diff --git a/thermal/2.0/default/Thermal.h b/thermal/2.0/default/Thermal.h
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+/*
+ * Copyright (C) 2018 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_HARDWARE_THERMAL_V2_0_THERMAL_H
+#define ANDROID_HARDWARE_THERMAL_V2_0_THERMAL_H
+
+#include <android/hardware/thermal/2.0/IThermal.h>
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+
+namespace android {
+namespace hardware {
+namespace thermal {
+namespace V2_0 {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_array;
+using ::android::hardware::hidl_memory;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::thermal::V1_0::CpuUsage;
+using ::android::hardware::thermal::V2_0::CoolingType;
+using ::android::hardware::thermal::V2_0::IThermal;
+using CoolingDevice_1_0 = ::android::hardware::thermal::V1_0::CoolingDevice;
+using CoolingDevice_2_0 = ::android::hardware::thermal::V2_0::CoolingDevice;
+using Temperature_1_0 = ::android::hardware::thermal::V1_0::Temperature;
+using Temperature_2_0 = ::android::hardware::thermal::V2_0::Temperature;
+using ::android::hardware::thermal::V2_0::IThermalChangedCallback;
+using ::android::hardware::thermal::V2_0::TemperatureThreshold;
+using ::android::hardware::thermal::V2_0::TemperatureType;
+
+struct CallbackSetting {
+    CallbackSetting(sp<IThermalChangedCallback> callback, bool is_filter_type, TemperatureType type)
+        : callback(callback), is_filter_type(is_filter_type), type(type) {}
+    sp<IThermalChangedCallback> callback;
+    bool is_filter_type;
+    TemperatureType type;
+};
+
+class Thermal : public IThermal {
+   public:
+    // Methods from ::android::hardware::thermal::V1_0::IThermal follow.
+    Return<void> getTemperatures(getTemperatures_cb _hidl_cb) override;
+    Return<void> getCpuUsages(getCpuUsages_cb _hidl_cb) override;
+    Return<void> getCoolingDevices(getCoolingDevices_cb _hidl_cb) override;
+
+    // Methods from ::android::hardware::thermal::V2_0::IThermal follow.
+    Return<void> getCurrentTemperatures(bool filterType, TemperatureType type,
+                                        getCurrentTemperatures_cb _hidl_cb) override;
+    Return<void> getTemperatureThresholds(bool filterType, TemperatureType type,
+                                          getTemperatureThresholds_cb _hidl_cb) override;
+    Return<void> registerThermalChangedCallback(
+        const sp<IThermalChangedCallback>& callback, bool filterType, TemperatureType type,
+        registerThermalChangedCallback_cb _hidl_cb) override;
+    Return<void> unregisterThermalChangedCallback(
+        const sp<IThermalChangedCallback>& callback,
+        unregisterThermalChangedCallback_cb _hidl_cb) override;
+    Return<void> getCurrentCoolingDevices(bool filterType, CoolingType type,
+                                          getCurrentCoolingDevices_cb _hidl_cb) override;
+
+   private:
+    std::mutex thermal_callback_mutex_;
+    std::vector<CallbackSetting> callbacks_;
+};
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace thermal
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_THERMAL_V2_0_THERMAL_H