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