diff --git a/wifi/1.5/default/wifi.cpp b/wifi/1.5/default/wifi.cpp
new file mode 100644
index 0000000..c4e2333
--- /dev/null
+++ b/wifi/1.5/default/wifi.cpp
@@ -0,0 +1,235 @@
+/*
+ * 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.
+ */
+
+#include <android-base/logging.h>
+
+#include "hidl_return_util.h"
+#include "wifi.h"
+#include "wifi_status_util.h"
+
+namespace {
+// Chip ID to use for the only supported chip.
+static constexpr android::hardware::wifi::V1_0::ChipId kChipId = 0;
+}  // namespace
+
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace V1_5 {
+namespace implementation {
+using hidl_return_util::validateAndCall;
+using hidl_return_util::validateAndCallWithLock;
+
+Wifi::Wifi(
+    const std::shared_ptr<wifi_system::InterfaceTool> iface_tool,
+    const std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
+    const std::shared_ptr<mode_controller::WifiModeController> mode_controller,
+    const std::shared_ptr<iface_util::WifiIfaceUtil> iface_util,
+    const std::shared_ptr<feature_flags::WifiFeatureFlags> feature_flags)
+    : iface_tool_(iface_tool),
+      legacy_hal_(legacy_hal),
+      mode_controller_(mode_controller),
+      iface_util_(iface_util),
+      feature_flags_(feature_flags),
+      run_state_(RunState::STOPPED) {}
+
+bool Wifi::isValid() {
+    // This object is always valid.
+    return true;
+}
+
+Return<void> Wifi::registerEventCallback(
+    const sp<IWifiEventCallback>& event_callback,
+    registerEventCallback_cb hidl_status_cb) {
+    return validateAndCall(this, WifiStatusCode::ERROR_UNKNOWN,
+                           &Wifi::registerEventCallbackInternal, hidl_status_cb,
+                           event_callback);
+}
+
+Return<bool> Wifi::isStarted() { return run_state_ != RunState::STOPPED; }
+
+Return<void> Wifi::start(start_cb hidl_status_cb) {
+    return validateAndCall(this, WifiStatusCode::ERROR_UNKNOWN,
+                           &Wifi::startInternal, hidl_status_cb);
+}
+
+Return<void> Wifi::stop(stop_cb hidl_status_cb) {
+    return validateAndCallWithLock(this, WifiStatusCode::ERROR_UNKNOWN,
+                                   &Wifi::stopInternal, hidl_status_cb);
+}
+
+Return<void> Wifi::getChipIds(getChipIds_cb hidl_status_cb) {
+    return validateAndCall(this, WifiStatusCode::ERROR_UNKNOWN,
+                           &Wifi::getChipIdsInternal, hidl_status_cb);
+}
+
+Return<void> Wifi::getChip(ChipId chip_id, getChip_cb hidl_status_cb) {
+    return validateAndCall(this, WifiStatusCode::ERROR_UNKNOWN,
+                           &Wifi::getChipInternal, hidl_status_cb, chip_id);
+}
+
+Return<void> Wifi::debug(const hidl_handle& handle,
+                         const hidl_vec<hidl_string>&) {
+    LOG(INFO) << "-----------Debug is called----------------";
+    if (!chip_.get()) {
+        return Void();
+    }
+    return chip_->debug(handle, {});
+}
+
+WifiStatus Wifi::registerEventCallbackInternal(
+    const sp<IWifiEventCallback>& event_callback) {
+    if (!event_cb_handler_.addCallback(event_callback)) {
+        return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
+    }
+    return createWifiStatus(WifiStatusCode::SUCCESS);
+}
+
+WifiStatus Wifi::startInternal() {
+    if (run_state_ == RunState::STARTED) {
+        return createWifiStatus(WifiStatusCode::SUCCESS);
+    } else if (run_state_ == RunState::STOPPING) {
+        return createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE,
+                                "HAL is stopping");
+    }
+    WifiStatus wifi_status = initializeModeControllerAndLegacyHal();
+    if (wifi_status.code == WifiStatusCode::SUCCESS) {
+        // Register the callback for subsystem restart
+        const auto& on_subsystem_restart_callback =
+            [this](const std::string& error) {
+                WifiStatus wifi_status =
+                    createWifiStatus(WifiStatusCode::ERROR_UNKNOWN, error);
+                for (const auto& callback : event_cb_handler_.getCallbacks()) {
+                    if (!callback->onFailure(wifi_status).isOk()) {
+                        LOG(ERROR) << "Failed to invoke onFailure callback";
+                    }
+                }
+            };
+
+        // Create the chip instance once the HAL is started.
