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main.go
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main.go
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/*
* Copyright (C) 2017 ~ 2018 Deepin Technology Co., Ltd.
*
* Author: jouyouyun <jouyouwen717@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
dbus "github.com/godbus/dbus"
"pkg.deepin.io/lib/dbusutil"
"pkg.deepin.io/lib/log"
)
//go:generate dbusutil-gen em -type Manager
const (
dbusServiceName = "com.deepin.daemon.helper.Backlight"
dbusPath = "/com/deepin/daemon/helper/Backlight"
dbusInterface = "com.deepin.daemon.helper.Backlight"
)
const (
DisplayBacklight byte = iota + 1
KeyboardBacklight
)
type Manager struct {
service *dbusutil.Service
}
var logger = log.NewLogger("backlight_helper")
func (*Manager) GetInterfaceName() string {
return dbusInterface
}
func (m *Manager) SetBrightness(type0 byte, name string, value int32) *dbus.Error {
filename, err := getBrightnessFilename(type0, name)
if err != nil {
return dbusutil.ToError(err)
}
fh, err := os.OpenFile(filename, os.O_WRONLY, 0666)
if err != nil {
return dbusutil.ToError(err)
}
defer fh.Close()
_, err = fh.WriteString(strconv.Itoa(int(value)))
if err != nil {
return dbusutil.ToError(err)
}
return nil
}
func getBrightnessFilename(type0 byte, name string) (string, error) {
// check type0
var subsystem string
switch type0 {
case DisplayBacklight:
subsystem = "backlight"
case KeyboardBacklight:
subsystem = "leds"
default:
return "", fmt.Errorf("invalid type %d", type0)
}
// check name
if strings.ContainsRune(name, '/') || name == "" ||
name == "." || name == ".." {
return "", fmt.Errorf("invalid name %q", name)
}
return filepath.Join("/sys/class", subsystem, name, "brightness"), nil
}
func main() {
service, err := dbusutil.NewSystemService()
if err != nil {
logger.Fatal("failed to new system service:", err)
}
m := &Manager{
service: service,
}
err = service.Export(dbusPath, m)
if err != nil {
logger.Fatal("failed to export:", err)
}
err = service.RequestName(dbusServiceName)
if err != nil {
logger.Fatal("failed to request name:", err)
}
service.Wait()
}