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 void 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 list_move_tail(&slave->open_list, 194 &master->slave_list_head); 195 spin_lock_irq(&slave_active_lock); 196 slave->master = master; 197 slave->timer = master->timer; 198 spin_unlock_irq(&slave_active_lock); 199 return; 200 } 201 } 202 } 203 } 204 205 /* 206 * look for slave instances matching with the slave id of the given master. 207 * when found, relink the open_link of slaves. 208 * 209 * call this with register_mutex down. 210 */ 211 static void snd_timer_check_master(struct snd_timer_instance *master) 212 { 213 struct snd_timer_instance *slave, *tmp; 214 215 /* check all pending slaves */ 216 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 217 if (slave->slave_class == master->slave_class && 218 slave->slave_id == master->slave_id) { 219 list_move_tail(&slave->open_list, &master->slave_list_head); 220 spin_lock_irq(&slave_active_lock); 221 spin_lock(&master->timer->lock); 222 slave->master = master; 223 slave->timer = master->timer; 224 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 225 list_add_tail(&slave->active_list, 226 &master->slave_active_head); 227 spin_unlock(&master->timer->lock); 228 spin_unlock_irq(&slave_active_lock); 229 } 230 } 231 } 232 233 /* 234 * open a timer instance 235 * when opening a master, the slave id must be here given. 236 */ 237 int snd_timer_open(struct snd_timer_instance **ti, 238 char *owner, struct snd_timer_id *tid, 239 unsigned int slave_id) 240 { 241 struct snd_timer *timer; 242 struct snd_timer_instance *timeri = NULL; 243 244 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 245 /* open a slave instance */ 246 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 247 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 248 pr_debug("ALSA: timer: invalid slave class %i\n", 249 tid->dev_sclass); 250 return -EINVAL; 251 } 252 mutex_lock(®ister_mutex); 253 timeri = snd_timer_instance_new(owner, NULL); 254 if (!timeri) { 255 mutex_unlock(®ister_mutex); 256 return -ENOMEM; 257 } 258 timeri->slave_class = tid->dev_sclass; 259 timeri->slave_id = tid->device; 260 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 261 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 262 snd_timer_check_slave(timeri); 263 mutex_unlock(®ister_mutex); 264 *ti = timeri; 265 return 0; 266 } 267 268 /* open a master instance */ 269 mutex_lock(®ister_mutex); 270 timer = snd_timer_find(tid); 271 #ifdef CONFIG_MODULES 272 if (!timer) { 273 mutex_unlock(®ister_mutex); 274 snd_timer_request(tid); 275 mutex_lock(®ister_mutex); 276 timer = snd_timer_find(tid); 277 } 278 #endif 279 if (!timer) { 280 mutex_unlock(®ister_mutex); 281 return -ENODEV; 282 } 283 if (!list_empty(&timer->open_list_head)) { 284 timeri = list_entry(timer->open_list_head.next, 285 struct snd_timer_instance, open_list); 286 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 287 mutex_unlock(®ister_mutex); 288 return -EBUSY; 289 } 290 } 291 timeri = snd_timer_instance_new(owner, timer); 292 if (!timeri) { 293 mutex_unlock(®ister_mutex); 294 return -ENOMEM; 295 } 296 /* take a card refcount for safe disconnection */ 297 if (timer->card) 298 get_device(&timer->card->card_dev); 299 timeri->slave_class = tid->dev_sclass; 300 timeri->slave_id = slave_id; 301 302 if (list_empty(&timer->open_list_head) && timer->hw.open) { 303 int err = timer->hw.open(timer); 304 if (err) { 305 kfree(timeri->owner); 306 kfree(timeri); 307 308 if (timer->card) 309 put_device(&timer->card->card_dev); 310 module_put(timer->module); 311 mutex_unlock(®ister_mutex); 312 return err; 313 } 314 } 315 316 list_add_tail(&timeri->open_list, &timer->open_list_head); 317 snd_timer_check_master(timeri); 318 mutex_unlock(®ister_mutex); 319 *ti = timeri; 320 return 0; 321 } 322 323 /* 324 * close a timer instance 325 */ 326 int snd_timer_close(struct snd_timer_instance *timeri) 327 { 328 struct snd_timer *timer = NULL; 329 struct snd_timer_instance *slave, *tmp; 330 331 if (snd_BUG_ON(!timeri)) 332 return -ENXIO; 333 334 mutex_lock(®ister_mutex); 335 list_del(&timeri->open_list); 336 337 /* force to stop the timer */ 338 snd_timer_stop(timeri); 339 340 timer = timeri->timer; 341 if (timer) { 342 /* wait, until the active callback is finished */ 343 spin_lock_irq(&timer->lock); 344 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 345 spin_unlock_irq(&timer->lock); 346 udelay(10); 347 spin_lock_irq(&timer->lock); 348 } 349 spin_unlock_irq(&timer->lock); 350 351 /* remove slave links */ 352 spin_lock_irq(&slave_active_lock); 353 spin_lock(&timer->lock); 354 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 355 open_list) { 356 list_move_tail(&slave->open_list, &snd_timer_slave_list); 357 slave->master = NULL; 358 slave->timer = NULL; 359 list_del_init(&slave->ack_list); 360 list_del_init(&slave->active_list); 361 } 362 spin_unlock(&timer->lock); 363 spin_unlock_irq(&slave_active_lock); 364 365 /* slave doesn't need to release timer resources below */ 366 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 367 timer = NULL; 368 } 369 370 if (timeri->private_free) 371 timeri->private_free(timeri); 372 kfree(timeri->owner); 373 kfree(timeri); 374 375 if (timer) { 376 if (list_empty(&timer->open_list_head) && timer->hw.close) 377 timer->hw.close(timer); 378 /* release a card refcount for safe disconnection */ 379 if (timer->card) 380 put_device(&timer->card->card_dev); 381 module_put(timer->module); 382 } 383 384 mutex_unlock(®ister_mutex); 385 return 0; 386 } 387 388 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 389 { 390 struct snd_timer * timer; 391 392 if (timeri == NULL) 393 return 0; 394 if ((timer = timeri->timer) != NULL) { 395 if (timer->hw.c_resolution) 396 return timer->hw.c_resolution(timer); 397 return timer->hw.resolution; 398 } 399 return 0; 400 } 401 402 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 403 { 404 struct snd_timer *timer; 405 unsigned long resolution = 0; 406 struct snd_timer_instance *ts; 407 struct timespec tstamp; 408 409 if (timer_tstamp_monotonic) 410 ktime_get_ts(&tstamp); 411 else 412 getnstimeofday(&tstamp); 413 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 414 event > SNDRV_TIMER_EVENT_PAUSE)) 415 return; 416 if (event == SNDRV_TIMER_EVENT_START || 417 event == SNDRV_TIMER_EVENT_CONTINUE) 418 resolution = snd_timer_resolution(ti); 419 if (ti->ccallback) 420 ti->ccallback(ti, event, &tstamp, resolution); 421 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 422 return; 423 timer = ti->timer; 424 if (timer == NULL) 425 return; 426 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 427 return; 428 list_for_each_entry(ts, &ti->slave_active_head, active_list) 429 if (ts->ccallback) 430 ts->ccallback(ts, event + 100, &tstamp, resolution); 431 } 432 433 /* start/continue a master timer */ 434 static int