diff --git a/src/connectivity/gps/service/1.0/Gnss.cpp b/src/connectivity/gps/service/1.0/Gnss.cpp
new file mode 100644
index 0000000..c91e67a
--- /dev/null
+++ b/src/connectivity/gps/service/1.0/Gnss.cpp
@@ -0,0 +1,816 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "GnssHAL_GnssInterface"
+
+#include "Gnss.h"
+#include <GnssUtils.h>
+
+namespace android {
+namespace hardware {
+namespace gnss {
+namespace V1_0 {
+namespace implementation {
+
+#ifndef UNUSED
+#define UNUSED(x) (x)=(x)
+#endif
+
+std::vector<std::unique_ptr<ThreadFuncArgs>> Gnss::sThreadFuncArgsList;
+sp<IGnssCallback> Gnss::sGnssCbIface = nullptr;
+bool Gnss::sInterfaceExists = false;
+bool Gnss::sWakelockHeldGnss = false;
+bool Gnss::sWakelockHeldFused = false;
+
+GpsCallbacks_ext Gnss::sGnssCb = {
+    .size = sizeof(GpsCallbacks_ext),
+    .location_cb = locationCb,
+    .status_cb = statusCb,
+    .sv_status_cb = gpsSvStatusCb,
+    .nmea_cb = nmeaCb,
+    .set_capabilities_cb = setCapabilitiesCb,
+    .acquire_wakelock_cb = acquireWakelockCb,
+    .release_wakelock_cb = releaseWakelockCb,
+    .create_thread_cb = createThreadCb,
+    .request_utc_time_cb = requestUtcTimeCb,
+    .set_system_info_cb = setSystemInfoCb,
+    .gnss_sv_status_cb = gnssSvStatusCb,
+
+    .set_name_cb = setNameCb,
+    .request_location_cb = requestLocationCb
+};
+
+uint32_t Gnss::sCapabilitiesCached = 0;
+uint16_t Gnss::sYearOfHwCached = 0;
+sem_t Gnss::sSem;
+
+Gnss::Gnss(gps_device_t_ext* gnssDevice) :
+        mDeathRecipient(new GnssHidlDeathRecipient(this)) {
+    /* Error out if an instance of the interface already exists. */
+    LOG_ALWAYS_FATAL_IF(sInterfaceExists);
+    sInterfaceExists = true;
+
+    if (gnssDevice == nullptr) {
+        ALOGE("%s: Invalid device_t handle", __func__);
+        return;
+    }
+
+    mGnssIface = gnssDevice->get_gps_interface(gnssDevice);
+    sem_init(&sSem, 0, 1);
+}
+
+Gnss::~Gnss() {
+    sInterfaceExists = false;
+    sThreadFuncArgsList.clear();
+    sem_destroy(&sSem);
+}
+
+void Gnss::locationCb(GpsLocation_ext* location) {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    if (location == nullptr) {
+        ALOGE("%s: Invalid location from GNSS HAL", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    GnssLocation gnssLocation = V1_0::implementation::convertToGnssLocation(location);
+    auto ret = sGnssCbIface->gnssLocationCb(gnssLocation);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+    sem_post(&sSem);
+}
+
+void Gnss::statusCb(GpsStatus* gnssStatus) {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    if (gnssStatus == nullptr) {
+        ALOGE("%s: Invalid GpsStatus from GNSS HAL", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    IGnssCallback::GnssStatusValue status =
+            static_cast<IGnssCallback::GnssStatusValue>(gnssStatus->status);
+
+    auto ret = sGnssCbIface->gnssStatusCb(status);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+    sem_post(&sSem);
+}
+
+void Gnss::gnssSvStatusCb(GnssSvStatus_ext* status) {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    if (status == nullptr) {
