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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.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