android 耳机插拔流程
SystemServer.java中：
private void startOtherServices() {
// ...
traceBeginAndSlog("StartWiredAccessoryManager");
try {
// Listen for wired headset changes
inputManager.setWiredAccessoryCallbacks(
new WiredAccessoryManager(context, inputManager));//设置WiredAccessoryCallbacks
} catch (Throwable e) {
reportWtf("starting WiredAccessoryManager", e);
}
// ...
final InputManagerService inputManagerF = inputManager;
// ...
try {
// TODO(BT) Pass parameter to input manager
if (inputManagerF != null) inputManagerF.systemRunning();//调用systemRunning，这里先记下，下面会看到用途
} catch (Throwable e) {
reportWtf("Notifying InputManagerService running", e);
}
}先看WiredAccessoryManager对象的创建过程：
WiredAccessoryManager.java中：
构造函数：
public WiredAccessoryManager(Context context, InputManagerService inputManager) {
mContext = context;
PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WiredAccessoryManager");
mWakeLock.setReferenceCounted(false);
mAudioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
mInputManager = inputManager;
mUseDevInputEventForAudioJack =
context.getResources().getBoolean(R.bool.config_useDevInputEventForAudioJack);//这里在config文件中配置，这里为false。
mObserver = new WiredAccessoryObserver();//创建WiredAccessoryObserver对象
IntentFilter filter = new IntentFilter(Intent.ACTION_BOOT_COMPLETED);//并且添加了开机广播接收
filter.addAction("android.intent.action.LAUNCH_POWEROFF_ALARM");
}看下接收开机广播干嘛：但是发现并没有相关处理。
那么看下WiredAccessoryObserver()创建时干了什么：
WiredAccessoryObserver是WiredAccessoryManager的内部类
public WiredAccessoryObserver() {
mUEventInfo = makeObservedUEventList();//继续往下看
}
private List<UEventInfo> makeObservedUEventList() { //看起来就是用来获取要监听的UEvent
List<UEventInfo> retVal = new ArrayList<UEventInfo>();
UEventInfo uei;
// Monitor h2w
if (!mUseDevInputEventForAudioJack) {//这里是配置的mUseDevInputEventForAudioJack是false，所以监听h2w的UEvent事件了，如果是true，就不监听h2w的UEvent事件了。
uei = new UEventInfo(NAME_H2W, BIT_HEADSET, BIT_HEADSET_NO_MIC, BIT_LINEOUT);//这里就是一些耳机类型。其对应的UEvent信息创建在UEventInfo中。
if (uei.checkSwitchExists()) {
retVal.add(uei);
} else {
Slog.w(TAG, "This kernel does not have wired headset support");
}
}
// Monitor USB
uei = new UEventInfo(NAME_USB_AUDIO, BIT_USB_HEADSET_ANLG, BIT_USB_HEADSET_DGTL, 0);
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(NAME_HDMI_AUDIO, BIT_HDMI_AUDIO, 0, 0);
if (uei.checkSwitchExists()) {
retVal.add(uei);
} else {
uei = new UEventInfo(NAME_HDMI, BIT_HDMI_AUDIO, 0, 0);
if (uei.checkSwitchExists()) {
retVal.add(uei);
} else {
Slog.w(TAG, "This kernel does not have HDMI audio support");
}
}
return retVal;
}下面看下UEventInfo：也是WiredAccessoryManager的内部类，里面指出了监听的节点。getDevPath()与getSwitchStatePath()。
private final class UEventInfo {
private final String mDevName;
private final int mState1Bits;
private final int mState2Bits;
private final int mStateNbits;
public UEventInfo(String devName, int state1Bits, int state2Bits, int stateNbits) {
mDevName = devName;
mState1Bits = state1Bits;
mState2Bits = state2Bits;
mStateNbits = stateNbits;
}
public String getDevName() { return mDevName; }
public String getDevPath() {
return String.format(Locale.US, "/devices/virtual/switch/%s", mDevName);
}
public String getSwitchStatePath() {
return String.format(Locale.US, "/sys/class/switch/%s/state", mDevName);//UEvent事件状态切换信息保存在该节点中。
}
public boolean checkSwitchExists() {
File f = new File(getSwitchStatePath());
return f.exists();
}
public int computeNewHeadsetState(int headsetState, int switchState) {//UEvent事件触发时执行，修改音频设置参数。
int preserveMask = ~(mState1Bits | mState2Bits | mStateNbits);
int setBits = ((switchState == 1) ? mState1Bits :
((switchState == 2) ? mState2Bits :
((switchState == mStateNbits) ? mStateNbits : 0)));
if (switchState == 3) {
num_hs_pole = "num_hs_pole=5";//这里参数代表的含义是什么？
setBits = mState1Bits;
} else if (switchState == 1) {
num_hs_pole = "num_hs_pole=4";//这里参数代表的含义是什么？
} else {
num_hs_pole = "NA";
}
return ((headsetState & preserveMask) | setBits);
}
}
}现在这个WiredAccessoryObserver是创建了，那它是什么启动监听的呢？
我们已经看完了WiredAccessoryManager对象的创建过程
再看setWiredAccessoryCallbacks过程，看看是不是在这个过程中启动的监听：
在InputManagerService.java中：
public void setWiredAccessoryCallbacks(WiredAccessoryCallbacks callbacks) {
mWiredAccessoryCallbacks = callbacks;//就是这么一句，仅仅是赋个值。那就看下mWiredAccessoryCallbacks用到了哪里？
}搜了一下：
第一处：
// Native callback.
