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 #define SNDRV_TIMER_IFLG_DEAD 0x00020000 42 43 #if IS_ENABLED(CONFIG_SND_HRTIMER) 44 #define DEFAULT_TIMER_LIMIT 4 45 #else 46 #define DEFAULT_TIMER_LIMIT 1 47 #endif 48 49 static int timer_limit = DEFAULT_TIMER_LIMIT; 50 static int timer_tstamp_monotonic = 1; 51 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 52 MODULE_DESCRIPTION("ALSA timer interface"); 53 MODULE_LICENSE("GPL"); 54 module_param(timer_limit, int, 0444); 55 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 56 module_param(timer_tstamp_monotonic, int, 0444); 57 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 58 59 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 60 MODULE_ALIAS("devname:snd/timer"); 61 62 struct snd_timer_user { 63 struct snd_timer_instance *timeri; 64 int tread; /* enhanced read with timestamps and events */ 65 unsigned long ticks; 66 unsigned long overrun; 67 int qhead; 68 int qtail; 69 int qused; 70 int queue_size; 71 bool disconnected; 72 struct snd_timer_read *queue; 73 struct snd_timer_tread *tqueue; 74 spinlock_t qlock; 75 unsigned long last_resolution; 76 unsigned int filter; 77 struct timespec tstamp; /* trigger tstamp */ 78 wait_queue_head_t qchange_sleep; 79 struct fasync_struct *fasync; 80 struct mutex ioctl_lock; 81 }; 82 83 /* list of timers */ 84 static LIST_HEAD(snd_timer_list); 85 86 /* list of slave instances */ 87 static LIST_HEAD(snd_timer_slave_list); 88 89 /* lock for slave active lists */ 90 static DEFINE_SPINLOCK(slave_active_lock); 91 92 static DEFINE_MUTEX(register_mutex); 93 94 static int snd_timer_free(struct snd_timer *timer); 95 static int snd_timer_dev_free(struct snd_device *device); 96 static int snd_timer_dev_register(struct snd_device *device); 97 static int snd_timer_dev_disconnect(struct snd_device *device); 98 99 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 100 101 /* 102 * create a timer instance with the given owner string. 103 * when timer is not NULL, increments the module counter 104 */ 105 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 106 struct snd_timer *timer) 107 { 108 struct snd_timer_instance *timeri; 109 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 110 if (timeri == NULL) 111 return NULL; 112 timeri->owner = kstrdup(owner, GFP_KERNEL); 113 if (! timeri->owner) { 114 kfree(timeri); 115 return NULL; 116 } 117 INIT_LIST_HEAD(&timeri->open_list); 118 INIT_LIST_HEAD(&timeri->active_list); 119 INIT_LIST_HEAD(&timeri->ack_list); 120 INIT_LIST_HEAD(&timeri->slave_list_head); 121 INIT_LIST_HEAD(&timeri->slave_active_head); 122 123 timeri->timer = timer; 124 if (timer && !try_module_get(timer->module)) { 125 kfree(timeri->owner); 126 kfree(timeri); 127 return NULL; 128 } 129 130 return timeri; 131 } 132 133 /* 134 * find a timer instance from the given timer id 135 */ 136 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 137 { 138 struct snd_timer *timer = NULL; 139 140 list_for_each_entry(timer, &snd_timer_list, device_list) { 141 if (timer->tmr_class != tid->dev_class) 142 continue; 143 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 144 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 145 (timer->card == NULL || 146 timer->card->number != tid->card)) 147 continue; 148 if (timer->tmr_device != tid->device) 149 continue; 150 if (timer->tmr_subdevice != tid->subdevice) 151 continue; 152 return timer; 153 } 154 return NULL; 155 } 156 157 #ifdef CONFIG_MODULES 158 159 static void snd_timer_request(struct snd_timer_id *tid) 160 { 161 switch (tid->dev_class) { 162 case SNDRV_TIMER_CLASS_GLOBAL: 163 if (tid->device < timer_limit) 164 request_module("snd-timer-%i", tid->device); 165 break; 166 case SNDRV_TIMER_CLASS_CARD: 167 case SNDRV_TIMER_CLASS_PCM: 168 if (tid->card < snd_ecards_limit) 169 request_module("snd-card-%i", tid->card); 170 break; 171 default: 172 break; 173 } 174 } 175 176 #endif 177 178 /* 179 * look for a master instance matching with the slave id of the given slave. 180 * when found, relink the open_link of the slave. 181 * 182 * call this with register_mutex down. 183 */ 184 static int snd_timer_check_slave(struct snd_timer_instance *slave) 185 { 186 struct snd_timer *timer; 187 struct snd_timer_instance *master; 188 189 /* FIXME: it's really dumb to look up all entries.. */ 190 list_for_each_entry(timer, &snd_timer_list, device_list) { 191 list_for_each_entry(master, &timer->open_list_head, open_list) { 192 if (slave->slave_class == master->slave_class && 193 slave->slave_id == master->slave_id) { 194 if (master->timer->num_instances >= 195 master->timer->max_instances) 196 return -EBUSY; 197 list_move_tail(&slave->open_list, 198 &master->slave_list_head); 199 master->timer->num_instances++; 200 spin_lock_irq(&slave_active_lock); 201 slave->master = master; 202 slave->timer = master->timer; 203 spin_unlock_irq(&slave_active_lock); 204 return 0; 205 } 206 } 207 } 208 return 0; 209 } 210 211 /* 212 * look for slave instances matching with the slave id of the given master. 213 * when found, relink the open_link of slaves. 214 * 215 * call this with register_mutex down. 216 */ 217 static int snd_timer_check_master(struct snd_timer_instance *master) 218 { 219 struct snd_timer_instance *slave, *tmp; 220 221 /* check all pending slaves */ 222 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 223 if (slave->slave_class == master->slave_class && 224 slave->slave_id == master->slave_id) { 225 if (master->timer->num_instances >= 226 master->timer->max_instances) 227 return -EBUSY; 228 list_move_tail(&slave->open_list, &master->slave_list_head); 229 master->timer->num_instances++; 230 spin_lock_irq(&slave_active_lock); 231 spin_lock(&master->timer->lock); 232 slave->master = master; 233 slave->timer = master->timer; 234 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 235 list_add_tail(&slave->active_list, 236 &master->slave_active_head); 237 spin_unlock(&master->timer->lock); 238 spin_unlock_irq(&slave_active_lock); 239 } 240 } 241 return 0; 242 } 243 244 static int snd_timer_close_locked(struct snd_timer_instance *timeri); 245 246 /* 247 * open a timer instance 248 * when opening a master, the slave id must be here given. 249 */ 250 int snd_timer_open(struct snd_timer_instance **ti, 251 char *owner, struct snd_timer_id *tid, 252 unsigned int slave_id) 253 { 254 struct snd_timer *timer; 255 struct snd_timer_instance *timeri = NULL; 256 int err; 257 258 mutex_lock(®ister_mutex); 259 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 260 /* open a slave instance */ 261 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 262 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 263 pr_debug("ALSA: timer: invalid slave class %i\n", 264 tid->dev_sclass); 265 err = -EINVAL; 266 goto unlock; 267 } 268 timeri = snd_timer_instance_new(owner, NULL); 269 if (!timeri) { 270 err = -ENOMEM; 271 goto unlock; 272 } 273 timeri->slave_class = tid->dev_sclass; 274 timeri->slave_id = tid->device; 275 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 276 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 277 err = snd_timer_check_slave(timeri); 278 if (err < 0) { 279 snd_timer_close_locked(timeri); 280 timeri = NULL; 281 } 282 goto unlock; 283 } 284 285 /* open a master instance */ 286 timer = snd_timer_find(tid); 287 #ifdef CONFIG_MODULES 288 if (!timer) { 289 mutex_unlock(®ister_mutex); 290 snd_timer_request(tid); 291 mutex_lock(®ister_mutex); 292 timer = snd_timer_find(tid); 293 } 294 #endif 295 if (!timer) { 296 err = -ENODEV; 297 goto unlock; 298 } 299 if (!list_empty(&timer->open_list_head)) { 300 timeri = list_entry(timer->open_list_head.next, 301 struct