diff --git a/wifi/1.4/Android.bp b/wifi/1.4/Android.bp
index 5750e42..e63b1eb 100644
--- a/wifi/1.4/Android.bp
+++ b/wifi/1.4/Android.bp
@@ -11,6 +11,7 @@
         "IWifi.hal",
         "IWifiApIface.hal",
         "IWifiChip.hal",
+        "IWifiChipEventCallback.hal",
         "IWifiRttController.hal",
         "IWifiRttControllerEventCallback.hal",
         "IWifiStaIface.hal",
diff --git a/wifi/1.4/IWifiChip.hal b/wifi/1.4/IWifiChip.hal
index d269427..de5a64e 100644
--- a/wifi/1.4/IWifiChip.hal
+++ b/wifi/1.4/IWifiChip.hal
@@ -19,6 +19,7 @@
 import @1.0::WifiStatus;
 import @1.0::IWifiIface;
 import @1.3::IWifiChip;
+import IWifiChipEventCallback;
 import IWifiRttController;
 
 /**
@@ -26,6 +27,22 @@
  */
 interface IWifiChip extends @1.3::IWifiChip {
     /**
+     * Requests notifications of significant events on this chip. Multiple calls
+     * to this must register multiple callbacks each of which must receive all
+     * events.
+     *
+     * @param callback An instance of the |IWifiChipEventCallback| HIDL interface
+     *        object.
+     * @return status WifiStatus of the operation.
+     *         Possible status codes:
+     *         |WifiStatusCode.SUCCESS|,
+     *         |WifiStatusCode.ERROR_NOT_SUPPORTED|,
+     *         |WifiStatusCode.ERROR_WIFI_CHIP_INVALID|
+     */
+    registerEventCallback_1_4(IWifiChipEventCallback callback)
+        generates (WifiStatus status);
+
+    /**
      * Create a RTTController instance.
      *
      * RTT controller can be either:
diff --git a/wifi/1.4/IWifiChipEventCallback.hal b/wifi/1.4/IWifiChipEventCallback.hal
new file mode 100644
index 0000000..ecd0a44
--- /dev/null
+++ b/wifi/1.4/IWifiChipEventCallback.hal
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2019 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.
+ */
+
+package android.hardware.wifi@1.4;
+
+import @1.2::IWifiChipEventCallback;
+import WifiBand;
+
+/**
+ * Wifi chip event callbacks.
+ */
+interface IWifiChipEventCallback extends @1.2::IWifiChipEventCallback {
+    /**
+     * Struct describing the state of each hardware radio chain (hardware MAC)
+     * on the device.
+     */
+    struct RadioModeInfo {
+        /**
+         * Identifier for this radio chain. This is vendor dependent & used
+         * only for debugging purposes.
+         */
+        uint32_t radioId;
+        /**
+         * List of bands on which this radio chain is operating.
+         * Can be one of:
+         * a) WifiBand.BAND_24GHZ => 2.4Ghz.
+         * b) WifiBand.BAND_5GHZ => 5Ghz.
+         * c) WifiBand.BAND_24GHZ_5GHZ = 2.4Ghz + 5Ghz (Radio is time sharing
+         * across the 2 bands).
+         * d) WifiBand.BAND_6GHZ => 6Ghz.
+         * e) WifiBand.BAND_5GHZ_6GHZ => 5Ghz + 6Ghz (Radio is time sharing
+         * across the 2 bands).
+         * f) WifiBand.BAND_24GHZ_5GHZ_6GHZ => 2.4Ghz + 5Ghz + 6Ghz (Radio is
+         * time sharing across the 3 bands).
+         */
+        WifiBand bandInfo;
+        /** List of interfaces on this radio chain (hardware MAC). */
+        vec<IfaceInfo> ifaceInfos;
+    };
+
+    /**
+     * Asynchronous callback indicating a radio mode change.
+     * Radio mode change could be a result of:
+     * a) Bringing up concurrent interfaces (For ex: STA + AP).
+     * b) Change in operating band of one of the concurrent interfaces (For ex:
+     * STA connection moved from 2.4G to 5G)
+     *
+     * @param radioModeInfos List of RadioModeInfo structures for each
+     * radio chain (hardware MAC) on the device.
+     */
+    oneway onRadioModeChange_1_4(vec<RadioModeInfo> radioModeInfos);
+};
diff --git a/wifi/1.4/default/hidl_struct_util.cpp b/wifi/1.4/default/hidl_struct_util.cpp
index 6eeb642..35c6839 100644
--- a/wifi/1.4/default/hidl_struct_util.cpp
+++ b/wifi/1.4/default/hidl_struct_util.cpp
@@ -316,7 +316,7 @@
 
