rtc: max8925: Add function to work as wakeup source

Signed-off-by: Kevin Liu <kliu5@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/rtc/rtc-max8925.c

@@ -261,6 +261,8 @@ static int __devinit max8925_rtc_probe(struct platform_device *pdev)
 	/* XXX - isn't this redundant? */
 	platform_set_drvdata(pdev, info);
 
+	device_init_wakeup(&pdev->dev, 1);
+
 	info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
 					&max8925_rtc_ops, THIS_MODULE);
 	ret = PTR_ERR(info->rtc_dev);
@@ -290,10 +292,34 @@ static int __devexit max8925_rtc_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int max8925_rtc_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
+
+	if (device_may_wakeup(dev))
+		chip->wakeup_flag |= 1 << MAX8925_IRQ_RTC_ALARM0;
+	return 0;
+}
+static int max8925_rtc_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
+
+	if (device_may_wakeup(dev))
+		chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0);
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume);
+
 static struct platform_driver max8925_rtc_driver = {
 	.driver		= {
 		.name	= "max8925-rtc",
 		.owner	= THIS_MODULE,
+		.pm     = &max8925_rtc_pm_ops,
 	},
 	.probe		= max8925_rtc_probe,
 	.remove		= __devexit_p(max8925_rtc_remove),