diff --git a/wifi/aidl/default/wifi.h b/wifi/aidl/default/wifi.h
new file mode 100644
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+++ b/wifi/aidl/default/wifi.h
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+/*
+ * Copyright (C) 2022 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 <aidl/android/hardware/wifi/BnWifi.h>
+#include <android-base/macros.h>
+#include <utils/Looper.h>
+
+#include <functional>
+
+#include "aidl_callback_util.h"
+#include "wifi_chip.h"
+#include "wifi_feature_flags.h"
+#include "wifi_legacy_hal.h"
+#include "wifi_legacy_hal_factory.h"
+#include "wifi_mode_controller.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace wifi {
+
+/**
+ * Root AIDL interface object used to control the Wifi HAL.
+ */
+class Wifi : public BnWifi {
+  public:
+    Wifi(const std::shared_ptr<::android::wifi_system::InterfaceTool> iface_tool,
+         const std::shared_ptr<legacy_hal::WifiLegacyHalFactory> legacy_hal_factory,
+         const std::shared_ptr<mode_controller::WifiModeController> mode_controller,
+         const std::shared_ptr<feature_flags::WifiFeatureFlags> feature_flags);
+
+    bool isValid();
+
+    // AIDL methods exposed.
+    ndk::ScopedAStatus registerEventCallback(
+            const std::shared_ptr<IWifiEventCallback>& in_callback) override;
+    ndk::ScopedAStatus isStarted(bool* _aidl_return) override;
+    ndk::ScopedAStatus start() override;
+    ndk::ScopedAStatus stop() override;
+    ndk::ScopedAStatus getChipIds(std::vector<int32_t>* _aidl_return) override;
+    ndk::ScopedAStatus getChip(int32_t in_chipId,
+                               std::shared_ptr<IWifiChip>* _aidl_return) override;
+    binder_status_t dump(int fd, const char** args, uint32_t numArgs) override;
+
+  private:
+    enum class RunState { STOPPED, STARTED, STOPPING };
+
+    // Corresponding worker functions for the AIDL methods.
+    ndk::ScopedAStatus registerEventCallbackInternal(
+            const std::shared_ptr<IWifiEventCallback>& event_callback __unused);
+    ndk::ScopedAStatus startInternal();
+    ndk::ScopedAStatus stopInternal(std::unique_lock<std::recursive_mutex>* lock);
+    std::pair<std::vector<int32_t>, ndk::ScopedAStatus> getChipIdsInternal();
+    std::pair<std::shared_ptr<IWifiChip>, ndk::ScopedAStatus> getChipInternal(int32_t chip_id);
+
+    ndk::ScopedAStatus initializeModeControllerAndLegacyHal();
+    ndk::ScopedAStatus stopLegacyHalAndDeinitializeModeController(
+            std::unique_lock<std::recursive_mutex>* lock);
+    int32_t getChipIdFromWifiChip(std::shared_ptr<WifiChip>& chip);
+
+    // Instance is created in this root level |IWifi| AIDL interface object
+    // and shared with all the child AIDL interface objects.
+    std::shared_ptr<::android::wifi_system::InterfaceTool> iface_tool_;
+    std::shared_ptr<legacy_hal::WifiLegacyHalFactory> legacy_hal_factory_;
+    std::shared_ptr<mode_controller::WifiModeController> mode_controller_;
+    std::vector<std::shared_ptr<legacy_hal::WifiLegacyHal>> legacy_hals_;
+    std::shared_ptr<feature_flags::WifiFeatureFlags> feature_flags_;
+    RunState run_state_;
+    std::vector<std::shared_ptr<WifiChip>> chips_;
+    aidl_callback_util::AidlCallbackHandler<IWifiEventCallback> event_cb_handler_;
+
+    DISALLOW_COPY_AND_ASSIGN(Wifi);
+};
+
+}  // namespace wifi
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
+
+#endif  // WIFI_H_