diff --git a/wifi/1.2/default/wifi.h b/wifi/1.2/default/wifi.h
new file mode 100644
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+++ b/wifi/1.2/default/wifi.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2016 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 WIFI_H_
+#define WIFI_H_
+
+#include <functional>
+
+#include <android-base/macros.h>
+#include <android/hardware/wifi/1.2/IWifi.h>
+#include <utils/Looper.h>
+
+#include "hidl_callback_util.h"
+#include "wifi_chip.h"
+#include "wifi_legacy_hal.h"
+#include "wifi_mode_controller.h"
+
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace V1_2 {
+namespace implementation {
+
+/**
+ * Root HIDL interface object used to control the Wifi HAL.
+ */
+class Wifi : public V1_2::IWifi {
+ public:
+  Wifi();
+
+  bool isValid();
+
+  // HIDL methods exposed.
+  Return<void> registerEventCallback(
+      const sp<IWifiEventCallback>& event_callback,
+      registerEventCallback_cb hidl_status_cb) override;
+  Return<bool> isStarted() override;
+  Return<void> start(start_cb hidl_status_cb) override;
+  Return<void> stop(stop_cb hidl_status_cb) override;
+  Return<void> getChipIds(getChipIds_cb hidl_status_cb) override;
+  Return<void> getChip(ChipId chip_id, getChip_cb hidl_status_cb) override;
+
+ private:
+  enum class RunState { STOPPED, STARTED, STOPPING };
+
+  // Corresponding worker functions for the HIDL methods.
+  WifiStatus registerEventCallbackInternal(
+      const sp<IWifiEventCallback>& event_callback);
+  WifiStatus startInternal();
+  WifiStatus stopInternal(std::unique_lock<std::recursive_mutex>* lock);
+  std::pair<WifiStatus, std::vector<ChipId>> getChipIdsInternal();
+  std::pair<WifiStatus, sp<IWifiChip>> getChipInternal(ChipId chip_id);
+
+  WifiStatus initializeLegacyHal();
+  WifiStatus stopLegacyHalAndDeinitializeModeController(
+      std::unique_lock<std::recursive_mutex>* lock);
+
+  // Instance is created in this root level |IWifi| HIDL interface object
+  // and shared with all the child HIDL interface objects.
+  std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
+  std::shared_ptr<mode_controller::WifiModeController> mode_controller_;
+  RunState run_state_;
+  sp<WifiChip> chip_;
+  hidl_callback_util::HidlCallbackHandler<IWifiEventCallback> event_cb_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(Wifi);
+};
+
+}  // namespace implementation
+}  // namespace V1_2
+}  // namespace wifi
+}  // namespace hardware
+}  // namespace android
+
+#endif  // WIFI_H_