diff --git a/Android.bp b/Android.bp
index 7bf2d44..006061e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -6,6 +6,7 @@
     "benchmarks/msgq/1.0",
     "bluetooth/1.0",
     "biometrics/fingerprint/2.1",
+    "gnss/1.0",
     "graphics/allocator/2.0",
     "graphics/allocator/2.0/default",
     "graphics/composer/2.1",
diff --git a/gnss/1.0/Android.bp b/gnss/1.0/Android.bp
new file mode 100644
index 0000000..730087f
--- /dev/null
+++ b/gnss/1.0/Android.bp
@@ -0,0 +1,166 @@
+// This file is autogenerated by hidl-gen. Do not edit manually.
+
+genrule {
+    name: "android.hardware.gnss@1.0_genc++",
+    tool: "hidl-gen",
+    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.gnss@1.0",
+    srcs: [
+        "types.hal",
+        "IAGnss.hal",
+        "IAGnssCallback.hal",
+        "IAGnssRil.hal",
+        "IAGnssRilCallback.hal",
+        "IGnss.hal",
+        "IGnssCallback.hal",
+        "IGnssGeofenceCallback.hal",
+        "IGnssGeofencing.hal",
+        "IGnssMeasurement.hal",
+        "IGnssMeasurementCallback.hal",
+        "IGnssNavigationMessage.hal",
+        "IGnssNavigationMessageCallback.hal",
+        "IGnssNi.hal",
+        "IGnssNiCallback.hal",
+        "IGnssXtra.hal",
+        "IGnssXtraCallback.hal",
+    ],
+    out: [
+        "android/hardware/gnss/1.0/types.cpp",
+        "android/hardware/gnss/1.0/AGnssAll.cpp",
+        "android/hardware/gnss/1.0/AGnssCallbackAll.cpp",
+        "android/hardware/gnss/1.0/AGnssRilAll.cpp",
+        "android/hardware/gnss/1.0/AGnssRilCallbackAll.cpp",
+        "android/hardware/gnss/1.0/GnssAll.cpp",
+        "android/hardware/gnss/1.0/GnssCallbackAll.cpp",
+        "android/hardware/gnss/1.0/GnssGeofenceCallbackAll.cpp",
+        "android/hardware/gnss/1.0/GnssGeofencingAll.cpp",
+        "android/hardware/gnss/1.0/GnssMeasurementAll.cpp",
+        "android/hardware/gnss/1.0/GnssMeasurementCallbackAll.cpp",
+        "android/hardware/gnss/1.0/GnssNavigationMessageAll.cpp",
+        "android/hardware/gnss/1.0/GnssNavigationMessageCallbackAll.cpp",
+        "android/hardware/gnss/1.0/GnssNiAll.cpp",
+        "android/hardware/gnss/1.0/GnssNiCallbackAll.cpp",
+        "android/hardware/gnss/1.0/GnssXtraAll.cpp",
+        "android/hardware/gnss/1.0/GnssXtraCallbackAll.cpp",
+    ],
+}
+
+genrule {
+    name: "android.hardware.gnss@1.0_genc++_headers",
+    tool: "hidl-gen",
+    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.gnss@1.0",
+    srcs: [
+        "types.hal",
+        "IAGnss.hal",
+        "IAGnssCallback.hal",
+        "IAGnssRil.hal",
+        "IAGnssRilCallback.hal",
+        "IGnss.hal",
+        "IGnssCallback.hal",
+        "IGnssGeofenceCallback.hal",
+        "IGnssGeofencing.hal",
+        "IGnssMeasurement.hal",
+        "IGnssMeasurementCallback.hal",
+        "IGnssNavigationMessage.hal",
+        "IGnssNavigationMessageCallback.hal",
+        "IGnssNi.hal",
+        "IGnssNiCallback.hal",
+        "IGnssXtra.hal",
+        "IGnssXtraCallback.hal",
+    ],
+    out: [
+        "android/hardware/gnss/1.0/types.h",
+        "android/hardware/gnss/1.0/IAGnss.h",
+        "android/hardware/gnss/1.0/IHwAGnss.h",
+        "android/hardware/gnss/1.0/BnAGnss.h",
+        "android/hardware/gnss/1.0/BpAGnss.h",
+        "android/hardware/gnss/1.0/BsAGnss.h",
+        "android/hardware/gnss/1.0/IAGnssCallback.h",
+        "android/hardware/gnss/1.0/IHwAGnssCallback.h",
+        "android/hardware/gnss/1.0/BnAGnssCallback.h",
+        "android/hardware/gnss/1.0/BpAGnssCallback.h",
+        "android/hardware/gnss/1.0/BsAGnssCallback.h",
+        "android/hardware/gnss/1.0/IAGnssRil.h",
+        "android/hardware/gnss/1.0/IHwAGnssRil.h",
+        "android/hardware/gnss/1.0/BnAGnssRil.h",
+        "android/hardware/gnss/1.0/BpAGnssRil.h",
+        "android/hardware/gnss/1.0/BsAGnssRil.h",
+        "android/hardware/gnss/1.0/IAGnssRilCallback.h",
+        "android/hardware/gnss/1.0/IHwAGnssRilCallback.h",
+        "android/hardware/gnss/1.0/BnAGnssRilCallback.h",
+        "android/hardware/gnss/1.0/BpAGnssRilCallback.h",
+        "android/hardware/gnss/1.0/BsAGnssRilCallback.h",
+        "android/hardware/gnss/1.0/IGnss.h",
+        "android/hardware/gnss/1.0/IHwGnss.h",
+        "android/hardware/gnss/1.0/BnGnss.h",
+        "android/hardware/gnss/1.0/BpGnss.h",
+        "android/hardware/gnss/1.0/BsGnss.h",
+        "android/hardware/gnss/1.0/IGnssCallback.h",
+        "android/hardware/gnss/1.0/IHwGnssCallback.h",
+        "android/hardware/gnss/1.0/BnGnssCallback.h",
+        "android/hardware/gnss/1.0/BpGnssCallback.h",
+        "android/hardware/gnss/1.0/BsGnssCallback.h",
+        "android/hardware/gnss/1.0/IGnssGeofenceCallback.h",
+        "android/hardware/gnss/1.0/IHwGnssGeofenceCallback.h",
+        "android/hardware/gnss/1.0/BnGnssGeofenceCallback.h",
+        "android/hardware/gnss/1.0/BpGnssGeofenceCallback.h",
+        "android/hardware/gnss/1.0/BsGnssGeofenceCallback.h",
+        "android/hardware/gnss/1.0/IGnssGeofencing.h",
+        "android/hardware/gnss/1.0/IHwGnssGeofencing.h",
+        "android/hardware/gnss/1.0/BnGnssGeofencing.h",
+        "android/hardware/gnss/1.0/BpGnssGeofencing.h",
+        "android/hardware/gnss/1.0/BsGnssGeofencing.h",
+        "android/hardware/gnss/1.0/IGnssMeasurement.h",
+        "android/hardware/gnss/1.0/IHwGnssMeasurement.h",
+        "android/hardware/gnss/1.0/BnGnssMeasurement.h",
+        "android/hardware/gnss/1.0/BpGnssMeasurement.h",
+        "android/hardware/gnss/1.0/BsGnssMeasurement.h",
+        "android/hardware/gnss/1.0/IGnssMeasurementCallback.h",
+        "android/hardware/gnss/1.0/IHwGnssMeasurementCallback.h",
+        "android/hardware/gnss/1.0/BnGnssMeasurementCallback.h",
+        "android/hardware/gnss/1.0/BpGnssMeasurementCallback.h",
+        "android/hardware/gnss/1.0/BsGnssMeasurementCallback.h",
+        "android/hardware/gnss/1.0/IGnssNavigationMessage.h",
+        "android/hardware/gnss/1.0/IHwGnssNavigationMessage.h",
+        "android/hardware/gnss/1.0/BnGnssNavigationMessage.h",
+        "android/hardware/gnss/1.0/BpGnssNavigationMessage.h",
+        "android/hardware/gnss/1.0/BsGnssNavigationMessage.h",
+        "android/hardware/gnss/1.0/IGnssNavigationMessageCallback.h",
+        "android/hardware/gnss/1.0/IHwGnssNavigationMessageCallback.h",
+        "android/hardware/gnss/1.0/BnGnssNavigationMessageCallback.h",
+        "android/hardware/gnss/1.0/BpGnssNavigationMessageCallback.h",
+        "android/hardware/gnss/1.0/BsGnssNavigationMessageCallback.h",
+        "android/hardware/gnss/1.0/IGnssNi.h",
+        "android/hardware/gnss/1.0/IHwGnssNi.h",
+        "android/hardware/gnss/1.0/BnGnssNi.h",
+        "android/hardware/gnss/1.0/BpGnssNi.h",
+        "android/hardware/gnss/1.0/BsGnssNi.h",
+        "android/hardware/gnss/1.0/IGnssNiCallback.h",
+        "android/hardware/gnss/1.0/IHwGnssNiCallback.h",
+        "android/hardware/gnss/1.0/BnGnssNiCallback.h",
+        "android/hardware/gnss/1.0/BpGnssNiCallback.h",
+        "android/hardware/gnss/1.0/BsGnssNiCallback.h",
+        "android/hardware/gnss/1.0/IGnssXtra.h",
+        "android/hardware/gnss/1.0/IHwGnssXtra.h",
+        "android/hardware/gnss/1.0/BnGnssXtra.h",
+        "android/hardware/gnss/1.0/BpGnssXtra.h",
+        "android/hardware/gnss/1.0/BsGnssXtra.h",
+        "android/hardware/gnss/1.0/IGnssXtraCallback.h",
+        "android/hardware/gnss/1.0/IHwGnssXtraCallback.h",
+        "android/hardware/gnss/1.0/BnGnssXtraCallback.h",
+        "android/hardware/gnss/1.0/BpGnssXtraCallback.h",
+        "android/hardware/gnss/1.0/BsGnssXtraCallback.h",
+    ],
+}
+
+cc_library_shared {
+    name: "android.hardware.gnss@1.0",
+    generated_sources: ["android.hardware.gnss@1.0_genc++"],
+    generated_headers: ["android.hardware.gnss@1.0_genc++_headers"],
+    export_generated_headers: ["android.hardware.gnss@1.0_genc++_headers"],
+    shared_libs: [
+        "libhidl",
+        "libhwbinder",
+        "libutils",
+        "libcutils",
+    ],
+}
diff --git a/gnss/1.0/IAGnss.hal b/gnss/1.0/IAGnss.hal
new file mode 100644
index 0000000..a3172f3
--- /dev/null
+++ b/gnss/1.0/IAGnss.hal
@@ -0,0 +1,77 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+import IAGnssCallback;
+
+/*
+ * Extended interface for AGNSS support.
