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RMI4 F3A supports the touchpad GPIO function, it's designed to support more GPIOs and used on newer touchpads. This patch adds support of the touchpad buttons. Signed-off-by: Vincent Huang <vincent.huang@tw.synaptics.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andrew Duggan <aduggan@synaptics.com> Link: https://lore.kernel.org/r/20200930094147.635556-3-vincent.huang@tw.synaptics.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>