Input: introduce input_inject_event() function

Create input_inject_event() function which is to be used by input
handlers as opposed to input_event() which is reserved for drivers
implementing input devices. The difference is that if device is
"grabbed" by some process input_inject_event() will ignore events
unless sent from the handle that is currently owns the device.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/include/linux/input.h b/include/linux/input.h
index 55e628e..b3253ab 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -1053,6 +1053,7 @@
 int input_flush_device(struct input_handle* handle, struct file* file);
 
 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
+void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
 
 static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
 {