//这里是一个private的方法，外部是没法调用的，在类中也没有调用该方法的地方，那这个Native callback是什么意思？native层可以回调到这个方法？
private void notifySwitch(long whenNanos, int switchValues, int switchMask) {
if (DEBUG) {
Slog.d(TAG, "notifySwitch: values=" + Integer.toHexString(switchValues)
+ ", mask=" + Integer.toHexString(switchMask));
}
Log.d("qdd", "notifySwitch: values=" + Integer.toHexString(switchValues)
+ ", mask=" + Integer.toHexString(switchMask));
if ((switchMask & SW_LID_BIT) != 0) {
final boolean lidOpen = ((switchValues & SW_LID_BIT) == 0);
mWindowManagerCallbacks.notifyLidSwitchChanged(whenNanos, lidOpen);
}
if ((switchMask & SW_CAMERA_LENS_COVER_BIT) != 0) {
final boolean lensCovered = ((switchValues & SW_CAMERA_LENS_COVER_BIT) != 0);
mWindowManagerCallbacks.notifyCameraLensCoverSwitchChanged(whenNanos, lensCovered);
}
if (mUseDevInputEventForAudioJack && (switchMask & SW_JACK_BITS) != 0) {
Log.d("qdd", "notifySwitch: notifyWiredAccessoryChanged");
//这里回调notifyWiredAccessoryChanged方法，进去看下这个方法是干嘛的？是处理耳机状态改变的。而且config中配置mUseDevInputEventForAudioJack为false。
mWiredAccessoryCallbacks.notifyWiredAccessoryChanged(whenNanos, switchValues,switchMask);
}
if ((switchMask & SW_TABLET_MODE_BIT) != 0) {
SomeArgs args = SomeArgs.obtain();
args.argi1 = (int) (whenNanos & 0xFFFFFFFF);
args.argi2 = (int) (whenNanos >> 32);
args.arg1 = Boolean.valueOf((switchValues & SW_TABLET_MODE_BIT) != 0);
mHandler.obtainMessage(MSG_DELIVER_TABLET_MODE_CHANGED,args).sendToTarget();
}
}第二处：
public void systemRunning() {//这个就是上面systemserver中设置完WiredAccessoryCallbacks后调用的。
if (DEBUG) {
Slog.d(TAG, "System ready.");
}
mNotificationManager = (NotificationManager)mContext.getSystemService(Context.NOTIFICATION_SERVICE);
mSystemReady = true;
IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
filter.addAction(Intent.ACTION_PACKAGE_REPLACED);
filter.addDataScheme("package");
mContext.registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
updateKeyboardLayouts();
}
}, filter, null, mHandler);
filter = new IntentFilter(BluetoothDevice.ACTION_ALIAS_CHANGED);
mContext.registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
reloadDeviceAliases();
}
}, filter, null, mHandler);
mHandler.sendEmptyMessage(MSG_RELOAD_DEVICE_ALIASES);
mHandler.sendEmptyMessage(MSG_UPDATE_KEYBOARD_LAYOUTS);
if (mWiredAccessoryCallbacks != null) {
mWiredAccessoryCallbacks.systemReady();//调用systemReady()方法；继续看下干嘛的？
}
///M:[ALPS01762006]Delay the keyboard change notification until NotificationBar is ready @{
synchronized (mInputDevicesLock) {
if (!mPendingMessages.isEmpty()) {
Slog.d(TAG, "Input Manager has " + mPendingMessages.size() + " pending messages");
for (int i = 0 ; i < mPendingMessages.size() ; i++) {
mPendingMessages.get(i).sendToTarget();
}
mPendingMessages.clear();
}
}
/// @}
}WiredAccessoryManager.java中：
@Override
public void systemReady() {
synchronized (mLock) {
mWakeLock.acquire();
Log.d("qdd","systemReady --- sendmessage ---MSG_SYSTEM_READY");
Message msg = mHandler.obtainMessage(MSG_SYSTEM_READY, 0, 0, null);//发送消息，继续跟
mHandler.sendMessage(msg);
}
}
private final Handler mHandler = new Handler(Looper.myLooper(), null, true) {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_NEW_DEVICE_STATE:
Log.d("qdd","wiredAccessoryManager --- mHandler -- MSG_NEW_DEVICE_STATE --->setDevicesState : arg1 = " + msg.arg1 + ";arg2 = " + msg.arg2 + ";obj = " + (String)msg.obj);
setDevicesState(msg.arg1, msg.arg2, (String)msg.obj);
mWakeLock.release();
break;
case MSG_SYSTEM_READY:
Log.d("qdd","wiredAccessoryManager --- mHandler -- MSG_SYSTEM_READY --->onSystemReady");
onSystemReady();//再继续跟
mWakeLock.release();
break;
}
}
};
private void onSystemReady() {
if (mUseDevInputEventForAudioJack) {//config中配置这里为false。
int switchValues = 0;
if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_HEADPHONE_INSERT) == 1) {
switchValues |= SW_HEADPHONE_INSERT_BIT;
}
if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_MICROPHONE_INSERT) == 1) {
switchValues |= SW_MICROPHONE_INSERT_BIT;
}
if (mInputManager.getSwitchState(-1, InputDevice.SOURCE_ANY, SW_LINEOUT_INSERT) == 1) {
switchValues |= SW_LINEOUT_INSERT_BIT;
}
Log.d("qdd","wiredAccessoryManager --- onSystemReady --> notifyWiredAccessoryChanged switchValues = " + switchValues);
notifyWiredAccessoryChanged(0, switchValues,SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT | SW_LINEOUT_INSERT_BIT);
}
Log.d("qdd","wiredAccessoryManager --- onSystemReady --> mObserver.init()");
mObserver.init();//很好，这里看到mObserver了，跟下去。
}
void init() {
synchronized (mLock) {
if (LOG) Slog.v(TAG, "init()");
char[] buffer = new char[1024];
for (int i = 0; i < mUEventInfo.size(); ++i) {
UEventInfo uei = mUEventInfo.get(i);
try {
int curState;
FileReader file = new FileReader(uei.getSwitchStatePath());
int len = file.read(buffer, 0, 1024);
file.close();
curState = Integer.parseInt((new String(buffer, 0, len)).trim());
if (curState > 0) {
Log.d("qdd","wiredAccessoryManager --- WiredAccessoryObserver -- init -->updateStateLocked");
updateStateLocked(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);
}
}
}
// At any given time accessories could be inserted
// one on the board, one on the dock and one on HDMI:
// observe three UEVENTs
for (int i = 0; i < mUEventInfo.size(); ++i) {
UEventInfo uei = mUEventInfo.get(i);
startObserving("DEVPATH="+uei.getDevPath());//是的，有了，这里就是开始监听耳机的UEvent事件了。
}
}开启监听的过程就这样理清了，接下来看下监听是怎么处理的：
WiredAccessoryObserver中的回调方法：
@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"));//获取切换的状态
synchronized (mLock) {
Log.d("qdd","wiredAccessoryManager --- onUEvent -->updateStateLocked");
updateStateLocked(devPath, name, state);//更新状态，跟进去看下怎么处理的
}
} catch (NumberFormatException e) {
Slog.e(TAG, "Could not parse switch state from event " + event);
}
}
private void updateStateLocked(String devPath, String name, int state) {
for (int i = 0; i < mUEventInfo.size(); ++i) {
UEventInfo uei = mUEventInfo.get(i);
Log.d("qdd","wiredAccessoryManager --- updateStateLocked : devPath = " + devPath + " ; uei.getDevPath() = " + uei.getDevPath() + " ; ---> updateLocked");
if (devPath.equals(uei.getDevPath())) {
updateLocked(name, uei.computeNewHeadsetState(mHeadsetState, state));//继续跟
return;
}
}
}
/**
* Compare the existing headset state with the new state and pass along accordingly. Note
* that this only supports a single headset at a time. Inserting both a usb and jacked headset
* results in support for the last one plugged in. Similarly, unplugging either is seen as
* unplugging all.