 bool convertLegacyWifiMacInfoToHidl(
     const legacy_hal::WifiMacInfo& legacy_mac_info,
-    V1_2::IWifiChipEventCallback::RadioModeInfo* hidl_radio_mode_info) {
+    IWifiChipEventCallback::RadioModeInfo* hidl_radio_mode_info) {
     if (!hidl_radio_mode_info) {
         return false;
     }
@@ -325,8 +325,17 @@
     hidl_radio_mode_info->radioId = legacy_mac_info.wlan_mac_id;
     // Convert from bitmask of bands in the legacy HAL to enum value in
     // the HIDL interface.
-    if (legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_2_4_BAND &&
-        legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_5_0_BAND) {
+    if (legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_6_0_BAND &&
+        legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_5_0_BAND &&
+        legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_2_4_BAND) {
+        hidl_radio_mode_info->bandInfo = WifiBand::BAND_24GHZ_5GHZ_6GHZ;
+    } else if (legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_6_0_BAND &&
+               legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_5_0_BAND) {
+        hidl_radio_mode_info->bandInfo = WifiBand::BAND_5GHZ_6GHZ;
+    } else if (legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_6_0_BAND) {
+        hidl_radio_mode_info->bandInfo = WifiBand::BAND_6GHZ;
+    } else if (legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_2_4_BAND &&
+               legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_5_0_BAND) {
         hidl_radio_mode_info->bandInfo = WifiBand::BAND_24GHZ_5GHZ;
     } else if (legacy_mac_info.mac_band & legacy_hal::WLAN_MAC_2_4_BAND) {
         hidl_radio_mode_info->bandInfo = WifiBand::BAND_24GHZ;
@@ -348,15 +357,14 @@
 
 bool convertLegacyWifiMacInfosToHidl(
     const std::vector<legacy_hal::WifiMacInfo>& legacy_mac_infos,
-    std::vector<V1_2::IWifiChipEventCallback::RadioModeInfo>*
-        hidl_radio_mode_infos) {
+    std::vector<IWifiChipEventCallback::RadioModeInfo>* hidl_radio_mode_infos) {
     if (!hidl_radio_mode_infos) {
         return false;
     }
     *hidl_radio_mode_infos = {};
 
     for (const auto& legacy_mac_info : legacy_mac_infos) {
-        V1_2::IWifiChipEventCallback::RadioModeInfo hidl_radio_mode_info;
+        IWifiChipEventCallback::RadioModeInfo hidl_radio_mode_info;
         if (!convertLegacyWifiMacInfoToHidl(legacy_mac_info,
                                             &hidl_radio_mode_info)) {
             return false;
@@ -449,21 +457,21 @@
     return true;
 }
 
