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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.hardware.tv.cec.V1_0.SendMessageResult;
     21 import android.util.Slog;
     22 
     23 /**
     24  * Feature action that handles enabling/disabling of ARC transmission channel.
     25  * Once TV gets <Initiate ARC>, TV sends <Report ARC Initiated> to AV Receiver.
     26  * If it fails or it gets <Terminate ARC>, TV just disables ARC.
     27  */
     28 final class SetArcTransmissionStateAction extends HdmiCecFeatureAction {
     29     private static final String TAG = "SetArcTransmissionStateAction";
     30 
     31     // State in which the action sent <Rerpot Arc Initiated> and
     32     // is waiting for time out. If it receives <Feature Abort> within timeout
     33     // ARC should be disabled.
     34     private static final int STATE_WAITING_TIMEOUT = 1;
     35 
     36     private final boolean mEnabled;
     37     private final int mAvrAddress;
     38 
     39     /**
     40      * @Constructor
     41      *
     42      * @param source {@link HdmiCecLocalDevice} instance
     43      * @param enabled whether to enable ARC Transmission channel
     44      */
     45     SetArcTransmissionStateAction(HdmiCecLocalDevice source, int avrAddress,
     46             boolean enabled) {
     47         super(source);
     48         HdmiUtils.verifyAddressType(getSourceAddress(), HdmiDeviceInfo.DEVICE_TV);
     49         HdmiUtils.verifyAddressType(avrAddress, HdmiDeviceInfo.DEVICE_AUDIO_SYSTEM);
     50         mAvrAddress = avrAddress;
     51         mEnabled = enabled;
     52     }
     53 
     54     @Override
     55     boolean start() {
     56         // Seq #37.
     57         if (mEnabled) {
     58             // Enable ARC status immediately before sending <Report Arc Initiated>.
     59             // If AVR responds with <Feature Abort>, disable ARC status again.
     60             // This is different from spec that says that turns ARC status to
     61             // "Enabled" if <Report ARC Initiated> is acknowledged and no
     62             // <Feature Abort> is received.
     63             // But implemented this way to save the time having to wait for
     64             // <Feature Abort>.
     65             setArcStatus(true);
     66             // If succeeds to send <Report ARC Initiated>, wait general timeout
     67             // to check whether there is no <Feature Abort> for <Report ARC Initiated>.
     68             mState = STATE_WAITING_TIMEOUT;
     69             addTimer(mState, HdmiConfig.TIMEOUT_MS);
     70             sendReportArcInitiated();
     71         } else {
     72             setArcStatus(false);
     73             finish();
     74         }
     75         return true;
     76     }
     77 
     78     private void sendReportArcInitiated() {
     79         HdmiCecMessage command =
     80                 HdmiCecMessageBuilder.buildReportArcInitiated(getSourceAddress(), mAvrAddress);
     81         sendCommand(command, new HdmiControlService.SendMessageCallback() {
     82             @Override
     83             public void onSendCompleted(int error) {
     84                 switch (error) {
     85                     case SendMessageResult.SUCCESS:
     86                     case SendMessageResult.BUSY:
     87                     case SendMessageResult.FAIL:
     88                         // The result of the command transmission, unless it is an obvious
     89                         // failure indicated by the target device (or lack thereof), should
     90                         // not affect the ARC status. Ignores it silently.
     91                         break;
     92                     case SendMessageResult.NACK:
     93                         // If <Report ARC Initiated> is negatively ack'ed, disable ARC and
     94                         // send <Report ARC Terminated> directly.
     95                         setArcStatus(false);
     96                         HdmiLogger.debug("Failed to send <Report Arc Initiated>.");
     97                         finish();
     98                         break;
     99                 }
    100             }
    101         });
    102     }
    103 
    104     private void setArcStatus(boolean enabled) {
    105         boolean wasEnabled = tv().setArcStatus(enabled);
    106         Slog.i(TAG, "Change arc status [old:" + wasEnabled + ", new:" + enabled + "]");
    107 
    108         // If enabled before and set to "disabled" and send <Report Arc Terminated> to
    109         // av reciever.
    110         if (!enabled && wasEnabled) {
    111             sendCommand(HdmiCecMessageBuilder.buildReportArcTerminated(getSourceAddress(),
    112                     mAvrAddress));
    113         }
    114     }
    115 
    116     @Override
    117     boolean processCommand(HdmiCecMessage cmd) {
    118         if (mState != STATE_WAITING_TIMEOUT) {
    119             return false;
    120         }
    121 
    122         int opcode = cmd.getOpcode();
    123         if (opcode == Constants.MESSAGE_FEATURE_ABORT) {
    124             int originalOpcode = cmd.getParams()[0] & 0xFF;
    125             if (originalOpcode == Constants.MESSAGE_REPORT_ARC_INITIATED) {
    126                 HdmiLogger.debug("Feature aborted for <Report Arc Initiated>");
    127                 setArcStatus(false);
    128                 finish();
    129                 return true;
    130             }
    131         }
    132         return false;
    133     }
    134 
    135     @Override
    136     void handleTimerEvent(int state) {
    137         if (mState != state || mState != STATE_WAITING_TIMEOUT) {
    138             return;
    139         }
    140         // Expire timeout for <Feature Abort>.
    141         finish();
    142     }
    143 }
    144