mfd: Add ability to wake the system for 88pm860x

For 88pm860x pmic, it can wake the system from low power mode by irq,
its sub-devs like RTC and onkey can be enabled for this usage.

Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/mfd/88pm860x-i2c.c b/drivers/mfd/88pm860x-i2c.c
index f93dd9571c3c..b2cfdc458561 100644
--- a/drivers/mfd/88pm860x-i2c.c
+++ b/drivers/mfd/88pm860x-i2c.c
@@ -334,10 +334,35 @@ static int __devexit pm860x_remove(struct i2c_client *client)
         return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int pm860x_suspend(struct device *dev)
+{
+        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+        struct pm860x_chip *chip = i2c_get_clientdata(client);
+
+        if (device_may_wakeup(dev) && chip->wakeup_flag)
+                enable_irq_wake(chip->core_irq);
+        return 0;
+}
+
+static int pm860x_resume(struct device *dev)
+{
+        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+        struct pm860x_chip *chip = i2c_get_clientdata(client);
+
+        if (device_may_wakeup(dev) && chip->wakeup_flag)
+                disable_irq_wake(chip->core_irq);
+        return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pm860x_pm_ops, pm860x_suspend, pm860x_resume);
+
 static struct i2c_driver pm860x_driver = {
         .driver = {
                 .name   = "88PM860x",
                 .owner  = THIS_MODULE,
+                .pm     = &pm860x_pm_ops,
         },
         .probe          = pm860x_probe,
         .remove         = __devexit_p(pm860x_remove),