-legacy_hal::wifi_band convertHidlWifiBandToLegacy(WifiBand band) {
+legacy_hal::wifi_band convertHidlWifiBandToLegacy(V1_0::WifiBand band) {
     switch (band) {
-        case WifiBand::BAND_UNSPECIFIED:
+        case V1_0::WifiBand::BAND_UNSPECIFIED:
             return legacy_hal::WIFI_BAND_UNSPECIFIED;
-        case WifiBand::BAND_24GHZ:
+        case V1_0::WifiBand::BAND_24GHZ:
             return legacy_hal::WIFI_BAND_BG;
-        case WifiBand::BAND_5GHZ:
+        case V1_0::WifiBand::BAND_5GHZ:
             return legacy_hal::WIFI_BAND_A;
-        case WifiBand::BAND_5GHZ_DFS:
+        case V1_0::WifiBand::BAND_5GHZ_DFS:
             return legacy_hal::WIFI_BAND_A_DFS;
-        case WifiBand::BAND_5GHZ_WITH_DFS:
+        case V1_0::WifiBand::BAND_5GHZ_WITH_DFS:
             return legacy_hal::WIFI_BAND_A_WITH_DFS;
-        case WifiBand::BAND_24GHZ_5GHZ:
+        case V1_0::WifiBand::BAND_24GHZ_5GHZ:
             return legacy_hal::WIFI_BAND_ABG;
-        case WifiBand::BAND_24GHZ_5GHZ_WITH_DFS:
+        case V1_0::WifiBand::BAND_24GHZ_5GHZ_WITH_DFS:
             return legacy_hal::WIFI_BAND_ABG_WITH_DFS;
     };
     CHECK(false);
diff --git a/wifi/1.4/default/hidl_struct_util.h b/wifi/1.4/default/hidl_struct_util.h
index cfaa4ad..987891b 100644
--- a/wifi/1.4/default/hidl_struct_util.h
+++ b/wifi/1.4/default/hidl_struct_util.h
@@ -21,10 +21,10 @@
 
 #include <android/hardware/wifi/1.0/IWifiChip.h>
 #include <android/hardware/wifi/1.0/types.h>
-#include <android/hardware/wifi/1.2/IWifiChipEventCallback.h>
 #include <android/hardware/wifi/1.2/types.h>
 #include <android/hardware/wifi/1.3/IWifiChip.h>
 #include <android/hardware/wifi/1.3/types.h>
+#include <android/hardware/wifi/1.4/IWifiChipEventCallback.h>
 #include <android/hardware/wifi/1.4/IWifiStaIface.h>
 #include <android/hardware/wifi/1.4/types.h>
 
@@ -65,8 +65,7 @@
     V1_2::IWifiChip::TxPowerScenario hidl_scenario);
 bool convertLegacyWifiMacInfosToHidl(
     const std::vector<legacy_hal::WifiMacInfo>& legacy_mac_infos,
-    std::vector<V1_2::IWifiChipEventCallback::RadioModeInfo>*
-        hidl_radio_mode_infos);
+    std::vector<IWifiChipEventCallback::RadioModeInfo>* hidl_radio_mode_infos);
 
 // STA iface conversion methods.
 bool convertLegacyFeaturesToHidlStaCapabilities(
@@ -78,7 +77,7 @@
 bool convertLegacyGscanCapabilitiesToHidl(
     const legacy_hal::wifi_gscan_capabilities& legacy_caps,
     StaBackgroundScanCapabilities* hidl_caps);
-legacy_hal::wifi_band convertHidlWifiBandToLegacy(WifiBand band);
+legacy_hal::wifi_band convertHidlWifiBandToLegacy(V1_0::WifiBand band);
 bool convertHidlGscanParamsToLegacy(
     const StaBackgroundScanParameters& hidl_scan_params,
     legacy_hal::wifi_scan_cmd_params* legacy_scan_params);
diff --git a/wifi/1.4/default/tests/hidl_struct_util_unit_tests.cpp b/wifi/1.4/default/tests/hidl_struct_util_unit_tests.cpp
index 14a1504..b71d549 100644
--- a/wifi/1.4/default/tests/hidl_struct_util_unit_tests.cpp
+++ b/wifi/1.4/default/tests/hidl_struct_util_unit_tests.cpp
@@ -55,8 +55,7 @@
     legacy_mac_info1.iface_infos.push_back(legacy_iface_info2);
     legacy_mac_infos.push_back(legacy_mac_info1);
 
-    std::vector<V1_2::IWifiChipEventCallback::RadioModeInfo>
-        hidl_radio_mode_infos;
+    std::vector<IWifiChipEventCallback::RadioModeInfo> hidl_radio_mode_infos;
     ASSERT_TRUE(hidl_struct_util::convertLegacyWifiMacInfosToHidl(
         legacy_mac_infos, &hidl_radio_mode_infos));
 
@@ -90,20 +89,18 @@
     legacy_mac_info2.iface_infos.push_back(legacy_iface_info2);
     legacy_mac_infos.push_back(legacy_mac_info2);
 
