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      1 /*
      2  * Copyright (C) 2016 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.tv;
     18 
     19 import android.os.Binder;
     20 import android.os.IBinder;
     21 
     22 import java.io.IOException;
     23 
     24 import dalvik.system.CloseGuard;
     25 
     26 /**
     27  * Sends the input event to the linux driver.
     28  */
     29 public final class UinputBridge {
     30     private final CloseGuard mCloseGuard = CloseGuard.get();
     31     private long mPtr;
     32     private IBinder mToken = null;
     33 
     34     private static native long nativeOpen(String name, String uniqueId, int width, int height,
     35                                           int maxPointers);
     36     private static native void nativeClose(long ptr);
     37     private static native void nativeClear(long ptr);
     38     private static native void nativeSendTimestamp(long ptr, long timestamp);
     39     private static native void nativeSendKey(long ptr, int keyCode, boolean down);
     40     private static native void nativeSendPointerDown(long ptr, int pointerId, int x, int y);
     41     private static native void nativeSendPointerUp(long ptr, int pointerId);
     42     private static native void nativeSendPointerSync(long ptr);
     43 
     44     public UinputBridge(IBinder token, String name, int width, int height, int maxPointers)
     45                         throws IOException {
     46         if (width < 1 || height < 1) {
     47             throw new IllegalArgumentException("Touchpad must be at least 1x1.");
     48         }
     49         if (maxPointers < 1 || maxPointers > 32) {
     50             throw new IllegalArgumentException("Touchpad must support between 1 and 32 pointers.");
     51         }
     52         if (token == null) {
     53             throw new IllegalArgumentException("Token cannot be null");
     54         }
     55         mPtr = nativeOpen(name, token.toString(), width, height, maxPointers);
     56         if (mPtr == 0) {
     57             throw new IOException("Could not open uinput device " + name);
     58         }
     59         mToken = token;
     60         mCloseGuard.open("close");
     61     }
     62 
     63     @Override
     64     protected void finalize() throws Throwable {
     65         try {
     66             if (mPtr != 0) {
     67                 mCloseGuard.warnIfOpen();
     68             }
     69             close(mToken);
     70         } finally {
     71             mToken = null;
     72             super.finalize();
     73         }
     74     }
     75 
     76     public void close(IBinder token) {
     77         if (isTokenValid(token)) {
     78             if (mPtr != 0) {
     79                 clear(token);
     80                 nativeClose(mPtr);
     81 
     82                 mPtr = 0;
     83                 mCloseGuard.close();
     84             }
     85         }
     86     }
     87 
     88     public IBinder getToken() {
     89         return mToken;
     90     }
     91 
     92     protected boolean isTokenValid(IBinder token) {
     93         return mToken.equals(token);
     94     }
     95 
     96     public void sendTimestamp(IBinder token, long timestamp) {
     97         if (isTokenValid(token)) {
     98             nativeSendTimestamp(mPtr, timestamp);
     99         }
    100     }
    101 
    102     public void sendKeyDown(IBinder token, int keyCode) {
    103         if (isTokenValid(token)) {
    104             nativeSendKey(mPtr, keyCode, true /*down*/);
    105         }
    106     }
    107 
    108     public void sendKeyUp(IBinder token, int keyCode) {
    109         if (isTokenValid(token)) {
    110             nativeSendKey(mPtr, keyCode, false /*down*/);
    111         }
    112     }
    113 
    114     public void sendPointerDown(IBinder token, int pointerId, int x, int y) {
    115         if (isTokenValid(token)) {
    116             nativeSendPointerDown(mPtr, pointerId, x, y);
    117         }
    118     }
    119 
    120     public void sendPointerUp(IBinder token, int pointerId) {
    121         if (isTokenValid(token)) {
    122             nativeSendPointerUp(mPtr, pointerId);
    123         }
    124     }
    125 
    126     public void sendPointerSync(IBinder token) {
    127         if (isTokenValid(token)) {
    128             nativeSendPointerSync(mPtr);
    129         }
    130 
    131     }
    132 
    133     public void clear(IBinder token) {
    134         if (isTokenValid(token)) {
    135             nativeClear(mPtr);
    136         }
    137     }
    138 
    139 }
    140