Android 耳機插入過程分析

參考鏈接：

https://www.jianshu.com/p/d82a8dabb3e7

初始化：

10-26 07:40:43.932 1414 1414 I SystemServer: StartWiredAccessoryManager

10-26 07:40:43.936 1414 1414 W WiredAccessoryManager: This kernel does not have usb audio support

10-26 07:40:43.937 1414 1414 W WiredAccessoryManager: This kernel does not have HDMI audio support

10-26 07:40:43.937 1414 1414 W WiredAccessoryManager: This kernel does not have DP audio support

10-26 07:40:43.937 1414 1414 D SystemServerTiming: StartWiredAccessoryManager took to complete: 6ms

10-26 07:40:46.375 1414 1414 V WiredAccessoryManager: notifyWiredAccessoryChanged: when=0 bits= mask=54

10-26 07:40:46.375 1414 1414 V WiredAccessoryManager: newName=h2w newState=0 headsetState=0 prev headsetState=0

10-26 07:40:46.375 1414 1414 E WiredAccessoryManager: No state change.

10-26 07:40:46.375 1414 1414 V WiredAccessoryManager: init()

耳機插入

10-26 11:26:48.552 1414 1684 V WiredAccessoryManager: notifyWiredAccessoryChanged: when=13604972191000 bits=SW_HEADPHONE_INSERT SW_MICROPHONE_INSERT mask=94

10-26 11:26:48.552 1414 1684 V WiredAccessoryManager: newName=h2w newState=1 headsetState=1 prev headsetState=0

10-26 11:26:48.554 1414 1684 I WiredAccessoryManager: MSG_NEW_DEVICE_STATE

10-26 11:26:48.555 1414 1414 V WiredAccessoryManager: headsetName: connected

耳機拔出

10-26 11:26:53.134 1414 1684 V WiredAccessoryManager: notifyWiredAccessoryChanged: when=13609554723000 bits= mask=94

10-26 11:26:53.134 1414 1684 V WiredAccessoryManager: newName=h2w newState=0 headsetState=0 prev headsetState=1

10-26 11:26:53.136 1414 1684 I WiredAccessoryManager: MSG_NEW_DEVICE_STATE

10-26 11:26:53.137 1414 1414 V WiredAccessoryManager: headsetName: disconnected

高通讀取外設插入方式有兩種：

1. UEvent：

讀取/sys/class/switch/h2w/state文件等狀態

2. InputEvent：

讀取/dev/input/event

通過屬性值,判斷采用何種方式。

frameworks\base\core\res\res\values\config.xml

true

getevent

add device 1: /dev/input/event7

name: "msm8953-snd-card-mtp Button Jack"

add device 2: /dev/input/event6

name: "msm8953-snd-card-mtp Headset Jack"

add device 3: /dev/input/event2

name: "goodix-ts"

add device 4: /dev/input/event3

name: "hbtp_vm"

could not get driver version for /dev/input/mouse0, Not a typewriter

add device 5: /dev/input/event0

name: "qpnp_pon"

could not get driver version for /dev/input/mice, Not a typewriter

add device 6: /dev/input/event1

name: "tsu6721"

add device 7: /dev/input/event4

name: "keyremap_virtual"

add device 8: /dev/input/event5

name: "gpio-keys"

插入：

/dev/input/event6: 0005 0002 00000001

/dev/input/event6: 0005 0004 00000001

/dev/input/event6: 0005 0007 00000001

/dev/input/event6: 0000 0000 00000000

拔出：

/dev/input/event6: 0005 0002 00000000

/dev/input/event6: 0005 0004 00000000

/dev/input/event6: 0005 0007 00000000

/dev/input/event6: 0000 0000 00000000

getevent -l

/dev/input/event6: EV_SW SW_HEADPHONE_INSERT 00000001

/dev/input/event6: EV_SW SW_MICROPHONE_INSERT 00000001

/dev/input/event6: EV_SW SW_JACK_PHYSICAL_INS 00000001

/dev/input/event6: EV_SYN SYN_REPORT 00000000

/dev/input/event6: EV_SW SW_HEADPHONE_INSERT 00000000

/dev/input/event6: EV_SW SW_MICROPHONE_INSERT 00000000

/dev/input/event6: EV_SW SW_JACK_PHYSICAL_INS 00000000

/dev/input/event6: EV_SYN SYN_REPORT 00000000

代碼跟蹤

frameworks\base\services\core\java\com\android\server\input\InputManagerService.java

mUseDevInputEventForAudioJack =

context.getResources().getBoolean(R.bool.config_useDevInputEventForAudioJack);

if (mUseDevInputEventForAudioJack && (switchMask & SW_JACK_BITS) != 0) {

mWiredAccessoryCallbacks.notifyWiredAccessoryChanged(whenNanos, switchValues,

switchMask);

}

frameworks\base\services\core\java\com\android\server\WiredAccessoryManager.java

public void notifyWiredAccessoryChanged(long whenNanos, int switchValues, int switchMask) {

if (LOG) Slog.v(TAG, "notifyWiredAccessoryChanged: when=" + whenNanos

+ " bits=" + switchCodeToString(switchValues, switchMask)

+ " mask=" + Integer.toHexString(switchMask));

synchronized (mLock) {

int headset;

mSwitchValues = (mSwitchValues & ~switchMask) | switchValues;

switch (mSwitchValues &

(SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT | SW_LINEOUT_INSERT_BIT)) {

case 0:

headset = 0;

break;

case SW_HEADPHONE_INSERT_BIT:

headset = BIT_HEADSET_NO_MIC;

break;

case SW_LINEOUT_INSERT_BIT:

headset = BIT_LINEOUT;

break;

case SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT:

headset = BIT_HEADSET;

break;

case SW_MICROPHONE_INSERT_BIT:

headset = BIT_HEADSET;

break;

default:

headset = 0;

break;

}

updateLocked(NAME_H2W,

(mHeadsetState & ~(BIT_HEADSET | BIT_HEADSET_NO_MIC | BIT_LINEOUT)) | headset);

}

}

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();

// 發送數據給

Log.i(TAG, "MSG_NEW_DEVICE_STATE");

Message msg = mHandler.obtainMessage(MSG_NEW_DEVICE_STATE, headsetState,

mHeadsetState, "");

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:

setDevicesState(msg.arg1, msg.arg2, (String)msg.obj);

mWakeLock.release();

break;

case MSG_SYSTEM_READY:

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);

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) {

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, "headsetName: " + headsetName +

(state == 1 ? " connected" : " disconnected"));

}

// 發送給audio manager.

if (outDevice != 0) {

mAudioManager.setWiredDeviceConnectionState(outDevice, state, "", headsetName);

}

if (inDevice != 0) {

mAudioManager.setWiredDeviceConnectionState(inDevice, state, "", headsetName);

}

}

}

總結

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