USB: Add support for disabling USB permission dialogs.

Setting scom.android.internal.R.bool.config_disableUsbPermissionDialogs to true
will disable all USB permission dialogs, allowing apps access to USB devices
and accessories by default.

For prototyping purposes only. This should not be used in real devices.

Bug: 13437578
Change-Id: Ie7bf83882943930b15e5f1edb3044a4a52034273

3 files changed, 20 insertions, 2 deletions

diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index cfd4a63..4656f32 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -1212,6 +1212,10 @@
     <!-- Whether UI for multi user should be shown -->
     <bool name="config_enableMultiUserUI">false</bool>
 
+    <!-- If true, then we do not ask user for permission for apps to connect to USB devices.
+         Do not set this to true for production devices. Doing so will cause you to fail CTS. -->
+    <bool name="config_disableUsbPermissionDialogs">false</bool>
+
     <!-- Minimum span needed to begin a touch scaling gesture.
          If the span is equal to or greater than this size, a scaling gesture
          will begin, where supported. (See android.view.ScaleGestureDetector)
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 6624da4..efa873d 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -290,6 +290,7 @@
   <java-symbol type="bool" name="config_forceDefaultOrientation" />
   <java-symbol type="bool" name="config_wifi_batched_scan_supported" />
   <java-symbol type="bool" name="config_enableMultiUserUI"/>
+  <java-symbol type="bool" name="config_disableUsbPermissionDialogs"/>
 
   <java-symbol type="integer" name="config_cursorWindowSize" />
   <java-symbol type="integer" name="config_extraFreeKbytesAdjust" />
diff --git a/services/usb/java/com/android/server/usb/UsbSettingsManager.java b/services/usb/java/com/android/server/usb/UsbSettingsManager.java
index ff4857b..37b5c51 100644
--- a/services/usb/java/com/android/server/usb/UsbSettingsManager.java
+++ b/services/usb/java/com/android/server/usb/UsbSettingsManager.java
@@ -27,6 +27,7 @@ import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.ResolveInfo;
+import android.content.res.Resources;
 import android.content.res.XmlResourceParser;
 import android.hardware.usb.UsbAccessory;
 import android.hardware.usb.UsbDevice;
@@ -73,6 +74,7 @@ class UsbSettingsManager {
 
     private final UserHandle mUser;
     private final AtomicFile mSettingsFile;
+    private final boolean mDisablePermissionDialogs;
 
     private final Context mContext;
     private final Context mUserContext;
@@ -510,6 +512,9 @@ class UsbSettingsManager {
                 Environment.getUserSystemDirectory(user.getIdentifier()),
                 "usb_device_manager.xml"));
 
+        mDisablePermissionDialogs = context.getResources().getBoolean(
+                com.android.internal.R.bool.config_disableUsbPermissionDialogs);
+
         synchronized (mLock) {
             if (UserHandle.OWNER.equals(user)) {
                 upgradeSingleUserLocked();
@@ -815,6 +820,14 @@ class UsbSettingsManager {
                     (rInfo.activityInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
                 defaultRI = rInfo;
             }
+
+            if (mDisablePermissionDialogs) {
+                // bypass dialog and launch the only matching activity
+                rInfo = matches.get(0);
+                if (rInfo.activityInfo != null) {
+                    defaultPackage = rInfo.activityInfo.packageName;
+                }
+            }
         }
 
         if (defaultRI == null && defaultPackage != null) {
@@ -970,7 +983,7 @@ class UsbSettingsManager {
     public boolean hasPermission(UsbDevice device) {
         synchronized (mLock) {
             int uid = Binder.getCallingUid();
-            if (uid == Process.SYSTEM_UID) {
+            if (uid == Process.SYSTEM_UID || mDisablePermissionDialogs) {
                 return true;
             }
             SparseBooleanArray uidList = mDevicePermissionMap.get(device.getDeviceName());
@@ -984,7 +997,7 @@ class UsbSettingsManager {
     public boolean hasPermission(UsbAccessory accessory) {
         synchronized (mLock) {
             int uid = Binder.getCallingUid();
-            if (uid == Process.SYSTEM_UID) {
+            if (uid == Process.SYSTEM_UID || mDisablePermissionDialogs) {
                 return true;
             }
             SparseBooleanArray uidList = mAccessoryPermissionMap.get(accessory);