1 /* 2 * Timers abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/delay.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/time.h> 26 #include <linux/mutex.h> 27 #include <linux/device.h> 28 #include <linux/module.h> 29 #include <linux/string.h> 30 #include <sound/core.h> 31 #include <sound/timer.h> 32 #include <sound/control.h> 33 #include <sound/info.h> 34 #include <sound/minors.h> 35 #include <sound/initval.h> 36 #include <linux/kmod.h> 37 38 #if IS_ENABLED(CONFIG_SND_HRTIMER) 39 #define DEFAULT_TIMER_LIMIT 4 40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER) 41 #define DEFAULT_TIMER_LIMIT 2 42 #else 43 #define DEFAULT_TIMER_LIMIT 1 44 #endif 45 46 static int timer_limit = DEFAULT_TIMER_LIMIT; 47 static int timer_tstamp_monotonic = 1; 48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 49 MODULE_DESCRIPTION("ALSA timer interface"); 50 MODULE_LICENSE("GPL"); 51 module_param(timer_limit, int, 0444); 52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 53 module_param(timer_tstamp_monotonic, int, 0444); 54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 55 56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 57 MODULE_ALIAS("devname:snd/timer"); 58 59 struct snd_timer_user { 60 struct snd_timer_instance *timeri; 61 int tread; /* enhanced read with timestamps and events */ 62 unsigned long ticks; 63 unsigned long overrun; 64 int qhead; 65 int qtail; 66 int qused; 67 int queue_size; 68 bool disconnected; 69 struct snd_timer_read *queue; 70 struct snd_timer_tread *tqueue; 71 spinlock_t qlock; 72 unsigned long last_resolution; 73 unsigned int filter; 74 struct timespec tstamp; /* trigger tstamp */ 75 wait_queue_head_t qchange_sleep; 76 struct fasync_struct *fasync; 77 struct mutex ioctl_lock; 78 }; 79 80 /* list of timers */ 81 static LIST_HEAD(snd_timer_list); 82 83 /* list of slave instances */ 84 static LIST_HEAD(snd_timer_slave_list); 85 86 /* lock for slave active lists */ 87 static DEFINE_SPINLOCK(slave_active_lock); 88 89 static DEFINE_MUTEX(register_mutex); 90 91 static int snd_timer_free(struct snd_timer *timer); 92 static int snd_timer_dev_free(struct snd_device *device); 93 static int snd_timer_dev_register(struct snd_device *device); 94 static int snd_timer_dev_disconnect(struct snd_device *device); 95 96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 97 98 /* 99 * create a timer instance with the given owner string. 100 * when timer is not NULL, increments the module counter 101 */ 102 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 103 struct snd_timer *timer) 104 { 105 struct snd_timer_instance *timeri; 106 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 107 if (timeri == NULL) 108 return NULL; 109 timeri->owner = kstrdup(owner, GFP_KERNEL); 110 if (! timeri->owner) { 111 kfree(timeri); 112 return NULL; 113 } 114 INIT_LIST_HEAD(&timeri->open_list); 115 INIT_LIST_HEAD(&timeri->active_list); 116 INIT_LIST_HEAD(&timeri->ack_list); 117 INIT_LIST_HEAD(&timeri->slave_list_head); 118 INIT_LIST_HEAD(&timeri->slave_active_head); 119 120 timeri->timer = timer; 121 if (timer && !try_module_get(timer->module)) { 122 kfree(timeri->owner); 123 kfree(timeri); 124 return NULL; 125 } 126 127 return timeri; 128 } 129 130 /* 131 * find a timer instance from the given timer id 132 */ 133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 134 { 135 struct snd_timer *timer = NULL; 136 137 list_for_each_entry(timer, &snd_timer_list, device_list) { 138 if (timer->tmr_class != tid->dev_class) 139 continue; 140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 142 (timer->card == NULL || 143 timer->card->number != tid->card)) 144 continue; 145 if (timer->tmr_device != tid->device) 146 continue; 147 if (timer->tmr_subdevice != tid->subdevice) 148 continue; 149 return timer; 150 } 151 return NULL; 152 } 153 154 #ifdef CONFIG_MODULES 155 156 static void snd_timer_request(struct snd_timer_id *tid) 157 { 158 switch (tid->dev_class) { 159 case SNDRV_TIMER_CLASS_GLOBAL: 160 if (tid->device < timer_limit) 161 request_module("snd-timer-%i", tid->device); 162 break; 163 case SNDRV_TIMER_CLASS_CARD: 164 case SNDRV_TIMER_CLASS_PCM: 165 if (tid->card < snd_ecards_limit) 166 request_module("snd-card-%i", tid->card); 167 break; 168 default: 169 break; 170 } 171 } 172 173 #endif 174 175 /* 176 * look for a master instance matching with the slave id of the given slave. 177 * when found, relink the open_link of the slave. 178 * 179 * call this with register_mutex down. 180 */ 181 static void snd_timer_check_slave(struct snd_timer_instance *slave) 182 { 183 struct snd_timer *timer; 184 struct snd_timer_instance *master; 185 186 /* FIXME: it's really dumb to look up all entries.. */ 187 list_for_each_entry(timer, &snd_timer_list, device_list) { 188 list_for_each_entry(master, &timer->open_list_head, open_list) { 189 if (slave->slave_class == master->slave_class && 190 slave->slave_id == master->slave_id) { 191 list_move_tail(&slave->open_list, 192 &master->slave_list_head); 193 spin_lock_irq(&slave_active_lock); 194 slave->master = master; 195 slave->timer = master->timer; 196 spin_unlock_irq(&slave_active_lock); 197 return; 198 } 199 } 200 } 201 } 202 203 /* 204 * look for slave instances matching with the slave id of the given master. 205 * when found, relink the open_link of slaves. 