UsbService: Handle the case where a USB accessory connects as the device is booting (1c0e5436) · Commits · e / os / android_frameworks_base

services/java/com/android/server/usb/UsbService.java

+75 −27

Original line number	Diff line number	Diff line
		@@ -17,9 +17,11 @@
		package com.android.server.usb;

		import android.app.PendingIntent;
		import android.content.BroadcastReceiver;
		import android.content.ContentResolver;
		import android.content.Context;
		import android.content.Intent;
		import android.content.IntentFilter;
		import android.content.pm.PackageManager;
		import android.hardware.usb.IUsbManager;
		import android.hardware.usb.UsbAccessory;
		@@ -112,35 +114,40 @@ public class UsbService extends IUsbManager.Stub {
		private final boolean mHasUsbHost;
		private final boolean mHasUsbAccessory;

		private final void readCurrentAccessoryLocked() {
		if (mHasUsbAccessory) {
		String[] strings = nativeGetAccessoryStrings();
		if (strings != null) {
		mCurrentAccessory = new UsbAccessory(strings);
		Log.d(TAG, "entering USB accessory mode: " + mCurrentAccessory);
		if (mSystemReady) {
		mDeviceManager.accessoryAttached(mCurrentAccessory);
		}
		} else {
		Log.e(TAG, "nativeGetAccessoryStrings failed");
		}
		}
		}

		/*
		* Handles USB function enable/disable events (device mode)
		*/
		private final void functionEnabledLocked(String function, boolean enabled) {
		boolean enteringAccessoryMode =
		(mHasUsbAccessory && enabled && UsbManager.USB_FUNCTION_ACCESSORY.equals(function));

		if (enabled) {
		if (!mEnabledFunctions.contains(function)) {
		mEnabledFunctions.add(function);
		}
		mDisabledFunctions.remove(function);

		if (UsbManager.USB_FUNCTION_ACCESSORY.equals(function)) {
		readCurrentAccessoryLocked();
		}
		} else {
		if (!mDisabledFunctions.contains(function)) {
		mDisabledFunctions.add(function);
		}
		mEnabledFunctions.remove(function);
		}

		if (enteringAccessoryMode) {
		String[] strings = nativeGetAccessoryStrings();
		if (strings != null) {
		mCurrentAccessory = new UsbAccessory(strings);
		Log.d(TAG, "entering USB accessory mode: " + mCurrentAccessory);
		mDeviceManager.accessoryAttached(mCurrentAccessory);
		} else {
		Log.e(TAG, "nativeGetAccessoryStrings failed");
		}
		}
		}

		/*
		@@ -193,6 +200,17 @@ public class UsbService extends IUsbManager.Stub {
		}
		};

		private final BroadcastReceiver mBootCompletedReceiver = new BroadcastReceiver() {
		public void onReceive(Context context, Intent intent) {
		// handle accessories attached at boot time
		synchronized (mLock) {
		if (mCurrentAccessory != null) {
		mDeviceManager.accessoryAttached(mCurrentAccessory);
		}
		}
		}
		};

		public UsbService(Context context) {
		mContext = context;
		mDeviceManager = new UsbDeviceSettingsManager(context);
		@@ -203,17 +221,21 @@ public class UsbService extends IUsbManager.Stub {
		mHostBlacklist = context.getResources().getStringArray(
		com.android.internal.R.array.config_usbHostBlacklist);

		synchronized (mLock) {
		init(); // set initial status

		// Watch for USB configuration changes
		if (mConfiguration >= 0) {
		mUEventObserver.startObserving(USB_CONNECTED_MATCH);
		mUEventObserver.startObserving(USB_CONFIGURATION_MATCH);
		mUEventObserver.startObserving(USB_FUNCTIONS_MATCH);
		}
		}
		}

		private final void init() {
		char[] buffer = new char[1024];
		boolean inAccessoryMode = false;

		// Read initial USB state (device mode)
		mConfiguration = -1;
		@@ -233,8 +255,10 @@ public class UsbService extends IUsbManager.Stub {
		} catch (Exception e) {
		Slog.e(TAG, "" , e);
		}
		if (mConfiguration < 0)
		if (mConfiguration < 0) {
		// This may happen in the emulator or devices without USB device mode support
		return;
		}

		// Read initial list of enabled and disabled functions (device mode)
		try {
		@@ -248,9 +272,13 @@ public class UsbService extends IUsbManager.Stub {
		String functionName = files[i].getName();
		if (value == 1) {
		mEnabledFunctions.add(functionName);
		if (UsbManager.USB_FUNCTION_ACCESSORY.equals(functionName)) {
		// The USB accessory driver is on by default, but it might have been
		// enabled before the USB service has initialized.
		inAccessoryMode = true;
		} else if (!UsbManager.USB_FUNCTION_ADB.equals(functionName)) {
		// adb is enabled/disabled automatically by the adbd daemon,
		// so don't treat it as a default function
		if (!UsbManager.USB_FUNCTION_ADB.equals(functionName)) {
		// so don't treat it as a default function.
		mDefaultFunctions.add(functionName);
		}
		} else {
		@@ -262,6 +290,21 @@ public class UsbService extends IUsbManager.Stub {
		} catch (Exception e) {
		Slog.e(TAG, "" , e);
		}

		// handle the case where an accessory switched the driver to accessory mode
		// before the framework finished booting
		if (inAccessoryMode) {
		readCurrentAccessoryLocked();

		// FIXME - if we booted in accessory mode, then we have no way to figure out
		// which functions are enabled by default.
		// For now, assume that MTP or mass storage are the only possibilities
		if (mDisabledFunctions.contains(UsbManager.USB_FUNCTION_MTP)) {
		mDefaultFunctions.add(UsbManager.USB_FUNCTION_MTP);
		} else if (mDisabledFunctions.contains(UsbManager.USB_FUNCTION_MASS_STORAGE)) {
		mDefaultFunctions.add(UsbManager.USB_FUNCTION_MASS_STORAGE);
		}
		}
		}

		private boolean isBlackListed(String deviceName) {
		@@ -381,6 +424,13 @@ public class UsbService extends IUsbManager.Stub {
		}

		update(false);
		if (mCurrentAccessory != null) {
		Log.d(TAG, "accessoryAttached at systemReady");
		// its still too early to handle accessories, so add a BOOT_COMPLETED receiver
		// to handle this later.
		mContext.registerReceiver(mBootCompletedReceiver,
		new IntentFilter(Intent.ACTION_BOOT_COMPLETED));
		}
		mSystemReady = true;
		}
		}
		@@ -512,20 +562,18 @@ public class UsbService extends IUsbManager.Stub {
		if (mConnected != mLastConnected \|\| mConfiguration != mLastConfiguration) {
		if (mConnected == 0) {
		// make sure accessory mode is off, and restore default functions
		if (UsbManager.setFunctionEnabled(
		if (mCurrentAccessory != null && UsbManager.setFunctionEnabled(
		UsbManager.USB_FUNCTION_ACCESSORY, false)) {
		Log.d(TAG, "exited USB accessory mode");

		int count = mDefaultFunctions.size();
		for (int i = 0; i < count; i++) {
		String function = mDefaultFunctions.get(i);
		if (UsbManager.setFunctionEnabled(function, true)) {
		if (!UsbManager.setFunctionEnabled(function, true)) {
		Log.e(TAG, "could not reenable function " + function);
		}
		}
		}

		if (mCurrentAccessory != null) {
		mDeviceManager.accessoryDetached(mCurrentAccessory);
		mCurrentAccessory = null;
		}