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(ts, 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 if (timeri->timer) 522 spin_lock(&timeri->timer->lock); 523 timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 524 list_del_init(&timeri->ack_list); 525 list_del_init(&timeri->active_list); 526 if (timeri->timer) 527 spin_unlock(&timeri->timer->lock); 528 spin_unlock_irqrestore(&slave_active_lock, flags); 529 goto __end; 530 } 531 timer = timeri->timer; 532 if (!timer) 533 return -EINVAL; 534 spin_lock_irqsave(&timer->lock, flags); 535 if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING | 536 SNDRV_TIMER_IFLG_START))) { 537 spin_unlock_irqrestore(&timer->lock, flags); 538 return -EBUSY; 539 } 540 list_del_init(&timeri->ack_list); 541 list_del_init(&timeri->active_list); 542 if (timer->card && timer->card->shutdown) { 543 spin_unlock_irqrestore(&timer->lock, flags); 544 return 0; 545 } 546 if ((timeri->flags & SNDRV_TIMER_IFLG_RUNNING) && 547 !(--timer->running)) { 548 timer->hw.stop(timer); 549 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) { 550 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 551 snd_timer_reschedule(timer, 0); 552 if (timer->flags & SNDRV_TIMER_FLG_CHANGE) { 553 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 554 timer->hw.start(timer); 555 } 556 } 557 } 558 timeri->flags &= ~(SNDRV_TIMER_IFLG_RUNNING | SNDRV_TIMER_IFLG_START); 559 spin_unlock_irqrestore(&timer->lock, flags); 560 __end: 561 if (event != SNDRV_TIMER_EVENT_RESOLUTION) 562 snd_timer_notify1(timeri, event); 563 return 0; 564 } 565 566 /* 567 * stop the timer instance. 568 * 569 * do not call this from the timer callback! 570 */ 571 int snd_timer_stop(struct snd_timer_instance *timeri) 572 { 573 struct snd_timer *timer; 574 unsigned long flags; 575 int err; 576 577 err = _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_STOP); 578 if (err < 0) 579 return err; 580 timer = timeri->timer; 581 if (!timer) 582 return -EINVAL; 583 spin_lock_irqsave(&timer->lock, flags); 584 timeri->cticks = timeri->ticks; 585 timeri->pticks = 0; 586 spin_unlock_irqrestore(&timer->lock, flags); 587 return 0; 588 } 589 590 /* 591 * start again.. the tick is kept. 592 */ 593 int snd_timer_continue(struct snd_timer_instance *timeri) 594 { 595 struct snd_timer *timer; 596 int result = -EINVAL; 597 unsigned long flags; 598 599 if (timeri == NULL) 600 return result; 601 if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) 602 return snd_timer_start_slave(timeri); 603 timer = timeri->timer; 604 if (! timer) 605 return -EINVAL; 606 if (timer->card && timer->card->shutdown) 607 return -ENODEV; 608 spin_lock_irqsave(&timer->lock, flags); 609 if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) { 610 result = -EBUSY; 611 goto unlock; 612 } 613 if (!timeri->cticks) 614 timeri->cticks = 1; 615 timeri->pticks = 0; 616 result = snd_timer_start1(timer, timeri, timer->sticks); 617 unlock: 618 spin_unlock_irqrestore(&timer->lock, flags); 619 snd_timer_notify1(timeri, SNDRV_TIMER_EVENT_CONTINUE); 620 return result; 621 } 622 623 /* 624 * pause.. remember the ticks left 625 */ 626 int snd_timer_pause(struct snd_timer_instance * timeri) 627 { 628 return _snd_timer_stop(timeri, SNDRV_TIMER_EVENT_PAUSE); 629 } 630 631 /* 632 * reschedule the timer 633 * 634 * start pending instances and check the scheduling ticks. 635 * when the scheduling ticks is changed set CHANGE flag to reprogram the timer. 636 */ 637 static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_left) 638 { 639 struct snd_timer_instance *ti; 640 unsigned long ticks = ~0UL; 641 642 list_for_each_entry(ti, &timer->active_list_head, active_list) { 643 if (ti->flags & SNDRV_TIMER_IFLG_START) { 644 ti->flags &= ~SNDRV_TIMER_IFLG_START; 645 ti->flags |= SNDRV_TIMER_IFLG_RUNNING; 646 timer->running++; 647 } 648 if (ti->flags & SNDRV_TIMER_IFLG_RUNNING) { 649 if (ticks > ti->cticks) 650 ticks = ti->cticks; 651 } 652 } 653 if (ticks == ~0UL) { 654 timer->flags &= ~SNDRV_TIMER_FLG_RESCHED; 655 return; 656 } 657 if (ticks > timer->hw.ticks) 658 ticks = timer->hw.ticks; 659 if (ticks_left != ticks) 660 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 661 timer->sticks = ticks; 662 } 663 664 /* 665 * timer tasklet 666 * 667 */ 668 static void snd_timer_tasklet(unsigned long arg) 669 { 670 struct snd_timer *timer = (struct snd_timer *) arg; 671 struct snd_timer_instance *ti; 672 struct list_head *p; 673 unsigned long resolution, ticks; 674 unsigned long flags; 675 676 if (timer->card && timer->card->shutdown) 677 return; 678 679 spin_lock_irqsave(&timer->lock, flags); 680 /* now process all callbacks */ 681 while (!list_empty(&timer->sack_list_head)) { 682 p = timer->sack_list_head.next; /* get first item */ 683 ti = list_entry(p, struct snd_timer_instance, ack_list); 684 685 /* remove from ack_list and make empty */ 686 list_del_init(p); 687 688 ticks = ti->pticks; 689 ti->pticks = 0; 690 resolution = ti->resolution; 691 692 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 693 spin_unlock(&timer->lock); 694 if (ti->callback) 695 ti->callback(ti, resolution, ticks); 696 spin_lock(&timer->lock); 697 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 698 } 699 spin_unlock_irqrestore(&timer->lock, flags); 700 } 701 702 /* 703 * timer interrupt 704 * 705 * ticks_left is usually equal to timer->sticks. 