snd_timer_start1(struct snd_timer_instance *timeri, 435 bool start, unsigned long ticks) 436 { 437 struct snd_timer *timer; 438 int result; 439 unsigned long flags; 440 441 timer = timeri->timer; 442 if (!timer) 443 return -EINVAL; 444 445 spin_lock_irqsave(&timer->lock, flags); 446 if (timer->card && timer->card->shutdown) { 447 result = -ENODEV; 448 goto unlock; 449 } 450 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 451 SNDRV_TIMER_IFLG_START)) { 452 result = -EBUSY; 453 goto unlock; 454 } 455 456 if (start) 457 timeri->ticks = timeri->cticks = ticks; 458 else if (!timeri->cticks) 459 timeri->cticks = 1; 460 timeri->pticks = 0; 461 462 list_move_tail(&timeri->active_list, &timer->active_list_head); 463 if (timer->running) { 464 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 465 goto __start_now; 466 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 467 timeri->flags |= SNDRV_TIMER_IFLG_START; 468 result = 1; /* delayed start */ 469 } else { 470 if (start) 471 timer->sticks = ticks; 472 timer->hw.start(timer); 473 __start_now: 474 timer->running++; 475 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 476 result = 0; 477 } 478 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 479 SNDRV_TIMER_EVENT_CONTINUE); 480 unlock: 481 spin_unlock_irqrestore(&timer->lock, flags); 482 return result; 483 } 484 485 /* start/continue a slave timer */ 486 static int snd_timer_start_slave(struct snd_timer_instance *timeri, 487 bool start) 488 { 489 unsigned long flags; 490 491 spin_lock_irqsave(&slave_active_lock, flags); 492 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 493 spin_unlock_irqrestore(&slave_active_lock, flags); 494 return -EBUSY; 495 } 496 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 497 if (timeri->master && timeri->timer) { 498 spin_lock(&timeri->timer->lock); 499 list_add_tail(&timeri->active_list, 500 &timeri->master->slave_active_head); 501 snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START : 502 SNDRV_TIMER_EVENT_CONTINUE); 503 spin_unlock(&timeri->timer->lock); 504 } 505 spin_unlock_irqrestore(&slave_active_lock, flags); 506 return 1; /* delayed start */ 507 } 508 509 /* stop/pause a master timer */ 510 static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop) 511 { 512 struct snd_timer *timer; 513 int result = 0; 514 unsigned long flags; 515 516 timer = timeri->timer; 517 if (!timer) 518 return -EINVAL; 519 spin_lock_irqsave(&timer->lock, flags); 520 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 521 SNDRV_TIMER_IFLG_START))) { 522 result = -EBUSY; 523 goto unlock; 524 } 525 list_del_init(&timeri->ack_list); 526 list_del_init(&timeri->active_list); 527 if (timer->card && timer->card->shutdown) 528 goto unlock; 529 if (stop) { 530 timeri->cticks = timeri->ticks; 531 timeri->pticks = 0; 532 } 533 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 534 !(--timer->running)) { 535 timer->hw.stop(timer); 536 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 537 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 538 snd_timer_reschedule(timer, 0); 539 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 540 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 541 timer->hw.start(timer); 542 } 543 } 544 } 545 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 546 if (stop) 547 timeri->flags &= ~SNDRV_TIMER_IFLG_PAUSED; 548 else 549 timeri->flags |= SNDRV_TIMER_IFLG_PAUSED; 550 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 551 SNDRV_TIMER_EVENT_CONTINUE); 552 unlock: 553 spin_unlock_irqrestore(&timer->lock, flags); 554 return result; 555 } 556 557 /* stop/pause a slave timer */ 558 static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop) 559 { 560 unsigned long flags; 561 562 spin_lock_irqsave(&slave_active_lock, flags); 563 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) { 564 spin_unlock_irqrestore(&slave_active_lock, flags); 565 return -EBUSY; 566 } 567 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 568 if (timeri->timer) { 569 spin_lock(&timeri->timer->lock); 570 list_del_init(&timeri->ack_list); 571 list_del_init(&timeri->active_list); 572 snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP : 573 SNDRV_TIMER_EVENT_CONTINUE); 574 spin_unlock(&timeri->timer->lock); 575 } 576 spin_unlock_irqrestore(&slave_active_lock, flags); 577 return 0; 578 } 579 580 /* 581 * start the timer instance 582 */ 583 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 584 { 585 if (timeri == NULL || ticks < 1) 586 return -EINVAL; 587 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 588 return snd_timer_start_slave(timeri, true); 589 else 590 return snd_timer_start1(timeri, true, ticks); 591 } 592 593 /* 594 * stop the timer instance. 595 * 596 * do not call this from the timer callback! 597 */ 598 int snd_timer_stop(struct snd_timer_instance *timeri) 599 { 600 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 601 return snd_timer_stop_slave(timeri, true); 602 else 603 return snd_timer_stop1(timeri, true); 604 } 605 606 /* 607 * start again.. the tick is kept. 608 */ 609 int snd_timer_continue(struct snd_timer_instance *timeri) 610 { 611 /* timer can continue only after pause */ 612 if (!(timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) 613 return -EINVAL; 614 615 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 616 return snd_timer_start_slave(timeri, false); 617 else 618 return snd_timer_start1(timeri, false, 0); 619 } 620 621 /* 622 * pause.. remember the ticks left 623 */ 624 int snd_timer_pause(struct snd_timer_instance * timeri) 625 { 626 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 627 return snd_timer_stop_slave(timeri, false); 628 else 629 return snd_timer_stop1(timeri, false); 630 } 631 632 /* 633 * reschedule the timer 634 * 635 * start pending instances and check the scheduling ticks. 636 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 637 */ 638 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 639 { 640 struct snd_timer_instance *ti; 641 unsigned long ticks = ~0UL; 642 643 list_for_each_entry(ti, &timer->active_list_head, active_list) { 644 if (ti->flags & SNDRV_TIMER_IFLG_START) { 645 ti->flags &= ~SNDRV_TIMER_IFLG_START; 646 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 647 timer->running++; 648 } 649 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 650 if (ticks > ti->cticks) 651 ticks = ti->cticks; 652 } 653 } 654 if (ticks == ~0UL) { 655 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 656 return; 657 } 658 if (ticks > timer->hw.ticks) 659 ticks = timer->hw.ticks; 660 if (ticks_left != ticks) 661 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 662 timer->sticks = ticks; 663 } 664 665 /* 666 * timer tasklet 667 * 668 */ 669 static void snd_timer_tasklet(unsigned long arg) 670 { 671 struct snd_timer *timer = (struct snd_timer *) arg; 672 struct snd_timer_instance *ti; 673 struct list_head *p; 674 unsigned long resolution, ticks; 675 unsigned long flags; 676 677 if (timer->card && timer->card->shutdown) 678 return; 679 680 spin_lock_irqsave(&timer->lock, flags); 681 /* now process all callbacks */ 682 while (!list_empty(&timer->sack_list_head)) { 683 p = timer->sack_list_head.next; /* get first item */ 684 ti = list_entry(p, struct snd_timer_instance, ack_list); 685 686 /* remove from ack_list and make empty */ 687 list_del_init(p); 688 689 ticks = ti->pticks; 690 ti->pticks = 0; 691 resolution = ti->resolution; 692 693 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 694 spin_unlock(&timer->lock); 695 if (ti->callback) 696 ti->callback(ti, resolution, ticks); 697 spin_lock(&timer->lock); 698 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 699 } 700 spin_unlock_irqrestore(&timer->lock, flags); 701 } 702 703 /* 704 * timer interrupt 705 * 706 * ticks_left is usually equal to timer->sticks. 