*
* @param newName One of the NAME_xxx variables defined above.
* @param newState 0 or one of the BIT_xxx variables defined above.
*/
private void updateLocked(String newName, int newState) {
// Retain only relevant bits
int headsetState = newState & SUPPORTED_HEADSETS;
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 | BIT_LINEOUT);
boolean h2wStateChange = true;
boolean usbStateChange = true;
if (LOG) Slog.v(TAG, "newName=" + newName
+ " newState=" + newState
+ " headsetState=" + headsetState
+ " prev headsetState=" + mHeadsetState);
if (mHeadsetState == headsetState) {
Log.e(TAG, "No state change.");
return;
}
// reject all suspect transitions: only accept state changes from:
// - a: 0 headset to 1 headset
// - b: 1 headset to 0 headset
if (h2w_headset == (BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT)) {
Log.e(TAG, "Invalid combination, 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 == BIT_USB_HEADSET_ANLG && usb_headset_dgtl == BIT_USB_HEADSET_DGTL) {
Log.e(TAG, "Invalid combination, unsetting usb flag");
usbStateChange = false;
}
if (!h2wStateChange && !usbStateChange) {
Log.e(TAG, "invalid transition, returning ...");
return;
}
mWakeLock.acquire();
Log.i(TAG, "MSG_NEW_DEVICE_STATE");
Log.i("qdd", "updateLocked --- sendmessage --- MSG_NEW_DEVICE_STATE");
Message msg = mHandler.obtainMessage(MSG_NEW_DEVICE_STATE, headsetState,mHeadsetState, "");//又是消息，继续跟。
mHandler.sendMessage(msg);
mHeadsetState = headsetState;
}
private final Handler mHandler = new Handler(Looper.myLooper(), null, true) {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_NEW_DEVICE_STATE:
Log.d("qdd","wiredAccessoryManager --- mHandler -- MSG_NEW_DEVICE_STATE --->setDevicesState : arg1 = " + msg.arg1 + ";arg2 = " + msg.arg2 + ";obj = " + (String)msg.obj);
setDevicesState(msg.arg1, msg.arg2, (String)msg.obj);//继续跟
mWakeLock.release();
break;
case MSG_SYSTEM_READY:
Log.d("qdd","wiredAccessoryManager --- mHandler -- MSG_SYSTEM_READY --->onSystemReady");
onSystemReady();
mWakeLock.release();
break;
}
}
};
private void setDevicesState(int headsetState, int prevHeadsetState, String headsetName) {
synchronized (mLock) {
int allHeadsets = SUPPORTED_HEADSETS;
for (int curHeadset = 1; allHeadsets != 0; curHeadset <<= 1) {
if ((curHeadset & allHeadsets) != 0) {
setDeviceStateLocked(curHeadset, headsetState, prevHeadsetState, headsetName);//继续，继续
allHeadsets &= ~curHeadset;
}
}
}
}
private void setDeviceStateLocked(int headset,int headsetState, int prevHeadsetState, String headsetName) {
if ((headsetState & headset) != (prevHeadsetState & headset)) {
int outDevice = 0;
int inDevice = 0;
int state;
if ((headsetState & headset) != 0) {
state = 1;
} else {
state = 0;
}
if (headset == BIT_HEADSET) {//这里就是根据耳机的类型，设置相应的音频输入和输出设备了
outDevice = AudioManager.DEVICE_OUT_WIRED_HEADSET;
