/*
* 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.File;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
/**
* <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 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 static class UEventInfo {
private final String mDevName;
private final int mState1Bits;
private final int mState2Bits;
private int switchState;
public UEventInfo(String devName, int state1Bits, int state2Bits) {
mDevName = devName;
mState1Bits = state1Bits;
mState2Bits = state2Bits;
}
public String getDevName() { return mDevName; }
public String getDevPath() {
return String.format("/devices/virtual/switch/%s", mDevName);
}
public String getSwitchStatePath() {
return String.format("/sys/class/switch/%s/state", mDevName);
}
public boolean checkSwitchExists() {
File f = new File(getSwitchStatePath());
return ((null != f) && f.exists());
}
public int computeNewHeadsetState(String name, int state) {
if (LOG) Slog.v(TAG, "updateState name: " + name + " state " + 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("dock")) {
switchState = ((mHeadsetState & (BIT_HEADSET|BIT_HEADSET_NO_MIC|BIT_HDMI_AUDIO)) |
((state == 2 || state == 1) ? BIT_USB_HEADSET_ANLG : 0));
// This sets the switchsate to 4 (for USB HEADSET - BIT_USB_HEADSET_ANLG)
// Looking at the other types, maybe the state that emitted should be a 1 and at
// /devices/virtual/switch/usb_audio
//
// However the we need to deal with changes at
// /devices/virtual/switch/dock
// for the state of 2 - means that we have a USB ANLG headset Car Dock
// for the state of 1 - means that we have a USB ANLG headset Desk Dock
} 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 if (name.equals("Headset")) {
switchState = ((mHeadsetState & (BIT_HDMI_AUDIO|BIT_USB_HEADSET_ANLG|
BIT_USB_HEADSET_DGTL)) |
(state & (BIT_HEADSET|BIT_HEADSET_NO_MIC)));
} 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)));
}
if (LOG) Slog.v(TAG, "updateState switchState: " + switchState);
return switchState;
}
}
private static List<UEventInfo> makeObservedUEventList() {
List<UEventInfo> retVal = new ArrayList<UEventInfo>();
UEventInfo uei;
// Monitor h2w
uei = new UEventInfo("h2w", BIT_HEADSET, BIT_HEADSET_NO_MIC);
if (uei.checkSwitchExists()) {
retVal.add(uei);
} else {
Slog.w(TAG, "This kernel does not have wired headset support");
}
// Monitor USB
uei = new UEventInfo("usb_audio", BIT_USB_HEADSET_ANLG, BIT_USB_HEADSET_DGTL);
if (uei.checkSwitchExists()) {
retVal.add(uei);
} else {
Slog.w(TAG, "This kernel does not have usb audio support");
}
// Monitor HDMI
//
// If the kernel has support for the "hdmi_audio" switch, use that. It will be signalled
// only when the HDMI driver has a video mode configured, and the downstream sink indicates
// support for audio in its EDID.
//
// If the kernel does not have an "hdmi_audio" switch, just fall back on the older "hdmi"
// switch instead.
uei = new UEventInfo("hdmi_audio", BIT_HDMI_AUDIO, 0);
if (uei.checkSwitchExists()) {
retVal.add(uei);
} else {
uei = new UEventInfo("hdmi", BIT_HDMI_AUDIO, 0);
if (uei.checkSwitchExists()) {
retVal.add(uei);
} else {
Slog.w(TAG, "This kernel does not have HDMI audio support");
}
}
return retVal;
}
private static List<UEventInfo> uEventInfo = makeObservedUEventList();
private static int mHeadsetState;
private int mPrevHeadsetState;
private String mHeadsetName;
private final Context mContext;
private final WakeLock mWakeLock; // held while there is a pending route change
private final AudioManager mAudioManager;
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);
mAudioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
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 < uEventInfo.size(); ++i) {
UEventInfo uei = uEventInfo.get(i);
startObserving("DEVPATH="+uei.getDevPath());
}
}
}
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (LOG) Slog.v(TAG, "Headset UEVENT: " + event.toString());
try {
String devPath = event.get("DEVPATH");
String name = event.get("SWITCH_NAME");
int state = Integer.parseInt(event.get("SWITCH_STATE"));
updateState(devPath, name, state);
} catch (NumberFormatException e) {
Slog.e(TAG, "Could not parse switch state from event " + event);
}
}
private synchronized final void updateState(String devPath, String name, int state)
{
for (int i = 0; i < uEventInfo.size(); ++i) {
UEventInfo uei = uEventInfo.get(i);
if (devPath.equals(uei.getDevPath())) {
update(name, uei.computeNewHeadsetState(name, state));
return;
}
}
}
private synchronized final void init() {
char[] buffer = new char[1024];
mPrevHeadsetState = mHeadsetState;
if (LOG) Slog.v(TAG, "init()");
for (int i = 0; i < uEventInfo.size(); ++i) {
UEventInfo uei = uEventInfo.get(i);
try {
int curState;
FileReader file = new FileReader(uei.getSwitchStatePath());
int len = file.read(buffer, 0, 1024);
file.close();
curState = Integer.valueOf((new String(buffer, 0, len)).trim());
if (curState > 0) {
updateState(uei.getDevPath(), uei.getDevName(), curState);
}
} catch (FileNotFoundException e) {
Slog.w(TAG, uei.getSwitchStatePath() +
" not found while attempting to determine initial switch state");
} 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;
mWakeLock.acquire();
mHandler.sendMessage(mHandler.obtainMessage(0,
mHeadsetState,
mPrevHeadsetState,
mHeadsetName));
}
private synchronized final void setDevicesState(int headsetState,
int prevHeadsetState,
String headsetName) {
int allHeadsets = SUPPORTED_HEADSETS;
for (int curHeadset = 1; allHeadsets != 0; curHeadset <<= 1) {
if ((curHeadset & allHeadsets) != 0) {
setDeviceState(curHeadset, headsetState, prevHeadsetState, headsetName);
allHeadsets &= ~curHeadset;
}
}
}
private final void setDeviceState(int headset,
int headsetState,
int prevHeadsetState,
String headsetName) {
if ((headsetState & headset) != (prevHeadsetState & headset)) {
int device;
int state;
if ((headsetState & headset) != 0) {
state = 1;
} else {
state = 0;
}
if (headset == BIT_HEADSET) {
device = AudioManager.DEVICE_OUT_WIRED_HEADSET;
} else if (headset == BIT_HEADSET_NO_MIC){
device = AudioManager.DEVICE_OUT_WIRED_HEADPHONE;
} else if (headset == BIT_USB_HEADSET_ANLG) {
device = AudioManager.DEVICE_OUT_ANLG_DOCK_HEADSET;
} else if (headset == BIT_USB_HEADSET_DGTL) {
device = AudioManager.DEVICE_OUT_DGTL_DOCK_HEADSET;
} else if (headset == BIT_HDMI_AUDIO) {
device = AudioManager.DEVICE_OUT_AUX_DIGITAL;
} else {
Slog.e(TAG, "setDeviceState() invalid headset type: "+headset);
return;
}
if (LOG)
Slog.v(TAG, "device "+headsetName+((state == 1) ? " connected" : " disconnected"));
mAudioManager.setWiredDeviceConnectionState(device, state, headsetName);
}
}
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
setDevicesState(msg.arg1, msg.arg2, (String)msg.obj);
mWakeLock.release();
}
};
}