707 * 708 */ 709 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 710 { 711 struct snd_timer_instance *ti, *ts, *tmp; 712 unsigned long resolution, ticks; 713 struct list_head *p, *ack_list_head; 714 unsigned long flags; 715 int use_tasklet = 0; 716 717 if (timer == NULL) 718 return; 719 720 if (timer->card && timer->card->shutdown) 721 return; 722 723 spin_lock_irqsave(&timer->lock, flags); 724 725 /* remember the current resolution */ 726 if (timer->hw.c_resolution) 727 resolution = timer->hw.c_resolution(timer); 728 else 729 resolution = timer->hw.resolution; 730 731 /* loop for all active instances 732 * Here we cannot use list_for_each_entry because the active_list of a 733 * processed instance is relinked to done_list_head before the callback 734 * is called. 735 */ 736 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 737 active_list) { 738 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 739 continue; 740 ti->pticks += ticks_left; 741 ti->resolution = resolution; 742 if (ti->cticks < ticks_left) 743 ti->cticks = 0; 744 else 745 ti->cticks -= ticks_left; 746 if (ti->cticks) /* not expired */ 747 continue; 748 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 749 ti->cticks = ti->ticks; 750 } else { 751 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 752 --timer->running; 753 list_del_init(&ti->active_list); 754 } 755 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 756 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 757 ack_list_head = &timer->ack_list_head; 758 else 759 ack_list_head = &timer->sack_list_head; 760 if (list_empty(&ti->ack_list)) 761 list_add_tail(&ti->ack_list, ack_list_head); 762 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 763 ts->pticks = ti->pticks; 764 ts->resolution = resolution; 765 if (list_empty(&ts->ack_list)) 766 list_add_tail(&ts->ack_list, ack_list_head); 767 } 768 } 769 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 770 snd_timer_reschedule(timer, timer->sticks); 771 if (timer->running) { 772 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 773 timer->hw.stop(timer); 774 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 775 } 776 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 777 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 778 /* restart timer */ 779 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 780 timer->hw.start(timer); 781 } 782 } else { 783 timer->hw.stop(timer); 784 } 785 786 /* now process all fast callbacks */ 787 while (!list_empty(&timer->ack_list_head)) { 788 p = timer->ack_list_head.next; /* get first item */ 789 ti = list_entry(p, struct snd_timer_instance, ack_list); 790 791 /* remove from ack_list and make empty */ 792 list_del_init(p); 793 794 ticks = ti->pticks; 795 ti->pticks = 0; 796 797 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 798 spin_unlock(&timer->lock); 799 if (ti->callback) 800 ti->callback(ti, resolution, ticks); 801 spin_lock(&timer->lock); 802 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 803 } 804 805 /* do we have any slow callbacks? */ 806 use_tasklet = !list_empty(&timer->sack_list_head); 807 spin_unlock_irqrestore(&timer->lock, flags); 808 809 if (use_tasklet) 810 tasklet_schedule(&timer->task_queue); 811 } 812 813 /* 814 815 */ 816 817 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 818 struct snd_timer **rtimer) 819 { 820 struct snd_timer *timer; 821 int err; 822 static struct snd_device_ops ops = { 823 .dev_free = snd_timer_dev_free, 824 .dev_register = snd_timer_dev_register, 825 .dev_disconnect = snd_timer_dev_disconnect, 826 }; 827 828 if (snd_BUG_ON(!tid)) 829 return -EINVAL; 830 if (rtimer) 831 *rtimer = NULL; 832 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 833 if (!timer) 834 return -ENOMEM; 835 timer->tmr_class = tid->dev_class; 836 timer->card = card; 837 timer->tmr_device = tid->device; 838 timer->tmr_subdevice = tid->subdevice; 839 if (id) 840 strlcpy(timer->id, id, sizeof(timer->id)); 841 timer->sticks = 1; 842 INIT_LIST_HEAD(&timer->device_list); 843 INIT_LIST_HEAD(&timer->open_list_head); 844 INIT_LIST_HEAD(&timer->active_list_head); 845 INIT_LIST_HEAD(&timer->ack_list_head); 846 INIT_LIST_HEAD(&timer->sack_list_head); 847 spin_lock_init(&timer->lock); 848 tasklet_init(&timer->task_queue, snd_timer_tasklet, 849 (unsigned long)timer); 850 if (card != NULL) { 851 timer->module = card->module; 852 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 853 if (err < 0) { 854 snd_timer_free(timer); 855 return err; 856 } 857 } 858 if (rtimer) 859 *rtimer = timer; 860 return 0; 861 } 862 863 static int snd_timer_free(struct snd_timer *timer) 864 { 865 if (!timer) 866 return 0; 867 868 mutex_lock(®ister_mutex); 869 if (! list_empty(&timer->open_list_head)) { 870 struct list_head *p, *n; 871 struct snd_timer_instance *ti; 872 pr_warn("ALSA: timer %p is busy?\n", timer); 873 list_for_each_safe(p, n, &timer->open_list_head) { 874 list_del_init(p); 875 ti = list_entry(p, struct snd_timer_instance, open_list); 876 ti->timer = NULL; 877 } 878 } 879 list_del(&timer->device_list); 880 mutex_unlock(®ister_mutex); 881 882 if (timer->private_free) 883 timer->private_free(timer); 884 kfree(timer); 885 return 0; 886 } 887 888 static int snd_timer_dev_free(struct snd_device *device) 889 { 890 struct snd_timer *timer = device->device_data; 891 return snd_timer_free(timer); 892 } 893 894 static int snd_timer_dev_register(struct snd_device *dev) 895 { 896 struct snd_timer *timer = dev->device_data; 897 struct snd_timer *timer1; 898 899 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 900 return -ENXIO; 901 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 902 !timer->hw.resolution && timer->hw.c_resolution == NULL) 903 return -EINVAL; 904 905 mutex_lock(®ister_mutex); 906 list_for_each_entry(timer1, &snd_timer_list, device_list) { 907 if (timer1->tmr_class > timer->tmr_class) 908 break; 909 if (timer1->tmr_class < timer->tmr_class) 910 continue; 911 if (timer1->card && timer->card) { 912 if (timer1->card->number > timer->card->number) 913 break; 914 if (timer1->card->number < timer->card->number) 915 continue; 916 } 917 if (timer1->tmr_device > timer->tmr_device) 918 break; 919 if (timer1->tmr_device < timer->tmr_device) 920 continue; 921 if (timer1->tmr_subdevice > timer->tmr_subdevice) 922 break; 923 if (timer1->tmr_subdevice < timer->tmr_subdevice) 924 continue; 925 /* conflicts.. */ 926 mutex_unlock(®ister_mutex); 927 return -EBUSY; 928 } 929 list_add_tail(&timer->device_list, &timer1->device_list); 930 mutex_unlock(®ister_mutex); 931 return 0; 932 } 933 934 static int snd_timer_dev_disconnect(struct snd_device *device) 935 { 936 struct snd_timer *timer = device->device_data; 937 struct snd_timer_instance *ti; 938 939 mutex_lock(®ister_mutex); 940 list_del_init(&timer->device_list); 941 /* wake up pending sleepers */ 942 list_for_each_entry(ti, &timer->open_list_head, open_list) { 943 if (ti->disconnect) 944 ti->disconnect(ti); 945 } 946 mutex_unlock(®ister_mutex); 947 return 0; 948 } 949 950 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 951 { 952 unsigned long flags; 953 unsigned long resolution = 0; 954 struct snd_timer_instance *ti, *ts; 955 956 if (timer->card && timer->card->shutdown) 957 return; 958 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 959 return; 960 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 961 event > SNDRV_TIMER_EVENT_MRESUME)) 962 return; 963 spin_lock_irqsave(&timer->lock, flags); 964 if (event == SNDRV_TIMER_EVENT_MSTART || 965 event == SNDRV_TIMER_EVENT_MCONTINUE || 966 event == SNDRV_TIMER_EVENT_MRESUME) { 967 if (timer->hw.c_resolution) 968 resolution = timer->hw.c_resolution(timer); 969 else 970 resolution = timer->hw.resolution; 971 } 972 list_for_each_entry(ti, &timer->active_list_head, active_list) { 973 if (ti->ccallback) 974 ti->ccallback(ti, event, tstamp, resolution); 975 list_for_each_entry(ts, &ti->slave_active_head, active_list) 976 if (ts->ccallback) 977 ts->ccallback(ts, event, tstamp, resolution); 978 } 979 spin_unlock_irqrestore(&timer->lock, flags); 980 } 981 982 /* 983 * exported functions for global timers 984 */ 985 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 986 { 987 struct snd_timer_id tid; 988 989 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 990 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 991 tid.card = -1; 992 tid.device = device; 993 tid.subdevice = 0; 994 return snd_timer_new(NULL, id, &tid, rtimer); 995 } 996 997 int snd_timer_global_free(struct snd_timer *timer) 998 { 999 return snd_timer_free(timer); 1000 } 1001 1002 int snd_timer_global_register(struct snd_timer *timer) 1003 { 1004 struct snd_device dev; 1005 1006 memset(&dev, 0, sizeof(dev)); 1007 dev.device_data = timer; 1008 return snd_timer_dev_register(&dev); 1009 } 1010 1011 /* 1012 * System timer 1013 */ 1014 1015 struct snd_timer_system_private { 1016 struct timer_list tlist; 1017 unsigned long last_expires; 1018 unsigned long last_jiffies; 1019 unsigned long correction; 1020 }; 1021 1022 static void snd_timer_s_function(unsigned long data) 1023 { 1024 struct snd_timer *timer = (struct snd_timer *)data; 1025 struct snd_timer_system_private *priv = timer->private_data; 1026 unsigned long jiff = jiffies; 1027 if (time_after(jiff, priv->last_expires)) 1028 priv->correction += (long)jiff - (long)priv->last_expires; 1029 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1030 } 1031 1032 static int snd_timer_s_start(struct snd_timer * timer) 1033 { 1034 struct snd_timer_system_private *priv; 1035 unsigned long njiff; 1036 1037 priv = (struct snd_timer_system_private *) timer->private_data; 1038 njiff = (priv->last_jiffies = jiffies); 1039 if (priv->correction > timer->sticks - 1) { 1040 priv->correction -= timer->sticks - 1; 1041 njiff++; 1042 } else { 1043 njiff += timer->sticks - priv->correction; 1044 priv->correction = 0; 1045 } 1046 priv->last_expires = njiff; 1047 mod_timer(&priv->tlist, njiff); 1048 return 0; 1049 } 1050 1051 static int snd_timer_s_stop(struct snd_timer * timer) 1052 { 1053 struct snd_timer_system_private *priv; 1054 unsigned long jiff; 1055 1056 priv = (struct snd_timer_system_private *) timer->private_data; 1057 del_timer(&priv->tlist); 1058 jiff = jiffies; 1059 if (time_before(jiff, priv->last_expires)) 1060 timer->sticks = priv->last_expires - jiff; 1061 else 1062 timer->sticks = 1; 1063 priv->correction = 0; 1064 return 0; 1065 } 1066 1067 static int snd_timer_s_close(struct snd_timer *timer) 1068 { 1069 struct snd_timer_system_private *priv; 1070 1071 priv = (struct snd_timer_system_private *)timer->private_data; 1072 del_timer_sync(&priv->tlist); 1073 return 0; 1074 } 1075 1076 static struct snd_timer_hardware snd_timer_system = 1077 { 1078 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1079 .resolution = 1000000000L / HZ, 1080 .ticks = 10000000L, 1081 .close = snd_timer_s_close, 1082 .start = snd_timer_s_start, 1083 .stop = snd_timer_s_stop 1084 }; 1085 1086 static void snd_timer_free_system(struct snd_timer *timer) 1087 { 1088 kfree(timer->private_data); 1089 } 1090 1091 static int snd_timer_register_system(void) 1092 { 1093 struct snd_timer *timer; 1094 struct snd_timer_system_private *priv; 1095 int err; 1096 1097 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1098 if (err < 0) 1099 return err; 1100 strcpy(timer->name, "system timer"); 1101 timer->hw = snd_timer_system; 1102 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1103 if (priv == NULL) { 1104 snd_timer_free(timer); 1105 return -ENOMEM; 1106 } 1107 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1108 timer->private_data = priv; 1109 timer->private_free = snd_timer_free_system; 1110 return snd_timer_global_register(timer); 1111 } 1112 1113 #ifdef CONFIG_SND_PROC_FS 1114 /* 1115 * Info interface 1116 */ 1117 1118 static void snd_timer_proc_read(struct snd_info_entry *entry, 1119 struct snd_info_buffer *buffer) 1120 { 1121 struct snd_timer *timer; 1122 struct snd_timer_instance *ti; 1123 1124 mutex_lock(®ister_mutex); 1125 list_for_each_entry(timer, &snd_timer_list, device_list) { 1126 if (timer->card && timer->card->shutdown) 1127 continue; 1128 switch (timer->tmr_class) { 1129 case SNDRV_TIMER_CLASS_GLOBAL: 1130 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1131 break; 1132 case SNDRV_TIMER_CLASS_CARD: 1133 snd_iprintf(buffer, "C%i-%i: ", 1134 timer->card->number, timer->tmr_device); 1135 break; 1136 case SNDRV_TIMER_CLASS_PCM: 1137 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1138 timer->tmr_device, timer->tmr_subdevice); 1139 break; 1140 default: 1141 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1142 timer->card ? timer->card->number : -1, 1143 timer->tmr_device, timer->tmr_subdevice); 1144 } 1145 snd_iprintf(buffer, "%s :", timer->name); 1146 if (timer->hw.resolution) 1147 