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 (rtimer) 887 *rtimer = NULL; 888 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 889 if (!timer) 890 return -ENOMEM; 891 timer->tmr_class = tid->dev_class; 892 timer->card = card; 893 timer->tmr_device = tid->device; 894 timer->tmr_subdevice = tid->subdevice; 895 if (id) 896 strlcpy(timer->id, id, sizeof(timer->id)); 897 timer->sticks = 1; 898 INIT_LIST_HEAD(&timer->device_list); 899 INIT_LIST_HEAD(&timer->open_list_head); 900 INIT_LIST_HEAD(&timer->active_list_head); 901 INIT_LIST_HEAD(&timer->ack_list_head); 902 INIT_LIST_HEAD(&timer->sack_list_head); 903 spin_lock_init(&timer->lock); 904 tasklet_init(&timer->task_queue, snd_timer_tasklet, 905 (unsigned long)timer); 906 timer->max_instances = 1000; /* default limit per timer */ 907 if (card != NULL) { 908 timer->module = card->module; 909 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 910 if (err < 0) { 911 snd_timer_free(timer); 912 return err; 913 } 914 } 915 if (rtimer) 916 *rtimer = timer; 917 return 0; 918 } 919 EXPORT_SYMBOL(snd_timer_new); 920 921 static int snd_timer_free(struct snd_timer *timer) 922 { 923 if (!timer) 924 return 0; 925 926 mutex_lock(®ister_mutex); 927 if (! list_empty(&timer->open_list_head)) { 928 struct list_head *p, *n; 929 struct snd_timer_instance *ti; 930 pr_warn("ALSA: timer %p is busy?\n", timer); 931 list_for_each_safe(p, n, &timer->open_list_head) { 932 list_del_init(p); 933 ti = list_entry(p, struct snd_timer_instance, open_list); 934 ti->timer = NULL; 935 } 936 } 937 list_del(&timer->device_list); 938 mutex_unlock(®ister_mutex); 939 940 if (timer->private_free) 941 timer->private_free(timer); 942 kfree(timer); 943 return 0; 944 } 945 946 static int snd_timer_dev_free(struct snd_device *device) 947 { 948 struct snd_timer *timer = device->device_data; 949 return snd_timer_free(timer); 950 } 951 952 static int snd_timer_dev_register(struct snd_device *dev) 953 { 954 struct snd_timer *timer = dev->device_data; 955 struct snd_timer *timer1; 956 957 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 958 return -ENXIO; 959 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 960 !timer->hw.resolution && timer->hw.c_resolution == NULL) 961 return -EINVAL; 962 963 mutex_lock(®ister_mutex); 964 list_for_each_entry(timer1, &snd_timer_list, device_list) { 965 if (timer1->tmr_class > timer->tmr_class) 966 break; 967 if (timer1->tmr_class < timer->tmr_class) 968 continue; 969 if (timer1->card && timer->card) { 970 if (timer1->card->number > timer->card->number) 971 break; 972 if (timer1->card->number < timer->card->number) 973 continue; 974 } 975 if (timer1->tmr_device > timer->tmr_device) 976 break; 977 if (timer1->tmr_device < timer->tmr_device) 978 continue; 979 if (timer1->tmr_subdevice > timer->tmr_subdevice) 980 break; 981 if (timer1->tmr_subdevice < timer->tmr_subdevice) 982 continue; 983 /* conflicts.. */ 984 mutex_unlock(®ister_mutex); 985 return -EBUSY; 986 } 987 list_add_tail(&timer->device_list, &timer1->device_list); 988 mutex_unlock(®ister_mutex); 989 return 0; 990 } 991 992 static int snd_timer_dev_disconnect(struct snd_device *device) 993 { 994 struct snd_timer *timer = device->device_data; 995 struct snd_timer_instance *ti; 996 997 mutex_lock(®ister_mutex); 998 list_del_init(&timer->device_list); 999 /* wake up pending sleepers */ 1000 list_for_each_entry(ti, &timer->open_list_head, open_list) { 1001 if (ti->disconnect) 1002 ti->disconnect(ti); 1003 } 1004 mutex_unlock(®ister_mutex); 1005 return 0; 1006 } 1007 1008 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 1009 { 1010 unsigned long flags; 1011 unsigned long resolution = 0; 1012 struct snd_timer_instance *ti, *ts; 1013 1014 if (timer->card && timer->card->shutdown) 1015 return; 1016 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 1017 return; 1018 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 1019 event > SNDRV_TIMER_EVENT_MRESUME)) 1020 return; 1021 spin_lock_irqsave(&timer->lock, flags); 1022 if (event == SNDRV_TIMER_EVENT_MSTART || 1023 event == SNDRV_TIMER_EVENT_MCONTINUE || 1024 event == SNDRV_TIMER_EVENT_MRESUME) 1025 resolution = snd_timer_hw_resolution(timer); 1026 list_for_each_entry(ti, &timer->active_list_head, active_list) { 1027 if (ti->ccallback) 1028 ti->ccallback(ti, event, tstamp, resolution); 1029 list_for_each_entry(ts, &ti->slave_active_head, active_list) 1030 if (ts->ccallback) 1031 ts->ccallback(ts, event, tstamp, resolution); 1032 } 1033 spin_unlock_irqrestore(&timer->lock, flags); 1034 } 1035 EXPORT_SYMBOL(snd_timer_notify); 1036 1037 /* 1038 * exported functions for global timers 1039 */ 1040 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 1041 { 1042 struct snd_timer_id tid; 1043 1044 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 1045 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1046 tid.card = -1; 1047 tid.device = device; 1048 tid.subdevice = 0; 1049 return snd_timer_new(NULL, id, &tid, rtimer); 1050 } 1051 EXPORT_SYMBOL(snd_timer_global_new); 1052 1053 int snd_timer_global_free(struct snd_timer *timer) 1054 { 1055 return snd_timer_free(timer); 1056 } 1057 EXPORT_SYMBOL(snd_timer_global_free); 1058 1059 int snd_timer_global_register(struct snd_timer *timer) 1060 { 1061 struct snd_device dev; 1062 1063 memset(&dev, 0, sizeof(dev)); 1064 dev.device_data = timer; 1065 return snd_timer_dev_register(&dev); 1066 } 1067 EXPORT_SYMBOL(snd_timer_global_register); 1068 1069 /* 1070 * System timer 1071 */ 1072 1073 struct snd_timer_system_private { 1074 struct timer_list tlist; 1075 struct snd_timer *snd_timer; 1076 unsigned long last_expires; 1077 unsigned long last_jiffies; 1078 unsigned long correction; 1079 }; 1080 1081 static void snd_timer_s_function(struct timer_list *t) 1082 { 1083 struct snd_timer_system_private *priv = from_timer(priv, t, 1084 tlist); 1085 struct snd_timer *timer = priv->snd_timer; 1086 unsigned long jiff = jiffies; 1087 if (time_after(jiff, priv->last_expires)) 1088 priv->correction += (long)jiff - (long)priv->last_expires; 1089 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1090 } 1091 1092 static int snd_timer_s_start(struct snd_timer * timer) 1093 { 1094 struct snd_timer_system_private *priv; 1095 unsigned long njiff; 1096 1097 priv = (struct snd_timer_system_private *) timer->private_data; 1098 njiff = (priv->last_jiffies = jiffies); 1099 if (priv->correction > timer->sticks - 1) { 1100 priv->correction -= timer->sticks - 1; 1101 njiff++; 1102 } else { 1103 njiff += timer->sticks - priv->correction; 1104 priv->correction = 0; 1105 } 1106 priv->last_expires = njiff; 1107 mod_timer(&priv->tlist, njiff); 1108 return 0; 1109 } 1110 1111 static int snd_timer_s_stop(struct snd_timer * timer) 1112 { 1113 struct snd_timer_system_private *priv; 1114 unsigned long jiff; 1115 1116 priv = (struct snd_timer_system_private *) timer->private_data; 1117 del_timer(&priv->tlist); 1118 jiff = jiffies; 1119 if (time_before(jiff, priv->last_expires)) 1120 timer->sticks = priv->last_expires - jiff; 1121 else 1122 timer->sticks = 1; 1123 priv->correction = 0; 1124 return 0; 1125 } 1126 1127 static int snd_timer_s_close(struct snd_timer *timer) 1128 { 1129 struct snd_timer_system_private *priv; 1130 1131 priv = (struct snd_timer_system_private *)timer->private_data; 1132 del_timer_sync(&priv->tlist); 1133 return 0; 1134 } 1135 1136 static struct snd_timer_hardware snd_timer_system = 1137 { 1138 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1139 .resolution = 1000000000L / HZ, 1140 .ticks = 10000000L, 1141 .close = snd_timer_s_close, 1142 .start = snd_timer_s_start, 1143 .stop = snd_timer_s_stop 1144 }; 1145 1146 static void snd_timer_free_system(struct snd_timer *timer) 1147 { 1148 kfree(timer->private_data); 1149 } 1150 1151 static int snd_timer_register_system(void) 1152 { 1153 struct snd_timer *timer; 1154 struct snd_timer_system_private *priv; 1155 int err; 1156 1157 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1158 if (err < 0) 1159 return err; 1160 strcpy(timer->name, "system timer"); 1161 timer->hw = snd_timer_system; 1162 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1163 if (priv == NULL) { 1164 snd_timer_free(timer); 1165 return -ENOMEM; 1166 } 1167 priv->snd_timer = timer; 1168 timer_setup(&priv->tlist, snd_timer_s_function, 0); 1169 timer->private_data = priv; 1170 timer->private_free = snd_timer_free_system; 1171 return snd_timer_global_register(timer); 1172 } 1173 1174 #ifdef CONFIG_SND_PROC_FS 1175 /* 1176 * Info interface 1177 */ 1178 1179 static void snd_timer_proc_read(struct snd_info_entry *entry, 1180 struct snd_info_buffer *buffer) 1181 { 1182 struct snd_timer *timer; 1183 struct snd_timer_instance *ti; 1184 1185 mutex_lock(®ister_mutex); 1186 list_for_each_entry(timer, &snd_timer_list, device_list) { 1187 if (timer->card && timer->card->shutdown) 1188 continue; 1189 switch (timer->tmr_class) { 1190 case SNDRV_TIMER_CLASS_GLOBAL: 1191 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1192 break; 1193 case SNDRV_TIMER_CLASS_CARD: 1194 snd_iprintf(buffer, "C%i-%i: ", 1195 timer->card->number, timer->tmr_device); 1196 break; 1197 case SNDRV_TIMER_CLASS_PCM: 1198 