1 /* drivers/rtc/alarm.c
2 *
3 * Copyright (C) 2007 Google, Inc.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include <asm/mach/time.h>
17 #include <linux/android_alarm.h>
18 #include <linux/device.h>
19 #include <linux/miscdevice.h>
20 #include <linux/platform_device.h>
21 #include <linux/rtc.h>
22 #include <linux/spinlock.h>
23 #include <linux/sysdev.h>
24 #include <linux/wakelock.h>
25
26 #define ANDROID_ALARM_PRINT_ERRORS (1U << 0)
27 #define ANDROID_ALARM_PRINT_INIT_STATUS (1U << 1)
28 #define ANDROID_ALARM_PRINT_INFO (1U << 2)
29 #define ANDROID_ALARM_PRINT_IO (1U << 3)
30 #define ANDROID_ALARM_PRINT_INT (1U << 4)
31 #define ANDROID_ALARM_PRINT_FLOW (1U << 5)
32
33 #if 0
34 #define ANDROID_ALARM_DPRINTF_MASK (~0)
35 #define ANDROID_ALARM_DPRINTF(debug_level_mask, args...) \
36 do { \
37 if (ANDROID_ALARM_DPRINTF_MASK & debug_level_mask) { \
38 printk(args); \
39 } \
40 } while (0)
41 #else
42 #define ANDROID_ALARM_DPRINTF(args...)
43 #endif
44
45 #define ANDROID_ALARM_WAKEUP_MASK ( \
46 ANDROID_ALARM_RTC_WAKEUP_MASK | \
47 ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
48
49 /* support old usespace code */
50 #define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
51 #define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
52
53 static struct rtc_device *alarm_rtc_dev;
54 static int alarm_opened;
55 static DEFINE_SPINLOCK(alarm_slock);
56 static DEFINE_MUTEX(alarm_setrtc_mutex);
57 static struct wake_lock alarm_wake_lock;
58 static struct wake_lock alarm_rtc_wake_lock;
59 static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
60 static uint32_t alarm_pending;
61 static uint32_t alarm_enabled;
62 static uint32_t wait_pending;
63 static struct platform_device *alarm_platform_dev;
64 static struct hrtimer alarm_timer[ANDROID_ALARM_TYPE_COUNT];
65 static struct timespec alarm_time[ANDROID_ALARM_TYPE_COUNT];
66 static struct timespec elapsed_rtc_delta;
67
alarm_start_hrtimer(enum android_alarm_type alarm_type)68 static void alarm_start_hrtimer(enum android_alarm_type alarm_type)
69 {
70 struct timespec hr_alarm_time;
71 if (!(alarm_enabled & (1U << alarm_type)))
72 return;
73 hr_alarm_time = alarm_time[alarm_type];
74 if (alarm_type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP ||
75 alarm_type == ANDROID_ALARM_ELAPSED_REALTIME)
76 set_normalized_timespec(&hr_alarm_time,
77 hr_alarm_time.tv_sec + elapsed_rtc_delta.tv_sec,
78 hr_alarm_time.tv_nsec + elapsed_rtc_delta.tv_nsec);
79 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_FLOW,
80 "alarm start hrtimer %d at %ld.%09ld\n",
81 alarm_type, hr_alarm_time.tv_sec, hr_alarm_time.tv_nsec);
82 hrtimer_start(&alarm_timer[alarm_type],
83 timespec_to_ktime(hr_alarm_time), HRTIMER_MODE_ABS);
84 }
85
alarm_ioctl(struct file * file,unsigned int cmd,unsigned long arg)86 static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
87 {
88 int rv = 0;
89 unsigned long flags;
90 int i;
91 struct timespec new_alarm_time;
92 struct timespec new_rtc_time;
93 struct timespec tmp_time;
94 struct rtc_time rtc_new_rtc_time;
95 enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
96 uint32_t alarm_type_mask = 1U << alarm_type;