+        // Need to consider the case of multiple chips TODO(156998862)
+        chip_ =
+            new WifiChip(kChipId, legacy_hal_, mode_controller_, iface_util_,
+                         feature_flags_, on_subsystem_restart_callback);
+        run_state_ = RunState::STARTED;
+        for (const auto& callback : event_cb_handler_.getCallbacks()) {
+            if (!callback->onStart().isOk()) {
+                LOG(ERROR) << "Failed to invoke onStart callback";
+            };
+        }
+        LOG(INFO) << "Wifi HAL started";
+    } else {
+        for (const auto& callback : event_cb_handler_.getCallbacks()) {
+            if (!callback->onFailure(wifi_status).isOk()) {
+                LOG(ERROR) << "Failed to invoke onFailure callback";
+            }
+        }
+        LOG(ERROR) << "Wifi HAL start failed";
+        // Clear the event callback objects since the HAL start failed.
+        event_cb_handler_.invalidate();
+    }
+    return wifi_status;
+}
+
+WifiStatus Wifi::stopInternal(
+    /* NONNULL */ std::unique_lock<std::recursive_mutex>* lock) {
+    if (run_state_ == RunState::STOPPED) {
+        return createWifiStatus(WifiStatusCode::SUCCESS);
+    } else if (run_state_ == RunState::STOPPING) {
+        return createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE,
+                                "HAL is stopping");
+    }
+    // Clear the chip object and its child objects since the HAL is now
+    // stopped.
+    if (chip_.get()) {
+        chip_->invalidate();
+        chip_.clear();
+    }
+    WifiStatus wifi_status = stopLegacyHalAndDeinitializeModeController(lock);
+    if (wifi_status.code == WifiStatusCode::SUCCESS) {
+        for (const auto& callback : event_cb_handler_.getCallbacks()) {
+            if (!callback->onStop().isOk()) {
+                LOG(ERROR) << "Failed to invoke onStop callback";
+            };
+        }
+        LOG(INFO) << "Wifi HAL stopped";
+    } else {
+        for (const auto& callback : event_cb_handler_.getCallbacks()) {
+            if (!callback->onFailure(wifi_status).isOk()) {
+                LOG(ERROR) << "Failed to invoke onFailure callback";
+            }
+        }
+        LOG(ERROR) << "Wifi HAL stop failed";
+    }
+    // Clear the event callback objects since the HAL is now stopped.
+    event_cb_handler_.invalidate();
+    return wifi_status;
+}
+
+std::pair<WifiStatus, std::vector<ChipId>> Wifi::getChipIdsInternal() {
+    std::vector<ChipId> chip_ids;
+    if (chip_.get()) {
+        chip_ids.emplace_back(kChipId);
+    }
+    return {createWifiStatus(WifiStatusCode::SUCCESS), std::move(chip_ids)};
+}
+
+std::pair<WifiStatus, sp<V1_4::IWifiChip>> Wifi::getChipInternal(
+    ChipId chip_id) {
+    if (!chip_.get()) {
+        return {createWifiStatus(WifiStatusCode::ERROR_NOT_STARTED), nullptr};
+    }
+    if (chip_id != kChipId) {
+        return {createWifiStatus(WifiStatusCode::ERROR_INVALID_ARGS), nullptr};
+    }
+    return {createWifiStatus(WifiStatusCode::SUCCESS), chip_};
+}
+
+WifiStatus Wifi::initializeModeControllerAndLegacyHal() {
+    if (!mode_controller_->initialize()) {
+        LOG(ERROR) << "Failed to initialize firmware mode controller";
+        return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
+    }
+    legacy_hal::wifi_error legacy_status = legacy_hal_->initialize();
+    if (legacy_status != legacy_hal::WIFI_SUCCESS) {
+        LOG(ERROR) << "Failed to initialize legacy HAL: "
+                   << legacyErrorToString(legacy_status);
+        return createWifiStatusFromLegacyError(legacy_status);
+    }
+    return createWifiStatus(WifiStatusCode::SUCCESS);
+}
+
+WifiStatus Wifi::stopLegacyHalAndDeinitializeModeController(
+    /* NONNULL */ std::unique_lock<std::recursive_mutex>* lock) {
+    run_state_ = RunState::STOPPING;
+    legacy_hal::wifi_error legacy_status =
+        legacy_hal_->stop(lock, [&]() { run_state_ = RunState::STOPPED; });
+    if (legacy_status != legacy_hal::WIFI_SUCCESS) {
+        LOG(ERROR) << "Failed to stop legacy HAL: "
+                   << legacyErrorToString(legacy_status);
+        return createWifiStatusFromLegacyError(legacy_status);
+    }
+    if (!mode_controller_->deinitialize()) {
+        LOG(ERROR) << "Failed to deinitialize firmware mode controller";
+        return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
+    }
+    return createWifiStatus(WifiStatusCode::SUCCESS);
+}
+}  // namespace implementation
+}  // namespace V1_5
+}  // namespace wifi
+}  // namespace hardware
+}  // namespace android