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diff --git a/wifi/1.2/default/wifi_chip.h b/wifi/1.2/default/wifi_chip.h
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+++ b/wifi/1.2/default/wifi_chip.h
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+/*
+ * 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_CHIP_H_
+#define WIFI_CHIP_H_
+
+#include <map>
+
+#include <android-base/macros.h>
+#include <android/hardware/wifi/1.1/IWifiChip.h>
+
+#include "hidl_callback_util.h"
+#include "wifi_ap_iface.h"
+#include "wifi_legacy_hal.h"
+#include "wifi_mode_controller.h"
+#include "wifi_nan_iface.h"
+#include "wifi_p2p_iface.h"
+#include "wifi_rtt_controller.h"
+#include "wifi_sta_iface.h"
+
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace V1_2 {
+namespace implementation {
+using namespace android::hardware::wifi::V1_0;
+
+/**
+ * HIDL interface object used to control a Wifi HAL chip instance.
+ * Since there is only a single chip instance used today, there is no
+ * identifying handle information stored here.
+ */
+class WifiChip : public V1_1::IWifiChip {
+ public:
+  WifiChip(
+      ChipId chip_id,
+      const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
+      const std::weak_ptr<mode_controller::WifiModeController> mode_controller);
+  // HIDL does not provide a built-in mechanism to let the server invalidate
+  // a HIDL interface object after creation. If any client process holds onto
+  // a reference to the object in their context, any method calls on that
+  // reference will continue to be directed to the server.
+  //
+  // However Wifi HAL needs to control the lifetime of these objects. So, add
+  // a public |invalidate| method to |WifiChip| and it's child objects. This
+  // will be used to mark an object invalid when either:
+  // a) Wifi HAL is stopped, or
+  // b) Wifi Chip is reconfigured.
+  //
+  // All HIDL method implementations should check if the object is still marked
+  // valid before processing them.
+  void invalidate();
+  bool isValid();
+  std::set<sp<IWifiChipEventCallback>> getEventCallbacks();
+
+  // HIDL methods exposed.
+  Return<void> getId(getId_cb hidl_status_cb) override;
+  Return<void> registerEventCallback(
+      const sp<IWifiChipEventCallback>& event_callback,
+      registerEventCallback_cb hidl_status_cb) override;
+  Return<void> getCapabilities(getCapabilities_cb hidl_status_cb) override;
+  Return<void> getAvailableModes(getAvailableModes_cb hidl_status_cb) override;
+  Return<void> configureChip(ChipModeId mode_id,
+                             configureChip_cb hidl_status_cb) override;
+  Return<void> getMode(getMode_cb hidl_status_cb) override;
+  Return<void> requestChipDebugInfo(
+      requestChipDebugInfo_cb hidl_status_cb) override;
+  Return<void> requestDriverDebugDump(
+      requestDriverDebugDump_cb hidl_status_cb) override;
+  Return<void> requestFirmwareDebugDump(
+      requestFirmwareDebugDump_cb hidl_status_cb) override;
+  Return<void> createApIface(createApIface_cb hidl_status_cb) override;
+  Return<void> getApIfaceNames(getApIfaceNames_cb hidl_status_cb) override;
+  Return<void> getApIface(const hidl_string& ifname,
+                          getApIface_cb hidl_status_cb) override;
+  Return<void> removeApIface(const hidl_string& ifname,
+                             removeApIface_cb hidl_status_cb) override;
+  Return<void> createNanIface(createNanIface_cb hidl_status_cb) override;
+  Return<void> getNanIfaceNames(getNanIfaceNames_cb hidl_status_cb) override;
+  Return<void> getNanIface(const hidl_string& ifname,
+                           getNanIface_cb hidl_status_cb) override;
+  Return<void> removeNanIface(const hidl_string& ifname,
+                              removeNanIface_cb hidl_status_cb) override;
+  Return<void> createP2pIface(createP2pIface_cb hidl_status_cb) override;
+  Return<void> getP2pIfaceNames(getP2pIfaceNames_cb hidl_status_cb) override;
+  Return<void> getP2pIface(const hidl_string& ifname,
+                           getP2pIface_cb hidl_status_cb) override;
+  Return<void> removeP2pIface(const hidl_string& ifname,
+                              removeP2pIface_cb hidl_status_cb) override;
+  Return<void> createStaIface(createStaIface_cb hidl_status_cb) override;
+  Return<void> getStaIfaceNames(getStaIfaceNames_cb hidl_status_cb) override;
+  Return<void> getStaIface(const hidl_string& ifname,
+                           getStaIface_cb hidl_status_cb) override;
+  Return<void> removeStaIface(const hidl_string& ifname,
+                              removeStaIface_cb hidl_status_cb) override;
+  Return<void> createRttController(
+      const sp<IWifiIface>& bound_iface,
+      createRttController_cb hidl_status_cb) override;
+  Return<void> getDebugRingBuffersStatus(
+      getDebugRingBuffersStatus_cb hidl_status_cb) override;
+  Return<void> startLoggingToDebugRingBuffer(
+      const hidl_string& ring_name,
+      WifiDebugRingBufferVerboseLevel verbose_level,
+      uint32_t max_interval_in_sec,
+      uint32_t min_data_size_in_bytes,
+      startLoggingToDebugRingBuffer_cb hidl_status_cb) override;
+  Return<void> forceDumpToDebugRingBuffer(
+      const hidl_string& ring_name,
+      forceDumpToDebugRingBuffer_cb hidl_status_cb) override;
+  Return<void> stopLoggingToDebugRingBuffer(
+      stopLoggingToDebugRingBuffer_cb hidl_status_cb) override;
+  Return<void> getDebugHostWakeReasonStats(
+      getDebugHostWakeReasonStats_cb hidl_status_cb) override;
+  Return<void> enableDebugErrorAlerts(
+      bool enable, enableDebugErrorAlerts_cb hidl_status_cb) override;
+  Return<void> selectTxPowerScenario(
+      TxPowerScenario scenario,
+      selectTxPowerScenario_cb hidl_status_cb) override;
+  Return<void> resetTxPowerScenario(
+      resetTxPowerScenario_cb hidl_status_cb) override;
+
+ private:
+  void invalidateAndRemoveAllIfaces();
+
+  // Corresponding worker functions for the HIDL methods.