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1199 timer->tmr_device, timer->tmr_subdevice); 1200 break; 1201 default: 1202 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1203 timer->card ? timer->card->number : -1, 1204 timer->tmr_device, timer->tmr_subdevice); 1205 } 1206 snd_iprintf(buffer, "%s :", timer->name); 1207 if (timer->hw.resolution) 1208 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1209 timer->hw.resolution / 1000, 1210 timer->hw.resolution % 1000, 1211 timer->hw.ticks); 1212 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1213 snd_iprintf(buffer, " SLAVE"); 1214 snd_iprintf(buffer, "\n"); 1215 list_for_each_entry(ti, &timer->open_list_head, open_list) 1216 snd_iprintf(buffer, " Client %s : %s\n", 1217 ti->owner ? ti->owner : "unknown", 1218 ti->flags & (SNDRV_TIMER_IFLG_START | 1219 SNDRV_TIMER_IFLG_RUNNING) 1220 ? "running" : "stopped"); 1221 } 1222 mutex_unlock(®ister_mutex); 1223 } 1224 1225 static struct snd_info_entry *snd_timer_proc_entry; 1226 1227 static void __init snd_timer_proc_init(void) 1228 { 1229 struct snd_info_entry *entry; 1230 1231 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1232 if (entry != NULL) { 1233 entry->c.text.read = snd_timer_proc_read; 1234 if (snd_info_register(entry) < 0) { 1235 snd_info_free_entry(entry); 1236 entry = NULL; 1237 } 1238 } 1239 snd_timer_proc_entry = entry; 1240 } 1241 1242 static void __exit snd_timer_proc_done(void) 1243 { 1244 snd_info_free_entry(snd_timer_proc_entry); 1245 } 1246 #else /* !CONFIG_SND_PROC_FS */ 1247 #define snd_timer_proc_init() 1248 #define snd_timer_proc_done() 1249 #endif 1250 1251 /* 1252 * USER SPACE interface 1253 */ 1254 1255 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1256 unsigned long resolution, 1257 unsigned long ticks) 1258 { 1259 struct snd_timer_user *tu = timeri->callback_data; 1260 struct snd_timer_read *r; 1261 int prev; 1262 1263 spin_lock(&tu->qlock); 1264 if (tu->qused > 0) { 1265 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1266 r = &tu->queue[prev]; 1267 if (r->resolution == resolution) { 1268 r->ticks += ticks; 1269 goto __wake; 1270 } 1271 } 1272 if (tu->qused >= tu->queue_size) { 1273 tu->overrun++; 1274 } else { 1275 r = &tu->queue[tu->qtail++]; 1276 tu->qtail %= tu->queue_size; 1277 r->resolution = resolution; 1278 r->ticks = ticks; 1279 tu->qused++; 1280 } 1281 __wake: 1282 spin_unlock(&tu->qlock); 1283 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1284 wake_up(&tu->qchange_sleep); 1285 } 1286 1287 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1288 struct snd_timer_tread *tread) 1289 { 1290 if (tu->qused >= tu->queue_size) { 1291 tu->overrun++; 1292 } else { 1293 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1294 tu->qtail %= tu->queue_size; 1295 tu->qused++; 1296 } 1297 } 1298 1299 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1300 int event, 1301 struct timespec *tstamp, 1302 unsigned long resolution) 1303 { 1304 struct snd_timer_user *tu = timeri->callback_data; 1305 struct snd_timer_tread r1; 1306 unsigned long flags; 1307 1308 if (event >= SNDRV_TIMER_EVENT_START && 1309 event <= SNDRV_TIMER_EVENT_PAUSE) 1310 tu->tstamp = *tstamp; 1311 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1312 return; 1313 memset(&r1, 0, sizeof(r1)); 1314 r1.event = event; 1315 r1.tstamp = *tstamp; 1316 r1.val = resolution; 1317 spin_lock_irqsave(&tu->qlock, flags); 1318 snd_timer_user_append_to_tqueue(tu, &r1); 1319 spin_unlock_irqrestore(&tu->qlock, flags); 1320 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1321 wake_up(&tu->qchange_sleep); 1322 } 1323 1324 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1325 { 1326 struct snd_timer_user *tu = timeri->callback_data; 1327 1328 tu->disconnected = true; 1329 wake_up(&tu->qchange_sleep); 1330 } 1331 1332 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1333 unsigned long resolution, 1334 unsigned long ticks) 1335 { 1336 struct snd_timer_user *tu = timeri->callback_data; 1337 struct snd_timer_tread *r, r1; 1338 struct timespec tstamp; 1339 int prev, append = 0; 1340 1341 memset(&r1, 0, sizeof(r1)); 1342 memset(&tstamp, 0, sizeof(tstamp)); 1343 spin_lock(&tu->qlock); 1344 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1345 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1346 spin_unlock(&tu->qlock); 1347 return; 1348 } 1349 if (tu->last_resolution != resolution || ticks > 0) { 1350 if (timer_tstamp_monotonic) 1351 ktime_get_ts(&tstamp); 1352 else 1353 getnstimeofday(&tstamp); 1354 } 1355 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1356 tu->last_resolution != resolution) { 