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/wakelock.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)
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
);