1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server;
18
19import android.content.Context;
20import android.content.pm.PackageManager;
21import android.os.Handler;
22import android.os.IHardwareService;
23import android.os.ServiceManager;
24import android.os.Message;
25import android.util.Slog;
26
27import java.io.FileInputStream;
28import java.io.FileOutputStream;
29
30public class LightsService {
31    private static final String TAG = "LightsService";
32    private static final boolean DEBUG = false;
33
34    static final int LIGHT_ID_BACKLIGHT = 0;
35    static final int LIGHT_ID_KEYBOARD = 1;
36    static final int LIGHT_ID_BUTTONS = 2;
37    static final int LIGHT_ID_BATTERY = 3;
38    static final int LIGHT_ID_NOTIFICATIONS = 4;
39    static final int LIGHT_ID_ATTENTION = 5;
40    static final int LIGHT_ID_BLUETOOTH = 6;
41    static final int LIGHT_ID_WIFI = 7;
42    static final int LIGHT_ID_COUNT = 8;
43
44    static final int LIGHT_FLASH_NONE = 0;
45    static final int LIGHT_FLASH_TIMED = 1;
46    static final int LIGHT_FLASH_HARDWARE = 2;
47
48    /**
49     * Light brightness is managed by a user setting.
50     */
51    static final int BRIGHTNESS_MODE_USER = 0;
52
53    /**
54     * Light brightness is managed by a light sensor.
55     */
56    static final int BRIGHTNESS_MODE_SENSOR = 1;
57
58    private final Light mLights[] = new Light[LIGHT_ID_COUNT];
59
60    public final class Light {
61
62        private Light(int id) {
63            mId = id;
64        }
65
66        public void setBrightness(int brightness) {
67            setBrightness(brightness, BRIGHTNESS_MODE_USER);
68        }
69
70        public void setBrightness(int brightness, int brightnessMode) {
71            synchronized (this) {
72                int color = brightness & 0x000000ff;
73                color = 0xff000000 | (color << 16) | (color << 8) | color;
74                setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, brightnessMode);
75            }
76        }
77
78        public void setColor(int color) {
79            synchronized (this) {
80                setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, 0);
81            }
82        }
83
84        public void setFlashing(int color, int mode, int onMS, int offMS) {
85            synchronized (this) {
86                setLightLocked(color, mode, onMS, offMS, BRIGHTNESS_MODE_USER);
87            }
88        }
89
90
91        public void pulse() {
92            pulse(0x00ffffff, 7);
93        }
94
95        public void pulse(int color, int onMS) {
96            synchronized (this) {
97                if (mColor == 0 && !mFlashing) {
98                    setLightLocked(color, LIGHT_FLASH_HARDWARE, onMS, 1000, BRIGHTNESS_MODE_USER);
99                    mH.sendMessageDelayed(Message.obtain(mH, 1, this), onMS);
100                }
101            }
102        }
103
104        public void turnOff() {
105            synchronized (this) {
106                setLightLocked(0, LIGHT_FLASH_NONE, 0, 0, 0);
107            }
108        }
109
110        private void stopFlashing() {
111            synchronized (this) {
112                setLightLocked(mColor, LIGHT_FLASH_NONE, 0, 0, BRIGHTNESS_MODE_USER);
113            }
114        }
115
116        private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode) {
117            if (color != mColor || mode != mMode || onMS != mOnMS || offMS != mOffMS) {
118                if (DEBUG) Slog.v(TAG, "setLight #" + mId + ": color=#"
119                        + Integer.toHexString(color));
120                mColor = color;
121                mMode = mode;
122                mOnMS = onMS;
123                mOffMS = offMS;
124                setLight_native(mNativePointer, mId, color, mode, onMS, offMS, brightnessMode);
125            }
126        }
127
128        private int mId;
129        private int mColor;
130        private int mMode;
131        private int mOnMS;
132        private int mOffMS;
133        private boolean mFlashing;
134    }
135
136    /* This class implements an obsolete API that was removed after eclair and re-added during the
137     * final moments of the froyo release to support flashlight apps that had been using the private
138     * IHardwareService API. This is expected to go away in the next release.
139     */
140    private final IHardwareService.Stub mLegacyFlashlightHack = new IHardwareService.Stub() {
141
142        private static final String FLASHLIGHT_FILE = "/sys/class/leds/spotlight/brightness";
143
144        public boolean getFlashlightEnabled() {
145            try {
146                FileInputStream fis = new FileInputStream(FLASHLIGHT_FILE);
147                int result = fis.read();
148                fis.close();
149                return (result != '0');
150            } catch (Exception e) {
151                return false;
152            }
153        }
154
155        public void setFlashlightEnabled(boolean on) {
156            if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.FLASHLIGHT)
157                    != PackageManager.PERMISSION_GRANTED &&
158                    mContext.checkCallingOrSelfPermission(android.Manifest.permission.HARDWARE_TEST)
159                    != PackageManager.PERMISSION_GRANTED) {
160                throw new SecurityException("Requires FLASHLIGHT or HARDWARE_TEST permission");
161            }
162            try {
163                FileOutputStream fos = new FileOutputStream(FLASHLIGHT_FILE);
164                byte[] bytes = new byte[2];
165                bytes[0] = (byte)(on ? '1' : '0');
166                bytes[1] = '\n';
167                fos.write(bytes);
168                fos.close();
169            } catch (Exception e) {
170                // fail silently
171            }
172        }
173    };
174
175    LightsService(Context context) {
176
177        mNativePointer = init_native();
178        mContext = context;
179
180        ServiceManager.addService("hardware", mLegacyFlashlightHack);
181
182        for (int i = 0; i < LIGHT_ID_COUNT; i++) {
183            mLights[i] = new Light(i);
184        }
185    }
186
187    protected void finalize() throws Throwable {
188        finalize_native(mNativePointer);
189        super.finalize();
190    }
191
192    public Light getLight(int id) {
193        return mLights[id];
194    }
195
196    private Handler mH = new Handler() {
197        @Override
198        public void handleMessage(Message msg) {
199            Light light = (Light)msg.obj;
200            light.stopFlashing();
201        }
202    };
203
204    private static native int init_native();
205    private static native void finalize_native(int ptr);
206
207    private static native void setLight_native(int ptr, int light, int color, int mode,
208            int onMS, int offMS, int brightnessMode);
209
210    private final Context mContext;
211
212    private int mNativePointer;
213}
214