706 * 707 */ 708 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left) 709 { 710 struct snd_timer_instance *ti, *ts, *tmp; 711 unsigned long resolution, ticks; 712 struct list_head *p, *ack_list_head; 713 unsigned long flags; 714 int use_tasklet = 0; 715 716 if (timer == NULL) 717 return; 718 719 if (timer->card && timer->card->shutdown) 720 return; 721 722 spin_lock_irqsave(&timer->lock, flags); 723 724 /* remember the current resolution */ 725 if (timer->hw.c_resolution) 726 resolution = timer->hw.c_resolution(timer); 727 else 728 resolution = timer->hw.resolution; 729 730 /* loop for all active instances 731 * Here we cannot use list_for_each_entry because the active_list of a 732 * processed instance is relinked to done_list_head before the callback 733 * is called. 734 */ 735 list_for_each_entry_safe(ti, tmp, &timer->active_list_head, 736 active_list) { 737 if (!(ti->flags & SNDRV_TIMER_IFLG_RUNNING)) 738 continue; 739 ti->pticks += ticks_left; 740 ti->resolution = resolution; 741 if (ti->cticks < ticks_left) 742 ti->cticks = 0; 743 else 744 ti->cticks -= ticks_left; 745 if (ti->cticks) /* not expired */ 746 continue; 747 if (ti->flags & SNDRV_TIMER_IFLG_AUTO) { 748 ti->cticks = ti->ticks; 749 } else { 750 ti->flags &= ~SNDRV_TIMER_IFLG_RUNNING; 751 --timer->running; 752 list_del_init(&ti->active_list); 753 } 754 if ((timer->hw.flags & SNDRV_TIMER_HW_TASKLET) || 755 (ti->flags & SNDRV_TIMER_IFLG_FAST)) 756 ack_list_head = &timer->ack_list_head; 757 else 758 ack_list_head = &timer->sack_list_head; 759 if (list_empty(&ti->ack_list)) 760 list_add_tail(&ti->ack_list, ack_list_head); 761 list_for_each_entry(ts, &ti->slave_active_head, active_list) { 762 ts->pticks = ti->pticks; 763 ts->resolution = resolution; 764 if (list_empty(&ts->ack_list)) 765 list_add_tail(&ts->ack_list, ack_list_head); 766 } 767 } 768 if (timer->flags & SNDRV_TIMER_FLG_RESCHED) 769 snd_timer_reschedule(timer, timer->sticks); 770 if (timer->running) { 771 if (timer->hw.flags & SNDRV_TIMER_HW_STOP) { 772 timer->hw.stop(timer); 773 timer->flags |= SNDRV_TIMER_FLG_CHANGE; 774 } 775 if (!(timer->hw.flags & SNDRV_TIMER_HW_AUTO) || 776 (timer->flags & SNDRV_TIMER_FLG_CHANGE)) { 777 /* restart timer */ 778 timer->flags &= ~SNDRV_TIMER_FLG_CHANGE; 779 timer->hw.start(timer); 780 } 781 } else { 782 timer->hw.stop(timer); 783 } 784 785 /* now process all fast callbacks */ 786 while (!list_empty(&timer->ack_list_head)) { 787 p = timer->ack_list_head.next; /* get first item */ 788 ti = list_entry(p, struct snd_timer_instance, ack_list); 789 790 /* remove from ack_list and make empty */ 791 list_del_init(p); 792 793 ticks = ti->pticks; 794 ti->pticks = 0; 795 796 ti->flags |= SNDRV_TIMER_IFLG_CALLBACK; 797 spin_unlock(&timer->lock); 798 if (ti->callback) 799 ti->callback(ti, resolution, ticks); 800 spin_lock(&timer->lock); 801 ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK; 802 } 803 804 /* do we have any slow callbacks? */ 805 use_tasklet = !list_empty(&timer->sack_list_head); 806 spin_unlock_irqrestore(&timer->lock, flags); 807 808 if (use_tasklet) 809 tasklet_schedule(&timer->task_queue); 810 } 811 812 /* 813 814 */ 815 816 int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, 817 struct snd_timer **rtimer) 818 { 819 struct snd_timer *timer; 820 int err; 821 static struct snd_device_ops ops = { 822 .dev_free = snd_timer_dev_free, 823 .dev_register = snd_timer_dev_register, 824 .dev_disconnect = snd_timer_dev_disconnect, 825 }; 826 827 if (snd_BUG_ON(!tid)) 828 return -EINVAL; 829 if (rtimer) 830 *rtimer = NULL; 831 timer = kzalloc(sizeof(*timer), GFP_KERNEL); 832 if (!timer) 833 return -ENOMEM; 834 timer->tmr_class = tid->dev_class; 835 timer->card = card; 836 timer->tmr_device = tid->device; 837 timer->tmr_subdevice = tid->subdevice; 838 if (id) 839 strlcpy(timer->id, id, sizeof(timer->id)); 840 INIT_LIST_HEAD(&timer->device_list); 841 INIT_LIST_HEAD(&timer->open_list_head); 842 INIT_LIST_HEAD(&timer->active_list_head); 843 INIT_LIST_HEAD(&timer->ack_list_head); 844 INIT_LIST_HEAD(&timer->sack_list_head); 845 spin_lock_init(&timer->lock); 846 tasklet_init(&timer->task_queue, snd_timer_tasklet, 847 (unsigned long)timer); 848 if (card != NULL) { 849 timer->module = card->module; 850 err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops); 851 if (err < 0) { 852 snd_timer_free(timer); 853 return err; 854 } 855 } 856 if (rtimer) 857 *rtimer = timer; 858 return 0; 859 } 860 861 static int snd_timer_free(struct snd_timer *timer) 862 { 863 if (!timer) 864 return 0; 865 866 mutex_lock(®ister_mutex); 867 if (! list_empty(&timer->open_list_head)) { 868 struct list_head *p, *n; 869 struct snd_timer_instance *ti; 870 pr_warn("ALSA: timer %p is busy?\n", timer); 871 list_for_each_safe(p, n, &timer->open_list_head) { 872 list_del_init(p); 873 ti = list_entry(p, struct snd_timer_instance, open_list); 874 ti->timer = NULL; 875 } 876 } 877 list_del(&timer->device_list); 878 mutex_unlock(®ister_mutex); 879 880 if (timer->private_free) 881 timer->private_free(timer); 882 kfree(timer); 883 return 0; 884 } 885 886 static int snd_timer_dev_free(struct snd_device *device) 887 { 888 struct snd_timer *timer = device->device_data; 889 return snd_timer_free(timer); 890 } 891 892 static int snd_timer_dev_register(struct snd_device *dev) 893 { 894 struct snd_timer *timer = dev->device_data; 895 struct snd_timer *timer1; 896 897 if (snd_BUG_ON(!timer || !timer->hw.start || !timer->hw.stop)) 898 return -ENXIO; 899 if (!