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 <linux/sched/signal.h> 31 #include <sound/core.h> 32 #include <sound/timer.h> 33 #include <sound/control.h> 34 #include <sound/info.h> 35 #include <sound/minors.h> 36 #include <sound/initval.h> 37 #include <linux/kmod.h> 38 39 /* internal flags */ 40 #define SNDRV_TIMER_IFLG_PAUSED 0x00010000 41 42 #if IS_ENABLED(CONFIG_SND_HRTIMER) 43 #define DEFAULT_TIMER_LIMIT 4 44 #else 45 #define DEFAULT_TIMER_LIMIT 1 46 #endif 47 48 static int timer_limit = DEFAULT_TIMER_LIMIT; 49 static int timer_tstamp_monotonic = 1; 50 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 51 MODULE_DESCRIPTION("ALSA timer interface"); 52 MODULE_LICENSE("GPL"); 53 module_param(timer_limit, int, 0444); 54 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 55 module_param(timer_tstamp_monotonic, int, 0444); 56 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 57 58 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 59 MODULE_ALIAS("devname:snd/timer"); 60 61 struct snd_timer_user { 62 struct snd_timer_instance *timeri; 63 int tread; /* enhanced read with timestamps and events */ 64 unsigned long ticks; 65 unsigned long overrun; 66 int qhead; 67 int qtail; 68 int qused; 69 int queue_size; 70 bool disconnected; 71 struct snd_timer_read *queue; 72 struct snd_timer_tread *tqueue; 73 spinlock_t qlock; 74 unsigned long last_resolution; 75 unsigned int filter; 76 struct timespec tstamp; /* trigger tstamp */ 77 wait_queue_head_t qchange_sleep; 78 struct fasync_struct *fasync; 79 struct mutex ioctl_lock; 80 }; 81 82 /* list of timers */ 83 static LIST_HEAD(snd_timer_list); 84 85 /* list of slave instances */ 86 static LIST_HEAD(snd_timer_slave_list); 87 88 /* lock for slave active lists */ 89 static DEFINE_SPINLOCK(slave_active_lock); 90 91 static DEFINE_MUTEX(register_mutex); 92 93 static int snd_timer_free(struct snd_timer *timer); 94 static int snd_timer_dev_free(struct snd_device *device); 95 static int snd_timer_dev_register(struct snd_device *device); 96 static int snd_timer_dev_disconnect(struct snd_device *device); 97 98 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 99 100 /* 101 * create a timer instance with the given owner string. 102 * when timer is not NULL, increments the module counter 103 */ 104 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 105 struct snd_timer *timer) 106 { 107 struct snd_timer_instance *timeri; 108 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 109 if (timeri == NULL) 110 return NULL; 111 timeri->owner = kstrdup(owner, GFP_KERNEL); 112 if (! timeri->owner) { 113 kfree(timeri); 114 return NULL; 115 } 116 INIT_LIST_HEAD(&timeri->open_list); 117 INIT_LIST_HEAD(&timeri->active_list); 118 INIT_LIST_HEAD(&timeri->ack_list); 119 INIT_LIST_HEAD(&timeri->slave_list_head); 120 INIT_LIST_HEAD(&timeri->slave_active_head); 121 122 timeri->timer = timer; 123 if (timer && !try_module_get(timer->module)) { 124 kfree(timeri->owner); 125 kfree(timeri); 126 return NULL; 127 } 128 129 return timeri; 130 } 131 132 /* 133 * find a timer instance from the given timer id 134 */ 135 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 136 { 137 struct snd_timer *timer = NULL; 138 139 list_for_each_entry(timer, &snd_timer_list, device_list) { 140 if (timer->tmr_class != tid->dev_class) 141 continue; 142 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 143 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 144 (timer->card == NULL || 145 timer->card->number != tid->card)) 146 continue; 147 if (timer->tmr_device != tid->device) 148 continue; 149 if (timer->tmr_subdevice != tid->subdevice) 150 continue; 151 return timer; 152 } 153 return NULL; 154 } 155 156 #ifdef CONFIG_MODULES 157 158 static void snd_timer_request(struct snd_timer_id *tid) 159 { 160 switch (tid->dev_class) { 161 case SNDRV_TIMER_CLASS_GLOBAL: 162 if (tid->device < timer_limit) 163 request_module("snd-timer-%i", tid->device); 164 break; 165 case SNDRV_TIMER_CLASS_CARD: 166 case SNDRV_TIMER_CLASS_PCM: 167 if (tid->card < snd_ecards_limit) 168 request_module("snd-card-%i", tid->card); 169 break; 170 default: 171 break; 172 } 173 } 174 175 #endif 176 177 /* 178 * look for a master instance matching with the slave id of the given slave. 179 * when found, relink the open_link of the slave. 180 * 181 * call this with register_mutex down. 182 */ 183 static int snd_timer_check_slave(struct snd_timer_instance *slave) 184 { 185 struct snd_timer *timer; 186 struct snd_timer_instance *master; 187 188 /* FIXME: it's really dumb to look up all entries.. */ 189 list_for_each_entry(timer, &snd_timer_list, device_list) { 190 list_for_each_entry(master, &timer->open_list_head, open_list) { 191 if (slave->slave_class == master->slave_class && 192 slave->slave_id == master->slave_id) { 193 if (master->timer->num_instances >= 194 master->timer->max_instances) 195 return -EBUSY; 196 list_move_tail(&slave->open_list, 197 &master->slave_list_head); 198 master->timer->num_instances++; 199 spin_lock_irq(&slave_active_lock); 200 slave->master = master; 201 slave->timer = master->timer; 202 spin_unlock_irq(&slave_active_lock); 203 return 0; 204 } 205 } 206 } 207 return 0; 208 } 209 210 /* 211 * look for slave instances matching with the slave id of the given master. 212 * when found, relink the open_link of slaves. 213 * 214 * call this with register_mutex down. 215 */ 216 static int snd_timer_check_master(struct snd_timer_instance *master) 217 { 218 struct snd_timer_instance *slave, *tmp; 219 220 /* check all pending slaves */ 221 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 222 if (slave->slave_class == master->slave_class && 223 slave->slave_id == master->slave_id) { 224 if (master->timer->num_instances >= 225 master->timer->max_instances) 226 return -EBUSY; 227 list_move_tail(&slave->open_list, &master->slave_list_head); 228 master->timer->num_instances++; 229 spin_lock_irq(&slave_active_lock); 230 spin_lock(&master->timer->lock); 231 slave->master = master; 232 slave->timer = master->timer; 233 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 234 list_add_tail(&slave->active_list, 235 &master->slave_active_head); 236 spin_unlock(&master->timer->lock); 237 spin_unlock_irq(&slave_active_lock); 238 } 239 } 240 return 0; 241 } 242 243 static int snd_timer_close_locked(struct snd_timer_instance *timeri); 244 245 /* 246 * open a timer instance 247 * when opening a master, the slave id must be here given. 248 */ 249 int snd_timer_open(struct snd_timer_instance **ti, 250 char *owner, struct snd_timer_id *tid, 251 unsigned int slave_id) 252 { 253 struct snd_timer *timer; 254 struct snd_timer_instance *timeri = NULL; 255 int err; 256 257 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 258 /* open a slave instance */ 259 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 260 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 261 pr_debug("ALSA: timer: invalid slave class %i\n", 262 tid->dev_sclass); 263 return -EINVAL; 264 } 265 mutex_lock(®ister_mutex); 266 timeri = snd_timer_instance_new(owner, NULL); 267 if (!timeri) { 268 mutex_unlock(®ister_mutex); 269 return -ENOMEM; 270 } 271 timeri->slave_class = tid->dev_sclass; 272 timeri->slave_id = tid->device; 273 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 274 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 275 err = snd_timer_check_slave(timeri); 276 if (err < 0) { 277 snd_timer_close_locked(timeri); 278 timeri = NULL; 279 } 280 mutex_unlock(®ister_mutex); 281 *ti = timeri; 282 return err; 283 } 284 285 /* open a master instance */ 286 mutex_lock(®ister_mutex); 287 timer = snd_timer_find(tid); 288 #ifdef CONFIG_MODULES 289 if (!timer) { 