snd_timer_instance, open_list); 302 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 303 err = -EBUSY; 304 timeri = NULL; 305 goto unlock; 306 } 307 } 308 if (timer->num_instances >= timer->max_instances) { 309 err = -EBUSY; 310 goto unlock; 311 } 312 timeri = snd_timer_instance_new(owner, timer); 313 if (!timeri) { 314 err = -ENOMEM; 315 goto unlock; 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 err = timer->hw.open(timer); 325 if (err) { 326 kfree(timeri->owner); 327 kfree(timeri); 328 timeri = NULL; 329 330 if (timer->card) 331 put_device(&timer->card->card_dev); 332 module_put(timer->module); 333 goto unlock; 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 } 344 345 unlock: 346 mutex_unlock(®ister_mutex); 347 *ti = timeri; 348 return err; 349 } 350 EXPORT_SYMBOL(snd_timer_open); 351 352 /* 353 * close a timer instance 354 * call this with register_mutex down. 355 */ 356 static int snd_timer_close_locked(struct snd_timer_instance *timeri) 357 { 358 struct snd_timer *timer = timeri->timer; 359 struct snd_timer_instance *slave, *tmp; 360 361 if (timer) { 362 spin_lock_irq(&timer->lock); 363 timeri->flags |= SNDRV_TIMER_IFLG_DEAD; 364 spin_unlock_irq(&timer->lock); 365 } 366 367 list_del(&timeri->open_list); 368 369 /* force to stop the timer */ 370 snd_timer_stop(timeri); 371 372 if (timer) { 373 timer->num_instances--; 374 /* wait, until the active callback is finished */ 375 spin_lock_irq(&timer->lock); 376 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 377 spin_unlock_irq(&timer->lock); 378 udelay(10); 379 spin_lock_irq(&timer->lock); 380 } 381 spin_unlock_irq(&timer->lock); 382 383 /* remove slave links */ 384 spin_lock_irq(&slave_active_lock); 385 spin_lock(&timer->lock); 386 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 387 open_list) { 388 list_move_tail(&slave->open_list, &snd_timer_slave_list); 389 timer->num_instances--; 390 slave->master = NULL; 391 slave->timer = NULL; 392 list_del_init(&slave->ack_list); 393 list_del_init(&slave->active_list); 394 } 395 spin_unlock(&timer->lock); 396 spin_unlock_irq(&slave_active_lock); 397 398 /* slave doesn't need to release timer resources below */ 399 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 400 timer = NULL; 401 } 402 403 if (timeri->private_free) 404 timeri->private_free(timeri); 405 kfree(timeri->owner); 406 kfree(timeri); 407 408 if (timer) { 409 if (list_empty(&timer->open_list_head) && timer->hw.close) 410 timer->hw.close(timer); 411 /* release a card refcount for safe disconnection */ 412 if (timer->card) 413 put_device(&timer->card->card_dev); 414 module_put(timer->module); 415 } 416 417 return 0; 418 } 419 420 /* 421 * close a timer instance 422 */ 423 int snd_timer_close(struct snd_timer_instance *timeri) 424 { 425 int err; 426 427 if (snd_BUG_ON(!timeri)) 428 return -ENXIO; 429 430 mutex_lock(®ister_mutex); 431 err = snd_timer_close_locked(timeri); 432 mutex_unlock(®ister_mutex); 433 return err; 434 } 435 EXPORT_SYMBOL(snd_timer_close); 436 437 static unsigned long snd_timer_hw_resolution(struct snd_timer *timer) 438 { 439 if (timer->hw.c_resolution) 440 return timer->hw.c_resolution(timer); 441 else 442 return timer->hw.resolution; 443 } 444 445 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 446 { 447 struct snd_timer * timer; 448 unsigned long ret = 0; 449 unsigned long flags; 450 451 if (timeri == NULL) 452 return 0; 453 timer = timeri->timer; 454 if (timer) { 455 spin_lock_irqsave(&timer->lock, flags); 456 ret = snd_timer_hw_resolution(timer); 457 spin_unlock_irqrestore(&timer->lock, flags); 458 } 459 return ret; 460 } 461 EXPORT_SYMBOL(snd_timer_resolution); 462 463 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 464 { 465 struct snd_timer *timer = ti->timer; 466 unsigned long resolution = 0; 467 struct snd_timer_instance *ts; 468 struct timespec tstamp; 469 470 if (timer_tstamp_monotonic) 471 ktime_get_ts(&tstamp); 472 else 473 getnstimeofday(&tstamp); 474 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 475 event > SNDRV_TIMER_EVENT_PAUSE)) 476 return; 477 if (timer && 478 (event == SNDRV_TIMER_EVENT_START || 479 event == SNDRV_TIMER_EVENT_CONTINUE)) 480 resolution = snd_timer_hw_resolution(timer); 481 if (ti->ccallback) 482 ti->ccallback(ti, event, &tstamp, resolution); 483 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 484 return; 485 if (timer == NULL) 486 return; 487 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 488 return; 489 list_for_each_entry(ts, &ti->slave_active_head, active_list) 490 if (ts->ccallback) 491 ts->ccallback(ts, event + 100, &tstamp, resolution); 492 } 493 494 /* start/continue a master timer */ 495 static int snd_timer_start1(struct snd_timer_instance *timeri, 496 bool start, unsigned long ticks) 497 { 498 struct snd_timer *timer; 499 int result; 500 unsigned long flags; 501 502 timer = timeri->timer; 503 if (!timer) 504 return -EINVAL; 505 506 spin_lock_irqsave(&timer->lock, flags); 507 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) { 508 result = -EINVAL; 509 goto unlock; 510 } 511 if (timer->card && timer->card->shutdown) { 512 result = -ENODEV; 513 goto unlock; 514 } 515 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 516 SNDRV_TIMER_IFLG_START)) { 517 result = -EBUSY; 518 goto unlock; 519 } 520 521 if (start) 522 timeri->ticks = timeri->cticks = ticks; 523 else if (!timeri->cticks) 524 timeri->cticks = 1; 525 timeri->pticks = 0; 526 527 list_move_tail(&timeri->active_list, &timer->active_list_head); 528 if (timer->running) { 529 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 530 goto __start_now; 531 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 532 timeri->flags |= SNDRV_TIMER_IFLG_START; 533 result = 1; /* delayed start */ 534 } else { 535 if (start) 536 timer->sticks = ticks; 537 timer->hw.start(timer); 538 __start_now: 539 timer->running++; 540 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 541 result = 0; 542 } 543 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 544 SNDRV_TIMER_EVENT_CONTINUE); 545 unlock: 546 spin_unlock_irqrestore(&timer->lock, flags); 547 return result; 548 } 549 550 /* start/continue a slave timer */ 551 static int snd_timer_start_slave(struct snd_timer_instance *timeri, 552 bool start) 553 { 554 unsigned long flags; 555 int err; 556 557 spin_lock_irqsave(&slave_active_lock, flags); 558 if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) { 559 err = -EINVAL; 560 goto unlock; 561 } 562 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 563 err = -EBUSY; 564 goto unlock; 565 } 566 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 567 if (timeri->master && timeri->timer) { 568 spin_lock(&timeri->timer->lock); 569 list_add_tail(&timeri->active_list, 570 &timeri->master->slave_active_head); 571 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 572 SNDRV_TIMER_EVENT_CONTINUE); 573 spin_unlock(&timeri->timer->lock); 574 } 575 err = 1; /* delayed start */ 576 unlock: 577 spin_unlock_irqrestore(&slave_active_lock, flags); 578 return err; 579 } 580 581 /* stop/pause a master timer */ 582 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) 583 { 584 struct snd_timer *timer; 585 int result = 0; 586 unsigned long flags; 587 588 timer = timeri->timer; 589 if (!timer) 590 return -EINVAL; 591 spin_lock_irqsave(&timer->lock, flags); 592 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 593 SNDRV_TIMER_IFLG_START))) { 594 result = -EBUSY; 595 goto unlock; 596 } 597 list_del_init(&timeri->ack_list); 598 list_del_init(&timeri->active_list); 599 if (timer->card && timer->card->shutdown) 600 goto unlock; 601 if (stop) { 602 timeri->cticks = timeri->ticks; 603 timeri->pticks = 0; 604 } 605 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 606 !