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 <asm/mach/time.h>
17 #include <linux/android_alarm.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/sysdev.h>
25 #include <linux/uaccess.h>
26 #include <linux/wakelock.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)
32 static int debug_mask = ANDROID_ALARM_PRINT_INFO;
33 module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
35 #define pr_alarm(debug_level_mask, args...) \
37 if (debug_mask & ANDROID_ALARM_PRINT_##debug_level_mask) { \
42 #define ANDROID_ALARM_WAKEUP_MASK ( \
43 ANDROID_ALARM_RTC_WAKEUP_MASK | \
44 ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP_MASK)
46 /* support old usespace code */
47 #define ANDROID_ALARM_SET_OLD _IOW('a', 2, time_t) /* set alarm */
48 #define ANDROID_ALARM_SET_AND_WAIT_OLD _IOW('a', 3, time_t)
50 static int alarm_opened;
51 static DEFINE_SPINLOCK(alarm_slock);
52 static struct wake_lock alarm_wake_lock;
53 static DECLARE_WAIT_QUEUE_HEAD(alarm_wait_queue);
54 static uint32_t alarm_pending;
55 static uint32_t alarm_enabled;
56 static uint32_t wait_pending;
58 static struct alarm alarms[ANDROID_ALARM_TYPE_COUNT];
60 static long alarm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
64 struct timespec new_alarm_time;
65 struct timespec new_rtc_time;
66 struct timespec tmp_time;
67 enum android_alarm_type alarm_type = ANDROID_ALARM_IOCTL_TO_TYPE(cmd);
68 uint32_t alarm_type_mask = 1U << alarm_type;
70 if (alarm_type >= ANDROID_ALARM_TYPE_COUNT)
73 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_GET_TIME(0)) {
74 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
76 if (file->private_data == NULL &&
77 cmd != ANDROID_ALARM_SET_RTC) {
78 spin_lock_irqsave(&alarm_slock, flags);
80 spin_unlock_irqrestore(&alarm_slock, flags);
84 file->private_data = (void *)1;
85 spin_unlock_irqrestore(&alarm_slock, flags);
89 switch (ANDROID_ALARM_BASE_CMD(cmd)) {
90 case ANDROID_ALARM_CLEAR(0):
91 spin_lock_irqsave(&alarm_slock, flags);
92 pr_alarm(IO, "alarm %d clear\n", alarm_type);
93 alarm_try_to_cancel(&alarms[alarm_type]);
95 alarm_pending &= ~alarm_type_mask;
96 if (!alarm_pending && !wait_pending)
97 wake_unlock(&alarm_wake_lock);
99 alarm_enabled &= ~alarm_type_mask;
100 spin_unlock_irqrestore(&alarm_slock, flags);
103 case ANDROID_ALARM_SET_OLD:
104 case ANDROID_ALARM_SET_AND_WAIT_OLD:
105 if (get_user(new_alarm_time.tv_sec, (int __user *)arg)) {
109 new_alarm_time.tv_nsec = 0;
110 goto from_old_alarm_set;
112 case ANDROID_ALARM_SET_AND_WAIT(0):
113 case ANDROID_ALARM_SET(0):
114 if (copy_from_user(&new_alarm_time, (void __user *)arg,
115 sizeof(new_alarm_time))) {
120 spin_lock_irqsave(&alarm_slock, flags);
121 pr_alarm(IO, "alarm %d set %ld.%09ld\n", alarm_type,
122 new_alarm_time.tv_sec, new_alarm_time.tv_nsec);
123 alarm_enabled |= alarm_type_mask;
124 alarm_start_range(&alarms[alarm_type],
125 timespec_to_ktime(new_alarm_time),
126 timespec_to_ktime(new_alarm_time));
127 spin_unlock_irqrestore(&alarm_slock, flags);
128 if (ANDROID_ALARM_BASE_CMD(cmd) != ANDROID_ALARM_SET_AND_WAIT(0)
129 && cmd != ANDROID_ALARM_SET_AND_WAIT_OLD)
132 case ANDROID_ALARM_WAIT:
133 spin_lock_irqsave(&alarm_slock, flags);
134 pr_alarm(IO, "alarm wait\n");
135 if (!alarm_pending && wait_pending) {
136 wake_unlock(&alarm_wake_lock);
139 spin_unlock_irqrestore(&alarm_slock, flags);
140 rv = wait_event_interruptible(alarm_wait_queue, alarm_pending);
143 spin_lock_irqsave(&alarm_slock, flags);
147 spin_unlock_irqrestore(&alarm_slock, flags);
149 case ANDROID_ALARM_SET_RTC:
150 if (copy_from_user(&new_rtc_time, (void __user *)arg,
151 sizeof(new_rtc_time))) {
155 rv = alarm_set_rtc(new_rtc_time);
156 spin_lock_irqsave(&alarm_slock, flags);
157 alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
158 wake_up(&alarm_wait_queue);
159 spin_unlock_irqrestore(&alarm_slock, flags);
163 case ANDROID_ALARM_GET_TIME(0):
164 switch (alarm_type) {
165 case ANDROID_ALARM_RTC_WAKEUP:
166 case ANDROID_ALARM_RTC:
167 getnstimeofday(&tmp_time);
169 case ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP:
170 case ANDROID_ALARM_ELAPSED_REALTIME:
172 ktime_to_timespec(alarm_get_elapsed_realtime());
174 case ANDROID_ALARM_TYPE_COUNT:
175 case ANDROID_ALARM_SYSTEMTIME:
176 ktime_get_ts(&tmp_time);
179 if (copy_to_user((void __user *)arg, &tmp_time,
194 static int alarm_open(struct inode *inode, struct file *file)
196 file->private_data = NULL;
200 static int alarm_release(struct inode *inode, struct file *file)
205 spin_lock_irqsave(&alarm_slock, flags);
206 if (file->private_data != 0) {
207 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
208 uint32_t alarm_type_mask = 1U << i;
209 if (alarm_enabled & alarm_type_mask) {
210 pr_alarm(INFO, "alarm_release: clear alarm, "
212 !!(alarm_pending & alarm_type_mask));
213 alarm_enabled &= ~alarm_type_mask;
215 spin_unlock_irqrestore(&alarm_slock, flags);
216 alarm_cancel(&alarms[i]);
217 spin_lock_irqsave(&alarm_slock, flags);
219 if (alarm_pending | wait_pending) {
221 pr_alarm(INFO, "alarm_release: clear "
222 "pending alarms %x\n", alarm_pending);
223 wake_unlock(&alarm_wake_lock);
229 spin_unlock_irqrestore(&alarm_slock, flags);
233 static void alarm_triggered(struct alarm *alarm)
236 uint32_t alarm_type_mask = 1U << alarm->type;
238 pr_alarm(INT, "alarm_triggered type %d\n", alarm->type);
239 spin_lock_irqsave(&alarm_slock, flags);
240 if (alarm_enabled & alarm_type_mask) {
241 wake_lock_timeout(&alarm_wake_lock, 5 * HZ);
242 alarm_enabled &= ~alarm_type_mask;
243 alarm_pending |= alarm_type_mask;
244 wake_up(&alarm_wait_queue);
246 spin_unlock_irqrestore(&alarm_slock, flags);
249 static const struct file_operations alarm_fops = {
250 .owner = THIS_MODULE,
251 .unlocked_ioctl = alarm_ioctl,
253 .release = alarm_release,
256 static struct miscdevice alarm_device = {
257 .minor = MISC_DYNAMIC_MINOR,
262 static int __init alarm_dev_init(void)
267 err = misc_register(&alarm_device);
271 for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++)
272 alarm_init(&alarms[i], i, alarm_triggered);
273 wake_lock_init(&alarm_wake_lock, WAKE_LOCK_SUSPEND, "alarm");
278 static void __exit alarm_dev_exit(void)
280 misc_deregister(&alarm_device);
281 wake_lock_destroy(&alarm_wake_lock);
284 module_init(alarm_dev_init);
285 module_exit(alarm_dev_exit);