290 mutex_unlock(®ister_mutex); 291 snd_timer_request(tid); 292 mutex_lock(®ister_mutex); 293 timer = snd_timer_find(tid); 294 } 295 #endif 296 if (!timer) { 297 mutex_unlock(®ister_mutex); 298 return -ENODEV; 299 } 300 if (!list_empty(&timer->open_list_head)) { 301 timeri = list_entry(timer->open_list_head.next, 302 struct snd_timer_instance, open_list); 303 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 304 mutex_unlock(®ister_mutex); 305 return -EBUSY; 306 } 307 } 308 if (timer->num_instances >= timer->max_instances) { 309 mutex_unlock(®ister_mutex); 310 return -EBUSY; 311 } 312 timeri = snd_timer_instance_new(owner, timer); 313 if (!timeri) { 314 mutex_unlock(®ister_mutex); 315 return -ENOMEM; 316 } 317 /* take a card refcount for safe disconnection */ 318 if (timer->card) 319 get_device(&timer->card->card_dev); 320 timeri->slave_class = tid->dev_sclass; 321 timeri->slave_id = slave_id; 322 323 if (list_empty(&timer->open_list_head) && timer->hw.open) { 324 int err = timer->hw.open(timer); 325 if (err) { 326 kfree(timeri->owner); 327 kfree(timeri); 328 329 if (timer->card) 330 put_device(&timer->card->card_dev); 331 module_put(timer->module); 332 mutex_unlock(®ister_mutex); 333 return err; 334 } 335 } 336 337 list_add_tail(&timeri->open_list, &timer->open_list_head); 338 timer->num_instances++; 339 err = snd_timer_check_master(timeri); 340 if (err < 0) { 341 snd_timer_close_locked(timeri); 342 timeri = NULL; 343 } 344 mutex_unlock(®ister_mutex); 345 *ti = timeri; 346 return err; 347 } 348 EXPORT_SYMBOL(snd_timer_open); 349 350 /* 351 * close a timer instance 352 * call this with register_mutex down. 353 */ 354 static int snd_timer_close_locked(struct snd_timer_instance *timeri) 355 { 356 struct snd_timer *timer = NULL; 357 struct snd_timer_instance *slave, *tmp; 358 359 list_del(&timeri->open_list); 360 361 /* force to stop the timer */ 362 snd_timer_stop(timeri); 363 364 timer = timeri->timer; 365 if (timer) { 366 timer->num_instances--; 367 /* wait, until the active callback is finished */ 368 spin_lock_irq(&timer->lock); 369 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 370 spin_unlock_irq(&timer->lock); 371 udelay(10); 372 spin_lock_irq(&timer->lock); 373 } 374 spin_unlock_irq(&timer->lock); 375 376 /* remove slave links */ 377 spin_lock_irq(&slave_active_lock); 378 spin_lock(&timer->lock); 379 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 380 open_list) { 381 list_move_tail(&slave->open_list, &snd_timer_slave_list); 382 timer->num_instances--; 383 slave->master = NULL; 384 slave->timer = NULL; 385 list_del_init(&slave->ack_list); 386 list_del_init(&slave->active_list); 387 } 388 spin_unlock(&timer->lock); 389 spin_unlock_irq(&slave_active_lock); 390 391 /* slave doesn't need to release timer resources below */ 392 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 393 timer = NULL; 394 } 395 396 if (timeri->private_free) 397 timeri->private_free(timeri); 398 kfree(timeri->owner); 399 kfree(timeri); 400 401 if (timer) { 402 if (list_empty(&timer->open_list_head) && timer->hw.close) 403 timer->hw.close(timer); 404 /* release a card refcount for safe disconnection */ 405 if (timer->card) 406 put_device(&timer->card->card_dev); 407 module_put(timer->module); 408 } 409 410 return 0; 411 } 412 413 /* 414 * close a timer instance 415 */ 416 int snd_timer_close(struct snd_timer_instance *timeri) 417 { 418 int err; 419 420 if (snd_BUG_ON(!timeri)) 421 return -ENXIO; 422 423 mutex_lock(®ister_mutex); 424 err = snd_timer_close_locked(timeri); 425 mutex_unlock(®ister_mutex); 426 return err; 427 } 428 EXPORT_SYMBOL(snd_timer_close); 429 430 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer) 431 { 432 if (timer->hw.c_resolution) 433 return timer->hw.c_resolution(timer); 434 else 435 return timer->hw.resolution; 436 } 437 438 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 439 { 440 struct snd_timer * timer; 441 unsigned long ret = 0; 442 unsigned long flags; 443 444 if (timeri == NULL) 445 return 0; 446 timer = timeri->timer; 447 if (timer) { 448 spin_lock_irqsave(&timer->lock, flags); 449 ret = snd_timer_hw_resolution(timer); 450 spin_unlock_irqrestore(&timer->lock, flags); 451 } 452 return ret; 453 } 454 EXPORT_SYMBOL(snd_timer_resolution); 455 456 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 457 { 458 struct snd_timer *timer = ti->timer; 459 unsigned long resolution = 0; 460 struct snd_timer_instance *ts; 461 struct timespec tstamp; 462 463 if (timer_tstamp_monotonic) 464 ktime_get_ts(&tstamp); 465 else 466 getnstimeofday(&tstamp); 467 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 468 event > SNDRV_TIMER_EVENT_PAUSE)) 469 return; 470 if (timer && 471 (event == SNDRV_TIMER_EVENT_START || 472 event == SNDRV_TIMER_EVENT_CONTINUE)) 473 resolution = snd_timer_hw_resolution(timer); 474 if (ti->ccallback) 475 ti->ccallback(ti, event, &tstamp, resolution); 476 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 477 return; 478 if (timer == NULL) 479 return; 480 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 481 return; 482 list_for_each_entry(ts, &ti->slave_active_head, active_list) 483 if (ts->ccallback) 484 ts->ccallback(ts, event + 100, &tstamp, resolution); 485 } 486 487 /* start/continue a master timer */ 488 static int snd_timer_start1(struct snd_timer_instance *timeri, 489 bool start, unsigned long ticks) 490 { 491 struct snd_timer *timer; 492 int result; 493 unsigned long flags; 494 495 timer = timeri->timer; 496 if (!timer) 497 return -EINVAL; 498 499 spin_lock_irqsave(&timer->lock, flags); 500 if (timer->card && timer->card->shutdown) { 501 result = -ENODEV; 502 goto unlock; 503 } 504 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 505 SNDRV_TIMER_IFLG_START)) { 506 result = -EBUSY; 507 goto unlock; 508 } 509 510 if (start) 511 timeri->ticks = timeri->cticks = ticks; 512 else if (!timeri->cticks) 513 timeri->cticks = 1; 514 timeri->pticks = 0; 515 516 list_move_tail(&timeri->active_list, &timer->active_list_head); 517 if (timer->running) { 518 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 519 goto __start_now; 520 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 521 timeri->flags |= SNDRV_TIMER_IFLG_START; 522 result = 1; /* delayed start */ 523 } else { 524 if (start) 525 timer->sticks = ticks; 526 timer->hw.start(timer); 527 __start_now: 528 timer->running++; 529 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 530 result = 0; 531 } 532 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 533 SNDRV_TIMER_EVENT_CONTINUE); 534 unlock: 535 spin_unlock_irqrestore(&timer->lock, flags); 536 return result; 537 } 538 539 /* start/continue a slave timer */ 540 static int snd_timer_start_slave(struct snd_timer_instance *timeri, 541 bool start) 542 { 543 unsigned long flags; 544 545 spin_lock_irqsave(&slave_active_lock, flags); 546 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 547 spin_unlock_irqrestore(&slave_active_lock, flags); 548 return -EBUSY; 549 } 550 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 551 if (timeri->master && timeri->timer) { 552 spin_lock(&timeri->timer->lock); 553 list_add_tail(&timeri->active_list, 554 &timeri->master->slave_active_head); 555 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 556 SNDRV_TIMER_EVENT_CONTINUE); 557 spin_unlock(&timeri->timer->lock); 558 } 559 spin_unlock_irqrestore(&slave_active_lock, flags); 560 return 1; /* delayed start */ 561 } 562 563 /* stop/pause a master timer */ 564 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) 565 { 566 struct snd_timer *timer; 567 int result = 0; 568 unsigned long flags; 569 570 timer = timeri->timer; 571 if (!timer) 572 return -EINVAL; 573 spin_lock_irqsave(&timer->lock, flags); 574 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 575 SNDRV_TIMER_IFLG_START))) { 576 result = -EBUSY; 577 goto unlock; 578 } 579 list_del_init(&timeri->ack_list); 580 list_del_init(&timeri->active_list); 581 if (timer->card && timer->card->shutdown) 582 goto unlock; 583 if (stop) { 584 timeri->cticks = timeri->ticks; 585 timeri->pticks = 0; 586 } 587 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 588 !