(--timer->running)) { 607 timer->hw.stop(timer); 608 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 609 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 610 snd_timer_reschedule(timer, 0); 611 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 612 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 613 timer->hw.start(timer); 614 } 615 } 616 } 617 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 618 if (stop) 619 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED; 620 else 621 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED; 622 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 623 SNDRV_TIMER_EVENT_PAUSE); 624 unlock: 625 spin_unlock_irqrestore(&timer->lock, flags); 626 return result; 627 } 628 629 /* stop/pause a slave timer */ 630 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) 631 { 632 unsigned long flags; 633 634 spin_lock_irqsave(&slave_active_lock, flags); 635 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) { 636 spin_unlock_irqrestore(&slave_active_lock, flags); 637 return -EBUSY; 638 } 639 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 640 if (timeri->timer) { 641 spin_lock(&timeri->timer->lock); 642 list_del_init(&timeri->ack_list); 643 list_del_init(&timeri->active_list); 644 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 645 SNDRV_TIMER_EVENT_PAUSE); 646 spin_unlock(&timeri->timer->lock); 647 } 648 spin_unlock_irqrestore(&slave_active_lock, flags); 649 return 0; 650 } 651 652 /* 653 * start the timer instance 654 */ 655 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 656 { 657 if (timeri == NULL || ticks < 1) 658 return -EINVAL; 659 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 660 return snd_timer_start_slave(timeri, true); 661 else 662 return snd_timer_start1(timeri, true, ticks); 663 } 664 EXPORT_SYMBOL(snd_timer_start); 665 666 /* 667 * stop the timer instance. 668 * 669 * do not call this from the timer callback! 670 */ 671 int snd_timer_stop(struct snd_timer_instance *timeri) 672 { 673 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 674 return snd_timer_stop_slave(timeri, true); 675 else 676 return snd_timer_stop1(timeri, true); 677 } 678 EXPORT_SYMBOL(snd_timer_stop); 679 680 /* 681 * start again.. the tick is kept. 682 */ 683 int snd_timer_continue(struct snd_timer_instance *timeri) 684 { 685 /* timer can continue only after pause */ 686 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) 687 return -EINVAL; 688 689 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 690 return snd_timer_start_slave(timeri, false); 691 else 692 return snd_timer_start1(timeri, false, 0); 693 } 694 EXPORT_SYMBOL(snd_timer_continue); 695 696 /* 697 * pause.. remember the ticks left 698 */ 699 int snd_timer_pause(struct snd_timer_instance * timeri) 700 { 701 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 702 return snd_timer_stop_slave(timeri, false); 703 else 704 return snd_timer_stop1(timeri, false); 705 } 706 EXPORT_SYMBOL(snd_timer_pause); 707 708 /* 709 * reschedule the timer 710 * 711 * start pending instances and check the scheduling ticks. 712 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 713 */ 714 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 715 { 716 struct snd_timer_instance *ti; 717 unsigned long ticks = ~0UL; 718 719 list_for_each_entry(ti, &timer->active_list_head, active_list) { 720 if (ti->flags & SNDRV_TIMER_IFLG_START) { 721 ti->flags &= ~SNDRV_TIMER_IFLG_START; 722 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 723 timer->running++; 724 } 725 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 726 if (ticks > ti->cticks) 727 ticks = ti->cticks; 728 } 729 } 730 if (ticks == ~0UL) { 731 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 732 return; 733 } 734 if (ticks > timer->hw.ticks) 735 ticks = timer->hw.ticks; 736 if (ticks_left != ticks) 737 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 738 timer->sticks = ticks; 739 } 740 741 /* call callbacks in timer ack list */ 742 static void snd_timer_process_callbacks(struct snd_timer *timer, 743 struct list_head *head) 744 { 745 struct snd_timer_instance *ti; 746 unsigned long resolution, ticks; 747 748 while (!list_empty(head)) { 749 ti = list_first_entry(head, struct snd_timer_instance, 750 ack_list); 751 752 /* remove from ack_list and make empty */ 753 list_del_init(&ti->ack_list); 754 755 if (!(ti->flags & SNDRV_TIMER_IFLG_DEAD)) { 756 ticks = ti->pticks; 757 ti->pticks = 0; 758 resolution = ti->resolution; 759 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 760 spin_unlock(&timer->lock); 761 if (ti->callback) 762 ti->callback(ti, resolution, ticks); 763 spin_lock(&timer->lock); 764 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 765 } 766 } 767 } 768 769 /* clear pending instances from ack list */ 770 static void snd_timer_clear_callbacks(struct snd_timer *timer, 771 struct list_head *head) 772 { 773 unsigned long flags; 774 775 spin_lock_irqsave(&timer->lock, flags); 776 while (!list_empty(head)) 777 list_del_init(head->next); 778 spin_unlock_irqrestore(&timer->lock, flags); 779 } 780 781 /* 782 * timer tasklet 783 * 784 */ 785 static void snd_timer_tasklet(unsigned long arg) 786 { 787 struct snd_timer *timer = (struct snd_timer *) arg; 788 unsigned long flags; 789 790 if (timer->card && timer->card->shutdown) { 791 snd_timer_clear_callbacks(timer, &timer->sack_list_head); 792 return; 793 } 794 795 spin_lock_irqsave(&timer->lock, flags); 796 snd_timer_process_callbacks(timer, &timer->sack_list_head); 797 spin_unlock_irqrestore(&timer->lock, flags); 798 } 799 800 /* 801 * timer interrupt 802 * 803 * ticks_left is usually equal to timer->sticks. 804 * 805 */ 806 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 807 { 808 struct snd_timer_instance *ti, *ts, *tmp; 809 unsigned long resolution; 810 struct list_head *ack_list_head; 811 unsigned long flags; 812 int use_tasklet = 0; 813 814 if (timer == NULL) 815 return; 816 817 if (timer->card && timer->card->shutdown) { 818 snd_timer_clear_callbacks(timer, &timer->ack_list_head); 819 return; 820 } 821 822 spin_lock_irqsave(&timer->lock, flags); 823 824 /* remember the current resolution */ 825 resolution = snd_timer_hw_resolution(timer); 826 827 /* loop for all active instances 828 * Here we cannot use list_for_each_entry because the active_list of a 829 * processed instance is relinked to done_list_head before the callback 830 * is called. 831 */ 832 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 833 active_list) { 834 if (ti->flags & SNDRV_TIMER_IFLG_DEAD) 835 continue; 836 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 837 continue; 838 ti->pticks += ticks_left; 839 ti->resolution = resolution; 840 if (ti->cticks < ticks_left) 841 ti->cticks = 0; 842 else 843 ti->cticks -= ticks_left; 844 if (ti->cticks) /* not expired */ 845 continue; 846 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 847 ti->cticks = ti->ticks; 848 } else { 849 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 850 --timer->running; 851 list_del_init(&ti->active_list); 852 } 853 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 854 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 855 ack_list_head = &timer->ack_list_head; 856 else 857 ack_list_head = &timer->sack_list_head; 858 if (list_empty(&ti->ack_list)) 859 list_add_tail(&ti->ack_list, ack_list_head); 860 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 861 ts->pticks = ti->pticks; 862 ts->resolution = resolution; 863 if (list_empty(&ts->ack_list)) 864 list_add_tail(&ts->ack_list, ack_list_head); 865 } 866 } 867 