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1148 timer->hw.resolution / 1000, 1149 timer->hw.resolution % 1000, 1150 timer->hw.ticks); 1151 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1152 snd_iprintf(buffer, " SLAVE"); 1153 snd_iprintf(buffer, "\n"); 1154 list_for_each_entry(ti, &timer->open_list_head, open_list) 1155 snd_iprintf(buffer, " Client %s : %s\n", 1156 ti->owner ? ti->owner : "unknown", 1157 ti->flags & (SNDRV_TIMER_IFLG_START | 1158 SNDRV_TIMER_IFLG_RUNNING) 1159 ? "running" : "stopped"); 1160 } 1161 mutex_unlock(®ister_mutex); 1162 } 1163 1164 static struct snd_info_entry *snd_timer_proc_entry; 1165 1166 static void __init snd_timer_proc_init(void) 1167 { 1168 struct snd_info_entry *entry; 1169 1170 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1171 if (entry != NULL) { 1172 entry->c.text.read = snd_timer_proc_read; 1173 if (snd_info_register(entry) < 0) { 1174 snd_info_free_entry(entry); 1175 entry = NULL; 1176 } 1177 } 1178 snd_timer_proc_entry = entry; 1179 } 1180 1181 static void __exit snd_timer_proc_done(void) 1182 { 1183 snd_info_free_entry(snd_timer_proc_entry); 1184 } 1185 #else /* !CONFIG_SND_PROC_FS */ 1186 #define snd_timer_proc_init() 1187 #define snd_timer_proc_done() 1188 #endif 1189 1190 /* 1191 * USER SPACE interface 1192 */ 1193 1194 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1195 unsigned long resolution, 1196 unsigned long ticks) 1197 { 1198 struct snd_timer_user *tu = timeri->callback_data; 1199 struct snd_timer_read *r; 1200 int prev; 1201 1202 spin_lock(&tu->qlock); 1203 if (tu->qused > 0) { 1204 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1205 r = &tu->queue[prev]; 1206 if (r->resolution == resolution) { 1207 r->ticks += ticks; 1208 goto __wake; 1209 } 1210 } 1211 if (tu->qused >= tu->queue_size) { 1212 tu->overrun++; 1213 } else { 1214 r = &tu->queue[tu->qtail++]; 1215 tu->qtail %= tu->queue_size; 1216 r->resolution = resolution; 1217 r->ticks = ticks; 1218 tu->qused++; 1219 } 1220 __wake: 1221 spin_unlock(&tu->qlock); 1222 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1223 wake_up(&tu->qchange_sleep); 1224 } 1225 1226 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1227 struct snd_timer_tread *tread) 1228 { 1229 if (tu->qused >= tu->queue_size) { 1230 tu->overrun++; 1231 } else { 1232 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1233 tu->qtail %= tu->queue_size; 1234 tu->qused++; 1235 } 1236 } 1237 1238 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1239 int event, 1240 struct timespec *tstamp, 1241 unsigned long resolution) 1242 { 1243 struct snd_timer_user *tu = timeri->callback_data; 1244 struct snd_timer_tread r1; 1245 unsigned long flags; 1246 1247 if (event >= SNDRV_TIMER_EVENT_START && 1248 event <= SNDRV_TIMER_EVENT_PAUSE) 1249 tu->tstamp = *tstamp; 1250 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1251 return; 1252 memset(&r1, 0, sizeof(r1)); 1253 r1.event = event; 1254 r1.tstamp = *tstamp; 1255 r1.val = resolution; 1256 spin_lock_irqsave(&tu->qlock, flags); 1257 snd_timer_user_append_to_tqueue(tu, &r1); 1258 spin_unlock_irqrestore(&tu->qlock, flags); 1259 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1260 wake_up(&tu->qchange_sleep); 1261 } 1262 1263 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1264 { 1265 struct snd_timer_user *tu = timeri->callback_data; 1266 1267 tu->disconnected = true; 1268 wake_up(&tu->qchange_sleep); 1269 } 1270 1271 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1272 unsigned long resolution, 1273 unsigned long ticks) 1274 { 1275 struct snd_timer_user *tu = timeri->callback_data; 1276 struct snd_timer_tread *r, r1; 1277 struct timespec tstamp; 1278 int prev, append = 0; 1279 1280 memset(&r1, 0, sizeof(r1)); 1281 memset(&tstamp, 0, sizeof(tstamp)); 1282 spin_lock(&tu->qlock); 1283 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1284 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1285 spin_unlock(&tu->qlock); 1286 return; 1287 } 1288 if (tu->last_resolution != resolution || ticks > 0) { 1289 if (timer_tstamp_monotonic) 1290 ktime_get_ts(&tstamp); 1291 else 1292 getnstimeofday(&tstamp); 1293 } 1294 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1295 tu->last_resolution != resolution) { 1296 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1297 r1.tstamp = tstamp; 1298 r1.val = resolution; 1299 snd_timer_user_append_to_tqueue(tu, &r1); 1300 tu->last_resolution = resolution; 1301 append++; 1302 } 1303 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1304 goto __wake; 1305 if (ticks == 0) 1306 goto __wake; 1307 if (tu->qused > 0) { 1308 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1309 r = &tu->tqueue[prev]; 1310 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1311 r->tstamp = tstamp; 1312 r->val += ticks; 1313 append++; 1314 goto __wake; 1315 } 1316 } 1317 r1.event = SNDRV_TIMER_EVENT_TICK; 1318 r1.tstamp = tstamp; 1319 r1.val = ticks; 1320 snd_timer_user_append_to_tqueue(tu, &r1); 1321 append++; 1322 __wake: 1323 spin_unlock(&tu->qlock); 1324 if (append == 0) 1325 return; 1326 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1327 wake_up(&tu->qchange_sleep); 1328 } 1329 1330 static int snd_timer_user_open(struct inode *inode, struct file *file) 1331 { 1332 struct snd_timer_user *tu; 1333 int err; 1334 1335 err = nonseekable_open(inode, file); 1336 if (err < 0) 1337 return err; 1338 1339 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1340 if (tu == NULL) 1341 return -ENOMEM; 1342 spin_lock_init(&tu->qlock); 1343 init_waitqueue_head(&tu->qchange_sleep); 1344 mutex_init(&tu->ioctl_lock); 1345 tu->ticks = 1; 1346 tu->queue_size = 128; 1347 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1348 GFP_KERNEL); 1349 if (tu->queue == NULL) { 1350 kfree(tu); 1351 return -ENOMEM; 1352 } 1353 file->private_data = tu; 1354 return 0; 1355 } 1356 1357 static int snd_timer_user_release(struct inode *inode, struct file *file) 1358 { 1359 struct snd_timer_user *tu; 1360 1361 if (file->private_data) { 1362 tu = file->private_data; 1363 file->private_data = NULL; 1364 mutex_lock(&tu->ioctl_lock); 1365 if (tu->timeri) 1366 snd_timer_close(tu->timeri); 1367 mutex_unlock(&tu->ioctl_lock); 1368 kfree(tu->queue); 1369 kfree(tu->tqueue); 1370 kfree(tu); 1371 } 1372 return 0; 1373 } 1374 1375 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1376 { 1377 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1378 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1379 id->card = -1; 1380 id->device = -1; 1381 id->subdevice = -1; 1382 } 1383 1384 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1385 { 1386 id->dev_class = timer->tmr_class; 1387 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1388 id->card = timer->card ? timer->card->number : -1; 1389 id->device = timer->tmr_device; 1390 id->subdevice = timer->tmr_subdevice; 1391 } 1392 1393 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1394 { 1395 struct snd_timer_id id; 1396 struct snd_timer *timer; 1397 struct list_head *p; 1398 1399 if (copy_from_user(&id, _tid, sizeof(id))) 1400 return -EFAULT; 1401 mutex_lock(®ister_mutex); 1402 if (id.dev_class < 0) { /* first item */ 1403 if (list_empty(&snd_timer_list)) 1404 snd_timer_user_zero_id(&id); 1405 else { 1406 timer = list_entry(snd_timer_list.next, 1407 struct snd_timer, device_list); 1408 snd_timer_user_copy_id(&id, timer); 1409 } 1410 } else { 1411 switch (id.dev_class) { 1412 case SNDRV_TIMER_CLASS_GLOBAL: 1413 id.device = id.device < 0 ? 