(timer->hw.flags & SNDRV_TIMER_HW_SLAVE) && 900 !timer->hw.resolution && timer->hw.c_resolution == NULL) 901 return -EINVAL; 902 903 mutex_lock(®ister_mutex); 904 list_for_each_entry(timer1, &snd_timer_list, device_list) { 905 if (timer1->tmr_class > timer->tmr_class) 906 break; 907 if (timer1->tmr_class < timer->tmr_class) 908 continue; 909 if (timer1->card && timer->card) { 910 if (timer1->card->number > timer->card->number) 911 break; 912 if (timer1->card->number < timer->card->number) 913 continue; 914 } 915 if (timer1->tmr_device > timer->tmr_device) 916 break; 917 if (timer1->tmr_device < timer->tmr_device) 918 continue; 919 if (timer1->tmr_subdevice > timer->tmr_subdevice) 920 break; 921 if (timer1->tmr_subdevice < timer->tmr_subdevice) 922 continue; 923 /* conflicts.. */ 924 mutex_unlock(®ister_mutex); 925 return -EBUSY; 926 } 927 list_add_tail(&timer->device_list, &timer1->device_list); 928 mutex_unlock(®ister_mutex); 929 return 0; 930 } 931 932 static int snd_timer_dev_disconnect(struct snd_device *device) 933 { 934 struct snd_timer *timer = device->device_data; 935 struct snd_timer_instance *ti; 936 937 mutex_lock(®ister_mutex); 938 list_del_init(&timer->device_list); 939 /* wake up pending sleepers */ 940 list_for_each_entry(ti, &timer->open_list_head, open_list) { 941 if (ti->disconnect) 942 ti->disconnect(ti); 943 } 944 mutex_unlock(®ister_mutex); 945 return 0; 946 } 947 948 void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) 949 { 950 unsigned long flags; 951 unsigned long resolution = 0; 952 struct snd_timer_instance *ti, *ts; 953 954 if (timer->card && timer->card->shutdown) 955 return; 956 if (! (timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) 957 return; 958 if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART || 959 event > SNDRV_TIMER_EVENT_MRESUME)) 960 return; 961 spin_lock_irqsave(&timer->lock, flags); 962 if (event == SNDRV_TIMER_EVENT_MSTART || 963 event == SNDRV_TIMER_EVENT_MCONTINUE || 964 event == SNDRV_TIMER_EVENT_MRESUME) { 965 if (timer->hw.c_resolution) 966 resolution = timer->hw.c_resolution(timer); 967 else 968 resolution = timer->hw.resolution; 969 } 970 list_for_each_entry(ti, &timer->active_list_head, active_list) { 971 if (ti->ccallback) 972 ti->ccallback(ti, event, tstamp, resolution); 973 list_for_each_entry(ts, &ti->slave_active_head, active_list) 974 if (ts->ccallback) 975 ts->ccallback(ts, event, tstamp, resolution); 976 } 977 spin_unlock_irqrestore(&timer->lock, flags); 978 } 979 980 /* 981 * exported functions for global timers 982 */ 983 int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer) 984 { 985 struct snd_timer_id tid; 986 987 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL; 988 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; 989 tid.card = -1; 990 tid.device = device; 991 tid.subdevice = 0; 992 return snd_timer_new(NULL, id, &tid, rtimer); 993 } 994 995 int snd_timer_global_free(struct snd_timer *timer) 996 { 997 return snd_timer_free(timer); 998 } 999 1000 int snd_timer_global_register(struct snd_timer *timer) 1001 { 1002 struct snd_device dev; 1003 1004 memset(&dev, 0, sizeof(dev)); 1005 dev.device_data = timer; 1006 return snd_timer_dev_register(&dev); 1007 } 1008 1009 /* 1010 * System timer 1011 */ 1012 1013 struct snd_timer_system_private { 1014 struct timer_list tlist; 1015 unsigned long last_expires; 1016 unsigned long last_jiffies; 1017 unsigned long correction; 1018 }; 1019 1020 static void snd_timer_s_function(unsigned long data) 1021 { 1022 struct snd_timer *timer = (struct snd_timer *)data; 1023 struct snd_timer_system_private *priv = timer->private_data; 1024 unsigned long jiff = jiffies; 1025 if (time_after(jiff, priv->last_expires)) 1026 priv->correction += (long)jiff - (long)priv->last_expires; 1027 snd_timer_interrupt(timer, (long)jiff - (long)priv->last_jiffies); 1028 } 1029 1030 static int snd_timer_s_start(struct snd_timer * timer) 1031 { 1032 struct snd_timer_system_private *priv; 1033 unsigned long njiff; 1034 1035 priv = (struct snd_timer_system_private *) timer->private_data; 1036 njiff = (priv->last_jiffies = jiffies); 1037 if (priv->correction > timer->sticks - 1) { 1038 priv->correction -= timer->sticks - 1; 1039 njiff++; 1040 } else { 1041 njiff += timer->sticks - priv->correction; 1042 priv->correction = 0; 1043 } 1044 priv->last_expires = priv->tlist.expires = njiff; 1045 add_timer(&priv->tlist); 1046 return 0; 1047 } 1048 1049 static int snd_timer_s_stop(struct snd_timer * timer) 1050 { 1051 struct snd_timer_system_private *priv; 1052 unsigned long jiff; 1053 1054 priv = (struct snd_timer_system_private *) timer->private_data; 1055 del_timer(&priv->tlist); 1056 jiff = jiffies; 1057 if (time_before(jiff, priv->last_expires)) 1058 timer->sticks = priv->last_expires - jiff; 1059 else 1060 timer->sticks = 1; 1061 priv->correction = 0; 1062 return 0; 1063 } 1064 1065 static int snd_timer_s_close(struct snd_timer *timer) 1066 { 1067 struct snd_timer_system_private *priv; 1068 1069 priv = (struct snd_timer_system_private *)timer->private_data; 1070 del_timer_sync(&priv->tlist); 1071 return 0; 1072 } 1073 1074 static struct snd_timer_hardware snd_timer_system = 1075 { 1076 .flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_TASKLET, 1077 .resolution = 1000000000L / HZ, 1078 .ticks = 10000000L, 1079 .close = snd_timer_s_close, 1080 .start = snd_timer_s_start, 1081 .stop = snd_timer_s_stop 1082 }; 1083 1084 static void snd_timer_free_system(struct snd_timer *timer) 1085 { 1086 kfree(timer->private_data); 1087 } 1088 1089 static int snd_timer_register_system(void) 1090 { 1091 struct snd_timer *timer; 1092 struct snd_timer_system_private *priv; 1093 int err; 1094 1095 err = snd_timer_global_new("system", SNDRV_TIMER_GLOBAL_SYSTEM, &timer); 1096 if (err < 0) 1097 return err; 1098 strcpy(timer->name, "system timer"); 1099 timer->hw = snd_timer_system; 1100 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1101 if (priv == NULL) { 1102 snd_timer_free(timer); 1103 return -ENOMEM; 1104 } 1105 setup_timer(&priv->tlist, snd_timer_s_function, (unsigned long) timer); 1106 timer->private_data = priv; 1107 timer->private_free = snd_timer_free_system; 1108 return snd_timer_global_register(timer); 1109 } 1110 1111 #ifdef CONFIG_SND_PROC_FS 1112 /* 1113 * Info interface 1114 */ 1115 1116 static void snd_timer_proc_read(struct snd_info_entry *entry, 1117 struct snd_info_buffer *buffer) 1118 { 1119 struct snd_timer *timer; 1120 struct snd_timer_instance *ti; 1121 1122 mutex_lock(®ister_mutex); 1123 list_for_each_entry(timer, &snd_timer_list, device_list) { 1124 if (timer->card && timer->card->shutdown) 1125 continue; 1126 switch (timer->tmr_class) { 1127 case SNDRV_TIMER_CLASS_GLOBAL: 1128 snd_iprintf(buffer, "G%i: ", timer->tmr_device); 1129 break; 1130 case SNDRV_TIMER_CLASS_CARD: 1131 snd_iprintf(buffer, "C%i-%i: ", 1132 timer->card->number, timer->tmr_device); 1133 break; 1134 case SNDRV_TIMER_CLASS_PCM: 1135 snd_iprintf(buffer, "P%i-%i-%i: ", timer->card->number, 1136 timer->tmr_device, timer->tmr_subdevice); 1137 break; 1138 default: 1139 snd_iprintf(buffer, "?%i-%i-%i-%i: ", timer->tmr_class, 1140 timer->card ? timer->card->number : -1, 1141 timer->tmr_device, timer->tmr_subdevice); 1142 } 1143 snd_iprintf(buffer, "%s :", timer->name); 1144 if (timer->hw.resolution) 1145 snd_iprintf(buffer, " %lu.%03luus (%lu ticks)", 1146 timer->hw.resolution / 1000, 1147 timer->hw.resolution % 1000, 1148 timer->hw.ticks); 1149 if (timer->hw.flags & SNDRV_TIMER_HW_SLAVE) 1150 snd_iprintf(buffer, " SLAVE"); 1151 snd_iprintf(buffer, "\n"); 1152 list_for_each_entry(ti, &timer->open_list_head, open_list) 1153 snd_iprintf(buffer, " Client %s : %s\n", 1154 ti->owner ? ti->owner : "unknown", 1155 ti->flags & (SNDRV_TIMER_IFLG_START | 1156 SNDRV_TIMER_IFLG_RUNNING) 1157 ? "running" : "stopped"); 1158 } 1159 mutex_unlock(®ister_mutex); 1160 } 1161 1162 static struct snd_info_entry *snd_timer_proc_entry; 1163 1164 static void __init snd_timer_proc_init(void) 1165 { 1166 struct snd_info_entry *entry; 1167 1168 entry = snd_info_create_module_entry(THIS_MODULE, "timers", NULL); 1169 if (entry != NULL) { 1170 entry->c.text.read = snd_timer_proc_read; 1171 if (snd_info_register(entry) < 0) { 1172 snd_info_free_entry(entry); 1173 entry = NULL; 1174 } 1175 } 1176 snd_timer_proc_entry = entry; 1177 } 1178 1179 static void __exit snd_timer_proc_done(void) 1180 { 1181 snd_info_free_entry(snd_timer_proc_entry); 1182 } 1183 #else /* !CONFIG_SND_PROC_FS */ 1184 #define snd_timer_proc_init() 1185 #define snd_timer_proc_done() 1186 #endif 1187 1188 /* 1189 * USER SPACE interface 1190 */ 1191 1192 static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, 1193 unsigned long resolution, 1194 unsigned long ticks) 1195 { 1196 struct snd_timer_user *tu = timeri->callback_data; 1197 struct snd_timer_read *r; 1198 int prev; 1199 1200 spin_lock(&tu->qlock); 1201 if (tu->qused > 0) { 1202 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1203 r = &tu->queue[prev]; 1204 if (r->resolution == resolution) { 1205 r->ticks += ticks; 1206 goto __wake; 1207 } 1208 } 1209 if (tu->qused >= tu->queue_size) { 1210 tu->overrun++; 1211 } else { 1212 r = &tu->queue[tu->qtail++]; 1213 tu->qtail %= tu->queue_size; 1214 r->resolution = resolution; 1215 r->ticks = ticks; 1216 tu->qused++; 1217 } 1218 __wake: 1219 spin_unlock(&tu->qlock); 1220 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1221 wake_up(&tu->qchange_sleep); 1222 } 1223 1224 static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, 1225 struct snd_timer_tread *tread) 1226 { 1227 if (tu->qused >= tu->queue_size) { 1228 tu->overrun++; 1229 } else { 1230 memcpy(&tu->tqueue[tu->qtail++], tread, sizeof(*tread)); 1231 tu->qtail %= tu->queue_size; 1232 tu->qused++; 1233 } 1234 } 1235 1236 static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, 1237 int event, 1238 struct timespec *tstamp, 1239 unsigned long resolution) 1240 { 1241 struct snd_timer_user *tu = timeri->callback_data; 1242 struct snd_timer_tread r1; 1243 unsigned long flags; 1244 1245 if (event >= SNDRV_TIMER_EVENT_START && 1246 event <= SNDRV_TIMER_EVENT_PAUSE) 1247 tu->tstamp = *tstamp; 1248 if ((tu->filter & (1 << event)) == 0 || !tu->tread) 1249 return; 1250 r1.event = event; 1251 r1.tstamp = *tstamp; 1252 r1.val = resolution; 1253 spin_lock_irqsave(&tu->qlock, flags); 1254 snd_timer_user_append_to_tqueue(tu, &r1); 1255 spin_unlock_irqrestore(&tu->qlock, flags); 1256 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1257 wake_up(&tu->qchange_sleep); 1258 } 1259 1260 static void snd_timer_user_disconnect(struct snd_timer_instance *timeri) 1261 { 1262 struct snd_timer_user *tu = timeri->callback_data; 1263 1264 tu->disconnected = true; 1265 wake_up(&tu->qchange_sleep); 1266 } 1267 1268 static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, 1269 unsigned long resolution, 1270 unsigned long ticks) 1271 { 1272 struct snd_timer_user *tu = timeri->callback_data; 1273 struct snd_timer_tread *r, r1; 1274 struct timespec tstamp; 1275 int prev, append = 0; 1276 1277 memset(&tstamp, 0, sizeof(tstamp)); 1278 spin_lock(&tu->qlock); 1279 if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) | 1280 (1 << SNDRV_TIMER_EVENT_TICK))) == 0) { 1281 spin_unlock(&tu->qlock); 1282 return; 1283 } 1284 if (tu->last_resolution != resolution || ticks > 0) { 1285 if (timer_tstamp_monotonic) 1286 ktime_get_ts(&tstamp); 1287 else 1288 getnstimeofday(&tstamp); 1289 } 1290 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && 1291 tu->last_resolution != resolution) { 1292 r1.event = SNDRV_TIMER_EVENT_RESOLUTION; 1293 r1.tstamp = tstamp; 1294 r1.val = resolution; 1295 snd_timer_user_append_to_tqueue(tu, &r1); 1296 tu->last_resolution = resolution; 1297 append++; 1298 } 1299 if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0) 1300 goto __wake; 1301 if (ticks == 0) 1302 goto __wake; 1303 if (tu->qused > 0) { 1304 prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; 1305 r = &tu->tqueue[prev]; 1306 if (r->event == SNDRV_TIMER_EVENT_TICK) { 1307 r->tstamp = tstamp; 1308 r->val += ticks; 1309 append++; 1310 goto __wake; 1311 } 1312 } 1313 r1.event = SNDRV_TIMER_EVENT_TICK; 1314 r1.tstamp = tstamp; 1315 r1.val = ticks; 1316 snd_timer_user_append_to_tqueue(tu, &r1); 1317 append++; 1318 __wake: 1319 spin_unlock(&tu->qlock); 1320 if (append == 0) 1321 return; 1322 kill_fasync(&tu->fasync, SIGIO, POLL_IN); 1323 wake_up(&tu->qchange_sleep); 1324 } 1325 1326 static int snd_timer_user_open(struct inode *inode, struct file *file) 1327 { 1328 struct snd_timer_user *tu; 1329 int err; 1330 1331 err = nonseekable_open(inode, file); 1332 if (err < 0) 1333 return err; 1334 1335 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 1336 if (tu == NULL) 1337 return -ENOMEM; 1338 spin_lock_init(&tu->qlock); 1339 init_waitqueue_head(&tu->qchange_sleep); 1340 mutex_init(&tu->ioctl_lock); 1341 tu->ticks = 1; 1342 tu->queue_size = 128; 1343 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1344 GFP_KERNEL); 1345 if (tu->queue == NULL) { 1346 kfree(tu); 1347 return -ENOMEM; 1348 } 1349 file->private_data = tu; 1350 return 0; 1351 } 1352 1353 static int snd_timer_user_release(struct inode *inode, struct file *file) 1354 { 1355 struct snd_timer_user *tu; 1356 1357 if (file->private_data) { 1358 tu = file->private_data; 1359 file->private_data = NULL; 1360 mutex_lock(&tu->ioctl_lock); 1361 if (tu->timeri) 1362 snd_timer_close(tu->timeri); 1363 mutex_unlock(&tu->ioctl_lock); 1364 kfree(tu->queue); 1365 kfree(tu->tqueue); 1366 kfree(tu); 1367 } 1368 return 0; 1369 } 1370 1371 static void snd_timer_user_zero_id(struct snd_timer_id *id) 1372 { 1373 id->dev_class = SNDRV_TIMER_CLASS_NONE; 1374 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1375 id->card = -1; 1376 id->device = -1; 1377 id->subdevice = -1; 1378 } 1379 1380 static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *timer) 1381 { 1382 id->dev_class = timer->tmr_class; 1383 id->dev_sclass = SNDRV_TIMER_SCLASS_NONE; 1384 id->card = timer->card ? timer->card->number : -1; 1385 id->device = timer->tmr_device; 1386 id->subdevice = timer->tmr_subdevice; 1387 } 1388 1389 static int snd_timer_user_next_device(struct snd_timer_id __user *_tid) 1390 { 1391 struct snd_timer_id id; 1392 struct snd_timer *timer; 1393 struct list_head *p; 1394 1395 if (copy_from_user(&id, _tid, sizeof(id))) 1396 return -EFAULT; 1397 mutex_lock(®ister_mutex); 1398 if (id.dev_class < 0) { /* first item */ 1399 if (list_empty(&snd_timer_list)) 1400 snd_timer_user_zero_id(&id); 1401 else { 1402 timer = list_entry(snd_timer_list.next, 1403 struct snd_timer, device_list); 1404 snd_timer_user_copy_id(&id, timer); 1405 } 1406 } else { 1407 switch (id.dev_class) { 1408 case SNDRV_TIMER_CLASS_GLOBAL: 1409 id.device = id.device < 0 ? 