-    std::vector<V1_2::IWifiChipEventCallback::RadioModeInfo>
-        hidl_radio_mode_infos;
+    std::vector<IWifiChipEventCallback::RadioModeInfo> hidl_radio_mode_infos;
     ASSERT_TRUE(hidl_struct_util::convertLegacyWifiMacInfosToHidl(
         legacy_mac_infos, &hidl_radio_mode_infos));
 
     ASSERT_EQ(2u, hidl_radio_mode_infos.size());
 
     // Find mac info 1.
-    const auto hidl_radio_mode_info1 =
-        std::find_if(hidl_radio_mode_infos.begin(), hidl_radio_mode_infos.end(),
-                     [&legacy_mac_info1](
-                         const V1_2::IWifiChipEventCallback::RadioModeInfo& x) {
-                         return x.radioId == legacy_mac_info1.wlan_mac_id;
-                     });
+    const auto hidl_radio_mode_info1 = std::find_if(
+        hidl_radio_mode_infos.begin(), hidl_radio_mode_infos.end(),
+        [&legacy_mac_info1](const IWifiChipEventCallback::RadioModeInfo& x) {
+            return x.radioId == legacy_mac_info1.wlan_mac_id;
+        });
     ASSERT_NE(hidl_radio_mode_infos.end(), hidl_radio_mode_info1);
     EXPECT_EQ(WifiBand::BAND_5GHZ, hidl_radio_mode_info1->bandInfo);
     ASSERT_EQ(1u, hidl_radio_mode_info1->ifaceInfos.size());
@@ -113,12 +110,11 @@
               hidl_iface_info1.channel);
 
     // Find mac info 2.
-    const auto hidl_radio_mode_info2 =
-        std::find_if(hidl_radio_mode_infos.begin(), hidl_radio_mode_infos.end(),
-                     [&legacy_mac_info2](
-                         const V1_2::IWifiChipEventCallback::RadioModeInfo& x) {
-                         return x.radioId == legacy_mac_info2.wlan_mac_id;
-                     });
+    const auto hidl_radio_mode_info2 = std::find_if(
+        hidl_radio_mode_infos.begin(), hidl_radio_mode_infos.end(),
+        [&legacy_mac_info2](const IWifiChipEventCallback::RadioModeInfo& x) {
+            return x.radioId == legacy_mac_info2.wlan_mac_id;
+        });
     ASSERT_NE(hidl_radio_mode_infos.end(), hidl_radio_mode_info2);
     EXPECT_EQ(WifiBand::BAND_24GHZ, hidl_radio_mode_info2->bandInfo);
     ASSERT_EQ(1u, hidl_radio_mode_info2->ifaceInfos.size());
diff --git a/wifi/1.4/default/wifi_ap_iface.cpp b/wifi/1.4/default/wifi_ap_iface.cpp
index e677f19..8777a4c 100644
--- a/wifi/1.4/default/wifi_ap_iface.cpp
+++ b/wifi/1.4/default/wifi_ap_iface.cpp
@@ -64,7 +64,7 @@
 }
 
 Return<void> WifiApIface::getValidFrequenciesForBand(
-    WifiBand band, getValidFrequenciesForBand_cb hidl_status_cb) {
+    V1_0::WifiBand band, getValidFrequenciesForBand_cb hidl_status_cb) {
     return validateAndCall(this, WifiStatusCode::ERROR_WIFI_IFACE_INVALID,
                            &WifiApIface::getValidFrequenciesForBandInternal,
                            hidl_status_cb, band);
@@ -100,7 +100,7 @@
 }
 