+        ALOGE("Invalid status from GNSS HAL %s", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    IGnssCallback::GnssSvStatus svStatus;
+    svStatus.numSvs = status->num_svs;
+
+    if (svStatus.numSvs > static_cast<uint32_t>(V1_0::GnssMax::SVS_COUNT)) {
+        ALOGW("Too many satellites %u. Clamps to %d.", svStatus.numSvs, V1_0::GnssMax::SVS_COUNT);
+        svStatus.numSvs = static_cast<uint32_t>(V1_0::GnssMax::SVS_COUNT);
+    }
+
+    for (size_t i = 0; i < svStatus.numSvs; i++) {
+        auto svInfo = status->gnss_sv_list[i];
+        IGnssCallback::GnssSvInfo gnssSvInfo = {
+            .svid = svInfo.legacySvInfo.svid,
+            .constellation = static_cast<V1_0::GnssConstellationType>(
+                    svInfo.legacySvInfo.constellation),
+            .cN0Dbhz = svInfo.legacySvInfo.c_n0_dbhz,
+            .elevationDegrees = svInfo.legacySvInfo.elevation,
+            .azimuthDegrees = svInfo.legacySvInfo.azimuth,
+            .svFlag = static_cast<uint8_t>(svInfo.legacySvInfo.flags),
+            .carrierFrequencyHz = svInfo.carrier_frequency};
+        svStatus.gnssSvList[i] = gnssSvInfo;
+    }
+
+    auto ret = sGnssCbIface->gnssSvStatusCb(svStatus);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+    sem_post(&sSem);
+}
+
+/*
+ * This enum is used by gpsSvStatusCb() method below to convert GpsSvStatus
+ * to GnssSvStatus for backward compatibility. It is only used by the default
+ * implementation and is not part of the GNSS interface.
+ */
+enum SvidValues : uint16_t {
+    GLONASS_SVID_OFFSET = 64,
+    GLONASS_SVID_COUNT = 24,
+    BEIDOU_SVID_OFFSET = 200,
+    BEIDOU_SVID_COUNT = 35,
+    SBAS_SVID_MIN = 33,
+    SBAS_SVID_MAX = 64,
+    SBAS_SVID_ADD = 87,
+    QZSS_SVID_MIN = 193,
+    QZSS_SVID_MAX = 200
+};
+
+/*
+ * The following code that converts GpsSvStatus to GnssSvStatus is moved here from
+ * GnssLocationProvider. GnssLocationProvider does not require it anymore since GpsSvStatus is
+ * being deprecated and is no longer part of the GNSS interface.
+ */
+void Gnss::gpsSvStatusCb(GpsSvStatus* svInfo) {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    if (svInfo == nullptr) {
+        ALOGE("Invalid status from GNSS HAL %s", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    IGnssCallback::GnssSvStatus svStatus;
+    svStatus.numSvs = svInfo->num_svs;
+    /*
+     * Clamp the list size since GnssSvStatus can support a maximum of
+     * GnssMax::SVS_COUNT entries.
+     */
+    ///M: fix max numSvs as GPS_MAX_SVS
+    if (svStatus.numSvs > static_cast<uint32_t>(GPS_MAX_SVS)) {
+        ALOGW("Too many satellites %u. Clamps to %d.", svStatus.numSvs, GPS_MAX_SVS);
+        svStatus.numSvs = static_cast<uint32_t>(GPS_MAX_SVS);
+    }
+    /// M: mtk update end
+
+    uint32_t ephemerisMask = svInfo->ephemeris_mask;
+    uint32_t almanacMask = svInfo->almanac_mask;
+    uint32_t usedInFixMask = svInfo->used_in_fix_mask;
+    /*
+     * Conversion from GpsSvInfo to IGnssCallback::GnssSvInfo happens below.