+ */
+interface IAGnss {
+    enum ApnIpType : uint16_t {
+        INVALID  = 0,
+        IPV4     = 1,
+        IPV6     = 2,
+        IPV4V6   = 3
+    };
+
+    /*
+     * Opens the AGNSS interface and provides the callback routines to the
+     * implementation of this interface.
+     *
+     * @param callback Handle to the AGNSS status callback interface.
+     */
+    setCallback(IAGnssCallback callback);
+
+    /*
+     * Notifies that the AGNSS data connection has been closed.
+     *
+     * @return success True if the operation is successful.
+     */
+    dataConnClosed() generates (bool success);
+
+    /*
+     * Notifies that a data connection is not available for AGNSS.
+     *
+     * @return success True if the operation is successful.
+     */
+    dataConnFailed() generates (bool success);
+
+    /*
+     * Sets the hostname and port for the AGNSS server.
+     *
+     * @param type Specifies if SUPL or C2K.
+     * @param hostname Hostname of the AGNSS server.
+     * @param port Port number associated with the server.
+     *
+     * @return success True if the operation is successful.
+     */
+    setServer(AGnssType type, string hostname, int32_t port)
+        generates (bool success);
+
+    /*
+     * Notifies that a data connection is available and sets the name of the
+     * APN, and its IP type, to be used for SUPL connections.
+     *
+     * @param apn Access Point Name(follows regular APN naming convention).
+     * @param apnIpType Specifies if SUPL or C2K.
+     *
+     * @return success True if the operation is successful.
+     */
+    dataConnOpenWithApnIpType(string apn, ApnIpType apnIpType)
+        generates (bool success);
+};
diff --git a/gnss/1.0/IAGnssCallback.hal b/gnss/1.0/IAGnssCallback.hal
new file mode 100644
index 0000000..46641be
--- /dev/null
+++ b/gnss/1.0/IAGnssCallback.hal
@@ -0,0 +1,78 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+/** Callback structure for the AGNSS interface. */
+interface IAGnssCallback {
+    /** AGNSS type **/
+    enum AGnssType : uint16_t {
+        TYPE_SUPL         = 1,
+        TYPE_C2K          = 2
+    };
+
+    enum AGnssStatusValue : uint16_t {
+        /** GNSS requests data connection for AGNSS. */
+        REQUEST_AGNSS_DATA_CONN  = 1,
+        /** GNSS releases the AGNSS data connection. */
+        RELEASE_AGNSS_DATA_CONN  = 2,
+        /** AGNSS data connection initiated */
+        AGNSS_DATA_CONNECTED     = 3,
+        /** AGNSS data connection completed */
+        AGNSS_DATA_CONN_DONE     = 4,
+        /** AGNSS data connection failed */
+        AGNSS_DATA_CONN_FAILED   = 5
+    };
+
+    /*
+     * Represents the status of AGNSS augmented to support IPv4.
+     */
+    struct AGnssStatusIpV4 {
+        AGnssType type;
+        AGnssStatusValue status;
+        /*
+         * 32-bit IPv4 address.
+         */
+        uint32_t ipV4Addr;
+    };
+
+    /*
+     * Represents the status of AGNSS augmented to support IPv6.
+     */
+    struct AGnssStatusIpV6 {
+        AGnssType type;
+        AGnssStatusValue status;
+        /*
+         * 128-bit IPv6 address.
+         */
+        uint8_t[16] ipV6Addr;
+    };
+
+    /*
+     * Callback with AGNSS(IpV4) status information.
+     *
+     * @param status Will be of type AGnssStatusIpV4.
+     */
+    agnssStatusIpV4Cb(AGnssStatusIpV4 status);
+
+    /*
+     * Callback with AGNSS(IpV6) status information.
+     *
+     * @param status Will be of type AGnssStatusIpV6.
+     */
+    agnssStatusIpV6Cb(AGnssStatusIpV6 status);
+
+};
diff --git a/gnss/1.0/IAGnssRil.hal b/gnss/1.0/IAGnssRil.hal
new file mode 100644
index 0000000..fb73498
--- /dev/null
+++ b/gnss/1.0/IAGnssRil.hal
@@ -0,0 +1,151 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+import IAGnssRilCallback;
+
+/*
+ * Extended interface for AGNSS RIL support. An Assisted GNSS Radio Interface
+ * Layer interface allows the GNSS chipset to request radio interface layer
+ * information from Android platform. Examples of such information are reference
+ * location, unique subscriber ID, phone number string and network availability changes.
+ */
+interface IAGnssRil {
+    enum SetIDType : uint16_t {
+        NONE    = 0,
+        IMSI    = 1,
+        MSISDM  = 2
+    };
+
+    enum NetworkType : int32_t {
+        MOBILE  = 0,
+        WIFI    = 1,
+        MMS     = 2,
+        SUPL    = 3,
+        DUN     = 4,
+        HIPRI   = 5,
+        WIMAX   = 6,
+    };
+
+    enum AGnssRefLocationType {
+        GSM_CELLID   = 1,
+        UMTS_CELLID  = 2,
+        MAC          = 3,
+        LTE_CELLID   = 4,
+    };
+
+    /* CellID for 2G, 3G and LTE, used in AGNSS. */
+    struct AGnssRefLocationCellID {
+        AGnssRefLocationType type;
+
+        /* Mobile Country Code. */
+        uint16_t mcc;
+
+        /* Mobile Network Code .*/
+        uint16_t mnc;
+
+        /*
+         * Location Area Code in 2G, 3G and LTE. In 3G lac is discarded. In LTE,
+         * lac is populated with tac, to ensure that we don't break old clients that
+         * might rely in the old (wrong) behavior.
+         */
+        uint16_t lac;
+
+        /* Cell id in 2G. Utran Cell id in 3G. Cell Global Id EUTRA in LTE. */
+        uint32_t cid;
+
+        /* Tracking Area Code in LTE. */
+        uint16_t tac;
+
+        /* Physical Cell id in LTE (not used in 2G and 3G) */
+        uint16_t pcid;
+    };
+
+    struct AGnssRefLocationMac {
+        uint8_t[6] mac;
+    };
+
+    /* Represents ref locations */
+    struct AGnssRefLocation {
+        AGnssRefLocationType type;
+
+        union RefLoc {
+            AGnssRefLocationCellID cellID;
+            AGnssRefLocationMac mac;
+        };
+
+        RefLoc refLocVal;
+    };
+
+    /*
+     * Opens the AGNSS interface and provides the callback routines
+     * to the implementation of this interface.
+     *
+     * @param callback Interface for AGnssRil callbacks.
+     */
+    setCallback(IAGnssRilCallback callback);
+
+    /*
+     * Sets the reference location.
+     *
+     * @param agnssReflocation AGNSS reference location CellID/MAC.
+     */
+    setRefLocation(AGnssRefLocation agnssReflocation);
+
+    /*
+     * Sets the SET ID.
+     *
+     * @param type Must be populated with either IMSI or MSISDN or NONE.
+     * @param setid If type is IMSI then setid is populated with
+     * a string representing the unique Subscriber ID, for example, the IMSI for
+     * a GMS phone. If type is MSISDN, then setid must contain
+     * the phone number string for line 1. For example, the MSISDN for a GSM phone.
+     * If the type is NONE, then the string must be empty.
+     *
+     * @return success True if all parameters were valid and operation was
+     * successful.
+     */
+    setSetId(SetIDType type, string setid) generates (bool success);
+
+    /*
+     * Notify GNSS of network status changes.
+     *
+     * @param connected Indicates whether network connectivity exists and
+     * it is possible to establish connections and pass data.
+     * @param type Indicates the kind of network, for eg. mobile, wifi etc.
+     * @param roaming Indicates whether the device is currently roaming on
+     * this network.
+     *
+     * @return success True is all parameters were valid and operation was
+     * successful.
+     */
+    updateNetworkState(bool connected, NetworkType type, bool roaming)
+        generates (bool success);
+
+    /*
+     * Notify GNSS of network status changes.
+     *
+     * @param available Indicates whether network connectivity is available.
+     * @param apn String containing the Access Point Name.
+     *
+     * @return success True if all parameters were valid and the operation was
+     * successful.
+     * TODO(b/32022567): Add VTS test to validate the format of APN.
+     */
+    updateNetworkAvailability(bool available, string apn) generates (bool success);
+
+};
diff --git a/gnss/1.0/IAGnssRilCallback.hal b/gnss/1.0/IAGnssRilCallback.hal
new file mode 100644
index 0000000..6f29820
--- /dev/null
+++ b/gnss/1.0/IAGnssRilCallback.hal
@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+/*
+ * Callback for IAGnssRil interface. Used to request SET ID and
+ * Reference Location.
+ */
+interface IAGnssRilCallback {
+    /* Kinds of SET ID that can be requested */
+    enum ID : uint32_t {
+        IMSI    = 1 << 0L,
+        MSISDN  = 1 << 1L,
+    };
+
+    /* Kinds of reference location that can be requested. */
+    enum RefLoc : uint32_t {
+        CELLID = 1 << 0L,
+        MAC    = 1 << 1L
+    };
+
+    /*
+     * The Hal uses this API to request a SET ID.
+     *
+     * @param setIdflag Specifies the kind of SET ID that is required by the HAL.
+     */
+    requestSetIdCb(ID setIdflag);
+
+    /*
+     * The Hal uses this API to request a reference location.
+     *
+     * @param refLocflag Specifies the kind of reference location that is required
+     * by the HAL.
+     */
+    requestRefLocCb(RefLoc refLocflag);
+
+};
diff --git a/gnss/1.0/IGnss.hal b/gnss/1.0/IGnss.hal
new file mode 100644
index 0000000..0f16124
--- /dev/null
+++ b/gnss/1.0/IGnss.hal
@@ -0,0 +1,203 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+import IAGnss;
+import IAGnssRil;
+import IGnssMeasurement;
+import IGnssNavigationMessage;
+import IGnssCallback;
+import IGnssGeofencing;
+import IGnssNi;
+import IGnssXtra;
+
+/* Represents the standard GNSS interface. */
+interface IGnss {
+    /* Requested operational mode for GNSS operation. */
+    enum GnssPositionMode : uint32_t {
+        /** Mode for running GNSS standalone (no assistance). */
+        STANDALONE  = 0,
+        /** AGNSS MS-Based mode. */
+        MS_BASED    = 1,
+        /*
+         * AGNSS MS-Assisted mode. This mode is not maintained by the platform anymore.
+         * It is strongly recommended to use MS_BASED instead.
