY functions 2032 */ 2033 2034 static int __init alsa_timer_init(void) 2035 { 2036 int err; 2037 2038 snd_device_initialize(&timer_dev, NULL); 2039 dev_set_name(&timer_dev, "timer"); 2040 2041 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2042 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2043 "system timer"); 2044 #endif 2045 2046 err = snd_timer_register_system(); 2047 if (err < 0) { 2048 pr_err("ALSA: unable to register system timer (%i)\n", err); 2049 put_device(&timer_dev); 2050 return err; 2051 } 2052 2053 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2054 &snd_timer_f_ops, NULL, &timer_dev); 2055 if (err < 0) { 2056 pr_err("ALSA: unable to register timer device (%i)\n", err); 2057 snd_timer_free_all(); 2058 put_device(&timer_dev); 2059 return err; 2060 } 2061 2062 snd_timer_proc_init(); 2063 return 0; 2064 } 2065 2066 static void __exit alsa_timer_exit(void) 2067 { 2068 snd_unregister_device(&timer_dev); 2069 snd_timer_free_all(); 2070 put_device(&timer_dev); 2071 snd_timer_proc_done(); 2072 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2073 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2074 #endif 2075 } 2076 2077 module_init(alsa_timer_init) 2078 module_exit(alsa_timer_exit) 2079 2080 EXPORT_SYMBOL(snd_timer_open); 2081 EXPORT_SYMBOL(snd_timer_close); 2082 EXPORT_SYMBOL(snd_timer_resolution); 2083 EXPORT_SYMBOL(snd_timer_start); 2084 EXPORT_SYMBOL(snd_timer_stop); 2085 EXPORT_SYMBOL(snd_timer_continue); 2086 EXPORT_SYMBOL(snd_timer_pause); 2087 EXPORT_SYMBOL(snd_timer_new); 2088 EXPORT_SYMBOL(snd_timer_notify); 2089 EXPORT_SYMBOL(snd_timer_global_new); 2090 EXPORT_SYMBOL(snd_timer_global_free); 2091 EXPORT_SYMBOL(snd_timer_global_register); 2092 EXPORT_SYMBOL(snd_timer_interrupt); 2093