(--timer->running)) { 589 timer->hw.stop(timer); 590 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 591 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 592 snd_timer_reschedule(timer, 0); 593 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 594 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 595 timer->hw.start(timer); 596 } 597 } 598 } 599 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 600 if (stop) 601 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED; 602 else 603 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED; 604 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 605 SNDRV_TIMER_EVENT_PAUSE); 606 unlock: 607 spin_unlock_irqrestore(&timer->lock, flags); 608 return result; 609 } 610 611 /* stop/pause a slave timer */ 612 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) 613 { 614 unsigned long flags; 615 616 spin_lock_irqsave(&slave_active_lock, flags); 617 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) { 618 spin_unlock_irqrestore(&slave_active_lock, flags); 619 return -EBUSY; 620 } 621 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 622 if (timeri->timer) { 623 spin_lock(&timeri->timer->lock); 624 list_del_init(&timeri->ack_list); 625 list_del_init(&timeri->active_list); 626 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 627 SNDRV_TIMER_EVENT_PAUSE); 628 spin_unlock(&timeri->timer->lock); 629 } 630 spin_unlock_irqrestore(&slave_active_lock, flags); 631 return 0; 632 } 633 634 /* 635 * start the timer instance 636 */ 637 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 638 { 639 if (timeri == NULL || ticks < 1) 640 return -EINVAL; 641 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 642 return snd_timer_start_slave(timeri, true); 643 else 644 return snd_timer_start1(timeri, true, ticks); 645 } 646 EXPORT_SYMBOL(snd_timer_start); 647 648 /* 649 * stop the timer instance. 650 * 651 * do not call this from the timer callback! 652 */ 653 int snd_timer_stop(struct snd_timer_instance *timeri) 654 { 655 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 656 return snd_timer_stop_slave(timeri, true); 657 else 658 return snd_timer_stop1(timeri, true); 659 } 660 EXPORT_SYMBOL(snd_timer_stop); 661 662 /* 663 * start again.. the tick is kept. 664 */ 665 int snd_timer_continue(struct snd_timer_instance *timeri) 666 { 667 /* timer can continue only after pause */ 668 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) 669 return -EINVAL; 670 671 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 672 return snd_timer_start_slave(timeri, false); 673 else 674 return snd_timer_start1(timeri, false, 0); 675 } 676 EXPORT_SYMBOL(snd_timer_continue); 677 678 /* 679 * pause.. remember the ticks left 680 */ 681 int snd_timer_pause(struct snd_timer_instance * timeri) 682 { 683 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 684 return snd_timer_stop_slave(timeri, false); 685 else 686 return snd_timer_stop1(timeri, false); 687 } 688 EXPORT_SYMBOL(snd_timer_pause); 689 690 /* 691 * reschedule the timer 692 * 693 * start pending instances and check the scheduling ticks. 694 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 695 */ 696 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 697 { 698 struct snd_timer_instance *ti; 699 unsigned long ticks = ~0UL; 700 701 list_for_each_entry(ti, &timer->active_list_head, active_list) { 702 if (ti->flags & SNDRV_TIMER_IFLG_START) { 703 ti->flags &= ~SNDRV_TIMER_IFLG_START; 704 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 705 timer->running++; 706 } 707 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 708 if (ticks > ti->cticks) 709 ticks = ti->cticks; 710 } 711 } 712 if (ticks == ~0UL) { 713 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 714 return; 715 } 716 if (ticks > timer->hw.ticks) 717 ticks = timer->hw.ticks; 718 if (ticks_left != ticks) 719 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 720 timer->sticks = ticks; 721 } 722 723 /* 724 * timer tasklet 725 * 726 */ 727 static void snd_timer_tasklet(unsigned long arg) 728 { 729 struct snd_timer *timer = (struct snd_timer *) arg; 730 struct snd_timer_instance *ti; 731 struct list_head *p; 732 unsigned long resolution, ticks; 733 unsigned long flags; 734 735 if (timer->card && timer->card->shutdown) 736 return; 737 738 spin_lock_irqsave(&timer->lock, flags); 739 /* now process all callbacks */ 740 while (!list_empty(&timer->sack_list_head)) { 741 p = timer->sack_list_head.next; /* get first item */ 742 ti = list_entry(p, struct snd_timer_instance, ack_list); 743 744 /* remove from ack_list and make empty */ 745 list_del_init(p); 746 747 ticks = ti->pticks; 748 ti->pticks = 0; 749 resolution = ti->resolution; 750 751 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 752 spin_unlock(&timer->lock); 753 if (ti->callback) 754 ti->callback(ti, resolution, ticks); 755 spin_lock(&timer->lock); 756 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 757 } 758 spin_unlock_irqrestore(&timer->lock, flags); 759 } 760 761 /* 762 * timer interrupt 763 * 764 * ticks_left is usually equal to timer->sticks. 765 * 766 */ 767 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 768 { 769 struct snd_timer_instance *ti, *ts, *tmp; 770 unsigned long resolution, ticks; 771 struct list_head *p, *ack_list_head; 772 unsigned long flags; 773 int use_tasklet = 0; 774 775 if (timer == NULL) 776 return; 777 778 if (timer->card && timer->card->shutdown) 779 return; 780 781 spin_lock_irqsave(&timer->lock, flags); 782 783 /* remember the current resolution */ 784 resolution = snd_timer_hw_resolution(timer); 785 786 /* loop for all active instances 787 * Here we cannot use list_for_each_entry because the active_list of a 788 * processed instance is relinked to done_list_head before the callback 789 * is called. 790 */ 791 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 792 active_list) { 793 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 794 continue; 795 ti->pticks += ticks_left; 796 ti->resolution = resolution; 797 if (ti->cticks < ticks_left) 798 ti->cticks = 0; 799 else 800 ti->cticks -= ticks_left; 801 if (ti->cticks) /* not expired */ 802 continue; 803 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 804 ti->cticks = ti->ticks; 805 } else { 806 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 807 --timer->running; 808 list_del_init(&ti->active_list); 809 } 810 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 811 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 812 ack_list_head = &timer->ack_list_head; 813 else 814 ack_list_head = &timer->sack_list_head; 815 if (list_empty(&ti->ack_list)) 816 list_add_tail(&ti->ack_list, ack_list_head); 817 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 818 ts->pticks = ti->pticks; 819 ts->resolution = resolution; 820 if (list_empty(&ts->ack_list)) 821 list_add_tail(&ts->ack_list, ack_list_head); 822 } 823 } 824 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 825 snd_timer_reschedule(timer, timer->sticks); 826 if (timer->running) { 827 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 828 timer->hw.stop(timer); 829 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 830 } 831 