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      1 /*
      2  * Copyright (C) 2014 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.tv.settings.accessories;
     18 
     19 import android.bluetooth.BluetoothAdapter;
     20 import android.bluetooth.BluetoothDevice;
     21 import android.bluetooth.BluetoothHidHost;
     22 import android.bluetooth.BluetoothProfile;
     23 import android.content.Context;
     24 import android.hardware.input.InputManager;
     25 import android.os.Handler;
     26 import android.util.Log;
     27 
     28 /**
     29  * Manages process of pairing and connecting of input devices.
     30  */
     31 public class BluetoothInputDeviceConnector implements BluetoothDevicePairer.BluetoothConnector {
     32 
     33     public static final String TAG = "BtInputDeviceConnector";
     34 
     35     private static final boolean DEBUG = false;
     36 
     37     private static final String[] INVALID_INPUT_KEYBOARD_DEVICE_NAMES = {
     38         "gpio-keypad", "cec_keyboard", "Virtual", "athome_remote"
     39     };
     40 
     41     private BluetoothProfile.ServiceListener mServiceConnection =
     42             new BluetoothProfile.ServiceListener() {
     43 
     44         @Override
     45         public void onServiceDisconnected(int profile) {
     46             Log.w(TAG, "Service disconnected, perhaps unexpectedly");
     47             unregisterInputMethodMonitor();
     48             closeInputProfileProxy();
     49             mOpenConnectionCallback.failed();
     50         }
     51 
     52         @Override
     53         public void onServiceConnected(int profile, BluetoothProfile proxy) {
     54             if (DEBUG) {
     55                 Log.d(TAG, "Connection made to bluetooth proxy.");
     56             }
     57             mInputProxy = (BluetoothHidHost) proxy;
     58             if (mTarget != null) {
     59                 registerInputMethodMonitor();
     60                 if (DEBUG) {
     61                     Log.d(TAG, "Connecting to target: " + mTarget.getAddress());
     62                 }
     63                 // TODO need to start a timer, otherwise if the connection fails we might be
     64                 // stuck here forever
     65                 mInputProxy.connect(mTarget);
     66 
     67                 // must set PRIORITY_AUTO_CONNECT or auto-connection will not
     68                 // occur, however this setting does not appear to be sticky
     69                 // across a reboot
     70                 mInputProxy.setPriority(mTarget, BluetoothProfile.PRIORITY_AUTO_CONNECT);
     71             }
     72         }
     73     };
     74 
     75     private BluetoothHidHost mInputProxy;
     76     private boolean mInputMethodMonitorRegistered = false;
     77 
     78     private BluetoothDevice mTarget;
     79     private Context mContext;
     80     private Handler mHandler;
     81     private BluetoothDevicePairer.OpenConnectionCallback mOpenConnectionCallback;
     82 
     83     private void registerInputMethodMonitor() {
     84         InputManager inputManager = (InputManager) mContext.getSystemService(Context.INPUT_SERVICE);
     85         inputManager.registerInputDeviceListener(mInputListener, mHandler);
     86 
     87         // TO DO: The line below is a workaround for an issue in InputManager.
     88         // The manager doesn't actually registers itself with the InputService
     89         // unless we query it for input devices. We should remove this once
     90         // the problem is fixed in InputManager.
     91         // Reference bug in Frameworks: b/10415556
     92         int[] inputDevices = inputManager.getInputDeviceIds();
     93 
     94         mInputMethodMonitorRegistered = true;
     95     }
     96 
     97     private InputManager.InputDeviceListener mInputListener =
     98             new InputManager.InputDeviceListener() {
     99         @Override
    100         public void onInputDeviceRemoved(int deviceId) {
    101             // ignored
    102         }
    103 
    104         @Override
    105         public void onInputDeviceChanged(int deviceId) {
    106             // ignored
    107         }
    108 
    109         @Override
    110         public void onInputDeviceAdded(int deviceId) {
    111            if (BluetoothDevicePairer.hasValidInputDevice(mContext, new int[] {deviceId})) {
    112                onInputAdded();
    113            }
    114         }
    115     };
    116 
    117     private void onInputAdded() {
    118         unregisterInputMethodMonitor();
    119         closeInputProfileProxy();
    120         mOpenConnectionCallback.succeeded();
    121     }
    122 
    123     private void unregisterInputMethodMonitor() {
    124         if (mInputMethodMonitorRegistered) {
    125             InputManager inputManager = (InputManager) mContext.getSystemService(Context.INPUT_SERVICE);
    126             inputManager.unregisterInputDeviceListener(mInputListener);
    127             mInputMethodMonitorRegistered = false;
    128         }
    129     }
    130 
    131     private void closeInputProfileProxy() {
    132         if (mInputProxy != null) {
    133             try {
    134                 BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    135                 adapter.closeProfileProxy(BluetoothProfile.HID_HOST, mInputProxy);
    136                 mInputProxy = null;
    137             } catch (Throwable t) {
    138                 Log.w(TAG, "Error cleaning up input profile proxy", t);
    139             }
    140         }
    141     }
    142 
    143     private BluetoothInputDeviceConnector() {
    144     }
    145 
    146     public BluetoothInputDeviceConnector(Context context, BluetoothDevice target, Handler handler,
    147                                          BluetoothDevicePairer.OpenConnectionCallback callback) {
    148         mContext = context;
    149         mTarget = target;
    150         mHandler = handler;
    151         mOpenConnectionCallback = callback;
    152     }
    153 
    154     @Override
    155     public void openConnection(BluetoothAdapter adapter) {
    156         if (!adapter.getProfileProxy(mContext, mServiceConnection, BluetoothProfile.HID_HOST)) {
    157             mOpenConnectionCallback.failed();
    158         }
    159     }
    160 }
    161