1357 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1358 r1.tstamp = tstamp; 1359 r1.val = resolution; 1360 snd_timer_user_append_to_tqueue(tu, &r1); 1361 tu->last_resolution = resolution; 1362 append++; 1363 } 1364 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1365 goto __wake; 1366 if (ticks == 0) 1367 goto __wake; 1368 if (tu->qused > 0) { 1369 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1370 r = &tu->tqueue[prev]; 1371 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1372 r->tstamp = tstamp; 1373 r->val += ticks; 1374 append++; 1375 goto __wake; 1376 } 1377 } 1378 r1.event = SNDRV_TIMER_EVENT_TICK; 1379 r1.tstamp = tstamp; 1380 r1.val = ticks; 1381 snd_timer_user_append_to_tqueue(tu, &r1); 1382 append++; 1383 __wake: 1384 spin_unlock(&tu->qlock); 1385 if (append == 0) 1386 return; 1387 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1388 wake_up(&tu->qchange_sleep); 1389 } 1390 1391 static int realloc_user_queue(struct snd_timer_user *tu, int size) 1392 { 1393 struct snd_timer_read *queue = NULL; 1394 struct snd_timer_tread *tqueue = NULL; 1395 1396 if (tu->tread) { 1397 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL); 1398 if (!tqueue) 1399 return -ENOMEM; 1400 } else { 1401 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL); 1402 if (!queue) 1403 return -ENOMEM; 1404 } 1405 1406 spin_lock_irq(&tu->qlock); 1407 kfree(tu->queue); 1408 kfree(tu->tqueue); 1409 tu->queue_size = size; 1410 tu->queue = queue; 1411 tu->tqueue = tqueue; 1412 tu->qhead = tu->qtail = tu->qused = 0; 1413 spin_unlock_irq(&tu->qlock); 1414 1415 return 0; 1416 } 1417 1418 static int snd_timer_user_open(struct inode *inode, struct file *file) 1419 { 1420 struct snd_timer_user *tu; 1421 int err; 1422 1423 err = nonseekable_open(inode, file); 1424 if (err < 0) 1425 return err; 1426 1427 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1428 if (tu == NULL) 1429 return -ENOMEM; 1430 spin_lock_init(&tu->qlock); 1431 init_waitqueue_head(&tu->qchange_sleep); 1432 mutex_init(&tu->ioctl_lock); 1433 tu->ticks = 1; 1434 if (realloc_user_queue(tu, 128) < 0) { 1435 kfree(tu); 1436 return -ENOMEM; 1437 } 1438 file->private_data = tu; 1439 return 0; 1440 } 1441 1442 static int snd_timer_user_release(struct inode *inode, struct file *file) 1443 { 1444 struct snd_timer_user *tu; 1445 1446 if (file->private_data) { 1447 tu = file->private_data; 1448 file->private_data = NULL; 1449 mutex_lock(&tu->ioctl_lock); 1450 if (tu->timeri) 1451 snd_timer_close(tu->timeri); 1452 mutex_unlock(&tu->ioctl_lock); 1453 kfree(tu->queue); 1454 kfree(tu->tqueue); 1455 kfree(tu); 1456 } 1457 return 0; 1458 } 1459 1460 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1461 { 1462 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1463 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1464 id->card = -1; 1465 id->device = -1; 1466 id->subdevice = -1; 1467 } 1468 1469 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1470 { 1471 id->dev_class = timer->tmr_class; 1472 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1473 id->card = timer->card ? timer->card->number : -1; 1474 id->device = timer->tmr_device; 1475 id->subdevice = timer->tmr_subdevice; 1476 } 1477 1478 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1479 { 1480 struct snd_timer_id id; 1481 struct snd_timer *timer; 1482 struct list_head *p; 1483 1484 if (copy_from_user(&id, _tid, sizeof(id))) 1485 return -EFAULT; 1486 mutex_lock(®ister_mutex); 1487 if (id.dev_class < 0) { /* first item */ 1488 if (list_empty(&snd_timer_list)) 1489 snd_timer_user_zero_id(&id); 1490 else { 1491 timer = list_entry(snd_timer_list.next, 1492 struct snd_timer, device_list); 1493 snd_timer_user_copy_id(&id, timer); 1494 } 1495 } else { 1496 switch (id.dev_class) { 1497 case SNDRV_TIMER_CLASS_GLOBAL: 1498 id.device = id.device < 0 ? 0 : id.device + 1; 1499 list_for_each(p, &snd_timer_list) { 1500 timer = list_entry(p, struct snd_timer, device_list); 1501 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1502 snd_timer_user_copy_id(&id, timer); 1503 break; 1504 } 1505 if (timer->tmr_device >= id.device) { 1506 snd_timer_user_copy_id(&id, timer); 1507 break; 1508 } 1509 } 1510 if (p == &snd_timer_list) 1511 snd_timer_user_zero_id(&id); 1512 break; 1513 case SNDRV_TIMER_CLASS_CARD: 1514 case SNDRV_TIMER_CLASS_PCM: 1515 if (id.card < 0) { 1516 id.card = 0; 1517 } else { 1518 if (id.device < 0) { 1519 id.device = 0; 1520 } else { 1521 if (id.subdevice < 0) 1522 id.subdevice = 0; 1523 else if (id.subdevice < INT_MAX) 1524 id.subdevice++; 1525 } 1526 } 1527 