97
98 if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
99 return -EINVAL;
100
101 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
102 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
103 return -EPERM;
104 if (file->private_data == NULL &&
105 cmd != ANDROID_ALARM_SET_RTC) {
106 spin_lock_irqsave(&alarm_slock, flags);
107 if (alarm_opened) {
108 spin_unlock_irqrestore(&alarm_slock, flags);
109 return -EBUSY;
110 }
111 alarm_opened = 1;
112 file->private_data = (void *)1;
113 spin_unlock_irqrestore(&alarm_slock, flags);
114 }
115 }
116
117 switch (ANDROID_ALARM_BASE_CMD(cmd)) {
118 case ANDROID_ALARM_CLEAR(0):
119 spin_lock_irqsave(&alarm_slock, flags);
120 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO,
121 "alarm %d clear\n", alarm_type);
122 hrtimer_try_to_cancel(&alarm_timer[alarm_type]);
123 if (alarm_pending) {
124 alarm_pending &= ~alarm_type_mask;
125 if (!alarm_pending && !wait_pending)
126 wake_unlock(&alarm_wake_lock);
127 }
128 alarm_enabled &= ~alarm_type_mask;
129 spin_unlock_irqrestore(&alarm_slock, flags);
130 break;
131
132 case ANDROID_ALARM_SET_OLD:
133 case ANDROID_ALARM_SET_AND_WAIT_OLD:
134 if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
135 rv = -EFAULT;
136 goto err1;
137 }
138 new_alarm_time.tv_nsec = 0;
139 goto from_old_alarm_set;
140
141 case ANDROID_ALARM_SET_AND_WAIT(0):
142 case ANDROID_ALARM_SET(0):
143 if (copy_from_user(&new_alarm_time, (void __user *)arg,
144 sizeof(new_alarm_time))) {
145 rv = -EFAULT;
146 goto err1;
147 }
148 from_old_alarm_set:
149 spin_lock_irqsave(&alarm_slock, flags);
150 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO,
151 "alarm %d set %ld.%09ld\n", alarm_type,
152 new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
153 alarm_time[alarm_type] = new_alarm_time;
154 alarm_enabled |= alarm_type_mask;
155 alarm_start_hrtimer(alarm_type);
156 spin_unlock_irqrestore(&alarm_slock, flags);
157 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
158 && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
159 break;
160 /* fall though */
161 case ANDROID_ALARM_WAIT:
162 spin_lock_irqsave(&alarm_slock, flags);
163 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO, "alarm wait\n");
164 if (!alarm_pending && wait_pending) {
165 wake_unlock(&alarm_wake_lock);
166 wait_pending = 0;
167 }
168 spin_unlock_irqrestore(&alarm_slock, flags);
169 rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
170 if (rv)
171 goto err1;
172 spin_lock_irqsave(&alarm_slock, flags);
173 rv = alarm_pending;
174 wait_pending = 1;
175 alarm_pending = 0;
176 if (rv & ANDROID_ALARM_WAKEUP_MASK)
177 wake_unlock(&alarm_rtc_wake_lock);
178 spin_unlock_irqrestore(&alarm_slock, flags);
179 break;
180 case ANDROID_ALARM_SET_RTC:
181 if (copy_from_user(&new_rtc_time, (void __user *)arg,
182 sizeof(new_rtc_time))) {
183 rv = -EFAULT;
184 goto err1;
185 }
186 rtc_time_to_tm(new_rtc_time.tv_sec, &rtc_new_rtc_time);
187
188 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_IO,
189 "set rtc %ld %ld - rtc %02d:%02d:%02d %02d/%02d/%04d\n",
190 new_rtc_time.tv_sec, new_rtc_time.tv_nsec,
191 rtc_new_rtc_time.tm_hour, rtc_new_rtc_time.tm_min,