206 * 207 * call this with register_mutex down. 208 */ 209 static void snd_timer_check_master(struct snd_timer_instance *master) 210 { 211 struct snd_timer_instance *slave, *tmp; 212 213 /* check all pending slaves */ 214 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 215 if (slave->slave_class == master->slave_class && 216 slave->slave_id == master->slave_id) { 217 list_move_tail(&slave->open_list, &master->slave_list_head); 218 spin_lock_irq(&slave_active_lock); 219 spin_lock(&master->timer->lock); 220 slave->master = master; 221 slave->timer = master->timer; 222 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 223 list_add_tail(&slave->active_list, 224 &master->slave_active_head); 225 spin_unlock(&master->timer->lock); 226 spin_unlock_irq(&slave_active_lock); 227 } 228 } 229 } 230 231 /* 232 * open a timer instance 233 * when opening a master, the slave id must be here given. 234 */ 235 int snd_timer_open(struct snd_timer_instance **ti, 236 char *owner, struct snd_timer_id *tid, 237 unsigned int slave_id) 238 { 239 struct snd_timer *timer; 240 struct snd_timer_instance *timeri = NULL; 241 242 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 243 /* open a slave instance */ 244 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 245 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 246 pr_debug("ALSA: timer: invalid slave class %i\n", 247 tid->dev_sclass); 248 return -EINVAL; 249 } 250 mutex_lock(®ister_mutex); 251 timeri = snd_timer_instance_new(owner, NULL); 252 if (!timeri) { 253 mutex_unlock(®ister_mutex); 254 return -ENOMEM; 255 } 256 timeri->slave_class = tid->dev_sclass; 257 timeri->slave_id = tid->device; 258 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 259 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 260 snd_timer_check_slave(timeri); 261 mutex_unlock(®ister_mutex); 262 *ti = timeri; 263 return 0; 264 } 265 266 /* open a master instance */ 267 mutex_lock(®ister_mutex); 268 timer = snd_timer_find(tid); 269 #ifdef CONFIG_MODULES 270 if (!timer) { 271 mutex_unlock(®ister_mutex); 272 snd_timer_request(tid); 273 mutex_lock(®ister_mutex); 274 timer = snd_timer_find(tid); 275 } 276 #endif 277 if (!timer) { 278 mutex_unlock(®ister_mutex); 279 return -ENODEV; 280 } 281 if (!list_empty(&timer->open_list_head)) { 282 timeri = list_entry(timer->open_list_head.next, 283 struct snd_timer_instance, open_list); 284 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 285 mutex_unlock(®ister_mutex); 286 return -EBUSY; 287 } 288 } 289 timeri = snd_timer_instance_new(owner, timer); 290 if (!timeri) { 291 mutex_unlock(®ister_mutex); 292 return -ENOMEM; 293 } 294 /* take a card refcount for safe disconnection */ 295 if (timer->card) 296 get_device(&timer->card->card_dev); 297 timeri->slave_class = tid->dev_sclass; 298 timeri->slave_id = slave_id; 299 if (list_empty(&timer->open_list_head) && timer->hw.open) 300 timer->hw.open(timer); 301 list_add_tail(&timeri->open_list, &timer->open_list_head); 302 snd_timer_check_master(timeri); 303 mutex_unlock(®ister_mutex); 304 *ti = timeri; 305 return 0; 306 } 307 308 /* 309 * close a timer instance 310 */ 311 int snd_timer_close(struct snd_timer_instance *timeri) 312 { 313 struct snd_timer *timer = NULL; 314 struct snd_timer_instance *slave, *tmp; 315 316 if (snd_BUG_ON(!timeri)) 317 return -ENXIO; 318 319 mutex_lock(®ister_mutex); 320 list_del(&timeri->open_list); 321 322 /* force to stop the timer */ 323 snd_timer_stop(timeri); 324 325 timer = timeri->timer; 326 if (timer) { 327 /* wait, until the active callback is finished */ 328 spin_lock_irq(&timer->lock); 329 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 330 spin_unlock_irq(&timer->lock); 331 udelay(10); 332 spin_lock_irq(&timer->lock); 333 } 334 spin_unlock_irq(&timer->lock); 335 336 /* remove slave links */ 337 spin_lock_irq(&slave_active_lock); 338 spin_lock(&timer->lock); 339 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 340 open_list) { 341 list_move_tail(&slave->open_list, &snd_timer_slave_list); 342 slave->master = NULL; 343 slave->timer = NULL; 344 list_del_init(&slave->ack_list); 345 list_del_init(&slave->active_list); 346 } 347 spin_unlock(&timer->lock); 348 spin_unlock_irq(&slave_active_lock); 349 350 /* slave doesn't need to release timer resources below */ 351 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 352 timer = NULL; 353 } 354 355 if (timeri->private_free) 356 timeri->private_free(timeri); 357 kfree(timeri->owner); 358 kfree(timeri); 359 360 if (timer) { 361 if (list_empty(&timer->open_list_head) && timer->hw.close) 362 timer->hw.close(timer); 363 /* release a card refcount for safe disconnection */ 364 if (timer->card) 365 put_device(&timer->card->card_dev); 366 module_put(timer->module); 367 } 368 369 mutex_unlock(®ister_mutex); 370 return 0; 371 } 372 373 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 374 { 375 struct snd_timer * timer; 376 377 if (timeri == NULL) 378 return 0; 379 if ((timer = timeri->timer) != NULL) { 380 if (timer->hw.c_resolution) 381 return timer->hw.c_resolution(timer); 382 return timer->hw.resolution; 383 } 384 return 0; 385 } 386 387 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 388 { 389 struct snd_timer *timer; 390 unsigned long resolution = 0; 391 struct snd_timer_instance *ts; 392 struct timespec tstamp; 393 394 if (timer_tstamp_monotonic) 395 ktime_get_ts(&tstamp); 396 else 397 getnstimeofday(&tstamp); 398 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 399 event > SNDRV_TIMER_EVENT_PAUSE)) 400 return; 401 if (event == SNDRV_TIMER_EVENT_START || 402 event == SNDRV_TIMER_EVENT_CONTINUE) 403 resolution = snd_timer_resolution(ti); 404 if (ti->ccallback) 405 ti->ccallback(ti, event, &tstamp, resolution); 406 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 407 return; 408 timer = ti->timer; 409 if (timer == NULL) 410 return; 411 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 412 return; 413 list_for_each_entry(ts, &ti->slave_active_head, active_list) 414 if (ts->ccallback) 415 ts->ccallback(ts, event + 100, &tstamp, resolution); 416 } 417 418 /* start/continue a master timer */ 419 static int snd_timer_start1(struct snd_timer_instance *timeri, 420 bool start, unsigned long ticks) 421 { 422 struct snd_timer *timer; 423 int result; 424 unsigned long flags; 425 426 timer = timeri->timer; 427 if (!timer) 428 return -EINVAL; 429 430 spin_lock_irqsave(&timer->lock, flags); 431 if (timer->card && timer->card->shutdown) { 432 result = -ENODEV; 433 goto unlock; 434 } 435 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 436 SNDRV_TIMER_IFLG_START)) { 437 result = -EBUSY; 438 goto unlock; 439 } 440 441 if (start) 442 timeri->ticks = timeri->cticks = ticks; 443 else if (!timeri->cticks) 444 timeri->cticks = 1; 445 timeri->pticks = 0; 446 447 list_move_tail(&timeri->active_list, &timer->active_list_head); 448 if (timer->running) { 449 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 450 goto __start_now; 451 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 452 timeri->flags |= SNDRV_TIMER_IFLG_START; 453 result = 1; /* delayed start */ 454 } else { 455 if (start) 456 timer->sticks = ticks; 457 timer->hw.start(timer); 458 __start_now: 459 timer->running++; 460 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 461 result = 0; 462 } 463 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 464 SNDRV_TIMER_EVENT_CONTINUE); 465 unlock: 466 spin_unlock_irqrestore(&timer->lock, flags); 467 return result; 468 } 469 470 /* start/continue a slave timer */ 471 static int snd_timer_start_slave(struct snd_timer_instance *timeri, 472 bool start) 473 { 474 unsigned long flags; 475 476 spin_lock_irqsave(&slave_active_lock, flags); 477 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 478 spin_unlock_irqrestore(&slave_active_lock, flags); 479 return -EBUSY; 480 } 481 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 482 if (timeri->master && timeri->timer) { 483 spin_lock(&timeri->timer->lock); 484 list_add_tail(&timeri->active_list, 485 &timeri->master->slave_active_head); 486 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 487 SNDRV_TIMER_EVENT_CONTINUE); 488 spin_unlock(&timeri->timer->lock); 489 } 490 spin_unlock_irqrestore(&slave_active_lock, flags); 491 return 1; /* delayed start */ 492 } 493 494 /* stop/pause a master timer */ 495 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) 496 { 497 struct snd_timer *timer; 498 int result = 0; 499 unsigned long flags; 500 501 timer = timeri->timer; 502 if (!timer) 503 return -EINVAL; 504 spin_lock_irqsave(&timer->lock, flags); 505 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 506 SNDRV_TIMER_IFLG_START))) { 507 result = -EBUSY; 508 goto unlock; 509 } 510 list_del_init(&timeri->ack_list); 511 list_del_init(&timeri->active_list); 512 if (timer->card && timer->card->shutdown) 513 goto unlock; 514 if (stop) { 515 timeri->cticks = timeri->ticks; 516 timeri->pticks = 0; 517 } 518 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 519 !(--timer->running)) { 520 timer->hw.stop(timer); 521 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 522 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 523 snd_timer_reschedule(timer, 0); 524 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 525 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 526 timer->hw.start(timer); 527 } 528 } 529 } 530 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 531 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 532 SNDRV_TIMER_EVENT_CONTINUE); 533 unlock: 534 spin_unlock_irqrestore(&timer->lock, flags); 535 return result; 536 } 537 538 /* stop/pause a slave timer */ 539 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) 540 { 541 unsigned long flags; 542 543 spin_lock_irqsave(&slave_active_lock, flags); 544 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) { 545 spin_unlock_irqrestore(&slave_active_lock, flags); 546 return -EBUSY; 547 } 548 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 549 if (timeri->timer) { 550 spin_lock(&timeri->timer->lock); 551 list_del_init(&timeri->ack_list); 552 list_del_init(&timeri->active_list); 553 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 554 SNDRV_TIMER_EVENT_CONTINUE); 555 spin_unlock(&timeri->timer->lock); 556 } 557 spin_unlock_irqrestore(&slave_active_lock, flags); 558 return 0; 559 } 560 561 /* 562 * start the timer instance 563 */ 564 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 565 { 566 if (timeri == NULL || ticks < 1) 567 return -EINVAL; 568 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 569 return snd_timer_start_slave(timeri, true); 570 else 571 return snd_timer_start1(timeri, true, ticks); 572 } 573 574 /* 575 * stop the timer instance. 576 * 577 * do not call this from the timer callback! 578 */ 579 int snd_timer_stop(struct snd_timer_instance *timeri) 580 { 581 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 582 return snd_timer_stop_slave(timeri, true); 583 else 584 return snd_timer_stop1(timeri, true); 585 } 586 587 /* 588 * start again.. the tick is kept. 589 */ 590 int snd_timer_continue(struct snd_timer_instance *timeri) 591 { 592 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 593 return snd_timer_start_slave(timeri, false); 594 else 595 return snd_timer_start1(timeri, false, 0); 596 } 597 598 /* 599 * pause.. remember the ticks left 600 */ 601 int snd_timer_pause(struct snd_timer_instance * timeri) 602 { 603 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 604 return snd_timer_stop_slave(timeri, false); 605 else 606 return snd_timer_stop1(timeri, false); 607 } 608 609 /* 610 * reschedule the timer 611 * 612 * start pending instances and check the scheduling ticks. 