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 #if IS_ENABLED(CONFIG_SND_HRTIMER) 39 #define DEFAULT_TIMER_LIMIT 4 40 #elif IS_ENABLED(CONFIG_SND_RTCTIMER) 41 #define DEFAULT_TIMER_LIMIT 2 42 #else 43 #define DEFAULT_TIMER_LIMIT 1 44 #endif 45 46 static int timer_limit = DEFAULT_TIMER_LIMIT; 47 static int timer_tstamp_monotonic = 1; 48 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>"); 49 MODULE_DESCRIPTION("ALSA timer interface"); 50 MODULE_LICENSE("GPL"); 51 module_param(timer_limit, int, 0444); 52 MODULE_PARM_DESC(timer_limit, "Maximum global timers in system."); 53 module_param(timer_tstamp_monotonic, int, 0444); 54 MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for timestamps (default)."); 55 56 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); 57 MODULE_ALIAS("devname:snd/timer"); 58 59 struct snd_timer_user { 60 struct snd_timer_instance *timeri; 61 int tread; /* enhanced read with timestamps and events */ 62 unsigned long ticks; 63 unsigned long overrun; 64 int qhead; 65 int qtail; 66 int qused; 67 int queue_size; 68 bool disconnected; 69 struct snd_timer_read *queue; 70 struct snd_timer_tread *tqueue; 71 spinlock_t qlock; 72 unsigned long last_resolution; 73 unsigned int filter; 74 struct timespec tstamp; /* trigger tstamp */ 75 wait_queue_head_t qchange_sleep; 76 struct fasync_struct *fasync; 77 struct mutex ioctl_lock; 78 }; 79 80 /* list of timers */ 81 static LIST_HEAD(snd_timer_list); 82 83 /* list of slave instances */ 84 static LIST_HEAD(snd_timer_slave_list); 85 86 /* lock for slave active lists */ 87 static DEFINE_SPINLOCK(slave_active_lock); 88 89 static DEFINE_MUTEX(register_mutex); 90 91 static int snd_timer_free(struct snd_timer *timer); 92 static int snd_timer_dev_free(struct snd_device *device); 93 static int snd_timer_dev_register(struct snd_device *device); 94 static int snd_timer_dev_disconnect(struct snd_device *device); 95 96 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left); 97 98 /* 99 * create a timer instance with the given owner string. 100 * when timer is not NULL, increments the module counter 101 */ 102 static struct snd_timer_instance *snd_timer_instance_new(char *owner, 103 struct snd_timer *timer) 104 { 105 struct snd_timer_instance *timeri; 106 timeri = kzalloc(sizeof(*timeri), GFP_KERNEL); 107 if (timeri == NULL) 108 return NULL; 109 timeri->owner = kstrdup(owner, GFP_KERNEL); 110 if (! timeri->owner) { 111 kfree(timeri); 112 return NULL; 113 } 114 INIT_LIST_HEAD(&timeri->open_list); 115 INIT_LIST_HEAD(&timeri->active_list); 116 INIT_LIST_HEAD(&timeri->ack_list); 117 INIT_LIST_HEAD(&timeri->slave_list_head); 118 INIT_LIST_HEAD(&timeri->slave_active_head); 119 120 timeri->timer = timer; 121 if (timer && !try_module_get(timer->module)) { 122 kfree(timeri->owner); 123 kfree(timeri); 124 return NULL; 125 } 126 127 return timeri; 128 } 129 130 /* 131 * find a timer instance from the given timer id 132 */ 133 static struct snd_timer *snd_timer_find(struct snd_timer_id *tid) 134 { 135 struct snd_timer *timer = NULL; 136 137 list_for_each_entry(timer, &snd_timer_list, device_list) { 138 if (timer->tmr_class != tid->dev_class) 139 continue; 140 if ((timer->tmr_class == SNDRV_TIMER_CLASS_CARD || 141 timer->tmr_class == SNDRV_TIMER_CLASS_PCM) && 142 (timer->card == NULL || 143 timer->card->number != tid->card)) 144 continue; 145 if (timer->tmr_device != tid->device) 146 continue; 147 if (timer->tmr_subdevice != tid->subdevice) 148 continue; 149 return timer; 150 } 151 return NULL; 152 } 153 154 #ifdef CONFIG_MODULES 155 156 static void snd_timer_request(struct snd_timer_id *tid) 157 { 158 switch (tid->dev_class) { 159 case SNDRV_TIMER_CLASS_GLOBAL: 160 if (tid->device < timer_limit) 161 request_module("snd-timer-%i", tid->device); 162 break; 163 case SNDRV_TIMER_CLASS_CARD: 164 case SNDRV_TIMER_CLASS_PCM: 165 if (tid->card < snd_ecards_limit) 166 request_module("snd-card-%i", tid->card); 167 break; 168 default: 169 break; 170 } 171 } 172 173 #endif 174 175 /* 176 * look for a master instance matching with the slave id of the given slave. 177 * when found, relink the open_link of the slave. 178 * 179 * call this with register_mutex down. 180 */ 181 static void snd_timer_check_slave(struct snd_timer_instance *slave) 182 { 183 struct snd_timer *timer; 184 struct snd_timer_instance *master; 185 186 /* FIXME: it's really dumb to look up all entries.. */ 187 list_for_each_entry(timer, &snd_timer_list, device_list) { 188 list_for_each_entry(master, &timer->open_list_head, open_list) { 189 if (slave->slave_class == master->slave_class && 190 slave->slave_id == master->slave_id) { 191 list_move_tail(&slave->open_list, 192 &master->slave_list_head); 193 spin_lock_irq(&slave_active_lock); 194 slave->master = master; 195 slave->timer = master->timer; 196 spin_unlock_irq(&slave_active_lock); 197 return; 198 } 199 } 200 } 201 } 202 203 /* 204 * look for slave instances matching with the slave id of the given master. 205 * when found, relink the open_link of slaves. 206 * 207 * call this with register_mutex down. 208 */ 209 static void snd_timer_check_master(struct snd_timer_instance *master) 210 { 211 struct snd_timer_instance *slave, *tmp; 212 213 /* check all pending slaves */ 214 list_for_each_entry_safe(slave, tmp, &snd_timer_slave_list, open_list) { 215 if (slave->slave_class == master->slave_class && 216 slave->slave_id == master->slave_id) { 217 list_move_tail(&slave->open_list, &master->slave_list_head); 218 spin_lock_irq(&slave_active_lock); 219 spin_lock(&master->timer->lock); 220 slave->master = master; 221 slave->timer = master->timer; 222 if (slave->flags & SNDRV_TIMER_IFLG_RUNNING) 223 list_add_tail(&slave->active_list, 224 &master->slave_active_head); 225 spin_unlock(&master->timer->lock); 226 spin_unlock_irq(&slave_active_lock); 227 } 228 } 229 } 230 231 /* 232 * open a timer instance 233 * when opening a master, the slave id must be here given. 234 */ 235 int snd_timer_open(struct snd_timer_instance **ti, 236 char *owner, struct snd_timer_id *tid, 237 unsigned int slave_id) 238 { 239 struct snd_timer *timer; 240 struct snd_timer_instance *timeri = NULL; 241 242 if (tid->dev_class == SNDRV_TIMER_CLASS_SLAVE) { 243 /* open a slave instance */ 244 if (tid->dev_sclass <= SNDRV_TIMER_SCLASS_NONE || 245 tid->dev_sclass > SNDRV_TIMER_SCLASS_OSS_SEQUENCER) { 246 pr_debug("ALSA: timer: invalid slave class %i\n", 247 tid->dev_sclass); 248 return -EINVAL; 249 } 250 mutex_lock(®ister_mutex); 251 timeri = snd_timer_instance_new(owner, NULL); 252 if (!timeri) { 253 mutex_unlock(®ister_mutex); 254 return -ENOMEM; 255 } 256 timeri->slave_class = tid->dev_sclass; 257 timeri->slave_id = tid->device; 258 timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; 259 list_add_tail(&timeri->open_list, &snd_timer_slave_list); 260 snd_timer_check_slave(timeri); 261 mutex_unlock(®ister_mutex); 262 *ti = timeri; 263 return 0; 264 } 265 266 /* open a master instance */ 267 mutex_lock(®ister_mutex); 268 timer = snd_timer_find(tid); 269 #ifdef CONFIG_MODULES 270 if (!timer) { 271 mutex_unlock(®ister_mutex); 272 snd_timer_request(tid); 273 mutex_lock(®ister_mutex); 274 timer = snd_timer_find(tid); 275 } 276 #endif 277 if (!timer) { 278 mutex_unlock(®ister_mutex); 279 return -ENODEV; 280 } 281 if (!list_empty(&timer->open_list_head)) { 282 timeri = list_entry(timer->open_list_head.next, 283 struct snd_timer_instance, open_list); 