From 3f6ef34b35e234b82e54f02703a7096e029acd49 Mon Sep 17 00:00:00 2001
From: Mike Lockwood <lockwood@google.com>
Date: Mon, 22 Sep 2014 12:15:24 -0700
Subject: [PATCH] Add developer setting for changing the current USB
 configuration

This can be useful for testing the audio source kernel driver,
reverse tethering over RNDIS, etc.

Change-Id: I7392f95545cf5ae8a36b4b7b0d37f003df7e70b2
---
 res/values/arrays.xml                         | 25 +++++++++
 res/values/strings.xml                        |  4 ++
 res/xml/development_prefs.xml                 |  7 +++
 .../android/settings/DevelopmentSettings.java | 54 +++++++++++++++++++
 4 files changed, 90 insertions(+)

diff --git a/res/values/arrays.xml b/res/values/arrays.xml
index 4c48c6b3167..1f436f40a34 100644
--- a/res/values/arrays.xml
+++ b/res/values/arrays.xml
@@ -1283,4 +1283,29 @@
         <item>@color/red_500</item>
         <item>@color/orange_500</item>
     </integer-array>
+
+    <!-- USB configuration names for Developer Settings.
+         This can be overridden by devices with additional USB configurations. -->
+    <string-array name="usb_configuration_titles">
+        <item>MTP (Media Transfer Protocol)</item>
+        <item>PTP (Picture Transfer Protocol)</item>
+        <item>RNDIS (USB Ethernet)</item>
+        <item>Audio Source</item>
+    </string-array>
+
+    <!-- USB configuration values for Developer Settings.
+         These are lists of USB functions passed to the USB Manager to change USB configuraton.
+         This can be overridden by devices with additional USB configurations.
+         Do not translate. -->
+    <string-array name="usb_configuration_values" translatable="false">
+        <!-- Do not translate. -->
+        <item>mtp</item>
+        <!-- Do not translate. -->
+        <item>ptp</item>
+        <!-- Do not translate. -->
+        <item>rndis</item>
+        <!-- Do not translate. -->
+        <item>audio_source</item>
+    </string-array>
+
 </resources>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index f467e99cc88..3117f8b8bfb 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -3419,6 +3419,10 @@
     <string name="select_logd_size_title">Logger buffer sizes</string>
     <!-- UI debug setting: limit size of Android logger buffers [CHAR LIMIT=59] -->
     <string name="select_logd_size_dialog_title">Select Logger sizes per log buffer</string>
+    <!-- UI debug setting: select USB configuration -->
+    <string name="select_usb_configuration_title">Select USB Configuration</string>
+    <!-- UI debug setting: limit size of Android logger buffers [CHAR LIMIT=59] -->
+    <string name="select_usb_configuration_dialog_title">Select USB Configuration</string>
     <!-- Setting Checkbox title whether to allow mock locations -->
     <string name="allow_mock_location">Allow mock locations</string>
     <!-- setting Checkbox summary whether to allow mock locations  -->
diff --git a/res/xml/development_prefs.xml b/res/xml/development_prefs.xml
index 128aa5f554d..22c39116a1c 100644
--- a/res/xml/development_prefs.xml
+++ b/res/xml/development_prefs.xml
@@ -130,6 +130,13 @@
             android:entries="@array/select_logd_size_titles"
             android:entryValues="@array/select_logd_size_values" />
 
+        <ListPreference
+            android:key="select_usb_configuration"
+            android:title="@string/select_usb_configuration_title"
+            android:dialogTitle="@string/select_usb_configuration_dialog_title"
+            android:entries="@array/usb_configuration_titles"
+            android:entryValues="@array/usb_configuration_values" />
+
     </PreferenceCategory>
 
     <PreferenceCategory android:key="debug_input_category"
diff --git a/src/com/android/settings/DevelopmentSettings.java b/src/com/android/settings/DevelopmentSettings.java
index f5704c1b956..7098bedbea5 100644
--- a/src/com/android/settings/DevelopmentSettings.java
+++ b/src/com/android/settings/DevelopmentSettings.java
@@ -23,15 +23,18 @@ import android.app.Dialog;
 import android.app.admin.DevicePolicyManager;
 import android.app.backup.IBackupManager;
 import android.bluetooth.BluetoothAdapter;
+import android.content.BroadcastReceiver;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.ResolveInfo;
 import android.hardware.usb.IUsbManager;
+import android.hardware.usb.UsbManager;
 import android.net.wifi.WifiManager;
 import android.os.AsyncTask;
 import android.os.BatteryManager;
@@ -142,6 +145,8 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
     private static final String SELECT_LOGD_SIZE_KEY = "select_logd_size";
     private static final String SELECT_LOGD_SIZE_PROPERTY = "persist.logd.size";
     private static final String SELECT_LOGD_DEFAULT_SIZE_PROPERTY = "ro.logd.size";
+    private static final String USB_CONFIGURATION_KEY = "select_usb_configuration";
+    private static final String SELECT_USB_CONFIGURATION_PROPERTY = "sys.usb.config";
 
     private static final String OPENGL_TRACES_KEY = "enable_opengl_traces";
 
