Input: add open and close methods for polled devices

Optional open and close methods for preparing and closing
the device.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

include/linux/input-polldev.h

diff --git a/include/linux/input-polldev.h b/include/linux/input-polldev.h
index 597a007..5c0ec68 100644
--- a/include/linux/input-polldev.h
+++ b/include/linux/input-polldev.h
@@ -14,9 +14,11 @@
 
 /**
  * struct input_polled_dev - simple polled input device
- * @private: private driver data
- * @flush: driver-supplied method that flushes device's state upon
- *	opening (optional)
+ * @private: private driver data.
+ * @open: driver-supplied method that prepares device for polling
+ *	(enabled the device and maybe flushes device state).
+ * @close: driver-supplied method that is called when device is no
+ *	longer being polled. Used to put device into low power mode.
  * @poll: driver-supplied method that polls the device and posts
  *	input events (mandatory).
  * @poll_interval: specifies how often the poll() method shoudl be called.
@@ -30,7 +32,8 @@
 struct input_polled_dev {
 	void *private;
 
-	void (*flush)(struct input_polled_dev *dev);
+	void (*open)(struct input_polled_dev *dev);
+	void (*close)(struct input_polled_dev *dev);
 	void (*poll)(struct input_polled_dev *dev);
 	unsigned int poll_interval; /* msec */