Device.Tablet_pad
val get_num_mode_groups : t -> int
val get_mode_group : t -> int -> Mode_group.t option
val get_num_buttons : t -> (int, unit) result
val get_num_dials : t -> (int, unit) result
val get_num_rings : t -> (int, unit) result
val get_num_strips : t -> (int, unit) result
val has_key : t -> Keycode.t -> (bool, unit) result