192 rtc_new_rtc_time.tm_sec, rtc_new_rtc_time.tm_mon + 1,
193 rtc_new_rtc_time.tm_mday,
194 rtc_new_rtc_time.tm_year + 1900);
195
196 mutex_lock(&alarm_setrtc_mutex);
197 spin_lock_irqsave(&alarm_slock, flags);
198 for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++)
199 hrtimer_try_to_cancel(&alarm_timer[i]);
200 getnstimeofday(&tmp_time);
201 elapsed_rtc_delta = timespec_sub(elapsed_rtc_delta,
202 timespec_sub(tmp_time, new_rtc_time));
203 spin_unlock_irqrestore(&alarm_slock, flags);
204 rv = do_settimeofday(&new_rtc_time);
205 spin_lock_irqsave(&alarm_slock, flags);
206 for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++)
207 alarm_start_hrtimer(i);
208 spin_unlock_irqrestore(&alarm_slock, flags);
209 if (rv < 0) {
210 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_ERRORS,
211 "Failed to set time\n");
212 mutex_unlock(&alarm_setrtc_mutex);
213 goto err1;
214 }
215 rv = rtc_set_time(alarm_rtc_dev, &rtc_new_rtc_time);
216 spin_lock_irqsave(&alarm_slock, flags);
217 alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
218 wake_up(&alarm_wait_queue);
219 spin_unlock_irqrestore(&alarm_slock, flags);
220 mutex_unlock(&alarm_setrtc_mutex);
221 if (rv < 0) {
222 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_ERRORS,
223 "Failed to set RTC, time will be lost on reboot\n");
224 goto err1;
225 }
226 break;
227 case ANDROID_ALARM_GET_TIME(0):
228 mutex_lock(&alarm_setrtc_mutex);
229 spin_lock_irqsave(&alarm_slock, flags);
230 if (alarm_type != ANDROID_ALARM_SYSTEMTIME) {
231 getnstimeofday(&tmp_time);
232 if (alarm_type >= ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP)
233 tmp_time = timespec_sub(tmp_time,
234 elapsed_rtc_delta);
235 } else
236 ktime_get_ts(&tmp_time);
237 spin_unlock_irqrestore(&alarm_slock, flags);
238 mutex_unlock(&alarm_setrtc_mutex);
239 if (copy_to_user((void __user *)arg, &tmp_time,
240 sizeof(tmp_time))) {
241 rv = -EFAULT;
242 goto err1;
243 }
244 break;
245
246 default:
247 rv = -EINVAL;
248 goto err1;
249 }
250 err1:
251 return rv;
252 }
253
alarm_open(struct inode * inode,struct file * file)254 static int alarm_open(struct inode *inode, struct file *file)
255 {
256 file->private_data = NULL;
257 return 0;
258 }
259
alarm_release(struct inode * inode,struct file * file)260 static int alarm_release(struct inode *inode, struct file *file)
261 {
262 int i;
263 unsigned long flags;
264
265 spin_lock_irqsave(&alarm_slock, flags);
266 if (file->private_data != 0) {
267 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
268 uint32_t alarm_type_mask = 1U << i;
269 if (alarm_enabled & alarm_type_mask) {
270 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
271 "alarm_release: clear alarm, "
272 "pending %d\n",
273 !!(alarm_pending & alarm_type_mask));
274 alarm_enabled &= ~alarm_type_mask;
275 }
276 spin_unlock_irqrestore(&alarm_slock, flags);
277 hrtimer_cancel(&alarm_timer[i]);
278 spin_lock_irqsave(&alarm_slock, flags);
279 }
280 if (alarm_pending | wait_pending) {
281 if (alarm_pending)
282 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
283 "alarm_release: clear pending alarms "
284 "%x\n", alarm_pending);
