system/fidl/fuchsia-hardware-backlight/backlight.fidl

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.hardware.backlight;

struct State {
    bool on;
    // The unitless brightness value on a linear scale where 0 is the minimum
    // brightness and 255 is the maximum brightness.
    uint8 brightness;
};

[Layout = "Simple"]
interface Device {
    // Gets the current backlight brightness
    1: GetState() -> (State state);

    // Sets the current backlight brightness
    2: SetState(State state);
};