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