inDevice = AudioManager.DEVICE_IN_WIRED_HEADSET;
} else if (headset == BIT_HEADSET_NO_MIC){
outDevice = AudioManager.DEVICE_OUT_WIRED_HEADPHONE;
} else if (headset == BIT_LINEOUT){
outDevice = AudioManager.DEVICE_OUT_LINE;
} else if (headset == BIT_USB_HEADSET_ANLG) {
outDevice = AudioManager.DEVICE_OUT_ANLG_DOCK_HEADSET;
} else if (headset == BIT_USB_HEADSET_DGTL) {
outDevice = AudioManager.DEVICE_OUT_DGTL_DOCK_HEADSET;
} else if (headset == BIT_HDMI_AUDIO) {
outDevice = AudioManager.DEVICE_OUT_HDMI;
} else {
Slog.e(TAG, "setDeviceState() invalid headset type: "+headset);
return;
}
if (LOG)
Slog.v(TAG, "device "+ headsetName+((state == 1) ? " connected" : " disconnected"));
//ALPS00708321:add for AB=00->01, set device BIT_HEADSET will ingore and music will pause when plug in
// headset complete,so need delay to confirm set device BIT_HEADSET to Audio
if (prevHeadsetState == BIT_HEADSET_NO_MIC && headsetState == BIT_HEADSET && state == 0) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// Ingore
}
}
Log.d(TAG, "WiredHeadset num_hs_pole is " + num_hs_pole);
if (state == 1){
if (num_hs_pole != "NA")
mAudioManager.setParameters(num_hs_pole);//这个参数是干什么的？跟到C++的代码，看不懂了
}
if (outDevice != 0) {
mAudioManager.setWiredDeviceConnectionState(outDevice, state, "", headsetName);//连接输出设备
}
if (inDevice != 0) {
mAudioManager.setWiredDeviceConnectionState(inDevice, state, "", headsetName);//连接输入设备，继续跟下，看看这个方法做什么的。
}
illegal_state = getIllegalHeadset();
if (49 == illegal_state) {
mHandler.postDelayed(new Runnable() {
public void run() {
illegal_state = getIllegalHeadset();
if (49 == illegal_state) {
Slog.d(TAG, "show illegal Headset msg+++++++++++++");
showheadsetToast();
illegal_state = 0;
} else {
Slog.d(TAG, "don't show illegal Headset msg+++++++++++++");
illegal_state = 0;
}
}
}, 500);
//illegal_state = 0;
}
}
}最后调用的是AudioService.java中的setWiredDeviceConnectionState方法：
public void setWiredDeviceConnectionState(int type, int state, String address, String name,String caller) {
synchronized (mConnectedDevices) {
if (DEBUG_DEVICES) {
Slog.i(TAG, "setWiredDeviceConnectionState(" + state + " nm: " + name + " addr:" + address + ")");
}
int delay = checkSendBecomingNoisyIntent(type, state);
queueMsgUnderWakeLock(mAudioHandler,
MSG_SET_WIRED_DEVICE_CONNECTION_STATE, //handler处理，跟这个消息
0,
0,
new WiredDeviceConnectionState(type, state, address, name, caller),
delay);
}
}
@Override
public void handleMessage(Message msg) {
// ...
case MSG_SET_WIRED_DEVICE_CONNECTION_STATE:
{ WiredDeviceConnectionState connectState = (WiredDeviceConnectionState)msg.obj;
onSetWiredDeviceConnectionState(connectState.mType, connectState.mState,
connectState.mAddress, connectState.mName, connectState.mCaller); //跟下去；
mAudioEventWakeLock.release();
}
break;
// ...