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 868 snd_timer_reschedule(timer, timer->sticks); 869 if (timer->running) { 870 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 871 timer->hw.stop(timer); 872 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 873 } 874 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 875 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 876 /* restart timer */ 877 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 878 timer->hw.start(timer); 879 } 880 } else { 881 timer->hw.stop(timer); 882 } 883 884 /* now process all fast callbacks */ 885 snd_timer_process_callbacks(timer, &timer->ack_list_head); 886 887 /* do we have any slow callbacks? */ 888 use_tasklet = !list_empty(&timer->sack_list_head); 889 spin_unlock_irqrestore(&timer->lock, flags); 890 891 if (use_tasklet) 892 tasklet_schedule(&timer->task_queue); 893 } 894 EXPORT_SYMBOL(snd_timer_interrupt); 895 896 /* 897 898 */ 899 900 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 901 struct snd_timer **rtimer) 902 { 903 struct snd_timer *timer; 904 int err; 905 static struct snd_device_ops ops = { 906 .dev_free = snd_timer_dev_free, 907 .dev_register = snd_timer_dev_register, 908 .dev_disconnect = snd_timer_dev_disconnect, 909 }; 910 911 if (snd_BUG_ON(!tid)) 912 return -EINVAL; 913 if (tid->dev_class == SNDRV_TIMER_CLASS_CARD || 914 tid->dev_class == SNDRV_TIMER_CLASS_PCM) { 915 if (WARN_ON(!card)) 916 return -EINVAL; 917 } 918 if (rtimer) 919 *rtimer = NULL; 920 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 921 if (!timer) 922 return -ENOMEM; 923 timer->tmr_class = tid->dev_class; 924 timer->card = card; 925 timer->tmr_device = tid->device; 926 timer->tmr_subdevice = tid->subdevice; 927 if (id) 928 strlcpy(timer->id, id, sizeof(timer->id)); 929 timer->sticks = 1; 930 INIT_LIST_HEAD(&timer->device_list); 931 INIT_LIST_HEAD(&timer->open_list_head); 932 INIT_LIST_HEAD(&timer->active_list_head); 933 INIT_LIST_HEAD(&timer->ack_list_head); 934 INIT_LIST_HEAD(&timer->sack_list_head); 935 spin_lock_init(&timer->lock); 936 tasklet_init(&timer->task_queue, snd_timer_tasklet, 937 (unsigned long)timer); 938 timer->max_instances = 1000; /* default limit per timer */ 939 if (card != NULL) { 940 timer->module = card->module; 941 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 942 if (err < 0) { 943 snd_timer_free(timer); 944 return err; 945 } 946 } 947 if (rtimer) 948 *rtimer = timer; 949 return 0; 950 } 951 EXPORT_SYMBOL(snd_timer_new); 952 953 static int snd_timer_free(struct snd_timer *timer) 954 { 955 if (!timer) 956 return 0; 957 958 mutex_lock(®ister_mutex); 959 if (! list_empty(&timer->open_list_head)) { 960 struct list_head *p, *n; 961 struct snd_timer_instance *ti; 962 pr_warn("ALSA: timer %p is busy?\n", timer); 963 list_for_each_safe(p, n, &timer->open_list_head) { 964 list_del_init(p); 965 ti = list_entry(p, struct snd_timer_instance, open_list); 966 ti->timer = NULL; 967 } 968 } 969 list_del(&timer->device_list); 970 mutex_unlock(®ister_mutex); 971 972 if (timer->private_free) 973 timer->private_free(timer); 974 kfree(timer); 975 return 0; 976 } 977 978 static int snd_timer_dev_free(struct snd_device *device) 979 { 980 struct snd_timer *timer = device->device_data; 981 return snd_timer_free(timer); 982 } 983 984 static int snd_timer_dev_register(struct snd_device *dev) 985 { 986 struct snd_timer *timer = dev->device_data; 987 struct snd_timer *timer1; 988 989 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 990 return -ENXIO; 991 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 992 !timer->hw.resolution && timer->hw.c_resolution == NULL) 993 return -EINVAL; 994 995 mutex_lock(®ister_mutex); 996 list_for_each_entry(timer1, &snd_timer_list, device_list) { 997 if (timer1->tmr_class > timer->tmr_class) 998 break; 999 if (timer1->tmr_class < timer->tmr_class) 1000 continue; 1001 if (timer1->card && timer->card) { 1002 if (timer1->card->number > timer->card->number) 1003 break; 1004 if (timer1->card->number < timer->card->number) 1005 continue; 1006 } 1007 if (timer1->tmr_device > timer->tmr_device) 1008 break; 1009 if (timer1->tmr_device < timer->tmr_device) 1010 continue; 1011 if (timer1->tmr_subdevice > timer->tmr_subdevice) 1012 break; 1013 if (timer1->tmr_subdevice < timer->tmr_subdevice) 1014 continue; 1015 /* conflicts.. */ 1016 mutex_unlock(®ister_mutex); 1017 return -EBUSY; 1018 } 1019 list_add_tail(&timer->device_list, &timer1->device_list); 1020 mutex_unlock(®ister_mutex); 1021 return 0; 1022 } 1023 1024 static int snd_timer_dev_disconnect(struct snd_device *device) 1025 { 1026 struct snd_timer *timer = device->device_data; 1027 struct snd_timer_instance *ti; 1028 1029 mutex_lock(®ister_mutex); 1030 list_del_init(&timer->device_list); 1031 /* wake up pending sleepers */ 1032 list_for_each_entry(ti, &timer->open_list_head, open_list) { 1033 if (ti->disconnect) 1034 ti->disconnect(ti); 1035 } 1036 mutex_unlock(®ister_mutex); 1037 return 0; 1038 } 1039 1040 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 1041 { 1042 unsigned long flags; 1043 unsigned long resolution = 0; 1044 struct snd_timer_instance *ti, *ts; 1045 1046 if (timer->card && timer->card->shutdown) 1047 return; 1048 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 1049 return; 1050 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 1051 event > SNDRV_TIMER_EVENT_MRESUME)) 1052 return; 1053 spin_lock_irqsave(&timer->lock, flags); 1054 if (event == SNDRV_TIMER_EVENT_MSTART || 1055 event == SNDRV_TIMER_EVENT_MCONTINUE || 1056 event == SNDRV_TIMER_EVENT_MRESUME) 1057 resolution = snd_timer_hw_resolution(timer); 1058 list_for_each_entry(ti, &timer->active_list_head, active_list) { 1059 if (ti->ccallback) 1060 ti->ccallback(ti, event, tstamp, resolution); 1061 list_for_each_entry(ts, &ti->slave_active_head, active_list) 1062 if (ts->ccallback) 1063 ts->ccallback(ts, event, tstamp, resolution); 1064 } 1065 spin_unlock_irqrestore(&timer->lock, flags); 1066 } 1067 EXPORT_SYMBOL(snd_timer_notify); 1068 1069 /* 1070 * exported functions for global timers 1071 */ 1072 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 1073 { 1074 struct snd_timer_id tid; 1075 1076 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 1077 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1078 tid.card = -1; 1079 tid.device = device; 1080 tid.subdevice = 0; 1081 return snd_timer_new(NULL, id, &tid, rtimer); 1082 } 1083 EXPORT_SYMBOL(snd_timer_global_new); 1084 1085 int snd_timer_global_free(struct snd_timer *timer) 1086 { 1087 return snd_timer_free(timer); 1088 } 1089 EXPORT_SYMBOL(snd_timer_global_free); 1090 1091 int snd_timer_global_register(struct snd_timer *timer) 1092 { 1093 struct snd_device dev; 1094 1095 memset(&dev, 0, sizeof(dev)); 1096 dev.device_data = timer; 1097 return snd_timer_dev_register(&dev); 1098 } 1099 EXPORT_SYMBOL(snd_timer_global_register); 1100 1101 /* 1102 * System timer 1103 */ 1104 1105 struct snd_timer_system_private { 1106 struct timer_list tlist; 1107 struct snd_timer *snd_timer; 1108 unsigned long last_expires; 1109 unsigned long last_jiffies; 1110 unsigned long correction; 1111 }; 1112 1113 static void snd_timer_s_function(struct timer_list *t) 1114 { 1115 struct snd_timer_system_private *priv = from_timer(priv, t, 1116 tlist); 1117 struct snd_timer *timer = priv->snd_timer; 1118 unsigned long jiff = jiffies; 1119 if (time_after(jiff, priv->last_expires)) 1120 priv->correction += (long)jiff - (long)priv->last_expires; 1121 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1122 } 1123 1124 static int snd_timer_s_start(struct snd_timer * timer) 1125 { 1126 struct snd_timer_system_private *priv; 1127 