+         */
+        MS_ASSISTED = 2,
+    };
+
+    /* Requested recurrence mode for GNSS operation. */
+    enum GnssPositionRecurrence : uint32_t {
+        /** Receive GNSS fixes on a recurring basis at a specified period. */
+        RECURRENCE_PERIODIC  = 0,
+        /** Request a single shot GNSS fix. */
+        RECURRENCE_SINGLE    = 1
+    };
+
+    /*
+     * Flags used to specify which aiding data to delete when calling
+     * deleteAidingData().
+     */
+    enum GnssAidingData : uint16_t {
+        DELETE_EPHEMERIS    = 0x0001,
+        DELETE_ALMANAC      = 0x0002,
+        DELETE_POSITION     = 0x0004,
+        DELETE_TIME         = 0x0008,
+        DELETE_IONO         = 0x0010,
+        DELETE_UTC          = 0x0020,
+        DELETE_HEALTH       = 0x0040,
+        DELETE_SVDIR        = 0x0080,
+        DELETE_SVSTEER      = 0x0100,
+        DELETE_SADATA       = 0x0200,
+        DELETE_RTI          = 0x0400,
+        DELETE_CELLDB_INFO  = 0x8000,
+        DELETE_ALL          = 0xFFFF
+    };
+
+    /*
+     * Opens the interface and provides the callback routines
+     * to the implementation of this interface.
+     *
+     * @param callback Callback interface for IGnss.
+     *
+     * @return success Returns true on success.
+     */
+    setCallback(IGnssCallback callback) generates (bool success);
+
+    /*
+     * Starts navigating.
+     *
+     * @return success Returns true on success.
+     */
+    start() generates (bool success);
+
+    /*
+     * Stops navigating.
+     *
+     * @return success Returns true on success.
+     */
+    stop() generates (bool success);
+
+    /*
+     * Closes the interface.
+     */
+    cleanup();
+
+    /*
+     * Injects the current time.
+     *
+     * @param timeMs This is the UTC time received from the NTP server, its value
+     * is given in milliseconds since January 1, 1970.
+     * @param timeReferenceMs The corresponding value of
+     * SystemClock.elapsedRealtime() from the device when the NTP response was
+     * received in milliseconds.
+     * @param uncertaintyMs Uncertainty associated with the value represented by
+     * time. Represented in milliseconds.
+     *
+     * @return success Returns true if the operation is successful.
+     *
+    injectTime(GnssUtcTime timeMs, int64_t timeReferenceMs, int32_t uncertaintyMs)
+        generates (bool success);
+
+    /*
+     * Injects current location from another location provider (typically cell
+     * ID).
+     *
+     * @param latitudeDegrees Measured in Degrees.
+     * @param longitudeDegrees Measured in Degrees.
+     * @param accuracyMeters Measured in meters.
+     *
+     * @return success Returns true if successful.
+     */
+    injectLocation(double latitudeDegrees, double longitudeDegrees, float accuracyMeters)
+        generates (bool success);
+
+    /*
+     * Specifies that the next call to start will not use the
+     * information defined in the flags. GnssAidingData value of DELETE_ALL is
+     * passed for a cold start.
+     *
+     * @param aidingDataFlags Flags specifying the aiding data to be deleted.
+     */
+    deleteAidingData(GnssAidingData aidingDataFlags);
+
+    /*
+     * @param mode  Parameter must be one of MS_BASED or STANDALONE.
+     * It is allowed by the platform (and it is recommended) to fallback to
+     * MS_BASED if MS_ASSISTED is passed in, and MS_BASED is supported.
+     * @recurrence GNSS postion recurrence value, either periodic or single.
+     * @param minIntervalMs Represents the time between fixes in milliseconds.
+     * @param preferredAccuracyMeters Represents the requested fix accuracy in meters.
+     * @param preferredTimeMs Represents the requested time to first fix in milliseconds.
+
+     * @return success Returns true if successful.
+     */
+    setPositionMode(GnssPositionMode mode, GnssPositionRecurrence recurrence,
+                    uint32_t minIntervalMs, uint32_t preferredAccuracyMeters,
+                    uint32_t preferredTimeMs)
+        generates (bool success);
+
+    /*
+     * This method returns the IAGnssRil Interface.
+     *
+     * @return infc Handle to the IAGnssRil interface.
+     */
+    getExtensionAGnssRil() generates (IAGnssRil infc);
+
+    /*
+     * This method returns the IGnssGeofencing Interface.
+     *
+     * @return infc Handle to the IGnssGeofencing interface.
+     */
+    getExtensionGnssGeofencing() generates(IGnssGeofencing infc);
+
+    /*
+     * This method returns the IAGnss Interface.
+     *
+     * @return infc Handle to the IAGnss interface.
+     */
+    getExtensionAGnss() generates (IAGnss infc);
+
+    /*
+     * This method returns the IGnssNi interface.
+     *
+     * @return infc Handle to the IGnssNi interface.
+     */
+    getExtensionGnssNi() generates (IGnssNi infc);
+
+    /*
+     * This method returns the IGnssMeasurement interface.
+     *
+     * @return infc Handle to the IGnssMeasurement interface.
+     */
+    getExtensionGnssMeasurement() generates (IGnssMeasurement infc);
+
+    /*
+     * This method returns the IGnssNavigationMessage interface.
+     *
+     * @return infc Handle to the IGnssNavigationMessage interface.
+     */
+    getExtensionGnssNavigationMessage() generates (IGnssNavigationMessage infc);
+
+    /*
+     * This method returns the IGnssXtra interface.
+     *
+     * @return infc Handle to the IGnssXtra interface.
+     */
+    getExtensionXtra() generates (IGnssXtra infc);
+
+};
diff --git a/gnss/1.0/IGnssCallback.hal b/gnss/1.0/IGnssCallback.hal
new file mode 100644
index 0000000..5234688
--- /dev/null
+++ b/gnss/1.0/IGnssCallback.hal
@@ -0,0 +1,222 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+/*
+ * The interface is required for the HAL to communicate certain information
+ * like status and location info back to the platform, the platform implements
+ * the interfaces and passes a handle to the HAL.
+ */
+interface IGnssCallback {
+    /* Flags for the gnssSetCapabilities callback. */
+    enum Capabilities : uint32_t {
+        /*
+         * GNSS HAL schedules fixes for RECURRENCE_PERIODIC mode.
+         * If this is not set, then the framework will use 1000ms for
+         * minInterval and will call start() and stop() to schedule the GNSS.
+         */
+        SCHEDULING     = 1 << 0,
+        /** GNSS supports MS-Based AGNSS mode */
+        MSB            = 1 << 1,
+        /** GNSS supports MS-Assisted AGNSS mode */
+        MSA            = 1 << 2,
+        /** GNSS supports single-shot fixes */
+        SINGLE_SHOT    = 1 << 3,
+        /** GNSS supports on demand time injection */
+        ON_DEMAND_TIME = 1 << 4,
+        /** GNSS supports Geofencing  */
+        GEOFENCING     = 1 << 5,
+        /** GNSS supports Measurements. */
+        MEASUREMENTS   = 1 << 6,
+        /** GNSS supports Navigation Messages */
+        NAV_MESSAGES   = 1 << 7,
+    };
+
+    /* GNSS status event values. */
+    enum GnssStatusValue : uint16_t {
+        /** GNSS status unknown. */
+        STATUS_NONE    = 0,
+        /** GNSS has begun navigating. */
+        SESSION_BEGIN  = 1,
+        /** GNSS has stopped navigating. */
+        SESSION_END    = 2,
+        /** GNSS has powered on but is not navigating. */
+        ENGINE_ON      = 3,
+        /** GNSS is powered off. */
+        ENGINE_OFF     = 4
+    };
+
+    /*
+     * Flags that indicate information about the satellite
+     */
+    enum GnssSvFlags : uint8_t {
+        FLAGS_NONE          = 0,
+        HAS_EPHEMERIS_DATA  = 1 << 0,
+        HAS_ALMANAC_DATA    = 1 << 1,
+        USED_IN_FIX         = 1 << 2
+    };
+
+    struct GnssSvInfo {
+        /*
+         * Pseudo-random number for the SV, or FCN/OSN number for Glonass. The
+         * distinction is made by looking at constellation field. Values must be
+         * in the range of:
+         *
+         * - GNSS:    1-32
+         * - SBAS:    120-151, 183-192
+         * - GLONASS: 1-24, the orbital slot number (OSN), if known.  Or, if not:
+         *            93-106, the frequency channel number (FCN) (-7 to +6) offset by
+         *            + 100
+         *            i.e. report an FCN of -7 as 93, FCN of 0 as 100, and FCN of +6
+         *            as 106.
+         * - QZSS:    193-200
+         * - Galileo: 1-36
+         * - Beidou:  1-37
+         */
+        int16_t svid;
+
+        /*
+         * Defines the constellation of the given SV.
+         */
+        GnssConstellationType constellation;
+
+        /*
+         * Carrier-to-noise density in dB-Hz, typically in the range [0, 63].
+         * It contains the measured C/N0 value for the signal at the antenna port.
+         *
+         * This is a mandatory value.
+         */
+        float cN0Dbhz;
+
+        /** Elevation of SV in degrees. */
+        float elevationDegrees;
+
+        /** Azimuth of SV in degrees. */
+        float azimuthDegrees;
+
+        /*
+         * Contains additional data about the given SV.
+         */
+        GnssSvFlags svFlag;
+    };
+
+    /*
+     * Represents SV status.
+     */
+    struct GnssSvStatus {
+        /*
+         * Number of GNSS SVs currently visible, refers to the SVs stored in sv_list
+         */
+        int32_t numSvs;
+
+        /*
+         * Pointer to an array of SVs information for all GNSS constellations,
+         * except GNSS, which is reported using svList
+         */
+        GnssSvInfo[ConstS32:GNSS_MAX_SVS] gnssSvList;
+
+    };
+
+    /*
+     * Called when a GNSS location is available.
+     *
+     * @param location Location information from HAL.
+     */
+    gnssLocationCb(GnssLocation location);
+
+    /*
+     * Called to communicate the status of the GNSS engine.
+     *
+     * @param status Status information from HAL.
+     */
+    gnssStatusCb(GnssStatusValue status);
+
+    /*
+     * @param svInfo SV status information from HAL.
+     */
+    gnssSvStatusCb(GnssSvStatus svInfo);
+
+    /*
+     * Called when NMEA data is available.
+     * Callback for reporting NMEA sentences.
+     *
+     * @param timestamp Marks the instance of reporting.
+     * @param nmea Follows standard NMEA 0183. Each sentence begins with a '$'
+     * and ends with a carriage return/line feed sequence and can be no longer
+     * than 80 characters of visible text (plus the line terminators). The data
+     * is contained within this single line with data items separated by commas.