}
private void onSetWiredDeviceConnectionState(int device, int state, String address,String deviceName, String caller) {
if (DEBUG_DEVICES) {
Slog.i(TAG, "onSetWiredDeviceConnectionState(dev:" + Integer.toHexString(device)
+ " state:" + Integer.toHexString(state)
+ " address:" + address
+ " deviceName:" + deviceName
+ " caller: " + caller + ");");
}
synchronized (mConnectedDevices) {
Log.d(TAG, "onSetWiredDeviceConnectionState:" + "device:" + device + ",state:" + state);
/**
* M: do not broadcast if headset is connected for ALPS00850163 @{
*/
boolean shouldNotify = true;
if ((state == 0) && ((device == AudioSystem.DEVICE_OUT_WIRED_HEADSET) ||
(device == AudioSystem.DEVICE_OUT_WIRED_HEADPHONE) ||
(device == AudioSystem.DEVICE_OUT_LINE))) {
/**
* M: do not setForceUse if headset is connected for
* ALPS00657344 @{
*/
boolean isHeadphoneOff = (device == AudioSystem.DEVICE_OUT_WIRED_HEADPHONE);
boolean isHeadsetOn = mConnectedDevices.containsKey(new StringBuilder().append("0x")
.append(AudioSystem.DEVICE_OUT_WIRED_HEADSET).append(":").toString());
if (isHeadphoneOff && isHeadsetOn) {
shouldNotify = false;
Log.d(TAG, "onSetWiredDeviceConnectionState() no need to setForceUse");
}
if (shouldNotify) {
// @}
setBluetoothA2dpOnInt(true);
/// M: ALPS00657344 @{
}
/** @} */
}
boolean isUsb = ((device & ~AudioSystem.DEVICE_OUT_ALL_USB) == 0) ||
(((device & AudioSystem.DEVICE_BIT_IN) != 0) &&
((device & ~AudioSystem.DEVICE_IN_ALL_USB) == 0));
if (!handleDeviceConnection(state == 1, device, address, deviceName)) {
// change of connection state failed, bailout
return;
}
if (state != 0) {
if ((device == AudioSystem.DEVICE_OUT_WIRED_HEADSET) ||
(device == AudioSystem.DEVICE_OUT_WIRED_HEADPHONE) ||
(device == AudioSystem.DEVICE_OUT_LINE)) {
setBluetoothA2dpOnInt(false);
}
if ((device & mSafeMediaVolumeDevices) != 0) {
sendMsg(mAudioHandler,
MSG_CHECK_MUSIC_ACTIVE,
SENDMSG_REPLACE,
0,
0,
caller,
MUSIC_ACTIVE_POLL_PERIOD_MS);
}
// Television devices without CEC service apply software volume on HDMI output
if (isPlatformTelevision() && ((device & AudioSystem.DEVICE_OUT_HDMI) != 0)) {
mFixedVolumeDevices |= AudioSystem.DEVICE_OUT_HDMI;
checkAllFixedVolumeDevices();
if (mHdmiManager != null) {
synchronized (mHdmiManager) {
if (mHdmiPlaybackClient != null) {
mHdmiCecSink = false;
mHdmiPlaybackClient.queryDisplayStatus(mHdmiDisplayStatusCallback);
}
}
}
}
} else {
if (isPlatformTelevision() && ((device & AudioSystem.DEVICE_OUT_HDMI) != 0)) {
if (mHdmiManager != null) {
synchronized (mHdmiManager) {
mHdmiCecSink = false;
}
}
}
}
if (!isUsb && device != AudioSystem.DEVICE_IN_WIRED_HEADSET) {
//可以看到耳机插入，这里发送广播给上层app去接收。systemui会接收该广播，显示耳机插入图标。当然可以继续往下跟。直到sendbroadcast。
sendDeviceConnectionIntent(device, state, address, deviceName, shouldNotify);
}
}
}问题来了，framework这边是监听UEvent事件。那么kernel那边是怎么传递UEvent事件的？何时写那个event节点？
在kernel下面的Accdet.c和Switch_class.c文件中，但是看不懂。下面看下正常的log信息。(一次插拔)
上层log：
main.log:
Line 4700: 01-01 01:59:42.575111 297 655 D AudioHeadSetMessager: /sys/class/switch/h2w/state => 0
//这个是上层打印节点信息，为0表示没插耳机。但是这个信息并不是实时的，有触发条件才打印这个信息。
Line 5349: 01-01 01:59:46.025161 750 1746 I WiredAccessoryManager: MSG_NEW_DEVICE_STATE
Line 5350: 01-01 01:59:46.027819 750 750 D WiredAccessoryManager: WiredHeadset num_hs_pole is num_hs_pole=4 //耳机插入后，设置音频回路
Line 5483: 01-01 01:59:46.252001 297 655 D AudioHeadSetMessager: /sys/class/switch/h2w/state => 1
Line 6656: 01-01 01:59:51.816985 750 1746 I WiredAccessoryManager: MSG_NEW_DEVICE_STATE
Line 6657: 01-01 01:59:51.823965 750 750 D WiredAccessoryManager: WiredHeadset num_hs_pole is NA //耳机拔出。
sys.log:(UEVENT事件)
Line 1945: 01-01 01:59:46.023538 750 1746 V WiredAccessoryManager: Headset UEVENT: {SUBSYSTEM=switch, SEQNUM=2534, ACTION=change, SWITCH_STATE=1, SWITCH_NAME=h2w, DEVPATH=/devices/virtual/switch/h2w}
Line 2054: 01-01 01:59:51.784900 750 1746 V WiredAccessoryManager: Headset UEVENT: {SUBSYSTEM=switch, SEQNUM=2535, ACTION=change, SWITCH_STATE=0, SWITCH_NAME=h2w, DEVPATH=/devices/virtual/switch/h2w}
kernel.log:
Line 3391: 01-01 01:59:45.967827 112 112 D [ 7379.926647]-(0)[112:display_idle_de][name:accdet&]: [Accdet]Enter accdet_eint_func !!!!!!