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 832 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 833 /* restart timer */ 834 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 835 timer->hw.start(timer); 836 } 837 } else { 838 timer->hw.stop(timer); 839 } 840 841 /* now process all fast callbacks */ 842 while (!list_empty(&timer->ack_list_head)) { 843 p = timer->ack_list_head.next; /* get first item */ 844 ti = list_entry(p, struct snd_timer_instance, ack_list); 845 846 /* remove from ack_list and make empty */ 847 list_del_init(p); 848 849 ticks = ti->pticks; 850 ti->pticks = 0; 851 852 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 853 spin_unlock(&timer->lock); 854 if (ti->callback) 855 ti->callback(ti, resolution, ticks); 856 spin_lock(&timer->lock); 857 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 858 } 859 860 /* do we have any slow callbacks? */ 861 use_tasklet = !list_empty(&timer->sack_list_head); 862 spin_unlock_irqrestore(&timer->lock, flags); 863 864 if (use_tasklet) 865 tasklet_schedule(&timer->task_queue); 866 } 867 EXPORT_SYMBOL(snd_timer_interrupt); 868 869 /* 870 871 */ 872 873 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 874 struct snd_timer **rtimer) 875 { 876 struct snd_timer *timer; 877 int err; 878 static struct snd_device_ops ops = { 879 .dev_free = snd_timer_dev_free, 880 .dev_register = snd_timer_dev_register, 881 .dev_disconnect = snd_timer_dev_disconnect, 882 }; 883 884 if (snd_BUG_ON(!tid)) 885 return -EINVAL; 886 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD || 887 tid->dev_class == SNDRV_TIMER_CLASS_PCM) { 888 if (WARN_ON(!card)) 889 return -EINVAL; 890 } 891 if (rtimer) 892 *rtimer = NULL; 893 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 894 if (!timer) 895 return -ENOMEM; 896 timer->tmr_class = tid->dev_class; 897 timer->card = card; 898 timer->tmr_device = tid->device; 899 timer->tmr_subdevice = tid->subdevice; 900 if (id) 901 strlcpy(timer->id, id, sizeof(timer->id)); 902 timer->sticks = 1; 903 INIT_LIST_HEAD(&timer->device_list); 904 INIT_LIST_HEAD(&timer->open_list_head); 905 INIT_LIST_HEAD(&timer->active_list_head); 906 INIT_LIST_HEAD(&timer->ack_list_head); 907 INIT_LIST_HEAD(&timer->sack_list_head); 908 spin_lock_init(&timer->lock); 909 tasklet_init(&timer->task_queue, snd_timer_tasklet, 910 (unsigned long)timer); 911 timer->max_instances = 1000; /* default limit per timer */ 912 if (card != NULL) { 913 timer->module = card->module; 914 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 915 if (err < 0) { 916 snd_timer_free(timer); 917 return err; 918 } 919 } 920 if (rtimer) 921 *rtimer = timer; 922 return 0; 923 } 924 EXPORT_SYMBOL(snd_timer_new); 925 926 static int snd_timer_free(struct snd_timer *timer) 927 { 928 if (!timer) 929 return 0; 930 931 mutex_lock(®ister_mutex); 932 if (! list_empty(&timer->open_list_head)) { 933 struct list_head *p, *n; 934 struct snd_timer_instance *ti; 935 pr_warn("ALSA: timer %p is busy?\n", timer); 936 list_for_each_safe(p, n, &timer->open_list_head) { 937 list_del_init(p); 938 ti = list_entry(p, struct snd_timer_instance, open_list); 939 ti->timer = NULL; 940 } 941 } 942 list_del(&timer->device_list); 943 mutex_unlock(®ister_mutex); 944 945 if (timer->private_free) 946 timer->private_free(timer); 947 kfree(timer); 948 return 0; 949 } 950 951 static int snd_timer_dev_free(struct snd_device *device) 952 { 953 struct snd_timer *timer = device->device_data; 954 return snd_timer_free(timer); 955 } 956 957 static int snd_timer_dev_register(struct snd_device *dev) 958 { 959 struct snd_timer *timer = dev->device_data; 960 struct snd_timer *timer1; 961 962 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 963 return -ENXIO; 964 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 965 !timer->hw.resolution && timer->hw.c_resolution == NULL) 966 return -EINVAL; 967 968 mutex_lock(®ister_mutex); 969 list_for_each_entry(timer1, &snd_timer_list, device_list) { 970 if (timer1->tmr_class > timer->tmr_class) 971 break; 972 if (timer1->tmr_class < timer->tmr_class) 973 continue; 974 if (timer1->card && timer->card) { 975 if (timer1->card->number > timer->card->number) 976 break; 977 if (timer1->card->number < timer->card->number) 978 continue; 979 } 980 if (timer1->tmr_device > timer->tmr_device) 981 break; 982 if (timer1->tmr_device < timer->tmr_device) 983 continue; 984 if (timer1->tmr_subdevice > timer->tmr_subdevice) 985 break; 986 if (timer1->tmr_subdevice < timer->tmr_subdevice) 987 continue; 988 /* conflicts.. */ 989 mutex_unlock(®ister_mutex); 990 return -EBUSY; 991 } 992 list_add_tail(&timer->device_list, &timer1->device_list); 993 mutex_unlock(®ister_mutex); 994 return 0; 995 } 996 997 static int snd_timer_dev_disconnect(struct snd_device *device) 998 { 999 struct snd_timer *timer = device->device_data; 1000 struct snd_timer_instance *ti; 1001 1002 mutex_lock(®ister_mutex); 1003 list_del_init(&timer->device_list); 1004 /* wake up pending sleepers */ 1005 list_for_each_entry(ti, &timer->open_list_head, open_list) { 1006 if (ti->disconnect) 1007 ti->disconnect(ti); 1008 } 1009 mutex_unlock(®ister_mutex); 1010 return 0; 1011 } 1012 1013 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 1014 { 1015 unsigned long flags; 1016 unsigned long resolution = 0; 1017 struct snd_timer_instance *ti, *ts; 1018 1019 if (timer->card && timer->card->shutdown) 1020 return; 1021 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 1022 return; 1023 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 1024 event > SNDRV_TIMER_EVENT_MRESUME)) 1025 return; 1026 spin_lock_irqsave(&timer->lock, flags); 1027 if (event == SNDRV_TIMER_EVENT_MSTART || 1028 event == SNDRV_TIMER_EVENT_MCONTINUE || 1029 event == SNDRV_TIMER_EVENT_MRESUME) 1030 resolution = snd_timer_hw_resolution(timer); 1031 list_for_each_entry(ti, &timer->active_list_head, active_list) { 1032 if (ti->ccallback) 1033 ti->ccallback(ti, event, tstamp, resolution); 1034 list_for_each_entry(ts, &ti->slave_active_head, active_list) 1035 if (ts->ccallback) 1036 ts->ccallback(ts, event, tstamp, resolution); 1037 } 1038 spin_unlock_irqrestore(&timer->lock, flags); 1039 } 1040 EXPORT_SYMBOL(snd_timer_notify); 1041 1042 /* 1043 * exported functions for global timers 1044 */ 1045 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 1046 { 1047 struct snd_timer_id tid; 1048 1049 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 1050 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1051 tid.card = -1; 1052 tid.device = device; 1053 tid.subdevice = 0; 1054 return snd_timer_new(NULL, id, &tid, rtimer); 1055 } 1056 EXPORT_SYMBOL(snd_timer_global_new); 1057 1058 int snd_timer_global_free(struct snd_timer *timer) 1059 { 1060 return snd_timer_free(timer); 1061 } 1062 EXPORT_SYMBOL(snd_timer_global_free); 1063 1064 int snd_timer_global_register(struct snd_timer *timer) 1065 { 1066 struct snd_device dev; 1067 1068 memset(&dev, 0, sizeof(dev)); 1069 dev.device_data = timer; 1070 return snd_timer_dev_register(&dev); 1071 } 1072 EXPORT_SYMBOL(snd_timer_global_register); 1073 1074 /* 1075 * System timer 1076 */ 1077 1078 struct snd_timer_system_private { 1079 struct timer_list tlist; 1080 struct snd_timer *snd_timer; 1081 unsigned long last_expires; 1082 unsigned long last_jiffies; 1083 unsigned long correction; 1084 }; 1085 1086 static void snd_timer_s_function(struct timer_list *t) 1087 { 1088 struct snd_timer_system_private *priv = from_timer(priv, t, 1089 tlist); 1090 struct snd_timer *timer = priv->snd_timer; 1091 unsigned long jiff = jiffies; 1092 if (time_after(jiff, priv->last_expires)) 1093 priv->correction += (long)jiff - (long)priv->last_expires; 1094 