0 : id.device + 1; 1414 list_for_each(p, &snd_timer_list) { 1415 timer = list_entry(p, struct snd_timer, device_list); 1416 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1417 snd_timer_user_copy_id(&id, timer); 1418 break; 1419 } 1420 if (timer->tmr_device >= id.device) { 1421 snd_timer_user_copy_id(&id, timer); 1422 break; 1423 } 1424 } 1425 if (p == &snd_timer_list) 1426 snd_timer_user_zero_id(&id); 1427 break; 1428 case SNDRV_TIMER_CLASS_CARD: 1429 case SNDRV_TIMER_CLASS_PCM: 1430 if (id.card < 0) { 1431 id.card = 0; 1432 } else { 1433 if (id.device < 0) { 1434 id.device = 0; 1435 } else { 1436 if (id.subdevice < 0) 1437 id.subdevice = 0; 1438 else 1439 id.subdevice++; 1440 } 1441 } 1442 list_for_each(p, &snd_timer_list) { 1443 timer = list_entry(p, struct snd_timer, device_list); 1444 if (timer->tmr_class > id.dev_class) { 1445 snd_timer_user_copy_id(&id, timer); 1446 break; 1447 } 1448 if (timer->tmr_class < id.dev_class) 1449 continue; 1450 if (timer->card->number > id.card) { 1451 snd_timer_user_copy_id(&id, timer); 1452 break; 1453 } 1454 if (timer->card->number < id.card) 1455 continue; 1456 if (timer->tmr_device > id.device) { 1457 snd_timer_user_copy_id(&id, timer); 1458 break; 1459 } 1460 if (timer->tmr_device < id.device) 1461 continue; 1462 if (timer->tmr_subdevice > id.subdevice) { 1463 snd_timer_user_copy_id(&id, timer); 1464 break; 1465 } 1466 if (timer->tmr_subdevice < id.subdevice) 1467 continue; 1468 snd_timer_user_copy_id(&id, timer); 1469 break; 1470 } 1471 if (p == &snd_timer_list) 1472 snd_timer_user_zero_id(&id); 1473 break; 1474 default: 1475 snd_timer_user_zero_id(&id); 1476 } 1477 } 1478 mutex_unlock(®ister_mutex); 1479 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1480 return -EFAULT; 1481 return 0; 1482 } 1483 1484 static int snd_timer_user_ginfo(struct file *file, 1485 struct snd_timer_ginfo __user *_ginfo) 1486 { 1487 struct snd_timer_ginfo *ginfo; 1488 struct snd_timer_id tid; 1489 struct snd_timer *t; 1490 struct list_head *p; 1491 int err = 0; 1492 1493 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1494 if (IS_ERR(ginfo)) 1495 return PTR_ERR(ginfo); 1496 1497 tid = ginfo->tid; 1498 memset(ginfo, 0, sizeof(*ginfo)); 1499 ginfo->tid = tid; 1500 mutex_lock(®ister_mutex); 1501 t = snd_timer_find(&tid); 1502 if (t != NULL) { 1503 ginfo->card = t->card ? t->card->number : -1; 1504 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1505 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1506 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1507 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1508 ginfo->resolution = t->hw.resolution; 1509 if (t->hw.resolution_min > 0) { 1510 ginfo->resolution_min = t->hw.resolution_min; 1511 ginfo->resolution_max = t->hw.resolution_max; 1512 } 1513 list_for_each(p, &t->open_list_head) { 1514 ginfo->clients++; 1515 } 1516 } else { 1517 err = -ENODEV; 1518 } 1519 mutex_unlock(®ister_mutex); 1520 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1521 err = -EFAULT; 1522 kfree(ginfo); 1523 return err; 1524 } 1525 1526 static int timer_set_gparams(struct snd_timer_gparams *gparams) 1527 { 1528 struct snd_timer *t; 1529 int err; 1530 1531 mutex_lock(®ister_mutex); 1532 t = snd_timer_find(&gparams->tid); 1533 if (!t) { 1534 err = -ENODEV; 1535 goto _error; 1536 } 1537 if (!list_empty(&t->open_list_head)) { 1538 err = -EBUSY; 1539 goto _error; 1540 } 1541 if (!t->hw.set_period) { 1542 err = -ENOSYS; 1543 goto _error; 1544 } 1545 err = t->hw.set_period(t, gparams->period_num, gparams->period_den); 1546 _error: 1547 mutex_unlock(®ister_mutex); 1548 return err; 1549 } 1550 1551 static int snd_timer_user_gparams(struct file *file, 1552 struct snd_timer_gparams __user *_gparams) 1553 { 1554 struct snd_timer_gparams gparams; 1555 1556 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1557 return -EFAULT; 1558 return timer_set_gparams(&gparams); 1559 } 1560 1561 static int snd_timer_user_gstatus(struct file *file, 1562 struct snd_timer_gstatus __user *_gstatus) 1563 { 1564 struct snd_timer_gstatus gstatus; 1565 struct snd_timer_id tid; 1566 struct snd_timer *t; 1567 int err = 0; 1568 1569 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1570 return -EFAULT; 1571 tid = gstatus.tid; 1572 memset(&gstatus, 0, sizeof(gstatus)); 1573 gstatus.tid = tid; 1574 mutex_lock(®ister_mutex); 1575 t = snd_timer_find(&tid); 1576 if (t != NULL) { 1577 if (t->hw.c_resolution) 1578 gstatus.resolution = t->hw.c_resolution(t); 1579 else 1580 gstatus.resolution = t->hw.resolution; 1581 if (t->hw.precise_resolution) { 1582 t->hw.precise_resolution(t, &gstatus.resolution_num, 1583 &gstatus.resolution_den); 1584 } else { 1585 gstatus.resolution_num = gstatus.resolution; 1586 gstatus.resolution_den = 1000000000uL; 1587 } 1588 } else { 1589 err = -ENODEV; 1590 } 1591 mutex_unlock(®ister_mutex); 1592 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1593 err = -EFAULT; 1594 return err; 1595 } 1596 1597 static int snd_timer_user_tselect(struct file *file, 1598 struct snd_timer_select __user *_tselect) 1599 { 1600 struct snd_timer_user *tu; 1601 struct snd_timer_select tselect; 1602 char str[32]; 1603 int err = 0; 1604 1605 tu = file->private_data; 1606 if (tu->timeri) { 1607 snd_timer_close(tu->timeri); 1608 tu->timeri = NULL; 1609 } 1610 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1611 err = -EFAULT; 1612 goto __err; 1613 } 1614 sprintf(str, "application %i", current->pid); 1615 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1616 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1617 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1618 if (err < 0) 1619 goto __err; 1620 1621 kfree(tu->queue); 1622 tu->queue = NULL; 1623 kfree(tu->tqueue); 1624 tu->tqueue = NULL; 1625 if (tu->tread) { 1626 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1627 GFP_KERNEL); 1628 if (tu->tqueue == NULL) 1629 err = -ENOMEM; 1630 } else { 1631 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1632 GFP_KERNEL); 1633 if (tu->queue == NULL) 1634 err = -ENOMEM; 1635 } 1636 1637 if (err < 0) { 1638 snd_timer_close(tu->timeri); 1639 tu->timeri = NULL; 1640 } else { 1641 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1642 tu->timeri->callback = tu->tread 1643 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1644 