285 wake_unlock(&alarm_wake_lock);
286 wait_pending = 0;
287 alarm_pending = 0;
288 }
289 alarm_opened = 0;
290 }
291 spin_unlock_irqrestore(&alarm_slock, flags);
292 return 0;
293 }
294
alarm_timer_triggered(struct hrtimer * timer)295 static enum hrtimer_restart alarm_timer_triggered(struct hrtimer *timer)
296 {
297 unsigned long flags;
298 enum android_alarm_type alarm_type = (timer - alarm_timer);
299 uint32_t alarm_type_mask = 1U << alarm_type;
300
301
302 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INT,
303 "alarm_timer_triggered type %d\n", alarm_type);
304 spin_lock_irqsave(&alarm_slock, flags);
305 if (alarm_enabled & alarm_type_mask) {
306 wake_lock_timeout(&alarm_wake_lock, 5 * HZ);
307 alarm_enabled &= ~alarm_type_mask;
308 alarm_pending |= alarm_type_mask;
309 wake_up(&alarm_wait_queue);
310 }
311 spin_unlock_irqrestore(&alarm_slock, flags);
312 return HRTIMER_NORESTART;
313 }
314
alarm_triggered_func(void * p)315 static void alarm_triggered_func(void *p)
316 {
317 struct rtc_device *rtc = alarm_rtc_dev;
318 if (!(rtc->irq_data & RTC_AF))
319 return;
320 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INT, "rtc alarm triggered\n");
321 wake_lock_timeout(&alarm_rtc_wake_lock, 1 * HZ);
322 }
323
alarm_suspend(struct platform_device * pdev,pm_message_t state)324 int alarm_suspend(struct platform_device *pdev, pm_message_t state)
325 {
326 int err = 0;
327 unsigned long flags;
328 struct rtc_wkalrm rtc_alarm;
329 struct rtc_time rtc_current_rtc_time;
330 unsigned long rtc_current_time;
331 unsigned long rtc_alarm_time;
332 struct timespec rtc_current_timespec;
333 struct timespec rtc_delta;
334 struct timespec elapsed_realtime_alarm_time;
335
336 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_FLOW,
337 "alarm_suspend(%p, %d)\n", pdev, state.event);
338 spin_lock_irqsave(&alarm_slock, flags);
339 if (alarm_pending && !wake_lock_active(&alarm_wake_lock)) {
340 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
341 "alarm pending\n");
342 err = -EBUSY;
343 goto err1;
344 }
345 if (alarm_enabled & ANDROID_ALARM_WAKEUP_MASK) {
346 spin_unlock_irqrestore(&alarm_slock, flags);
347 if (alarm_enabled & ANDROID_ALARM_RTC_WAKEUP_MASK)
348 hrtimer_cancel(&alarm_timer[ANDROID_ALARM_RTC_WAKEUP]);
349 if (alarm_enabled & ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
350 hrtimer_cancel(&alarm_timer[
351 ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP]);
352
353 rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
354 rtc_current_timespec.tv_nsec = 0;
355 rtc_tm_to_time(&rtc_current_rtc_time,
356 &rtc_current_timespec.tv_sec);
357 save_time_delta(&rtc_delta, &rtc_current_timespec);
358 set_normalized_timespec(&elapsed_realtime_alarm_time,
359 alarm_time[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP]
360 .tv_sec + elapsed_rtc_delta.tv_sec,
361 alarm_time[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP]
362 .tv_nsec + elapsed_rtc_delta.tv_nsec);
363 if ((alarm_enabled & ANDROID_ALARM_RTC_WAKEUP_MASK) &&
364 (!(alarm_enabled &
365 ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK) ||
366 timespec_compare(&alarm_time[ANDROID_ALARM_RTC_WAKEUP],
