Function wacom_sys::libwacom_get_button_led_group

pub unsafe extern "C" fn libwacom_get_button_led_group(
    device: *const WacomDevice, 
    button: c_char
) -> c_int

@param device The tablet to query @param button The ID of the button to check for, between 'A' and 'Z' @return the status LED group id to use or -1 if no LED is available for the given tablet / button