613 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 614 */ 615 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 616 { 617 struct snd_timer_instance *ti; 618 unsigned long ticks = ~0UL; 619 620 list_for_each_entry(ti, &timer->active_list_head, active_list) { 621 if (ti->flags & SNDRV_TIMER_IFLG_START) { 622 ti->flags &= ~SNDRV_TIMER_IFLG_START; 623 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 624 timer->running++; 625 } 626 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 627 if (ticks > ti->cticks) 628 ticks = ti->cticks; 629 } 630 } 631 if (ticks == ~0UL) { 632 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 633 return; 634 } 635 if (ticks > timer->hw.ticks) 636 ticks = timer->hw.ticks; 637 if (ticks_left != ticks) 638 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 639 timer->sticks = ticks; 640 } 641 642 /* 643 * timer tasklet 644 * 645 */ 646 static void snd_timer_tasklet(unsigned long arg) 647 { 648 struct snd_timer *timer = (struct snd_timer *) arg; 649 struct snd_timer_instance *ti; 650 struct list_head *p; 651 unsigned long resolution, ticks; 652 unsigned long flags; 653 654 if (timer->card && timer->card->shutdown) 655 return; 656 657 spin_lock_irqsave(&timer->lock, flags); 658 /* now process all callbacks */ 659 while (!list_empty(&timer->sack_list_head)) { 660 p = timer->sack_list_head.next; /* get first item */ 661 ti = list_entry(p, struct snd_timer_instance, ack_list); 662 663 /* remove from ack_list and make empty */ 664 list_del_init(p); 665 666 ticks = ti->pticks; 667 ti->pticks = 0; 668 resolution = ti->resolution; 669 670 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 671 spin_unlock(&timer->lock); 672 if (ti->callback) 673 ti->callback(ti, resolution, ticks); 674 spin_lock(&timer->lock); 675 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 676 } 677 spin_unlock_irqrestore(&timer->lock, flags); 678 } 679 680 /* 681 * timer interrupt 682 * 683 * ticks_left is usually equal to timer->sticks. 684 * 685 */ 686 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 687 { 688 struct snd_timer_instance *ti, *ts, *tmp; 689 unsigned long resolution, ticks; 690 struct list_head *p, *ack_list_head; 691 unsigned long flags; 692 int use_tasklet = 0; 693 694 if (timer == NULL) 695 return; 696 697 if (timer->card && timer->card->shutdown) 698 return; 699 700 spin_lock_irqsave(&timer->lock, flags); 701 702 /* remember the current resolution */ 703 if (timer->hw.c_resolution) 704 resolution = timer->hw.c_resolution(timer); 705 else 706 resolution = timer->hw.resolution; 707 708 /* loop for all active instances 709 * Here we cannot use list_for_each_entry because the active_list of a 710 * processed instance is relinked to done_list_head before the callback 711 * is called. 712 */ 713 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 714 active_list) { 715 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 716 continue; 717 ti->pticks += ticks_left; 718 ti->resolution = resolution; 719 if (ti->cticks < ticks_left) 720 ti->cticks = 0; 721 else 722 ti->cticks -= ticks_left; 723 if (ti->cticks) /* not expired */ 724 continue; 725 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 726 ti->cticks = ti->ticks; 727 } else { 728 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 729 --timer->running; 730 list_del_init(&ti->active_list); 731 } 732 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 733 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 734 ack_list_head = &timer->ack_list_head; 735 else 736 ack_list_head = &timer->sack_list_head; 737 if (list_empty(&ti->ack_list)) 738 list_add_tail(&ti->ack_list, ack_list_head); 739 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 740 ts->pticks = ti->pticks; 741 ts->resolution = resolution; 742 if (list_empty(&ts->ack_list)) 743 list_add_tail(&ts->ack_list, ack_list_head); 744 } 745 } 746 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 747 snd_timer_reschedule(timer, timer->sticks); 748 if (timer->running) { 749 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 750 timer->hw.stop(timer); 751 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 752 } 753 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 754 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 755 /* restart timer */ 756 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 757 timer->hw.start(timer); 758 } 759 } else { 760 timer->hw.stop(timer); 761 } 762 763 /* now process all fast callbacks */ 764 while (!list_empty(&timer->ack_list_head)) { 765 p = timer->ack_list_head.next; /* get first item */ 766 ti = list_entry(p, struct snd_timer_instance, ack_list); 767 768 /* remove from ack_list and make empty */ 769 list_del_init(p); 770 771 ticks = ti->pticks; 772 ti->pticks = 0; 773 774 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 775 spin_unlock(&timer->lock); 776 if (ti->callback) 777 ti->callback(ti, resolution, ticks); 778 spin_lock(&timer->lock); 779 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 780 } 781 782 /* do we have any slow callbacks? */ 783 use_tasklet = !list_empty(&timer->sack_list_head); 784 spin_unlock_irqrestore(&timer->lock, flags); 785 786 if (use_tasklet) 787 tasklet_schedule(&timer->task_queue); 788 } 789 790 /* 791 792 */ 793 794 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 795 struct snd_timer **rtimer) 796 { 797 struct snd_timer *timer; 798 int err; 799 static struct snd_device_ops ops = { 800 .dev_free = snd_timer_dev_free, 801 .dev_register = snd_timer_dev_register, 802 .dev_disconnect = snd_timer_dev_disconnect, 803 }; 804 805 if (snd_BUG_ON(!tid)) 806 return -EINVAL; 807 if (rtimer) 808 *rtimer = NULL; 809 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 