+  std::pair<WifiStatus, ChipId> getIdInternal();
+  WifiStatus registerEventCallbackInternal(
+      const sp<IWifiChipEventCallback>& event_callback);
+  std::pair<WifiStatus, uint32_t> getCapabilitiesInternal();
+  std::pair<WifiStatus, std::vector<ChipMode>> getAvailableModesInternal();
+  WifiStatus configureChipInternal(ChipModeId mode_id);
+  std::pair<WifiStatus, uint32_t> getModeInternal();
+  std::pair<WifiStatus, IWifiChip::ChipDebugInfo>
+  requestChipDebugInfoInternal();
+  std::pair<WifiStatus, std::vector<uint8_t>> requestDriverDebugDumpInternal();
+  std::pair<WifiStatus, std::vector<uint8_t>>
+  requestFirmwareDebugDumpInternal();
+  std::pair<WifiStatus, sp<IWifiApIface>> createApIfaceInternal();
+  std::pair<WifiStatus, std::vector<hidl_string>> getApIfaceNamesInternal();
+  std::pair<WifiStatus, sp<IWifiApIface>> getApIfaceInternal(
+      const std::string& ifname);
+  WifiStatus removeApIfaceInternal(const std::string& ifname);
+  std::pair<WifiStatus, sp<IWifiNanIface>> createNanIfaceInternal();
+  std::pair<WifiStatus, std::vector<hidl_string>> getNanIfaceNamesInternal();
+  std::pair<WifiStatus, sp<IWifiNanIface>> getNanIfaceInternal(
+      const std::string& ifname);
+  WifiStatus removeNanIfaceInternal(const std::string& ifname);
+  std::pair<WifiStatus, sp<IWifiP2pIface>> createP2pIfaceInternal();
+  std::pair<WifiStatus, std::vector<hidl_string>> getP2pIfaceNamesInternal();
+  std::pair<WifiStatus, sp<IWifiP2pIface>> getP2pIfaceInternal(
+      const std::string& ifname);
+  WifiStatus removeP2pIfaceInternal(const std::string& ifname);
+  std::pair<WifiStatus, sp<IWifiStaIface>> createStaIfaceInternal();
+  std::pair<WifiStatus, std::vector<hidl_string>> getStaIfaceNamesInternal();
+  std::pair<WifiStatus, sp<IWifiStaIface>> getStaIfaceInternal(
+      const std::string& ifname);
+  WifiStatus removeStaIfaceInternal(const std::string& ifname);
+  std::pair<WifiStatus, sp<IWifiRttController>> createRttControllerInternal(
+      const sp<IWifiIface>& bound_iface);
+  std::pair<WifiStatus, std::vector<WifiDebugRingBufferStatus>>
+  getDebugRingBuffersStatusInternal();
+  WifiStatus startLoggingToDebugRingBufferInternal(
+      const hidl_string& ring_name,
+      WifiDebugRingBufferVerboseLevel verbose_level,
+      uint32_t max_interval_in_sec,
+      uint32_t min_data_size_in_bytes);
+  WifiStatus forceDumpToDebugRingBufferInternal(const hidl_string& ring_name);
+  WifiStatus stopLoggingToDebugRingBufferInternal();
+  std::pair<WifiStatus, WifiDebugHostWakeReasonStats>
+  getDebugHostWakeReasonStatsInternal();
+  WifiStatus enableDebugErrorAlertsInternal(bool enable);
+  WifiStatus selectTxPowerScenarioInternal(TxPowerScenario scenario);
+  WifiStatus resetTxPowerScenarioInternal();
+
+  WifiStatus handleChipConfiguration(ChipModeId mode_id);
+  WifiStatus registerDebugRingBufferCallback();
+
+  ChipId chip_id_;
+  std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
+  std::weak_ptr<mode_controller::WifiModeController> mode_controller_;
+  sp<WifiApIface> ap_iface_;
+  sp<WifiNanIface> nan_iface_;
+  sp<WifiP2pIface> p2p_iface_;
+  sp<WifiStaIface> sta_iface_;
+  std::vector<sp<WifiRttController>> rtt_controllers_;
+  bool is_valid_;
+  uint32_t current_mode_id_;
+  // The legacy ring buffer callback API has only a global callback
+  // registration mechanism. Use this to check if we have already
+  // registered a callback.
+  bool debug_ring_buffer_cb_registered_;
+  hidl_callback_util::HidlCallbackHandler<IWifiChipEventCallback>
+      event_cb_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(WifiChip);
+};
+
+}  // namespace implementation
+}  // namespace V1_2
+}  // namespace wifi
+}  // namespace hardware
+}  // namespace android
+
+#endif  // WIFI_CHIP_H_