unsigned long njiff; 1128 1129 priv = (struct snd_timer_system_private *) timer->private_data; 1130 njiff = (priv->last_jiffies = jiffies); 1131 if (priv->correction > timer->sticks - 1) { 1132 priv->correction -= timer->sticks - 1; 1133 njiff++; 1134 } else { 1135 njiff += timer->sticks - priv->correction; 1136 priv->correction = 0; 1137 } 1138 priv->last_expires = njiff; 1139 mod_timer(&priv->tlist, njiff); 1140 return 0; 1141 } 1142 1143 static int snd_timer_s_stop(struct snd_timer * timer) 1144 { 1145 struct snd_timer_system_private *priv; 1146 unsigned long jiff; 1147 1148 priv = (struct snd_timer_system_private *) timer->private_data; 1149 del_timer(&priv->tlist); 1150 jiff = jiffies; 1151 if (time_before(jiff, priv->last_expires)) 1152 timer->sticks = priv->last_expires - jiff; 1153 else 1154 timer->sticks = 1; 1155 priv->correction = 0; 1156 return 0; 1157 } 1158 1159 static int snd_timer_s_close(struct snd_timer *timer) 1160 { 1161 struct snd_timer_system_private *priv; 1162 1163 priv = (struct snd_timer_system_private *)timer->private_data; 1164 del_timer_sync(&priv->tlist); 1165 return 0; 1166 } 1167 1168 static struct snd_timer_hardware snd_timer_system = 1169 { 1170 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1171 .resolution = 1000000000L / HZ, 1172 .ticks = 10000000L, 1173 .close = snd_timer_s_close, 1174 .start = snd_timer_s_start, 1175 .stop = snd_timer_s_stop 1176 }; 1177 1178 static void snd_timer_free_system(struct snd_timer *timer) 1179 { 1180 kfree(timer->private_data); 1181 } 1182 1183 static int snd_timer_register_system(void) 1184 { 1185 struct snd_timer *timer; 1186 struct snd_timer_system_private *priv; 1187 int err; 1188 1189 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1190 if (err < 0) 1191 return err; 1192 strcpy(timer->name, "system timer"); 1193 timer->hw = snd_timer_system; 1194 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1195 if (priv == NULL) { 1196 snd_timer_free(timer); 1197 return -ENOMEM; 1198 } 1199 priv->snd_timer = timer; 1200 timer_setup(&priv->tlist, snd_timer_s_function, 0); 1201 timer->private_data = priv; 1202 timer->private_free = snd_timer_free_system; 1203 return snd_timer_global_register(timer); 1204 } 1205 1206 #ifdef CONFIG_SND_PROC_FS 1207 /* 1208 * Info interface 1209 */ 1210 1211 static void snd_timer_proc_read(struct snd_info_entry *entry, 1212 struct snd_info_buffer *buffer) 1213 { 1214 struct snd_timer *timer; 1215 struct snd_timer_instance *ti; 1216 1217 mutex_lock(®ister_mutex); 1218 list_for_each_entry(timer, &snd_timer_list, device_list) { 1219 if (timer->card && timer->card->shutdown) 1220 continue; 1221 switch (timer->tmr_class) { 1222 case SNDRV_TIMER_CLASS_GLOBAL: 1223 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1224 break; 1225 case SNDRV_TIMER_CLASS_CARD: 1226 snd_iprintf(buffer, "C%i-%i: ", 1227 timer->card->number, timer->tmr_device); 1228 break; 1229 case SNDRV_TIMER_CLASS_PCM: 1230 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1231 timer->tmr_device, timer->tmr_subdevice); 1232 break; 1233 default: 1234 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1235 timer->card ? timer->card->number : -1, 1236 timer->tmr_device, timer->tmr_subdevice); 1237 } 1238 snd_iprintf(buffer, "%s :", timer->name); 1239 if (timer->hw.resolution) 1240 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1241 timer->hw.resolution / 1000, 1242 timer->hw.resolution % 1000, 1243 timer->hw.ticks); 1244 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1245 snd_iprintf(buffer, " SLAVE"); 1246 snd_iprintf(buffer, "\n"); 1247 list_for_each_entry(ti, &timer->open_list_head, open_list) 1248 snd_iprintf(buffer, " Client %s : %s\n", 1249 ti->owner ? ti->owner : "unknown", 1250 ti->flags & (SNDRV_TIMER_IFLG_START | 1251 SNDRV_TIMER_IFLG_RUNNING) 1252 ? "running" : "stopped"); 1253 } 1254 mutex_unlock(®ister_mutex); 1255 } 1256 1257 static struct snd_info_entry *snd_timer_proc_entry; 1258 1259 static void __init snd_timer_proc_init(void) 1260 { 1261 struct snd_info_entry *entry; 1262 1263 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1264 if (entry != NULL) { 1265 entry->c.text.read = snd_timer_proc_read; 1266 if (snd_info_register(entry) < 0) { 1267 snd_info_free_entry(entry); 1268 entry = NULL; 1269 } 1270 } 1271 snd_timer_proc_entry = entry; 1272 } 1273 1274 static void __exit snd_timer_proc_done(void) 1275 { 1276 snd_info_free_entry(snd_timer_proc_entry); 1277 } 1278 #else /* !CONFIG_SND_PROC_FS */ 1279 #define snd_timer_proc_init() 1280 #define snd_timer_proc_done() 1281 #endif 1282 1283 /* 1284 * USER SPACE interface 1285 */ 1286 1287 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1288 unsigned long resolution, 1289 unsigned long ticks) 1290 { 1291 struct snd_timer_user *tu = timeri->callback_data; 1292 struct snd_timer_read *r; 1293 int prev; 1294 1295 spin_lock(&tu->qlock); 1296 if (tu->qused > 0) { 1297 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1298 r = &tu->queue[prev]; 1299 if (r->resolution == resolution) { 1300 r->ticks += ticks; 1301 goto __wake; 1302 } 1303 } 1304 if (tu->qused >= tu->queue_size) { 1305 tu->overrun++; 1306 } else { 1307 r = &tu->queue[tu->qtail++]; 1308 tu->qtail %= tu->queue_size; 1309 r->resolution = resolution; 1310 r->ticks = ticks; 1311 tu->qused++; 1312 } 1313 __wake: 1314 spin_unlock(&tu->qlock); 1315 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1316 wake_up(&tu->qchange_sleep); 1317 } 1318 1319 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1320 struct snd_timer_tread *tread) 1321 { 1322 if (tu->qused >= tu->queue_size) { 1323 tu->overrun++; 1324 } else { 1325 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1326 tu->qtail %= tu->queue_size; 1327 tu->qused++; 1328 } 1329 } 1330 1331 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1332 int event, 1333 struct timespec *tstamp, 1334 unsigned long resolution) 1335 { 1336 struct snd_timer_user *tu = timeri->callback_data; 1337 struct snd_timer_tread r1; 1338 unsigned long flags; 1339 1340 if (event >= SNDRV_TIMER_EVENT_START && 1341 event <= SNDRV_TIMER_EVENT_PAUSE) 1342 tu->tstamp = *tstamp; 1343 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1344 return; 1345 memset(&r1, 0, sizeof(r1)); 1346 r1.event = event; 1347 r1.tstamp = *tstamp; 1348 r1.val = resolution; 1349 spin_lock_irqsave(&tu->qlock, flags); 1350 snd_timer_user_append_to_tqueue(tu, &r1); 1351 spin_unlock_irqrestore(&tu->qlock, flags); 1352 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1353 wake_up(&tu->qchange_sleep); 1354 } 1355 1356 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1357 { 1358 struct snd_timer_user *tu = timeri->callback_data; 1359 1360 tu->disconnected = true; 1361 wake_up(&tu->qchange_sleep); 1362 } 1363 1364 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1365 unsigned long resolution, 1366 unsigned long ticks) 1367 { 1368 struct snd_timer_user *tu = timeri->callback_data; 1369 struct snd_timer_tread *r, r1; 1370 struct timespec tstamp; 1371 int prev, append = 0; 1372 1373 memset(&r1, 0, sizeof(r1)); 1374 memset(&tstamp, 0, sizeof(tstamp)); 1375 spin_lock(&tu->qlock); 1376 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1377 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1378 spin_unlock(&tu->qlock); 1379 return; 1380 } 1381 if (tu->last_resolution != resolution || ticks > 0) { 1382 if (timer_tstamp_monotonic) 1383 ktime_get_ts(&tstamp); 1384 else 1385 getnstimeofday(&tstamp); 1386 } 1387 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1388 tu->last_resolution != resolution) { 1389 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1390 r1.tstamp = tstamp; 1391 r1.val = resolution; 