DockObserver.java revision a09b4d2a611a7606e8fc8c73a24bd941b6fc173f 
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.ContentResolver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.pm.PackageManager;
23import android.media.AudioManager;
24import android.media.Ringtone;
25import android.media.RingtoneManager;
26import android.net.Uri;
27import android.os.Binder;
28import android.os.Handler;
29import android.os.Message;
30import android.os.PowerManager;
31import android.os.SystemClock;
32import android.os.UEventObserver;
33import android.os.UserHandle;
34import android.provider.Settings;
35import android.util.Log;
36import android.util.Slog;
37
38import java.io.FileDescriptor;
39import java.io.FileNotFoundException;
40import java.io.FileReader;
41import java.io.PrintWriter;
42
43/**
44 * DockObserver monitors for a docking station.
45 */
46final class DockObserver extends SystemService {
47    private static final String TAG = "DockObserver";
48
49    private static final String DOCK_UEVENT_MATCH = "DEVPATH=/devices/virtual/switch/dock";
50    private static final String DOCK_STATE_PATH = "/sys/class/switch/dock/state";
51
52    private static final int MSG_DOCK_STATE_CHANGED = 0;
53
54    private final PowerManager mPowerManager;
55    private final PowerManager.WakeLock mWakeLock;
56
57    private final Object mLock = new Object();
58
59    private boolean mSystemReady;
60
61    private int mActualDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
62
63    private int mReportedDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
64    private int mPreviousDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
65
66    private boolean mUpdatesStopped;
67
68    private final boolean mAllowTheaterModeWakeFromDock;
69
70    public DockObserver(Context context) {
71        super(context);
72
73        mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
74        mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
75        mAllowTheaterModeWakeFromDock = context.getResources().getBoolean(
76                com.android.internal.R.bool.config_allowTheaterModeWakeFromDock);
77
78        init();  // set initial status
79
80        mObserver.startObserving(DOCK_UEVENT_MATCH);
81    }
82
83    @Override
84    public void onStart() {
85        publishBinderService(TAG, new BinderService());
86    }
87
88    @Override
89    public void onBootPhase(int phase) {
90        if (phase == PHASE_ACTIVITY_MANAGER_READY) {
91            synchronized (mLock) {
92                mSystemReady = true;
93
94                // don't bother broadcasting undocked here
95                if (mReportedDockState != Intent.EXTRA_DOCK_STATE_UNDOCKED) {
96                    updateLocked();
97                }
98            }
99        }
100    }
101
102    private void init() {
103        synchronized (mLock) {
104            try {
105                char[] buffer = new char[1024];
106                FileReader file = new FileReader(DOCK_STATE_PATH);
107                try {
108                    int len = file.read(buffer, 0, 1024);
109                    setActualDockStateLocked(Integer.parseInt((new String(buffer, 0, len)).trim()));
110                    mPreviousDockState = mActualDockState;
111                } finally {
112                    file.close();
113                }
114            } catch (FileNotFoundException e) {
115                Slog.w(TAG, "This kernel does not have dock station support");
116            } catch (Exception e) {
117                Slog.e(TAG, "" , e);
118            }
119        }
120    }
121
122    private void setActualDockStateLocked(int newState) {
123        mActualDockState = newState;
124        if (!mUpdatesStopped) {
125            setDockStateLocked(newState);
126        }
127    }
128
129    private void setDockStateLocked(int newState) {
130        if (newState != mReportedDockState) {
131            mReportedDockState = newState;
132            if (mSystemReady) {
133                // Wake up immediately when docked or undocked except in theater mode.
134                if (mAllowTheaterModeWakeFromDock
135                        || Settings.Global.getInt(getContext().getContentResolver(),
136                            Settings.Global.THEATER_MODE_ON, 0) == 0) {
137                    mPowerManager.wakeUp(SystemClock.uptimeMillis(),
138                            "android.server:DOCK");
139                }
140                updateLocked();
141            }
142        }
143    }
144
145    private void updateLocked() {
146        mWakeLock.acquire();
147        mHandler.sendEmptyMessage(MSG_DOCK_STATE_CHANGED);
148    }
149
150    private void handleDockStateChange() {
151        synchronized (mLock) {
152            Slog.i(TAG, "Dock state changed from " + mPreviousDockState + " to "
153                    + mReportedDockState);
154            final int previousDockState = mPreviousDockState;
155            mPreviousDockState = mReportedDockState;
156
157            // Skip the dock intent if not yet provisioned.
158            final ContentResolver cr = getContext().getContentResolver();
159            if (Settings.Global.getInt(cr,
160                    Settings.Global.DEVICE_PROVISIONED, 0) == 0) {
161                Slog.i(TAG, "Device not provisioned, skipping dock broadcast");
162                return;
163            }
164
165            // Pack up the values and broadcast them to everyone
166            Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
167            intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
168            intent.putExtra(Intent.EXTRA_DOCK_STATE, mReportedDockState);
169
170            // Play a sound to provide feedback to confirm dock connection.
