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