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1095 } 1096 1097 static int snd_timer_s_start(struct snd_timer * timer) 1098 { 1099 struct snd_timer_system_private *priv; 1100 unsigned long njiff; 1101 1102 priv = (struct snd_timer_system_private *) timer->private_data; 1103 njiff = (priv->last_jiffies = jiffies); 1104 if (priv->correction > timer->sticks - 1) { 1105 priv->correction -= timer->sticks - 1; 1106 njiff++; 1107 } else { 1108 njiff += timer->sticks - priv->correction; 1109 priv->correction = 0; 1110 } 1111 priv->last_expires = njiff; 1112 mod_timer(&priv->tlist, njiff); 1113 return 0; 1114 } 1115 1116 static int snd_timer_s_stop(struct snd_timer * timer) 1117 { 1118 struct snd_timer_system_private *priv; 1119 unsigned long jiff; 1120 1121 priv = (struct snd_timer_system_private *) timer->private_data; 1122 del_timer(&priv->tlist); 1123 jiff = jiffies; 1124 if (time_before(jiff, priv->last_expires)) 1125 timer->sticks = priv->last_expires - jiff; 1126 else 1127 timer->sticks = 1; 1128 priv->correction = 0; 1129 return 0; 1130 } 1131 1132 static int snd_timer_s_close(struct snd_timer *timer) 1133 { 1134 struct snd_timer_system_private *priv; 1135 1136 priv = (struct snd_timer_system_private *)timer->private_data; 1137 del_timer_sync(&priv->tlist); 1138 return 0; 1139 } 1140 1141 static struct snd_timer_hardware snd_timer_system = 1142 { 1143 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1144 .resolution = 1000000000L / HZ, 1145 .ticks = 10000000L, 1146 .close = snd_timer_s_close, 1147 .start = snd_timer_s_start, 1148 .stop = snd_timer_s_stop 1149 }; 1150 1151 static void snd_timer_free_system(struct snd_timer *timer) 1152 { 1153 kfree(timer->private_data); 1154 } 1155 1156 static int snd_timer_register_system(void) 1157 { 1158 struct snd_timer *timer; 1159 struct snd_timer_system_private *priv; 1160 int err; 1161 1162 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1163 if (err < 0) 1164 return err; 1165 strcpy(timer->name, "system timer"); 1166 timer->hw = snd_timer_system; 1167 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1168 if (priv == NULL) { 1169 snd_timer_free(timer); 1170 return -ENOMEM; 1171 } 1172 priv->snd_timer = timer; 1173 timer_setup(&priv->tlist, snd_timer_s_function, 0); 1174 timer->private_data = priv; 1175 timer->private_free = snd_timer_free_system; 1176 return snd_timer_global_register(timer); 1177 } 1178 1179 #ifdef CONFIG_SND_PROC_FS 1180 /* 1181 * Info interface 1182 */ 1183 1184 static void snd_timer_proc_read(struct snd_info_entry *entry, 1185 struct snd_info_buffer *buffer) 1186 { 1187 struct snd_timer *timer; 1188 struct snd_timer_instance *ti; 1189 1190 mutex_lock(®ister_mutex); 1191 list_for_each_entry(timer, &snd_timer_list, device_list) { 1192 if (timer->card && timer->card->shutdown) 1193 continue; 1194 switch (timer->tmr_class) { 1195 case SNDRV_TIMER_CLASS_GLOBAL: 1196 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1197 break; 1198 case SNDRV_TIMER_CLASS_CARD: 1199 snd_iprintf(buffer, "C%i-%i: ", 1200 timer->card->number, timer->tmr_device); 1201 break; 1202 case SNDRV_TIMER_CLASS_PCM: 1203 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1204 timer->tmr_device, timer->tmr_subdevice); 1205 break; 1206 default: 1207 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1208 timer->card ? timer->card->number : -1, 1209 timer->tmr_device, timer->tmr_subdevice); 1210 } 1211 snd_iprintf(buffer, "%s :", timer->name); 1212 if (timer->hw.resolution) 1213 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1214 timer->hw.resolution / 1000, 1215 timer->hw.resolution % 1000, 1216 timer->hw.ticks); 1217 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1218 snd_iprintf(buffer, " SLAVE"); 1219 snd_iprintf(buffer, "\n"); 1220 list_for_each_entry(ti, &timer->open_list_head, open_list) 1221 snd_iprintf(buffer, " Client %s : %s\n", 1222 ti->owner ? ti->owner : "unknown", 1223 ti->flags & (SNDRV_TIMER_IFLG_START | 1224 SNDRV_TIMER_IFLG_RUNNING) 1225 ? "running" : "stopped"); 1226 } 1227 mutex_unlock(®ister_mutex); 1228 } 1229 1230 static struct snd_info_entry *snd_timer_proc_entry; 1231 1232 static void __init snd_timer_proc_init(void) 1233 { 1234 struct snd_info_entry *entry; 1235 1236 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1237 if (entry != NULL) { 1238 entry->c.text.read = snd_timer_proc_read; 1239 if (snd_info_register(entry) < 0) { 1240 snd_info_free_entry(entry); 1241 entry = NULL; 1242 } 1243 } 1244 snd_timer_proc_entry = entry; 1245 } 1246 1247 static void __exit snd_timer_proc_done(void) 1248 { 1249 snd_info_free_entry(snd_timer_proc_entry); 1250 } 1251 #else /* !CONFIG_SND_PROC_FS */ 1252 #define snd_timer_proc_init() 1253 #define snd_timer_proc_done() 1254 #endif 1255 1256 /* 1257 * USER SPACE interface 1258 */ 1259 1260 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1261 unsigned long resolution, 1262 unsigned long ticks) 1263 { 1264 struct snd_timer_user *tu = timeri->callback_data; 1265 struct snd_timer_read *r; 1266 int prev; 1267 1268 spin_lock(&tu->qlock); 1269 if (tu->qused > 0) { 1270 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1271 r = &tu->queue[prev]; 1272 if (r->resolution == resolution) { 1273 r->ticks += ticks; 1274 goto __wake; 1275 } 1276 } 1277 if (tu->qused >= tu->queue_size) { 1278 tu->overrun++; 1279 } else { 1280 r = &tu->queue[tu->qtail++]; 1281 tu->qtail %= tu->queue_size; 1282 r->resolution = resolution; 1283 r->ticks = ticks; 1284 tu->qused++; 1285 } 1286 __wake: 1287 spin_unlock(&tu->qlock); 1288 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1289 wake_up(&tu->qchange_sleep); 1290 } 1291 1292 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1293 struct snd_timer_tread *tread) 1294 { 1295 if (tu->qused >= tu->queue_size) { 1296 tu->overrun++; 1297 } else { 1298 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1299 tu->qtail %= tu->queue_size; 1300 tu->qused++; 1301 } 1302 } 1303 1304 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1305 int event, 1306 struct timespec *tstamp, 1307 unsigned long resolution) 1308 { 1309 struct snd_timer_user *tu = timeri->callback_data; 1310 struct snd_timer_tread r1; 1311 unsigned long flags; 1312 1313 if (event >= SNDRV_TIMER_EVENT_START && 1314 event <= SNDRV_TIMER_EVENT_PAUSE) 1315 tu->tstamp = *tstamp; 1316 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1317 return; 1318 memset(&r1, 0, sizeof(r1)); 1319 r1.event = event; 1320 r1.tstamp = *tstamp; 1321 r1.val = resolution; 1322 spin_lock_irqsave(&tu->qlock, flags); 1323 snd_timer_user_append_to_tqueue(tu, &r1); 1324 spin_unlock_irqrestore(&tu->qlock, flags); 1325 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1326 wake_up(&tu->qchange_sleep); 1327 } 1328 1329 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1330 { 1331 struct snd_timer_user *tu = timeri->callback_data; 1332 1333 tu->disconnected = true; 1334 wake_up(&tu->qchange_sleep); 1335 } 1336 1337 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1338 unsigned long resolution, 1339 unsigned long ticks) 1340 { 1341 struct snd_timer_user *tu = timeri->callback_data; 1342 struct snd_timer_tread *r, r1; 1343 struct timespec tstamp; 1344 int prev, append = 0; 1345 1346 memset(&r1, 0, sizeof(r1)); 1347 memset(&tstamp, 0, sizeof(tstamp)); 1348 spin_lock(&tu->qlock); 1349 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1350 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1351 spin_unlock(&tu->qlock); 1352 return; 1353 } 1354 if (tu->last_resolution != resolution || ticks > 0) { 1355 if (timer_tstamp_monotonic) 1356 ktime_get_ts(&tstamp); 1357 else 1358 getnstimeofday(&tstamp); 1359 } 1360 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1361 