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      1 /*
      2  * Copyright (C) 2013 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.Context;
     20 import android.content.pm.PackageManager;
     21 import android.hardware.IConsumerIrService;
     22 import android.os.PowerManager;
     23 import android.util.Slog;
     24 
     25 import java.lang.RuntimeException;
     26 
     27 public class ConsumerIrService extends IConsumerIrService.Stub {
     28     private static final String TAG = "ConsumerIrService";
     29 
     30     private static final int MAX_XMIT_TIME = 2000000; /* in microseconds */
     31 
     32     private static native boolean halOpen();
     33     private static native int halTransmit(int carrierFrequency, int[] pattern);
     34     private static native int[] halGetCarrierFrequencies();
     35 
     36     private final Context mContext;
     37     private final PowerManager.WakeLock mWakeLock;
     38     private final boolean mHasNativeHal;
     39     private final Object mHalLock = new Object();
     40 
     41     ConsumerIrService(Context context) {
     42         mContext = context;
     43         PowerManager pm = (PowerManager)context.getSystemService(
     44                 Context.POWER_SERVICE);
     45         mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
     46         mWakeLock.setReferenceCounted(true);
     47 
     48         mHasNativeHal = halOpen();
     49         if (mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CONSUMER_IR)) {
     50             if (!mHasNativeHal) {
     51                 throw new RuntimeException("FEATURE_CONSUMER_IR present, but no IR HAL loaded!");
     52             }
     53         } else if (mHasNativeHal) {
     54             throw new RuntimeException("IR HAL present, but FEATURE_CONSUMER_IR is not set!");
     55         }
     56     }
     57 
     58     @Override
     59     public boolean hasIrEmitter() {
     60         return mHasNativeHal;
     61     }
     62 
     63     private void throwIfNoIrEmitter() {
     64         if (!mHasNativeHal) {
     65             throw new UnsupportedOperationException("IR emitter not available");
     66         }
     67     }
     68 
     69 
     70     @Override
     71     public void transmit(String packageName, int carrierFrequency, int[] pattern) {
     72         if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.TRANSMIT_IR)
     73                 != PackageManager.PERMISSION_GRANTED) {
     74             throw new SecurityException("Requires TRANSMIT_IR permission");
     75         }
     76 
     77         long totalXmitTime = 0;
     78 
     79         for (int slice : pattern) {
     80             if (slice <= 0) {
     81                 throw new IllegalArgumentException("Non-positive IR slice");
     82             }
     83             totalXmitTime += slice;
     84         }
     85 
     86         if (totalXmitTime > MAX_XMIT_TIME ) {
     87             throw new IllegalArgumentException("IR pattern too long");
     88         }
     89 
     90         throwIfNoIrEmitter();
     91 
     92         // Right now there is no mechanism to ensure fair queing of IR requests
     93         synchronized (mHalLock) {
     94             int err = halTransmit(carrierFrequency, pattern);
     95 
     96             if (err < 0) {
     97                 Slog.e(TAG, "Error transmitting: " + err);
     98             }
     99         }
    100     }
    101 
    102     @Override
    103     public int[] getCarrierFrequencies() {
    104         if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.TRANSMIT_IR)
    105                 != PackageManager.PERMISSION_GRANTED) {
    106             throw new SecurityException("Requires TRANSMIT_IR permission");
    107         }
    108 
    109         throwIfNoIrEmitter();
    110 
    111         synchronized(mHalLock) {
    112             return halGetCarrierFrequencies();
    113         }
    114     }
    115 }
    116