Line 3391: 01-01 01:59:45.967827 112 112 D [ 7379.926647]-(0)[112:display_idle_de][name:accdet&]: [Accdet]Enter accdet_eint_func !!!!!!
Line 3391: 01-01 01:59:45.967827 112 112 D [ 7379.926647]-(0)[112:display_idle_de][name:accdet&]: [Accdet]Enter accdet_eint_func !!!!!!
Line 3394: 01-01 01:59:45.968990 112 112 D [ 7379.927810]-(0)[112:display_idle_de][name:accdet&]: [Accdet]accdet_eint_func after cur_eint_state=1 //当前耳机状态
Line 3394: 01-01 01:59:45.968990 112 112 D [ 7379.927810]-(0)[112:display_idle_de][name:accdet&]: [Accdet]accdet_eint_func after cur_eint_state=1
Line 3394: 01-01 01:59:45.968990 112 112 D [ 7379.927810]-(0)[112:display_idle_de][name:accdet&]: [Accdet]accdet_eint_func after cur_eint_state=1
Line 3395: 01-01 01:59:45.970231 3765 3765 D [ 7379.929051] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]ACC EINT func :plug-in, cur_eint_state = 1
Line 3395: 01-01 01:59:45.970231 3765 3765 D [ 7379.929051] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]ACC EINT func :plug-in, cur_eint_state = 1
Line 3396: 01-01 01:59:45.970296 3765 3765 D [ 7379.929116] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]accdet hardware init
Line 3396: 01-01 01:59:45.970296 3765 3765 D [ 7379.929116] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]accdet hardware init
Line 3396: 01-01 01:59:45.970296 3765 3765 D [ 7379.929116] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]accdet hardware init
Line 3397: 01-01 01:59:45.970553 3765 3765 D [ 7379.929373] (0)[3765:kworker/u8:3][name:accdet&]: accdet: enable_accdet
Line 3397: 01-01 01:59:45.970553 3765 3765 D [ 7379.929373] (0)[3765:kworker/u8:3][name:accdet&]: accdet: enable_accdet
Line 3397: 01-01 01:59:45.970553 3765 3765 D [ 7379.929373] (0)[3765:kworker/u8:3][name:accdet&]: accdet: enable_accdet
Line 3398: 01-01 01:59:45.970642 3765 3765 D [ 7379.929462] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]enable_irq !!!!!!
Line 3398: 01-01 01:59:45.970642 3765 3765 D [ 7379.929462] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]enable_irq !!!!!! //耳机插入使能中断，下面中断处理
Line 3408: 01-01 01:59:46.076401 54 54 D [ 7380.035221] (0)[54:pmic_thread][name:accdet&]: [accdet_int_handler]....
Line 3408: 01-01 01:59:46.076401 54 54 D [ 7380.035221] (0)[54:pmic_thread][name:accdet&]: [accdet_int_handler]....
Line 3409: 01-01 01:59:46.076448 54 54 D [ 7380.035268] (0)[54:pmic_thread][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x101
Line 3409: 01-01 01:59:46.076448 54 54 D [ 7380.035268] (0)[54:pmic_thread][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x101
Line 3409: 01-01 01:59:46.076448 54 54 D [ 7380.035268] (0)[54:pmic_thread][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x101
Line 3409: 01-01 01:59:46.076448 54 54 D [ 7380.035268] (0)[54:pmic_thread][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x101
Line 3411: 01-01 01:59:46.077660 3765 3765 D [ 7380.036480] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]accdet interrupt happen:[Plug_out]current AB = 1
Line 3411: 01-01 01:59:46.077660 3765 3765 D [ 7380.036480] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]accdet interrupt happen:[Plug_out]current AB = 1
Line 3411: 01-01 01:59:46.077660 3765 3765 D [ 7380.036480] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]accdet interrupt happen:[Plug_out]current AB = 1
Line 3412: 01-01 01:59:46.077717 3765 3765 D [ 7380.036537] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]check_cable_type:Clear interrupt:Done[0x0]!