810 if (!timer) 811 return -ENOMEM; 812 timer->tmr_class = tid->dev_class; 813 timer->card = card; 814 timer->tmr_device = tid->device; 815 timer->tmr_subdevice = tid->subdevice; 816 if (id) 817 strlcpy(timer->id, id, sizeof(timer->id)); 818 INIT_LIST_HEAD(&timer->device_list); 819 INIT_LIST_HEAD(&timer->open_list_head); 820 INIT_LIST_HEAD(&timer->active_list_head); 821 INIT_LIST_HEAD(&timer->ack_list_head); 822 INIT_LIST_HEAD(&timer->sack_list_head); 823 spin_lock_init(&timer->lock); 824 tasklet_init(&timer->task_queue, snd_timer_tasklet, 825 (unsigned long)timer); 826 if (card != NULL) { 827 timer->module = card->module; 828 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 829 if (err < 0) { 830 snd_timer_free(timer); 831 return err; 832 } 833 } 834 if (rtimer) 835 *rtimer = timer; 836 return 0; 837 } 838 839 static int snd_timer_free(struct snd_timer *timer) 840 { 841 if (!timer) 842 return 0; 843 844 mutex_lock(®ister_mutex); 845 if (! list_empty(&timer->open_list_head)) { 846 struct list_head *p, *n; 847 struct snd_timer_instance *ti; 848 pr_warn("ALSA: timer %p is busy?\n", timer); 849 list_for_each_safe(p, n, &timer->open_list_head) { 850 list_del_init(p); 851 ti = list_entry(p, struct snd_timer_instance, open_list); 852 ti->timer = NULL; 853 } 854 } 855 list_del(&timer->device_list); 856 mutex_unlock(®ister_mutex); 857 858 if (timer->private_free) 859 timer->private_free(timer); 860 kfree(timer); 861 return 0; 862 } 863 864 static int snd_timer_dev_free(struct snd_device *device) 865 { 866 struct snd_timer *timer = device->device_data; 867 return snd_timer_free(timer); 868 } 869 870 static int snd_timer_dev_register(struct snd_device *dev) 871 { 872 struct snd_timer *timer = dev->device_data; 873 struct snd_timer *timer1; 874 875 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 876 return -ENXIO; 877 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 878 !timer->hw.resolution && timer->hw.c_resolution == NULL) 879 return -EINVAL; 880 881 mutex_lock(®ister_mutex); 882 list_for_each_entry(timer1, &snd_timer_list, device_list) { 883 if (timer1->tmr_class > timer->tmr_class) 884 break; 885 if (timer1->tmr_class < timer->tmr_class) 886 continue; 887 if (timer1->card && timer->card) { 888 if (timer1->card->number > timer->card->number) 889 break; 890 if (timer1->card->number < timer->card->number) 891 continue; 892 } 893 if (timer1->tmr_device > timer->tmr_device) 894 break; 895 if (timer1->tmr_device < timer->tmr_device) 896 continue; 897 if (timer1->tmr_subdevice > timer->tmr_subdevice) 898 break; 899 if (timer1->tmr_subdevice < timer->tmr_subdevice) 900 continue; 901 /* conflicts.. */ 902 mutex_unlock(®ister_mutex); 903 return -EBUSY; 904 } 905 list_add_tail(&timer->device_list, &timer1->device_list); 906 mutex_unlock(®ister_mutex); 907 return 0; 908 } 909 910 static int snd_timer_dev_disconnect(struct snd_device *device) 911 { 912 struct snd_timer *timer = device->device_data; 913 struct snd_timer_instance *ti; 914 915 mutex_lock(®ister_mutex); 916 list_del_init(&timer->device_list); 917 /* wake up pending sleepers */ 918 list_for_each_entry(ti, &timer->open_list_head, open_list) { 919 if (ti->disconnect) 920 ti->disconnect(ti); 921 } 922 mutex_unlock(®ister_mutex); 923 return 0; 924 } 925 926 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 927 { 928 unsigned long flags; 929 unsigned long resolution = 0; 930 struct snd_timer_instance *ti, *ts; 931 932 if (timer->card && timer->card->shutdown) 933 return; 934 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 935 return; 936 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 937 event > SNDRV_TIMER_EVENT_MRESUME)) 938 return; 939 spin_lock_irqsave(&timer->lock, flags); 940 if (event == SNDRV_TIMER_EVENT_MSTART || 941 event == SNDRV_TIMER_EVENT_MCONTINUE || 942 event == SNDRV_TIMER_EVENT_MRESUME) { 943 if (timer->hw.c_resolution) 944 resolution = timer->hw.c_resolution(timer); 945 else 946 resolution = timer->hw.resolution; 947 } 948 list_for_each_entry(ti, &timer->active_list_head, active_list) { 949 if (ti->ccallback) 950 ti->ccallback(ti, event, tstamp, resolution); 951 list_for_each_entry(ts, &ti->slave_active_head, active_list) 952 if (ts->ccallback) 953 ts->ccallback(ts, event, tstamp, resolution); 954 } 955 spin_unlock_irqrestore(&timer->lock, flags); 956 } 957 958 /* 959 * exported functions for global timers 960 */ 961 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 962 { 963 struct snd_timer_id tid; 964 965 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 966 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 967 tid.card = -1; 968 tid.device = device; 969 tid.subdevice = 0; 970 return snd_timer_new(NULL, id, &tid, rtimer); 971 } 972 973 int snd_timer_global_free(struct snd_timer *timer) 974 { 975 return snd_timer_free(timer); 976 } 977 978 int snd_timer_global_register(struct snd_timer *timer) 979 { 980 struct snd_device dev; 981 982 memset(&dev, 0, sizeof(dev)); 983 dev.device_data = timer; 984 return snd_timer_dev_register(&dev); 985 } 986 987 /* 988 * System timer 989 */ 990 991 struct snd_timer_system_private { 992 struct timer_list tlist; 993 unsigned long last_expires; 994 unsigned long last_jiffies; 995 unsigned long correction; 996 }; 997 998 static void snd_timer_s_function(unsigned long data) 999 { 1000 struct snd_timer *timer = (struct snd_timer *)data; 1001 struct snd_timer_system_private *priv = timer->private_data; 1002 unsigned long jiff = jiffies; 1003 if (time_after(jiff, priv->last_expires)) 1004 priv->correction += (long)jiff - (long)priv->last_expires; 1005 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1006 } 1007 1008 static int