367 &elapsed_realtime_alarm_time) < 0))
368 rtc_alarm_time = timespec_sub(
369 alarm_time[ANDROID_ALARM_RTC_WAKEUP],
370 rtc_delta).tv_sec;
371 else
372 rtc_alarm_time = timespec_sub(
373 elapsed_realtime_alarm_time, rtc_delta).tv_sec;
374 rtc_time_to_tm(rtc_alarm_time, &rtc_alarm.time);
375 rtc_alarm.enabled = 1;
376 rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
377 rtc_read_time(alarm_rtc_dev, &rtc_current_rtc_time);
378 rtc_tm_to_time(&rtc_current_rtc_time, &rtc_current_time);
379 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
380 "rtc alarm set at %ld, now %ld, rtc delta %ld.%09ld\n",
381 rtc_alarm_time, rtc_current_time,
382 rtc_delta.tv_sec, rtc_delta.tv_nsec);
383 if (rtc_current_time + 1 >= rtc_alarm_time) {
384 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
385 "alarm about to go off\n");
386 memset(&rtc_alarm, 0, sizeof(rtc_alarm));
387 rtc_alarm.enabled = 0;
388 rtc_set_alarm(alarm_rtc_dev, &rtc_alarm);
389
390 spin_lock_irqsave(&alarm_slock, flags);
391 wake_lock_timeout(&alarm_rtc_wake_lock, 2 * HZ);
392 alarm_start_hrtimer(ANDROID_ALARM_RTC_WAKEUP);
393 alarm_start_hrtimer(
394 ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP);
395 err = -EBUSY;
396 spin_unlock_irqrestore(&alarm_slock, flags);
397 }
398 } else {
399 err1:
400 spin_unlock_irqrestore(&alarm_slock, flags);
401 }
402 return err;
403 }
404
alarm_resume(struct platform_device * pdev)405 int alarm_resume(struct platform_device *pdev)
406 {
407 struct rtc_wkalrm alarm;
408 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_FLOW,
409 "alarm_resume(%p)\n", pdev);
410 if (alarm_enabled & ANDROID_ALARM_WAKEUP_MASK) {
411 memset(&alarm, 0, sizeof(alarm));
412 alarm.enabled = 0;
413 rtc_set_alarm(alarm_rtc_dev, &alarm);
414 alarm_start_hrtimer(ANDROID_ALARM_RTC_WAKEUP);
415 alarm_start_hrtimer(ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP);
416 }
417 return 0;
418 }
419
420 static struct rtc_task alarm_rtc_task = {
421 .func = alarm_triggered_func
422 };
423
424 static struct file_operations alarm_fops = {
425 .owner = THIS_MODULE,
426 .unlocked_ioctl = alarm_ioctl,
427 .open = alarm_open,
428 .release = alarm_release,
429 };
430
431 static struct miscdevice alarm_device = {
432 .minor = MISC_DYNAMIC_MINOR,
433 .name = "alarm",
434 .fops = &alarm_fops,
435 };
436
rtc_alarm_add_device(struct device * dev,struct class_interface * class_intf)437 static int rtc_alarm_add_device(struct device *dev,
438 struct class_interface *class_intf)
439 {
440 int err;
441 struct rtc_device *rtc = to_rtc_device(dev);
442
443 mutex_lock(&alarm_setrtc_mutex);
444
445 if (alarm_rtc_dev) {
446 err = -EBUSY;
447 goto err1;
448 }
449
450 err = misc_register(&alarm_device);
451 if (err)
452 goto err1;
453 alarm_platform_dev =
454 platform_device_register_simple("alarm", -1, NULL, 0);
455 if (IS_ERR(alarm_platform_dev)) {
456 err = PTR_ERR(alarm_platform_dev);
457 goto err2;
458 }
459 err = rtc_irq_register(rtc, &alarm_rtc_task);
460 if (err)
461 goto err3;
462 alarm_rtc_dev = rtc;
463 mutex_unlock(&alarm_setrtc_mutex);
464
465 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO, "alarm: parent %p\n",
