/*
* Copyright (C) 2008 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;
import android.app.ActivityManagerNative;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
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 android.util.Log;
import java.io.FileReader;
import java.io.FileNotFoundException;
/**
* <p>WiredAccessoryObserver monitors for a wired headset on the main board or dock.
*/
class WiredAccessoryObserver extends UEventObserver {
private static final String TAG = WiredAccessoryObserver.class.getSimpleName();
private static final boolean LOG = true;
private static final int MAX_AUDIO_PORTS = 3; /* h2w, USB Audio & hdmi */
private static final String uEventInfo[][] = { {"DEVPATH=/devices/virtual/switch/h2w",
"/sys/class/switch/h2w/state",
"/sys/class/switch/h2w/name"},
{"DEVPATH=/devices/virtual/switch/usb_audio",
"/sys/class/switch/usb_audio/state",
"/sys/class/switch/usb_audio/name"},
{"DEVPATH=/devices/virtual/switch/hdmi",
"/sys/class/switch/hdmi/state",
"/sys/class/switch/hdmi/name"} };
private static final int BIT_HEADSET = (1 << 0);
private static final int BIT_HEADSET_NO_MIC = (1 << 1);
private static final int BIT_USB_HEADSET_ANLG = (1 << 2);
private static final int BIT_USB_HEADSET_DGTL = (1 << 3);
private static final int BIT_HDMI_AUDIO = (1 << 4);
private static final int SUPPORTED_HEADSETS = (BIT_HEADSET|BIT_HEADSET_NO_MIC|
BIT_USB_HEADSET_ANLG|BIT_USB_HEADSET_DGTL|
BIT_HDMI_AUDIO);
private static final int HEADSETS_WITH_MIC = BIT_HEADSET;
private int mHeadsetState;
private int mPrevHeadsetState;
private String mHeadsetName;
private int switchState;
private final Context mContext;
private final WakeLock mWakeLock; // held while there is a pending route change
public WiredAccessoryObserver(Context context) {
mContext = context;
PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WiredAccessoryObserver");
mWakeLock.setReferenceCounted(false);
context.registerReceiver(new BootCompletedReceiver(),
new IntentFilter(Intent.ACTION_BOOT_COMPLETED), null, null);
}
private final class BootCompletedReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// At any given time accessories could be inserted
// one on the board, one on the dock and one on HDMI:
// observe three UEVENTs
init(); // set initial status
for (int i = 0; i < MAX_AUDIO_PORTS; i++) {
startObserving(uEventInfo[i][0]);
}
}
}
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (LOG) Slog.v(TAG, "Headset UEVENT: " + event.toString());
try {
String name = event.get("SWITCH_NAME");
int state = Integer.parseInt(event.get("SWITCH_STATE"));
updateState(name, state);
} catch (NumberFormatException e) {
Slog.e(TAG, "Could not parse switch state from event " + event);
}
}
private synchronized final void updateState(String name, int state)
{
if (name.equals("usb_audio")) {
switchState = ((mHeadsetState & (BIT_HEADSET|BIT_HEADSET_NO_MIC|BIT_HDMI_AUDIO)) |
((state == 1) ? BIT_USB_HEADSET_ANLG :
((state == 2) ? BIT_USB_HEADSET_DGTL : 0)));
} else if (name.equals("hdmi")) {
switchState = ((mHeadsetState & (BIT_HEADSET|BIT_HEADSET_NO_MIC|
BIT_USB_HEADSET_DGTL|BIT_USB_HEADSET_ANLG)) |
((state == 1) ? BIT_HDMI_AUDIO : 0));
} else {
switchState = ((mHeadsetState & (BIT_HDMI_AUDIO|BIT_USB_HEADSET_ANLG|
BIT_USB_HEADSET_DGTL)) |
((state == 1) ? BIT_HEADSET :
((state == 2) ? BIT_HEADSET_NO_MIC : 0)));
}
update(name, switchState);
}
private synchronized final void init() {
char[] buffer = new char[1024];
String newName = mHeadsetName;
int newState = mHeadsetState;
mPrevHeadsetState = mHeadsetState;
if (LOG) Slog.v(TAG, "init()");
for (int i = 0; i < MAX_AUDIO_PORTS; i++) {
try {
FileReader file = new FileReader(uEventInfo[i][1]);
int len = file.read(buffer, 0, 1024);
file.close();
newState = Integer.valueOf((new String(buffer, 0, len)).trim());
file = new FileReader(uEventInfo[i][2]);
len = file.read(buffer, 0, 1024);
file.close();
newName = new String(buffer, 0, len).trim();
if (newState > 0) {
updateState(newName, newState);
}
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have wired headset support");
} catch (Exception e) {
Slog.e(TAG, "" , e);
}
}
}
private synchronized final void update(String newName, int newState) {
// Retain only relevant bits
int headsetState = newState & SUPPORTED_HEADSETS;