 std::pair<WifiStatus, std::vector<WifiChannelInMhz>>
-WifiApIface::getValidFrequenciesForBandInternal(WifiBand band) {
+WifiApIface::getValidFrequenciesForBandInternal(V1_0::WifiBand band) {
     static_assert(sizeof(WifiChannelInMhz) == sizeof(uint32_t),
                   "Size mismatch");
     legacy_hal::wifi_error legacy_status;
diff --git a/wifi/1.4/default/wifi_ap_iface.h b/wifi/1.4/default/wifi_ap_iface.h
index 4f3438c..bf16d5e 100644
--- a/wifi/1.4/default/wifi_ap_iface.h
+++ b/wifi/1.4/default/wifi_ap_iface.h
@@ -49,7 +49,8 @@
     Return<void> setCountryCode(const hidl_array<int8_t, 2>& code,
                                 setCountryCode_cb hidl_status_cb) override;
     Return<void> getValidFrequenciesForBand(
-        WifiBand band, getValidFrequenciesForBand_cb hidl_status_cb) override;
+        V1_0::WifiBand band,
+        getValidFrequenciesForBand_cb hidl_status_cb) override;
     Return<void> setMacAddress(const hidl_array<uint8_t, 6>& mac,
                                setMacAddress_cb hidl_status_cb) override;
     Return<void> getFactoryMacAddress(
@@ -61,7 +62,7 @@
     std::pair<WifiStatus, IfaceType> getTypeInternal();
     WifiStatus setCountryCodeInternal(const std::array<int8_t, 2>& code);
     std::pair<WifiStatus, std::vector<WifiChannelInMhz>>
-    getValidFrequenciesForBandInternal(WifiBand band);
+    getValidFrequenciesForBandInternal(V1_0::WifiBand band);
     WifiStatus setMacAddressInternal(const std::array<uint8_t, 6>& mac);
     std::pair<WifiStatus, std::array<uint8_t, 6>>
     getFactoryMacAddressInternal();
diff --git a/wifi/1.4/default/wifi_chip.cpp b/wifi/1.4/default/wifi_chip.cpp
index 40f73b5..2b015d3 100644
--- a/wifi/1.4/default/wifi_chip.cpp
+++ b/wifi/1.4/default/wifi_chip.cpp
@@ -341,7 +341,7 @@
 
 bool WifiChip::isValid() { return is_valid_; }
 
-std::set<sp<V1_2::IWifiChipEventCallback>> WifiChip::getEventCallbacks() {
+std::set<sp<IWifiChipEventCallback>> WifiChip::getEventCallbacks() {
     return event_cb_handler_.getCallbacks();
 }
 
@@ -628,6 +628,14 @@
                            hidl_status_cb, bound_iface);
 }
 
+Return<void> WifiChip::registerEventCallback_1_4(
+    const sp<IWifiChipEventCallback>& event_callback,
+    registerEventCallback_cb hidl_status_cb) {
+    return validateAndCall(this, WifiStatusCode::ERROR_WIFI_CHIP_INVALID,
+                           &WifiChip::registerEventCallbackInternal_1_4,
+                           hidl_status_cb, event_callback);
+}
+
 void WifiChip::invalidateAndRemoveAllIfaces() {
     invalidateAndClearAll(ap_ifaces_);
     invalidateAndClearAll(nan_ifaces_);
@@ -1125,11 +1133,9 @@
 }
 
 WifiStatus WifiChip::registerEventCallbackInternal_1_2(
-    const sp<V1_2::IWifiChipEventCallback>& event_callback) {
-    if (!event_cb_handler_.addCallback(event_callback)) {
-        return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
-    }
-    return createWifiStatus(WifiStatusCode::SUCCESS);
+    const sp<V1_2::IWifiChipEventCallback>& /* event_callback */) {
+    // Deprecated support for this callback.
+    return createWifiStatus(WifiStatusCode::ERROR_NOT_SUPPORTED);
 }
 
 WifiStatus WifiChip::selectTxPowerScenarioInternal_1_2(
@@ -1179,6 +1185,14 @@
     return {createWifiStatus(WifiStatusCode::SUCCESS), rtt};
 }
 