tu->last_resolution != resolution) { 1362 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1363 r1.tstamp = tstamp; 1364 r1.val = resolution; 1365 snd_timer_user_append_to_tqueue(tu, &r1); 1366 tu->last_resolution = resolution; 1367 append++; 1368 } 1369 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1370 goto __wake; 1371 if (ticks == 0) 1372 goto __wake; 1373 if (tu->qused > 0) { 1374 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1375 r = &tu->tqueue[prev]; 1376 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1377 r->tstamp = tstamp; 1378 r->val += ticks; 1379 append++; 1380 goto __wake; 1381 } 1382 } 1383 r1.event = SNDRV_TIMER_EVENT_TICK; 1384 r1.tstamp = tstamp; 1385 r1.val = ticks; 1386 snd_timer_user_append_to_tqueue(tu, &r1); 1387 append++; 1388 __wake: 1389 spin_unlock(&tu->qlock); 1390 if (append == 0) 1391 return; 1392 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1393 wake_up(&tu->qchange_sleep); 1394 } 1395 1396 static int realloc_user_queue(struct snd_timer_user *tu, int size) 1397 { 1398 struct snd_timer_read *queue = NULL; 1399 struct snd_timer_tread *tqueue = NULL; 1400 1401 if (tu->tread) { 1402 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL); 1403 if (!tqueue) 1404 return -ENOMEM; 1405 } else { 1406 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL); 1407 if (!queue) 1408 return -ENOMEM; 1409 } 1410 1411 spin_lock_irq(&tu->qlock); 1412 kfree(tu->queue); 1413 kfree(tu->tqueue); 1414 tu->queue_size = size; 1415 tu->queue = queue; 1416 tu->tqueue = tqueue; 1417 tu->qhead = tu->qtail = tu->qused = 0; 1418 spin_unlock_irq(&tu->qlock); 1419 1420 return 0; 1421 } 1422 1423 static int snd_timer_user_open(struct inode *inode, struct file *file) 1424 { 1425 struct snd_timer_user *tu; 1426 int err; 1427 1428 err = nonseekable_open(inode, file); 1429 if (err < 0) 1430 return err; 1431 1432 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1433 if (tu == NULL) 1434 return -ENOMEM; 1435 spin_lock_init(&tu->qlock); 1436 init_waitqueue_head(&tu->qchange_sleep); 1437 mutex_init(&tu->ioctl_lock); 1438 tu->ticks = 1; 1439 if (realloc_user_queue(tu, 128) < 0) { 1440 kfree(tu); 1441 return -ENOMEM; 1442 } 1443 file->private_data = tu; 1444 return 0; 1445 } 1446 1447 static int snd_timer_user_release(struct inode *inode, struct file *file) 1448 { 1449 struct snd_timer_user *tu; 1450 1451 if (file->private_data) { 1452 tu = file->private_data; 1453 file->private_data = NULL; 1454 mutex_lock(&tu->ioctl_lock); 1455 if (tu->timeri) 1456 snd_timer_close(tu->timeri); 1457 mutex_unlock(&tu->ioctl_lock); 1458 kfree(tu->queue); 1459 kfree(tu->tqueue); 1460 kfree(tu); 1461 } 1462 return 0; 1463 } 1464 1465 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1466 { 1467 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1468 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1469 id->card = -1; 1470 id->device = -1; 1471 id->subdevice = -1; 1472 } 1473 1474 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1475 { 1476 id->dev_class = timer->tmr_class; 1477 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1478 id->card = timer->card ? timer->card->number : -1; 1479 id->device = timer->tmr_device; 1480 id->subdevice = timer->tmr_subdevice; 1481 } 1482 1483 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1484 { 1485 struct snd_timer_id id; 1486 struct snd_timer *timer; 1487 struct list_head *p; 1488 1489 if (copy_from_user(&id, _tid, sizeof(id))) 1490 return -EFAULT; 1491 mutex_lock(®ister_mutex); 1492 if (id.dev_class < 0) { /* first item */ 1493 if (list_empty(&snd_timer_list)) 1494 snd_timer_user_zero_id(&id); 1495 else { 1496 timer = list_entry(snd_timer_list.next, 1497 struct snd_timer, device_list); 1498 snd_timer_user_copy_id(&id, timer); 1499 } 1500 } else { 1501 switch (id.dev_class) { 1502 case SNDRV_TIMER_CLASS_GLOBAL: 1503 id.device = id.device < 0 ? 0 : id.device + 1; 1504 list_for_each(p, &snd_timer_list) { 1505 timer = list_entry(p, struct snd_timer, device_list); 1506 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1507 snd_timer_user_copy_id(&id, timer); 1508 break; 1509 } 1510 if (timer->tmr_device >= id.device) { 1511 snd_timer_user_copy_id(&id, timer); 1512 break; 1513 } 1514 } 1515 if (p == &snd_timer_list) 1516 snd_timer_user_zero_id(&id); 1517 break; 1518 case SNDRV_TIMER_CLASS_CARD: 1519 case SNDRV_TIMER_CLASS_PCM: 1520 if (id.card < 0) { 1521 id.card = 0; 1522 } else { 1523 if (id.device < 0) { 1524 id.device = 0; 1525 } else { 1526 if (id.subdevice < 0) 1527 id.subdevice = 0; 1528 else if (id.subdevice < INT_MAX) 1529 id.subdevice++; 1530 } 1531 } 1532 list_for_each(p, &snd_timer_list) { 1533 timer = list_entry(p, struct snd_timer, device_list); 1534 if (timer->tmr_class > id.dev_class) { 1535 snd_timer_user_copy_id(&id, timer); 1536 break; 1537 } 1538 if (timer->tmr_class < id.dev_class) 1539 continue; 1540 if (timer->card->number > id.card) { 1541 snd_timer_user_copy_id(&id, timer); 1542 break; 1543 } 1544 if (timer->card->number < id.card) 1545 continue; 1546 if (timer->tmr_device > id.device) { 1547 snd_timer_user_copy_id(&id, timer); 1548 break; 1549 } 1550 if (timer->tmr_device < id.device) 1551 continue; 1552 if (timer->tmr_subdevice > id.subdevice) { 1553 snd_timer_user_copy_id(&id, timer); 1554 break; 1555 } 1556 if (timer->tmr_subdevice < id.subdevice) 1557 continue; 1558 snd_timer_user_copy_id(&id, timer); 1559 break; 1560 } 1561 if (p == &snd_timer_list) 1562 snd_timer_user_zero_id(&id); 1563 break; 1564 default: 1565 snd_timer_user_zero_id(&id); 1566 } 1567 } 1568 mutex_unlock(®ister_mutex); 1569 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1570 return -EFAULT; 1571 return 0; 1572 } 1573 1574 static int snd_timer_user_ginfo(struct file *file, 1575 struct snd_timer_ginfo __user *_ginfo) 1576 { 1577 struct snd_timer_ginfo *ginfo; 1578 struct snd_timer_id tid; 1579 struct snd_timer *t; 1580 struct list_head *p; 1581 int err = 0; 1582 1583 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1584 if (IS_ERR(ginfo)) 1585 return PTR_ERR(ginfo); 1586 1587 tid = ginfo->tid; 1588 memset(ginfo, 0, sizeof(*ginfo)); 1589 ginfo->tid = tid; 1590 mutex_lock(®ister_mutex); 1591 t = snd_timer_find(&tid); 1592 if (t != NULL) { 1593 ginfo->card = t->card ? t->card->number : -1; 1594 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1595 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1596 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1597 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1598 ginfo->resolution = t->hw.resolution; 1599 if (t->hw.resolution_min > 0) { 1600 ginfo->resolution_min = t->hw.resolution_min; 1601 ginfo->resolution_max = t->hw.resolution_max; 1602 } 1603 list_for_each(p, &t->open_list_head) { 1604 ginfo->clients++; 1605 } 1606 } else { 1607 err = -ENODEV; 1608 } 1609 mutex_unlock(®ister_mutex); 1610 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1611 err = -EFAULT; 1612 kfree(ginfo); 1613 return err; 1614 } 1615 1616 static int timer_set_gparams(struct snd_timer_gparams *gparams) 1617 { 1618 struct snd_timer *t; 1619 int err; 1620 1621 mutex_lock(®ister_mutex); 1622 t = snd_timer_find(&gparams->tid); 1623 if (!t) { 1624 err = -ENODEV; 1625 goto _error; 1626 } 1627 if (!list_empty(&t->open_list_head)) { 1628 err = -EBUSY; 1629 goto _error; 1630 } 1631 if (!t->hw.set_period) { 1632 err = -ENOSYS; 1633 goto _error; 1634 } 1635 err = t->hw.set_period(t, gparams->period_num, gparams->period_den); 1636 _error: 1637 mutex_unlock(®ister_mutex); 1638 return err; 1639 } 1640 1641 static int snd_timer_user_gparams(struct file *file, 1642 struct snd_timer_gparams __user *_gparams) 1643 { 1644 struct