+     */
+    for (size_t i = 0; i < svStatus.numSvs; i++) {
+        IGnssCallback::GnssSvInfo& info = svStatus.gnssSvList[i];
+        info.svid = svInfo->sv_list[i].prn;
+        if (info.svid >= 1 && info.svid <= 32) {
+            info.constellation = GnssConstellationType::GPS;
+        } else if (info.svid > GLONASS_SVID_OFFSET &&
+                   info.svid <= GLONASS_SVID_OFFSET + GLONASS_SVID_COUNT) {
+            info.constellation = GnssConstellationType::GLONASS;
+            info.svid -= GLONASS_SVID_OFFSET;
+        } else if (info.svid > BEIDOU_SVID_OFFSET &&
+                 info.svid <= BEIDOU_SVID_OFFSET + BEIDOU_SVID_COUNT) {
+            info.constellation = GnssConstellationType::BEIDOU;
+            info.svid -= BEIDOU_SVID_OFFSET;
+        } else if (info.svid >= SBAS_SVID_MIN && info.svid <= SBAS_SVID_MAX) {
+            info.constellation = GnssConstellationType::SBAS;
+            info.svid += SBAS_SVID_ADD;
+        } else if (info.svid >= QZSS_SVID_MIN && info.svid <= QZSS_SVID_MAX) {
+            info.constellation = GnssConstellationType::QZSS;
+        } else {
+            ALOGD("Unknown constellation type with Svid = %d.", info.svid);
+            info.constellation = GnssConstellationType::UNKNOWN;
+        }
+
+        info.cN0Dbhz = svInfo->sv_list[i].snr;
+        info.elevationDegrees = svInfo->sv_list[i].elevation;
+        info.azimuthDegrees = svInfo->sv_list[i].azimuth;
+        // TODO: b/31702236
+        info.svFlag = static_cast<uint8_t>(IGnssCallback::GnssSvFlags::NONE);
+
+        /*
+         * Only GPS info is valid for these fields, as these masks are just 32
+         * bits, by GPS prn.
+         */
+        if (info.constellation == GnssConstellationType::GPS) {
+            int32_t svidMask = (1 << (info.svid - 1));
+            if ((ephemerisMask & svidMask) != 0) {
+                info.svFlag |= IGnssCallback::GnssSvFlags::HAS_EPHEMERIS_DATA;
+            }
+            if ((almanacMask & svidMask) != 0) {
+                info.svFlag |= IGnssCallback::GnssSvFlags::HAS_ALMANAC_DATA;
+            }
+            if ((usedInFixMask & svidMask) != 0) {
+                info.svFlag |= IGnssCallback::GnssSvFlags::USED_IN_FIX;
+            }
+        }
+    }
+
+    auto ret = sGnssCbIface->gnssSvStatusCb(svStatus);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+    sem_post(&sSem);
+}
+
+void Gnss::nmeaCb(GpsUtcTime timestamp, const char* nmea, int length) {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    android::hardware::hidl_string nmeaString;
+    nmeaString.setToExternal(nmea, length);
+    auto ret = sGnssCbIface->gnssNmeaCb(timestamp, nmeaString);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+    sem_post(&sSem);
+}
+
+void Gnss::setCapabilitiesCb(uint32_t capabilities) {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    auto ret = sGnssCbIface->gnssSetCapabilitesCb(capabilities);
+    if (!ret.isOk()) {
+        ALOGE("%s: Unable to invoke callback", __func__);
+    }
+
+    // Save for reconnection when some legacy hal's don't resend this info
+    sCapabilitiesCached = capabilities;
+    sem_post(&sSem);
+}
+
+void Gnss::acquireWakelockCb() {
+    acquireWakelockGnss();
+}
+
+void Gnss::releaseWakelockCb() {
+    releaseWakelockGnss();
+}
+
+
+void Gnss::acquireWakelockGnss() {
+    sWakelockHeldGnss = true;
+    updateWakelock();
+}
+
+void Gnss::releaseWakelockGnss() {
+    sWakelockHeldGnss = false;
+    updateWakelock();
+}
+
+void Gnss::acquireWakelockFused() {
+    sWakelockHeldFused = true;
+    updateWakelock();
+}
+
+void Gnss::releaseWakelockFused() {
+    sWakelockHeldFused = false;
+    updateWakelock();
+}
+
+void Gnss::updateWakelock() {
+    // Track the state of the last request - in case the wake lock in the layer above is reference
+    // counted.