284 if (timeri->flags & SNDRV_TIMER_IFLG_EXCLUSIVE) { 285 mutex_unlock(®ister_mutex); 286 return -EBUSY; 287 } 288 } 289 timeri = snd_timer_instance_new(owner, timer); 290 if (!timeri) { 291 mutex_unlock(®ister_mutex); 292 return -ENOMEM; 293 } 294 /* take a card refcount for safe disconnection */ 295 if (timer->card) 296 get_device(&timer->card->card_dev); 297 timeri->slave_class = tid->dev_sclass; 298 timeri->slave_id = slave_id; 299 if (list_empty(&timer->open_list_head) && timer->hw.open) 300 timer->hw.open(timer); 301 list_add_tail(&timeri->open_list, &timer->open_list_head); 302 snd_timer_check_master(timeri); 303 mutex_unlock(®ister_mutex); 304 *ti = timeri; 305 return 0; 306 } 307 308 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event); 309 310 /* 311 * close a timer instance 312 */ 313 int snd_timer_close(struct snd_timer_instance *timeri) 314 { 315 struct snd_timer *timer = NULL; 316 struct snd_timer_instance *slave, *tmp; 317 318 if (snd_BUG_ON(!timeri)) 319 return -ENXIO; 320 321 /* force to stop the timer */ 322 snd_timer_stop(timeri); 323 324 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 325 /* wait, until the active callback is finished */ 326 spin_lock_irq(&slave_active_lock); 327 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 328 spin_unlock_irq(&slave_active_lock); 329 udelay(10); 330 spin_lock_irq(&slave_active_lock); 331 } 332 spin_unlock_irq(&slave_active_lock); 333 mutex_lock(®ister_mutex); 334 list_del(&timeri->open_list); 335 mutex_unlock(®ister_mutex); 336 } else { 337 timer = timeri->timer; 338 if (snd_BUG_ON(!timer)) 339 goto out; 340 /* wait, until the active callback is finished */ 341 spin_lock_irq(&timer->lock); 342 while (timeri->flags & SNDRV_TIMER_IFLG_CALLBACK) { 343 spin_unlock_irq(&timer->lock); 344 udelay(10); 345 spin_lock_irq(&timer->lock); 346 } 347 spin_unlock_irq(&timer->lock); 348 mutex_lock(®ister_mutex); 349 list_del(&timeri->open_list); 350 if (list_empty(&timer->open_list_head) && 351 timer->hw.close) 352 timer->hw.close(timer); 353 /* remove slave links */ 354 spin_lock_irq(&slave_active_lock); 355 spin_lock(&timer->lock); 356 list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, 357 open_list) { 358 list_move_tail(&slave->open_list, &snd_timer_slave_list); 359 slave->master = NULL; 360 slave->timer = NULL; 361 list_del_init(&slave->ack_list); 362 list_del_init(&slave->active_list); 363 } 364 spin_unlock(&timer->lock); 365 spin_unlock_irq(&slave_active_lock); 366 /* release a card refcount for safe disconnection */ 367 if (timer->card) 368 put_device(&timer->card->card_dev); 369 mutex_unlock(®ister_mutex); 370 } 371 out: 372 if (timeri->private_free) 373 timeri->private_free(timeri); 374 kfree(timeri->owner); 375 kfree(timeri); 376 if (timer) 377 module_put(timer->module); 378 return 0; 379 } 380 381 unsigned long snd_timer_resolution(struct snd_timer_instance *timeri) 382 { 383 struct snd_timer * timer; 384 385 if (timeri == NULL) 386 return 0; 387 if ((timer = timeri->timer) != NULL) { 388 if (timer->hw.c_resolution) 389 return timer->hw.c_resolution(timer); 390 return timer->hw.resolution; 391 } 392 return 0; 393 } 394 395 static void snd_timer_notify1(struct snd_timer_instance *ti, int event) 396 { 397 struct snd_timer *timer; 398 unsigned long flags; 399 unsigned long resolution = 0; 400 struct snd_timer_instance *ts; 401 struct timespec tstamp; 402 403 if (timer_tstamp_monotonic) 404 ktime_get_ts(&tstamp); 405 else 406 getnstimeofday(&tstamp); 407 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || 408 event > SNDRV_TIMER_EVENT_PAUSE)) 409 return; 410 if (event == SNDRV_TIMER_EVENT_START || 411 event == SNDRV_TIMER_EVENT_CONTINUE) 412 resolution = snd_timer_resolution(ti); 413 if (ti->ccallback) 414 ti->ccallback(ti, event, &tstamp, resolution); 415 if (ti->flags & SNDRV_TIMER_IFLG_SLAVE) 416 return; 417 timer = ti->timer; 418 if (timer == NULL) 419 return; 420 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 421 return; 422 spin_lock_irqsave(&timer->lock, flags); 423 list_for_each_entry(ts, &ti->slave_active_head, active_list) 424 if (ts->ccallback) 425 ts->ccallback(ti, event + 100, &tstamp, resolution); 426 spin_unlock_irqrestore(&timer->lock, flags); 427 } 428 429 static int snd_timer_start1(struct snd_timer *timer, struct snd_timer_instance *timeri, 430 unsigned long sticks) 431 { 432 list_move_tail(&timeri->active_list, &timer->active_list_head); 433 if (timer->running) { 434 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 435 goto __start_now; 436 timer->flags |= SNDRV_TIMER_FLG_RESCHED; 437 timeri->flags |= SNDRV_TIMER_IFLG_START; 438 return 1; /* delayed start */ 439 } else { 440 timer->sticks = sticks; 441 timer->hw.start(timer); 442 __start_now: 443 timer->running++; 444 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 445 return 0; 446 } 447 } 448 449 static int snd_timer_start_slave(struct snd_timer_instance *timeri) 450 { 451 unsigned long flags; 452 453 spin_lock_irqsave(&slave_active_lock, flags); 454 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 455 spin_unlock_irqrestore(&slave_active_lock, flags); 456 return -EBUSY; 457 } 458 timeri->flags |= SNDRV_TIMER_IFLG_RUNNING; 459 if (timeri->master && timeri->timer) { 460 spin_lock(&timeri->timer->lock); 461 list_add_tail(&timeri->active_list, 462 &timeri->master->slave_active_head); 463 spin_unlock(&timeri->timer->lock); 464 } 465 spin_unlock_irqrestore(&slave_active_lock, flags); 466 return 1; /* delayed start */ 467 } 468 469 /* 470 * start the timer instance 471 */ 472 int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks) 473 { 474 struct snd_timer *timer; 475 int result = -EINVAL; 476 unsigned long flags; 477 478 if (timeri == NULL || ticks < 1) 479 return -EINVAL; 480 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 481 result = snd_timer_start_slave(timeri); 482 if (result >= 0) 483 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 484 return result; 485 } 486 timer = timeri->timer; 487 if (timer == NULL) 488 return -EINVAL; 489 if (timer->card && timer->card->shutdown) 490 return -ENODEV; 491 spin_lock_irqsave(&timer->lock, flags); 492 if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 493 SNDRV_TIMER_IFLG_START)) { 494 result = -EBUSY; 495 goto unlock; 496 } 497 timeri->ticks = timeri->cticks = ticks; 498 timeri->pticks = 0; 499 result = snd_timer_start1(timer, timeri, ticks); 500 unlock: 501 spin_unlock_irqrestore(&timer->lock, flags); 502 if (result >= 0) 503 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_START); 504 return result; 505 } 506 507 static int _snd_timer_stop(struct snd_timer_instance *timeri, int event) 508 { 509 struct snd_timer *timer; 510 unsigned long flags; 511 512 if (snd_BUG_ON(!timeri)) 513 return -ENXIO; 514 515 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) { 516 spin_lock_irqsave(&slave_active_lock, flags); 517 if (!(timeri->flags & SNDRV_TIMER_IFLG_RUNNING)) { 518 spin_unlock_irqrestore(&slave_active_lock, flags); 519 return -EBUSY; 520 } 521 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 522 list_del_init(&timeri->ack_list); 523 list_del_init(&timeri->active_list); 524 spin_unlock_irqrestore(&slave_active_lock, flags); 525 goto __end; 526 } 527 timer = timeri->timer; 528 if (!timer) 529 return -EINVAL; 530 spin_lock_irqsave(&timer->lock, flags); 531 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 532 SNDRV_TIMER_IFLG_START))) { 533 spin_unlock_irqrestore(&timer->lock, flags); 534 return -EBUSY; 535 } 536 list_del_init(&timeri->ack_list); 537 list_del_init(&timeri->active_list); 538 if (timer->card && timer->card->shutdown) { 539 spin_unlock_irqrestore(&timer->lock, flags); 540 return 0; 541 } 542 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 543 !