1392 snd_timer_user_append_to_tqueue(tu, &r1); 1393 tu->last_resolution = resolution; 1394 append++; 1395 } 1396 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1397 goto __wake; 1398 if (ticks == 0) 1399 goto __wake; 1400 if (tu->qused > 0) { 1401 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1402 r = &tu->tqueue[prev]; 1403 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1404 r->tstamp = tstamp; 1405 r->val += ticks; 1406 append++; 1407 goto __wake; 1408 } 1409 } 1410 r1.event = SNDRV_TIMER_EVENT_TICK; 1411 r1.tstamp = tstamp; 1412 r1.val = ticks; 1413 snd_timer_user_append_to_tqueue(tu, &r1); 1414 append++; 1415 __wake: 1416 spin_unlock(&tu->qlock); 1417 if (append == 0) 1418 return; 1419 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1420 wake_up(&tu->qchange_sleep); 1421 } 1422 1423 static int realloc_user_queue(struct snd_timer_user *tu, int size) 1424 { 1425 struct snd_timer_read *queue = NULL; 1426 struct snd_timer_tread *tqueue = NULL; 1427 1428 if (tu->tread) { 1429 tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL); 1430 if (!tqueue) 1431 return -ENOMEM; 1432 } else { 1433 queue = kcalloc(size, sizeof(*queue), GFP_KERNEL); 1434 if (!queue) 1435 return -ENOMEM; 1436 } 1437 1438 spin_lock_irq(&tu->qlock); 1439 kfree(tu->queue); 1440 kfree(tu->tqueue); 1441 tu->queue_size = size; 1442 tu->queue = queue; 1443 tu->tqueue = tqueue; 1444 tu->qhead = tu->qtail = tu->qused = 0; 1445 spin_unlock_irq(&tu->qlock); 1446 1447 return 0; 1448 } 1449 1450 static int snd_timer_user_open(struct inode *inode, struct file *file) 1451 { 1452 struct snd_timer_user *tu; 1453 int err; 1454 1455 err = stream_open(inode, file); 1456 if (err < 0) 1457 return err; 1458 1459 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1460 if (tu == NULL) 1461 return -ENOMEM; 1462 spin_lock_init(&tu->qlock); 1463 init_waitqueue_head(&tu->qchange_sleep); 1464 mutex_init(&tu->ioctl_lock); 1465 tu->ticks = 1; 1466 if (realloc_user_queue(tu, 128) < 0) { 1467 kfree(tu); 1468 return -ENOMEM; 1469 } 1470 file->private_data = tu; 1471 return 0; 1472 } 1473 1474 static int snd_timer_user_release(struct inode *inode, struct file *file) 1475 { 1476 struct snd_timer_user *tu; 1477 1478 if (file->private_data) { 1479 tu = file->private_data; 1480 file->private_data = NULL; 1481 mutex_lock(&tu->ioctl_lock); 1482 if (tu->timeri) 1483 snd_timer_close(tu->timeri); 1484 mutex_unlock(&tu->ioctl_lock); 1485 kfree(tu->queue); 1486 kfree(tu->tqueue); 1487 kfree(tu); 1488 } 1489 return 0; 1490 } 1491 1492 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1493 { 1494 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1495 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1496 id->card = -1; 1497 id->device = -1; 1498 id->subdevice = -1; 1499 } 1500 1501 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1502 { 1503 id->dev_class = timer->tmr_class; 1504 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1505 id->card = timer->card ? timer->card->number : -1; 1506 id->device = timer->tmr_device; 1507 id->subdevice = timer->tmr_subdevice; 1508 } 1509 1510 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1511 { 1512 struct snd_timer_id id; 1513 struct snd_timer *timer; 1514 struct list_head *p; 1515 1516 if (copy_from_user(&id, _tid, sizeof(id))) 1517 return -EFAULT; 1518 mutex_lock(®ister_mutex); 1519 if (id.dev_class < 0) { /* first item */ 1520 if (list_empty(&snd_timer_list)) 1521 snd_timer_user_zero_id(&id); 1522 else { 1523 timer = list_entry(snd_timer_list.next, 1524 struct snd_timer, device_list); 1525 snd_timer_user_copy_id(&id, timer); 1526 } 1527 } else { 1528 switch (id.dev_class) { 1529 case SNDRV_TIMER_CLASS_GLOBAL: 1530 id.device = id.device < 0 ? 0 : id.device + 1; 1531 list_for_each(p, &snd_timer_list) { 1532 timer = list_entry(p, struct snd_timer, device_list); 1533 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1534 snd_timer_user_copy_id(&id, timer); 1535 break; 1536 } 1537 if (timer->tmr_device >= id.device) { 1538 snd_timer_user_copy_id(&id, timer); 1539 break; 1540 } 1541 } 1542 if (p == &snd_timer_list) 1543 snd_timer_user_zero_id(&id); 1544 break; 1545 case SNDRV_TIMER_CLASS_CARD: 1546 case SNDRV_TIMER_CLASS_PCM: 1547 if (id.card < 0) { 1548 id.card = 0; 1549 } else { 1550 if (id.device < 0) { 1551 id.device = 0; 1552 } else { 1553 if (id.subdevice < 0) 1554 id.subdevice = 0; 1555 else if (id.subdevice < INT_MAX) 1556 id.subdevice++; 1557 } 1558 } 1559 list_for_each(p, &snd_timer_list) { 1560 timer = list_entry(p, struct snd_timer, device_list); 1561 if (timer->tmr_class > id.dev_class) { 1562 snd_timer_user_copy_id(&id, timer); 1563 break; 1564 } 1565 if (timer->tmr_class < id.dev_class) 1566 continue; 1567 if (timer->card->number > id.card) { 1568 snd_timer_user_copy_id(&id, timer); 1569 break; 1570 } 1571 if (timer->card->number < id.card) 1572 continue; 1573 if (timer->tmr_device > id.device) { 1574 snd_timer_user_copy_id(&id, timer); 1575 break; 1576 } 1577 if (timer->tmr_device < id.device) 1578 continue; 1579 if (timer->tmr_subdevice > id.subdevice) { 1580 snd_timer_user_copy_id(&id, timer); 1581 break; 1582 } 1583 if (timer->tmr_subdevice < id.subdevice) 1584 continue; 1585 snd_timer_user_copy_id(&id, timer); 1586 break; 1587 } 1588 if (p == &snd_timer_list) 1589 snd_timer_user_zero_id(&id); 1590 break; 1591 default: 1592 snd_timer_user_zero_id(&id); 1593 } 1594 } 1595 mutex_unlock(®ister_mutex); 1596 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1597 return -EFAULT; 1598 return 0; 1599 } 1600 1601 static int snd_timer_user_ginfo(struct file *file, 1602 struct snd_timer_ginfo __user *_ginfo) 1603 { 1604 struct snd_timer_ginfo *ginfo; 1605 struct snd_timer_id tid; 1606 struct snd_timer *t; 1607 struct list_head *p; 1608 int err = 0; 1609 1610 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1611 if (IS_ERR(ginfo)) 1612 return PTR_ERR(ginfo); 1613 1614 tid = ginfo->tid; 1615 memset(ginfo, 0, sizeof(*ginfo)); 1616 ginfo->tid = tid; 1617 mutex_lock(®ister_mutex); 1618 t = snd_timer_find(&tid); 1619 if (t != NULL) { 1620 ginfo->card = t->card ? t->card->number : -1; 1621 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1622 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1623 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1624 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1625 ginfo->resolution = t->hw.resolution; 1626 if (t->hw.resolution_min > 0) { 1627 ginfo->resolution_min = t->hw.resolution_min; 1628 ginfo->resolution_max = t->hw.resolution_max; 1629 } 1630 list_for_each(p, &t->open_list_head) { 1631 ginfo->clients++; 1632 } 1633 } else { 1634 err = -ENODEV; 1635 } 1636 mutex_unlock(®ister_mutex); 1637 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1638 err = -EFAULT; 1639 kfree(ginfo); 1640 return err; 1641 } 1642 1643 static int timer_set_gparams(struct snd_timer_gparams *gparams) 1644 { 1645 struct snd_timer *t; 1646 int err; 1647 1648 mutex_lock(®ister_mutex); 1649 t = snd_timer_find(&gparams->tid); 1650 if (!t) { 1651 err = -ENODEV; 1652 goto _error; 1653 } 1654 if (!list_empty(&t->open_list_head)) { 1655 err = -EBUSY; 1656 goto _error; 1657 } 1658 if (!t->hw.set_period) { 1659 err = -ENOSYS; 1660 goto _error; 1661 } 1662 err = t->hw.set_period(t, gparams->period_num, gparams->period_den); 1663 _error: 1664 mutex_unlock(®ister_mutex); 1665 return err; 1666 } 1667 1668 static int snd_timer_user_gparams(struct file *file, 1669 struct snd_timer_gparams __user *_gparams) 1670 { 1671 struct snd_timer_gparams gparams; 1672 1673 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1674 return -EFAULT; 1675 return timer_set_gparams(&gparams); 1676 } 