466 alarm_platform_dev->dev.power.pm_parent);
467 return 0;
468
469 err3:
470 platform_device_unregister(alarm_platform_dev);
471 err2:
472 misc_deregister(&alarm_device);
473 err1:
474 mutex_unlock(&alarm_setrtc_mutex);
475 return err;
476 }
477
rtc_alarm_remove_device(struct device * dev,struct class_interface * class_intf)478 static void rtc_alarm_remove_device(struct device *dev,
479 struct class_interface *class_intf)
480 {
481 if (dev == &alarm_rtc_dev->dev) {
482 rtc_irq_unregister(alarm_rtc_dev, &alarm_rtc_task);
483 platform_device_unregister(alarm_platform_dev);
484 misc_deregister(&alarm_device);
485 alarm_rtc_dev = NULL;
486 }
487 }
488
489 static struct class_interface rtc_alarm_interface = {
490 .add_dev = &rtc_alarm_add_device,
491 .remove_dev = &rtc_alarm_remove_device,
492 };
493
494 static struct platform_driver alarm_driver = {
495 .suspend = alarm_suspend,
496 .resume = alarm_resume,
497 .driver = {
498 .name = "alarm"
499 }
500 };
501
alarm_late_init(void)502 static int __init alarm_late_init(void)
503 {
504 unsigned long flags;
505 struct timespec system_time;
506
507 /* this needs to run after the rtc is read at boot */
508 spin_lock_irqsave(&alarm_slock, flags);
509 /* We read the current rtc and system time so we can later calulate
510 * elasped realtime to be (boot_systemtime + rtc - boot_rtc) ==
511 * (rtc - (boot_rtc - boot_systemtime))
512 */
513 getnstimeofday(&elapsed_rtc_delta);
514 ktime_get_ts(&system_time);
515 elapsed_rtc_delta = timespec_sub(elapsed_rtc_delta, system_time);
516 spin_unlock_irqrestore(&alarm_slock, flags);
517
518 ANDROID_ALARM_DPRINTF(ANDROID_ALARM_PRINT_INFO,
519 "alarm_late_init: rtc to elapsed realtime delta %ld.%09ld\n",
520 elapsed_rtc_delta.tv_sec, elapsed_rtc_delta.tv_nsec);
521 return 0;
522 }
523
alarm_init(void)524 static int __init alarm_init(void)
525 {
526 int err;
527 int i;
528
529 for (i = 0; i < ANDROID_ALARM_SYSTEMTIME; i++) {
530 hrtimer_init(&alarm_timer[i], CLOCK_REALTIME, HRTIMER_MODE_ABS);
531 alarm_timer[i].function = alarm_timer_triggered;
532 }
533 hrtimer_init(&alarm_timer[ANDROID_ALARM_SYSTEMTIME],
534 CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
535 alarm_timer[ANDROID_ALARM_SYSTEMTIME].function = alarm_timer_triggered;
536 err = platform_driver_register(&alarm_driver);
537 if (err < 0)
538 goto err1;
539 wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm");
540 wake_lock_init(&alarm_rtc_wake_lock, WAKE_LOCK_SUSPEND, "alarm_rtc");
541 rtc_alarm_interface.class = rtc_class;
542 err = class_interface_register(&rtc_alarm_interface);
543 if (err < 0)
544 goto err2;
545
546 return 0;
547
548 err2:
549 wake_lock_destroy(&alarm_rtc_wake_lock);
550 wake_lock_destroy(&alarm_wake_lock);
551 platform_driver_unregister(&alarm_driver);
552 err1:
553 return err;
554 }
555
alarm_exit(void)556 static void __exit alarm_exit(void)
557 {
558 class_interface_unregister(&rtc_alarm_interface);
559 wake_lock_destroy(&alarm_rtc_wake_lock);
560 wake_lock_destroy(&alarm_wake_lock);
561 platform_driver_unregister(&alarm_driver);
562 }
563
564 late_initcall(alarm_late_init);
565 module_init(alarm_init);
566 module_exit(alarm_exit);
567
568