list_for_each(p, &snd_timer_list) { 1528 timer = list_entry(p, struct snd_timer, device_list); 1529 if (timer->tmr_class > id.dev_class) { 1530 snd_timer_user_copy_id(&id, timer); 1531 break; 1532 } 1533 if (timer->tmr_class < id.dev_class) 1534 continue; 1535 if (timer->card->number > id.card) { 1536 snd_timer_user_copy_id(&id, timer); 1537 break; 1538 } 1539 if (timer->card->number < id.card) 1540 continue; 1541 if (timer->tmr_device > id.device) { 1542 snd_timer_user_copy_id(&id, timer); 1543 break; 1544 } 1545 if (timer->tmr_device < id.device) 1546 continue; 1547 if (timer->tmr_subdevice > id.subdevice) { 1548 snd_timer_user_copy_id(&id, timer); 1549 break; 1550 } 1551 if (timer->tmr_subdevice < id.subdevice) 1552 continue; 1553 snd_timer_user_copy_id(&id, timer); 1554 break; 1555 } 1556 if (p == &snd_timer_list) 1557 snd_timer_user_zero_id(&id); 1558 break; 1559 default: 1560 snd_timer_user_zero_id(&id); 1561 } 1562 } 1563 mutex_unlock(®ister_mutex); 1564 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1565 return -EFAULT; 1566 return 0; 1567 } 1568 1569 static int snd_timer_user_ginfo(struct file *file, 1570 struct snd_timer_ginfo __user *_ginfo) 1571 { 1572 struct snd_timer_ginfo *ginfo; 1573 struct snd_timer_id tid; 1574 struct snd_timer *t; 1575 struct list_head *p; 1576 int err = 0; 1577 1578 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1579 if (IS_ERR(ginfo)) 1580 return PTR_ERR(ginfo); 1581 1582 tid = ginfo->tid; 1583 memset(ginfo, 0, sizeof(*ginfo)); 1584 ginfo->tid = tid; 1585 mutex_lock(®ister_mutex); 1586 t = snd_timer_find(&tid); 1587 if (t != NULL) { 1588 ginfo->card = t->card ? t->card->number : -1; 1589 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1590 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1591 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1592 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1593 ginfo->resolution = t->hw.resolution; 1594 if (t->hw.resolution_min > 0) { 1595 ginfo->resolution_min = t->hw.resolution_min; 1596 ginfo->resolution_max = t->hw.resolution_max; 1597 } 1598 list_for_each(p, &t->open_list_head) { 1599 ginfo->clients++; 1600 } 1601 } else { 1602 err = -ENODEV; 1603 } 1604 mutex_unlock(®ister_mutex); 1605 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1606 err = -EFAULT; 1607 kfree(ginfo); 1608 return err; 1609 } 1610 1611 static int timer_set_gparams(struct snd_timer_gparams *gparams) 1612 { 1613 struct snd_timer *t; 1614 int err; 1615 1616 mutex_lock(®ister_mutex); 1617 t = snd_timer_find(&gparams->tid); 1618 if (!t) { 1619 err = -ENODEV; 1620 goto _error; 1621 } 1622 if (!list_empty(&t->open_list_head)) { 1623 err = -EBUSY; 1624 goto _error; 1625 } 1626 if (!t->hw.set_period) { 1627 err = -ENOSYS; 1628 goto _error; 1629 } 1630 err = t->hw.set_period(t, gparams->period_num, gparams->period_den); 1631 _error: 1632 mutex_unlock(®ister_mutex); 1633 return err; 1634 } 1635 1636 static int snd_timer_user_gparams(struct file *file, 1637 struct snd_timer_gparams __user *_gparams) 1638 { 1639 struct snd_timer_gparams gparams; 1640 1641 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1642 return -EFAULT; 1643 return timer_set_gparams(&gparams); 1644 } 1645 1646 static int snd_timer_user_gstatus(struct file *file, 1647 struct snd_timer_gstatus __user *_gstatus) 1648 { 1649 struct snd_timer_gstatus gstatus; 1650 struct snd_timer_id tid; 1651 struct snd_timer *t; 1652 int err = 0; 1653 1654 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1655 return -EFAULT; 1656 tid = gstatus.tid; 1657 memset(&gstatus, 0, sizeof(gstatus)); 1658 gstatus.tid = tid; 1659 mutex_lock(®ister_mutex); 1660 t = snd_timer_find(&tid); 1661 if (t != NULL) { 1662 spin_lock_irq(&t->lock); 1663 gstatus.resolution = snd_timer_hw_resolution(t); 1664 if (t->hw.precise_resolution) { 1665 t->hw.precise_resolution(t, &gstatus.resolution_num, 1666 &gstatus.resolution_den); 1667 } else { 1668 gstatus.resolution_num = gstatus.resolution; 1669 gstatus.resolution_den = 1000000000uL; 1670 } 1671 spin_unlock_irq(&t->lock); 1672 } else { 1673 err = -ENODEV; 1674 } 1675 mutex_unlock(®ister_mutex); 1676 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1677 err = -EFAULT; 1678 return err; 1679 } 1680 1681 static int snd_timer_user_tselect(struct file *file, 1682 struct snd_timer_select __user *_tselect) 1683 { 1684 struct snd_timer_user *tu; 1685 struct snd_timer_select tselect; 1686 char str[32]; 1687 int err = 0; 1688 1689 tu = file->private_data; 1690 if (tu->timeri) { 1691 snd_timer_close(tu->timeri); 1692 tu->timeri = NULL; 1693 } 1694 