tu->timeri->ccallback = snd_timer_user_ccallback; 1645 tu->timeri->callback_data = (void *)tu; 1646 tu->timeri->disconnect = snd_timer_user_disconnect; 1647 } 1648 1649 __err: 1650 return err; 1651 } 1652 1653 static int snd_timer_user_info(struct file *file, 1654 struct snd_timer_info __user *_info) 1655 { 1656 struct snd_timer_user *tu; 1657 struct snd_timer_info *info; 1658 struct snd_timer *t; 1659 int err = 0; 1660 1661 tu = file->private_data; 1662 if (!tu->timeri) 1663 return -EBADFD; 1664 t = tu->timeri->timer; 1665 if (!t) 1666 return -EBADFD; 1667 1668 info = kzalloc(sizeof(*info), GFP_KERNEL); 1669 if (! info) 1670 return -ENOMEM; 1671 info->card = t->card ? t->card->number : -1; 1672 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1673 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1674 strlcpy(info->id, t->id, sizeof(info->id)); 1675 strlcpy(info->name, t->name, sizeof(info->name)); 1676 info->resolution = t->hw.resolution; 1677 if (copy_to_user(_info, info, sizeof(*_info))) 1678 err = -EFAULT; 1679 kfree(info); 1680 return err; 1681 } 1682 1683 static int snd_timer_user_params(struct file *file, 1684 struct snd_timer_params __user *_params) 1685 { 1686 struct snd_timer_user *tu; 1687 struct snd_timer_params params; 1688 struct snd_timer *t; 1689 struct snd_timer_read *tr; 1690 struct snd_timer_tread *ttr; 1691 int err; 1692 1693 tu = file->private_data; 1694 if (!tu->timeri) 1695 return -EBADFD; 1696 t = tu->timeri->timer; 1697 if (!t) 1698 return -EBADFD; 1699 if (copy_from_user(¶ms, _params, sizeof(params))) 1700 return -EFAULT; 1701 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE)) { 1702 u64 resolution; 1703 1704 if (params.ticks < 1) { 1705 err = -EINVAL; 1706 goto _end; 1707 } 1708 1709 /* Don't allow resolution less than 1ms */ 1710 resolution = snd_timer_resolution(tu->timeri); 1711 resolution *= params.ticks; 1712 if (resolution < 1000000) { 1713 err = -EINVAL; 1714 goto _end; 1715 } 1716 } 1717 if (params.queue_size > 0 && 1718 (params.queue_size < 32 || params.queue_size > 1024)) { 1719 err = -EINVAL; 1720 goto _end; 1721 } 1722 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1723 (1<<SNDRV_TIMER_EVENT_TICK)| 1724 (1<<SNDRV_TIMER_EVENT_START)| 1725 (1<<SNDRV_TIMER_EVENT_STOP)| 1726 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1727 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1728 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1729 (1<<SNDRV_TIMER_EVENT_RESUME)| 1730 (1<<SNDRV_TIMER_EVENT_MSTART)| 1731 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1732 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1733 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1734 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1735 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1736 err = -EINVAL; 1737 goto _end; 1738 } 1739 snd_timer_stop(tu->timeri); 1740 spin_lock_irq(&t->lock); 1741 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1742 SNDRV_TIMER_IFLG_EXCLUSIVE| 1743 SNDRV_TIMER_IFLG_EARLY_EVENT); 1744 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1745 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1746 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1747 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1748 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1749 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1750 spin_unlock_irq(&t->lock); 1751 if (params.queue_size > 0 && 1752 (unsigned int)tu->queue_size != params.queue_size) { 1753 if (tu->tread) { 1754 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1755 GFP_KERNEL); 1756 if (ttr) { 1757 kfree(tu->tqueue); 1758 tu->queue_size = params.queue_size; 1759 tu->tqueue = ttr; 1760 } 1761 } else { 1762 tr = kmalloc(params.queue_size * sizeof(*tr), 1763 GFP_KERNEL); 1764 if (tr) { 1765 kfree(tu->queue); 1766 tu->queue_size = params.queue_size; 1767 tu->queue = tr; 1768 } 1769 } 1770 } 1771 tu->qhead = tu->qtail = tu->qused = 0; 1772 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1773 if (tu->tread) { 1774 struct snd_timer_tread tread; 1775 memset(&tread, 0, sizeof(tread)); 1776 tread.event = SNDRV_TIMER_EVENT_EARLY; 1777 tread.tstamp.tv_sec = 0; 1778 tread.tstamp.tv_nsec = 0; 1779 tread.val = 0; 1780 snd_timer_user_append_to_tqueue(tu, &tread); 1781 } else { 1782 struct snd_timer_read *r = &tu->queue[0]; 1783 r->resolution = 0; 1784 r->ticks = 0; 1785 tu->qused++; 1786 tu->qtail++; 1787 } 1788 } 1789 tu->filter = params.filter; 1790 tu->ticks = params.ticks; 1791 err = 0; 1792 _end: 1793 if (copy_to_user(_params, ¶ms, sizeof(params))) 1794 return -EFAULT; 1795 return err; 1796 } 1797 1798 static int snd_timer_user_status(struct file *file, 1799 struct snd_timer_status __user *_status) 1800 { 1801 struct snd_timer_user *tu; 1802 struct snd_timer_status status; 1803 1804 tu = file->private_data; 1805 if (!tu->timeri) 1806 return -EBADFD; 1807 memset(&status, 0, sizeof(status)); 1808 status.tstamp = tu->tstamp; 1809 status.resolution = snd_timer_resolution(tu->timeri); 1810 status.lost = tu->timeri->lost; 1811 status.overrun = tu->overrun; 1812 spin_lock_irq(&tu->qlock); 1813 status.queue = tu->qused; 1814 spin_unlock_irq(&tu->qlock); 1815 if (copy_to_user(_status, &status, sizeof(status))) 1816 return -EFAULT; 1817 return 0; 1818 } 1819 1820 static int snd_timer_user_start(struct file *file) 1821 { 1822 int err; 1823 struct snd_timer_user *tu; 1824 1825 tu = file->private_data; 1826 if (!tu->timeri) 1827 return -EBADFD; 1828 snd_timer_stop(tu->timeri); 1829 tu->timeri->lost = 0; 1830 tu->last_resolution = 0; 1831 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1832 } 1833 1834 static int snd_timer_user_stop(struct file *file) 1835 { 1836 int err; 1837 struct snd_timer_user *tu; 1838 1839 tu = file->private_data; 1840 if (!tu->timeri) 1841 return -EBADFD; 1842 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1843 } 1844 1845 static int snd_timer_user_continue(struct file *file) 1846 { 1847 int err; 1848 struct snd_timer_user *tu; 1849 1850 tu = file->private_data; 1851 if (!tu->timeri) 1852 return -EBADFD; 1853 /* start timer instead of continue if it's not used before */ 1854 if (!(tu->timeri->flags & SNDRV_TIMER_IFLG_PAUSED)) 1855 return snd_timer_user_start(file); 1856 tu->timeri->lost = 0; 1857 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1858 } 1859 1860 static int snd_timer_user_pause(struct file *file) 1861 { 1862 int err; 1863 struct snd_timer_user *tu; 1864 1865 tu = file->private_data; 1866 if (!tu->timeri) 1867 return -EBADFD; 1868 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1869 } 1870 1871 enum { 1872 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1873 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1874 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1875 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1876 }; 1877 1878 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1879 unsigned long arg) 1880 { 1881 struct snd_timer_user *tu; 1882 void __user *argp = (void __user *)arg; 1883 int __user *p = argp; 1884 1885 tu = file->private_data; 1886 switch (cmd) { 1887 case SNDRV_TIMER_IOCTL_PVERSION: 1888 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1889 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1890 return snd_timer_user_next_device(argp); 1891 case SNDRV_TIMER_IOCTL_TREAD: 1892 { 1893 int xarg; 1894 1895 if (tu->timeri) /* too late */ 1896 return -EBUSY; 1897 if (get_user(xarg, p)) 1898 return -EFAULT; 1899 tu->tread = xarg ? 