171            // Particularly useful for flaky contact pins...
172            if (Settings.Global.getInt(cr,
173                    Settings.Global.DOCK_SOUNDS_ENABLED, 1) == 1) {
174                String whichSound = null;
175                if (mReportedDockState == Intent.EXTRA_DOCK_STATE_UNDOCKED) {
176                    if ((previousDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
177                        (previousDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
178                        (previousDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
179                        whichSound = Settings.Global.DESK_UNDOCK_SOUND;
180                    } else if (previousDockState == Intent.EXTRA_DOCK_STATE_CAR) {
181                        whichSound = Settings.Global.CAR_UNDOCK_SOUND;
182                    }
183                } else {
184                    if ((mReportedDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
185                        (mReportedDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
186                        (mReportedDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
187                        whichSound = Settings.Global.DESK_DOCK_SOUND;
188                    } else if (mReportedDockState == Intent.EXTRA_DOCK_STATE_CAR) {
189                        whichSound = Settings.Global.CAR_DOCK_SOUND;
190                    }
191                }
192
193                if (whichSound != null) {
194                    final String soundPath = Settings.Global.getString(cr, whichSound);
195                    if (soundPath != null) {
196                        final Uri soundUri = Uri.parse("file://" + soundPath);
197                        if (soundUri != null) {
198                            final Ringtone sfx = RingtoneManager.getRingtone(
199                                    getContext(), soundUri);
200                            if (sfx != null) {
201                                sfx.setStreamType(AudioManager.STREAM_SYSTEM);
202                                sfx.play();
203                            }
204                        }
205                    }
206                }
207            }
208
209            // Send the dock event intent.
210            // There are many components in the system watching for this so as to
211            // adjust audio routing, screen orientation, etc.
212            getContext().sendStickyBroadcastAsUser(intent, UserHandle.ALL);
213        }
214    }
215
216    private final Handler mHandler = new Handler(true /*async*/) {
217        @Override
218        public void handleMessage(Message msg) {
219            switch (msg.what) {
220                case MSG_DOCK_STATE_CHANGED:
221                    handleDockStateChange();
222                    mWakeLock.release();
223                    break;
224            }
225        }
226    };
227
228    private final UEventObserver mObserver = new UEventObserver() {
229        @Override
230        public void onUEvent(UEventObserver.UEvent event) {
231            if (Log.isLoggable(TAG, Log.VERBOSE)) {
232                Slog.v(TAG, "Dock UEVENT: " + event.toString());
233            }
234
235            try {
236                synchronized (mLock) {
237                    setActualDockStateLocked(Integer.parseInt(event.get("SWITCH_STATE")));
238                }
239            } catch (NumberFormatException e) {
240                Slog.e(TAG, "Could not parse switch state from event " + event);
241            }
242        }
243    };
244
245    private final class BinderService extends Binder {
246        @Override
247        protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
248            if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
249                    != PackageManager.PERMISSION_GRANTED) {
250                pw.println("Permission Denial: can't dump dock observer service from from pid="
251                        + Binder.getCallingPid()
252                        + ", uid=" + Binder.getCallingUid());
253                return;
254            }
255
256            final long ident = Binder.clearCallingIdentity();
257            try {
258                synchronized (mLock) {
259                    if (args == null || args.length == 0 || "-a".equals(args[0])) {
260                        pw.println("Current Dock Observer Service state:");
261                        if (mUpdatesStopped) {
262                            pw.println("  (UPDATES STOPPED -- use 'reset' to restart)");
263                        }
264                        pw.println("  reported state: " + mReportedDockState);
265                        pw.println("  previous state: " + mPreviousDockState);
266                        pw.println("  actual state: " + mActualDockState);
267                    } else if (args.length == 3 && "set".equals(args[0])) {
268                        String key = args[1];
269                        String value = args[2];
270                        try {
271                            if ("state".equals(key)) {
272                                mUpdatesStopped = true;
273                                setDockStateLocked(Integer.parseInt(value));
274                            } else {
275                                pw.println("Unknown set option: " + key);
276                            }
277                        } catch (NumberFormatException ex) {
278                            pw.println("Bad value: " + value);
279                        }
280                    } else if (args.length == 1 && "reset".equals(args[0])) {
281                        mUpdatesStopped = false;
282                        setDockStateLocked(mActualDockState);
283                    } else {
284                        pw.println("Dump current dock state, or:");
285                        pw.println("  set state <value>");
286                        pw.println("  reset");
287                    }
288                }
289            } finally {
290                Binder.restoreCallingIdentity(ident);
291            }
292        }
293    }
294}
295