HID: roccat: add support for Roccat Lua

This patch adds support for Roccat Lua gaming mouse.

Userland tools can soon be found at http://sourceforge.net/projects/roccat

Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/ABI/testing/sysfs-driver-hid-roccat-lua b/Documentation/ABI/testing/sysfs-driver-hid-roccat-lua
new file mode 100644
index 0000000..31c6c4c
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-hid-roccat-lua
@@ -0,0 +1,7 @@
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/control
+Date:		October 2012
+Contact:	Stefan Achatz <erazor_de@users.sourceforge.net>
+Description:	When written, cpi, button and light settings can be configured.
+		When read, actual cpi setting and sensor data are returned.
+		The data has to be 8 bytes long.
+Users:		http://roccat.sourceforge.net