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      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 
     17 package com.android.server;
     18 
     19 import android.content.ContentResolver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.pm.PackageManager;
     23 import android.media.AudioManager;
     24 import android.media.Ringtone;
     25 import android.media.RingtoneManager;
     26 import android.net.Uri;
     27 import android.os.Binder;
     28 import android.os.Handler;
     29 import android.os.Message;
     30 import android.os.PowerManager;
     31 import android.os.SystemClock;
     32 import android.os.UEventObserver;
     33 import android.os.UserHandle;
     34 import android.provider.Settings;
     35 import android.util.Log;
     36 import android.util.Slog;
     37 
     38 import com.android.internal.util.DumpUtils;
     39 
     40 import java.io.FileDescriptor;
     41 import java.io.FileNotFoundException;
     42 import java.io.FileReader;
     43 import java.io.PrintWriter;
     44 
     45 /**
     46  * DockObserver monitors for a docking station.
     47  */
     48 final class DockObserver extends SystemService {
     49     private static final String TAG = "DockObserver";
     50 
     51     private static final String DOCK_UEVENT_MATCH = "DEVPATH=/devices/virtual/switch/dock";
     52     private static final String DOCK_STATE_PATH = "/sys/class/switch/dock/state";
     53 
     54     private static final int MSG_DOCK_STATE_CHANGED = 0;
     55 
     56     private final PowerManager mPowerManager;
     57     private final PowerManager.WakeLock mWakeLock;
     58 
     59     private final Object mLock = new Object();
     60 
     61     private boolean mSystemReady;
     62 
     63     private int mActualDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
     64 
     65     private int mReportedDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
     66     private int mPreviousDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
     67 
     68     private boolean mUpdatesStopped;
     69 
     70     private final boolean mAllowTheaterModeWakeFromDock;
     71 
     72     public DockObserver(Context context) {
     73         super(context);
     74 
     75         mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
     76         mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
     77         mAllowTheaterModeWakeFromDock = context.getResources().getBoolean(
     78                 com.android.internal.R.bool.config_allowTheaterModeWakeFromDock);
     79 
     80         init();  // set initial status
     81 
     82         mObserver.startObserving(DOCK_UEVENT_MATCH);
     83     }
     84 
     85     @Override
     86     public void onStart() {
     87         publishBinderService(TAG, new BinderService());
     88     }
     89 
     90     @Override
     91     public void onBootPhase(int phase) {
     92         if (phase == PHASE_ACTIVITY_MANAGER_READY) {
     93             synchronized (mLock) {
     94                 mSystemReady = true;
     95 
     96                 // don't bother broadcasting undocked here
     97                 if (mReportedDockState != Intent.EXTRA_DOCK_STATE_UNDOCKED) {
     98                     updateLocked();
     99                 }
    100             }
    101         }
    102     }
    103 
    104     private void init() {
    105         synchronized (mLock) {
    106             try {
    107                 char[] buffer = new char[1024];
    108                 FileReader file = new FileReader(DOCK_STATE_PATH);
    109                 try {
    110                     int len = file.read(buffer, 0, 1024);
    111                     setActualDockStateLocked(Integer.parseInt((new String(buffer, 0, len)).trim()));
    112                     mPreviousDockState = mActualDockState;
    113                 } finally {
    114                     file.close();
    115                 }
    116             } catch (FileNotFoundException e) {
    117                 Slog.w(TAG, "This kernel does not have dock station support");
    118             } catch (Exception e) {
    119                 Slog.e(TAG, "" , e);
    120             }
    121         }
    122     }
    123 
    124     private void setActualDockStateLocked(int newState) {
    125         mActualDockState = newState;
    126         if (!mUpdatesStopped) {
    127             setDockStateLocked(newState);
    128         }
    129     }
    130 
    131     private void setDockStateLocked(int newState) {
    132         if (newState != mReportedDockState) {
    133             mReportedDockState = newState;
    134             if (mSystemReady) {
    135                 // Wake up immediately when docked or undocked except in theater mode.
    136                 if (mAllowTheaterModeWakeFromDock
    137                         || Settings.Global.getInt(getContext().getContentResolver(),
    138                             Settings.Global.THEATER_MODE_ON, 0) == 0) {
    139                     mPowerManager.wakeUp(SystemClock.uptimeMillis(),
    140                             "android.server:DOCK");
    141                 }
    142                 updateLocked();
    143             }
    144         }
    145     }
    146 
    147     private void updateLocked() {
    148         mWakeLock.acquire();
    149         mHandler.sendEmptyMessage(MSG_DOCK_STATE_CHANGED);
    150     }
    151 
    152     private void handleDockStateChange() {
    153         synchronized (mLock) {
    154             Slog.i(TAG, "Dock state changed from " + mPreviousDockState + " to "
    155                     + mReportedDockState);
    156             final int previousDockState = mPreviousDockState;
    157             mPreviousDockState = mReportedDockState;
    158 
    159             // Skip the dock intent if not yet provisioned.
