Function libinput_device_led_update 

pub unsafe extern "C" fn libinput_device_led_update(
    device: *mut libinput_device,
    leds: libinput_led,
)

@ingroup device

Update the LEDs on the device, if any. If the device does not have LEDs, or does not have one or more of the LEDs given in the mask, this function does nothing.

@param device A previously obtained device @param leds A mask of the LEDs to set, or unset.