+     * The data itself is just ascii text and may extend over multiple sentences
+     * in certain specialized instances but is normally fully contained in one
+     * variable length sentence. The data may vary in the amount of precision
+     * contained in the message. For example time might be indicated to decimal
+     * parts of a second or location may be shown with 3 or even 4 digits after
+     * the decimal point. Programs that read the data must only use the commas
+     * to determine the field boundaries and not depend on column positions.
+     * There is a provision for a checksum at the end of each sentence which may
+     * or may not be checked by the unit that reads the data. The checksum field
+     * consists of a '*' and two hex digits representing an 8 bit exclusive OR
+     * of all characters between, but not including, the '$' and '*'.
+     */
+    gnssNmeaCb(GnssUtcTime timestamp, string nmea);
+
+    /*
+     * Callback to inform framework of the GNSS engine's capabilities.
+     *
+     * @param capabilities Capability parameter is a bit field of
+     * the Capabilities enum.
+     */
+    gnssSetCapabilitesCb(uint32_t capabilities);
+
+    /*
+     * Callback utility for acquiring the GNSS wakelock. This can be used to prevent
+     * the CPU from suspending while handling GNSS events.
+     */
+    gnssAcquireWakelockCb();
+
+    /** Callback utility for releasing the GNSS wakelock. */
+    gnssReleaseWakelockCb();
+
+    /** Callback for requesting NTP time */
+    gnssRequestTimeCb();
+
+    /*
+     * Provides information about how new the underlying GPS/GNSS hardware and
+     * software is.
+     *
+     * This information will be available for Android Test Applications. If a GNSS
+     * HAL does not provide this information, it will be considered "2015 or
+     * earlier".
+     *
+     * If a GNSS HAL does provide this information, then newer years will need to
+     * meet newer CTS standards. E.g. if the date are 2016 or above, then N+ level
+     * GnssMeasurement support will be verified.
+     */
+    struct GnssSystemInfo{
+        /*
+         * year in which the last update was made to the underlying hardware/firmware
+         * used to capture GNSS signals, e.g. 2016
+         */
+        uint16_t yearOfHw;
+    };
+
+    /*
+     * Callback to inform framework of the engine's hardware version information.
+     *
+     * @param info GnssSystemInfo about the GPS/GNSS hardware.
+     */
+    gnssSetSystemInfoCb(GnssSystemInfo info);
+};
diff --git a/gnss/1.0/IGnssGeofenceCallback.hal b/gnss/1.0/IGnssGeofenceCallback.hal
new file mode 100644
index 0000000..06eb62a
--- /dev/null
+++ b/gnss/1.0/IGnssGeofenceCallback.hal
@@ -0,0 +1,188 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+/*
+ * GNSS Geofence.
+ * There are 3 states associated with a Geofence: Inside, Outside, Unknown.
+ * There are 3 transitions: ENTERED, EXITED, UNCERTAIN.
+ *
+ * An example state diagram with confidence level: 95% and Unknown time limit
+ * set as 30 secs is shown below. (confidence level and Unknown time limit are
+ * explained latter).
+ *                         ____________________________
+ *                        |       Unknown (30 secs)   |
+ *                         """"""""""""""""""""""""""""
+ *                            ^ |                  |  ^
+ *                   UNCERTAIN| |ENTERED     EXITED|  |UNCERTAIN
+ *                            | v                  v  |
+ *                        ________    EXITED     _________
+ *                       | Inside | -----------> | Outside |
+ *                       |        | <----------- |         |
+ *                        """"""""    ENTERED    """""""""
+ *
+ * Inside state: We are 95% confident that the user is inside the geofence.
+ * Outside state: We are 95% confident that the user is outside the geofence
+ * Unknown state: Rest of the time.
+ *
+ * The Unknown state is better explained with an example:
+ *
+ *                            __________
+ *                           |         c|
+ *                           |  ___     |    _______
+ *                           |  |a|     |   |   b   |
+ *                           |  """     |    """""""
+ *                           |          |
+ *                            """"""""""
+ * In the diagram above, "a" and "b" are 2 geofences and "c" is the accuracy
+ * circle reported by the GNSS subsystem. Now with regard to "b", the system is
+ * confident that the user is outside. But with regard to "a" is not confident
+ * whether it is inside or outside the geofence. If the accuracy remains the
+ * same for a sufficient period of time, the UNCERTAIN transition must be
+ * triggered with the state set to Unknown. If the accuracy improves later, an
+ * appropriate transition must be triggered.  This "sufficient period of time"
+ * is defined by the parameter in the addGeofenceArea API.
+ * In other words, Unknown state can be interpreted as a state in which the
+ * GNSS subsystem isn't confident enough that the user is either inside or
+ * outside the Geofence. It moves to Unknown state only after the expiry of the
+ * timeout.
+ *
+ * The geofence callback needs to be triggered for the ENTERED and EXITED
+ * transitions, when the GNSS system is confident that the user has entered
+ * (Inside state) or exited (Outside state) the Geofence. An implementation
+ * which uses a value of 95% as the confidence is recommended. The callback
+ * must be triggered only for the transitions requested by the
+ * addGeofenceArea method.
+ *
+ * Even though the diagram and explanation talks about states and transitions,
+ * the callee is only interested in the transistions. The states are mentioned
+ * here for illustrative purposes.
+ *
+ * Startup Scenario: When the device boots up, if an application adds geofences,
+ * and then we get an accurate GNSS location fix, it needs to trigger the
+ * appropriate (ENTERED or EXITED) transition for every Geofence it knows about.
+ * By default, all the Geofences will be in the Unknown state.
+ *
+ * When the GNSS system is unavailable, gnssGeofenceStatusCb must be
+ * called to inform the upper layers of the same. Similarly, when it becomes
+ * available the callback must be called. This is a global state while the
+ * UNKNOWN transition described above is per geofence.
+ *
+ * An important aspect to note is that users of this API (framework), will use
+ * other subsystems like wifi, sensors, cell to handle Unknown case and
+ * hopefully provide a definitive state transition to the third party
+ * application. GNSS Geofence will just be a signal indicating what the GNSS
+ * subsystem knows about the Geofence.
+ *
+ */
+
+interface IGnssGeofenceCallback {
+    enum GeofenceTransition : int32_t {
+        ENTERED   = (1 << 0L),
+        EXITED    = (1 << 1L),
+        UNCERTAIN = (1 << 2L),
+    };
+
+    enum GeofenceAvailability : int32_t {
+        UNAVAILABLE = (1 << 0L),
+        AVAILABLE   = (1 << 1L),
+    };
+
+    enum GeofenceStatus : int32_t {
+        OPERATION_SUCCESS        = 0,
+        ERROR_TOO_MANY_GEOFENCES = -100,
+        ERROR_ID_EXISTS          = -101,
+        ERROR_ID_UNKNOWN         = -102,
+        ERROR_INVALID_TRANSITION = -103,
+        ERROR_GENERIC            = -149
+    };
+
+    /*
+     * The callback associated with the geofence transition.
+     * The callback must only be called when the caller is interested in that
+     * particular transition. For instance, if the caller is interested only in
+     * ENTERED transition, then the callback must not be called with the EXITED
+     * transition.
+     *
+     * IMPORTANT: If a transition is triggered resulting in this callback, the
+     * GNSS subsystem will wake up the application processor, if its in suspend
+     * state.
+     *
+     * @param geofenceId The id associated with the addGeofenceArea.
+     * @param location The current GNSS location.
+     * @param transition Can be one of ENTERED, EXITED or UNCERTAIN.
+     * @param timestamp Timestamp when the transition was detected.
+     *
+     */
+    gnssGeofenceTransitionCb(int32_t geofenceId, GnssLocation location,
+        GeofenceTransition transition, GnssUtcTime timestamp);
+
+    /*
+     * The callback associated with the availability of the GNSS system for
+     * geofencing monitoring. If the GNSS system determines that it cannot monitor
+     * geofences because of lack of reliability or unavailability of the GNSS
+     * signals, it will call this callback with UNAVAILABLE parameter.
+     *
+     * @param status - UNAVAILABLE or AVAILABLE.
+     * @param lastLocation - Last known location.
+     */
+    gnssGeofenceStatusCb(GeofenceAvailability status, GnssLocation lastLocation);
+
+    /*
+     * The callback associated with the addGeofence call.
+     *
+     * @param geofenceId Id of the geofence.
+     * @param status Will be OPERATION_SUCCESS if the geofence
+     * add was successful. Will be ERROR_TOO_MANY_GEOFENCES if the
+     * geofence limit has been reached.
+     * Will be ERROR_ID_EXISTS if geofence with id already exists.
+     * Will be ERROR_INVALID_TRANSITION if the monitorTransition contains an
+     * invalid transition.
+     * Will be ERROR_GENERIC for other errors.
+     */
+    gnssGeofenceAddCb(int32_t geofenceId, GeofenceStatus status);
+
+    /*
+     * The callback associated with the removeGeofence call.
+     *
+     * @param geofenceId Id of the geofence.
+     * @param status Will return OPERATION_SUCCESS if successful.
+     * Will be ERROR_ID_UNKNOWN for invalid id and
+     * ERROR_GENERIC for others.
+     */
+    gnssGeofenceRemoveCb(int32_t geofenceId, GeofenceStatus status);
+
+    /*
+     * The callback associated with the pauseGeofence call.
+     *
+     * @param geofenceId Id of the geofence.
+     * @param status Will be OPERATION_SUCCESS if success.
+     * Will be ERROR_ID_UNKNOWN for invalid id. Will be
+     * ERROR_INVALID_TRANSITION when monitorTransitions is invalid.
+     * Will be ERROR_GENERIC for other err errors.
+     */
+    gnssGeofencePauseCb(int32_t geofenceId, GeofenceStatus status);
+
+    /*
+     * The callback associated with the resumeGeofence call.
+     *
+     * @param geofenceId - Id of the geofence.
+     * @param status Will be OPERATION_SUCCESS if successful.
+     * Will be ERROR_ID_UNKNOWN for invalid id and ERROR_GENERIC for others.
+     */
+    gnssGeofenceResumeCb(int32_t geofenceId, GeofenceStatus status);
+};
diff --git a/gnss/1.0/IGnssGeofencing.hal b/gnss/1.0/IGnssGeofencing.hal
new file mode 100644
index 0000000..89301f4
--- /dev/null
+++ b/gnss/1.0/IGnssGeofencing.hal
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+import IGnssGeofenceCallback;
+
+/* Extended interface for GNSS Geofencing support */
+interface IGnssGeofencing {
+    /*
+     * Opens the geofence interface and provides the callback routines
+     * to the HAL.
+     *
+     * @param callback Handle to the IGnssGeofenceCallback interface.
+     */
+    setCallback(IGnssGeofenceCallback callback);
+
+    /*
+     * Add a geofence area. This api currently supports circular geofences.
