gmux_read32
return gmux_read32(gmux_data, GMUX_PORT_BRIGHTNESS) &
data = gmux_read32(gmux_data, gmux_data->selected_port);
version = gmux_read32(gmux_data, GMUX_PORT_VERSION_MAJOR);
props.max_brightness = gmux_read32(gmux_data, GMUX_PORT_MAX_BRIGHTNESS);