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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         // Seq #37.
     56         if (mEnabled) {
     57             // Enable ARC status immediately before sending <Report Arc Initiated>.
     58             // If AVR responds with <Feature Abort>, disable ARC status again.
     59             // This is different from spec that says that turns ARC status to
     60             // "Enabled" if <Report ARC Initiated> is acknowledged and no
     61             // <Feature Abort> is received.
     62             // But implemented this way to save the time having to wait for
     63             // <Feature Abort>.
     64             setArcStatus(true);
     65             // If succeeds to send <Report ARC Initiated>, wait general timeout
     66             // to check whether there is no <Feature Abort> for <Report ARC Initiated>.
     67             mState = STATE_WAITING_TIMEOUT;
     68             addTimer(mState, HdmiConfig.TIMEOUT_MS);
     69             sendReportArcInitiated();
     70         } else {
     71             setArcStatus(false);
     72             finish();
     73         }
     74         return true;
     75     }
     76 
     77     private void sendReportArcInitiated() {
     78         HdmiCecMessage command =
     79                 HdmiCecMessageBuilder.buildReportArcInitiated(getSourceAddress(), mAvrAddress);
     80         sendCommand(command, new HdmiControlService.SendMessageCallback() {
     81             @Override
     82             public void onSendCompleted(int error) {
     83                 switch (error) {
     84                     case Constants.SEND_RESULT_SUCCESS:
     85                     case Constants.SEND_RESULT_BUSY:
     86                     case Constants.SEND_RESULT_FAILURE:
     87                         // The result of the command transmission, unless it is an obvious
     88                         // failure indicated by the target device (or lack thereof), should
     89                         // not affect the ARC status. Ignores it silently.
     90                         break;
     91                     case Constants.SEND_RESULT_NAK:
     92                         // If <Report ARC Initiated> is negatively ack'ed, disable ARC and
     93                         // send <Report ARC Terminated> directly.
     94                         setArcStatus(false);
     95                         HdmiLogger.debug("Failed to send <Report Arc Initiated>.");
     96                         finish();
     97                         break;
     98                 }
     99             }
    100         });
    101     }
    102 
    103     private void setArcStatus(boolean enabled) {
    104         boolean wasEnabled = tv().setArcStatus(enabled);
    105         Slog.i(TAG, "Change arc status [old:" + wasEnabled + ", new:" + enabled + "]");
    106 
    107         // If enabled before and set to "disabled" and send <Report Arc Terminated> to
    108         // av reciever.
    109         if (!enabled && wasEnabled) {
    110             sendCommand(HdmiCecMessageBuilder.buildReportArcTerminated(getSourceAddress(),
    111                     mAvrAddress));
    112         }
    113     }
    114 
    115     @Override
    116     boolean processCommand(HdmiCecMessage cmd) {
    117         if (mState != STATE_WAITING_TIMEOUT) {
    118             return false;
    119         }
    120 
    121         int opcode = cmd.getOpcode();
    122         if (opcode == Constants.MESSAGE_FEATURE_ABORT) {
    123             int originalOpcode = cmd.getParams()[0] & 0xFF;
    124             if (originalOpcode == Constants.MESSAGE_REPORT_ARC_INITIATED) {
    125                 HdmiLogger.debug("Feature aborted for <Report Arc Initiated>");
    126                 setArcStatus(false);
    127                 finish();
    128                 return true;
    129             }
    130         }
    131         return false;
    132     }
    133 
    134     @Override
    135     void handleTimerEvent(int state) {
    136         if (mState != state || mState != STATE_WAITING_TIMEOUT) {
    137             return;
    138         }
    139         // Expire timeout for <Feature Abort>.
    140         finish();
    141     }
    142 }
    143