snd_timer_s_start(struct snd_timer * timer) 1009 { 1010 struct snd_timer_system_private *priv; 1011 unsigned long njiff; 1012 1013 priv = (struct snd_timer_system_private *) timer->private_data; 1014 njiff = (priv->last_jiffies = jiffies); 1015 if (priv->correction > timer->sticks - 1) { 1016 priv->correction -= timer->sticks - 1; 1017 njiff++; 1018 } else { 1019 njiff += timer->sticks - priv->correction; 1020 priv->correction = 0; 1021 } 1022 priv->last_expires = njiff; 1023 mod_timer(&priv->tlist, njiff); 1024 return 0; 1025 } 1026 1027 static int snd_timer_s_stop(struct snd_timer * timer) 1028 { 1029 struct snd_timer_system_private *priv; 1030 unsigned long jiff; 1031 1032 priv = (struct snd_timer_system_private *) timer->private_data; 1033 del_timer(&priv->tlist); 1034 jiff = jiffies; 1035 if (time_before(jiff, priv->last_expires)) 1036 timer->sticks = priv->last_expires - jiff; 1037 else 1038 timer->sticks = 1; 1039 priv->correction = 0; 1040 return 0; 1041 } 1042 1043 static int snd_timer_s_close(struct snd_timer *timer) 1044 { 1045 struct snd_timer_system_private *priv; 1046 1047 priv = (struct snd_timer_system_private *)timer->private_data; 1048 del_timer_sync(&priv->tlist); 1049 return 0; 1050 } 1051 1052 static struct snd_timer_hardware snd_timer_system = 1053 { 1054 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1055 .resolution = 1000000000L / HZ, 1056 .ticks = 10000000L, 1057 .close = snd_timer_s_close, 1058 .start = snd_timer_s_start, 1059 .stop = snd_timer_s_stop 1060 }; 1061 1062 static void snd_timer_free_system(struct snd_timer *timer) 1063 { 1064 kfree(timer->private_data); 1065 } 1066 1067 static int snd_timer_register_system(void) 1068 { 1069 struct snd_timer *timer; 1070 struct snd_timer_system_private *priv; 1071 int err; 1072 1073 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1074 if (err < 0) 1075 return err; 1076 strcpy(timer->name, "system timer"); 1077 timer->hw = snd_timer_system; 1078 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1079 if (priv == NULL) { 1080 snd_timer_free(timer); 1081 return -ENOMEM; 1082 } 1083 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1084 timer->private_data = priv; 1085 timer->private_free = snd_timer_free_system; 1086 return snd_timer_global_register(timer); 1087 } 1088 1089 #ifdef CONFIG_SND_PROC_FS 1090 /* 1091 * Info interface 1092 */ 1093 1094 static void snd_timer_proc_read(struct snd_info_entry *entry, 1095 struct snd_info_buffer *buffer) 1096 { 1097 struct snd_timer *timer; 1098 struct snd_timer_instance *ti; 1099 1100 mutex_lock(®ister_mutex); 1101 list_for_each_entry(timer, &snd_timer_list, device_list) { 1102 if (timer->card && timer->card->shutdown) 1103 continue; 1104 switch (timer->tmr_class) { 1105 case SNDRV_TIMER_CLASS_GLOBAL: 1106 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1107 break; 1108 case SNDRV_TIMER_CLASS_CARD: 1109 snd_iprintf(buffer, "C%i-%i: ", 1110 timer->card->number, timer->tmr_device); 1111 break; 1112 case SNDRV_TIMER_CLASS_PCM: 1113 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1114 timer->tmr_device, timer->tmr_subdevice); 1115 break; 1116 default: 1117 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1118 timer->card ? timer->card->number : -1, 1119 timer->tmr_device, timer->tmr_subdevice); 1120 } 1121 snd_iprintf(buffer, "%s :", timer->name); 1122 if (timer->hw.resolution) 1123 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1124 timer->hw.resolution / 1000, 1125 timer->hw.resolution % 1000, 1126 timer->hw.ticks); 1127 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1128 snd_iprintf(buffer, " SLAVE"); 1129 snd_iprintf(buffer, "\n"); 1130 list_for_each_entry(ti, &timer->open_list_head, open_list) 1131 snd_iprintf(buffer, " Client %s : %s\n", 1132 ti->owner ? ti->owner : "unknown", 1133 ti->flags & (SNDRV_TIMER_IFLG_START | 1134 SNDRV_TIMER_IFLG_RUNNING) 1135 ? "running" : "stopped"); 1136 } 1137 mutex_unlock(®ister_mutex); 1138 } 1139 1140 static struct snd_info_entry *snd_timer_proc_entry; 1141 1142 static void __init snd_timer_proc_init(void) 1143 { 1144 struct snd_info_entry *entry; 1145 1146 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1147 if (entry != NULL) { 1148 entry->c.text.read = snd_timer_proc_read; 1149 if (snd_info_register(entry) < 0) { 1150 snd_info_free_entry(entry); 1151 entry = NULL; 1152 } 1153 } 1154 snd_timer_proc_entry = entry; 1155 } 1156 1157 static void __exit snd_timer_proc_done(void) 1158 { 1159 snd_info_free_entry(snd_timer_proc_entry); 1160 } 1161 #else /* !CONFIG_SND_PROC_FS */ 1162 #define snd_timer_proc_init() 1163 #define snd_timer_proc_done() 1164 #endif 1165 1166 /* 1167 * USER SPACE interface 1168 */ 1169 1170 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1171 unsigned long resolution, 1172 unsigned long ticks) 1173 { 1174 struct snd_timer_user *tu = timeri->callback_data; 1175 struct snd_timer_read *r; 1176 int prev; 1177 1178 spin_lock(&tu->qlock); 1179 if (tu->qused > 0) { 1180 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1181 r = &tu->queue[prev]; 1182 if (r->resolution == resolution) { 1183 r->ticks += ticks; 1184 goto __wake; 1185 } 1186 } 1187 if (tu->qused >= tu->queue_size) { 1188 tu->overrun++; 1189 } else { 1190 r = &tu->queue[tu->qtail++]; 1191 tu->qtail %= tu->queue_size; 1192 r->resolution = resolution; 1193 r->ticks = ticks; 1194 tu->qused++; 1195 } 1196 __wake: 1197 spin_unlock(&tu->qlock); 1198 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1199 wake_up(&tu->qchange_sleep); 1200 } 1201 1202 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1203 struct snd_timer_tread *tread) 1204 { 1205 if (tu->qused >= tu->queue_size) { 1206 