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1695 err = -EFAULT; 1696 goto __err; 1697 } 1698 sprintf(str, "application %i", current->pid); 1699 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1700 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1701 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1702 if (err < 0) 1703 goto __err; 1704 1705 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1706 tu->timeri->callback = tu->tread 1707 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1708 tu->timeri->ccallback = snd_timer_user_ccallback; 1709 tu->timeri->callback_data = (void *)tu; 1710 tu->timeri->disconnect = snd_timer_user_disconnect; 1711 1712 __err: 1713 return err; 1714 } 1715 1716 static int snd_timer_user_info(struct file *file, 1717 struct snd_timer_info __user *_info) 1718 { 1719 struct snd_timer_user *tu; 1720 struct snd_timer_info *info; 1721 struct snd_timer *t; 1722 int err = 0; 1723 1724 tu = file->private_data; 1725 if (!tu->timeri) 1726 return -EBADFD; 1727 t = tu->timeri->timer; 1728 if (!t) 1729 return -EBADFD; 1730 1731 info = kzalloc(sizeof(*info), GFP_KERNEL); 1732 if (! info) 1733 return -ENOMEM; 1734 info->card = t->card ? t->card->number : -1; 1735 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1736 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1737 strlcpy(info->id, t->id, sizeof(info->id)); 1738 strlcpy(info->name, t->name, sizeof(info->name)); 1739 info->resolution = t->hw.resolution; 1740 if (copy_to_user(_info, info, sizeof(*_info))) 1741 err = -EFAULT; 1742 kfree(info); 1743 return err; 1744 } 1745 1746 static int snd_timer_user_params(struct file *file, 1747 struct snd_timer_params __user *_params) 1748 { 1749 struct snd_timer_user *tu; 1750 struct snd_timer_params params; 1751 struct snd_timer *t; 1752 int err; 1753 1754 tu = file->private_data; 1755 if (!tu->timeri) 1756 return -EBADFD; 1757 t = tu->timeri->timer; 1758 if (!t) 1759 return -EBADFD; 1760 if (copy_from_user(¶ms, _params, sizeof(params))) 1761 return -EFAULT; 1762 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) { 1763 u64 resolution; 1764 1765 if (params.ticks < 1) { 1766 err = -EINVAL; 1767 goto _end; 1768 } 1769 1770 /* Don't allow resolution less than 1ms */ 1771 resolution = snd_timer_resolution(tu->timeri); 1772 resolution *= params.ticks; 1773 if (resolution < 1000000) { 1774 err = -EINVAL; 1775 goto _end; 1776 } 1777 } 1778 if (params.queue_size > 0 && 1779 (params.queue_size < 32 || params.queue_size > 1024)) { 1780 err = -EINVAL; 1781 goto _end; 1782 } 1783 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1784 (1<<SNDRV_TIMER_EVENT_TICK)| 1785 (1<<SNDRV_TIMER_EVENT_START)| 1786 (1<<SNDRV_TIMER_EVENT_STOP)| 1787 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1788 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1789 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1790 (1<<SNDRV_TIMER_EVENT_RESUME)| 1791 (1<<SNDRV_TIMER_EVENT_MSTART)| 1792 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1793 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1794 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1795 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1796 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1797 err = -EINVAL; 1798 goto _end; 1799 } 1800 snd_timer_stop(tu->timeri); 1801 spin_lock_irq(&t->lock); 1802 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1803 SNDRV_TIMER_IFLG_EXCLUSIVE| 1804 SNDRV_TIMER_IFLG_EARLY_EVENT); 1805 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1806 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1807 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1808 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1809 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1810 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1811 spin_unlock_irq(&t->lock); 1812 if (params.queue_size > 0 && 1813 (unsigned int)tu->queue_size != params.queue_size) { 1814 err = realloc_user_queue(tu, params.queue_size); 1815 if (err < 0) 1816 goto _end; 1817 } 1818 spin_lock_irq(&tu->qlock); 1819 tu->qhead = tu->qtail = tu->qused = 0; 1820 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1821 if (tu->tread) { 1822 struct snd_timer_tread tread; 1823 memset(&tread, 0, sizeof(tread)); 1824 tread.event = SNDRV_TIMER_EVENT_EARLY; 1825 tread.tstamp.tv_sec = 0; 1826 tread.tstamp.tv_nsec = 0; 1827 tread.val = 0; 1828 snd_timer_user_append_to_tqueue(tu, &tread); 1829 } else { 1830 struct snd_timer_read *r = &tu->queue[0]; 1831 r->resolution = 0; 1832 r->ticks = 0; 1833 tu->qused++; 1834 tu->qtail++; 1835 } 1836 } 1837 tu->filter = params.filter; 1838 tu->ticks = params.ticks; 1839 spin_unlock_irq(&tu->qlock); 1840 err = 0; 1841 _end: 1842 if (copy_to_user(_params, ¶ms, sizeof(params))) 1843 return -EFAULT; 1844 return err; 1845 } 1846 1847 static int snd_timer_user_status(struct file *file, 1848 struct snd_timer_status __user *_status) 1849 { 1850 struct snd_timer_user *tu; 1851 struct snd_timer_status status; 1852 1853 tu = file->private_data; 1854 if (!tu->timeri) 1855 return -EBADFD; 1856 memset(&status, 0, sizeof(status)); 1857 status.tstamp = tu->tstamp; 1858 status.resolution = snd_timer_resolution(tu->timeri); 1859 status.lost = tu->timeri->lost; 1860 status.overrun = tu->overrun; 1861 spin_lock_irq(&tu->qlock); 1862 status.queue = tu->qused; 1863 spin_unlock_irq(&tu->qlock); 1864 if (copy_to_user(_status, &status, sizeof(status))) 1865 return -EFAULT; 1866 return 0; 1867 } 1868 1869 static int snd_timer_user_start(struct file *file) 1870 { 1871 int err; 1872 struct snd_timer_user *tu; 1873 1874 tu = file->private_data; 1875 if (!tu->timeri) 1876 return -EBADFD; 1877 snd_timer_stop(tu->timeri); 1878 tu->timeri->lost = 0; 1879 tu->last_resolution = 0; 1880 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1881 } 1882 1883 static int snd_timer_user_stop(struct file *file) 1884 { 1885 int err; 1886 struct snd_timer_user *tu; 1887 1888 tu = file->private_data; 1889 if (!tu->timeri) 1890 return -EBADFD; 1891 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1892 } 1893 1894 static int snd_timer_user_continue(struct file *file) 1895 { 1896 int err; 1897 struct snd_timer_user *tu; 1898 1899 tu = file->private_data; 1900 if (!tu->timeri) 1901 return -EBADFD; 1902 /* start timer instead of continue if it's not used before */ 1903 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) 1904 return snd_timer_user_start(file); 1905 tu->timeri->lost = 0; 1906 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1907 } 1908 1909 static int snd_timer_user_pause(struct file *file) 1910 { 1911 int err; 1912 struct snd_timer_user *tu; 1913 1914 tu = file->private_data; 1915 if (!tu->timeri) 1916 return -EBADFD; 1917 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1918 } 1919 1920 enum { 1921 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1922 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1923 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1924 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1925 }; 1926 1927 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1928 unsigned long arg) 1929 { 1930 struct snd_timer_user *tu; 1931 void __user *argp = (void __user *)arg; 1932 int __user *p = argp; 1933 1934 tu = file->private_data; 1935 switch (cmd) { 1936 case SNDRV_TIMER_IOCTL_PVERSION: 1937 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1938 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1939 return snd_timer_user_next_device(argp); 1940 case SNDRV_TIMER_IOCTL_TREAD: 1941 { 1942 int xarg, old_tread; 1943 1944 if (tu->timeri) /* too late */ 1945 return -EBUSY; 1946 if (get_user(xarg, p)) 1947 return -EFAULT; 1948 old_tread = tu->tread; 1949 tu->tread = xarg ? 1 : 0; 1950 if (tu->tread != old_tread && 1951 realloc_user_queue(tu, tu->queue_size) < 0) { 1952 tu->tread = old_tread; 1953 return -ENOMEM; 1954 } 1955 return 0; 1956 } 1957 case SNDRV_TIMER_IOCTL_GINFO: 1958 return snd_timer_user_ginfo(file, argp); 1959 case SNDRV_TIMER_IOCTL_GPARAMS: 1960 return snd_timer_user_gparams(file, argp); 1961 case SNDRV_TIMER_IOCTL_GSTATUS: 1962 return snd_timer_user_gstatus(file, argp); 1963 case SNDRV_TIMER_IOCTL_SELECT: 1964 return snd_timer_user_tselect(file, argp); 1965 case SNDRV_TIMER_IOCTL_INFO: 1966 return snd_timer_user_info(file, argp); 1967 case SNDRV_TIMER_IOCTL_PARAMS: 1968 return snd_timer_user_params(file, argp); 1969 case SNDRV_TIMER_IOCTL_STATUS: 1970 return snd_timer_user_status(file, argp); 1971 case SNDRV_TIMER_IOCTL_START: 1972 case SNDRV_TIMER_IOCTL_START_OLD: 1973 return snd_timer_user_start(file); 1974 case SNDRV_TIMER_IOCTL_STOP: 1975 case SNDRV_TIMER_IOCTL_STOP_OLD: 1976 return snd_timer_user_stop(file); 1977 case SNDRV_TIMER_IOCTL_CONTINUE: 1978 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1979 return snd_timer_user_continue(file); 1980 case SNDRV_TIMER_IOCTL_PAUSE: 1981 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1982 return snd_timer_user_pause(file); 1983 } 1984 return -ENOTTY; 1985 } 1986 1987 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1988 unsigned long arg) 1989 { 1990 struct snd_timer_user *tu = file->private_data; 1991 long ret; 1992 1993 