DockObserver.java revision 010e561a703381e16dd17caa7c942dea6978e6dc 
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    public DockObserver(Context context) {
69        super(context);
70
71        mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
72        mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
73
74        init();  // set initial status
75
76        mObserver.startObserving(DOCK_UEVENT_MATCH);
77    }
78
79    @Override
80    public void onStart() {
81        publishBinderService(TAG, new BinderService());
82    }
83
84    @Override
85    public void onBootPhase(int phase) {
86        if (phase == PHASE_ACTIVITY_MANAGER_READY) {
87            synchronized (mLock) {
88                mSystemReady = true;
89
90                // don't bother broadcasting undocked here
91                if (mReportedDockState != Intent.EXTRA_DOCK_STATE_UNDOCKED) {
92                    updateLocked();
93                }
94            }
95        }
96    }
97
98    private void init() {
99        synchronized (mLock) {
100            try {
101                char[] buffer = new char[1024];
102                FileReader file = new FileReader(DOCK_STATE_PATH);
103                try {
104                    int len = file.read(buffer, 0, 1024);
105                    setActualDockStateLocked(Integer.valueOf((new String(buffer, 0, len)).trim()));
106                    mPreviousDockState = mActualDockState;
107                } finally {
108                    file.close();
109                }
110            } catch (FileNotFoundException e) {
111                Slog.w(TAG, "This kernel does not have dock station support");
112            } catch (Exception e) {
113                Slog.e(TAG, "" , e);
114            }
115        }
116    }
117
118    private void setActualDockStateLocked(int newState) {
119        mActualDockState = newState;
120        if (!mUpdatesStopped) {
121            setDockStateLocked(newState);
122        }
123    }
124
125    private void setDockStateLocked(int newState) {
126        if (newState != mReportedDockState) {
127            mReportedDockState = newState;
128            if (mSystemReady) {
129                // Wake up immediately when docked or undocked.
130                mPowerManager.wakeUp(SystemClock.uptimeMillis());
131                updateLocked();
132            }
133        }
134    }
135
136    private void updateLocked() {
137        mWakeLock.acquire();
138        mHandler.sendEmptyMessage(MSG_DOCK_STATE_CHANGED);
139    }
140
141    private void handleDockStateChange() {
142        synchronized (mLock) {
143            Slog.i(TAG, "Dock state changed from " + mPreviousDockState + " to "
144                    + mReportedDockState);
145            final int previousDockState = mPreviousDockState;
146            mPreviousDockState = mReportedDockState;
147
148            // Skip the dock intent if not yet provisioned.
149            final ContentResolver cr = getContext().getContentResolver();
150            if (Settings.Global.getInt(cr,
151                    Settings.Global.DEVICE_PROVISIONED, 0) == 0) {
152                Slog.i(TAG, "Device not provisioned, skipping dock broadcast");
153                return;
154            }
155
156            // Pack up the values and broadcast them to everyone
157            Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
158            intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
159            intent.putExtra(Intent.EXTRA_DOCK_STATE, mReportedDockState);
160
161            // Play a sound to provide feedback to confirm dock connection.
162            // Particularly useful for flaky contact pins...