+     *
+     * @param geofenceId The id for the geofence. If a geofence with this id
+     * already exists, an error value (ERROR_ID_EXISTS) must be returned.
+     * @param latitudeDegrees The latitude(in degrees) for the geofence lastTransition.
+     * @param longtitudeDegrees The longitude(in degrees) for the geofence lastTransition.
+     * @param radiusMeters The radius(in meters) for the geofence lastTransition.
+     * @param lastTransition The current state of the geofence. For example, if
+     * the system already knows that the user is inside the geofence, this will
+     * be set to ENTERED. In most cases, it will be UNCERTAIN.
+     * @param monitorTransitions - Which transitions to monitor. Bitwise OR of
+     * ENTERED, EXITED and UNCERTAIN.
+     * @param notificationResponsivenessMs - Defines the best-effort description
+     * of how soon must the callback be called when the transition associated
+     * with the Geofence is triggered. For instance, if set to 1000 millseconds
+     * with ENTERED, the callback must be called 1000 milliseconds within entering
+     * the geofence. This parameter is defined in milliseconds.
+     * NOTE: This is not to be confused with the rate that the GNSS is polled at.
+     * It is acceptable to dynamically vary the rate of sampling the GNSS for
+     * power-saving reasons; thus the rate of sampling may be faster or slower
+     * than this.
+     * @param unknownTimerMs - The time limit after which the UNCERTAIN transition
+     * must be triggered. This parameter is defined in milliseconds.
+     */
+    addGeofenceArea(int32_t geofenceId, double latitudeDegrees, double longitudeDegrees,
+        double radiusMeters, GeofenceTransition lastTransition,
+        int32_t monitorTransitions, uint32_t notificationResponsivenessMs,
+        uint32_t unknownTimerMs);
+
+    /*
+     * Pause monitoring a particular geofence.
+     *
+     * @param geofenceId The id for the geofence.
+     */
+    pauseGeofence(int32_t geofenceId);
+
+    /*
+     * Resume monitoring a particular geofence.
+     *
+     * @param geofenceId - The id for the geofence.
+     * @param monitorTransitions Specifies which transitions to monitor.
+     * It can be a bitwise OR of ENTERED, EXITED and
+     * UNCERTAIN. This supersedes the value associated
+     * provided in the addGeofenceArea call.
+     */
+    resumeGeofence(int32_t geofenceId, int32_t monitorTransitions);
+
+    /*
+     * Remove a geofence area. After the function returns, no notifications
+     * must be sent.
+     *
+     * @param geofenceId The id of the geofence.
+     */
+    removeGeofenceArea(int32_t geofenceId);
+};
diff --git a/gnss/1.0/IGnssMeasurement.hal b/gnss/1.0/IGnssMeasurement.hal
new file mode 100644
index 0000000..5156b32
--- /dev/null
+++ b/gnss/1.0/IGnssMeasurement.hal
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+import IGnssMeasurementCallback;
+
+/*
+ * Extended interface for GNSS Measurements support.
+ */
+interface IGnssMeasurement {
+    enum GnssMeasurementStatus : int32_t {
+        SUCCESS = 0,
+        ERROR_ALREADY_INIT = -100,
+        ERROR_GENERIC = -101
+    };
+
+    /*
+     * Initializes the interface and registers the callback routines with the HAL.
+     * After a successful call to 'setCallback' the HAL must begin to provide updates at
+     * an average output rate of 1Hz (occasional
+     * intra-measurement time offsets in the range from 0-2000msec can be
+     * tolerated.)
+     *
+     * @param callback Handle to GnssMeasurement callback interface.
+     *
+     * @return initRet Returns SUCCESS if successful.
+     * Returns ERROR_ALREADY_INIT if a callback has already been
+     * registered without a corresponding call to 'close'.
+     * Returns ERROR_GENERIC for any other error. The HAL must
+     * not generate any other updates upon returning this error code.
+     */
+    setCallback(IGnssMeasurementCallback callback) generates (int32_t initRet);
+
+    /*
+     * Stops updates from the HAL, and unregisters the callback routines.
+     * After a call to close(), the previously registered callbacks must be
+     * considered invalid by the HAL.
+     * If close() is invoked without a previous setCallback, this function must perform
+     * no work.
+     */
+    close();
+
+};
diff --git a/gnss/1.0/IGnssMeasurementCallback.hal b/gnss/1.0/IGnssMeasurementCallback.hal
new file mode 100644
index 0000000..3650892
--- /dev/null
+++ b/gnss/1.0/IGnssMeasurementCallback.hal
@@ -0,0 +1,554 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+/* The callback interface to report measurements from the HAL. */
+interface IGnssMeasurementCallback {
+    /*
+     * Flags to indicate what fields in GnssClock are valid.
+     */
+    enum GnssClockFlags : uint16_t {
+        /** A valid 'leap second' is stored in the data structure. */
+        HAS_LEAP_SECOND        = 1 << 0,
+        /** A valid 'time uncertainty' is stored in the data structure. */
+        HAS_TIME_UNCERTAINTY   = 1 << 1,
+        /** A valid 'full bias' is stored in the data structure. */
+        HAS_FULL_BIAS          = 1 << 2,
+        /** A valid 'bias' is stored in the data structure. */
+        HAS_BIAS               = 1 << 3,
+        /** A valid 'bias uncertainty' is stored in the data structure. */
+        HAS_BIAS_UNCERTAINTY   = 1 << 4,
+        /** A valid 'drift' is stored in the data structure. */
+        HAS_DRIFT              = 1 << 5,
+        /** A valid 'drift uncertainty' is stored in the data structure. */
+        HAS_DRIFT_UNCERTAINTY  = 1 << 6
+    };
+
+    /*
+     * Flags to indicate what fields in GnssMeasurement are valid.
+     */
+    enum GnssMeasurementFlags : uint32_t {
+        /** A valid 'snr' is stored in the data structure. */
+        HAS_SNR                        = 1 << 0,
+        /** A valid 'carrier frequency' is stored in the data structure. */
+        HAS_CARRIER_FREQUENCY          = 1 << 9,
+        /** A valid 'carrier cycles' is stored in the data structure. */
+        HAS_CARRIER_CYCLES             = 1 << 10,
+        /** A valid 'carrier phase' is stored in the data structure. */
+        HAS_CARRIER_PHASE              = 1 << 11,
+        /** A valid 'carrier phase uncertainty' is stored in the data structure. */
+        HAS_CARRIER_PHASE_UNCERTAINTY  = 1 << 12
+    };
+
+    /*
+     * Enumeration of available values for the GNSS Measurement's multipath
+     * indicator.
+     */
+    enum GnssMultipathIndicator : uint8_t {
+        /** The indicator is not available or unknown. */
+        INDICATOR_UNKNOWN      = 0,
+        /** The measurement is indicated to be affected by multipath. */
+        INDICATOR_PRESENT      = 1,
+        /** The measurement is indicated to be not affected by multipath. */
+        INDICATIOR_NOT_PRESENT = 2
+    };
+
+    /*
+     * Flags indicating the GNSS measurement state.
+     *
+     * The expected behavior here is for GNSS HAL to set all the flags that applies.
+     * For example, if the state for a satellite is only C/A code locked and bit
+     * synchronized, and there is still millisecond ambiguity, the state must be
+     * set as:
+     *
+     * STATE_CODE_LOCK | STATE_BIT_SYNC |  STATE_MSEC_AMBIGUOUS
+     *
+     * If GNSS is still searching for a satellite, the corresponding state must be
+     * set to STATE_UNKNOWN(0).
+     */
+    enum GnssMeasurementState : uint32_t {
+        STATE_UNKNOWN                = 0,
+        STATE_CODE_LOCK              = 1 << 0,
+        STATE_BIT_SYNC               = 1 << 1,
+        STATE_SUBFRAME_SYNC          = 1 << 2,
+        STATE_TOW_DECODED            = 1 << 3,
+        STATE_MSEC_AMBIGUOUS         = 1 << 4,
+        STATE_SYMBOL_SYNC            = 1 << 5,
+        STATE_GLO_STRING_SYNC        = 1 << 6,
+        STATE_GLO_TOD_DECODED        = 1 << 7,
+        STATE_BDS_D2_BIT_SYNC        = 1 << 8,
+        STATE_BDS_D2_SUBFRAME_SYNC   = 1 << 9,
+        STATE_GAL_E1BC_CODE_LOCK     = 1 << 10,
+        STATE_GAL_E1C_2ND_CODE_LOCK  = 1 << 11,
+        STATE_GAL_E1B_PAGE_SYNC      = 1 << 12,
+        STATE_SBAS_SYNC              = 1 << 13
+    };
+
+    /*
+     * Flags indicating the Accumulated Delta Range's states.
+     */
+    enum GnssAccumulatedDeltaRangeState : uint16_t {
+        ADR_STATE_UNKNOWN    = 0,
+        ADR_STATE_VALID      = 1 << 0,
+        ADR_STATE_RESET      = 1 << 1,
+        ADR_STATE_CYCLE_SLIP = 1 << 2,
+    };
+
+    /*
+     * Represents an estimate of the GNSS clock time.
+     */
+    struct GnssClock {
+        /*
+         * A set of flags indicating the validity of the fields in this data
+         * structure.
+         */
+        GnssClockFlags gnssClockFlags;
+
+        /*
+         * Leap second data.
+         * The sign of the value is defined by the following equation:
+         *      utcTimeNs = timeNs - (fullBiasNs + biasNs) - leapSecond *
+         *      1,000,000,000
+         *
+         * If this data is available, gnssClockFlags must contain
+         * HAS_LEAP_SECOND.
+         */
+        int16_t leapSecond;
+
+        /*
+         * The GNSS receiver internal clock value. This is the local hardware clock
+         * value.
+         *
+         * For local hardware clock, this value is expected to be monotonically
+         * increasing while the hardware clock remains powered on. (For the case of a
+         * HW clock that is not continuously on, see the
+         * hwClockDiscontinuityCount field). The receiver's estimate of GNSS time
+         * can be derived by subtracting the sum of fullBiasNs and biasNs (when
+         * available) from this value.
+         *
+         * This GNSS time must be the best estimate of current GNSS time
+         * that GNSS receiver can achieve.
+         *
+         * Sub-nanosecond accuracy can be provided by means of the 'biasNs' field.
+         * The value contains the timeUncertaintyNs in it.
+         *
+         * This field is mandatory.
+         */
+        int64_t timeNs;
+
+        /*
+         * 1-Sigma uncertainty associated with the clock's time in nanoseconds.
+         * The uncertainty is represented as an absolute (single sided) value.
+         *
+         * If the data is available, gnssClockFlags must contain
+         * HAS_TIME_UNCERTAINTY. Ths value is ideally zero, as the time
+         * 'latched' by timeNs is defined as the reference clock vs. which all
+         * other times (and corresponding uncertainties) are measured.