1 : 0; 1900 return 0; 1901 } 1902 case SNDRV_TIMER_IOCTL_GINFO: 1903 return snd_timer_user_ginfo(file, argp); 1904 case SNDRV_TIMER_IOCTL_GPARAMS: 1905 return snd_timer_user_gparams(file, argp); 1906 case SNDRV_TIMER_IOCTL_GSTATUS: 1907 return snd_timer_user_gstatus(file, argp); 1908 case SNDRV_TIMER_IOCTL_SELECT: 1909 return snd_timer_user_tselect(file, argp); 1910 case SNDRV_TIMER_IOCTL_INFO: 1911 return snd_timer_user_info(file, argp); 1912 case SNDRV_TIMER_IOCTL_PARAMS: 1913 return snd_timer_user_params(file, argp); 1914 case SNDRV_TIMER_IOCTL_STATUS: 1915 return snd_timer_user_status(file, argp); 1916 case SNDRV_TIMER_IOCTL_START: 1917 case SNDRV_TIMER_IOCTL_START_OLD: 1918 return snd_timer_user_start(file); 1919 case SNDRV_TIMER_IOCTL_STOP: 1920 case SNDRV_TIMER_IOCTL_STOP_OLD: 1921 return snd_timer_user_stop(file); 1922 case SNDRV_TIMER_IOCTL_CONTINUE: 1923 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1924 return snd_timer_user_continue(file); 1925 case SNDRV_TIMER_IOCTL_PAUSE: 1926 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1927 return snd_timer_user_pause(file); 1928 } 1929 return -ENOTTY; 1930 } 1931 1932 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1933 unsigned long arg) 1934 { 1935 struct snd_timer_user *tu = file->private_data; 1936 long ret; 1937 1938 mutex_lock(&tu->ioctl_lock); 1939 ret = __snd_timer_user_ioctl(file, cmd, arg); 1940 mutex_unlock(&tu->ioctl_lock); 1941 return ret; 1942 } 1943 1944 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1945 { 1946 struct snd_timer_user *tu; 1947 1948 tu = file->private_data; 1949 return fasync_helper(fd, file, on, &tu->fasync); 1950 } 1951 1952 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1953 size_t count, loff_t *offset) 1954 { 1955 struct snd_timer_user *tu; 1956 long result = 0, unit; 1957 int qhead; 1958 int err = 0; 1959 1960 tu = file->private_data; 1961 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1962 spin_lock_irq(&tu->qlock); 1963 while ((long)count - result >= unit) { 1964 while (!tu->qused) { 1965 wait_queue_t wait; 1966 1967 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1968 err = -EAGAIN; 1969 goto _error; 1970 } 1971 1972 set_current_state(TASK_INTERRUPTIBLE); 1973 init_waitqueue_entry(&wait, current); 1974 add_wait_queue(&tu->qchange_sleep, &wait); 1975 1976 spin_unlock_irq(&tu->qlock); 1977 schedule(); 1978 spin_lock_irq(&tu->qlock); 1979 1980 remove_wait_queue(&tu->qchange_sleep, &wait); 1981 1982 if (tu->disconnected) { 1983 err = -ENODEV; 1984 goto _error; 1985 } 1986 if (signal_pending(current)) { 1987 err = -ERESTARTSYS; 1988 goto _error; 1989 } 1990 } 1991 1992 qhead = tu->qhead++; 1993 tu->qhead %= tu->queue_size; 1994 tu->qused--; 1995 spin_unlock_irq(&tu->qlock); 1996 1997 mutex_lock(&tu->ioctl_lock); 1998 if (tu->tread) { 1999 if (copy_to_user(buffer, &tu->tqueue[qhead], 2000 sizeof(struct snd_timer_tread))) 2001 err = -EFAULT; 2002 } else { 2003 if (copy_to_user(buffer, &tu->queue[qhead], 2004 sizeof(struct snd_timer_read))) 2005 err = -EFAULT; 2006 } 2007 mutex_unlock(&tu->ioctl_lock); 2008 2009 spin_lock_irq(&tu->qlock); 2010 if (err < 0) 2011 goto _error; 2012 result += unit; 2013 buffer += unit; 2014 } 2015 _error: 2016 spin_unlock_irq(&tu->qlock); 2017 return result > 0 ? result : err; 2018 } 2019 2020 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 2021 { 2022 unsigned int mask; 2023 struct snd_timer_user *tu; 2024 2025 tu = file->private_data; 2026 2027 poll_wait(file, &tu->qchange_sleep, wait); 2028 2029 mask = 0; 2030 if (tu->qused) 2031 mask |= POLLIN | POLLRDNORM; 2032 if (tu->disconnected) 2033 mask |= POLLERR; 2034 2035 return mask; 2036 } 2037 2038 #ifdef CONFIG_COMPAT 2039 #include "timer_compat.c" 2040 #else 2041 #define snd_timer_user_ioctl_compat NULL 2042 #endif 2043 2044 static const struct file_operations snd_timer_f_ops = 2045 { 2046 .owner = THIS_MODULE, 2047 .read = snd_timer_user_read, 2048 .open = snd_timer_user_open, 2049 .release = snd_timer_user_release, 2050 .llseek = no_llseek, 2051 .poll = snd_timer_user_poll, 2052 .unlocked_ioctl = snd_timer_user_ioctl, 2053 .compat_ioctl = snd_timer_user_ioctl_compat, 2054 .fasync = snd_timer_user_fasync, 2055 }; 2056 2057 /* unregister the system timer */ 2058 static void snd_timer_free_all(void) 2059 { 2060 struct snd_timer *timer, *n; 2061 2062 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2063 snd_timer_free(timer); 2064 } 2065 2066 static struct device timer_dev; 2067 2068 /* 2069 * ENTRY functions 2070 */ 2071 2072 static int __init alsa_timer_init(void) 2073 { 2074 int err; 2075 2076 snd_device_initialize(&timer_dev, NULL); 2077 dev_set_name(&timer_dev, "timer"); 2078 2079 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2080 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2081 "system timer"); 2082 #endif 2083 2084 err = snd_timer_register_system(); 2085 if (err < 0) { 2086 pr_err("ALSA: unable to register system timer (%i)\n", err); 2087 put_device(&timer_dev); 2088 return err; 2089 } 2090 2091 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2092 &snd_timer_f_ops, NULL, &timer_dev); 2093 if (err < 0) { 2094 pr_err("ALSA: unable to register timer device (%i)\n", err); 2095 snd_timer_free_all(); 2096 put_device(&timer_dev); 2097 return err; 2098 } 2099 2100 snd_timer_proc_init(); 2101 return 0; 2102 } 2103 2104 static void __exit alsa_timer_exit(void) 2105 { 2106 snd_unregister_device(&timer_dev); 2107 snd_timer_free_all(); 2108 put_device(&timer_dev); 2109 snd_timer_proc_done(); 2110 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2111 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2112 #endif 2113 } 2114 2115 module_init(alsa_timer_init) 2116 module_exit(alsa_timer_exit) 2117 2118 EXPORT_SYMBOL(snd_timer_open); 2119 EXPORT_SYMBOL(snd_timer_close); 2120 EXPORT_SYMBOL(snd_timer_resolution); 2121 EXPORT_SYMBOL(snd_timer_start); 2122 EXPORT_SYMBOL(snd_timer_stop); 2123 EXPORT_SYMBOL(snd_timer_continue); 2124 EXPORT_SYMBOL(snd_timer_pause); 2125 EXPORT_SYMBOL(snd_timer_new); 2126 EXPORT_SYMBOL(snd_timer_notify); 2127 EXPORT_SYMBOL(snd_timer_global_new); 2128 EXPORT_SYMBOL(snd_timer_global_free); 2129 EXPORT_SYMBOL(snd_timer_global_register); 2130 EXPORT_SYMBOL(snd_timer_interrupt); 2131