0 : id.device + 1; 1410 list_for_each(p, &snd_timer_list) { 1411 timer = list_entry(p, struct snd_timer, device_list); 1412 if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) { 1413 snd_timer_user_copy_id(&id, timer); 1414 break; 1415 } 1416 if (timer->tmr_device >= id.device) { 1417 snd_timer_user_copy_id(&id, timer); 1418 break; 1419 } 1420 } 1421 if (p == &snd_timer_list) 1422 snd_timer_user_zero_id(&id); 1423 break; 1424 case SNDRV_TIMER_CLASS_CARD: 1425 case SNDRV_TIMER_CLASS_PCM: 1426 if (id.card < 0) { 1427 id.card = 0; 1428 } else { 1429 if (id.card < 0) { 1430 id.card = 0; 1431 } else { 1432 if (id.device < 0) { 1433 id.device = 0; 1434 } else { 1435 if (id.subdevice < 0) { 1436 id.subdevice = 0; 1437 } else { 1438 id.subdevice++; 1439 } 1440 } 1441 } 1442 } 1443 list_for_each(p, &snd_timer_list) { 1444 timer = list_entry(p, struct snd_timer, device_list); 1445 if (timer->tmr_class > id.dev_class) { 1446 snd_timer_user_copy_id(&id, timer); 1447 break; 1448 } 1449 if (timer->tmr_class < id.dev_class) 1450 continue; 1451 if (timer->card->number > id.card) { 1452 snd_timer_user_copy_id(&id, timer); 1453 break; 1454 } 1455 if (timer->card->number < id.card) 1456 continue; 1457 if (timer->tmr_device > id.device) { 1458 snd_timer_user_copy_id(&id, timer); 1459 break; 1460 } 1461 if (timer->tmr_device < id.device) 1462 continue; 1463 if (timer->tmr_subdevice > id.subdevice) { 1464 snd_timer_user_copy_id(&id, timer); 1465 break; 1466 } 1467 if (timer->tmr_subdevice < id.subdevice) 1468 continue; 1469 snd_timer_user_copy_id(&id, timer); 1470 break; 1471 } 1472 if (p == &snd_timer_list) 1473 snd_timer_user_zero_id(&id); 1474 break; 1475 default: 1476 snd_timer_user_zero_id(&id); 1477 } 1478 } 1479 mutex_unlock(®ister_mutex); 1480 if (copy_to_user(_tid, &id, sizeof(*_tid))) 1481 return -EFAULT; 1482 return 0; 1483 } 1484 1485 static int snd_timer_user_ginfo(struct file *file, 1486 struct snd_timer_ginfo __user *_ginfo) 1487 { 1488 struct snd_timer_ginfo *ginfo; 1489 struct snd_timer_id tid; 1490 struct snd_timer *t; 1491 struct list_head *p; 1492 int err = 0; 1493 1494 ginfo = memdup_user(_ginfo, sizeof(*ginfo)); 1495 if (IS_ERR(ginfo)) 1496 return PTR_ERR(ginfo); 1497 1498 tid = ginfo->tid; 1499 memset(ginfo, 0, sizeof(*ginfo)); 1500 ginfo->tid = tid; 1501 mutex_lock(®ister_mutex); 1502 t = snd_timer_find(&tid); 1503 if (t != NULL) { 1504 ginfo->card = t->card ? t->card->number : -1; 1505 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1506 ginfo->flags |= SNDRV_TIMER_FLG_SLAVE; 1507 strlcpy(ginfo->id, t->id, sizeof(ginfo->id)); 1508 strlcpy(ginfo->name, t->name, sizeof(ginfo->name)); 1509 ginfo->resolution = t->hw.resolution; 1510 if (t->hw.resolution_min > 0) { 1511 ginfo->resolution_min = t->hw.resolution_min; 1512 ginfo->resolution_max = t->hw.resolution_max; 1513 } 1514 list_for_each(p, &t->open_list_head) { 1515 ginfo->clients++; 1516 } 1517 } else { 1518 err = -ENODEV; 1519 } 1520 mutex_unlock(®ister_mutex); 1521 if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo))) 1522 err = -EFAULT; 1523 kfree(ginfo); 1524 return err; 1525 } 1526 1527 static int snd_timer_user_gparams(struct file *file, 1528 struct snd_timer_gparams __user *_gparams) 1529 { 1530 struct snd_timer_gparams gparams; 1531 struct snd_timer *t; 1532 int err; 1533 1534 if (copy_from_user(&gparams, _gparams, sizeof(gparams))) 1535 return -EFAULT; 1536 mutex_lock(®ister_mutex); 1537 t = snd_timer_find(&gparams.tid); 1538 if (!t) { 1539 err = -ENODEV; 1540 goto _error; 1541 } 1542 if (!list_empty(&t->open_list_head)) { 1543 err = -EBUSY; 1544 goto _error; 1545 } 1546 if (!t->hw.set_period) { 1547 err = -ENOSYS; 1548 goto _error; 1549 } 1550 err = t->hw.set_period(t, gparams.period_num, gparams.period_den); 1551 _error: 1552 mutex_unlock(®ister_mutex); 1553 return err; 1554 } 1555 1556 static int snd_timer_user_gstatus(struct file *file, 1557 struct snd_timer_gstatus __user *_gstatus) 1558 { 1559 struct snd_timer_gstatus gstatus; 1560 struct snd_timer_id tid; 1561 struct snd_timer *t; 1562 int err = 0; 1563 1564 if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus))) 1565 return -EFAULT; 1566 tid = gstatus.tid; 1567 memset(&gstatus, 0, sizeof(gstatus)); 1568 gstatus.tid = tid; 1569 mutex_lock(®ister_mutex); 1570 t = snd_timer_find(&tid); 1571 if (t != NULL) { 1572 if (t->hw.c_resolution) 1573 gstatus.resolution = t->hw.c_resolution(t); 1574 else 1575 gstatus.resolution = t->hw.resolution; 1576 if (t->hw.precise_resolution) { 1577 t->hw.precise_resolution(t, &gstatus.resolution_num, 1578 &gstatus.resolution_den); 1579 } else { 1580 gstatus.resolution_num = gstatus.resolution; 1581 gstatus.resolution_den = 1000000000uL; 1582 } 1583 } else { 1584 err = -ENODEV; 1585 } 1586 mutex_unlock(®ister_mutex); 1587 if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus))) 1588 err = -EFAULT; 1589 return err; 1590 } 1591 1592 static int snd_timer_user_tselect(struct file *file, 1593 struct snd_timer_select __user *_tselect) 1594 { 1595 struct snd_timer_user *tu; 1596 struct snd_timer_select tselect; 1597 char str[32]; 1598 int err = 0; 1599 1600 tu = file->private_data; 1601 if (tu->timeri) { 1602 snd_timer_close(tu->timeri); 1603 tu->timeri = NULL; 1604 } 1605 if (copy_from_user(&tselect, _tselect, sizeof(tselect))) { 1606 err = -EFAULT; 1607 goto __err; 1608 } 1609 sprintf(str, "application %i", current->pid); 1610 if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE) 1611 tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION; 1612 err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid); 1613 if (err < 0) 1614 goto __err; 1615 1616 kfree(tu->queue); 1617 tu->queue = NULL; 1618 kfree(tu->tqueue); 1619 tu->tqueue = NULL; 1620 if (tu->tread) { 1621 tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread), 1622 GFP_KERNEL); 1623 if (tu->tqueue == NULL) 1624 err = -ENOMEM; 1625 } else { 1626 tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read), 1627 GFP_KERNEL); 1628 if (tu->queue == NULL) 1629 err = -ENOMEM; 1630 } 1631 1632 if (err < 0) { 1633 snd_timer_close(tu->timeri); 1634 tu->timeri = NULL; 1635 } else { 1636 tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST; 1637 tu->timeri->callback = tu->tread 1638 ? snd_timer_user_tinterrupt : snd_timer_user_interrupt; 1639 tu->timeri->ccallback = snd_timer_user_ccallback; 1640 tu->timeri->callback_data = (void *)tu; 1641 tu->timeri->disconnect = snd_timer_user_disconnect; 1642 } 1643 1644 __err: 1645 return err; 1646 } 1647 1648 static int snd_timer_user_info(struct file *file, 1649 struct snd_timer_info __user *_info) 1650 { 1651 struct snd_timer_user *tu; 1652 struct snd_timer_info *info; 1653 struct snd_timer *t; 1654 int err = 0; 1655 1656 tu = file->private_data; 1657 if (!tu->timeri) 1658 return -EBADFD; 1659 t = tu->timeri->timer; 1660 if (!t) 1661 return -EBADFD; 1662 1663 info = kzalloc(sizeof(*info), GFP_KERNEL); 1664 if (! info) 1665 return -ENOMEM; 1666 info->card = t->card ? t->card->number : -1; 1667 if (t->hw.flags & SNDRV_TIMER_HW_SLAVE) 1668 info->flags |= SNDRV_TIMER_FLG_SLAVE; 1669 strlcpy(info->id, t->id, sizeof(info->id)); 1670 strlcpy(info->name, t->name, sizeof(info->name)); 1671 info->resolution = t->hw.resolution; 1672 if (copy_to_user(_info, info, sizeof(*_info))) 1673 err = -EFAULT; 1674 kfree(info); 1675 return err; 1676 } 1677 1678 static int snd_timer_user_params(struct file *file, 1679 struct snd_timer_params __user *_params) 1680 { 1681 struct snd_timer_user *tu; 1682 struct snd_timer_params params; 1683 struct snd_timer *t; 1684 struct snd_timer_read *tr; 1685 struct snd_timer_tread *ttr; 1686 int err; 1687 1688 tu = file->private_data; 1689 if (!tu->timeri) 1690 return -EBADFD; 1691 t = tu->timeri->timer; 1692 if (!t) 1693 return -EBADFD; 1694 if (copy_from_user(¶ms, _params, sizeof(params))) 1695 return -EFAULT; 1696 if (!(t->hw.flags & SNDRV_TIMER_HW_SLAVE) && params.ticks < 1) { 1697 err = -EINVAL; 1698 goto _end; 1699 } 1700 if (params.queue_size > 0 && 1701 (params.queue_size < 32 || params.queue_size > 1024)) { 1702 err = -EINVAL; 1703 goto _end; 1704 } 1705 if (params.filter & ~((1<<SNDRV_TIMER_EVENT_RESOLUTION)| 1706 (1<<SNDRV_TIMER_EVENT_TICK)| 1707 (1<<SNDRV_TIMER_EVENT_START)| 1708 (1<<SNDRV_TIMER_EVENT_STOP)| 1709 (1<<SNDRV_TIMER_EVENT_CONTINUE)| 1710 (1<<SNDRV_TIMER_EVENT_PAUSE)| 1711 (1<<SNDRV_TIMER_EVENT_SUSPEND)| 1712 (1<<SNDRV_TIMER_EVENT_RESUME)| 1713 (1<<SNDRV_TIMER_EVENT_MSTART)| 1714 (1<<SNDRV_TIMER_EVENT_MSTOP)| 1715 (1<<SNDRV_TIMER_EVENT_MCONTINUE)| 1716 (1<<SNDRV_TIMER_EVENT_MPAUSE)| 1717 (1<<SNDRV_TIMER_EVENT_MSUSPEND)| 1718 (1<<SNDRV_TIMER_EVENT_MRESUME))) { 1719 err = -EINVAL; 1720 goto _end; 1721 } 1722 snd_timer_stop(tu->timeri); 1723 spin_lock_irq(&t->lock); 1724 tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO| 1725 SNDRV_TIMER_IFLG_EXCLUSIVE| 1726 SNDRV_TIMER_IFLG_EARLY_EVENT); 1727 if (params.flags & SNDRV_TIMER_PSFLG_AUTO) 1728 tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO; 1729 if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE) 1730 tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE; 1731 if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT) 1732 tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT; 1733 spin_unlock_irq(&t->lock); 1734 if (params.queue_size > 0 && 1735 (unsigned int)tu->queue_size != params.queue_size) { 1736 if (tu->tread) { 1737 ttr = kmalloc(params.queue_size * sizeof(*ttr), 1738 GFP_KERNEL); 1739 if (ttr) { 1740 kfree(tu->tqueue); 1741 tu->queue_size = params.queue_size; 1742 tu->tqueue = ttr; 1743 } 1744 } else { 1745 tr = kmalloc(params.queue_size * sizeof(*tr), 1746 GFP_KERNEL); 1747 if (tr) { 1748 kfree(tu->queue); 1749 tu->queue_size = params.queue_size; 1750 tu->queue = tr; 1751 } 1752 } 1753 } 1754 tu->qhead = tu->qtail = tu->qused = 0; 1755 if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { 1756 if (tu->tread) { 1757 struct snd_timer_tread tread; 1758 tread.event = SNDRV_TIMER_EVENT_EARLY; 1759 tread.tstamp.tv_sec = 0; 1760 tread.tstamp.tv_nsec = 0; 1761 tread.val = 0; 1762 snd_timer_user_append_to_tqueue(tu, &tread); 1763 } else { 1764 struct snd_timer_read *r = &tu->queue[0]; 1765 r->resolution = 0; 1766 r->ticks = 0; 1767 tu->qused++; 1768 tu->qtail++; 1769 } 1770 } 1771 tu->filter = params.filter; 1772 tu->ticks = params.ticks; 1773 err = 0; 1774 _end: 1775 if (copy_to_user(_params, ¶ms, sizeof(params))) 1776 return -EFAULT; 1777 return err; 1778 } 1779 1780 static int snd_timer_user_status(struct file *file, 1781 struct snd_timer_status __user *_status) 1782 { 1783 struct snd_timer_user *tu; 1784 struct snd_timer_status status; 1785 1786 tu = file->private_data; 1787 if (!tu->timeri) 1788 return -EBADFD; 1789 memset(&status, 0, sizeof(status)); 1790 status.tstamp = tu->tstamp; 1791 status.resolution = snd_timer_resolution(tu->timeri); 1792 status.lost = tu->timeri->lost; 1793 status.overrun = tu->overrun; 1794 spin_lock_irq(&tu->qlock); 1795 status.queue = tu->qused; 1796 spin_unlock_irq(&tu->qlock); 1797 if (copy_to_user(_status, &status, sizeof(status))) 1798 return -EFAULT; 1799 return 0; 1800 } 1801 1802 static int snd_timer_user_start(struct file *file) 1803 { 