+    static bool sWakelockHeld = false;
+
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    if (sWakelockHeldGnss || sWakelockHeldFused) {
+        if (!sWakelockHeld) {
+            ALOGI("%s: GNSS HAL Wakelock acquired due to gps: %d, fused: %d", __func__,
+                    sWakelockHeldGnss, sWakelockHeldFused);
+            sWakelockHeld = true;
+            auto ret = sGnssCbIface->gnssAcquireWakelockCb();
+            if (!ret.isOk()) {
+                ALOGE("%s: Unable to invoke callback", __func__);
+            }
+        }
+    } else {
+        if (sWakelockHeld) {
+            ALOGI("%s: GNSS HAL Wakelock released", __func__);
+        } else  {
+            // To avoid burning power, always release, even if logic got here with sWakelock false
+            // which it shouldn't, unless underlying *.h implementation makes duplicate requests.
+            ALOGW("%s: GNSS HAL Wakelock released, duplicate request", __func__);
+        }
+        sWakelockHeld = false;
+        auto ret = sGnssCbIface->gnssReleaseWakelockCb();
+        if (!ret.isOk()) {
+            ALOGE("%s: Unable to invoke callback", __func__);
+        }
+    }
+    sem_post(&sSem);
+}
+
+void Gnss::requestUtcTimeCb() {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    auto ret = sGnssCbIface->gnssRequestTimeCb();
+    if (!ret.isOk()) {
+            ALOGE("%s: Unable to invoke callback", __func__);
+    }
+    sem_post(&sSem);
+}
+
+pthread_t Gnss::createThreadCb(const char* name, void (*start)(void*), void* arg) {
+    return createPthread(name, start, arg, &sThreadFuncArgsList);
+}
+
+void Gnss::setSystemInfoCb(const LegacyGnssSystemInfo* info) {
+    sem_wait(&sSem);
+    if (sGnssCbIface == nullptr) {
+        ALOGE("%s: GNSS Callback Interface configured incorrectly", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    if (info == nullptr) {
+        ALOGE("Invalid GnssSystemInfo from GNSS HAL %s", __func__);
+        sem_post(&sSem);
+        return;
+    }
+
+    IGnssCallback::GnssSystemInfo gnssInfo = {
+        .yearOfHw = info->year_of_hw
+    };
+
+    auto ret = sGnssCbIface->gnssSetSystemInfoCb(gnssInfo);
+    if (!ret.isOk()) {
+            ALOGE("%s: Unable to invoke callback", __func__);
+    }
+
+    // Save for reconnection when some legacy hal's don't resend this info
+    sYearOfHwCached = info->year_of_hw;
+    sem_post(&sSem);
+}
+
+void Gnss::setNameCb(const char* name, int length) {
+    UNUSED(name);
+    UNUSED(length);
+}
+
+void Gnss::requestLocationCb(bool independentFromGnss) {
+    UNUSED(independentFromGnss);
+}
+
+
+
+// Methods from ::android::hardware::gnss::V1_0::IGnss follow.
+Return<bool> Gnss::setCallback(const sp<IGnssCallback>& callback)  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return false;
+    }
+
+    if (callback == nullptr)  {
+        ALOGE("%s: Null callback ignored", __func__);
+        return false;
+    }
+
+    sem_wait(&sSem);
+    if (sGnssCbIface != NULL) {
+        ALOGW("%s called more than once. Unexpected unless test.", __func__);
+        sGnssCbIface->unlinkToDeath(mDeathRecipient);
+    }
+
+    sGnssCbIface = callback;
+    callback->linkToDeath(mDeathRecipient, 0 /*cookie*/);
+    sem_post(&sSem);
+
+    // If this was received in the past, send it up again to refresh caller.