+         */
+        double timeUncertaintyNs;
+
+        /*
+         * The difference between hardware clock ('time' field) inside GNSS receiver
+         * and the true GNSS time since 0000Z, January 6, 1980, in nanoseconds.
+         *
+         * The sign of the value is defined by the following equation:
+         *      local estimate of GNSS time = timeNs - (fullBiasNs + biasNs)
+         *
+         * This value is mandatory if the receiver has estimated GNSS time. If the
+         * computed time is for a non-GNSS constellation, the time offset of that
+         * constellation to GNSS has to be applied to fill this value. The error
+         * estimate for the sum of this and the biasNs is the biasUncertaintyNs,
+         * and the caller is responsible for using this uncertainty (it can be very
+         * large before the GNSS time has been solved for.) If the data is available
+         * gnssClockFlags must contain HAS_FULL_BIAS.
+         */
+        int64_t fullBiasNs;
+
+        /*
+         * Sub-nanosecond bias.
+         * The error estimate for the sum of this and the fullBiasNs is the
+         * biasUncertaintyNs.
+         *
+         * If the data is available gnssClockFlags must contain HAS_BIAS. If GNSS
+         * has computed a position fix. This value is mandatory if the receiver has
+         * estimated GNSS time.
+         */
+        double biasNs;
+
+        /*
+         * 1-Sigma uncertainty associated with the local estimate of GNSS time (clock
+         * bias) in nanoseconds. The uncertainty is represented as an absolute
+         * (single sided) value.
+         *
+         * If the data is available gnssClockFlags must contain
+         * HAS_BIAS_UNCERTAINTY. This value is mandatory if the receiver
+         * has estimated GNSS time.
+         */
+        double biasUncertaintyNs;
+
+        /*
+         * The clock's drift in nanoseconds (per second).
+         *
+         * A positive value means that the frequency is higher than the nominal
+         * frequency, and that the (fullBiasNs + biasNs) is growing more positive
+         * over time.
+         *
+         * The value contains the 'drift uncertainty' in it.
+         * If the data is available gnssClockFlags must contain HAS_DRIFT.
+         *
+         * This value is mandatory if the receiver has estimated GNSS time.
+         */
+        double driftNsps;
+
+        /*
+         * 1-Sigma uncertainty associated with the clock's drift in nanoseconds (per
+         * second).
+         * The uncertainty is represented as an absolute (single sided) value.
+         *
+         * If the data is available gnssClockFlags must contain
+         * HAS_DRIFT_UNCERTAINTY. If GNSS has computed a position fix this
+         * field is mandatory and must be populated.
+         */
+        double driftUncertaintyNsps;
+
+        /*
+         * When there are any discontinuities in the HW clock, this field is
+         * mandatory.
+         *
+         * A "discontinuity" is meant to cover the case of a switch from one source
+         * of clock to another.  A single free-running crystal oscillator (XO)
+         * will generally not have any discontinuities, and this can be set and
+         * left at 0.
+         *
+         * If, however, the timeNs value (HW clock) is derived from a composite of
+         * sources, that is not as smooth as a typical XO, or is otherwise stopped &
+         * restarted, then this value shall be incremented each time a discontinuity
+         * occurs.  (E.g. this value can start at zero at device boot-up and
+         * increment each time there is a change in clock continuity. In the
+         * unlikely event that this value reaches full scale, rollover (not
+         * clamping) is required, such that this value continues to change, during
+         * subsequent discontinuity events.)
+         *
+         * While this number stays the same, between GnssClock reports, it can be
+         * safely assumed that the timeNs value has been running continuously, e.g.
+         * derived from a single, high quality clock (XO like, or better, that is
+         * typically used during continuous GNSS signal sampling.)
+         *
+         * It is expected, esp. during periods where there are few GNSS signals
+         * available, that the HW clock be discontinuity-free as long as possible,
+         * as this avoids the need to use (waste) a GNSS measurement to fully
+         * re-solve for the GNSS clock bias and drift, when using the accompanying
+         * measurements, from consecutive GnssData reports.
+         */
+        uint32_t hwClockDiscontinuityCount;
+
+    };
+
+    /*
+     * Represents a GNSS Measurement, it contains raw and computed information.
+     *
+     * All signal measurement information (e.g. svTime,
+     * pseudorangeRate, multipathIndicator) reported in this struct must be
+     * based on GNSS signal measurements only. You must not synthesize measurements
+     * by calculating or reporting expected measurements based on known or estimated
+     * position, velocity, or time.
+     */
+    struct GnssMeasurement{
+        /*
+         * A set of flags indicating the validity of the fields in this data
+         * structure.
+         */
+        GnssMeasurementFlags flags;
+
+        /*
+         * Satellite vehicle ID number, as defined in GnssSvInfo::svid
+         * This is a mandatory value.
+         */
+        int16_t svid;
+
+        /*
+         * Defines the constellation of the given SV.
+         */
+        GnssConstellationType constellation;
+
+        /*
+         * Time offset at which the measurement was taken in nanoseconds.
+         * The reference receiver's time is specified by GnssData::clock::timeNs.
+         *
+         * The sign of timeOffsetNs is given by the following equation:
+         *      measurement time = GnssClock::timeNs + timeOffsetNs
+         *
+         * It provides an individual time-stamp for the measurement, and allows
+         * sub-nanosecond accuracy.
+         * This is a mandatory value.
+         */
+        double timeOffsetNs;
+
+        /*
+         * Per satellite sync state. It represents the current sync state for the
+         * associated satellite.
+         * Based on the sync state, the 'received GNSS tow' field must be interpreted
+         * accordingly.
+         *
+         * This is a mandatory value.
+         */
+        GnssMeasurementState state;
+
+        /*
+         * The received GNSS Time-of-Week at the measurement time, in nanoseconds.
+         * For GNSS & QZSS, this is the received GNSS Time-of-Week at the
+         * measurement time, in nanoseconds. The value is relative to the
+         * beginning of the current GNSS week.
+         *
+         * Given the highest sync state that can be achieved, per each satellite,
+         * valid range for this field can be:
+         * Searching       : [ 0       ] : STATE_UNKNOWN
+         * C/A code lock   : [ 0 1ms   ] : STATE_CODE_LOCK set
+         * Bit sync        : [ 0 20ms  ] : STATE_BIT_SYNC set
+         * Subframe sync   : [ 0  6s   ] : STATE_SUBFRAME_SYNC set
+         * TOW decoded     : [ 0 1week ] : STATE_TOW_DECODED set
+         *
+         * Note: If there is any ambiguity in integer millisecond,
+         * GNSS_MEASUREMENT_STATE_MSEC_AMBIGUOUS must be set accordingly, in the
+         * 'state' field.
+         *
+         * This value must be populated if 'state' != STATE_UNKNOWN.
+         *
+         * For Glonass, this is the received Glonass time of day, at the
+         * measurement time in nanoseconds.
+         *
+         * Given the highest sync state that can be achieved, per each satellite,
+         * valid range for this field can be:
+         * Searching       : [ 0       ] : STATE_UNKNOWN set
+         * C/A code lock   : [ 0   1ms ] : STATE_CODE_LOCK set
+         * Symbol sync     : [ 0  10ms ] : STATE_SYMBOL_SYNC set
+         * Bit sync        : [ 0  20ms ] : STATE_BIT_SYNC set
+         * String sync     : [ 0    2s ] : STATE_GLO_STRING_SYNC set
+         * Time of day     : [ 0  1day ] : STATE_GLO_TOW_DECODED set
+         *
+         * For Beidou, this is the received Beidou time of week,
+         * at the measurement time in nanoseconds.
+         *
+         * Given the highest sync state that can be achieved, per each satellite,
+         * valid range for this field can be:
+         * Searching    : [ 0       ] : STATE_UNKNOWN set.
+         * C/A code lock: [ 0   1ms ] : STATE_CODE_LOCK set.
+         * Bit sync (D2): [ 0   2ms ] : STATE_BDS_D2_BIT_SYNC set.
+         * Bit sync (D1): [ 0  20ms ] : STATE_BIT_SYNC set.
+         * Subframe (D2): [ 0  0.6s ] : STATE_BDS_D2_SUBFRAME_SYNC set.
+         * Subframe (D1): [ 0    6s ] : STATE_SUBFRAME_SYNC set.
+         * Time of week : [ 0 1week ] : STATE_TOW_DECODED set.
+         *
+         * For Galileo, this is the received Galileo time of week,
+         * at the measurement time in nanoseconds.
+         *
+         * E1BC code lock   : [ 0  4ms ] : STATE_GAL_E1BC_CODE_LOCK set.
+         * E1C 2nd code lock: [ 0 100ms] : STATE_GAL_E1C_2ND_CODE_LOCK set.
+         * E1B page         : [ 0   2s ] : STATE_GAL_E1B_PAGE_SYNC set.
+         * Time of week     : [ 0 1week] : STATE_TOW_DECODED is set.
+         *
+         * For SBAS, this is received SBAS time, at the measurement time in
+         * nanoseconds.
+         *
+         * Given the highest sync state that can be achieved, per each satellite,
+         * valid range for this field can be:
+         * Searching    : [ 0     ] : STATE_UNKNOWN
+         * C/A code lock: [ 0 1ms ] : STATE_CODE_LOCK is set
+         * Symbol sync  : [ 0 2ms ] : STATE_SYMBOL_SYNC is set
+         * Message      : [ 0  1s ] : STATE_SBAS_SYNC is set
+         */
+        int64_t receivedSvTimeInNs;
+
+        /*
+         * 1-Sigma uncertainty of the Received GNSS Time-of-Week in nanoseconds.
+         *
+         * This value must be populated if 'state' != STATE_UNKNOWN.
+         */
+        int64_t receivedSvTimeUncertaintyInNs;
+
+        /*
+         * Carrier-to-noise density in dB-Hz, typically in the range [0, 63].
+         * It contains the measured C/N0 value for the signal at the antenna port.
+         *
+         * This is a mandatory value.
+         */
+        double cN0DbHz;
+
+        /*
+         * Pseudorange rate at the timestamp in m/s. The correction of a given
+         * Pseudorange Rate value includes corrections for receiver and satellite
+         * clock frequency errors. Ensure that this field is independent (see
+         * comment at top of GnssMeasurement struct.)
+         *
+         * It is mandatory to provide the 'uncorrected' 'pseudorange rate', and
+         * provide GnssClock's 'drift' field as well. When providing the
+         * uncorrected pseudorange rate, do not apply the corrections described above.)
+         *
+         * The value includes the 'pseudorange rate uncertainty' in it.
+         * A positive 'uncorrected' value indicates that the SV is moving away from
+         * the receiver.
