blob: 9ba5e2af0a9e02abc72dd61cd4d2348f2b3fc767 [file] [log] [blame]
// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package power
import (
const (
dbusDisplayName = "org.chromium.DisplayService"
dbusDisplayPath = "/org/chromium/DisplayService"
dbusDisplayInterface = "org.chromium.DisplayServiceInterface"
// DisplayManager is used to interact with the display service over D-Bus.
type DisplayManager struct { // NOLINT
conn *dbus.Conn
obj dbus.BusObject
// DisplayPowerStatus is setting to change the power status of the display.
type DisplayPowerStatus int
// These consts are from /src/platform2/system_api/dbus/service_constants.h
const (
DisplayPowerAllOn DisplayPowerStatus = iota
// NewDisplayManager connects to display_service via D-Bus and returns a DisplayManager object.
func NewDisplayManager(ctx context.Context) (*DisplayManager, error) {
conn, obj, err := dbusutil.Connect(ctx, dbusDisplayName, dbusDisplayPath)
if err != nil {
return nil, err
return &DisplayManager{conn, obj}, nil
// SetDisplayPower sets the display values by sending SetPower to DisplayService.
func SetDisplayPower(ctx context.Context, powerStatus DisplayPowerStatus) error {
displayd, err := NewDisplayManager(ctx)
if err != nil {
return errors.Wrap(err, "failed to create a DisplayManager object")
if err := displayd.obj.CallWithContext(ctx, dbusDisplayInterface+".SetPower", 1, powerStatus).Err; err != nil {
return errors.Wrap(err, "faild to call SetPower D-Bus method")
return nil