mutex_lock(&tu->ioctl_lock); 1994 ret = __snd_timer_user_ioctl(file, cmd, arg); 1995 mutex_unlock(&tu->ioctl_lock); 1996 return ret; 1997 } 1998 1999 static int snd_timer_user_fasync(int fd, struct file * file, int on) 2000 { 2001 struct snd_timer_user *tu; 2002 2003 tu = file->private_data; 2004 return fasync_helper(fd, file, on, &tu->fasync); 2005 } 2006 2007 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 2008 size_t count, loff_t *offset) 2009 { 2010 struct snd_timer_user *tu; 2011 long result = 0, unit; 2012 int qhead; 2013 int err = 0; 2014 2015 tu = file->private_data; 2016 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 2017 mutex_lock(&tu->ioctl_lock); 2018 spin_lock_irq(&tu->qlock); 2019 while ((long)count - result >= unit) { 2020 while (!tu->qused) { 2021 wait_queue_entry_t wait; 2022 2023 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 2024 err = -EAGAIN; 2025 goto _error; 2026 } 2027 2028 set_current_state(TASK_INTERRUPTIBLE); 2029 init_waitqueue_entry(&wait, current); 2030 add_wait_queue(&tu->qchange_sleep, &wait); 2031 2032 spin_unlock_irq(&tu->qlock); 2033 mutex_unlock(&tu->ioctl_lock); 2034 schedule(); 2035 mutex_lock(&tu->ioctl_lock); 2036 spin_lock_irq(&tu->qlock); 2037 2038 remove_wait_queue(&tu->qchange_sleep, &wait); 2039 2040 if (tu->disconnected) { 2041 err = -ENODEV; 2042 goto _error; 2043 } 2044 if (signal_pending(current)) { 2045 err = -ERESTARTSYS; 2046 goto _error; 2047 } 2048 } 2049 2050 qhead = tu->qhead++; 2051 tu->qhead %= tu->queue_size; 2052 tu->qused--; 2053 spin_unlock_irq(&tu->qlock); 2054 2055 if (tu->tread) { 2056 if (copy_to_user(buffer, &tu->tqueue[qhead], 2057 sizeof(struct snd_timer_tread))) 2058 err = -EFAULT; 2059 } else { 2060 if (copy_to_user(buffer, &tu->queue[qhead], 2061 sizeof(struct snd_timer_read))) 2062 err = -EFAULT; 2063 } 2064 2065 spin_lock_irq(&tu->qlock); 2066 if (err < 0) 2067 goto _error; 2068 result += unit; 2069 buffer += unit; 2070 } 2071 _error: 2072 spin_unlock_irq(&tu->qlock); 2073 mutex_unlock(&tu->ioctl_lock); 2074 return result > 0 ? result : err; 2075 } 2076 2077 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait) 2078 { 2079 __poll_t mask; 2080 struct snd_timer_user *tu; 2081 2082 tu = file->private_data; 2083 2084 poll_wait(file, &tu->qchange_sleep, wait); 2085 2086 mask = 0; 2087 spin_lock_irq(&tu->qlock); 2088 if (tu->qused) 2089 mask |= EPOLLIN | EPOLLRDNORM; 2090 if (tu->disconnected) 2091 mask |= EPOLLERR; 2092 spin_unlock_irq(&tu->qlock); 2093 2094 return mask; 2095 } 2096 2097 #ifdef CONFIG_COMPAT 2098 #include "timer_compat.c" 2099 #else 2100 #define snd_timer_user_ioctl_compat NULL 2101 #endif 2102 2103 static const struct file_operations snd_timer_f_ops = 2104 { 2105 .owner = THIS_MODULE, 2106 .read = snd_timer_user_read, 2107 .open = snd_timer_user_open, 2108 .release = snd_timer_user_release, 2109 .llseek = no_llseek, 2110 .poll = snd_timer_user_poll, 2111 .unlocked_ioctl = snd_timer_user_ioctl, 2112 .compat_ioctl = snd_timer_user_ioctl_compat, 2113 .fasync = snd_timer_user_fasync, 2114 }; 2115 2116 /* unregister the system timer */ 2117 static void snd_timer_free_all(void) 2118 { 2119 struct snd_timer *timer, *n; 2120 2121 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2122 snd_timer_free(timer); 2123 } 2124 2125 static struct device timer_dev; 2126 2127 /* 2128 * ENTRY functions 2129 */ 2130 2131 static int __init alsa_timer_init(void) 2132 { 2133 int err; 2134 2135 snd_device_initialize(&timer_dev, NULL); 2136 dev_set_name(&timer_dev, "timer"); 2137 2138 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2139 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2140 "system timer"); 2141 #endif 2142 2143 err = snd_timer_register_system(); 2144 if (err < 0) { 2145 pr_err("ALSA: unable to register system timer (%i)\n", err); 2146 goto put_timer; 2147 } 2148 2149 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2150 &snd_timer_f_ops, NULL, &timer_dev); 2151 if (err < 0) { 2152 pr_err("ALSA: unable to register timer device (%i)\n", err); 2153 snd_timer_free_all(); 2154 goto put_timer; 2155 } 2156 2157 snd_timer_proc_init(); 2158 return 0; 2159 2160 put_timer: 2161 put_device(&timer_dev); 2162 return err; 2163 } 2164 2165 static void __exit alsa_timer_exit(void) 2166 { 2167 snd_unregister_device(&timer_dev); 2168 snd_timer_free_all(); 2169 put_device(&timer_dev); 2170 snd_timer_proc_done(); 2171 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2172 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2173 #endif 2174 } 2175 2176 module_init(alsa_timer_init) 2177 module_exit(alsa_timer_exit) 2178