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/* HDMIObserver.java
*
* Copyright 2009-2011 Texas Instruments
*
* 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;
import android.app.ActivityManagerNative;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.os.UEventObserver;
import android.util.Slog;
import android.media.AudioManager;
import java.io.FileReader;
import java.io.FileNotFoundException;
/**
* <p>HDMIObserver monitors for HDMI connection.
* @hide
*/
class HDMIObserver extends UEventObserver {
private static final String TAG = HDMIObserver.class.getSimpleName();
private static final boolean LOG = true;
private static final String HDMI_UEVENT_MATCH = "DEVPATH=/devices/omapdss/display1";
private static final String HDMIName = "hdmi";
private static final String HDMI_STATE_PATH = "/sys/devices/platform/omapdss/display1/enabled";
private int mHDMIState;
private int mPrevHDMIState;
private String mHDMIName;
private final Context mContext;
private final WakeLock mWakeLock; // held while there is a pending route change
private static final String ACTION_HDMI_PLUG = "android.intent.action.HDMI_PLUG";
public HDMIObserver(Context context) {
mContext = context;
PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "HDMIObserver");
mWakeLock.setReferenceCounted(false);
startObserving(HDMI_UEVENT_MATCH);
init(); // set initial status
}
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (LOG) Slog.v(TAG, "HDMI UEVENT: " + event.toString());
try {
String action = event.get("ACTION");
int state;
if (action.equals("add")) {
state = 1;
} else if (action.equals("remove")) {
state = 0;
} else {
Slog.e(TAG, "Unknown HDMI UEvent action: " + action);
state = mHDMIState;
}
update(HDMIName, state);
} catch (NumberFormatException e) {
Slog.e(TAG, "Could not parse switch state from event " + event);
}
}
private synchronized final void init() {
// it's safe to set initial state to unplugged
// we'll receive uevent if we boot-up with cable inserted
mHDMIState = 0;
mPrevHDMIState = mHDMIState;
int newState = mHDMIState;
char[] buffer = new char[1024];
try {
FileReader file = new FileReader(HDMI_STATE_PATH);
int len = file.read(buffer, 0, 1024);
newState = Integer.valueOf((new String(buffer, 0, len)).trim());
update(HDMIName, newState);
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have hdmi support");
} catch (Exception e) {
Slog.e(TAG, "" , e);
}
}
private synchronized final void update(String newName, int newState) {
// Retain only relevant bits
int HDMIState = newState;
int newOrOld = HDMIState | mHDMIState;
int delay = 0;
if (((newOrOld & (newOrOld - 1)) != 0)) {
return;
}
mHDMIName = newName;
mPrevHDMIState = mHDMIState;
mHDMIState = HDMIState;
mWakeLock.acquire();
mHandler.sendMessageDelayed(mHandler.obtainMessage(0,
mHDMIState,
mPrevHDMIState,
mHDMIName),
delay);
}
private synchronized final void sendIntents(int HDMIState, int prevHDMIState, String HDMIName) {
int curHDMI = 1;
int allHDMI = 1;
sendIntent(curHDMI, HDMIState, prevHDMIState, HDMIName);
}
private final void sendIntent(int HDMI, int HDMIState, int prevHDMIState, String HDMIName) {
if ((HDMIState & HDMI) != (prevHDMIState & HDMI)) {
// Pack up the values and broadcast them to everyone
Intent intent = new Intent(ACTION_HDMI_PLUG);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
int state = 0;
if ((HDMIState & HDMI) != 0) {
state = 1;
}
intent.putExtra("state", state);
intent.putExtra("name", HDMIName);
if (LOG) Slog.e(TAG, "ACTION_HDMI_PLUG: state: "+state+" name: "+HDMIName);
// TODO: Should we require a permission?
ActivityManagerNative.broadcastStickyIntent(intent, null);
}
}
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
sendIntents(msg.arg1, msg.arg2, (String)msg.obj);
mWakeLock.release();
}
};
}
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