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/*
* Copyright (C) 2015 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.settings.connecteddevice.usb;
import static android.hardware.usb.UsbPortStatus.DATA_ROLE_DEVICE;
import static android.hardware.usb.UsbPortStatus.POWER_ROLE_NONE;
import static android.hardware.usb.UsbPortStatus.POWER_ROLE_SOURCE;
import static android.service.usb.UsbPortStatusProto.DATA_ROLE_HOST;
import static android.service.usb.UsbPortStatusProto.DATA_ROLE_NONE;
import static android.service.usb.UsbPortStatusProto.POWER_ROLE_SINK;
import android.annotation.Nullable;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbPort;
import android.hardware.usb.UsbPortStatus;
import android.net.ConnectivityManager;
import android.os.UserHandle;
import android.os.UserManager;
import androidx.annotation.VisibleForTesting;
import java.util.List;
/**
* Provides access to underlying system USB functionality.
*/
public class UsbBackend {
static final int PD_ROLE_SWAP_TIMEOUT_MS = 3000;
static final int NONPD_ROLE_SWAP_TIMEOUT_MS = 15000;
private final boolean mFileTransferRestricted;
private final boolean mFileTransferRestrictedBySystem;
private final boolean mTetheringRestricted;
private final boolean mTetheringRestrictedBySystem;
private final boolean mMidiSupported;
private final boolean mTetheringSupported;
private UsbManager mUsbManager;
@Nullable
private UsbPort mPort;
@Nullable
private UsbPortStatus mPortStatus;
public UsbBackend(Context context) {
this(context, (UserManager) context.getSystemService(Context.USER_SERVICE));
}
@VisibleForTesting
public UsbBackend(Context context, UserManager userManager) {
mUsbManager = context.getSystemService(UsbManager.class);
mFileTransferRestricted = isUsbFileTransferRestricted(userManager);
mFileTransferRestrictedBySystem = isUsbFileTransferRestrictedBySystem(userManager);
mTetheringRestricted = isUsbTetheringRestricted(userManager);
mTetheringRestrictedBySystem = isUsbTetheringRestrictedBySystem(userManager);
mMidiSupported = context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_MIDI);
ConnectivityManager cm =
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
mTetheringSupported = cm.isTetheringSupported();
updatePorts();
}
public long getCurrentFunctions() {
return mUsbManager.getCurrentFunctions();
}
public void setCurrentFunctions(long functions) {
mUsbManager.setCurrentFunctions(functions);
}
public long getDefaultUsbFunctions() {
return mUsbManager.getScreenUnlockedFunctions();
}
public void setDefaultUsbFunctions(long functions) {
mUsbManager.setScreenUnlockedFunctions(functions);
}
public boolean areFunctionsSupported(long functions) {
if ((!mMidiSupported && (functions & UsbManager.FUNCTION_MIDI) != 0)
|| (!mTetheringSupported && (functions & UsbManager.FUNCTION_RNDIS) != 0)) {
return false;
}
return !(areFunctionDisallowed(functions) || areFunctionsDisallowedBySystem(functions));
}
public int getPowerRole() {
updatePorts();
return mPortStatus == null ? POWER_ROLE_NONE : mPortStatus.getCurrentPowerRole();
}
public int getDataRole() {
updatePorts();
return mPortStatus == null ? DATA_ROLE_NONE : mPortStatus.getCurrentDataRole();
}
public void setPowerRole(int role) {
int newDataRole = getDataRole();
if (!areAllRolesSupported()) {
switch (role) {
case POWER_ROLE_SINK:
newDataRole = DATA_ROLE_DEVICE;
break;
case POWER_ROLE_SOURCE:
newDataRole = DATA_ROLE_HOST;
break;
default:
newDataRole = DATA_ROLE_NONE;
}
}
if (mPort != null) {
mPort.setRoles(role, newDataRole);
}
}
public void setDataRole(int role) {
int newPowerRole = getPowerRole();
if (!areAllRolesSupported()) {
switch (role) {
case DATA_ROLE_DEVICE:
newPowerRole = POWER_ROLE_SINK;
break;
case DATA_ROLE_HOST:
newPowerRole = POWER_ROLE_SOURCE;
break;
default:
newPowerRole = POWER_ROLE_NONE;
}
}
if (mPort != null) {
mPort.setRoles(newPowerRole, role);
}
}
public boolean areAllRolesSupported() {
return mPort != null && mPortStatus != null
&& mPortStatus.isRoleCombinationSupported(POWER_ROLE_SINK, DATA_ROLE_DEVICE)
&& mPortStatus.isRoleCombinationSupported(POWER_ROLE_SINK, DATA_ROLE_HOST)
&& mPortStatus.isRoleCombinationSupported(POWER_ROLE_SOURCE, DATA_ROLE_DEVICE)
&& mPortStatus.isRoleCombinationSupported(POWER_ROLE_SOURCE, DATA_ROLE_HOST);
}
public static String usbFunctionsToString(long functions) {
// TODO replace with UsbManager.usbFunctionsToString once supported by Roboelectric
return Long.toBinaryString(functions);
}
public static long usbFunctionsFromString(String functions) {
// TODO replace with UsbManager.usbFunctionsFromString once supported by Roboelectric
return Long.parseLong(functions, 2);
}
public static String dataRoleToString(int role) {
return Integer.toString(role);
}
public static int dataRoleFromString(String role) {
return Integer.parseInt(role);
}
private static boolean isUsbFileTransferRestricted(UserManager userManager) {
return userManager.hasUserRestriction(UserManager.DISALLOW_USB_FILE_TRANSFER);
}
private static boolean isUsbTetheringRestricted(UserManager userManager) {
return userManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_TETHERING);
}
private static boolean isUsbFileTransferRestrictedBySystem(UserManager userManager) {
return userManager.hasBaseUserRestriction(
UserManager.DISALLOW_USB_FILE_TRANSFER, UserHandle.of(UserHandle.myUserId()));
}
private static boolean isUsbTetheringRestrictedBySystem(UserManager userManager) {
return userManager.hasBaseUserRestriction(
UserManager.DISALLOW_CONFIG_TETHERING, UserHandle.of(UserHandle.myUserId()));
}
private boolean areFunctionDisallowed(long functions) {
return (mFileTransferRestricted && ((functions & UsbManager.FUNCTION_MTP) != 0
|| (functions & UsbManager.FUNCTION_PTP) != 0))
|| (mTetheringRestricted && ((functions & UsbManager.FUNCTION_RNDIS) != 0));
}
private boolean areFunctionsDisallowedBySystem(long functions) {
return (mFileTransferRestrictedBySystem && ((functions & UsbManager.FUNCTION_MTP) != 0
|| (functions & UsbManager.FUNCTION_PTP) != 0))
|| (mTetheringRestrictedBySystem && ((functions & UsbManager.FUNCTION_RNDIS) != 0));
}
private void updatePorts() {
mPort = null;
mPortStatus = null;
List<UsbPort> ports = mUsbManager.getPorts();
// For now look for a connected port, in the future we should identify port in the
// notification and pick based on that.
final int N = ports.size();
for (int i = 0; i < N; i++) {
UsbPortStatus status = ports.get(i).getStatus();
if (status.isConnected()) {
mPort = ports.get(i);
mPortStatus = status;
break;
}
}
}
}
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