1804 int err; 1805 struct snd_timer_user *tu; 1806 1807 tu = file->private_data; 1808 if (!tu->timeri) 1809 return -EBADFD; 1810 snd_timer_stop(tu->timeri); 1811 tu->timeri->lost = 0; 1812 tu->last_resolution = 0; 1813 return (err = snd_timer_start(tu->timeri, tu->ticks)) < 0 ? err : 0; 1814 } 1815 1816 static int snd_timer_user_stop(struct file *file) 1817 { 1818 int err; 1819 struct snd_timer_user *tu; 1820 1821 tu = file->private_data; 1822 if (!tu->timeri) 1823 return -EBADFD; 1824 return (err = snd_timer_stop(tu->timeri)) < 0 ? err : 0; 1825 } 1826 1827 static int snd_timer_user_continue(struct file *file) 1828 { 1829 int err; 1830 struct snd_timer_user *tu; 1831 1832 tu = file->private_data; 1833 if (!tu->timeri) 1834 return -EBADFD; 1835 tu->timeri->lost = 0; 1836 return (err = snd_timer_continue(tu->timeri)) < 0 ? err : 0; 1837 } 1838 1839 static int snd_timer_user_pause(struct file *file) 1840 { 1841 int err; 1842 struct snd_timer_user *tu; 1843 1844 tu = file->private_data; 1845 if (!tu->timeri) 1846 return -EBADFD; 1847 return (err = snd_timer_pause(tu->timeri)) < 0 ? err : 0; 1848 } 1849 1850 enum { 1851 SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), 1852 SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), 1853 SNDRV_TIMER_IOCTL_CONTINUE_OLD = _IO('T', 0x22), 1854 SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23), 1855 }; 1856 1857 static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1858 unsigned long arg) 1859 { 1860 struct snd_timer_user *tu; 1861 void __user *argp = (void __user *)arg; 1862 int __user *p = argp; 1863 1864 tu = file->private_data; 1865 switch (cmd) { 1866 case SNDRV_TIMER_IOCTL_PVERSION: 1867 return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; 1868 case SNDRV_TIMER_IOCTL_NEXT_DEVICE: 1869 return snd_timer_user_next_device(argp); 1870 case SNDRV_TIMER_IOCTL_TREAD: 1871 { 1872 int xarg; 1873 1874 if (tu->timeri) /* too late */ 1875 return -EBUSY; 1876 if (get_user(xarg, p)) 1877 return -EFAULT; 1878 tu->tread = xarg ? 1 : 0; 1879 return 0; 1880 } 1881 case SNDRV_TIMER_IOCTL_GINFO: 1882 return snd_timer_user_ginfo(file, argp); 1883 case SNDRV_TIMER_IOCTL_GPARAMS: 1884 return snd_timer_user_gparams(file, argp); 1885 case SNDRV_TIMER_IOCTL_GSTATUS: 1886 return snd_timer_user_gstatus(file, argp); 1887 case SNDRV_TIMER_IOCTL_SELECT: 1888 return snd_timer_user_tselect(file, argp); 1889 case SNDRV_TIMER_IOCTL_INFO: 1890 return snd_timer_user_info(file, argp); 1891 case SNDRV_TIMER_IOCTL_PARAMS: 1892 return snd_timer_user_params(file, argp); 1893 case SNDRV_TIMER_IOCTL_STATUS: 1894 return snd_timer_user_status(file, argp); 1895 case SNDRV_TIMER_IOCTL_START: 1896 case SNDRV_TIMER_IOCTL_START_OLD: 1897 return snd_timer_user_start(file); 1898 case SNDRV_TIMER_IOCTL_STOP: 1899 case SNDRV_TIMER_IOCTL_STOP_OLD: 1900 return snd_timer_user_stop(file); 1901 case SNDRV_TIMER_IOCTL_CONTINUE: 1902 case SNDRV_TIMER_IOCTL_CONTINUE_OLD: 1903 return snd_timer_user_continue(file); 1904 case SNDRV_TIMER_IOCTL_PAUSE: 1905 case SNDRV_TIMER_IOCTL_PAUSE_OLD: 1906 return snd_timer_user_pause(file); 1907 } 1908 return -ENOTTY; 1909 } 1910 1911 static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, 1912 unsigned long arg) 1913 { 1914 struct snd_timer_user *tu = file->private_data; 1915 long ret; 1916 1917 mutex_lock(&tu->ioctl_lock); 1918 ret = __snd_timer_user_ioctl(file, cmd, arg); 1919 mutex_unlock(&tu->ioctl_lock); 1920 return ret; 1921 } 1922 1923 static int snd_timer_user_fasync(int fd, struct file * file, int on) 1924 { 1925 struct snd_timer_user *tu; 1926 1927 tu = file->private_data; 1928 return fasync_helper(fd, file, on, &tu->fasync); 1929 } 1930 1931 static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, 1932 size_t count, loff_t *offset) 1933 { 1934 struct snd_timer_user *tu; 1935 long result = 0, unit; 1936 int qhead; 1937 int err = 0; 1938 1939 tu = file->private_data; 1940 unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); 1941 spin_lock_irq(&tu->qlock); 1942 while ((long)count - result >= unit) { 1943 while (!tu->qused) { 1944 wait_queue_t wait; 1945 1946 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { 1947 err = -EAGAIN; 1948 goto _error; 1949 } 1950 1951 set_current_state(TASK_INTERRUPTIBLE); 1952 init_waitqueue_entry(&wait, current); 1953 add_wait_queue(&tu->qchange_sleep, &wait); 1954 1955 spin_unlock_irq(&tu->qlock); 1956 schedule(); 1957 spin_lock_irq(&tu->qlock); 1958 1959 remove_wait_queue(&tu->qchange_sleep, &wait); 1960 1961 if (tu->disconnected) { 1962 err = -ENODEV; 1963 goto _error; 1964 } 1965 if (signal_pending(current)) { 1966 err = -ERESTARTSYS; 1967 goto _error; 1968 } 1969 } 1970 1971 qhead = tu->qhead++; 1972 tu->qhead %= tu->queue_size; 1973 spin_unlock_irq(&tu->qlock); 1974 1975 if (tu->tread) { 1976 if (copy_to_user(buffer, &tu->tqueue[qhead], 1977 sizeof(struct snd_timer_tread))) 1978 err = -EFAULT; 1979 } else { 1980 if (copy_to_user(buffer, &tu->queue[qhead], 1981 sizeof(struct snd_timer_read))) 1982 err = -EFAULT; 1983 } 1984 1985 spin_lock_irq(&tu->qlock); 1986 tu->qused--; 1987 if (err < 0) 1988 goto _error; 1989 result += unit; 1990 buffer += unit; 1991 } 1992 _error: 1993 spin_unlock_irq(&tu->qlock); 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