tu->overrun++; 1207 } else { 1208 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1209 tu->qtail %= tu->queue_size; 1210 tu->qused++; 1211 } 1212 } 1213 1214 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1215 int event, 1216 struct timespec *tstamp, 1217 unsigned long resolution) 1218 { 1219 struct snd_timer_user *tu = timeri->callback_data; 1220 struct snd_timer_tread r1; 1221 unsigned long flags; 1222 1223 if (event >= SNDRV_TIMER_EVENT_START && 1224 event <= SNDRV_TIMER_EVENT_PAUSE) 1225 tu->tstamp = *tstamp; 1226 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1227 return; 1228 r1.event = event; 1229 r1.tstamp = *tstamp; 1230 r1.val = resolution; 1231 spin_lock_irqsave(&tu->qlock, flags); 1232 snd_timer_user_append_to_tqueue(tu, &r1); 1233 spin_unlock_irqrestore(&tu->qlock, flags); 1234 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1235 wake_up(&tu->qchange_sleep); 1236 } 1237 1238 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1239 { 1240 struct snd_timer_user *tu = timeri->callback_data; 1241 1242 tu->disconnected = true; 1243 wake_up(&tu->qchange_sleep); 1244 } 1245 1246 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1247 unsigned long resolution, 1248 unsigned long ticks) 1249 { 1250 struct snd_timer_user *tu = timeri->callback_data; 1251 struct snd_timer_tread *r, r1; 1252 struct timespec tstamp; 1253 int prev, append = 0; 1254 1255 memset(&tstamp, 0, sizeof(tstamp)); 1256 spin_lock(&tu->qlock); 1257 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1258 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1259 spin_unlock(&tu->qlock); 1260 return; 1261 } 1262 if (tu->last_resolution != resolution || ticks > 0) { 1263 if (timer_tstamp_monotonic) 1264 ktime_get_ts(&tstamp); 1265 else 1266 getnstimeofday(&tstamp); 1267 } 1268 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1269 tu->last_resolution != resolution) { 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 tread.event = SNDRV_TIMER_EVENT_EARLY; 1743 tread.tstamp.tv_sec = 0; 1744 tread.tstamp.tv_nsec = 0; 1745 tread.val = 0; 1746 snd_timer_user_append_to_tqueue(tu, &tread); 1747 } else { 1748 struct snd_timer_read *r = &tu->queue[0]; 1749 r->resolution = 0; 1750 r->ticks = 0; 1751 tu->qused++; 1752 tu->qtail++; 1753 } 1754 } 1755 tu->filter = params.filter; 1756 tu->ticks = params.ticks; 1757 err = 0; 1758 _end: 1759 if (copy_to_user(_params, ¶ms, sizeof(params))) 1760 return -EFAULT; 1761 return err; 1762 } 1763 1764 static int snd_timer_user_status(struct file *file, 1765 struct snd_timer_status __user *_status) 1766 { 1767 struct snd_timer_user *tu; 1768 struct snd_timer_status status; 1769 1770 tu = file->private_data; 1771 if (!tu->timeri) 1772 return -EBADFD; 1773 memset(&status, 0, sizeof(status)); 1774 status.tstamp = tu->tstamp; 1775 status.resolution = snd_timer_resolution(tu->timeri); 1776 status.lost = tu->timeri->lost; 1777 status.overrun = tu->overrun; 1778 spin_lock_irq(&tu->qlock); 1779 status.queue = tu->qused; 1780 spin_unlock_irq(&tu->qlock); 1781 if (copy_to_user(_status, &status, sizeof(status))) 1782 return -EFAULT; 1783 return 0; 1784 } 1785 1786 static int snd_timer_user_start(struct file *file) 1787 { 1788 int err; 1789 struct snd_timer_user *tu; 1790 1791 tu = file->private_data; 1792 if (!tu->timeri) 1793 return -EBADFD; 1794 snd_timer_stop(tu->timeri); 1795 tu->timeri->lost = 0; 1796 tu->last_resolution = 0; 1797 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1798 } 1799 1800 static int snd_timer_user_stop(struct file *file) 1801 { 1802 int err; 1803 struct snd_timer_user *tu; 1804 1805 tu = file->private_data; 1806 if (!tu->timeri) 1807 return -EBADFD; 1808 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1809 } 1810 1811 static int snd_timer_user_continue(struct file *file) 1812 { 1813 int err; 1814 struct snd_timer_user *tu; 1815 1816 tu = file->private_data; 1817 if (!tu->timeri) 1818 return -EBADFD; 1819 tu->timeri->lost = 0; 1820 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1821 } 1822 1823 static int snd_timer_user_pause(struct file *file) 1824 { 1825 int err; 1826 struct snd_timer_user *tu; 1827 1828 tu = file->private_data; 1829 if (!tu->timeri) 1830 return -EBADFD; 1831 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1832 } 1833 1834 enum { 1835 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1836 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1837 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1838 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1839 }; 1840 1841 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1842 unsigned long arg) 1843 { 1844 struct snd_timer_user *tu; 1845 void __user *argp = (void __user *)arg; 1846 int __user *p = argp; 1847 1848 tu = file->private_data; 1849 switch (cmd) { 1850 case SNDRV_TIMER_IOCTL_PVERSION: 1851 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1852 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1853 return snd_timer_user_next_device(argp); 1854 case SNDRV_TIMER_IOCTL_TREAD: 1855 { 1856 int xarg; 1857 1858 if (tu->timeri) /* too late */ 1859 return -EBUSY; 1860 if (get_user(xarg, p)) 1861 return -EFAULT; 1862 tu->tread = xarg ? 