+WifiStatus WifiChip::registerEventCallbackInternal_1_4(
+    const sp<IWifiChipEventCallback>& event_callback) {
+    if (!event_cb_handler_.addCallback(event_callback)) {
+        return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
+    }
+    return createWifiStatus(WifiStatusCode::SUCCESS);
+}
+
 WifiStatus WifiChip::handleChipConfiguration(
     /* NONNULL */ std::unique_lock<std::recursive_mutex>* lock,
     ChipModeId mode_id) {
@@ -1281,7 +1295,7 @@
                 LOG(ERROR) << "Callback invoked on an invalid object";
                 return;
             }
-            std::vector<V1_2::IWifiChipEventCallback::RadioModeInfo>
+            std::vector<IWifiChipEventCallback::RadioModeInfo>
                 hidl_radio_mode_infos;
             if (!hidl_struct_util::convertLegacyWifiMacInfosToHidl(
                     mac_infos, &hidl_radio_mode_infos)) {
@@ -1289,9 +1303,9 @@
                 return;
             }
             for (const auto& callback : shared_ptr_this->getEventCallbacks()) {
-                if (!callback->onRadioModeChange(hidl_radio_mode_infos)
+                if (!callback->onRadioModeChange_1_4(hidl_radio_mode_infos)
                          .isOk()) {
-                    LOG(ERROR) << "Failed to invoke onRadioModeChange"
+                    LOG(ERROR) << "Failed to invoke onRadioModeChange_1_4"
                                << " callback on: " << toString(callback);
                 }
             }
diff --git a/wifi/1.4/default/wifi_chip.h b/wifi/1.4/default/wifi_chip.h
index 3bf1847..c76eabf 100644
--- a/wifi/1.4/default/wifi_chip.h
+++ b/wifi/1.4/default/wifi_chip.h
@@ -71,7 +71,7 @@
     // marked valid before processing them.
     void invalidate();
     bool isValid();
-    std::set<sp<V1_2::IWifiChipEventCallback>> getEventCallbacks();
+    std::set<sp<IWifiChipEventCallback>> getEventCallbacks();
 
     // HIDL methods exposed.
     Return<void> getId(getId_cb hidl_status_cb) override;
@@ -156,6 +156,9 @@
     Return<void> createRttController_1_4(
         const sp<IWifiIface>& bound_iface,
         createRttController_1_4_cb hidl_status_cb) override;
+    Return<void> registerEventCallback_1_4(
+        const sp<IWifiChipEventCallback>& event_callback,
+        registerEventCallback_1_4_cb hidl_status_cb) override;
 
    private:
     void invalidateAndRemoveAllIfaces();
@@ -223,6 +226,9 @@
     std::pair<WifiStatus, uint32_t> getCapabilitiesInternal_1_3();
     std::pair<WifiStatus, sp<IWifiRttController>>
     createRttControllerInternal_1_4(const sp<IWifiIface>& bound_iface);
+    WifiStatus registerEventCallbackInternal_1_4(
+        const sp<IWifiChipEventCallback>& event_callback);
+
     WifiStatus handleChipConfiguration(
         std::unique_lock<std::recursive_mutex>* lock, ChipModeId mode_id);
     WifiStatus registerDebugRingBufferCallback();
@@ -271,7 +277,7 @@
     // registration mechanism. Use this to check if we have already
     // registered a callback.
     bool debug_ring_buffer_cb_registered_;
-    hidl_callback_util::HidlCallbackHandler<V1_2::IWifiChipEventCallback>
+    hidl_callback_util::HidlCallbackHandler<IWifiChipEventCallback>
         event_cb_handler_;
 
     DISALLOW_COPY_AND_ASSIGN(WifiChip);
diff --git a/wifi/1.4/default/wifi_sta_iface.cpp b/wifi/1.4/default/wifi_sta_iface.cpp
index 8e1ada1..68c989d 100644
--- a/wifi/1.4/default/wifi_sta_iface.cpp
+++ b/wifi/1.4/default/wifi_sta_iface.cpp
@@ -113,7 +113,7 @@
 }
 
 Return<void> WifiStaIface::getValidFrequenciesForBand(
-    WifiBand band, getValidFrequenciesForBand_cb hidl_status_cb) {
+    V1_0::WifiBand band, getValidFrequenciesForBand_cb hidl_status_cb) {
     return validateAndCall(this, WifiStatusCode::ERROR_WIFI_IFACE_INVALID,
                            &WifiStaIface::getValidFrequenciesForBandInternal,
                            hidl_status_cb, band);
@@ -344,7 +344,7 @@
 }
 
