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authorJohn Stultz <john.stultz@linaro.org>2011-01-11 09:42:13 -0800
committerJohn Stultz <john.stultz@linaro.org>2011-04-26 14:01:44 -0700
commitff3ead96d17f47ee70c294a5cc2cce9b61e82f0f (patch)
treee87fc16e1fc4a80b9591c2b1d02c99459254aa95 /include/linux/alarmtimer.h
parent88d19cf37952a7e1e38b2bf87a00f0e857e63180 (diff)
timers: Introduce in-kernel alarm-timer interface
This provides the in kernel interface and infrastructure for alarm-timers. Alarm-timers are a hybrid style timer, similar to hrtimers, but when the system is suspended, the RTC device is set to fire and wake the system for when the soonest alarm-timer expires. The concept for Alarm-timers was inspired by the Android Alarm driver (by Arve Hjønnevåg) found in the Android kernel tree. See: http://android.git.kernel.org/?p=kernel/common.git;a=blob;f=drivers/rtc/alarm.c;h=1250edfbdf3302f5e4ea6194847c6ef4bb7beb1c;hb=android-2.6.36 This in-kernel interface should be fairly compatible with the Android alarm driver in-kernel interface, but has the advantage of utilizing the new RTC timerqueue code instead of doing direct RTC manipulation. CC: Arve Hjønnevåg <arve@android.com> CC: Thomas Gleixner <tglx@linutronix.de> CC: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'include/linux/alarmtimer.h')
-rw-r--r--include/linux/alarmtimer.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/alarmtimer.h b/include/linux/alarmtimer.h
new file mode 100644
index 000000000000..6b364b2e2074
--- /dev/null
+++ b/include/linux/alarmtimer.h
@@ -0,0 +1,30 @@
+#ifndef _LINUX_ALARMTIMER_H
+#define _LINUX_ALARMTIMER_H
+
+#include <linux/time.h>
+#include <linux/hrtimer.h>
+#include <linux/timerqueue.h>
+#include <linux/rtc.h>
+
+enum alarmtimer_type {
+ ALARM_REALTIME,
+ ALARM_BOOTTIME,
+
+ ALARM_NUMTYPE,
+};
+
+struct alarm {
+ struct timerqueue_node node;
+ ktime_t period;
+ void (*function)(struct alarm *);
+ enum alarmtimer_type type;
+ char enabled;
+ void *data;
+};
+
+void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
+ void (*function)(struct alarm *));
+void alarm_start(struct alarm *alarm, ktime_t start, ktime_t period);
+void alarm_cancel(struct alarm *alarm);
+
+#endif