Line 3412: 01-01 01:59:46.077717 3765 3765 D [ 7380.036537] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]check_cable_type:Clear interrupt:Done[0x0]!
Line 3413: 01-01 01:59:46.077736 3765 3765 D [ 7380.036556] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]cable type:[Headset_mic], status switch:[Plug_out]->[Headset_plug_in]
Line 3413: 01-01 01:59:46.077736 3765 3765 D [ 7380.036556] (0)[3765:kworker/u8:3][name:accdet&]: [Accdet]cable type:[Headset_mic], status switch:[Plug_out]->[Headset_plug_in]
Line 3414: 01-01 01:59:46.078033 3765 3765 D [ 7380.036853] (0)[3765:kworker/u8:3][name:accdet&]: [accdet] set state in cable_type status
Line 3414: 01-01 01:59:46.078033 3765 3765 D [ 7380.036853] (0)[3765:kworker/u8:3][name:accdet&]: [accdet] set state in cable_type status //kernel 处理耳机插入完毕
Line 3816: 01-01 01:59:51.835056 0 0 D [ 7385.793876]-(0)[0:swapper/0][name:accdet&]: [Accdet]Enter accdet_eint_func !!!!!!
Line 3816: 01-01 01:59:51.835056 0 0 D [ 7385.793876]-(0)[0:swapper/0][name:accdet&]: [Accdet]Enter accdet_eint_func !!!!!!
Line 3816: 01-01 01:59:51.835056 0 0 D [ 7385.793876]-(0)[0:swapper/0][name:accdet&]: [Accdet]Enter accdet_eint_func !!!!!!
Line 3819: 01-01 01:59:51.836283 0 0 D [ 7385.795103]-(0)[0:swapper/0][name:accdet&]: [Accdet]accdet_eint_func after cur_eint_state=0 //耳机拔出了
Line 3819: 01-01 01:59:51.836283 0 0 D [ 7385.795103]-(0)[0:swapper/0][name:accdet&]: [Accdet]accdet_eint_func after cur_eint_state=0
Line 3819: 01-01 01:59:51.836283 0 0 D [ 7385.795103]-(0)[0:swapper/0][name:accdet&]: [Accdet]accdet_eint_func after cur_eint_state=0
Line 3820: 01-01 01:59:51.837338 3764 3764 D [ 7385.796158] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]ACC EINT func :plug-out, cur_eint_state = 0
Line 3820: 01-01 01:59:51.837338 3764 3764 D [ 7385.796158] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]ACC EINT func :plug-out, cur_eint_state = 0
Line 3821: 01-01 01:59:51.837481 3764 3764 D [ 7385.796301] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x100
Line 3821: 01-01 01:59:51.837481 3764 3764 D [ 7385.796301] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x100
Line 3821: 01-01 01:59:51.837481 3764 3764 D [ 7385.796301] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x100
Line 3821: 01-01 01:59:51.837481 3764 3764 D [ 7385.796301] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]clear_accdet_interrupt: ACCDET_IRQ_STS = 0x100
Line 3822: 01-01 01:59:51.837792 3764 3764 D [ 7385.796612] (0)[3764:kworker/u8:2][name:accdet&]: accdet: disable_accdet
Line 3822: 01-01 01:59:51.837792 3764 3764 D [ 7385.796612] (0)[3764:kworker/u8:2][name:accdet&]: accdet: disable_accdet
Line 3822: 01-01 01:59:51.837792 3764 3764 D [ 7385.796612] (0)[3764:kworker/u8:2][name:accdet&]: accdet: disable_accdet
Line 3827: 01-01 01:59:51.868291 3764 3764 D [ 7385.827111] (0)[3764:kworker/u8:2][name:accdet&]: [accdet] set state in cable_type = NO_DEVICE //耳机拔出了
Line 3827: 01-01 01:59:51.868291 3764 3764 D [ 7385.827111] (0)[3764:kworker/u8:2][name:accdet&]: [accdet] set state in cable_type = NO_DEVICE
Line 3828: 01-01 01:59:51.868316 3764 3764 D [ 7385.827136] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]enable_irq !!!!!!
Line 3828: 01-01 01:59:51.868316 3764 3764 D [ 7385.827136] (0)[3764:kworker/u8:2][name:accdet&]: [Accdet]enable_irq !!!!!!