@@ -211,6 +216,7 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
     private CheckBoxPreference mForceRtlLayout;
     private ListPreference mDebugHwOverdraw;
     private ListPreference mLogdSize;
+    private ListPreference mUsbConfiguration;
     private ListPreference mTrackFrameTime;
     private ListPreference mShowNonRectClip;
     private ListPreference mWindowAnimationScale;
@@ -335,6 +341,7 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
         mWifiAggressiveHandover = findAndInitCheckboxPref(WIFI_AGGRESSIVE_HANDOVER_KEY);
         mWifiAllowScansWithTraffic = findAndInitCheckboxPref(WIFI_ALLOW_SCAN_WITH_TRAFFIC_KEY);
         mLogdSize = addListPreference(SELECT_LOGD_SIZE_KEY);
+        mUsbConfiguration = addListPreference(USB_CONFIGURATION_KEY);
 
         mWindowAnimationScale = addListPreference(WINDOW_ANIMATION_SCALE_KEY);
         mTransitionAnimationScale = addListPreference(TRANSITION_ANIMATION_SCALE_KEY);
@@ -480,6 +487,7 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
         }
         mSwitchBar.removeOnSwitchChangeListener(this);
         mSwitchBar.hide();
+        getActivity().unregisterReceiver(mUsbReceiver);
     }
 
     void updateCheckBox(CheckBoxPreference checkBox, boolean value) {
@@ -1120,6 +1128,42 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
         updateLogdSizeValues();
     }
 
+    private void updateUsbConfigurationValues() {
+        if (mUsbConfiguration != null) {
+            String currentValue = SystemProperties.get(SELECT_USB_CONFIGURATION_PROPERTY);
+
+            // Ignore adb interface. The USB Manager adds or removes adb automatically
+            // depending on if USB debugging is enabled.
+            int adbIndex = currentValue.indexOf(",adb");
+            if (adbIndex > 0) {
+                currentValue = currentValue.substring(0, adbIndex);
+            }
+
+            String[] values = getResources().getStringArray(R.array.usb_configuration_values);
+            String[] titles = getResources().getStringArray(R.array.usb_configuration_titles);
+            int index = 1; // punt to second entry if not found
+            for (int i = 0; i < titles.length; i++) {
+                if (currentValue.equals(values[i])) {
+                    index = i;
+                    break;
+                }
+            }
+            if (index >= 0) {
+                mUsbConfiguration.setValue(values[index]);
+                mUsbConfiguration.setSummary(titles[index]);
+            } else {
+                mUsbConfiguration.setValue("");
+                mUsbConfiguration.setSummary("");
+            }
+            mUsbConfiguration.setOnPreferenceChangeListener(this);
+        }
+    }
+
+    private void writeUsbConfigurationOption(Object newValue) {
+        UsbManager manager = (UsbManager)getActivity().getSystemService(Context.USB_SERVICE);
+        manager.setCurrentFunction(newValue.toString(), false);
+    }
+
     private void updateCpuUsageOptions() {
         updateCheckBox(mShowCpuUsage, Settings.Global.getInt(getActivity().getContentResolver(),
                 Settings.Global.SHOW_PROCESSES, 0) != 0);
@@ -1437,6 +1481,9 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
         } else if (preference == mLogdSize) {
             writeLogdSizeOption(newValue);
             return true;
+        } else if (preference == mUsbConfiguration) {
+            writeUsbConfigurationOption(newValue);
+            return true;
         } else if (preference == mWindowAnimationScale) {
             writeAnimationScaleOption(0, mWindowAnimationScale, newValue);
             return true;
@@ -1551,6 +1598,13 @@ public class DevelopmentSettings extends SettingsPreferenceFragment
         }
     }
 
+    private BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            updateUsbConfigurationValues();
+        }
+    };
+
     static class SystemPropPoker extends AsyncTask<Void, Void, Void> {
         @Override
         protected Void doInBackground(Void... params) {