+         *
+         * The sign of the 'uncorrected' 'pseudorange rate' and its relation to the
+         * sign of 'doppler shift' is given by the equation:
+         *      pseudorange rate = -k * doppler shift   (where k is a constant)
+         *
+         * This must be the most accurate pseudorange rate available, based on
+         * fresh signal measurements from this channel.
+         *
+         * It is mandatory that this value be provided at typical carrier phase PRR
+         * quality (few cm/sec per second of uncertainty, or better) - when signals
+         * are sufficiently strong & stable, e.g. signals from a GNSS simulator at >=
+         * 35 dB-Hz.
+         */
+        double pseudorangeRateMps;
+
+        /*
+         * 1-Sigma uncertainty of the pseudorangeRateMps.
+         * The uncertainty is represented as an absolute (single sided) value.
+         *
+         * This is a mandatory value.
+         */
+        double pseudorangeRateUncertaintyMps;
+
+        /*
+         * Accumulated delta range's state. It indicates whether ADR is reset or
+         * there is a cycle slip(indicating loss of lock).
+         *
+         * This is a mandatory value.
+         */
+        GnssAccumulatedDeltaRangeState accumulatedDeltaRangeState;
+
+        /*
+         * Accumulated delta range since the last channel reset in meters.
+         * A positive value indicates that the SV is moving away from the receiver.
+         *
+         * The sign of the 'accumulated delta range' and its relation to the sign of
+         * 'carrier phase' is given by the equation:
+         * accumulated delta range = -k * carrier phase (where k is a constant)
+         *
+         * This value must be populated if 'accumulated delta range state' !=
+         * ADR_STATE_UNKNOWN.
+         * However, it is expected that the data is only accurate when:
+         *      'accumulated delta range state' == ADR_STATE_VALID.
+         */
+        double accumulatedDeltaRangeM;
+
+        /*
+         * 1-Sigma uncertainty of the accumulated delta range in meters.
+         * This value must be populated if 'accumulated delta range state' !=
+         * ADR_STATE_UNKNOWN.
+         */
+        double accumulatedDeltaRangeUncertaintyM;
+
+        /*
+         * Carrier frequency at which codes and messages are modulated, it can
+         * be L1 or L2. If the field is not set, the carrier frequency is
+         * assumed to be L1.
+         *
+         * If the data is available, gnssClockFlags must contain
+         * HAS_CARRIER_FREQUENCY.
+         */
+        float carrierFrequencyHz;
+
+        /*
+         * The number of full carrier cycles between the satellite and the
+         * receiver. The reference frequency is given by the field
+         * 'carrierFrequencyHz'. Indications of possible cycle slips and
+         * resets in the accumulation of this value can be inferred from the
+         * accumulatedDeltaRangeState flags.
+         *
+         * If the data is available, gnssClockFlags must contain
+         * HAS_CARRIER_CYCLES.
+         */
+        int64_t carrierCycles;
+
+        /*
+         * The RF phase detected by the receiver, in the range [0.0, 1.0].
+         * This is usually the fractional part of the complete carrier phase
+         * measurement.
+         *
+         * The reference frequency is given by the field 'carrierFrequencyHz'.
+         * The value contains the 'carrier-phase uncertainty' in it.
+         *
+         * If the data is available, gnssClockFlags must contain
+         * HAS_CARRIER_PHASE.
+         */
+        double carrierPhase;
+
+        /*
+         * 1-Sigma uncertainty of the carrier-phase.
+         * If the data is available, gnssClockFlags must contain
+         * HAS_CARRIER_PHASE_UNCERTAINTY.
+         */
+        double carrierPhaseUncertainty;
+
+        /*
+         * An enumeration that indicates the 'multipath' state of the event.
+         *
+         * The multipath Indicator is intended to report the presence of overlapping
+         * signals that manifest as distorted correlation peaks.
+         *
+         * - if there is a distorted correlation peak shape, report that multipath
+         *   is MULTIPATH_INDICATOR_PRESENT.
+         * - if there is no distorted correlation peak shape, report
+         *   MULTIPATH_INDICATOR_NOT_PRESENT
+         * - if signals are too weak to discern this information, report
+         *   MULTIPATH_INDICATOR_UNKNOWN
+         *
+         * Example: when doing the standardized overlapping Multipath Performance
+         * test (3GPP TS 34.171) the Multipath indicator must report
+         * MULTIPATH_INDICATOR_PRESENT for those signals that are tracked, and
+         * contain multipath, and MULTIPATH_INDICATOR_NOT_PRESENT for those
+         * signals that are tracked and do not contain multipath.
+         */
+        GnssMultipathIndicator multipathIndicator;
+
+        /*
+         * Signal-to-noise ratio at correlator output in dB.
+         * If the data is available, gnssClockFlags must contain MEASUREMENT_HAS_SNR.
+         * This is the power ratio of the "correlation peak height above the
+         * observed noise floor" to "the noise RMS".
+         */
+        double snrDb;
+    };
+
+    /*
+     * Represents a reading of GNSS measurements. For devices where GnssSystemInfo's
+     * yearOfHw is set to 2016+, it is mandatory that these be provided, on
+     * request, when the GNSS receiver is searching/tracking signals.
+     *
+     * - Reporting of GNSS constellation measurements is mandatory.
+     * - Reporting of all tracked constellations are encouraged.
+     */
+    struct GnssData {
+        /* Number of GnssMeasurement elements. */
+        uint32_t measurementCount;
+
+        /* The array of measurements. */
+        GnssMeasurement[ConstS32:GNSS_MAX_MEASUREMENT] measurements;
+
+        /** The GNSS clock time reading. */
+        GnssClock clock;
+    };
+
+    /*
+     * Callback for the hal to pass a GnssData structure back to the client.
+     *
+     * @param data Contains a reading of GNSS measurements.
+     */
+    GnssMeasurementCb(GnssData data);
+};
diff --git a/gnss/1.0/IGnssNavigationMessage.hal b/gnss/1.0/IGnssNavigationMessage.hal
new file mode 100644
index 0000000..d59b538
--- /dev/null
+++ b/gnss/1.0/IGnssNavigationMessage.hal
@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+import IGnssNavigationMessageCallback;
+
+/*
+ * Extended interface for GNSS navigation message reporting support.
+ */
+interface IGnssNavigationMessage {
+    enum GnssNavigationMessageStatus : int32_t {
+        SUCCESS = 0,
+        ERROR_ALREADY_INIT = -100,
+        ERROR_GENERIC = -101
+    };
+
+    /*
+     * Initializes the interface and registers the callback routines with the HAL.
+     * After a successful call to 'setCallback' the HAL must begin to provide updates as
+     * they become available.
+     * @param callback handle to IGnssNavigationMessageCallack interface.
+     *
+     * @return initRet Returns SUCCESS if the operation
+     * is successful.
+     * Returns ERROR_ALREADY_INIT if a callback has
+     * already been registered without a corresponding call to close().
+     * Returns ERROR_GENERIC if any other error occurred. It is
+     * expected that the HAL will not generate any updates upon returning
+     * this error code.
+     */
+     setCallback(IGnssNavigationMessageCallback callback) generates (int32_t initRet);
+
+    /*
+     * Stops updates from the HAL, and unregisters the callback routines.
+     * After a call to close(), the previously registered callbacks must be
+     * considered invalid by the HAL.
+     * If close() is invoked without a previous setCallback, this function must perform
+     * no work.
+     */
+    close();
+};
diff --git a/gnss/1.0/IGnssNavigationMessageCallback.hal b/gnss/1.0/IGnssNavigationMessageCallback.hal
new file mode 100644
index 0000000..a714fd7
--- /dev/null
+++ b/gnss/1.0/IGnssNavigationMessageCallback.hal
@@ -0,0 +1,166 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+/** Represents a GNSS navigation message (or a fragment of it). */
+interface IGnssNavigationMessageCallback {
+    /*
+     * Enumeration of available values to indicate the GNSS Navigation message
+     * types.
+     *
+     * For convenience, first byte is the GnssConstellationType on which that signal
+     * is typically transmitted.
+     */
+    enum GnssNavigationMessageType : int16_t {
+        TYPE_UNKNOWN    = 0,
+        /** GNSS L1 C/A message contained in the structure.  */
+        GNSS_L1CA       = 0x0101,
+        /** GNSS L2-CNAV message contained in the structure. */
+        GNSS_L2CNAV     = 0x0102,
+        /** GNSS L5-CNAV message contained in the structure. */
+        GNSS_L5CNAV     = 0x0103,
+        /** GNSS CNAV-2 message contained in the structure. */
+        GNSS_CNAV2      = 0x0104,
+        /** Glonass L1 CA message contained in the structure. */
+        GLO_L1CA        = 0x0301,
+        /** Beidou D1 message contained in the structure. */
+        BDS_D1          = 0x0501,
+        /** Beidou D2 message contained in the structure. */
+        BDS_D2          = 0x0502,
+        /** Galileo I/NAV message contained in the structure. */
+        GAL_I           = 0x0601,
+        /** Galileo F/NAV message contained in the structure. */
+        GAL_F           = 0x0602
+    };
+
+    /*
+     * Status of Navigation Message
+     * When a message is received properly without any parity error in its
+     * navigation words, the status must be set to PARITY_PASSED. But if a message is
+     * received with words that failed parity check, but GNSS is able to correct
+     * those words, the status must be set to PARITY_REBUILT.
+     * No need to send any navigation message that contains words with parity error
+     * and cannot be corrected.
+     */
+    enum NavigationMessageStatus : uint16_t {
+        PARITY_PASSED  = (1 << 0),
+        PARITY_REBUILT = (1 << 1),
+        STATUS_UNKOWN  = 0
+    };
+
+    struct GnssNavigationMessage {
+        /*
+         * Satellite vehicle ID number, as defined in GnssSvInfo::svid
+         * This is a mandatory value.
+         */
+        int16_t svid;
+
+        /*
+         * The type of message contained in the structure.
+         * This is a mandatory value.
+         */
+        GnssNavigationMessageType type;
+
+        /*
+         * The status of the received navigation message.
+         * No need to send any navigation message that contains words with parity
+         * error and cannot be corrected.
+         */
+        NavigationMessageStatus status;
+
+        /*
+         * Message identifier. It provides an index so the complete Navigation
+         * Message can be assembled.
+         *
+         * - For GNSS L1 C/A subframe 4 and 5, this value corresponds to the 'frame
+         *   id' of the navigation message, in the range of 1-25 (Subframe 1, 2, 3
+         *   does not contain a 'frame id' and this value can be set to -1.)
+         *
+         * - For Glonass L1 C/A, this refers to the frame ID, in the range of 1-5.