1677 1678 static int snd_timer_user_gstatus(struct file *file, 1679 struct snd_timer_gstatus __user *_gstatus) 1680 { 1681 struct snd_timer_gstatus gstatus; 1682 struct snd_timer_id tid; 1683 struct snd_timer *t; 1684 int err = 0; 1685 1686 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1687 return -EFAULT; 1688 tid = gstatus.tid; 1689 memset(&gstatus, 0, sizeof(gstatus)); 1690 gstatus.tid = tid; 1691 mutex_lock(®ister_mutex); 1692 t = snd_timer_find(&tid); 1693 if (t != NULL) { 1694 spin_lock_irq(&t->lock); 1695 gstatus.resolution = snd_timer_hw_resolution(t); 1696 if (t->hw.precise_resolution) { 1697 t->hw.precise_resolution(t, &gstatus.resolution_num, 1698 &gstatus.resolution_den); 1699 } else { 1700 gstatus.resolution_num = gstatus.resolution; 1701 gstatus.resolution_den = 1000000000uL; 1702 } 1703 spin_unlock_irq(&t->lock); 1704 } else { 1705 err = -ENODEV; 1706 } 1707 mutex_unlock(®ister_mutex); 1708 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1709 err = -EFAULT; 1710 return err; 1711 } 1712 1713 static int snd_timer_user_tselect(struct file *file, 1714 struct snd_timer_select __user *_tselect) 1715 { 1716 struct snd_timer_user *tu; 1717 struct snd_timer_select tselect; 1718 char str[32]; 1719 int err = 0; 1720 1721 tu = file->private_data; 1722 if (tu->timeri) { 1723 snd_timer_close(tu->timeri); 1724 tu->timeri = NULL; 1725 } 1726 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1727 err = -EFAULT; 1728 goto __err; 1729 } 1730 sprintf(str, "application %i", current->pid); 1731 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1732 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1733 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1734 if (err < 0) 1735 goto __err; 1736 1737 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1738 tu->timeri->callback = tu->tread 1739 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1740 tu->timeri->ccallback = snd_timer_user_ccallback; 1741 tu->timeri->callback_data = (void *)tu; 1742 tu->timeri->disconnect = snd_timer_user_disconnect; 1743 1744 __err: 1745 return err; 1746 } 1747 1748 static int snd_timer_user_info(struct file *file, 1749 struct snd_timer_info __user *_info) 1750 { 1751 struct snd_timer_user *tu; 1752 struct snd_timer_info *info; 1753 struct snd_timer *t; 1754 int err = 0; 1755 1756 tu = file->private_data; 1757 if (!tu->timeri) 1758 return -EBADFD; 1759 t = tu->timeri->timer; 1760 if (!t) 1761 return -EBADFD; 1762 1763 info = kzalloc(sizeof(*info), GFP_KERNEL); 1764 if (! info) 1765 return -ENOMEM; 1766 info->card = t->card ? t->card->number : -1; 1767 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1768 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1769 strlcpy(info->id, t->id, sizeof(info->id)); 1770 strlcpy(info->name, t->name, sizeof(info->name)); 1771 info->resolution = t->hw.resolution; 1772 if (copy_to_user(_info, info, sizeof(*_info))) 1773 err = -EFAULT; 1774 kfree(info); 1775 return err; 1776 } 1777 1778 static int snd_timer_user_params(struct file *file, 1779 struct snd_timer_params __user *_params) 1780 { 1781 struct snd_timer_user *tu; 1782 struct snd_timer_params params; 1783 struct snd_timer *t; 1784 int err; 1785 1786 tu = file->private_data; 1787 if (!tu->timeri) 1788 return -EBADFD; 1789 t = tu->timeri->timer; 1790 if (!t) 1791 return -EBADFD; 1792 if (copy_from_user(¶ms, _params, sizeof(params))) 1793 return -EFAULT; 1794 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) { 1795 u64 resolution; 1796 1797 if (params.ticks < 1) { 1798 err = -EINVAL; 1799 goto _end; 1800 } 1801 1802 /* Don't allow resolution less than 1ms */ 1803 resolution = snd_timer_resolution(tu->timeri); 1804 resolution *= params.ticks; 1805 if (resolution < 1000000) { 1806 err = -EINVAL; 1807 goto _end; 1808 } 1809 } 1810 if (params.queue_size > 0 && 1811 (params.queue_size < 32 || params.queue_size > 1024)) { 1812 err = -EINVAL; 1813 goto _end; 1814 } 1815 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1816 (1<<SNDRV_TIMER_EVENT_TICK)| 1817 (1<<SNDRV_TIMER_EVENT_START)| 1818 (1<<SNDRV_TIMER_EVENT_STOP)| 1819 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1820 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1821 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1822 (1<<SNDRV_TIMER_EVENT_RESUME)| 1823 (1<<SNDRV_TIMER_EVENT_MSTART)| 1824 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1825 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1826 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1827 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1828 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1829 err = -EINVAL; 1830 goto _end; 1831 } 1832 snd_timer_stop(tu->timeri); 1833 spin_lock_irq(&t->lock); 1834 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1835 SNDRV_TIMER_IFLG_EXCLUSIVE| 1836 SNDRV_TIMER_IFLG_EARLY_EVENT); 1837 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1838 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1839 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1840 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1841 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1842 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1843 spin_unlock_irq(&t->lock); 1844 if (params.queue_size > 0 && 1845 (unsigned int)tu->queue_size != params.queue_size) { 1846 err = realloc_user_queue(tu, params.queue_size); 1847 if (err < 0) 1848 goto _end; 1849 } 1850 spin_lock_irq(&tu->qlock); 1851 tu->qhead = tu->qtail = tu->qused = 0; 1852 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1853 if (tu->tread) { 1854 struct snd_timer_tread tread; 1855 memset(&tread, 0, sizeof(tread)); 1856 tread.event = SNDRV_TIMER_EVENT_EARLY; 1857 tread.tstamp.tv_sec = 0; 1858 tread.tstamp.tv_nsec = 0; 1859 tread.val = 0; 1860 snd_timer_user_append_to_tqueue(tu, &tread); 1861 } else { 1862 struct snd_timer_read *r = &tu->queue[0]; 1863 r->resolution = 0; 1864 r->ticks = 0; 1865 tu->qused++; 1866 tu->qtail++; 1867 } 1868 } 1869 tu->filter = params.filter; 1870 tu->ticks = params.ticks; 1871 spin_unlock_irq(&tu->qlock); 1872 err = 0; 1873 _end: 1874 if (copy_to_user(_params, ¶ms, sizeof(params))) 1875 return -EFAULT; 1876 return err; 1877 } 1878 1879 static int snd_timer_user_status(struct file *file, 1880 struct snd_timer_status __user *_status) 1881 { 1882 struct snd_timer_user *tu; 1883 struct snd_timer_status status; 1884 1885 tu = file->private_data; 1886 if (!tu->timeri) 1887 return -EBADFD; 1888 memset(&status, 0, sizeof(status)); 1889 status.tstamp = tu->tstamp; 1890 status.resolution = snd_timer_resolution(tu->timeri); 1891 status.lost = tu->timeri->lost; 1892 status.overrun = tu->overrun; 1893 spin_lock_irq(&tu->qlock); 1894 status.queue = tu->qused; 1895 spin_unlock_irq(&tu->qlock); 1896 if (copy_to_user(_status, &status, sizeof(status))) 1897 return -EFAULT; 1898 return 0; 1899 } 1900 1901 static int snd_timer_user_start(struct file *file) 1902 { 1903 int err; 1904 struct snd_timer_user *tu; 1905 1906 tu = file->private_data; 1907 if (!tu->timeri) 1908 return -EBADFD; 1909 snd_timer_stop(tu->timeri); 1910 tu->timeri->lost = 0; 1911 tu->last_resolution = 0; 1912 err = snd_timer_start(tu->timeri, tu->ticks); 1913 if (err < 0) 1914 return err; 1915 return 0; 1916 } 1917 1918 static int snd_timer_user_stop(struct file *file) 1919 { 1920 int err; 1921 struct snd_timer_user *tu; 1922 1923 tu = file->private_data; 1924 if (!tu->timeri) 1925 return -EBADFD; 1926 err = snd_timer_stop(tu->timeri); 1927 if (err < 0) 1928 return err; 1929 return 0; 1930 } 1931 1932 static int snd_timer_user_continue(struct file *file) 1933 { 1934 int err; 1935 struct snd_timer_user *tu; 1936 