+    // mGnssIface will override after init() is called below, if needed
+    // (though it's unlikely the gps.h capabilities or system info will change.)
+    if (sCapabilitiesCached != 0) {
+        setCapabilitiesCb(sCapabilitiesCached);
+    }
+    if (sYearOfHwCached != 0) {
+        LegacyGnssSystemInfo info;
+        info.year_of_hw = sYearOfHwCached;
+        setSystemInfoCb(&info);
+    }
+
+    return (mGnssIface->init(&sGnssCb) == 0);
+}
+
+Return<bool> Gnss::start()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return false;
+    }
+
+    return (mGnssIface->start() == 0);
+}
+
+Return<bool> Gnss::stop()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return false;
+    }
+
+    return (mGnssIface->stop() == 0);
+}
+
+Return<void> Gnss::cleanup()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+    } else {
+        mGnssIface->cleanup();
+    }
+    return Void();
+}
+
+Return<bool> Gnss::injectLocation(double latitudeDegrees,
+                                  double longitudeDegrees,
+                                  float accuracyMeters)  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return false;
+    }
+
+    return (mGnssIface->inject_location(latitudeDegrees, longitudeDegrees, accuracyMeters) == 0);
+}
+
+Return<bool> Gnss::injectTime(int64_t timeMs, int64_t timeReferenceMs,
+                              int32_t uncertaintyMs) {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return false;
+    }
+
+    return (mGnssIface->inject_time(timeMs, timeReferenceMs, uncertaintyMs) == 0);
+}
+
+Return<void> Gnss::deleteAidingData(IGnss::GnssAidingData aidingDataFlags)  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+    } else {
+        mGnssIface->delete_aiding_data(static_cast<GpsAidingData>(aidingDataFlags));
+    }
+    return Void();
+}
+
+Return<bool> Gnss::setPositionMode(IGnss::GnssPositionMode mode,
+                                   IGnss::GnssPositionRecurrence recurrence,
+                                   uint32_t minIntervalMs,
+                                   uint32_t preferredAccuracyMeters,
+                                   uint32_t preferredTimeMs)  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return false;
+    }
+
+    return (mGnssIface->set_position_mode(static_cast<GpsPositionMode>(mode),
+                                          static_cast<GpsPositionRecurrence>(recurrence),
+                                          minIntervalMs,
+                                          preferredAccuracyMeters,
+                                          preferredTimeMs,
+                                          false /* lowPowerMode*/) == 0);
+}
+
+Return<sp<IAGnssRil>> Gnss::getExtensionAGnssRil() {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mGnssRil == nullptr) {
+        const AGpsRilInterface* agpsRilIface = static_cast<const AGpsRilInterface*>(
+                mGnssIface->get_extension(AGPS_RIL_INTERFACE));
+        if (agpsRilIface == nullptr) {
+            ALOGI("%s: GnssRil interface not implemented by HAL", __func__);
+        } else {
+            mGnssRil = new AGnssRil(agpsRilIface);
+        }
+    }
+    return mGnssRil;
+}
+
+Return<sp<IGnssConfiguration>> Gnss::getExtensionGnssConfiguration()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    /*if (mGnssConfig == nullptr) {
+        const GnssConfigurationInterface* gnssConfigIface =
+                static_cast<const GnssConfigurationInterface*>(
+                        mGnssIface->get_extension(GNSS_CONFIGURATION_INTERFACE));
+
+        if (gnssConfigIface == nullptr) {*/
+            ALOGW("%s: GnssConfiguration interface not implemented by HAL", __func__);