1 : 0; 1863 return 0; 1864 } 1865 case SNDRV_TIMER_IOCTL_GINFO: 1866 return snd_timer_user_ginfo(file, argp); 1867 case SNDRV_TIMER_IOCTL_GPARAMS: 1868 return snd_timer_user_gparams(file, argp); 1869 case SNDRV_TIMER_IOCTL_GSTATUS: 1870 return snd_timer_user_gstatus(file, argp); 1871 case SNDRV_TIMER_IOCTL_SELECT: 1872 return snd_timer_user_tselect(file, argp); 1873 case SNDRV_TIMER_IOCTL_INFO: 1874 return snd_timer_user_info(file, argp); 1875 case SNDRV_TIMER_IOCTL_PARAMS: 1876 return snd_timer_user_params(file, argp); 1877 case SNDRV_TIMER_IOCTL_STATUS: 1878 return snd_timer_user_status(file, argp); 1879 case SNDRV_TIMER_IOCTL_START: 1880 case SNDRV_TIMER_IOCTL_START_OLD: 1881 return snd_timer_user_start(file); 1882 case SNDRV_TIMER_IOCTL_STOP: 1883 case SNDRV_TIMER_IOCTL_STOP_OLD: 1884 return snd_timer_user_stop(file); 1885 case SNDRV_TIMER_IOCTL_CONTINUE: 1886 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1887 return snd_timer_user_continue(file); 1888 case SNDRV_TIMER_IOCTL_PAUSE: 1889 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1890 return snd_timer_user_pause(file); 1891 } 1892 return -ENOTTY; 1893 } 1894 1895 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1896 unsigned long arg) 1897 { 1898 struct snd_timer_user *tu = file->private_data; 1899 long ret; 1900 1901 mutex_lock(&tu->ioctl_lock); 1902 ret = __snd_timer_user_ioctl(file, cmd, arg); 1903 mutex_unlock(&tu->ioctl_lock); 1904 return ret; 1905 } 1906 1907 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1908 { 1909 struct snd_timer_user *tu; 1910 1911 tu = file->private_data; 1912 return fasync_helper(fd, file, on, &tu->fasync); 1913 } 1914 1915 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1916 size_t count, loff_t *offset) 1917 { 1918 struct snd_timer_user *tu; 1919 long result = 0, unit; 1920 int qhead; 1921 int err = 0; 1922 1923 tu = file->private_data; 1924 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1925 spin_lock_irq(&tu->qlock); 1926 while ((long)count - result >= unit) { 1927 while (!tu->qused) { 1928 wait_queue_t wait; 1929 1930 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1931 err = -EAGAIN; 1932 goto _error; 1933 } 1934 1935 set_current_state(TASK_INTERRUPTIBLE); 1936 init_waitqueue_entry(&wait, current); 1937 add_wait_queue(&tu->qchange_sleep, &wait); 1938 1939 spin_unlock_irq(&tu->qlock); 1940 schedule(); 1941 spin_lock_irq(&tu->qlock); 1942 1943 remove_wait_queue(&tu->qchange_sleep, &wait); 1944 1945 if (tu->disconnected) { 1946 err = -ENODEV; 1947 goto _error; 1948 } 1949 if (signal_pending(current)) { 1950 err = -ERESTARTSYS; 1951 goto _error; 1952 } 1953 } 1954 1955 qhead = tu->qhead++; 1956 tu->qhead %= tu->queue_size; 1957 spin_unlock_irq(&tu->qlock); 1958 1959 if (tu->tread) { 1960 if (copy_to_user(buffer, &tu->tqueue[qhead], 1961 sizeof(struct snd_timer_tread))) 1962 err = -EFAULT; 1963 } else { 1964 if (copy_to_user(buffer, &tu->queue[qhead], 1965 sizeof(struct snd_timer_read))) 1966 err = -EFAULT; 1967 } 1968 1969 spin_lock_irq(&tu->qlock); 1970 tu->qused--; 1971 if (err < 0) 1972 goto _error; 1973 result += unit; 1974 buffer += unit; 1975 } 1976 _error: 1977 spin_unlock_irq(&tu->qlock); 1978 return result > 0 ? result : err; 1979 } 1980 1981 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1982 { 1983 unsigned int mask; 1984 struct snd_timer_user *tu; 1985 1986 tu = file->private_data; 1987 1988 poll_wait(file, &tu->qchange_sleep, wait); 1989 1990 mask = 0; 1991 if (tu->qused) 1992 mask |= POLLIN | POLLRDNORM; 1993 if (tu->disconnected) 1994 mask |= POLLERR; 1995 1996 return mask; 1997 } 1998 1999 #ifdef CONFIG_COMPAT 2000 #include "timer_compat.c" 2001 #else 2002 #define snd_timer_user_ioctl_compat NULL 2003 #endif 2004 2005 static const struct file_operations snd_timer_f_ops = 2006 { 2007 .owner = THIS_MODULE, 2008 .read = snd_timer_user_read, 2009 .open = snd_timer_user_open, 2010 .release = snd_timer_user_release, 2011 .llseek = no_llseek, 2012 .poll = snd_timer_user_poll, 2013 .unlocked_ioctl = snd_timer_user_ioctl, 2014 .compat_ioctl = snd_timer_user_ioctl_compat, 2015 .fasync = snd_timer_user_fasync, 2016 }; 2017 2018 /* unregister the system timer */ 2019 static void snd_timer_free_all(void) 2020 { 2021 struct snd_timer *timer, *n; 2022 2023 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2024 snd_timer_free(timer); 2025 } 2026 2027 static struct device timer_dev; 2028 2029 /* 2030 * ENTRY functions 2031 */ 2032 2033 static int __init alsa_timer_init(void) 2034 { 2035 int err; 2036 2037 snd_device_initialize(&timer_dev, NULL); 2038 dev_set_name(&timer_dev, "timer"); 2039 2040 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2041 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2042 "system timer"); 2043 #endif 2044 2045 err = snd_timer_register_system(); 2046 if (err < 0) { 2047 pr_err("ALSA: unable to register system timer (%i)\n", err); 2048 put_device(&timer_dev); 2049 return err; 2050 } 2051 2052 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2053 &snd_timer_f_ops, NULL, &timer_dev); 2054 if (err < 0) { 2055 pr_err("ALSA: unable to register timer device (%i)\n", err); 2056 snd_timer_free_all(); 2057 put_device(&timer_dev); 2058 return err; 2059 } 2060 2061 snd_timer_proc_init(); 2062 return 0; 2063 } 2064 2065 static void __exit alsa_timer_exit(void) 2066 { 2067 snd_unregister_device(&timer_dev); 2068 snd_timer_free_all(); 2069 put_device(&timer_dev); 2070 snd_timer_proc_done(); 2071 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2072 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2073 #endif 2074 } 2075 2076 module_init(alsa_timer_init) 2077 module_exit(alsa_timer_exit) 2078 2079 EXPORT_SYMBOL(snd_timer_open); 2080 EXPORT_SYMBOL(snd_timer_close); 2081 EXPORT_SYMBOL(snd_timer_resolution); 2082 EXPORT_SYMBOL(snd_timer_start); 2083 EXPORT_SYMBOL(snd_timer_stop); 2084 EXPORT_SYMBOL(snd_timer_continue); 2085 EXPORT_SYMBOL(snd_timer_pause); 2086 EXPORT_SYMBOL(snd_timer_new); 2087 EXPORT_SYMBOL(snd_timer_notify); 2088 EXPORT_SYMBOL(snd_timer_global_new); 2089 EXPORT_SYMBOL(snd_timer_global_free); 2090 EXPORT_SYMBOL(snd_timer_global_register); 2091 EXPORT_SYMBOL(snd_timer_interrupt); 2092