int newOrOld = headsetState | mHeadsetState;
int delay = 0;
int usb_headset_anlg = headsetState & BIT_USB_HEADSET_ANLG;
int usb_headset_dgtl = headsetState & BIT_USB_HEADSET_DGTL;
int h2w_headset = headsetState & (BIT_HEADSET | BIT_HEADSET_NO_MIC);
boolean h2wStateChange = true;
boolean usbStateChange = true;
// reject all suspect transitions: only accept state changes from:
// - a: 0 heaset to 1 headset
// - b: 1 headset to 0 headset
if (LOG) Slog.v(TAG, "newState = "+newState+", headsetState = "+headsetState+","
+ "mHeadsetState = "+mHeadsetState);
if (mHeadsetState == headsetState || ((h2w_headset & (h2w_headset - 1)) != 0)) {
Log.e(TAG, "unsetting h2w flag");
h2wStateChange = false;
}
// - c: 0 usb headset to 1 usb headset
// - d: 1 usb headset to 0 usb headset
if ((usb_headset_anlg >> 2) == 1 && (usb_headset_dgtl >> 3) == 1) {
Log.e(TAG, "unsetting usb flag");
usbStateChange = false;
}
if (!h2wStateChange && !usbStateChange) {
Log.e(TAG, "invalid transition, returning ...");
return;
}
mHeadsetName = newName;
mPrevHeadsetState = mHeadsetState;
mHeadsetState = headsetState;
if (headsetState == 0) {
Intent intent = new Intent(AudioManager.ACTION_AUDIO_BECOMING_NOISY);
mContext.sendBroadcast(intent);
// It can take hundreds of ms flush the audio pipeline after
// apps pause audio playback, but audio route changes are
// immediate, so delay the route change by 1000ms.
// This could be improved once the audio sub-system provides an
// interface to clear the audio pipeline.
delay = 1000;
} else {
// Insert the same delay for headset connection so that the connection event is not
// broadcast before the disconnection event in case of fast removal/insertion
if (mHandler.hasMessages(0)) {
delay = 1000;
}
}
mWakeLock.acquire();
mHandler.sendMessageDelayed(mHandler.obtainMessage(0,
mHeadsetState,
mPrevHeadsetState,
mHeadsetName),
delay);
}
private synchronized final void sendIntents(int headsetState, int prevHeadsetState, String headsetName) {
int allHeadsets = SUPPORTED_HEADSETS;
for (int curHeadset = 1; allHeadsets != 0; curHeadset <<= 1) {
if ((curHeadset & allHeadsets) != 0) {
sendIntent(curHeadset, headsetState, prevHeadsetState, headsetName);
allHeadsets &= ~curHeadset;
}
}
}
private final void sendIntent(int headset, int headsetState, int prevHeadsetState, String headsetName) {
if ((headsetState & headset) != (prevHeadsetState & headset)) {
int state = 0;
if ((headsetState & headset) != 0) {
state = 1;
}
if((headset == BIT_USB_HEADSET_ANLG) || (headset == BIT_USB_HEADSET_DGTL) ||
(headset == BIT_HDMI_AUDIO)) {
Intent intent;
// Pack up the values and broadcast them to everyone
if (headset == BIT_USB_HEADSET_ANLG) {
intent = new Intent(Intent.ACTION_USB_ANLG_HEADSET_PLUG);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
intent.putExtra("state", state);
intent.putExtra("name", headsetName);
ActivityManagerNative.broadcastStickyIntent(intent, null);
} else if (headset == BIT_USB_HEADSET_DGTL) {
intent = new Intent(Intent.ACTION_USB_DGTL_HEADSET_PLUG);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
intent.putExtra("state", state);
intent.putExtra("name", headsetName);
ActivityManagerNative.broadcastStickyIntent(intent, null);
} else if (headset == BIT_HDMI_AUDIO) {
intent = new Intent(Intent.ACTION_HDMI_AUDIO_PLUG);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
intent.putExtra("state", state);
intent.putExtra("name", headsetName);
ActivityManagerNative.broadcastStickyIntent(intent, null);
}
if (LOG) Slog.v(TAG, "Intent.ACTION_USB_HEADSET_PLUG: state: "+state+" name: "+headsetName);
// TODO: Should we require a permission?
}
if((headset == BIT_HEADSET) || (headset == BIT_HEADSET_NO_MIC)) {
// Pack up the values and broadcast them to everyone
Intent intent = new Intent(Intent.ACTION_HEADSET_PLUG);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
//int state = 0;
int microphone = 0;
if ((headset & HEADSETS_WITH_MIC) != 0) {
microphone = 1;
}
intent.putExtra("state", state);
intent.putExtra("name", headsetName);
intent.putExtra("microphone", microphone);
if (LOG) Slog.v(TAG, "Intent.ACTION_HEADSET_PLUG: state: "+state+" name: "+headsetName+" mic: "+microphone);
// 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();
}
};
}