1937 tu = file->private_data; 1938 if (!tu->timeri) 1939 return -EBADFD; 1940 /* start timer instead of continue if it's not used before */ 1941 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) 1942 return snd_timer_user_start(file); 1943 tu->timeri->lost = 0; 1944 err = snd_timer_continue(tu->timeri); 1945 if (err < 0) 1946 return err; 1947 return 0; 1948 } 1949 1950 static int snd_timer_user_pause(struct file *file) 1951 { 1952 int err; 1953 struct snd_timer_user *tu; 1954 1955 tu = file->private_data; 1956 if (!tu->timeri) 1957 return -EBADFD; 1958 err = snd_timer_pause(tu->timeri); 1959 if (err < 0) 1960 return err; 1961 return 0; 1962 } 1963 1964 enum { 1965 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1966 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1967 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1968 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1969 }; 1970 1971 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1972 unsigned long arg) 1973 { 1974 struct snd_timer_user *tu; 1975 void __user *argp = (void __user *)arg; 1976 int __user *p = argp; 1977 1978 tu = file->private_data; 1979 switch (cmd) { 1980 case SNDRV_TIMER_IOCTL_PVERSION: 1981 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1982 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1983 return snd_timer_user_next_device(argp); 1984 case SNDRV_TIMER_IOCTL_TREAD: 1985 { 1986 int xarg, old_tread; 1987 1988 if (tu->timeri) /* too late */ 1989 return -EBUSY; 1990 if (get_user(xarg, p)) 1991 return -EFAULT; 1992 old_tread = tu->tread; 1993 tu->tread = xarg ? 1 : 0; 1994 if (tu->tread != old_tread && 1995 realloc_user_queue(tu, tu->queue_size) < 0) { 1996 tu->tread = old_tread; 1997 return -ENOMEM; 1998 } 1999 return 0; 2000 } 2001 case SNDRV_TIMER_IOCTL_GINFO: 2002 return snd_timer_user_ginfo(file, argp); 2003 case SNDRV_TIMER_IOCTL_GPARAMS: 2004 return snd_timer_user_gparams(file, argp); 2005 case SNDRV_TIMER_IOCTL_GSTATUS: 2006 return snd_timer_user_gstatus(file, argp); 2007 case SNDRV_TIMER_IOCTL_SELECT: 2008 return snd_timer_user_tselect(file, argp); 2009 case SNDRV_TIMER_IOCTL_INFO: 2010 return snd_timer_user_info(file, argp); 2011 case SNDRV_TIMER_IOCTL_PARAMS: 2012 return snd_timer_user_params(file, argp); 2013 case SNDRV_TIMER_IOCTL_STATUS: 2014 return snd_timer_user_status(file, argp); 2015 case SNDRV_TIMER_IOCTL_START: 2016 case SNDRV_TIMER_IOCTL_START_OLD: 2017 return snd_timer_user_start(file); 2018 case SNDRV_TIMER_IOCTL_STOP: 2019 case SNDRV_TIMER_IOCTL_STOP_OLD: 2020 return snd_timer_user_stop(file); 2021 case SNDRV_TIMER_IOCTL_CONTINUE: 2022 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 2023 return snd_timer_user_continue(file); 2024 case SNDRV_TIMER_IOCTL_PAUSE: 2025 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 2026 return snd_timer_user_pause(file); 2027 } 2028 return -ENOTTY; 2029 } 2030 2031 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 2032 unsigned long arg) 2033 { 2034 struct snd_timer_user *tu = file->private_data; 2035 long ret; 2036 2037 mutex_lock(&tu->ioctl_lock); 2038 ret = __snd_timer_user_ioctl(file, cmd, arg); 2039 mutex_unlock(&tu->ioctl_lock); 2040 return ret; 2041 } 2042 2043 static int snd_timer_user_fasync(int fd, struct file * file, int on) 2044 { 2045 struct snd_timer_user *tu; 2046 2047 tu = file->private_data; 2048 return fasync_helper(fd, file, on, &tu->fasync); 2049 } 2050 2051 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 2052 size_t count, loff_t *offset) 2053 { 2054 struct snd_timer_user *tu; 2055 long result = 0, unit; 2056 int qhead; 2057 int err = 0; 2058 2059 tu = file->private_data; 2060 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 2061 mutex_lock(&tu->ioctl_lock); 2062 spin_lock_irq(&tu->qlock); 2063 while ((long)count - result >= unit) { 2064 while (!tu->qused) { 2065 wait_queue_entry_t wait; 2066 2067 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 2068 err = -EAGAIN; 2069 goto _error; 2070 } 2071 2072 set_current_state(TASK_INTERRUPTIBLE); 2073 init_waitqueue_entry(&wait, current); 2074 add_wait_queue(&tu->qchange_sleep, &wait); 2075 2076 spin_unlock_irq(&tu->qlock); 2077 mutex_unlock(&tu->ioctl_lock); 2078 schedule(); 2079 mutex_lock(&tu->ioctl_lock); 2080 spin_lock_irq(&tu->qlock); 2081 2082 remove_wait_queue(&tu->qchange_sleep, &wait); 2083 2084 if (tu->disconnected) { 2085 err = -ENODEV; 2086 goto _error; 2087 } 2088 if (signal_pending(current)) { 2089 err = -ERESTARTSYS; 2090 goto _error; 2091 } 2092 } 2093 2094 qhead = tu->qhead++; 2095 tu->qhead %= tu->queue_size; 2096 tu->qused--; 2097 spin_unlock_irq(&tu->qlock); 2098 2099 if (tu->tread) { 2100 if (copy_to_user(buffer, &tu->tqueue[qhead], 2101 sizeof(struct snd_timer_tread))) 2102 err = -EFAULT; 2103 } else { 2104 if (copy_to_user(buffer, &tu->queue[qhead], 2105 sizeof(struct snd_timer_read))) 2106 err = -EFAULT; 2107 } 2108 2109 spin_lock_irq(&tu->qlock); 2110 if (err < 0) 2111 goto _error; 2112 result += unit; 2113 buffer += unit; 2114 } 2115 _error: 2116 spin_unlock_irq(&tu->qlock); 2117 mutex_unlock(&tu->ioctl_lock); 2118 return result > 0 ? result : err; 2119 } 2120 2121 static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait) 2122 { 2123 __poll_t mask; 2124 struct snd_timer_user *tu; 2125 2126 tu = file->private_data; 2127 2128 poll_wait(file, &tu->qchange_sleep, wait); 2129 2130 mask = 0; 2131 spin_lock_irq(&tu->qlock); 2132 if (tu->qused) 2133 mask |= EPOLLIN | EPOLLRDNORM; 2134 if (tu->disconnected) 2135 mask |= EPOLLERR; 2136 spin_unlock_irq(&tu->qlock); 2137 2138 return mask; 2139 } 2140 2141 #ifdef CONFIG_COMPAT 2142 #include "timer_compat.c" 2143 #else 2144 #define snd_timer_user_ioctl_compat NULL 2145 #endif 2146 2147 static const struct file_operations snd_timer_f_ops = 2148 { 2149 .owner = THIS_MODULE, 2150 .read = snd_timer_user_read, 2151 .open = snd_timer_user_open, 2152 .release = snd_timer_user_release, 2153 .llseek = no_llseek, 2154 .poll = snd_timer_user_poll, 2155 .unlocked_ioctl = snd_timer_user_ioctl, 2156 .compat_ioctl = snd_timer_user_ioctl_compat, 2157 .fasync = snd_timer_user_fasync, 2158 }; 2159 2160 /* unregister the system timer */ 2161 static void snd_timer_free_all(void) 2162 { 2163 struct snd_timer *timer, *n; 2164 2165 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2166 snd_timer_free(timer); 2167 } 2168 2169 static struct device timer_dev; 2170 2171 /* 2172 * ENTRY functions 2173 */ 2174 2175 static int __init alsa_timer_init(void) 2176 { 2177 int err; 2178 2179 snd_device_initialize(&timer_dev, NULL); 2180 dev_set_name(&timer_dev, "timer"); 2181 2182 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2183 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2184 "system timer"); 2185 #endif 2186 2187 err = snd_timer_register_system(); 2188 if (err < 0) { 2189 pr_err("ALSA: unable to register system timer (%i)\n", err); 2190 goto put_timer; 2191 } 2192 2193 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2194 &snd_timer_f_ops, NULL, &timer_dev); 2195 if (err < 0) { 2196 pr_err("ALSA: unable to register timer device (%i)\n", err); 2197 snd_timer_free_all(); 2198 goto put_timer; 2199 } 2200 2201 snd_timer_proc_init(); 2202 return 0; 2203 2204 put_timer: 2205 put_device(&timer_dev); 2206 return err; 2207 } 2208 2209 static void __exit alsa_timer_exit(void) 2210 { 2211 snd_unregister_device(&timer_dev); 2212 snd_timer_free_all(); 2213 put_device(&timer_dev); 2214 snd_timer_proc_done(); 2215 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2216 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2217 #endif 2218 } 2219 2220 module_init(alsa_timer_init) 2221 module_exit(alsa_timer_exit) 2222