snd_timer_gparams gparams; 1645 1646 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1647 return -EFAULT; 1648 return timer_set_gparams(&gparams); 1649 } 1650 1651 static int snd_timer_user_gstatus(struct file *file, 1652 struct snd_timer_gstatus __user *_gstatus) 1653 { 1654 struct snd_timer_gstatus gstatus; 1655 struct snd_timer_id tid; 1656 struct snd_timer *t; 1657 int err = 0; 1658 1659 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1660 return -EFAULT; 1661 tid = gstatus.tid; 1662 memset(&gstatus, 0, sizeof(gstatus)); 1663 gstatus.tid = tid; 1664 mutex_lock(®ister_mutex); 1665 t = snd_timer_find(&tid); 1666 if (t != NULL) { 1667 spin_lock_irq(&t->lock); 1668 gstatus.resolution = snd_timer_hw_resolution(t); 1669 if (t->hw.precise_resolution) { 1670 t->hw.precise_resolution(t, &gstatus.resolution_num, 1671 &gstatus.resolution_den); 1672 } else { 1673 gstatus.resolution_num = gstatus.resolution; 1674 gstatus.resolution_den = 1000000000uL; 1675 } 1676 spin_unlock_irq(&t->lock); 1677 } else { 1678 err = -ENODEV; 1679 } 1680 mutex_unlock(®ister_mutex); 1681 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1682 err = -EFAULT; 1683 return err; 1684 } 1685 1686 static int snd_timer_user_tselect(struct file *file, 1687 struct snd_timer_select __user *_tselect) 1688 { 1689 struct snd_timer_user *tu; 1690 struct snd_timer_select tselect; 1691 char str[32]; 1692 int err = 0; 1693 1694 tu = file->private_data; 1695 if (tu->timeri) { 1696 snd_timer_close(tu->timeri); 1697 tu->timeri = NULL; 1698 } 1699 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1700 err = -EFAULT; 1701 goto __err; 1702 } 1703 sprintf(str, "application %i", current->pid); 1704 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1705 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1706 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1707 if (err < 0) 1708 goto __err; 1709 1710 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1711 tu->timeri->callback = tu->tread 1712 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1713 tu->timeri->ccallback = snd_timer_user_ccallback; 1714 tu->timeri->callback_data = (void *)tu; 1715 tu->timeri->disconnect = snd_timer_user_disconnect; 1716 1717 __err: 1718 return err; 1719 } 1720 1721 static int snd_timer_user_info(struct file *file, 1722 struct snd_timer_info __user *_info) 1723 { 1724 struct snd_timer_user *tu; 1725 struct snd_timer_info *info; 1726 struct snd_timer *t; 1727 int err = 0; 1728 1729 tu = file->private_data; 1730 if (!tu->timeri) 1731 return -EBADFD; 1732 t = tu->timeri->timer; 1733 if (!t) 1734 return -EBADFD; 1735 1736 info = kzalloc(sizeof(*info), GFP_KERNEL); 1737 if (! info) 1738 return -ENOMEM; 1739 info->card = t->card ? t->card->number : -1; 1740 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1741 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1742 strlcpy(info->id, t->id, sizeof(info->id)); 1743 strlcpy(info->name, t->name, sizeof(info->name)); 1744 info->resolution = t->hw.resolution; 1745 if (copy_to_user(_info, info, sizeof(*_info))) 1746 err = -EFAULT; 1747 kfree(info); 1748 return err; 1749 } 1750 1751 static int snd_timer_user_params(struct file *file, 1752 struct snd_timer_params __user *_params) 1753 { 1754 struct snd_timer_user *tu; 1755 struct snd_timer_params params; 1756 struct snd_timer *t; 1757 int err; 1758 1759 tu = file->private_data; 1760 if (!tu->timeri) 1761 return -EBADFD; 1762 t = tu->timeri->timer; 1763 if (!t) 1764 return -EBADFD; 1765 if (copy_from_user(¶ms, _params, sizeof(params))) 1766 return -EFAULT; 1767 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) { 1768 u64 resolution; 1769 1770 if (params.ticks < 1) { 1771 err = -EINVAL; 1772 goto _end; 1773 } 1774 1775 /* Don't allow resolution less than 1ms */ 1776 resolution = snd_timer_resolution(tu->timeri); 1777 resolution *= params.ticks; 1778 if (resolution < 1000000) { 1779 err = -EINVAL; 1780 goto _end; 1781 } 1782 } 1783 if (params.queue_size > 0 && 1784 (params.queue_size < 32 || params.queue_size > 1024)) { 1785 err = -EINVAL; 1786 goto _end; 1787 } 1788 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1789 (1<<SNDRV_TIMER_EVENT_TICK)| 1790 (1<<SNDRV_TIMER_EVENT_START)| 1791 (1<<SNDRV_TIMER_EVENT_STOP)| 1792 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1793 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1794 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1795 (1<<SNDRV_TIMER_EVENT_RESUME)| 1796 (1<<SNDRV_TIMER_EVENT_MSTART)| 1797 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1798 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1799 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1800 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1801 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1802 err = -EINVAL; 1803 goto _end; 1804 } 1805 snd_timer_stop(tu->timeri); 1806 spin_lock_irq(&t->lock); 1807 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1808 SNDRV_TIMER_IFLG_EXCLUSIVE| 1809 SNDRV_TIMER_IFLG_EARLY_EVENT); 1810 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1811 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1812 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1813 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1814 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1815 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1816 spin_unlock_irq(&t->lock); 1817 if (params.queue_size > 0 && 1818 (unsigned int)tu->queue_size != params.queue_size) { 1819 err = realloc_user_queue(tu, params.queue_size); 1820 if (err < 0) 1821 goto _end; 1822 } 1823 spin_lock_irq(&tu->qlock); 1824 tu->qhead = tu->qtail = tu->qused = 0; 1825 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1826 if (tu->tread) { 1827 struct snd_timer_tread tread; 1828 memset(&tread, 0, sizeof(tread)); 1829 tread.event = SNDRV_TIMER_EVENT_EARLY; 1830 tread.tstamp.tv_sec = 0; 1831 tread.tstamp.tv_nsec = 0; 1832 tread.val = 0; 1833 snd_timer_user_append_to_tqueue(tu, &tread); 1834 } else { 1835 struct snd_timer_read *r = &tu->queue[0]; 1836 r->resolution = 0; 1837 r->ticks = 0; 1838 tu->qused++; 1839 tu->qtail++; 1840 } 1841 } 1842 tu->filter = params.filter; 1843 tu->ticks = params.ticks; 1844 spin_unlock_irq(&tu->qlock); 1845 err = 0; 1846 _end: 1847 if (copy_to_user(_params, ¶ms, sizeof(params))) 1848 return -EFAULT; 1849 return err; 1850 } 1851 1852 static int snd_timer_user_status(struct file *file, 1853 struct snd_timer_status __user *_status) 1854 { 1855 struct snd_timer_user *tu; 1856 struct snd_timer_status status; 1857 1858 tu = file->private_data; 1859 if (!tu->timeri) 1860 return -EBADFD; 1861 memset(&status, 0, sizeof(status)); 1862 status.tstamp = tu->tstamp; 1863 status.resolution = snd_timer_resolution(tu->timeri); 1864 status.lost = tu->timeri->lost; 1865 status.overrun = tu->overrun; 1866 spin_lock_irq(&tu->qlock); 1867 status.queue = tu->qused; 1868 spin_unlock_irq(&tu->qlock); 1869 if (copy_to_user(_status, &status, sizeof(status))) 1870 return -EFAULT; 1871 return 0; 1872 } 1873 1874 static int snd_timer_user_start(struct file *file) 1875 { 1876 int err; 1877 struct snd_timer_user *tu; 1878 1879 tu = file->private_data; 1880 if (!tu->timeri) 1881 return -EBADFD; 1882 snd_timer_stop(tu->timeri); 1883 tu->timeri->lost = 0; 1884 tu->last_resolution = 0; 1885 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1886 } 1887 1888 static int snd_timer_user_stop(struct file *file) 1889 { 1890 int err; 1891 struct snd_timer_user *tu; 1892 1893 tu = file->private_data; 1894 if (!tu->timeri) 1895 return -EBADFD; 1896 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1897 } 1898 1899 static int snd_timer_user_continue(struct