(--timer->running)) { 544 timer->hw.stop(timer); 545 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 546 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 547 snd_timer_reschedule(timer, 0); 548 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 549 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 550 timer->hw.start(timer); 551 } 552 } 553 } 554 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 555 spin_unlock_irqrestore(&timer->lock, flags); 556 __end: 557 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 558 snd_timer_notify1(timeri, event); 559 return 0; 560 } 561 562 /* 563 * stop the timer instance. 564 * 565 * do not call this from the timer callback! 566 */ 567 int snd_timer_stop(struct snd_timer_instance *timeri) 568 { 569 struct snd_timer *timer; 570 unsigned long flags; 571 int err; 572 573 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP); 574 if (err < 0) 575 return err; 576 timer = timeri->timer; 577 if (!timer) 578 return -EINVAL; 579 spin_lock_irqsave(&timer->lock, flags); 580 timeri->cticks = timeri->ticks; 581 timeri->pticks = 0; 582 spin_unlock_irqrestore(&timer->lock, flags); 583 return 0; 584 } 585 586 /* 587 * start again.. the tick is kept. 588 */ 589 int snd_timer_continue(struct snd_timer_instance *timeri) 590 { 591 struct snd_timer *timer; 592 int result = -EINVAL; 593 unsigned long flags; 594 595 if (timeri == NULL) 596 return result; 597 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 598 return snd_timer_start_slave(timeri); 599 timer = timeri->timer; 600 if (! timer) 601 return -EINVAL; 602 if (timer->card && timer->card->shutdown) 603 return -ENODEV; 604 spin_lock_irqsave(&timer->lock, flags); 605 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 606 result = -EBUSY; 607 goto unlock; 608 } 609 if (!timeri->cticks) 610 timeri->cticks = 1; 611 timeri->pticks = 0; 612 result = snd_timer_start1(timer, timeri, timer->sticks); 613 unlock: 614 spin_unlock_irqrestore(&timer->lock, flags); 615 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 616 return result; 617 } 618 619 /* 620 * pause.. remember the ticks left 621 */ 622 int snd_timer_pause(struct snd_timer_instance * timeri) 623 { 624 return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE); 625 } 626 627 /* 628 * reschedule the timer 629 * 630 * start pending instances and check the scheduling ticks. 631 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 632 */ 633 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 634 { 635 struct snd_timer_instance *ti; 636 unsigned long ticks = ~0UL; 637 638 list_for_each_entry(ti, &timer->active_list_head, active_list) { 639 if (ti->flags & SNDRV_TIMER_IFLG_START) { 640 ti->flags &= ~SNDRV_TIMER_IFLG_START; 641 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 642 timer->running++; 643 } 644 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 645 if (ticks > ti->cticks) 646 ticks = ti->cticks; 647 } 648 } 649 if (ticks == ~0UL) { 650 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 651 return; 652 } 653 if (ticks > timer->hw.ticks) 654 ticks = timer->hw.ticks; 655 if (ticks_left != ticks) 656 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 657 timer->sticks = ticks; 658 } 659 660 /* 661 * timer tasklet 662 * 663 */ 664 static void snd_timer_tasklet(unsigned long arg) 665 { 666 struct snd_timer *timer = (struct snd_timer *) arg; 667 struct snd_timer_instance *ti; 668 struct list_head *p; 669 unsigned long resolution, ticks; 670 unsigned long flags; 671 672 if (timer->card && timer->card->shutdown) 673 return; 674 675 spin_lock_irqsave(&timer->lock, flags); 676 /* now process all callbacks */ 677 while (!list_empty(&timer->sack_list_head)) { 678 p = timer->sack_list_head.next; /* get first item */ 679 ti = list_entry(p, struct snd_timer_instance, ack_list); 680 681 /* remove from ack_list and make empty */ 682 list_del_init(p); 683 684 ticks = ti->pticks; 685 ti->pticks = 0; 686 resolution = ti->resolution; 687 688 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 689 spin_unlock(&timer->lock); 690 if (ti->callback) 691 ti->callback(ti, resolution, ticks); 692 spin_lock(&timer->lock); 693 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 694 } 695 spin_unlock_irqrestore(&timer->lock, flags); 696 } 697 698 /* 699 * timer interrupt 700 * 701 * ticks_left is usually equal to timer->sticks. 702 * 703 */ 704 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 705 { 706 struct snd_timer_instance *ti, *ts, *tmp; 707 unsigned long resolution, ticks; 708 struct list_head *p, *ack_list_head; 709 unsigned long flags; 710 int use_tasklet = 0; 711 712 if (timer == NULL) 713 return; 714 715 if (timer->card && timer->card->shutdown) 716 return; 717 718 spin_lock_irqsave(&timer->lock, flags); 719 720 /* remember the current resolution */ 721 if (timer->hw.c_resolution) 722 resolution = timer->hw.c_resolution(timer); 723 else 724 resolution = timer->hw.resolution; 725 726 /* loop for all active instances 727 * Here we cannot use list_for_each_entry because the active_list of a 728 * processed instance is relinked to done_list_head before the callback 729 * is called. 730 */ 731 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 732 active_list) { 733 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 734 continue; 735 ti->pticks += ticks_left; 736 ti->resolution = resolution; 737 if (ti->cticks < ticks_left) 738 ti->cticks = 0; 739 else 740 ti->cticks -= ticks_left; 741 if (ti->cticks) /* not expired */ 742 continue; 743 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 744 ti->cticks = ti->ticks; 745 } else { 746 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 747 --timer->running; 748 list_del_init(&ti->active_list); 749 } 750 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 751 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 752 ack_list_head = &timer->ack_list_head; 753 else 754 ack_list_head = &timer->sack_list_head; 755 if (list_empty(&ti->ack_list)) 756 list_add_tail(&ti->ack_list, ack_list_head); 757 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 758 ts->pticks = ti->pticks; 759 ts->resolution = resolution; 760 if (list_empty(&ts->ack_list)) 761 list_add_tail(&ts->ack_list, ack_list_head); 762 } 763 } 764 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 765 snd_timer_reschedule(timer, timer->sticks); 766 if (timer->running) { 767 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 768 timer->hw.stop(timer); 769 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 770 } 771 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 772 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 773 /* restart timer */ 774 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 775 timer->hw.start(timer); 776 } 777 } else { 778 timer->hw.stop(timer); 779 } 780 781 /* now process all fast callbacks */ 782 while (!list_empty(&timer->ack_list_head)) { 783 p = timer->ack_list_head.next; /* get first item */ 784 ti = list_entry(p, struct snd_timer_instance, ack_list); 785 786 /* remove from ack_list and make empty */ 787 list_del_init(p); 788 789 ticks = ti->pticks; 790 ti->pticks = 0; 791 792 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 793 spin_unlock(&timer->lock); 794 if (ti->callback) 795 ti->callback(ti, resolution, ticks); 796 spin_lock(&timer->lock); 797 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 798 } 799 800 /* do we have any slow callbacks? */ 801 use_tasklet = !list_empty(&timer->sack_list_head); 802 spin_unlock_irqrestore(&timer->lock, flags); 803 804 if (use_tasklet) 805 tasklet_schedule(&timer->task_queue); 806 } 807 808 /* 809 810 */ 811 812 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 813 struct snd_timer **rtimer) 814 { 815 struct snd_timer *timer; 816 int err; 817 static struct snd_device_ops ops = { 818 .dev_free = snd_timer_dev_free, 819 .dev_register = snd_timer_dev_register, 820 .dev_disconnect = snd_timer_dev_disconnect, 821 }; 822 823 if (snd_BUG_ON(!tid)) 824 return -EINVAL; 825 if (rtimer) 826 *rtimer = NULL; 827 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 828 if (!timer) 829 return -ENOMEM; 830 timer->tmr_class = tid->dev_class; 831 timer->card = card; 832 timer->tmr_device = tid->device; 833 timer->tmr_subdevice = tid->subdevice; 834 if (id) 835 strlcpy(timer->id, id, sizeof(timer->id)); 836 INIT_LIST_HEAD(&timer->device_list); 837 INIT_LIST_HEAD(&timer->open_list_head); 838 INIT_LIST_HEAD(&timer->active_list_head); 839 INIT_LIST_HEAD(&timer->ack_list_head); 840 INIT_LIST_HEAD(&timer->sack_list_head); 841 spin_lock_init(&timer->lock); 842 tasklet_init(&timer->task_queue, snd_timer_tasklet, 843 (unsigned long)timer); 844 if (card != NULL) { 845 timer->module = card->module; 846 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 847 if (err < 0) { 848 snd_timer_free(timer); 849 return err; 850 } 851 } 852 if (rtimer) 853 *rtimer = timer; 854 return 0; 855 } 856 857 static int snd_timer_free(struct snd_timer *timer) 858 { 859 if (!timer) 860 return 0; 861 862 mutex_lock(®ister_mutex); 863 if (! list_empty(&timer->open_list_head)) { 864 struct list_head *p, *n; 865 struct snd_timer_instance *ti; 866 pr_warn("ALSA: timer %p is busy?\n", timer); 867 list_for_each_safe(p, n, &timer->open_list_head) { 868 list_del_init(p); 869 ti = list_entry(p, struct snd_timer_instance, open_list); 870 ti->timer = NULL; 871 } 872 } 873 list_del(&timer->device_list); 874 mutex_unlock(®ister_mutex); 875 876 if (timer->private_free) 877 timer->private_free(timer); 878 kfree(timer); 879 return 0; 880 } 881 882 static int snd_timer_dev_free(struct snd_device *device) 883 { 884 struct snd_timer *timer = device->device_data; 885 return snd_timer_free(timer); 886 } 887 888 static int snd_timer_dev_register(struct snd_device *dev) 889 { 890 struct snd_timer *timer = dev->device_data; 891 struct snd_timer *timer1; 892 893 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 894 return -ENXIO; 895 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 896 !timer->hw.resolution && timer->hw.c_resolution == NULL) 897 return -EINVAL; 898 899 mutex_lock(®ister_mutex); 900 list_for_each_entry(timer1, &snd_timer_list, device_list) { 901 if (timer1->tmr_class > timer->tmr_class) 902 break; 903 if (timer1->tmr_class < timer->tmr_class) 904 continue; 905 if (timer1->card && timer->card) { 906 if (timer1->card->number > timer->card->number) 907 break; 908 if (timer1->card->number < timer->card->number) 909 continue; 910 } 911 if (timer1->tmr_device > timer->tmr_device) 912 break; 913 if (timer1->tmr_device < timer->tmr_device) 914 continue; 915 if (timer1->tmr_subdevice > timer->tmr_subdevice) 916 break; 917 if (timer1->tmr_subdevice < timer->tmr_subdevice) 918 continue; 919 /* conflicts.. */ 920 mutex_unlock(®ister_mutex); 921 return -EBUSY; 922 } 923 list_add_tail(&timer->device_list, &timer1->device_list); 924 mutex_unlock(®ister_mutex); 925 return 0; 926 } 927 928 static int snd_timer_dev_disconnect(struct snd_device *device) 929 { 930 struct snd_timer *timer = device->device_data; 931 struct snd_timer_instance *ti; 932 933 mutex_lock(®ister_mutex); 934 list_del_init(&timer->device_list); 935 /* wake up pending sleepers */ 936 list_for_each_entry(ti, &timer->open_list_head, open_list) { 937 if (ti->disconnect) 938 ti->disconnect(ti); 939 } 940 mutex_unlock(®ister_mutex); 941 return 0; 942 } 943 944 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 945 { 946 unsigned long flags; 947 unsigned long resolution = 0; 948 struct snd_timer_instance *ti, *ts; 949 950 if (timer->card && timer->card->shutdown) 951 return; 952 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 953 return; 954 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 955 event > SNDRV_TIMER_EVENT_MRESUME)) 956 return; 957 spin_lock_irqsave(&timer->lock, flags); 958 if (event == SNDRV_TIMER_EVENT_MSTART || 959 event == SNDRV_TIMER_EVENT_MCONTINUE || 960 event == SNDRV_TIMER_EVENT_MRESUME) { 961 if (timer->hw.c_resolution) 962 resolution = timer->hw.c_resolution(timer); 963 else 964 resolution = timer->hw.resolution; 965 } 966 list_for_each_entry(ti, &timer->active_list_head, active_list) { 967 if (ti->ccallback) 968 ti->ccallback(ti, event, tstamp, resolution); 969 list_for_each_entry(ts, &ti->slave_active_head, active_list) 970 if (ts->ccallback) 971 ts->ccallback(ts, event, tstamp, resolution); 972 } 973 spin_unlock_irqrestore(&timer->lock, flags); 974 } 975 976 /* 977 * exported functions for global timers 978 */ 979 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 980 { 981 struct snd_timer_id tid; 982 983 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 984 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 985 tid.card = -1; 986 tid.device = device; 987 tid.subdevice = 0; 988 return snd_timer_new(NULL, id, &tid, rtimer); 989 } 990 991 int snd_timer_global_free(struct snd_timer *timer) 992 { 993 return snd_timer_free(timer); 994 } 995 996 int snd_timer_global_register(struct snd_timer *timer) 997 { 998 struct snd_device dev; 999 1000 memset(&dev, 0, sizeof(dev)); 1001 dev.device_data = timer; 1002 return snd_timer_dev_register(&dev); 1003 } 1004 1005 /* 1006 * System timer 1007 */ 1008 1009 struct snd_timer_system_private { 1010 struct timer_list tlist; 1011 unsigned long last_expires; 1012 unsigned long last_jiffies; 1013 unsigned long correction; 1014 }; 1015 1016 static void snd_timer_s_function(unsigned long data) 1017 { 1018 struct snd_timer *timer = (struct snd_timer *)data; 1019 struct snd_timer_system_private *priv = timer->private_data; 1020 unsigned long jiff = jiffies; 1021 if (time_after(jiff, priv->last_expires)) 1022 priv->correction += (long)jiff - (long)priv->last_expires; 1023 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1024 } 1025 1026 static int snd_timer_s_start(struct snd_timer * timer) 1027 { 1028 struct snd_timer_system_private *priv; 1029 unsigned long njiff; 1030 1031 priv = (struct snd_timer_system_private *) timer->private_data; 1032 njiff = (priv->last_jiffies = jiffies); 1033 if (priv->correction > timer->sticks - 1) { 1034 priv->correction -= timer->sticks - 1; 1035 njiff++; 1036 } else { 1037 njiff += timer->sticks - priv->correction; 1038 priv->correction = 0; 1039 } 1040 priv->last_expires = priv->tlist.expires = njiff; 1041 add_timer(&priv->tlist); 1042 return 0; 1043 } 1044 1045 static int snd_timer_s_stop(struct snd_timer * timer) 1046 { 1047 struct snd_timer_system_private *priv; 1048 unsigned long jiff; 1049 1050 priv = (struct snd_timer_system_private *) timer->private_data; 1051 del_timer(&priv->tlist); 1052 jiff = jiffies; 1053 if (time_before(jiff, priv->last_expires)) 1054 timer->sticks = priv->last_expires - jiff; 1055 else 1056 timer->sticks = 1; 1057 priv->correction = 0; 1058 return 0; 1059 } 1060 1061 static int snd_timer_s_close(struct snd_timer *timer) 1062 { 1063 struct snd_timer_system_private *priv; 1064 1065 priv = (struct snd_timer_system_private *)timer->private_data; 1066 del_timer_sync(&priv->tlist); 1067 return 0; 1068 } 1069 1070 static struct snd_timer_hardware snd_timer_system = 1071 { 1072 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1073 .resolution = 1000000000L / HZ, 1074 .ticks = 10000000L, 1075 .close = snd_timer_s_close, 1076 .start = snd_timer_s_start, 1077 .stop = snd_timer_s_stop 1078 }; 1079 1080 static void snd_timer_free_system(struct snd_timer *timer) 1081 { 1082 kfree(timer->private_data); 1083 } 1084 1085 static int snd_timer_register_system(void) 1086 { 1087 struct snd_timer *timer; 1088 struct snd_timer_system_private *priv; 1089 int err; 1090 1091 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1092 if (err < 0) 1093 return err; 1094 strcpy(timer->name, "system timer"); 1095 timer->hw = snd_timer_system; 1096 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1097 if (priv == NULL) { 1098 snd_timer_free(timer); 1099 return -ENOMEM; 1100 } 1101 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1102 timer->private_data = priv; 1103 timer->private_free = snd_timer_free_system; 1104 return snd_timer_global_register(timer); 1105 } 1106 1107 #ifdef CONFIG_SND_PROC_FS 1108 /* 1109 * Info interface 1110 */ 1111 1112 static void snd_timer_proc_read(struct snd_info_entry *entry, 1113 struct snd_info_buffer *buffer) 1114 { 1115 struct snd_timer *timer; 1116 struct snd_timer_instance *ti; 1117 1118 mutex_lock(®ister_mutex); 1119 list_for_each_entry(timer, &snd_timer_list, device_list) { 1120 if (timer->card && timer->card->shutdown) 1121 continue; 1122 switch (timer->tmr_class) { 1123 case SNDRV_TIMER_CLASS_GLOBAL: 1124 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1125 break; 1126 case SNDRV_TIMER_CLASS_CARD: 1127 snd_iprintf(buffer, "C%i-%i: ", 1128 timer->card->number, timer->tmr_device); 1129 break; 1130 case SNDRV_TIMER_CLASS_PCM: 1131 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1132 timer->tmr_device, timer->tmr_subdevice); 1133 break; 1134 default: 1135 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1136 timer->card ? timer->card->number : -1, 1137 timer->tmr_device, timer->tmr_subdevice); 1138 } 1139 snd_iprintf(buffer, "%s :", timer->name); 1140 if (timer->hw.resolution) 1141 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1142 timer->hw.resolution / 1000, 1143 timer->hw.resolution % 1000, 1144 timer->hw.ticks); 1145 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1146 snd_iprintf(buffer, " SLAVE"); 1147 snd_iprintf(buffer, "\n"); 1148 list_for_each_entry(ti, &timer->open_list_head, open_list) 1149 snd_iprintf(buffer, " Client %s : %s\n", 1150 ti->owner ? ti->owner : "unknown", 1151 ti->flags & (SNDRV_TIMER_IFLG_START | 1152 SNDRV_TIMER_IFLG_RUNNING) 1153 ? "running" : "stopped"); 1154 } 1155 mutex_unlock(®ister_mutex); 1156 } 1157 1158 static struct snd_info_entry *snd_timer_proc_entry; 1159 1160 static void __init snd_timer_proc_init(void) 1161 { 1162 struct snd_info_entry *entry; 1163 1164 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1165 if (entry != NULL) { 1166 entry->c.text.read = snd_timer_proc_read; 1167 if (snd_info_register(entry) < 0) { 1168 snd_info_free_entry(entry); 1169 entry = NULL; 1170 } 1171 } 1172 snd_timer_proc_entry = entry; 1173 } 1174 1175 static void __exit snd_timer_proc_done(void) 1176 { 1177 snd_info_free_entry(snd_timer_proc_entry); 1178 } 1179 #else /* !CONFIG_SND_PROC_FS */ 1180 #define snd_timer_proc_init() 1181 #define snd_timer_proc_done() 1182 #endif 1183 1184 /* 1185 * USER SPACE interface 1186 */ 1187 1188 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1189 unsigned long resolution, 1190 unsigned long ticks) 1191 { 1192 struct snd_timer_user *tu = timeri->callback_data; 1193 struct snd_timer_read *r; 1194 int prev; 1195 1196 spin_lock(&tu->qlock); 1197 if (tu->qused > 0) { 1198 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1199 r = &tu->queue[prev]; 1200 if (r->resolution == resolution) { 1201 r->ticks += ticks; 1202 goto __wake; 1203 } 1204 } 1205 if (tu->qused >= tu->queue_size) { 1206 tu->overrun++; 1207 } else { 1208 r = &tu->queue[tu->qtail++]; 1209 tu->qtail %= tu->queue_size; 1210 r->resolution = resolution; 1211 r->ticks = ticks; 1212 tu->qused++; 1213 } 1214 __wake: 1215 spin_unlock(&tu->qlock); 1216 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1217 wake_up(&tu->qchange_sleep); 1218 } 1219 1220 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1221 struct snd_timer_tread *tread) 1222 { 1223 if (tu->qused >= tu->queue_size) { 1224 tu->overrun++; 1225 } else { 1226 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1227 tu->qtail %= tu->queue_size; 1228 tu->qused++; 1229 } 1230 } 1231 1232 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1233 int event, 1234 struct timespec *tstamp, 1235 unsigned long resolution) 1236 { 1237 struct snd_timer_user *tu = timeri->callback_data; 1238 struct snd_timer_tread r1; 1239 unsigned long flags; 1240 1241 if (event >= SNDRV_TIMER_EVENT_START && 1242 event <= SNDRV_TIMER_EVENT_PAUSE) 1243 tu->tstamp = *tstamp; 1244 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1245 return; 1246 r1.event = event; 1247 r1.tstamp = *tstamp; 1248 r1.val = resolution; 1249 spin_lock_irqsave(&tu->qlock, flags); 1250 snd_timer_user_append_to_tqueue(tu, &r1); 1251 spin_unlock_irqrestore(&tu->qlock, flags); 1252 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1253 wake_up(&tu->qchange_sleep); 1254 } 1255 1256 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1257 { 1258 struct snd_timer_user *tu = timeri->callback_data; 1259 1260 tu->disconnected = true; 1261 wake_up(&tu->qchange_sleep); 1262 } 1263 1264 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1265 unsigned long resolution, 1266 unsigned long ticks) 1267 { 1268 struct snd_timer_user *tu = timeri->callback_data; 1269 struct snd_timer_tread *r, r1; 1270 struct timespec tstamp; 1271 int prev, append = 0; 1272 1273 memset(&tstamp, 0, sizeof(tstamp)); 1274 spin_lock(&tu->qlock); 1275 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1276 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1277 spin_unlock(&tu->qlock); 1278 return; 1279 } 1280 if (tu->last_resolution != resolution || ticks > 0) { 1281 if (timer_tstamp_monotonic) 1282 ktime_get_ts(&tstamp); 1283 else 1284 getnstimeofday(&tstamp); 1285 } 1286 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1287 tu->last_resolution != resolution) { 1288 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1289 r1.tstamp = tstamp; 1290 r1.val = resolution; 1291 snd_timer_user_append_to_tqueue(tu, &r1); 1292 tu->last_resolution = resolution; 1293 append++; 1294 } 1295 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1296 goto __wake; 1297 if (ticks == 0) 1298 goto __wake; 1299 if (tu->qused > 0) { 1300 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1301 r = &tu->tqueue[prev]; 1302 