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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 java.io.FileDescriptor;
     39 import java.io.FileNotFoundException;
     40 import java.io.FileReader;
     41 import java.io.PrintWriter;
     42 
     43 /**
     44  * DockObserver monitors for a docking station.
     45  */
     46 final 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     }
    206 
    207     private final Handler mHandler = new Handler(true /*async*/) {
    208         @Override
    209         public void handleMessage(Message msg) {
    210             switch (msg.what) {
    211                 case MSG_DOCK_STATE_CHANGED:
    212                     handleDockStateChange();
    213                     mWakeLock.release();
    214                     break;
    215             }
    216         }
    217     };
    218 
    219     private final UEventObserver mObserver = new UEventObserver() {
    220         @Override
    221         public void onUEvent(UEventObserver.UEvent event) {
    222             if (Log.isLoggable(TAG, Log.VERBOSE)) {
    223                 Slog.v(TAG, "Dock UEVENT: " + event.toString());
    224             }
    225 
    226             try {
    227                 synchronized (mLock) {
    228                     setActualDockStateLocked(Integer.parseInt(event.get("SWITCH_STATE")));
    229                 }
    230             } catch (NumberFormatException e) {
    231                 Slog.e(TAG, "Could not parse switch state from event " + event);
    232             }
    233         }
    234     };
    235 
    236     private final class BinderService extends Binder {
    237         @Override
    238         protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    239             if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
    240                     != PackageManager.PERMISSION_GRANTED) {
    241                 pw.println("Permission Denial: can't dump dock observer service from from pid="
    242                         + Binder.getCallingPid()
    243                         + ", uid=" + Binder.getCallingUid());
    244                 return;
    245             }
    246 
    247             final long ident = Binder.clearCallingIdentity();
    248             try {
    249                 synchronized (mLock) {
    250                     if (args == null || args.length == 0 || "-a".equals(args[0])) {
    251                         pw.println("Current Dock Observer Service state:");
    252                         if (mUpdatesStopped) {
    253                             pw.println("  (UPDATES STOPPED -- use 'reset' to restart)");
    254                         }
    255                         pw.println("  reported state: " + mReportedDockState);
    256                         pw.println("  previous state: " + mPreviousDockState);
    257                         pw.println("  actual state: " + mActualDockState);
    258                     } else if (args.length == 3 && "set".equals(args[0])) {
    259                         String key = args[1];
    260                         String value = args[2];
    261                         try {
    262                             if ("state".equals(key)) {
    263                                 mUpdatesStopped = true;
    264                                 setDockStateLocked(Integer.parseInt(value));
    265                             } else {
    266                                 pw.println("Unknown set option: " + key);
    267                             }
    268                         } catch (NumberFormatException ex) {
    269                             pw.println("Bad value: " + value);
    270                         }
    271                     } else if (args.length == 1 && "reset".equals(args[0])) {
    272                         mUpdatesStopped = false;
    273                         setDockStateLocked(mActualDockState);
    274                     } else {
    275                         pw.println("Dump current dock state, or:");
    276                         pw.println("  set state <value>");
    277                         pw.println("  reset");
    278                     }
    279                 }
    280             } finally {
    281                 Binder.restoreCallingIdentity(ident);
    282             }
    283         }
    284     }
    285 }
    286