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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     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.valueOf((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                 }
    139                 updateLocked();
    140             }
    141         }
    142     }
    143 
    144     private void updateLocked() {
    145         mWakeLock.acquire();
    146         mHandler.sendEmptyMessage(MSG_DOCK_STATE_CHANGED);
    147     }
    148 
    149     private void handleDockStateChange() {
    150         synchronized (mLock) {
    151             Slog.i(TAG, "Dock state changed from " + mPreviousDockState + " to "
    152                     + mReportedDockState);
    153             final int previousDockState = mPreviousDockState;
    154             mPreviousDockState = mReportedDockState;
    155 
    156             // Skip the dock intent if not yet provisioned.
    157             final ContentResolver cr = getContext().getContentResolver();
    158             if (Settings.Global.getInt(cr,
    159                     Settings.Global.DEVICE_PROVISIONED, 0) == 0) {
    160                 Slog.i(TAG, "Device not provisioned, skipping dock broadcast");
    161                 return;
    162             }
    163 
    164             // Pack up the values and broadcast them to everyone
    165             Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
    166             intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
    167             intent.putExtra(Intent.EXTRA_DOCK_STATE, mReportedDockState);
    168 
    169             // Play a sound to provide feedback to confirm dock connection.
    170             // Particularly useful for flaky contact pins...
    171             if (Settings.Global.getInt(cr,
    172                     Settings.Global.DOCK_SOUNDS_ENABLED, 1) == 1) {
    173                 String whichSound = null;
    174                 if (mReportedDockState == Intent.EXTRA_DOCK_STATE_UNDOCKED) {
    175                     if ((previousDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
    176                         (previousDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
    177                         (previousDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
    178                         whichSound = Settings.Global.DESK_UNDOCK_SOUND;
    179                     } else if (previousDockState == Intent.EXTRA_DOCK_STATE_CAR) {
    180                         whichSound = Settings.Global.CAR_UNDOCK_SOUND;
    181                     }
    182                 } else {
    183                     if ((mReportedDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
    184                         (mReportedDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
    185                         (mReportedDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
    186                         whichSound = Settings.Global.DESK_DOCK_SOUND;
    187                     } else if (mReportedDockState == Intent.EXTRA_DOCK_STATE_CAR) {
    188                         whichSound = Settings.Global.CAR_DOCK_SOUND;
    189                     }
    190                 }
    191 
    192                 if (whichSound != null) {
    193                     final String soundPath = Settings.Global.getString(cr, whichSound);
    194                     if (soundPath != null) {
    195                         final Uri soundUri = Uri.parse("file://" + soundPath);
    196                         if (soundUri != null) {
    197                             final Ringtone sfx = RingtoneManager.getRingtone(
    198                                     getContext(), soundUri);
    199                             if (sfx != null) {
    200                                 sfx.setStreamType(AudioManager.STREAM_SYSTEM);
    201                                 sfx.play();
    202                             }
    203                         }
    204                     }
    205                 }
    206             }
    207 
    208             // Send the dock event intent.
    209             // There are many components in the system watching for this so as to
    210             // adjust audio routing, screen orientation, etc.
    211             getContext().sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    212         }
    213     }
    214 
    215     private final Handler mHandler = new Handler(true /*async*/) {
    216         @Override
    217         public void handleMessage(Message msg) {
    218             switch (msg.what) {
    219                 case MSG_DOCK_STATE_CHANGED:
    220                     handleDockStateChange();
    221                     mWakeLock.release();
    222                     break;
    223             }
    224         }
    225     };
    226 
    227     private final UEventObserver mObserver = new UEventObserver() {
    228         @Override
    229         public void onUEvent(UEventObserver.UEvent event) {
    230             if (Log.isLoggable(TAG, Log.VERBOSE)) {
    231                 Slog.v(TAG, "Dock UEVENT: " + event.toString());
    232             }
    233 
    234             try {
    235                 synchronized (mLock) {
    236                     setActualDockStateLocked(Integer.parseInt(event.get("SWITCH_STATE")));
    237                 }
    238             } catch (NumberFormatException e) {
    239                 Slog.e(TAG, "Could not parse switch state from event " + event);
    240             }
    241         }
    242     };
    243 
    244     private final class BinderService extends Binder {
    245         @Override
    246         protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    247             if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
    248                     != PackageManager.PERMISSION_GRANTED) {
    249                 pw.println("Permission Denial: can't dump dock observer service from from pid="
    250                         + Binder.getCallingPid()
    251                         + ", uid=" + Binder.getCallingUid());
    252                 return;
    253             }
    254 
    255             final long ident = Binder.clearCallingIdentity();
    256             try {
    257                 synchronized (mLock) {
    258                     if (args == null || args.length == 0 || "-a".equals(args[0])) {
    259                         pw.println("Current Dock Observer Service state:");
    260                         if (mUpdatesStopped) {
    261                             pw.println("  (UPDATES STOPPED -- use 'reset' to restart)");
    262                         }
    263                         pw.println("  reported state: " + mReportedDockState);
    264                         pw.println("  previous state: " + mPreviousDockState);
    265                         pw.println("  actual state: " + mActualDockState);
    266                     } else if (args.length == 3 && "set".equals(args[0])) {
    267                         String key = args[1];
    268                         String value = args[2];
    269                         try {
    270                             if ("state".equals(key)) {
    271                                 mUpdatesStopped = true;
    272                                 setDockStateLocked(Integer.parseInt(value));
    273                             } else {
    274                                 pw.println("Unknown set option: " + key);
    275                             }
    276                         } catch (NumberFormatException ex) {
    277                             pw.println("Bad value: " + value);
    278                         }
    279                     } else if (args.length == 1 && "reset".equals(args[0])) {
    280                         mUpdatesStopped = false;
    281                         setDockStateLocked(mActualDockState);
    282                     } else {
    283                         pw.println("Dump current dock state, or:");
    284                         pw.println("  set state <value>");
    285                         pw.println("  reset");
    286                     }
    287                 }
    288             } finally {
    289                 Binder.restoreCallingIdentity(ident);
    290             }
    291         }
    292     }
    293 }
    294