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1303 r->tstamp = tstamp; 1304 r->val += ticks; 1305 append++; 1306 goto __wake; 1307 } 1308 } 1309 r1.event = SNDRV_TIMER_EVENT_TICK; 1310 r1.tstamp = tstamp; 1311 r1.val = ticks; 1312 snd_timer_user_append_to_tqueue(tu, &r1); 1313 append++; 1314 __wake: 1315 spin_unlock(&tu->qlock); 1316 if (append == 0) 1317 return; 1318 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1319 wake_up(&tu->qchange_sleep); 1320 } 1321 1322 static int snd_timer_user_open(struct inode *inode, struct file *file) 1323 { 1324 struct snd_timer_user *tu; 1325 int err; 1326 1327 err = nonseekable_open(inode, file); 1328 if (err < 0) 1329 return err; 1330 1331 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1332 if (tu == NULL) 1333 return -ENOMEM; 1334 spin_lock_init(&tu->qlock); 1335 init_waitqueue_head(&tu->qchange_sleep); 1336 mutex_init(&tu->ioctl_lock); 1337 tu->ticks = 1; 1338 tu->queue_size = 128; 1339 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1340 GFP_KERNEL); 1341 if (tu->queue == NULL) { 1342 kfree(tu); 1343 return -ENOMEM; 1344 } 1345 file->private_data = tu; 1346 return 0; 1347 } 1348 1349 static int snd_timer_user_release(struct inode *inode, struct file *file) 1350 { 1351 struct snd_timer_user *tu; 1352 1353 if (file->private_data) { 1354 tu = file->private_data; 1355 file->private_data = NULL; 1356 mutex_lock(&tu->ioctl_lock); 1357 if (tu->timeri) 1358 snd_timer_close(tu->timeri); 1359 mutex_unlock(&tu->ioctl_lock); 1360 kfree(tu->queue); 1361 kfree(tu->tqueue); 1362 kfree(tu); 1363 } 1364 return 0; 1365 } 1366 1367 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1368 { 1369 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1370 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1371 id->card = -1; 1372 id->device = -1; 1373 id->subdevice = -1; 1374 } 1375 1376 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1377 { 1378 id->dev_class = timer->tmr_class; 1379 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1380 id->card = timer->card ? timer->card->number : -1; 1381 id->device = timer->tmr_device; 1382 id->subdevice = timer->tmr_subdevice; 1383 } 1384 1385 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1386 { 1387 struct snd_timer_id id; 1388 struct snd_timer *timer; 1389 struct list_head *p; 1390 1391 if (copy_from_user(&id, _tid, sizeof(id))) 1392 return -EFAULT; 1393 mutex_lock(®ister_mutex); 1394 if (id.dev_class < 0) { /* first item */ 1395 if (list_empty(&snd_timer_list)) 1396 snd_timer_user_zero_id(&id); 1397 else { 1398 timer = list_entry(snd_timer_list.next, 1399 struct snd_timer, device_list); 1400 snd_timer_user_copy_id(&id, timer); 1401 } 1402 } else { 1403 switch (id.dev_class) { 1404 case SNDRV_TIMER_CLASS_GLOBAL: 1405 id.device = id.device < 0 ? 0 : id.device + 1; 1406 list_for_each(p, &snd_timer_list) { 1407 timer = list_entry(p, struct snd_timer, device_list); 1408 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1409 snd_timer_user_copy_id(&id, timer); 1410 break; 1411 } 1412 if (timer->tmr_device >= id.device) { 1413 snd_timer_user_copy_id(&id, timer); 1414 break; 1415 } 1416 } 1417 if (p == &snd_timer_list) 1418 snd_timer_user_zero_id(&id); 1419 break; 1420 case SNDRV_TIMER_CLASS_CARD: 1421 case SNDRV_TIMER_CLASS_PCM: 1422 if (id.card < 0) { 1423 id.card = 0; 1424 } else { 1425 if (id.card < 0) { 1426 id.card = 0; 1427 } else { 1428 if (id.device < 0) { 1429 id.device = 0; 1430 } else { 1431 if (id.subdevice < 0) { 1432 id.subdevice = 0; 1433 } else { 1434 id.subdevice++; 1435 } 1436 } 1437 } 1438 } 1439 list_for_each(p, &snd_timer_list) { 1440 timer = list_entry(p, struct snd_timer, device_list); 1441 if (timer->tmr_class > id.dev_class) { 1442 snd_timer_user_copy_id(&id, timer); 1443 break; 1444 } 1445 if (timer->tmr_class < id.dev_class) 1446 continue; 1447 if (timer->card->number > id.card) { 1448 snd_timer_user_copy_id(&id, timer); 1449 break; 1450 } 1451 if (timer->card->number < id.card) 1452 continue; 1453 if (timer->tmr_device > id.device) { 1454 snd_timer_user_copy_id(&id, timer); 1455 break; 1456 } 1457 if (timer->tmr_device < id.device) 1458 continue; 1459 if (timer->tmr_subdevice > id.subdevice) { 1460 snd_timer_user_copy_id(&id, timer); 1461 break; 1462 } 1463 if (timer->tmr_subdevice < id.subdevice) 1464 continue; 1465 snd_timer_user_copy_id(&id, timer); 1466 break; 1467 } 1468 if (p == &snd_timer_list) 1469 snd_timer_user_zero_id(&id); 1470 break; 1471 default: 1472 snd_timer_user_zero_id(&id); 1473 } 1474 } 1475 mutex_unlock(®ister_mutex); 1476 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1477 return -EFAULT; 1478 return 0; 1479 } 1480 1481 static int snd_timer_user_ginfo(struct file *file, 1482 struct snd_timer_ginfo __user *_ginfo) 1483 { 1484 struct snd_timer_ginfo *ginfo; 1485 struct snd_timer_id tid; 1486 struct snd_timer *t; 1487 struct list_head *p; 1488 int err = 0; 1489 1490 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1491 if (IS_ERR(ginfo)) 1492 return PTR_ERR(ginfo); 1493 1494 tid = ginfo->tid; 1495 memset(ginfo, 0, sizeof(*ginfo)); 1496 ginfo->tid = tid; 1497 mutex_lock(®ister_mutex); 1498 t = snd_timer_find(&tid); 1499 if (t != NULL) { 1500 ginfo->card = t->card ? t->card->number : -1; 1501 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1502 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1503 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1504 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1505 ginfo->resolution = t->hw.resolution; 1506 if (t->hw.resolution_min > 0) { 1507 ginfo->resolution_min = t->hw.resolution_min; 1508 ginfo->resolution_max = t->hw.resolution_max; 1509 } 1510 list_for_each(p, &t->open_list_head) { 1511 ginfo->clients++; 1512 } 1513 } else { 1514 err = -ENODEV; 1515 } 1516 mutex_unlock(®ister_mutex); 1517 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1518 err = -EFAULT; 1519 kfree(ginfo); 1520 return err; 1521 } 1522 1523 static int snd_timer_user_gparams(struct file *file, 1524 struct snd_timer_gparams __user *_gparams) 1525 { 1526 struct snd_timer_gparams gparams; 1527 struct snd_timer *t; 1528 int err; 1529 1530 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1531 return -EFAULT; 1532 mutex_lock(®ister_mutex); 1533 t = snd_timer_find(&gparams.tid); 1534 if (!t) { 1535 err = -ENODEV; 1536 goto _error; 1537 } 1538 if (!list_empty(&t->open_list_head)) { 1539 err = -EBUSY; 1540 goto _error; 1541 } 1542 if (!t->hw.set_period) { 1543 err = -ENOSYS; 1544 goto _error; 1545 } 1546 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1547 _error: 1548 mutex_unlock(®ister_mutex); 1549 return err; 1550 } 1551 1552 static int snd_timer_user_gstatus(struct file *file, 1553 struct snd_timer_gstatus __user *_gstatus) 1554 { 1555 struct snd_timer_gstatus gstatus; 1556 struct snd_timer_id tid; 1557 struct snd_timer *t; 1558 int err = 0; 1559 1560 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1561 return -EFAULT; 1562 tid = gstatus.tid; 1563 memset(&gstatus, 0, sizeof(gstatus)); 1564 gstatus.tid = tid; 1565 mutex_lock(®ister_mutex); 1566 t = snd_timer_find(&tid); 1567 if (t != NULL) { 1568 if (t->hw.c_resolution) 1569 gstatus.resolution = t->hw.c_resolution(t); 1570 else 1571 gstatus.resolution = t->hw.resolution; 1572 if (t->hw.precise_resolution) { 1573 t->hw.precise_resolution(t, &gstatus.resolution_num, 1574 &gstatus.resolution_den); 1575 } else { 1576 gstatus.resolution_num = gstatus.resolution; 1577 gstatus.resolution_den = 1000000000uL; 1578 } 1579 } else { 1580 err = -ENODEV; 1581 } 1582 mutex_unlock(®ister_mutex); 1583 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1584 err = -EFAULT; 1585 return err; 1586 } 1587 1588 static int snd_timer_user_tselect(struct file *file, 1589 struct snd_timer_select __user *_tselect) 1590 { 1591 struct snd_timer_user *tu; 1592 struct snd_timer_select tselect; 1593 char str[32]; 1594 int err = 0; 1595 1596 tu = file->private_data; 1597 if (tu->timeri) { 1598 snd_timer_close(tu->timeri); 1599 tu->timeri = NULL; 1600 } 1601 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1602 err = -EFAULT; 1603 goto __err; 1604 } 1605 sprintf(str, "application %i", current->pid); 1606 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1607 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1608 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1609 if (err < 0) 1610 goto __err; 1611 1612 kfree(tu->queue); 1613 tu->queue = NULL; 1614 kfree(tu->tqueue); 1615 tu->tqueue = NULL; 1616 if (tu->tread) { 1617 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1618 GFP_KERNEL); 1619 if (tu->tqueue == NULL) 1620 err = -ENOMEM; 1621 } else { 1622 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1623 GFP_KERNEL); 1624 if (tu->queue == NULL) 1625 err = -ENOMEM; 1626 } 1627 1628 if (err < 0) { 1629 snd_timer_close(tu->timeri); 1630 tu->timeri = NULL; 1631 } else { 1632 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1633 tu->timeri->callback = tu->tread 1634 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1635 tu->timeri->ccallback = snd_timer_user_ccallback; 1636 tu->timeri->callback_data = (void *)tu; 1637 tu->timeri->disconnect = snd_timer_user_disconnect; 1638 } 1639 1640 __err: 1641 return err; 1642 } 1643 1644 static int snd_timer_user_info(struct file *file, 1645 struct snd_timer_info __user *_info) 1646 { 1647 struct snd_timer_user *tu; 1648 struct snd_timer_info *info; 1649 struct snd_timer *t; 1650 int err = 0; 1651 1652 tu = file->private_data; 1653 if (!tu->timeri) 1654 return -EBADFD; 1655 t = tu->timeri->timer; 1656 if (!t) 1657 return -EBADFD; 1658 1659 info = kzalloc(sizeof(*info), GFP_KERNEL); 1660 if (! info) 1661 return -ENOMEM; 1662 info->card = t->card ? t->card->number : -1; 1663 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1664 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1665 strlcpy(info->id, t->id, sizeof(info->id)); 1666 strlcpy(info->name, t->name, sizeof(info->name)); 1667 info->resolution = t->hw.resolution; 1668 if (copy_to_user(_info, info, sizeof(*_info))) 1669 err = -EFAULT; 1670 kfree(info); 1671 return err; 1672 } 1673 1674 static int snd_timer_user_params(struct file *file, 1675 struct snd_timer_params __user *_params) 1676 { 1677 struct snd_timer_user *tu; 1678 struct snd_timer_params params; 1679 struct snd_timer *t; 1680 struct snd_timer_read *tr; 1681 struct snd_timer_tread *ttr; 1682 int err; 1683 1684 tu = file->private_data; 1685 if (!tu->timeri) 1686 return -EBADFD; 1687 t = tu->timeri->timer; 1688 if (!t) 1689 return -EBADFD; 1690 if (copy_from_user(¶ms, _params, sizeof(params))) 1691 return -EFAULT; 1692 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1693 err = -EINVAL; 1694 goto _end; 1695 } 1696 if (params.queue_size > 0 && 1697 (params.queue_size < 32 || params.queue_size > 1024)) { 1698 err = -EINVAL; 1699 goto _end; 1700 } 1701 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1702 (1<<SNDRV_TIMER_EVENT_TICK)| 1703 (1<<SNDRV_TIMER_EVENT_START)| 1704 (1<<SNDRV_TIMER_EVENT_STOP)| 1705 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1706 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1707 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1708 (1<<SNDRV_TIMER_EVENT_RESUME)| 1709 (1<<SNDRV_TIMER_EVENT_MSTART)| 1710 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1711 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1712 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1713 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1714 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1715 err = -EINVAL; 1716 goto _end; 1717 } 1718 snd_timer_stop(tu->timeri); 1719 spin_lock_irq(&t->lock); 1720 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1721 SNDRV_TIMER_IFLG_EXCLUSIVE| 1722 SNDRV_TIMER_IFLG_EARLY_EVENT); 1723 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1724 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1725 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1726 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1727 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1728 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1729 spin_unlock_irq(&t->lock); 1730 if (params.queue_size > 0 && 1731 (unsigned int)tu->queue_size != params.queue_size) { 1732 if (tu->tread) { 1733 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1734 GFP_KERNEL); 1735 if (ttr) { 1736 kfree(tu->tqueue); 1737 tu->queue_size = params.queue_size; 1738 tu->tqueue = ttr; 1739 } 1740 } else { 1741 tr = kmalloc(params.queue_size * sizeof(*tr), 1742 GFP_KERNEL); 1743 if (tr) { 1744 kfree(tu->queue); 1745 tu->queue_size = params.queue_size; 1746 tu->queue = tr; 1747 } 1748 } 1749 } 1750 tu->qhead = tu->qtail = tu->qused = 0; 1751 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1752 if (tu->tread) { 1753 struct snd_timer_tread tread; 1754 tread.event = SNDRV_TIMER_EVENT_EARLY; 1755 tread.tstamp.tv_sec = 0; 1756 tread.tstamp.tv_nsec = 0; 1757 tread.val = 0; 1758 snd_timer_user_append_to_tqueue(tu, &tread); 1759 } else { 1760 struct snd_timer_read *r = &tu->queue[0]; 1761 r->resolution = 0; 1762 r->ticks = 0; 1763 tu->qused++; 1764 tu->qtail++; 1765 } 1766 } 1767 tu->filter = params.filter; 1768 tu->ticks = params.ticks; 1769 err = 0; 1770 _end: 1771 if (copy_to_user(_params, ¶ms, sizeof(params))) 1772 return -EFAULT; 1773 return err; 1774 } 1775 1776 static int snd_timer_user_status(struct file *file, 1777 struct snd_timer_status __user *_status) 1778 { 1779 struct snd_timer_user *tu; 1780 struct snd_timer_status status; 1781 1782 tu = file->private_data; 1783 if (!tu->timeri) 1784 return -EBADFD; 1785 memset(&status, 0, sizeof(status)); 1786 status.tstamp = tu->tstamp; 1787 status.resolution = snd_timer_resolution(tu->timeri); 1788 status.lost = tu->timeri->lost; 1789 status.overrun = tu->overrun; 1790 spin_lock_irq(&tu->qlock); 1791 status.queue = tu->qused; 1792 spin_unlock_irq(&tu->qlock); 1793 if (copy_to_user(_status, &status, sizeof(status))) 1794 return -EFAULT; 1795 return 0; 1796 } 1797 1798 static int snd_timer_user_start(struct file *file) 1799 { 1800 int err; 1801 struct snd_timer_user *tu; 1802 1803 tu = file->private_data; 1804 if (!tu->timeri) 1805 return -EBADFD; 1806 snd_timer_stop(tu->timeri); 1807 tu->timeri->lost = 0; 1808 tu->last_resolution = 0; 1809 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1810 } 1811 1812 static int snd_timer_user_stop(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 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1821 } 1822 1823 static int snd_timer_user_continue(struct file *file) 1824 { 1825 int err; 1826 struct snd_timer_user *tu; 1827 1828 tu = file->private_data; 1829 if (!tu->timeri) 1830 return -EBADFD; 1831 tu->timeri->lost = 0; 1832 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1833 } 1834 1835 static int