1 /* drivers/rtc/alarm-dev.c
3 * Copyright (C) 2007-2009 Google, Inc.
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.
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.
16 #include <linux/time.h>
17 #include <linux/module.h>
18 #include <linux/device.h>
19 #include <linux/miscdevice.h>
21 #include <linux/platform_device.h>
22 #include <linux/sched.h>
23 #include <linux/spinlock.h>
24 #include <linux/uaccess.h>
25 #include <linux/alarmtimer.h>
26 #include "android_alarm.h"
28 #define ANDROID_ALARM_PRINT_INFO (1U << 0)
29 #define ANDROID_ALARM_PRINT_IO (1U << 1)
30 #define ANDROID_ALARM_PRINT_INT (1U << 2)
33 static int debug_mask = ANDROID_ALARM_PRINT_INFO;
34 module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
36 #define pr_alarm(debug_level_mask, args...) \
38 if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
43 #define ANDROID_ALARM_WAKEUP_MASK ( \
44 ANDROID_ALARM_RTC_WAKEUP_MASK | \
45 ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
47 /* support old userspace code */
48 #define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
49 #define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
51 static int alarm_opened;
52 static DEFINE_SPINLOCK(alarm_slock);
53 static struct wakeup_source alarm_wake_lock;
54 static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
55 static uint32_t alarm_pending;
56 static uint32_t alarm_enabled;
57 static uint32_t wait_pending;
64 enum android_alarm_type type;
67 static struct devalarm alarms[ANDROID_ALARM_TYPE_COUNT];
70 static int is_wakeup(enum android_alarm_type type)
72 if (type == ANDROID_ALARM_RTC_WAKEUP ||
73 type == ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP)
79 static void devalarm_start(struct devalarm *alrm, ktime_t exp)
81 if (is_wakeup(alrm->type))
82 alarm_start(&alrm->u.alrm, exp);
84 hrtimer_start(&alrm->u.hrt, exp, HRTIMER_MODE_ABS);
88 static int devalarm_try_to_cancel(struct devalarm *alrm)
91 if (is_wakeup(alrm->type))
92 ret = alarm_try_to_cancel(&alrm->u.alrm);
94 ret = hrtimer_try_to_cancel(&alrm->u.hrt);
98 static void devalarm_cancel(struct devalarm *alrm)
100 if (is_wakeup(alrm->type))
101 alarm_cancel(&alrm->u.alrm);
103 hrtimer_cancel(&alrm->u.hrt);
107 static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
111 struct timespec new_alarm_time;
112 struct timespec new_rtc_time;
113 struct timespec tmp_time;
114 struct rtc_time new_rtc_tm;
115 struct rtc_device *rtc_dev;
116 enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
117 uint32_t alarm_type_mask = 1U << alarm_type;
119 if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
122 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
123 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
125 if (file->private_data == NULL &&
126 cmd != ANDROID_ALARM_SET_RTC) {
127 spin_lock_irqsave(&alarm_slock, flags);
129 spin_unlock_irqrestore(&alarm_slock, flags);
133 file->private_data = (void *)1;
134 spin_unlock_irqrestore(&alarm_slock, flags);
138 switch (ANDROID_ALARM_BASE_CMD(cmd)) {
139 case ANDROID_ALARM_CLEAR(0):
140 spin_lock_irqsave(&alarm_slock, flags);
141 pr_alarm(IO, "alarm %d clear\n", alarm_type);
142 devalarm_try_to_cancel(&alarms[alarm_type]);
144 alarm_pending &= ~alarm_type_mask;
145 if (!alarm_pending && !wait_pending)
146 __pm_relax(&alarm_wake_lock);
148 alarm_enabled &= ~alarm_type_mask;
149 spin_unlock_irqrestore(&alarm_slock, flags);
152 case ANDROID_ALARM_SET_OLD:
153 case ANDROID_ALARM_SET_AND_WAIT_OLD:
154 if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
158 new_alarm_time.tv_nsec = 0;
159 goto from_old_alarm_set;
161 case ANDROID_ALARM_SET_AND_WAIT(0):
162 case ANDROID_ALARM_SET(0):
163 if (copy_from_user(&new_alarm_time, (void __user *)arg,
164 sizeof(new_alarm_time))) {
169 spin_lock_irqsave(&alarm_slock, flags);
170 pr_alarm(IO, "alarm %d set %ld.%09ld\n", alarm_type,
171 new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
172 alarm_enabled |= alarm_type_mask;
173 devalarm_start(&alarms[alarm_type],
174 timespec_to_ktime(new_alarm_time));
175 spin_unlock_irqrestore(&alarm_slock, flags);
176 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
177 && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
180 case ANDROID_ALARM_WAIT:
181 spin_lock_irqsave(&alarm_slock, flags);
182 pr_alarm(IO, "alarm wait\n");
183 if (!alarm_pending && wait_pending) {
184 __pm_relax(&alarm_wake_lock);
187 spin_unlock_irqrestore(&alarm_slock, flags);
188 rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
191 spin_lock_irqsave(&alarm_slock, flags);
195 spin_unlock_irqrestore(&alarm_slock, flags);
197 case ANDROID_ALARM_SET_RTC:
198 if (copy_from_user(&new_rtc_time, (void __user *)arg,
199 sizeof(new_rtc_time))) {
203 rtc_time_to_tm(new_rtc_time.tv_sec, &new_rtc_tm);
204 rtc_dev = alarmtimer_get_rtcdev();
205 rv = do_settimeofday(&new_rtc_time);
209 rv = rtc_set_time(rtc_dev, &new_rtc_tm);
210 spin_lock_irqsave(&alarm_slock, flags);
211 alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
212 wake_up(&alarm_wait_queue);
213 spin_unlock_irqrestore(&alarm_slock, flags);
217 case ANDROID_ALARM_GET_TIME(0):
218 switch (alarm_type) {
219 case ANDROID_ALARM_RTC_WAKEUP:
220 case ANDROID_ALARM_RTC:
221 getnstimeofday(&tmp_time);
223 case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
224 case ANDROID_ALARM_ELAPSED_REALTIME:
225 get_monotonic_boottime(&tmp_time);
227 case ANDROID_ALARM_TYPE_COUNT:
228 case ANDROID_ALARM_SYSTEMTIME:
229 ktime_get_ts(&tmp_time);
232 if (copy_to_user((void __user *)arg, &tmp_time,
247 static int alarm_open(struct inode *inode, struct file *file)
249 file->private_data = NULL;
253 static int alarm_release(struct inode *inode, struct file *file)
258 spin_lock_irqsave(&alarm_slock, flags);
259 if (file->private_data != 0) {
260 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
261 uint32_t alarm_type_mask = 1U << i;
262 if (alarm_enabled & alarm_type_mask) {
263 pr_alarm(INFO, "alarm_release: clear alarm, "
265 !!(alarm_pending & alarm_type_mask));
266 alarm_enabled &= ~alarm_type_mask;
268 spin_unlock_irqrestore(&alarm_slock, flags);
269 devalarm_cancel(&alarms[i]);
270 spin_lock_irqsave(&alarm_slock, flags);
272 if (alarm_pending | wait_pending) {
274 pr_alarm(INFO, "alarm_release: clear "
275 "pending alarms %x\n", alarm_pending);
276 __pm_relax(&alarm_wake_lock);
282 spin_unlock_irqrestore(&alarm_slock, flags);
286 static void devalarm_triggered(struct devalarm *alarm)
289 uint32_t alarm_type_mask = 1U << alarm->type;
291 pr_alarm(INT, "devalarm_triggered type %d\n", alarm->type);
292 spin_lock_irqsave(&alarm_slock, flags);
293 if (alarm_enabled & alarm_type_mask) {
294 __pm_wakeup_event(&alarm_wake_lock, 5000); /* 5secs */
295 alarm_enabled &= ~alarm_type_mask;
296 alarm_pending |= alarm_type_mask;
297 wake_up(&alarm_wait_queue);
299 spin_unlock_irqrestore(&alarm_slock, flags);
303 static enum hrtimer_restart devalarm_hrthandler(struct hrtimer *hrt)
305 struct devalarm *devalrm = container_of(hrt, struct devalarm, u.hrt);
307 devalarm_triggered(devalrm);
308 return HRTIMER_NORESTART;
311 static enum alarmtimer_restart devalarm_alarmhandler(struct alarm *alrm,
314 struct devalarm *devalrm = container_of(alrm, struct devalarm, u.alrm);
316 devalarm_triggered(devalrm);
317 return ALARMTIMER_NORESTART;
321 static const struct file_operations alarm_fops = {
322 .owner = THIS_MODULE,
323 .unlocked_ioctl = alarm_ioctl,
325 .release = alarm_release,
328 static struct miscdevice alarm_device = {
329 .minor = MISC_DYNAMIC_MINOR,
334 static int __init alarm_dev_init(void)
339 err = misc_register(&alarm_device);
343 alarm_init(&alarms[ANDROID_ALARM_RTC_WAKEUP].u.alrm,
344 ALARM_REALTIME, devalarm_alarmhandler);
345 hrtimer_init(&alarms[ANDROID_ALARM_RTC].u.hrt,
346 CLOCK_REALTIME, HRTIMER_MODE_ABS);
347 alarm_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP].u.alrm,
348 ALARM_BOOTTIME, devalarm_alarmhandler);
349 hrtimer_init(&alarms[ANDROID_ALARM_ELAPSED_REALTIME].u.hrt,
350 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
351 hrtimer_init(&alarms[ANDROID_ALARM_SYSTEMTIME].u.hrt,
352 CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
354 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
357 alarms[i].u.hrt.function = devalarm_hrthandler;
360 wakeup_source_init(&alarm_wake_lock, "alarm");
364 static void __exit alarm_dev_exit(void)
366 misc_deregister(&alarm_device);
367 wakeup_source_trash(&alarm_wake_lock);
370 module_init(alarm_dev_init);
371 module_exit(alarm_dev_exit);