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A struct device parameter is used in the enable and disable callbacks to distinguish between different gpio_keys devices. Platforms that don't use these callbacks may not include struct device at all, as seen on arch/arm/mach-s3c2410/mach-n30.c Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>