 std::pair<WifiStatus, std::vector<WifiChannelInMhz>>
-WifiStaIface::getValidFrequenciesForBandInternal(WifiBand band) {
+WifiStaIface::getValidFrequenciesForBandInternal(V1_0::WifiBand band) {
     static_assert(sizeof(WifiChannelInMhz) == sizeof(uint32_t),
                   "Size mismatch");
     legacy_hal::wifi_error legacy_status;
diff --git a/wifi/1.4/default/wifi_sta_iface.h b/wifi/1.4/default/wifi_sta_iface.h
index ccf234f..e85e39d 100644
--- a/wifi/1.4/default/wifi_sta_iface.h
+++ b/wifi/1.4/default/wifi_sta_iface.h
@@ -63,7 +63,8 @@
     Return<void> getBackgroundScanCapabilities(
         getBackgroundScanCapabilities_cb hidl_status_cb) override;
     Return<void> getValidFrequenciesForBand(
-        WifiBand band, getValidFrequenciesForBand_cb hidl_status_cb) override;
+        V1_0::WifiBand band,
+        getValidFrequenciesForBand_cb hidl_status_cb) override;
     Return<void> startBackgroundScan(
         uint32_t cmd_id, const StaBackgroundScanParameters& params,
         startBackgroundScan_cb hidl_status_cb) override;
@@ -130,7 +131,7 @@
     std::pair<WifiStatus, StaBackgroundScanCapabilities>
     getBackgroundScanCapabilitiesInternal();
     std::pair<WifiStatus, std::vector<WifiChannelInMhz>>
-    getValidFrequenciesForBandInternal(WifiBand band);
+    getValidFrequenciesForBandInternal(V1_0::WifiBand band);
     WifiStatus startBackgroundScanInternal(
         uint32_t cmd_id, const StaBackgroundScanParameters& params);
     WifiStatus stopBackgroundScanInternal(uint32_t cmd_id);
diff --git a/wifi/1.4/types.hal b/wifi/1.4/types.hal
index 232e26f..0db0c2c 100644
--- a/wifi/1.4/types.hal
+++ b/wifi/1.4/types.hal
@@ -26,6 +26,7 @@
 import @1.0::RttType;
 import @1.0::TimeSpanInPs;
 import @1.0::TimeStampInUs;
+import @1.0::WifiBand;
 import @1.0::WifiChannelInfo;
 import @1.0::WifiChannelWidthInMhz;
 import @1.0::WifiInformationElement;
@@ -33,6 +34,28 @@
 import @1.0::WifiRatePreamble;
 
