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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.media.AudioManager;
     23 import android.media.Ringtone;
     24 import android.media.RingtoneManager;
     25 import android.net.Uri;
     26 import android.os.Handler;
     27 import android.os.Message;
     28 import android.os.PowerManager;
     29 import android.os.SystemClock;
     30 import android.os.UEventObserver;
     31 import android.os.UserHandle;
     32 import android.provider.Settings;
     33 import android.util.Log;
     34 import android.util.Slog;
     35 
     36 import java.io.FileNotFoundException;
     37 import java.io.FileReader;
     38 
     39 /**
     40  * <p>DockObserver monitors for a docking station.
     41  */
     42 final class DockObserver extends UEventObserver {
     43     private static final String TAG = DockObserver.class.getSimpleName();
     44 
     45     private static final String DOCK_UEVENT_MATCH = "DEVPATH=/devices/virtual/switch/dock";
     46     private static final String DOCK_STATE_PATH = "/sys/class/switch/dock/state";
     47 
     48     private static final int MSG_DOCK_STATE_CHANGED = 0;
     49 
     50     private final Object mLock = new Object();
     51 
     52     private int mDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
     53     private int mPreviousDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
     54 
     55     private boolean mSystemReady;
     56 
     57     private final Context mContext;
     58     private final PowerManager mPowerManager;
     59     private final PowerManager.WakeLock mWakeLock;
     60 
     61     public DockObserver(Context context) {
     62         mContext = context;
     63 
     64         mPowerManager = (PowerManager)mContext.getSystemService(Context.POWER_SERVICE);
     65         mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
     66 
     67         init();  // set initial status
     68         startObserving(DOCK_UEVENT_MATCH);
     69     }
     70 
     71     @Override
     72     public void onUEvent(UEventObserver.UEvent event) {
     73         if (Log.isLoggable(TAG, Log.VERBOSE)) {
     74             Slog.v(TAG, "Dock UEVENT: " + event.toString());
     75         }
     76 
     77         synchronized (mLock) {
     78             try {
     79                 int newState = Integer.parseInt(event.get("SWITCH_STATE"));
     80                 if (newState != mDockState) {
     81                     mPreviousDockState = mDockState;
     82                     mDockState = newState;
     83                     if (mSystemReady) {
     84                         // Wake up immediately when docked or undocked.
     85                         mPowerManager.wakeUp(SystemClock.uptimeMillis());
     86 
     87                         updateLocked();
     88                     }
     89                 }
     90             } catch (NumberFormatException e) {
     91                 Slog.e(TAG, "Could not parse switch state from event " + event);
     92             }
     93         }
     94     }
     95 
     96     private void init() {
     97         synchronized (mLock) {
     98             try {
     99                 char[] buffer = new char[1024];
    100                 FileReader file = new FileReader(DOCK_STATE_PATH);
    101                 try {
    102                     int len = file.read(buffer, 0, 1024);
    103                     mDockState = Integer.valueOf((new String(buffer, 0, len)).trim());
    104                     mPreviousDockState = mDockState;
    105                 } finally {
    106                     file.close();
    107                 }
    108             } catch (FileNotFoundException e) {
    109                 Slog.w(TAG, "This kernel does not have dock station support");
    110             } catch (Exception e) {
    111                 Slog.e(TAG, "" , e);
    112             }
    113         }
    114     }
    115 
    116     void systemReady() {
    117         synchronized (mLock) {
    118             // don't bother broadcasting undocked here
    119             if (mDockState != Intent.EXTRA_DOCK_STATE_UNDOCKED) {
    120                 updateLocked();
    121             }
    122             mSystemReady = true;
    123         }
    124     }
    125 
    126     private void updateLocked() {
    127         mWakeLock.acquire();
    128         mHandler.sendEmptyMessage(MSG_DOCK_STATE_CHANGED);
    129     }
    130 
    131     private void handleDockStateChange() {
    132         synchronized (mLock) {
    133             Slog.i(TAG, "Dock state changed: " + mDockState);
    134 
    135             // Skip the dock intent if not yet provisioned.
    136             final ContentResolver cr = mContext.getContentResolver();
    137             if (Settings.Global.getInt(cr,
    138                     Settings.Global.DEVICE_PROVISIONED, 0) == 0) {
    139                 Slog.i(TAG, "Device not provisioned, skipping dock broadcast");
    140                 return;
    141             }
    142 
    143             // Pack up the values and broadcast them to everyone
    144             Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
    145             intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
    146             intent.putExtra(Intent.EXTRA_DOCK_STATE, mDockState);
    147 
    148             // Play a sound to provide feedback to confirm dock connection.
    149             // Particularly useful for flaky contact pins...
    150             if (Settings.Global.getInt(cr,
    151                     Settings.Global.DOCK_SOUNDS_ENABLED, 1) == 1) {
    152                 String whichSound = null;
    153                 if (mDockState == Intent.EXTRA_DOCK_STATE_UNDOCKED) {
    154                     if ((mPreviousDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
    155                         (mPreviousDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
    156                         (mPreviousDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
    157                         whichSound = Settings.Global.DESK_UNDOCK_SOUND;
    158                     } else if (mPreviousDockState == Intent.EXTRA_DOCK_STATE_CAR) {
    159                         whichSound = Settings.Global.CAR_UNDOCK_SOUND;
    160                     }
    161                 } else {
    162                     if ((mDockState == Intent.EXTRA_DOCK_STATE_DESK) ||
    163                         (mDockState == Intent.EXTRA_DOCK_STATE_LE_DESK) ||
    164                         (mDockState == Intent.EXTRA_DOCK_STATE_HE_DESK)) {
    165                         whichSound = Settings.Global.DESK_DOCK_SOUND;
    166                     } else if (mDockState == Intent.EXTRA_DOCK_STATE_CAR) {
    167                         whichSound = Settings.Global.CAR_DOCK_SOUND;
    168                     }
    169                 }
    170 
    171                 if (whichSound != null) {
    172                     final String soundPath = Settings.Global.getString(cr, whichSound);
    173                     if (soundPath != null) {
    174                         final Uri soundUri = Uri.parse("file://" + soundPath);
    175                         if (soundUri != null) {
    176                             final Ringtone sfx = RingtoneManager.getRingtone(mContext, soundUri);
    177                             if (sfx != null) {
    178                                 sfx.setStreamType(AudioManager.STREAM_SYSTEM);
    179                                 sfx.play();
    180                             }
    181                         }
    182                     }
    183                 }
    184             }
    185 
    186             // Send the dock event intent.
    187             // There are many components in the system watching for this so as to
    188             // adjust audio routing, screen orientation, etc.
    189             mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    190 
    191             // Release the wake lock that was acquired when the message was posted.
    192             mWakeLock.release();
    193         }
    194     }
    195 
    196     private final Handler mHandler = new Handler(true /*async*/) {
    197         @Override
    198         public void handleMessage(Message msg) {
    199             switch (msg.what) {
    200                 case MSG_DOCK_STATE_CHANGED:
    201                     handleDockStateChange();
    202                     break;
    203             }
    204         }
    205     };
    206 }
    207