diff --git a/modules/input/evdev/InputMapper.h b/modules/input/evdev/InputMapper.h
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+++ b/modules/input/evdev/InputMapper.h
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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.
+ */
+
+#ifndef ANDROID_INPUT_MAPPER_H_
+#define ANDROID_INPUT_MAPPER_H_
+
+#include "InputHost.h"
+#include "InputHub.h"
+
+namespace android {
+
+/**
+ * An InputMapper processes raw evdev input events and combines them into
+ * Android input HAL reports. A given InputMapper will focus on a particular
+ * type of input, like key presses or touch events. A single InputDevice may
+ * have multiple InputMappers, corresponding to the different types of inputs it
+ * supports.
+ */
+class InputMapper {
+public:
+    virtual ~InputMapper() = default;
+
+    /**
+     * If the mapper supports input events from the InputDevice,
+     * configureInputReport will populate the InputReportDefinition and return
+     * true. If input is not supported, false is returned, and the InputDevice
+     * may free or re-use the InputReportDefinition.
+     */
+    virtual bool configureInputReport(InputDeviceNode* devNode, InputReportDefinition* report) {
+        return false;
+    }
+
+    /**
+     * If the mapper supports output events from the InputDevice,
+     * configureOutputReport will populate the InputReportDefinition and return
+     * true. If output is not supported, false is returned, and the InputDevice
+     * may free or re-use the InputReportDefinition.
+     */
+    virtual bool configureOutputReport(InputDeviceNode* devNode, InputReportDefinition* report) {
+        return false;
+    }
+
+    // Set the InputDeviceHandle after registering the device with the host.
+    virtual void setDeviceHandle(InputDeviceHandle* handle) { mDeviceHandle = handle; }
+    // Process the InputEvent.
+    virtual void process(const InputEvent& event) = 0;
+
+protected:
+    virtual void setInputReportDefinition(InputReportDefinition* reportDef) final {
+        mInputReportDef = reportDef;
+    }
+    virtual void setOutputReportDefinition(InputReportDefinition* reportDef) final {
+        mOutputReportDef = reportDef;
+    }
+    virtual InputReportDefinition* getInputReportDefinition() final { return mInputReportDef; }
+    virtual InputReportDefinition* getOutputReportDefinition() final { return mOutputReportDef; }
+    virtual InputDeviceHandle* getDeviceHandle() final { return mDeviceHandle; }
+    virtual InputReport* getInputReport() final;
+
+private:
+    InputReportDefinition* mInputReportDef = nullptr;
+    InputReportDefinition* mOutputReportDef = nullptr;
+    InputDeviceHandle* mDeviceHandle = nullptr;
+    InputReport* mReport = nullptr;
+};
+
+}  // namespace android
+
+#endif  // ANDROID_INPUT_MAPPER_H_