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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.server.hdmi;
     18 
     19 import android.hardware.hdmi.HdmiDeviceInfo;
     20 import android.util.Slog;
     21 
     22 /**
     23  * Feature action that handles enabling/disabling of ARC transmission channel.
     24  * Once TV gets <Initiate ARC>, TV sends <Report ARC Initiated> to AV Receiver.
     25  * If it fails or it gets <Terminate ARC>, TV just disables ARC.
     26  */
     27 final class SetArcTransmissionStateAction extends HdmiCecFeatureAction {
     28     private static final String TAG = "SetArcTransmissionStateAction";
     29 
     30     // State in which the action sent <Rerpot Arc Initiated> and
     31     // is waiting for time out. If it receives <Feature Abort> within timeout
     32     // ARC should be disabled.
     33     private static final int STATE_WAITING_TIMEOUT = 1;
     34 
     35     private final boolean mEnabled;
     36     private final int mAvrAddress;
     37 
     38     /**
     39      * @Constructor
     40      *
     41      * @param source {@link HdmiCecLocalDevice} instance
     42      * @param enabled whether to enable ARC Transmission channel
     43      */
     44     SetArcTransmissionStateAction(HdmiCecLocalDevice source, int avrAddress,
     45             boolean enabled) {
     46         super(source);
     47         HdmiUtils.verifyAddressType(getSourceAddress(), HdmiDeviceInfo.DEVICE_TV);
     48         HdmiUtils.verifyAddressType(avrAddress, HdmiDeviceInfo.DEVICE_AUDIO_SYSTEM);
     49         mAvrAddress = avrAddress;
     50         mEnabled = enabled;
     51     }
     52 
     53     @Override
     54     boolean start() {
     55         if (mEnabled) {
     56             // Enable ARC status immediately after sending <Report Arc Initiated>.
     57             // If AVR responds with <Feature Abort>, disable ARC status again.
     58             // This is different from spec that says that turns ARC status to
     59             // "Enabled" if <Report ARC Initiated> is acknowledged and no
     60             // <Feature Abort> is received.
     61             // But implemented this way to save the time having to wait for
     62             // <Feature Abort>.
     63             setArcStatus(true);
     64             // If succeeds to send <Report ARC Initiated>, wait general timeout
     65             // to check whether there is no <Feature Abort> for <Report ARC Initiated>.
     66             mState = STATE_WAITING_TIMEOUT;
     67             addTimer(mState, HdmiConfig.TIMEOUT_MS);
     68             sendReportArcInitiated();
     69         } else {
     70             setArcStatus(false);
     71             finish();
     72         }
     73         return true;
     74     }
     75 
     76     private void sendReportArcInitiated() {
     77         HdmiCecMessage command =
     78                 HdmiCecMessageBuilder.buildReportArcInitiated(getSourceAddress(), mAvrAddress);
     79         sendCommand(command, new HdmiControlService.SendMessageCallback() {
     80             @Override
     81             public void onSendCompleted(int error) {
     82                 if (error != Constants.SEND_RESULT_SUCCESS) {
     83                     // If fails to send <Report ARC Initiated>, disable ARC and
     84                     // send <Report ARC Terminated> directly.
     85                     setArcStatus(false);
     86                     HdmiLogger.debug("Failed to send <Report Arc Initiated>.");
     87                     finish();
     88                 }
     89             }
     90         });
     91     }
     92 
     93     private void setArcStatus(boolean enabled) {
     94         boolean wasEnabled = tv().setArcStatus(enabled);
     95         Slog.i(TAG, "Change arc status [old:" + wasEnabled + ", new:" + enabled + "]");
     96 
     97         // If enabled before and set to "disabled" and send <Report Arc Terminated> to
     98         // av reciever.
     99         if (!enabled && wasEnabled) {
    100             sendCommand(HdmiCecMessageBuilder.buildReportArcTerminated(getSourceAddress(),
    101                     mAvrAddress));
    102         }
    103     }
    104 
    105     @Override
    106     boolean processCommand(HdmiCecMessage cmd) {
    107         if (mState != STATE_WAITING_TIMEOUT) {
    108             return false;
    109         }
    110 
    111         int opcode = cmd.getOpcode();
    112         if (opcode == Constants.MESSAGE_FEATURE_ABORT) {
    113             int originalOpcode = cmd.getParams()[0] & 0xFF;
    114             if (originalOpcode == Constants.MESSAGE_REPORT_ARC_INITIATED) {
    115                 HdmiLogger.debug("Feature aborted for <Report Arc Initiated>");
    116                 setArcStatus(false);
    117                 finish();
    118                 return true;
    119             }
    120         }
    121         return false;
    122     }
    123 
    124     @Override
    125     void handleTimerEvent(int state) {
    126         if (mState != state || mState != STATE_WAITING_TIMEOUT) {
    127             return;
    128         }
    129         // Expire timeout for <Feature Abort>.
    130         finish();
    131     }
    132 }
    133