 /**
+ * Wifi bands defined in 80211 spec.
+ */
+enum WifiBand : @1.0::WifiBand {
+  /**
+   * 6 GHz.
+   */
+  BAND_6GHZ = 8,
+  /**
+   * 5 GHz no DFS + 6 GHz.
+   */
+  BAND_5GHZ_6GHZ = 10,
+  /**
+   * 2.4 GHz + 5 GHz no DFS + 6 GHz.
+   */
+  BAND_24GHZ_5GHZ_6GHZ = 11,
+  /**
+   * 2.4 GHz + 5 GHz with DFS + 6 GHz.
+   */
+  BAND_24GHZ_5GHZ_WITH_DFS_6GHZ = 15
+};
+
+/**
  * Wifi Rate Preamble
  */
 enum WifiRatePreamble : @1.0::WifiRatePreamble {
diff --git a/wifi/1.4/vts/functional/Android.bp b/wifi/1.4/vts/functional/Android.bp
index c71b319..f3be25d 100644
--- a/wifi/1.4/vts/functional/Android.bp
+++ b/wifi/1.4/vts/functional/Android.bp
@@ -21,6 +21,7 @@
     srcs: [
         "VtsHalWifiV1_4TargetTest.cpp",
         "wifi_ap_iface_hidl_test.cpp",
+        "wifi_chip_hidl_test.cpp"
     ],
     static_libs: [
         "VtsHalWifiV1_0TargetTestUtil",
diff --git a/wifi/1.4/vts/functional/wifi_chip_hidl_test.cpp b/wifi/1.4/vts/functional/wifi_chip_hidl_test.cpp
new file mode 100644
index 0000000..8ca5214
--- /dev/null
+++ b/wifi/1.4/vts/functional/wifi_chip_hidl_test.cpp
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2019 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 <VtsHalHidlTargetCallbackBase.h>
+#include <android-base/logging.h>
+
+#undef NAN  // NAN is defined in bionic/libc/include/math.h:38
+
+#include <android/hardware/wifi/1.4/IWifi.h>
+#include <android/hardware/wifi/1.4/IWifiChip.h>
+#include <android/hardware/wifi/1.4/IWifiChipEventCallback.h>
+#include <gtest/gtest.h>
+#include <hidl/GtestPrinter.h>
+#include <hidl/ServiceManagement.h>
+
+#include "wifi_hidl_call_util.h"
+#include "wifi_hidl_test_utils.h"
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::wifi::V1_0::IfaceType;
+using ::android::hardware::wifi::V1_0::WifiDebugRingBufferStatus;
+using ::android::hardware::wifi::V1_0::WifiStatus;
+using ::android::hardware::wifi::V1_0::WifiStatusCode;
+using ::android::hardware::wifi::V1_4::IWifiChip;
+using ::android::hardware::wifi::V1_4::IWifiChipEventCallback;
+
+/**
+ * Fixture to use for all Wifi chip HIDL interface tests.
+ */
+class WifiChipHidlTest : public ::testing::TestWithParam<std::string> {
+   public:
+    virtual void SetUp() override {
+        wifi_chip_ = IWifiChip::castFrom(getWifiChip(GetInstanceName()));
+        ASSERT_NE(nullptr, wifi_chip_.get());
+    }
+
+    virtual void TearDown() override { stopWifi(GetInstanceName()); }
+
+    // A simple test implementation of WifiChipEventCallback.
+    class WifiChipEventCallback
+        : public ::testing::VtsHalHidlTargetCallbackBase<WifiChipHidlTest>,
+          public IWifiChipEventCallback {
+       public:
+        WifiChipEventCallback(){};
+
+        virtual ~WifiChipEventCallback() = default;
+
+        Return<void> onChipReconfigured(uint32_t modeId __unused) {
+            return Void();
+        };
+
+        Return<void> onChipReconfigureFailure(
+            const WifiStatus& status __unused) {
+            return Void();
+        };
+
+        Return<void> onIfaceAdded(IfaceType type __unused,
+                                  const hidl_string& name __unused) {
+            return Void();
+        };
+
+        Return<void> onIfaceRemoved(IfaceType type __unused,
+                                    const hidl_string& name __unused) {
+            return Void();
+        };
+
+        Return<void> onDebugRingBufferDataAvailable(
+            const WifiDebugRingBufferStatus& status __unused,
+            const hidl_vec<uint8_t>& data __unused) {
+            return Void();
+        };
+
+        Return<void> onDebugErrorAlert(int32_t errorCode __unused,
+                                       const hidl_vec<uint8_t>& debugData
+                                           __unused) {
+            return Void();
+        };
+
+        Return<void> onRadioModeChange(
+            const hidl_vec<::android::hardware::wifi::V1_2::
+                               IWifiChipEventCallback::RadioModeInfo>&
+                radioModeInfos __unused) {
+            return Void();
+        };
+
+        Return<void> onRadioModeChange_1_4(
+            const hidl_vec<RadioModeInfo>& radioModeInfos __unused) {
+            return Void();
+        };
+    };
+
+   protected:
+    sp<IWifiChip> wifi_chip_;
+
+   private:
+    std::string GetInstanceName() { return GetParam(); }
+};
+
+/*
+ * registerEventCallback_1_4
+ * This test case tests the registerEventCallback_1_4() API which registers
+ * a call back function with the hal implementation
+ *
+ * Note: it is not feasible to test the invocation of the call back function
+ * since event is triggered internally in the HAL implementation, and can not be
+ * triggered from the test case
+ */
+TEST_P(WifiChipHidlTest, registerEventCallback_1_4) {
+    sp<WifiChipEventCallback> wifiChipEventCallback =
+        new WifiChipEventCallback();
+    const auto& status = HIDL_INVOKE(wifi_chip_, registerEventCallback_1_4,
+                                     wifiChipEventCallback);
+
+    if (status.code != WifiStatusCode::SUCCESS) {
+        EXPECT_EQ(WifiStatusCode::ERROR_NOT_SUPPORTED, status.code);
+        return;
+    }
+}