163            if (Settings.Global.getInt(cr,
164                    Settings.Global.DOCK_SOUNDS_ENABLED, 1) == 1) {
165                String whichSound = null;
166                if (mReportedDockState == Intent.EXTRA_DOCK_STATE_UNDOCKED) {
167                    if ((previousDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
168                        (previousDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
169                        (previousDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
170                        whichSound = Settings.Global.DESK_UNDOCK_SOUND;
171                    } else if (previousDockState == Intent.EXTRA_DOCK_STATE_CAR) {
172                        whichSound = Settings.Global.CAR_UNDOCK_SOUND;
173                    }
174                } else {
175                    if ((mReportedDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
176                        (mReportedDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
177                        (mReportedDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
178                        whichSound = Settings.Global.DESK_DOCK_SOUND;
179                    } else if (mReportedDockState == Intent.EXTRA_DOCK_STATE_CAR) {
180                        whichSound = Settings.Global.CAR_DOCK_SOUND;
181                    }
182                }
183
184                if (whichSound != null) {
185                    final String soundPath = Settings.Global.getString(cr, whichSound);
186                    if (soundPath != null) {
187                        final Uri soundUri = Uri.parse("file://" + soundPath);
188                        if (soundUri != null) {
189                            final Ringtone sfx = RingtoneManager.getRingtone(
190                                    getContext(), soundUri);
191                            if (sfx != null) {
192                                sfx.setStreamType(AudioManager.STREAM_SYSTEM);
193                                sfx.play();
194                            }
195                        }
196                    }
197                }
198            }
199
200            // Send the dock event intent.
201            // There are many components in the system watching for this so as to
202            // adjust audio routing, screen orientation, etc.
203            getContext().sendStickyBroadcastAsUser(intent, UserHandle.ALL);
204
205            // Release the wake lock that was acquired when the message was posted.
206            mWakeLock.release();
207        }
208    }
209
210    private final Handler mHandler = new Handler(true /*async*/) {
211        @Override
212        public void handleMessage(Message msg) {
213            switch (msg.what) {
214                case MSG_DOCK_STATE_CHANGED:
215                    handleDockStateChange();
216                    break;
217            }
218        }
219    };
220
221    private final UEventObserver mObserver = new UEventObserver() {
222        @Override
223        public void onUEvent(UEventObserver.UEvent event) {
224            if (Log.isLoggable(TAG, Log.VERBOSE)) {
225                Slog.v(TAG, "Dock UEVENT: " + event.toString());
226            }
227
228            try {
229                synchronized (mLock) {
230                    setActualDockStateLocked(Integer.parseInt(event.get("SWITCH_STATE")));
231                }
232            } catch (NumberFormatException e) {
233                Slog.e(TAG, "Could not parse switch state from event " + event);
234            }
235        }
236    };
237
238    private final class BinderService extends Binder {
239        @Override
240        protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
241            if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
242                    != PackageManager.PERMISSION_GRANTED) {
243                pw.println("Permission Denial: can't dump dock observer service from from pid="
244                        + Binder.getCallingPid()
245                        + ", uid=" + Binder.getCallingUid());
246                return;
247            }
248
249            final long ident = Binder.clearCallingIdentity();
250            try {
251                synchronized (mLock) {
252                    if (args == null || args.length == 0 || "-a".equals(args[0])) {
253                        pw.println("Current Dock Observer Service state:");
254                        if (mUpdatesStopped) {
255                            pw.println("  (UPDATES STOPPED -- use 'reset' to restart)");
256                        }
257                        pw.println("  reported state: " + mReportedDockState);
258                        pw.println("  previous state: " + mPreviousDockState);
259                        pw.println("  actual state: " + mActualDockState);
260                    } else if (args.length == 3 && "set".equals(args[0])) {
261                        String key = args[1];
262                        String value = args[2];
263                        try {
264                            if ("state".equals(key)) {
265                                mUpdatesStopped = true;
266                                setDockStateLocked(Integer.parseInt(value));
267                            } else {
268                                pw.println("Unknown set option: " + key);
269                            }
270                        } catch (NumberFormatException ex) {
271                            pw.println("Bad value: " + value);
272                        }
273                    } else if (args.length == 1 && "reset".equals(args[0])) {
274                        mUpdatesStopped = false;
275                        setDockStateLocked(mActualDockState);
276                    } else {
277                        pw.println("Dump current dock state, or:");
278                        pw.println("  set state <value>");
279                        pw.println("  reset");
280                    }
281                }
282            } finally {
283                Binder.restoreCallingIdentity(ident);
284            }
285        }
286    }
287}
288