+        /*} else {
+            mGnssConfig = new GnssConfiguration(gnssConfigIface);
+        }
+    }*/
+    return mGnssConfig;
+}
+
+Return<sp<IGnssGeofencing>> Gnss::getExtensionGnssGeofencing()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    /*if (mGnssGeofencingIface == nullptr) {
+        const GpsGeofencingInterface* gpsGeofencingIface =
+                static_cast<const GpsGeofencingInterface*>(
+                        mGnssIface->get_extension(GPS_GEOFENCING_INTERFACE));
+
+        if (gpsGeofencingIface == nullptr) {*/
+            ALOGE("%s: GnssGeofencing interface not implemented by HAL", __func__);
+/*        } else {
+            mGnssGeofencingIface = new GnssGeofencing(gpsGeofencingIface);
+        }
+    }
+*/
+    return mGnssGeofencingIface;
+}
+
+Return<sp<IAGnss>> Gnss::getExtensionAGnss()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mAGnssIface == nullptr) {
+        const AGpsInterface* agpsIface = static_cast<const AGpsInterface*>(
+                mGnssIface->get_extension(AGPS_INTERFACE));
+        if (agpsIface == nullptr) {
+            ALOGE("%s: AGnss interface not implemented by HAL", __func__);
+        } else {
+            mAGnssIface = new V1_0::implementation::AGnss(agpsIface);
+        }
+    }
+    return mAGnssIface;
+}
+
+Return<sp<V1_0::IGnssNi>> Gnss::getExtensionGnssNi()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mGnssNi == nullptr) {
+        const GpsNiInterface* gpsNiIface = static_cast<const GpsNiInterface*>(
+                mGnssIface->get_extension(GPS_NI_INTERFACE));
+        if (gpsNiIface == nullptr) {
+            ALOGI("%s: GnssNi interface not implemented by HAL", __func__);
+        } else {
+            mGnssNi = new GnssNi(gpsNiIface);
+        }
+    }
+    return mGnssNi;
+}
+
+Return<sp<IGnssMeasurement>> Gnss::getExtensionGnssMeasurement() {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mGnssMeasurement == nullptr) {
+        const GpsMeasurementInterface_ext* gpsMeasurementIface =
+                static_cast<const GpsMeasurementInterface_ext*>(
+                        mGnssIface->get_extension(GPS_MEASUREMENT_INTERFACE));
+
+        if (gpsMeasurementIface == nullptr) {
+            ALOGE("%s: GnssMeasurement interface not implemented by HAL", __func__);
+        } else {
+            mGnssMeasurement = new GnssMeasurement(gpsMeasurementIface);
+        }
+    }
+    return mGnssMeasurement;
+}
+
+Return<sp<V1_0::IGnssNavigationMessage>> Gnss::getExtensionGnssNavigationMessage() {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mGnssNavigationMessage == nullptr) {
+        const GpsNavigationMessageInterface* gpsNavigationMessageIface =
+                static_cast<const GpsNavigationMessageInterface*>(
+                        mGnssIface->get_extension(GPS_NAVIGATION_MESSAGE_INTERFACE));
+
+        if (gpsNavigationMessageIface == nullptr) {
+            ALOGI("%s: GnssNavigationMessage interface not implemented by HAL", __func__);
+        } else {
+            mGnssNavigationMessage = new GnssNavigationMessage(gpsNavigationMessageIface);
+        }
+    }
+
+    return mGnssNavigationMessage;
+}
+
+Return<sp<IGnssXtra>> Gnss::getExtensionXtra()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mGnssXtraIface == nullptr) {
+        const GpsXtraInterface* gpsXtraIface = static_cast<const GpsXtraInterface*>(
+                mGnssIface->get_extension(GPS_XTRA_INTERFACE));
+
+        if (gpsXtraIface == nullptr) {
+            ALOGI("%s: GnssXtra interface not implemented by HAL", __func__);
+        } else {
+            mGnssXtraIface = new GnssXtra(gpsXtraIface);
