RTC: system suspend, RTC can auto wake up the system

drivers/rtc/Kconfig

@@ -123,6 +123,14 @@ config RTC_INTF_ALARM_DEV
 	help
 	  Exports the alarm interface to user-space.
 
+config AUTO_WAKE_UP
+	tristate "Support auto wake up"
+	depends on RTC_INTF_ALARM_DEV
+
+config AUTO_WAKE_UP_PERIOD
+	int "auto wake up period(sec)"
+	depends on AUTO_WAKE_UP
+	default 3600
 
 config RTC_DRV_TEST
 	tristate "Test driver/device"

drivers/rtc/Makefile

@@ -15,6 +15,8 @@ rtc-core-$(CONFIG_RTC_INTF_DEV)	+= rtc-dev.o
 rtc-core-$(CONFIG_RTC_INTF_PROC) += rtc-proc.o
 rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
 
+obj-$(CONFIG_AUTO_WAKE_UP) += auto-wake.o
+
 # Keep the list ordered.
 
 obj-$(CONFIG_RTC_DRV_88PM860X)  += rtc-88pm860x.o

drivers/rtc/auto-wake.c

@@ -0,0 +1,128 @@
+#include <linux/android_alarm.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/sysdev.h>
+#include <linux/wakelock.h>
+#include <linux/power_supply.h>
+#include <linux/suspend.h>
+
+#include <asm/mach/time.h>
+
+struct auto_wake
+{
+	struct alarm alarm;
+	struct timespec timer;
+	//struct notifier_block pm_nb;
+};
+
+static struct auto_wake auto_wake;
+struct timespec set_atuo_wake_time( struct timespec timer)
+{
+	struct timespec new_time;
+	struct timespec tmp_time;
+	
+	tmp_time =ktime_to_timespec(alarm_get_elapsed_realtime());
+
+	printk("nowtime = %ld \n",tmp_time.tv_sec);
+	
+	new_time.tv_nsec = timer.tv_nsec+ tmp_time.tv_nsec;
+	new_time.tv_sec =  timer.tv_sec+ tmp_time.tv_sec;
+
+	return new_time;
+}
+
+static void auto_wake_update(struct auto_wake *auto_wake)
+{
+
+	struct timespec new_alarm_time;
+	
+//	printk("auto_wake_update\n");
+	new_alarm_time = set_atuo_wake_time(auto_wake->timer);
+	alarm_start_range(&auto_wake->alarm,
+			timespec_to_ktime(new_alarm_time),
+			timespec_to_ktime(new_alarm_time));
+}
+
+static void atuo_wake_trigger(struct alarm *alarm)
+{
+
+	struct auto_wake *auto_wake = container_of(alarm, struct auto_wake,
+						    alarm);
+
+	auto_wake_update(auto_wake);
+}
+
+
+#if 0
+static void auto_wake_cancel(struct auto_wake *auto_wake)
+{
+	alarm_cancel(&auto_wake->alarm);
+}
+
+
+
+static int auto_wake_callback(struct notifier_block *nfb,
+					unsigned long action,
+					void *ignored)
+{
+
+	struct auto_wake *auto_wake = container_of(nfb, struct auto_wake,
+						    pm_nb);
+
+	switch (action)
+	{
+		case PM_SUSPEND_PREPARE:
+		{
+			printk("PM_SUSPEND_PREPARExsf \n");
+			auto_wake_update(auto_wake);
+			return NOTIFY_OK;
+		}
+		case PM_POST_SUSPEND:
+		{
+			printk("PM_POST_SUSPENDxsf \n");
+		//	auto_wake_cancel(auto_wake);
+			return NOTIFY_OK;
+		}
+	}
+
+	return NOTIFY_DONE;
+}
+
+
+static struct notifier_block auto_wake_pm_notifier = {
+	.notifier_call = auto_wake_callback,
+	.priority = 0,
+};
+
+#endif
+
+void auto_wake_init(struct auto_wake *auto_wake,struct timespec timer)
+{
+//	auto_wake->pm_nb = auto_wake_pm_notifier;
+	auto_wake->timer = timer;
+	
+	alarm_init(&auto_wake->alarm,	ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP, atuo_wake_trigger);
+
+	//register_pm_notifier(&auto_wake->pm_nb);// xsf
+
+}
+
+static int  __init start_auto_wake(void)
+{
+   
+	struct timespec timer;
+
+	printk("CONFIG_AUTO_WAKE_UP_PERIOD = %d\n", CONFIG_AUTO_WAKE_UP_PERIOD);
+	timer.tv_sec =   CONFIG_AUTO_WAKE_UP_PERIOD;
+	timer.tv_nsec = 0;
+	
+	auto_wake_init(&auto_wake,timer);
+	auto_wake_update(&auto_wake);
+	return 0;
+} 
+
+late_initcall_sync(start_auto_wake);