blob: c0773177bd7d8c0f1c83e1ae9e2a6594c6cb59a5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/*
* Copyright (C) 2013 The CyanogenMod Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.power;
import android.content.Context;
import android.os.SystemProperties;
import android.provider.Settings;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* Certain display devices require that we set a special mode when enabling auto-brightness.
* This is done by setting a sysfs node. This behavior can be configured by setting the
* config_panelAutoBrightnessValue to the integer value to write when enabled.
*
* Some high-end panels might support alternative brightness modes such as high gamma. This
* is highly device-specific, but we will support these via a persistent system property.
*
* @hide
*/
public class AutoBrightnessHandler {
private static final String NODE = "/sys/class/lcd/panel/panel/auto_brightness";
private static final String ALT_BRIGHTNESS_PROP = "persist.sys.alt.brightness";
private static final int PANEL_MANUAL = 0;
private final int mPanelAutoValue;
public AutoBrightnessHandler(Context context) {
mPanelAutoValue = context.getResources().getInteger(
com.android.internal.R.integer.config_panelAutoBrightnessValue);
}
public void onAutoBrightnessChanged(int mode) {
if (mPanelAutoValue > -1) {
int override = SystemProperties.getInt(ALT_BRIGHTNESS_PROP, -1);
writeValue(NODE, mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC ?
(override > -1 ? override : mPanelAutoValue) : PANEL_MANUAL);
}
}
private static void writeValue(String filename, int value) {
try {
FileOutputStream fos = new FileOutputStream(new File(filename));
fos.write(String.valueOf(value).getBytes());
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
|