+        }
+    }
+
+    return mGnssXtraIface;
+}
+
+Return<sp<IGnssDebug>> Gnss::getExtensionGnssDebug()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mGnssDebug == nullptr) {
+        const GpsDebugInterface* gpsDebugIface = static_cast<const GpsDebugInterface*>(
+                mGnssIface->get_extension(GPS_DEBUG_INTERFACE));
+
+        if (gpsDebugIface == nullptr) {
+            ALOGI("%s: GnssDebug interface not implemented by HAL", __func__);
+        } else {
+            mGnssDebug = new GnssDebug(gpsDebugIface);
+        }
+    }
+
+    return mGnssDebug;
+}
+
+Return<sp<IGnssBatching>> Gnss::getExtensionGnssBatching()  {
+    if (mGnssIface == nullptr) {
+        ALOGE("%s: Gnss interface is unavailable", __func__);
+        return nullptr;
+    }
+
+    if (mGnssBatching == nullptr) {
+        hw_module_t* module;
+        const FlpLocationInterface* flpLocationIface = nullptr;
+        int err = hw_get_module(FUSED_LOCATION_HARDWARE_MODULE_ID, (hw_module_t const**)&module);
+
+        if (err != 0) {
+            ALOGE("gnss flp hw_get_module failed: %d", err);
+        } else if (module == nullptr) {
+            ALOGE("Fused Location hw_get_module returned null module");
+        } else if (module->methods == nullptr) {
+            ALOGE("Fused Location hw_get_module returned null methods");
+        } else {
+            hw_device_t* device;
+            err = module->methods->open(module, FUSED_LOCATION_HARDWARE_MODULE_ID, &device);
+            if (err != 0) {
+                ALOGE("flpDevice open failed: %d", err);
+            } else {
+                flp_device_t * flpDevice = reinterpret_cast<flp_device_t*>(device);
+                flpLocationIface = flpDevice->get_flp_interface(flpDevice);
+            }
+        }
+
+        if (flpLocationIface == nullptr) {
+            ALOGE("%s: GnssBatching interface is not implemented by HAL", __func__);
+        } else {
+            mGnssBatching = new GnssBatching(flpLocationIface);
+        }
+    }
+    return mGnssBatching;
+}
+
+void Gnss::handleHidlDeath() {
+    ALOGW("GNSS service noticed HIDL death. Stopping all GNSS operations.");
+
+    /// M: move here! Do not callback to system_server to avoid gnss hidl service NE
+    /*
+     * This has died, so close it off in case (race condition) callbacks happen
+     * before HAL processes above messages.
+     */
+    sem_wait(&sSem);
+    sGnssCbIface = nullptr;
+    sem_post(&sSem);
+
+    // commands down to the HAL implementation
+    stop(); // stop ongoing GPS tracking
+    if (mGnssMeasurement != nullptr) {
+        mGnssMeasurement->close();
+    }
+    if (mGnssNavigationMessage != nullptr) {
+        mGnssNavigationMessage->close();
+    }
+    if (mGnssBatching != nullptr) {
+        mGnssBatching->stop();
+        mGnssBatching->cleanup();
+    }
+    cleanup();
+
+}
+
+IGnss* HIDL_FETCH_IGnss(const char* /* hal */) {
+    hw_module_t* module;
+    IGnss* iface = nullptr;
+    int err = hw_get_module(GPS_HARDWARE_MODULE_ID, (hw_module_t const**)&module);
+
+    if (err == 0) {
+        hw_device_t* device;
+        err = module->methods->open(module, GPS_HARDWARE_MODULE_ID, &device);
+        if (err == 0) {
+            iface = new Gnss(reinterpret_cast<gps_device_t_ext*>(device));
+        } else {
+            ALOGE("gnssDevice open %s failed: %d", GPS_HARDWARE_MODULE_ID, err);
+        }
+    } else {
+      ALOGE("gnss hw_get_module %s failed: %d", GPS_HARDWARE_MODULE_ID, err);
+    }
+    return iface;
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace gnss
+}  // namespace hardware
+}  // namespace android