diff --git a/include/utils/IInterface.h b/include/utils/IInterface.h
new file mode 100644
index 0000000..959722a
--- /dev/null
+++ b/include/utils/IInterface.h
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2005 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.
+ */
+
+//
+#ifndef ANDROID_IINTERFACE_H
+#define ANDROID_IINTERFACE_H
+
+#include <utils/Binder.h>
+
+namespace android {
+
+// ----------------------------------------------------------------------
+
+class IInterface : public virtual RefBase
+{
+public:
+            sp<IBinder>         asBinder();
+            sp<const IBinder>   asBinder() const;
+
+protected:
+    virtual IBinder*            onAsBinder() = 0;
+};
+
+// ----------------------------------------------------------------------
+
+template<typename INTERFACE>
+inline sp<INTERFACE> interface_cast(const sp<IBinder>& obj)
+{
+    return INTERFACE::asInterface(obj);
+}
+
+// ----------------------------------------------------------------------
+
+template<typename INTERFACE>
+class BnInterface : public INTERFACE, public BBinder
+{
+public:
+    virtual sp<IInterface>      queryLocalInterface(const String16& _descriptor);
+    virtual String16            getInterfaceDescriptor() const;
+
+protected:
+    virtual IBinder*            onAsBinder();
+};
+
+// ----------------------------------------------------------------------
+
+template<typename INTERFACE>
+class BpInterface : public INTERFACE, public BpRefBase
+{
+public:
+                                BpInterface(const sp<IBinder>& remote);
+
+protected:
+    virtual IBinder*            onAsBinder();
+};
+
+// ----------------------------------------------------------------------
+
+#define DECLARE_META_INTERFACE(INTERFACE)                               \
+    static const String16 descriptor;                                   \
+    static sp<I##INTERFACE> asInterface(const sp<IBinder>& obj);        \
+    virtual String16 getInterfaceDescriptor() const;                    \
+
+#define IMPLEMENT_META_INTERFACE(INTERFACE, NAME)                       \
+    const String16 I##INTERFACE::descriptor(NAME);                      \
+    String16 I##INTERFACE::getInterfaceDescriptor() const {             \
+        return I##INTERFACE::descriptor;                                \
+    }                                                                   \
+    sp<I##INTERFACE> I##INTERFACE::asInterface(const sp<IBinder>& obj)  \
+    {                                                                   \
+        sp<I##INTERFACE> intr;                                          \
+        if (obj != NULL) {                                              \
+            intr = static_cast<I##INTERFACE*>(                          \
+                obj->queryLocalInterface(                               \
+                        I##INTERFACE::descriptor).get());               \
+            if (intr == NULL) {                                         \
+                intr = new Bp##INTERFACE(obj);                          \
+            }                                                           \
+        }                                                               \
+        return intr;                                                    \
+    }                                                                   \
+
+// ----------------------------------------------------------------------
+// No user-servicable parts after this...
+
+template<typename INTERFACE>
+inline sp<IInterface> BnInterface<INTERFACE>::queryLocalInterface(
+        const String16& _descriptor)
+{
+    if (_descriptor == INTERFACE::descriptor) return this;
+    return NULL;
+}
+
+template<typename INTERFACE>
+inline String16 BnInterface<INTERFACE>::getInterfaceDescriptor() const
+{
+    return INTERFACE::getInterfaceDescriptor();
+}
+
+template<typename INTERFACE>
+IBinder* BnInterface<INTERFACE>::onAsBinder()
+{
+    return this;
+}
+
+template<typename INTERFACE>
+inline BpInterface<INTERFACE>::BpInterface(const sp<IBinder>& remote)
+    : BpRefBase(remote)
+{
+}
+
+template<typename INTERFACE>
+inline IBinder* BpInterface<INTERFACE>::onAsBinder()
+{
+    return remote();
+}
+    
+// ----------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_IINTERFACE_H