Update USB dialog for USB-C power option

Also includes a bit of visual updates, options now have summaries
as well.

Code has been refactored a bit, and is more flexible to easily
support any kind of power/data flow combination once its time
to support that.

Currently devices don't have USB-C ports, they can be simulated
with the following commands:
  $ adb shell dumpsys usb add-port "matrix" dual
  # ?s control whether these can be changed
  $ adb shell dumpsys usb connect-port "matrix" ufp? sink? device?
  # Do testing here
  $ adb shell dumpsys usb disconnect-port "matrix"
  $ adb shell dumpsys usb remove-port "matrix"
  $ adb shell dumpsys usb reset
  # Use the help for more info
  $ adb shell dumpsys usb -h

Bug: 21615151
Change-Id: I53ad4de51ff10a197c87bf2741756c1821ee9e74

src/com/android/settings/deviceinfo/UsbBackend.java

@@ -0,0 +1,145 @@
+/*
+ * 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.deviceinfo;
+
+import android.content.Context;
+import android.hardware.usb.UsbManager;
+import android.hardware.usb.UsbPort;
+import android.hardware.usb.UsbPortStatus;
+import android.os.UserManager;
+
+public class UsbBackend {
+
+    private static final int MODE_POWER_MASK  = 0x01;
+    public static final int MODE_POWER_SINK   = 0x00;
+    public static final int MODE_POWER_SOURCE = 0x01;
+
+    private static final int MODE_DATA_MASK  = 0x03 << 1;
+    public static final int MODE_DATA_NONE   = 0x00 << 1;
+    public static final int MODE_DATA_MTP    = 0x01 << 1;
+    public static final int MODE_DATA_PTP    = 0x02 << 1;
+    public static final int MODE_DATA_MIDI   = 0x03 << 1;
+
+    private final boolean mRestricted;
+
+    private UserManager mUserManager;
+    private UsbManager mUsbManager;
+    private UsbPort mPort;
+    private UsbPortStatus mPortStatus;
+
+    public UsbBackend(Context context) {
+        mUserManager = UserManager.get(context);
+        mUsbManager = context.getSystemService(UsbManager.class);
+
+        mRestricted = mUserManager.hasUserRestriction(UserManager.DISALLOW_USB_FILE_TRANSFER);
+        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.length;
+        for (int i = 0; i < N; i++) {
+            UsbPortStatus status = mUsbManager.getPortStatus(ports[i]);
+            if (status.isConnected()) {
+                mPort = ports[i];
+                mPortStatus = status;
+                break;
+            }
+        }
+    }
+
+    public int getCurrentMode() {
+        if (mPort != null) {
+            int power = mPortStatus.getCurrentPowerRole() == UsbPort.POWER_ROLE_SOURCE
+                    ? MODE_POWER_SOURCE : MODE_POWER_SINK;
+            return power | (mPortStatus.getCurrentDataRole() == UsbPort.DATA_ROLE_DEVICE
+                    ? getUsbDataMode() : MODE_DATA_NONE);
+        }
+        return MODE_POWER_SINK | getUsbDataMode();
+    }
+
+    public int getUsbDataMode() {
+        if (!mUsbManager.isUsbDataUnlocked()) {
+            return MODE_DATA_NONE;
+        } else if (mUsbManager.isFunctionEnabled(UsbManager.USB_FUNCTION_MTP)) {
+            return MODE_DATA_MTP;
+        } else if (mUsbManager.isFunctionEnabled(UsbManager.USB_FUNCTION_PTP)) {
+            return MODE_DATA_MTP;
+        } else if (mUsbManager.isFunctionEnabled(UsbManager.USB_FUNCTION_MIDI)) {
+            return MODE_DATA_MIDI;
+        }
+        return MODE_DATA_NONE; // ...
+    }
+
+    private void setUsbFunction(int mode) {
+        switch (mode) {
+            case MODE_DATA_MTP:
+                mUsbManager.setCurrentFunction(UsbManager.USB_FUNCTION_MTP);
+                mUsbManager.setUsbDataUnlocked(true);
+                break;
+            case MODE_DATA_PTP:
+                mUsbManager.setCurrentFunction(UsbManager.USB_FUNCTION_PTP);
+                mUsbManager.setUsbDataUnlocked(true);
+                break;
+            case MODE_DATA_MIDI:
+                mUsbManager.setCurrentFunction(UsbManager.USB_FUNCTION_MIDI);
+                mUsbManager.setUsbDataUnlocked(true);
+                break;
+            default:
+                mUsbManager.setCurrentFunction(null);
+                mUsbManager.setUsbDataUnlocked(false);
+                break;
+        }
+    }
+
+    public void setMode(int mode) {
+        if (mPort != null) {
+            int powerRole = modeToPower(mode);
+            // If we aren't using any data modes and we support host mode, then go to host mode
+            // so maybe? the other device can provide data if it wants, otherwise go into device
+            // mode because we have no choice.
+            int dataRole = (mode & MODE_DATA_MASK) == MODE_DATA_NONE
+                    && mPortStatus.isRoleCombinationSupported(powerRole, UsbPort.DATA_ROLE_HOST)
+                    ? UsbPort.DATA_ROLE_HOST : UsbPort.DATA_ROLE_DEVICE;
+            mUsbManager.setPortRoles(mPort, powerRole, dataRole);
+        }
+        setUsbFunction(mode & MODE_DATA_MASK);
+    }
+
+    private int modeToPower(int mode) {
+        return (mode & MODE_POWER_MASK) == MODE_POWER_SOURCE
+                    ? UsbPort.POWER_ROLE_SOURCE : UsbPort.POWER_ROLE_SINK;
+    }
+
+    public boolean isModeSupported(int mode) {
+        if (mRestricted && (mode & MODE_DATA_MASK) != MODE_DATA_NONE) {
+            // No USB data modes are supported.
+            return false;
+        }
+        if (mPort != null) {
+            int power = modeToPower(mode);
+            if ((mode & MODE_DATA_MASK) != 0) {
+                // We have a port and data, need to be in device mode.
+                return mPortStatus.isRoleCombinationSupported(power,
+                        UsbPort.DATA_ROLE_DEVICE);
+            } else {
+                // No data needed, we can do this power mode in either device or host.
+                return mPortStatus.isRoleCombinationSupported(power, UsbPort.DATA_ROLE_DEVICE)
+                        || mPortStatus.isRoleCombinationSupported(power, UsbPort.DATA_ROLE_HOST);
+            }
+        }
+        // No port, support sink modes only.
+        return (mode & MODE_POWER_MASK) != MODE_POWER_SOURCE;
+    }
+}