file *file) 1900 { 1901 int err; 1902 struct snd_timer_user *tu; 1903 1904 tu = file->private_data; 1905 if (!tu->timeri) 1906 return -EBADFD; 1907 /* start timer instead of continue if it's not used before */ 1908 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) 1909 return snd_timer_user_start(file); 1910 tu->timeri->lost = 0; 1911 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1912 } 1913 1914 static int snd_timer_user_pause(struct file *file) 1915 { 1916 int err; 1917 struct snd_timer_user *tu; 1918 1919 tu = file->private_data; 1920 if (!tu->timeri) 1921 return -EBADFD; 1922 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1923 } 1924 1925 enum { 1926 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1927 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1928 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1929 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1930 }; 1931 1932 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1933 unsigned long arg) 1934 { 1935 struct snd_timer_user *tu; 1936 void __user *argp = (void __user *)arg; 1937 int __user *p = argp; 1938 1939 tu = file->private_data; 1940 switch (cmd) { 1941 case SNDRV_TIMER_IOCTL_PVERSION: 1942 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1943 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1944 return snd_timer_user_next_device(argp); 1945 case SNDRV_TIMER_IOCTL_TREAD: 1946 { 1947 int xarg, old_tread; 1948 1949 if (tu->timeri) /* too late */ 1950 return -EBUSY; 1951 if (get_user(xarg, p)) 1952 return -EFAULT; 1953 old_tread = tu->tread; 1954 tu->tread = xarg ? 1 : 0; 1955 if (tu->tread != old_tread && 1956 realloc_user_queue(tu, tu->queue_size) < 0) { 1957 tu->tread = old_tread; 1958 return -ENOMEM; 1959 } 1960 return 0; 1961 } 1962 case SNDRV_TIMER_IOCTL_GINFO: 1963 return snd_timer_user_ginfo(file, argp); 1964 case SNDRV_TIMER_IOCTL_GPARAMS: 1965 return snd_timer_user_gparams(file, argp); 1966 case SNDRV_TIMER_IOCTL_GSTATUS: 1967 return snd_timer_user_gstatus(file, argp); 1968 case SNDRV_TIMER_IOCTL_SELECT: 1969 return snd_timer_user_tselect(file, argp); 1970 case SNDRV_TIMER_IOCTL_INFO: 1971 return snd_timer_user_info(file, argp); 1972 case SNDRV_TIMER_IOCTL_PARAMS: 1973 return snd_timer_user_params(file, argp); 1974 case SNDRV_TIMER_IOCTL_STATUS: 1975 return snd_timer_user_status(file, argp); 1976 case SNDRV_TIMER_IOCTL_START: 1977 case SNDRV_TIMER_IOCTL_START_OLD: 1978 return snd_timer_user_start(file); 1979 case SNDRV_TIMER_IOCTL_STOP: 1980 case SNDRV_TIMER_IOCTL_STOP_OLD: 1981 return snd_timer_user_stop(file); 1982 case SNDRV_TIMER_IOCTL_CONTINUE: 1983 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1984 return snd_timer_user_continue(file); 1985 case SNDRV_TIMER_IOCTL_PAUSE: 1986 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1987 return snd_timer_user_pause(file); 1988 } 1989 return -ENOTTY; 1990 } 1991 1992 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1993 unsigned long arg) 1994 { 1995 struct snd_timer_user *tu = file->private_data; 1996 long ret; 1997 1998 mutex_lock(&tu->ioctl_lock); 1999 ret = __snd_timer_user_ioctl(file, cmd, arg); 2000 mutex_unlock(&tu->ioctl_lock); 2001 return ret; 2002 } 2003 2004 static int snd_timer_user_fasync(int fd, struct file * file, int on) 2005 { 2006 struct snd_timer_user *tu; 2007 2008 tu = file->private_data; 2009 return fasync_helper(fd, file, on, &tu->fasync); 2010 } 2011 2012 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 2013 size_t count, loff_t *offset) 2014 { 2015 struct snd_timer_user *tu; 2016 long result = 0, unit; 2017 int qhead; 2018 int err = 0; 2019 2020 tu = file->private_data; 2021 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 2022 mutex_lock(&tu->ioctl_lock); 2023 spin_lock_irq(&tu->qlock); 2024 while ((long)count - result >= unit) { 2025 while (!tu->qused) { 2026 wait_queue_entry_t wait; 2027 2028 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 2029 err = -EAGAIN; 2030 goto _error; 2031 } 2032 2033 set_current_state(TASK_INTERRUPTIBLE); 2034 init_waitqueue_entry(&wait, current); 2035 add_wait_queue(&tu->qchange_sleep, &wait); 2036 2037 spin_unlock_irq(&tu->qlock); 2038 mutex_unlock(&tu->ioctl_lock); 2039 schedule(); 2040 mutex_lock(&tu->ioctl_lock); 2041 spin_lock_irq(&tu->qlock); 2042 2043 remove_wait_queue(&tu->qchange_sleep, &wait); 2044 2045 if (tu->disconnected) { 2046 err = -ENODEV; 2047 goto _error; 2048 } 2049 if (signal_pending(current)) { 2050 err = -ERESTARTSYS; 2051 goto _error; 2052 } 2053 } 2054 2055 qhead = tu->qhead++; 2056 tu->qhead %= tu->queue_size; 2057 tu->qused--; 2058 spin_unlock_irq(&tu->qlock); 2059 2060 if (tu->tread) { 2061 if (copy_to_user(buffer, &tu->tqueue[qhead], 2062 sizeof(struct snd_timer_tread))) 2063 err = -EFAULT; 2064 } else { 2065 if (copy_to_user(buffer, &tu->queue[qhead], 2066 sizeof(struct snd_timer_read))) 2067 err = -EFAULT; 2068 } 2069 2070 spin_lock_irq(&tu->qlock); 2071 if (err < 0) 2072 goto _error; 2073 result += unit; 2074 buffer += unit; 2075 } 2076 _error: 2077 spin_unlock_irq(&tu->qlock); 2078 mutex_unlock(&tu->ioctl_lock); 2079 return result > 0 ? result : err; 2080 } 2081 2082 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait) 2083 { 2084 __poll_t mask; 2085 struct snd_timer_user *tu; 2086 2087 tu = file->private_data; 2088 2089 poll_wait(file, &tu->qchange_sleep, wait); 2090 2091 mask = 0; 2092 spin_lock_irq(&tu->qlock); 2093 if (tu->qused) 2094 mask |= EPOLLIN | EPOLLRDNORM; 2095 if (tu->disconnected) 2096 mask |= EPOLLERR; 2097 spin_unlock_irq(&tu->qlock); 2098 2099 return mask; 2100 } 2101 2102 #ifdef CONFIG_COMPAT 2103 #include "timer_compat.c" 2104 #else 2105 #define snd_timer_user_ioctl_compat NULL 2106 #endif 2107 2108 static const struct file_operations snd_timer_f_ops = 2109 { 2110 .owner = THIS_MODULE, 2111 .read = snd_timer_user_read, 2112 .open = snd_timer_user_open, 2113 .release = snd_timer_user_release, 2114 .llseek = no_llseek, 2115 .poll = snd_timer_user_poll, 2116 .unlocked_ioctl = snd_timer_user_ioctl, 2117 .compat_ioctl = snd_timer_user_ioctl_compat, 2118 .fasync = snd_timer_user_fasync, 2119 }; 2120 2121 /* unregister the system timer */ 2122 static void snd_timer_free_all(void) 2123 { 2124 struct snd_timer *timer, *n; 2125 2126 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2127 snd_timer_free(timer); 2128 } 2129 2130 static struct device timer_dev; 2131 2132 /* 2133 * ENTRY functions 2134 */ 2135 2136 static int __init alsa_timer_init(void) 2137 { 2138 int err; 2139 2140 snd_device_initialize(&timer_dev, NULL); 2141 dev_set_name(&timer_dev, "timer"); 2142 2143 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2144 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2145 "system timer"); 2146 #endif 2147 2148 err = snd_timer_register_system(); 2149 if (err < 0) { 2150 pr_err("ALSA: unable to register system timer (%i)\n", err); 2151 goto put_timer; 2152 } 2153 2154 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2155 &snd_timer_f_ops, NULL, &timer_dev); 2156 if (err < 0) { 2157 pr_err("ALSA: unable to register timer device (%i)\n", err); 2158 snd_timer_free_all(); 2159 goto put_timer; 2160 } 2161 2162 snd_timer_proc_init(); 2163 return 0; 2164 2165 put_timer: 2166 put_device(&timer_dev); 2167 return err; 2168 } 2169 2170 static void __exit alsa_timer_exit(void) 2171 { 2172 snd_unregister_device(&timer_dev); 2173 snd_timer_free_all(); 2174 put_device(&timer_dev); 2175 snd_timer_proc_done(); 2176 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2177 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2178 #endif 2179 } 2180 2181 module_init(alsa_timer_init) 2182 module_exit(alsa_timer_exit) 2183