+         *
+         * - For BeiDou D1, this refers to the frame number in the range of 1-24
+         *
+         * - For Beidou D2, this refers to the frame number, in the range of 1-120
+         *
+         * - For Galileo F/NAV nominal frame structure, this refers to the subframe
+         *   number, in the range of 1-12
+         *
+         * - For Galileo I/NAV nominal frame structure, this refers to the subframe
+         *   number in the range of 1-24
+         */
+        int16_t messageId;
+
+        /*
+         * Sub-message identifier. If required by the message 'type', this value
+         * contains a sub-index within the current message (or frame) that is being
+         * transmitted.
+         *
+         * - For GNSS L1 C/A, BeiDou D1 & BeiDou D2, the submessage id corresponds to
+         *   the subframe number of the navigation message, in the range of 1-5.
+         *
+         * - For Glonass L1 C/A, this refers to the String number, in the range from
+         *   1-15
+         *
+         * - For Galileo F/NAV, this refers to the page type in the range 1-6
+         *
+         * - For Galileo I/NAV, this refers to the word type in the range 1-10+
+         */
+        int16_t submessageId;
+
+        /*
+         * The data of the reported GNSS message. The bytes (or words) are specified
+         * using big endian format (MSB first). The data is stored and decoded
+         * in a server for research purposes.
+         *
+         * - For GNSS L1 C/A, Beidou D1 & Beidou D2, each subframe contains 10 30-bit
+         *   words. Each word (30 bits) must fit into the last 30 bits in a
+         *   4-byte word (skip B31 and B32), with MSB first, for a total of 40
+         *   bytes, covering a time period of 6, 6, and 0.6 seconds, respectively.
+         *   The standard followed is 1995 SPS Signal specification.
+         *
+         * - For Glonass L1 C/A, each string contains 85 data bits, including the
+         *   checksum.  These bits must fit into 11 bytes, with MSB first (skip
+         *   B86-B88), covering a time period of 2 seconds.
+         *   The standard followed is Glonass Interface Control Document Edition 5.1.
+         *
+         * - For Galileo F/NAV, each word consists of 238-bit (sync & tail symbols
+         *   excluded). Each word must fit into 30-bytes, with MSB first (skip
+         *   B239, B240), covering a time period of 10 seconds. The standard
+         *   followed is European GNSS(Galileo) Signal in Space Interface
+         *   Control Document Issue 1.2.
+         *
+         * - For Galileo I/NAV, each page contains 2 page parts, even and odd, with
+         *   a total of 2x114 = 228 bits, (sync & tail excluded) that must fit
+         *   into 29 bytes, with MSB first (skip B229-B232). The standard followed
+         *   is same as above.
+         *
+         * TODO(b/32022567): Describe this relationship with data to the VTS
+         * via custom annotations and plug in a VTS test to verify that the data
+         * correctly follows the standard.
+         *
+         */
+        vec<uint8_t> data;
+    };
+
+    /*
+     * The callback to report an available fragment of a GNSS navigation messages
+     * from the HAL.
+     *
+     * @param message - The GNSS navigation submessage/subframe representation.
+     */
+     gnssNavigationMessageCb(GnssNavigationMessage message);
+};
diff --git a/gnss/1.0/IGnssNi.hal b/gnss/1.0/IGnssNi.hal
new file mode 100644
index 0000000..c823bf0
--- /dev/null
+++ b/gnss/1.0/IGnssNi.hal
@@ -0,0 +1,41 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+import IGnssNiCallback;
+
+/*
+ * Extended interface for Network-initiated (NI) support. This interface is used
+ * to respond to NI notifications originating from the HAL.
+ */
+interface IGnssNi {
+    /*
+     * Registers the callbacks for HAL to use.
+     *
+     * @param callback handle to IGnssNiCallback interface.
+     */
+    setCallback(IGnssNiCallback callback);
+
+    /*
+     * Sends a response to HAL.
+     *
+     * @param notifId An ID generated by HAL to associate NI notifications and
+     * framework responses.
+     * @param userResponse A GNSS Ni response indicating if the notification was
+     * accepted, denied or not responded to.
+     */
+    respond(int32_t notifId, GnssUserResponseType userResponse);
+};
diff --git a/gnss/1.0/IGnssNiCallback.hal b/gnss/1.0/IGnssNiCallback.hal
new file mode 100644
index 0000000..c696a92
--- /dev/null
+++ b/gnss/1.0/IGnssNiCallback.hal
@@ -0,0 +1,123 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+/* GNSS Network Initiated callback interface. */
+interface IGnssNiCallback {
+    /*
+     * GnssNiType constants
+     */
+    enum GnssNiType : uint32_t {
+        VOICE           = 1,
+        UMTS_SUPL       = 2,
+        UMTS_CTRL_PLANE = 3
+    };
+
+    /*
+     * GnssNiNotifyFlags constants
+     */
+    enum GnssNiNotifyFlags : uint32_t {
+        /** NI requires notification */
+        NEED_NOTIFY      = 0x0001,
+        /** NI requires verification */
+        NEED_VERIFY      = 0x0002,
+        /** NI requires privacy override, no notification/minimal trace */
+        PRIVACY_OVERRIDE = 0x0004,
+    };
+
+    /*
+     * GNSS NI responses, used to define the response in
+     * NI structures
+     */
+    enum GnssUserResponseType : int32_t {
+        RESPONSE_ACCEPT  = 1,
+        RESPONSE_DENY    = 2,
+        RESPONSE_NORESP  = 3,
+    };
+
+    /*
+     * NI data encoding scheme
+     */
+    enum GnssNiEncodingType : int32_t {
+        ENC_NONE              = 0,
+        ENC_SUPL_GSM_DEFAULT  = 1,
+        ENC_SUPL_UTF8         = 2,
+        ENC_SUPL_UCS2         = 3,
+        ENC_UNKNOWN           = -1,
+    };
+
+    /** Represents an NI request */
+    struct GnssNiNotification{
+        /*
+         * An ID generated by HAL to associate NI notifications and UI
+         * responses.
+         */
+        int32_t notificationId;
+
+        /*
+         * A type used to distinguish different categories of NI
+         * events, such as VOICE, UMTS_SUPL etc.
+         */
+        GnssNiType niType;
+
+        /*
+         * Notification/verification options, combinations of GnssNiNotifyFlags
+         * constants.
+         */
+        GnssNiNotifyFlags notifyFlags;
+
+        /*
+         * Timeout period to wait for user response.
+         * Set to 0 for no timeout limit. Specified in seconds.
+         */
+        uint32_t timeoutSec;
+
+        /*
+         * Default response when timeout.
+         */
+        GnssUserResponseType defaultResponse;
+
+        /*
+         * String representing the requester of the network inititated location
+         * request.
+         */
+        string requestorId;
+
+        /*
+         * Notification message. String representing the service(for eg. SUPL-service)
+         * who sent the network initiated location request.
+         */
+        string notificationMessage;
+
+        /*
+         * requestorId decoding scheme.
+         */
+        GnssNiEncodingType requestorIdEncoding;
+
+        /*
+         * notificationId decoding scheme
+         */
+        GnssNiEncodingType notificationIdEncoding;
+    };
+
+    /*
+     * Callback with a network initiated request.
+     *
+     * @param notification network initiated request.
+     */
+    niNotifyCb(GnssNiNotification notification);
+};
diff --git a/gnss/1.0/IGnssXtra.hal b/gnss/1.0/IGnssXtra.hal
new file mode 100644
index 0000000..5222fde
--- /dev/null
+++ b/gnss/1.0/IGnssXtra.hal
@@ -0,0 +1,27 @@
+package android.hardware.gnss@1.0;
+import IGnssXtraCallback;
+
+/*
+ * This interface is used by the GNSS HAL to request the framework
+ * to download XTRA data.
+ */
+interface IGnssXtra {
+    /*
+     * Opens the XTRA interface and provides the callback routines
+     * to the implementation of this interface.
+     *
+     * @param callback Handle to the IGnssXtraCallback interface.
+     *
+     * @return success True if the operation is successful.
+     */
+    setCallback(IGnssXtraCallback callback) generates (bool success);
+
+    /*
+     * Inject the downloaded XTRA data into the GNSS receiver.
+     *
+     * @param xtraData GNSS XTRA data.
+     *
+     * @return success True if the operation is successful.
+     */
+    injectXtraData(string xtraData) generates (bool success);
+};
diff --git a/gnss/1.0/IGnssXtraCallback.hal b/gnss/1.0/IGnssXtraCallback.hal
new file mode 100644
index 0000000..42df082
--- /dev/null
+++ b/gnss/1.0/IGnssXtraCallback.hal
@@ -0,0 +1,12 @@
+package android.hardware.gnss@1.0;
+
+/*
+ * This interface is used by the GNSS HAL to request download of XTRA data.
+ */
+interface IGnssXtraCallback {
+   /*
+    * Callback to request the client to download XTRA data. The client should
+    * download XTRA data and inject it by calling injectXtraData().
+    */
+   downloadRequestCb();
+};
diff --git a/gnss/1.0/types.hal b/gnss/1.0/types.hal
new file mode 100644
index 0000000..3120648
--- /dev/null
+++ b/gnss/1.0/types.hal
@@ -0,0 +1,71 @@
+/*
+ * 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.
+ */
+
+package android.hardware.gnss@1.0;
+
+enum ConstS32 : int32_t {
+/** Maximum number of SVs for gnssSvStatusCb(). */
+    GNSS_MAX_SVS = 64,
+
+/* Maximum number of Measurements in gnssMeasurementCb(). */
+    GNSS_MAX_MEASUREMENT = 64,
+};
+
+/* Milliseconds since January 1, 1970 */
+typedef int64_t GnssUtcTime;
+
+/*
+ * Constellation type of GnssSvInfo
+ */
+enum GnssConstellationType : uint8_t {
+    UNKNOWN = 0,
+    GNSS     = 1,
+    SBAS    = 2,
+    GLONASS = 3,
+    QZSS    = 4,
+    BEIDOU  = 5,
+    GALILEO = 6,
+};
+
+/* Represents a location. */
+struct GnssLocation {
+    /* Contains GnssLocationFlags bits. */
+    uint16_t gnssLocationFlags;
+
+    /* Represents latitude in degrees. */
+    double latitude;
+
+    /* Represents longitude in degrees. */
+    double longitude;
+
+    /*
+     * Represents altitude in meters above the WGS 84 reference ellipsoid.
+     */
+    double altitude;
+
+    /* Represents speed in meters per second. */
+    float speedMetersperSec;
+
+    /* Represents heading in degrees. */
+    float bearingDegrees;
+
+    /* Represents expected accuracy in meters. */
+    float accuracyMeters;
+
+    /* Timestamp for the location fix. */
+    GnssUtcTime timestamp;
+
+};