snd_timer_user_pause(struct file *file) 1836 { 1837 int err; 1838 struct snd_timer_user *tu; 1839 1840 tu = file->private_data; 1841 if (!tu->timeri) 1842 return -EBADFD; 1843 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1844 } 1845 1846 enum { 1847 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1848 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1849 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1850 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1851 }; 1852 1853 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1854 unsigned long arg) 1855 { 1856 struct snd_timer_user *tu; 1857 void __user *argp = (void __user *)arg; 1858 int __user *p = argp; 1859 1860 tu = file->private_data; 1861 switch (cmd) { 1862 case SNDRV_TIMER_IOCTL_PVERSION: 1863 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1864 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1865 return snd_timer_user_next_device(argp); 1866 case SNDRV_TIMER_IOCTL_TREAD: 1867 { 1868 int xarg; 1869 1870 if (tu->timeri) /* too late */ 1871 return -EBUSY; 1872 if (get_user(xarg, p)) 1873 return -EFAULT; 1874 tu->tread = xarg ? 1 : 0; 1875 return 0; 1876 } 1877 case SNDRV_TIMER_IOCTL_GINFO: 1878 return snd_timer_user_ginfo(file, argp); 1879 case SNDRV_TIMER_IOCTL_GPARAMS: 1880 return snd_timer_user_gparams(file, argp); 1881 case SNDRV_TIMER_IOCTL_GSTATUS: 1882 return snd_timer_user_gstatus(file, argp); 1883 case SNDRV_TIMER_IOCTL_SELECT: 1884 return snd_timer_user_tselect(file, argp); 1885 case SNDRV_TIMER_IOCTL_INFO: 1886 return snd_timer_user_info(file, argp); 1887 case SNDRV_TIMER_IOCTL_PARAMS: 1888 return snd_timer_user_params(file, argp); 1889 case SNDRV_TIMER_IOCTL_STATUS: 1890 return snd_timer_user_status(file, argp); 1891 case SNDRV_TIMER_IOCTL_START: 1892 case SNDRV_TIMER_IOCTL_START_OLD: 1893 return snd_timer_user_start(file); 1894 case SNDRV_TIMER_IOCTL_STOP: 1895 case SNDRV_TIMER_IOCTL_STOP_OLD: 1896 return snd_timer_user_stop(file); 1897 case SNDRV_TIMER_IOCTL_CONTINUE: 1898 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1899 return snd_timer_user_continue(file); 1900 case SNDRV_TIMER_IOCTL_PAUSE: 1901 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1902 return snd_timer_user_pause(file); 1903 } 1904 return -ENOTTY; 1905 } 1906 1907 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1908 unsigned long arg) 1909 { 1910 struct snd_timer_user *tu = file->private_data; 1911 long ret; 1912 1913 mutex_lock(&tu->ioctl_lock); 1914 ret = __snd_timer_user_ioctl(file, cmd, arg); 1915 mutex_unlock(&tu->ioctl_lock); 1916 return ret; 1917 } 1918 1919 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1920 { 1921 struct snd_timer_user *tu; 1922 1923 tu = file->private_data; 1924 return fasync_helper(fd, file, on, &tu->fasync); 1925 } 1926 1927 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1928 size_t count, loff_t *offset) 1929 { 1930 struct snd_timer_user *tu; 1931 long result = 0, unit; 1932 int err = 0; 1933 1934 tu = file->private_data; 1935 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1936 spin_lock_irq(&tu->qlock); 1937 while ((long)count - result >= unit) { 1938 while (!tu->qused) { 1939 wait_queue_t wait; 1940 1941 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1942 err = -EAGAIN; 1943 break; 1944 } 1945 1946 set_current_state(TASK_INTERRUPTIBLE); 1947 init_waitqueue_entry(&wait, current); 1948 add_wait_queue(&tu->qchange_sleep, &wait); 1949 1950 spin_unlock_irq(&tu->qlock); 1951 schedule(); 1952 spin_lock_irq(&tu->qlock); 1953 1954 remove_wait_queue(&tu->qchange_sleep, &wait); 1955 1956 if (tu->disconnected) { 1957 err = -ENODEV; 1958 break; 1959 } 1960 if (signal_pending(current)) { 1961 err = -ERESTARTSYS; 1962 break; 1963 } 1964 } 1965 1966 spin_unlock_irq(&tu->qlock); 1967 if (err < 0) 1968 goto _error; 1969 1970 if (tu->tread) { 1971 if (copy_to_user(buffer, &tu->tqueue[tu->qhead++], 1972 sizeof(struct snd_timer_tread))) { 1973 err = -EFAULT; 1974 goto _error; 1975 } 1976 } else { 1977 if (copy_to_user(buffer, &tu->queue[tu->qhead++], 1978 sizeof(struct snd_timer_read))) { 1979 err = -EFAULT; 1980 goto _error; 1981 } 1982 } 1983 1984 tu->qhead %= tu->queue_size; 1985 1986 result += unit; 1987 buffer += unit; 1988 1989 spin_lock_irq(&tu->qlock); 1990 tu->qused--; 1991 } 1992 spin_unlock_irq(&tu->qlock); 1993 _error: 1994 return result > 0 ? result : err; 1995 } 1996 1997 static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait) 1998 { 1999 unsigned int mask; 2000 struct snd_timer_user *tu; 2001 2002 tu = file->private_data; 2003 2004 poll_wait(file, &tu->qchange_sleep, wait); 2005 2006 mask = 0; 2007 if (tu->qused) 2008 mask |= POLLIN | POLLRDNORM; 2009 if (tu->disconnected) 2010 mask |= POLLERR; 2011 2012 return mask; 2013 } 2014 2015 #ifdef CONFIG_COMPAT 2016 #include "timer_compat.c" 2017 #else 2018 #define snd_timer_user_ioctl_compat NULL 2019 #endif 2020 2021 static const struct file_operations snd_timer_f_ops = 2022 { 2023 .owner = THIS_MODULE, 2024 .read = snd_timer_user_read, 2025 .open = snd_timer_user_open, 2026 .release = snd_timer_user_release, 2027 .llseek = no_llseek, 2028 .poll = snd_timer_user_poll, 2029 .unlocked_ioctl = snd_timer_user_ioctl, 2030 .compat_ioctl = snd_timer_user_ioctl_compat, 2031 .fasync = snd_timer_user_fasync, 2032 }; 2033 2034 /* unregister the system timer */ 2035 static void snd_timer_free_all(void) 2036 { 2037 struct snd_timer *timer, *n; 2038 2039 list_for_each_entry_safe(timer, n, &snd_timer_list, device_list) 2040 snd_timer_free(timer); 2041 } 2042 2043 static struct device timer_dev; 2044 2045 /* 2046 * ENTRY functions 2047 */ 2048 2049 static int __init alsa_timer_init(void) 2050 { 2051 int err; 2052 2053 snd_device_initialize(&timer_dev, NULL); 2054 dev_set_name(&timer_dev, "timer"); 2055 2056 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2057 snd_oss_info_register(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1, 2058 "system timer"); 2059 #endif 2060 2061 err = snd_timer_register_system(); 2062 if (err < 0) { 2063 pr_err("ALSA: unable to register system timer (%i)\n", err); 2064 put_device(&timer_dev); 2065 return err; 2066 } 2067 2068 err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0, 2069 &snd_timer_f_ops, NULL, &timer_dev); 2070 if (err < 0) { 2071 pr_err("ALSA: unable to register timer device (%i)\n", err); 2072 snd_timer_free_all(); 2073 put_device(&timer_dev); 2074 return err; 2075 } 2076 2077 snd_timer_proc_init(); 2078 return 0; 2079 } 2080 2081 static void __exit alsa_timer_exit(void) 2082 { 2083 snd_unregister_device(&timer_dev); 2084 snd_timer_free_all(); 2085 put_device(&timer_dev); 2086 snd_timer_proc_done(); 2087 #ifdef SNDRV_OSS_INFO_DEV_TIMERS 2088 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_TIMERS, SNDRV_CARDS - 1); 2089 #endif 2090 } 2091 2092 module_init(alsa_timer_init) 2093 module_exit(alsa_timer_exit) 2094 2095 EXPORT_SYMBOL(snd_timer_open); 2096 EXPORT_SYMBOL(snd_timer_close); 2097 EXPORT_SYMBOL(snd_timer_resolution); 2098 EXPORT_SYMBOL(snd_timer_start); 2099 EXPORT_SYMBOL(snd_timer_stop); 2100 EXPORT_SYMBOL(snd_timer_continue); 2101 EXPORT_SYMBOL(snd_timer_pause); 2102 EXPORT_SYMBOL(snd_timer_new); 2103 EXPORT_SYMBOL(snd_timer_notify); 2104 EXPORT_SYMBOL(snd_timer_global_new); 2105 EXPORT_SYMBOL(snd_timer_global_free); 2106 EXPORT_SYMBOL(snd_timer_global_register); 2107 EXPORT_SYMBOL(snd_timer_interrupt); 2108