HID: wacom: Add pad buttons reporting on Intuos4 WL
This patch adds reporting of 1 wheel button and 8 strip buttons for Intuos4 WL. The buttons are reported as BTN_0 to BTN_9. The change of type butstate variable is required as the old type 'char' couldn't store state of 9 buttons. The change is not affecting Graphire tablet as it only uses first 2 bits of 'butstate'. Signed-off-by: Przemo Firszt <przemo@firszt.eu> Acked-by:Ping Cheng <pinglinux@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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