    160             final ContentResolver cr = getContext().getContentResolver();
    161             if (Settings.Global.getInt(cr,
    162                     Settings.Global.DEVICE_PROVISIONED, 0) == 0) {
    163                 Slog.i(TAG, "Device not provisioned, skipping dock broadcast");
    164                 return;
    165             }
    166 
    167             // Pack up the values and broadcast them to everyone
    168             Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
    169             intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
    170             intent.putExtra(Intent.EXTRA_DOCK_STATE, mReportedDockState);
    171 
    172             boolean dockSoundsEnabled = Settings.Global.getInt(cr,
    173                     Settings.Global.DOCK_SOUNDS_ENABLED, 1) == 1;
    174             boolean dockSoundsEnabledWhenAccessibility = Settings.Global.getInt(cr,
    175                     Settings.Global.DOCK_SOUNDS_ENABLED_WHEN_ACCESSIBILITY, 1) == 1;
    176             boolean accessibilityEnabled = Settings.Secure.getInt(cr,
    177                     Settings.Secure.ACCESSIBILITY_ENABLED, 0) == 1;
    178 
    179             // Play a sound to provide feedback to confirm dock connection.
    180             // Particularly useful for flaky contact pins...
    181             if ((dockSoundsEnabled) ||
    182                    (accessibilityEnabled && dockSoundsEnabledWhenAccessibility)) {
    183                 String whichSound = null;
    184                 if (mReportedDockState == Intent.EXTRA_DOCK_STATE_UNDOCKED) {
    185                     if ((previousDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
    186                         (previousDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
    187                         (previousDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
    188                         whichSound = Settings.Global.DESK_UNDOCK_SOUND;
    189                     } else if (previousDockState == Intent.EXTRA_DOCK_STATE_CAR) {
    190                         whichSound = Settings.Global.CAR_UNDOCK_SOUND;
    191                     }
    192                 } else {
    193                     if ((mReportedDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
    194                         (mReportedDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
    195                         (mReportedDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
    196                         whichSound = Settings.Global.DESK_DOCK_SOUND;
    197                     } else if (mReportedDockState == Intent.EXTRA_DOCK_STATE_CAR) {
    198                         whichSound = Settings.Global.CAR_DOCK_SOUND;
    199                     }
    200                 }
    201 
    202                 if (whichSound != null) {
    203                     final String soundPath = Settings.Global.getString(cr, whichSound);
    204                     if (soundPath != null) {
    205                         final Uri soundUri = Uri.parse("file://" + soundPath);
    206                         if (soundUri != null) {
    207                             final Ringtone sfx = RingtoneManager.getRingtone(
    208                                     getContext(), soundUri);
    209                             if (sfx != null) {
    210                                 sfx.setStreamType(AudioManager.STREAM_SYSTEM);
    211                                 sfx.play();
    212                             }
    213                         }
    214                     }
    215                 }
    216             }
    217 
    218             // Send the dock event intent.
    219             // There are many components in the system watching for this so as to
    220             // adjust audio routing, screen orientation, etc.
    221             getContext().sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    222         }
    223     }
    224 
    225     private final Handler mHandler = new Handler(true /*async*/) {
    226         @Override
    227         public void handleMessage(Message msg) {
    228             switch (msg.what) {
    229                 case MSG_DOCK_STATE_CHANGED:
    230                     handleDockStateChange();
    231                     mWakeLock.release();
    232                     break;
    233             }
    234         }
    235     };
    236 
    237     private final UEventObserver mObserver = new UEventObserver() {
    238         @Override
    239         public void onUEvent(UEventObserver.UEvent event) {
    240             if (Log.isLoggable(TAG, Log.VERBOSE)) {
    241                 Slog.v(TAG, "Dock UEVENT: " + event.toString());
    242             }
    243 
    244             try {
    245                 synchronized (mLock) {
    246                     setActualDockStateLocked(Integer.parseInt(event.get("SWITCH_STATE")));
    247                 }
    248             } catch (NumberFormatException e) {
    249                 Slog.e(TAG, "Could not parse switch state from event " + event);
    250             }
    251         }
    252     };
    253 
    254     private final class BinderService extends Binder {
    255         @Override
    256         protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    257             if (!DumpUtils.checkDumpPermission(getContext(), TAG, pw)) return;
    258             final long ident = Binder.clearCallingIdentity();
    259             try {
    260                 synchronized (mLock) {
    261                     if (args == null || args.length == 0 || "-a".equals(args[0])) {
    262                         pw.println("Current Dock Observer Service state:");
    263                         if (mUpdatesStopped) {
    264                             pw.println("  (UPDATES STOPPED -- use 'reset' to restart)");
    265                         }
    266                         pw.println("  reported state: " + mReportedDockState);
    267                         pw.println("  previous state: " + mPreviousDockState);
    268                         pw.println("  actual state: " + mActualDockState);
    269                     } else if (args.length == 3 && "set".equals(args[0])) {
    270                         String key = args[1];
    271                         String value = args[2];
    272                         try {
    273                             if ("state".equals(key)) {
    274                                 mUpdatesStopped = true;
    275                                 setDockStateLocked(Integer.parseInt(value));
    276                             } else {
    277                                 pw.println("Unknown set option: " + key);
    278                             }
    279                         } catch (NumberFormatException ex) {
    280                             pw.println("Bad value: " + value);
    281                         }
    282                     } else if (args.length == 1 && "reset".equals(args[0])) {
    283                         mUpdatesStopped = false;
    284                         setDockStateLocked(mActualDockState);
    285                     } else {
    286                         pw.println("Dump current dock state, or:");
    287                         pw.println("  set state <value>");
    288                         pw.println("  reset");
    289                     }
    290                 }
    291             } finally {
    292                 Binder.restoreCallingIdentity(ident);
    293             }
    294         }
    295     }
    296 }
    297