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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.hdmi;
import android.hardware.hdmi.HdmiDeviceInfo;
import android.hardware.hdmi.HdmiControlManager;
import android.hardware.hdmi.HdmiTvClient;
import android.hardware.hdmi.IHdmiControlCallback;
import android.os.RemoteException;
import android.util.Slog;
import com.android.server.hdmi.HdmiControlService.SendMessageCallback;
/**
* Handles an action that selects a logical device as a new active source.
*
* Triggered by {@link HdmiTvClient}, attempts to select the given target device
* for a new active source. It does its best to wake up the target in standby mode
* before issuing the command >Set Stream path<.
*/
final class DeviceSelectAction extends HdmiCecFeatureAction {
private static final String TAG = "DeviceSelect";
// Time in milliseconds we wait for the device power status to switch to 'Standby'
private static final int TIMEOUT_TRANSIT_TO_STANDBY_MS = 5 * 1000;
// Time in milliseconds we wait for the device power status to turn to 'On'.
private static final int TIMEOUT_POWER_ON_MS = 5 * 1000;
// The number of times we try to wake up the target device before we give up
// and just send <Set Stream Path>.
private static final int LOOP_COUNTER_MAX = 20;
// State in which we wait for <Report Power Status> to come in response to the command
// <Give Device Power Status> we have sent.
private static final int STATE_WAIT_FOR_REPORT_POWER_STATUS = 1;
// State in which we wait for the device power status to switch to 'Standby'.
// We wait till the status becomes 'Standby' before we send <Set Stream Path>
// to wake up the device again.
private static final int STATE_WAIT_FOR_DEVICE_TO_TRANSIT_TO_STANDBY = 2;
// State in which we wait for the device power status to switch to 'on'. We wait
// maximum 100 seconds (20 * 5) before we give up and just send <Set Stream Path>.
private static final int STATE_WAIT_FOR_DEVICE_POWER_ON = 3;
private final HdmiDeviceInfo mTarget;
private final IHdmiControlCallback mCallback;
private final HdmiCecMessage mGivePowerStatus;
private int mPowerStatusCounter = 0;
/**
* Constructor.
*
* @param source {@link HdmiCecLocalDevice} instance
* @param target target logical device that will be a new active source
* @param callback callback object
*/
public DeviceSelectAction(HdmiCecLocalDeviceTv source,
HdmiDeviceInfo target, IHdmiControlCallback callback) {
super(source);
mCallback = callback;
mTarget = target;
mGivePowerStatus = HdmiCecMessageBuilder.buildGiveDevicePowerStatus(
getSourceAddress(), getTargetAddress());
}
int getTargetAddress() {
return mTarget.getLogicalAddress();
}
@Override
public boolean start() {
// Seq #9
queryDevicePowerStatus();
return true;
}
private void queryDevicePowerStatus() {
sendCommand(mGivePowerStatus, new SendMessageCallback() {
@Override
public void onSendCompleted(int error) {
if (error == Constants.SEND_RESULT_NAK) {
invokeCallback(HdmiControlManager.RESULT_COMMUNICATION_FAILED);
finish();
return;
}
}
});
mState = STATE_WAIT_FOR_REPORT_POWER_STATUS;
addTimer(mState, HdmiConfig.TIMEOUT_MS);
}
@Override
public boolean processCommand(HdmiCecMessage cmd) {
if (cmd.getSource() != getTargetAddress()) {
return false;
}
int opcode = cmd.getOpcode();
byte[] params = cmd.getParams();
switch (mState) {
case STATE_WAIT_FOR_REPORT_POWER_STATUS:
if (opcode == Constants.MESSAGE_REPORT_POWER_STATUS) {
return handleReportPowerStatus(params[0]);
}
return false;
default:
break;
}
return false;
}
private boolean handleReportPowerStatus(int powerStatus) {
switch (powerStatus) {
case HdmiControlManager.POWER_STATUS_ON:
sendSetStreamPath();
return true;
case HdmiControlManager.POWER_STATUS_TRANSIENT_TO_STANDBY:
if (mPowerStatusCounter < 4) {
mState = STATE_WAIT_FOR_DEVICE_TO_TRANSIT_TO_STANDBY;
addTimer(mState, TIMEOUT_TRANSIT_TO_STANDBY_MS);
} else {
sendSetStreamPath();
}
return true;
case HdmiControlManager.POWER_STATUS_STANDBY:
if (mPowerStatusCounter == 0) {
turnOnDevice();
} else {
sendSetStreamPath();
}
return true;
case HdmiControlManager.POWER_STATUS_TRANSIENT_TO_ON:
if (mPowerStatusCounter < LOOP_COUNTER_MAX) {
mState = STATE_WAIT_FOR_DEVICE_POWER_ON;
addTimer(mState, TIMEOUT_POWER_ON_MS);
} else {
sendSetStreamPath();
}
return true;
}
return false;
}
private void turnOnDevice() {
sendUserControlPressedAndReleased(mTarget.getLogicalAddress(),
HdmiCecKeycode.CEC_KEYCODE_POWER);
sendUserControlPressedAndReleased(mTarget.getLogicalAddress(),
HdmiCecKeycode.CEC_KEYCODE_POWER_ON_FUNCTION);
mState = STATE_WAIT_FOR_DEVICE_POWER_ON;
addTimer(mState, TIMEOUT_POWER_ON_MS);
}
private void sendSetStreamPath() {
sendCommand(HdmiCecMessageBuilder.buildSetStreamPath(
getSourceAddress(), mTarget.getPhysicalAddress()));
invokeCallback(HdmiControlManager.RESULT_SUCCESS);
finish();
}
@Override
public void handleTimerEvent(int timeoutState) {
if (mState != timeoutState) {
Slog.w(TAG, "Timer in a wrong state. Ignored.");
return;
}
switch (mState) {
case STATE_WAIT_FOR_REPORT_POWER_STATUS:
if (tv().isPowerStandbyOrTransient()) {
invokeCallback(HdmiControlManager.RESULT_INCORRECT_MODE);
finish();
return;
}
sendSetStreamPath();
break;
case STATE_WAIT_FOR_DEVICE_TO_TRANSIT_TO_STANDBY:
case STATE_WAIT_FOR_DEVICE_POWER_ON:
mPowerStatusCounter++;
queryDevicePowerStatus();
break;
}
}
private void invokeCallback(int result) {
if (mCallback == null) {
return;
}
try {
mCallback.onComplete(result);
} catch (RemoteException e) {
Slog.e(TAG, "Callback failed:" + e);
}
}
}
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