Added EMERGENCY_LANE_KEEP_ASSIST_STATE to HAL layer.

Bug: 264946353
Test: atest VtsHalAutomotiveVehicle_TargetTest
Change-Id: I16a046e0eed02ba79bf7ed6212e9063b91b9f43a
diff --git a/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h b/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h
index bbe1fca..53ea656 100644
--- a/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h
+++ b/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h
@@ -258,6 +258,7 @@
         {VehicleProperty::LANE_CENTERING_ASSIST_COMMAND, VehiclePropertyAccess::WRITE},
         {VehicleProperty::LANE_CENTERING_ASSIST_STATE, VehiclePropertyAccess::READ},
         {VehicleProperty::EMERGENCY_LANE_KEEP_ASSIST_ENABLED, VehiclePropertyAccess::READ_WRITE},
+        {VehicleProperty::EMERGENCY_LANE_KEEP_ASSIST_STATE, VehiclePropertyAccess::READ},
         {VehicleProperty::CRUISE_CONTROL_ENABLED, VehiclePropertyAccess::READ_WRITE},
         {VehicleProperty::HANDS_ON_DETECTION_ENABLED, VehiclePropertyAccess::READ_WRITE},
         {VehicleProperty::DRIVER_ATTENTION_MONITORING_ENABLED, VehiclePropertyAccess::READ_WRITE},
diff --git a/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h b/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h
index 2a005a8..a4bedf9 100644
--- a/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h
+++ b/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h
@@ -258,6 +258,7 @@
         {VehicleProperty::LANE_CENTERING_ASSIST_COMMAND, VehiclePropertyChangeMode::ON_CHANGE},
         {VehicleProperty::LANE_CENTERING_ASSIST_STATE, VehiclePropertyChangeMode::ON_CHANGE},
         {VehicleProperty::EMERGENCY_LANE_KEEP_ASSIST_ENABLED, VehiclePropertyChangeMode::ON_CHANGE},
+        {VehicleProperty::EMERGENCY_LANE_KEEP_ASSIST_STATE, VehiclePropertyChangeMode::ON_CHANGE},
         {VehicleProperty::CRUISE_CONTROL_ENABLED, VehiclePropertyChangeMode::ON_CHANGE},
         {VehicleProperty::HANDS_ON_DETECTION_ENABLED, VehiclePropertyChangeMode::ON_CHANGE},
         {VehicleProperty::DRIVER_ATTENTION_MONITORING_ENABLED, VehiclePropertyChangeMode::ON_CHANGE},
diff --git a/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java b/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java
index 466ca5d..f0a2440 100644
--- a/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java
+++ b/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java
@@ -250,6 +250,7 @@
         Map.entry(VehicleProperty.LANE_CENTERING_ASSIST_COMMAND, VehiclePropertyAccess.WRITE),
         Map.entry(VehicleProperty.LANE_CENTERING_ASSIST_STATE, VehiclePropertyAccess.READ),
         Map.entry(VehicleProperty.EMERGENCY_LANE_KEEP_ASSIST_ENABLED, VehiclePropertyAccess.READ_WRITE),
+        Map.entry(VehicleProperty.EMERGENCY_LANE_KEEP_ASSIST_STATE, VehiclePropertyAccess.READ),
         Map.entry(VehicleProperty.CRUISE_CONTROL_ENABLED, VehiclePropertyAccess.READ_WRITE),
         Map.entry(VehicleProperty.HANDS_ON_DETECTION_ENABLED, VehiclePropertyAccess.READ_WRITE),
         Map.entry(VehicleProperty.DRIVER_ATTENTION_MONITORING_ENABLED, VehiclePropertyAccess.READ_WRITE)
diff --git a/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java b/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java
index c7b5e26..c642597 100644
--- a/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java
+++ b/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java
@@ -250,6 +250,7 @@
         Map.entry(VehicleProperty.LANE_CENTERING_ASSIST_COMMAND, VehiclePropertyChangeMode.ON_CHANGE),
         Map.entry(VehicleProperty.LANE_CENTERING_ASSIST_STATE, VehiclePropertyChangeMode.ON_CHANGE),
         Map.entry(VehicleProperty.EMERGENCY_LANE_KEEP_ASSIST_ENABLED, VehiclePropertyChangeMode.ON_CHANGE),
+        Map.entry(VehicleProperty.EMERGENCY_LANE_KEEP_ASSIST_STATE, VehiclePropertyChangeMode.ON_CHANGE),
         Map.entry(VehicleProperty.CRUISE_CONTROL_ENABLED, VehiclePropertyChangeMode.ON_CHANGE),
         Map.entry(VehicleProperty.HANDS_ON_DETECTION_ENABLED, VehiclePropertyChangeMode.ON_CHANGE),
         Map.entry(VehicleProperty.DRIVER_ATTENTION_MONITORING_ENABLED, VehiclePropertyChangeMode.ON_CHANGE)
diff --git a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
index 0111c6b..1f9c3c1 100644
--- a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
+++ b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
@@ -38,6 +38,7 @@
 using ::aidl::android::hardware::automotive::vehicle::AutomaticEmergencyBrakingState;
 using ::aidl::android::hardware::automotive::vehicle::BlindSpotWarningState;
 using ::aidl::android::hardware::automotive::vehicle::ChangeModeForVehicleProperty;
+using ::aidl::android::hardware::automotive::vehicle::EmergencyLaneKeepAssistState;
 using ::aidl::android::hardware::automotive::vehicle::ErrorState;
 using ::aidl::android::hardware::automotive::vehicle::EvConnectorType;
 using ::aidl::android::hardware::automotive::vehicle::EvsServiceState;
@@ -218,6 +219,8 @@
     mConstantParsersByType["FuelType"] = std::make_unique<ConstantParser<FuelType>>();
     mConstantParsersByType["WindshieldWipersState"] =
             std::make_unique<ConstantParser<WindshieldWipersState>>();
+    mConstantParsersByType["EmergencyLaneKeepAssistState"] =
+            std::make_unique<ConstantParser<EmergencyLaneKeepAssistState>>();
     mConstantParsersByType["ErrorState"] = std::make_unique<ConstantParser<ErrorState>>();
     mConstantParsersByType["AutomaticEmergencyBrakingState"] =
             std::make_unique<ConstantParser<AutomaticEmergencyBrakingState>>();
diff --git a/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json b/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
index 810f48b..889eef8 100644
--- a/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
+++ b/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
@@ -3113,6 +3113,31 @@
             }
         },
         {
+            "property": "VehicleProperty::EMERGENCY_LANE_KEEP_ASSIST_STATE",
+            "defaultValue": {
+                "int32Values": [
+                    "EmergencyLaneKeepAssistState::ENABLED"
+                ]
+            },
+            "areas": [
+                {
+                    "areaId": 0,
+                    "supportedEnumValues": [
+                        "ErrorState::NOT_AVAILABLE_SAFETY",
+                        "ErrorState::NOT_AVAILABLE_SPEED_HIGH",
+                        "ErrorState::NOT_AVAILABLE_SPEED_LOW",
+                        "ErrorState::NOT_AVAILABLE_DISABLED",
+                        "EmergencyLaneKeepAssistState::ENABLED",
+                        "EmergencyLaneKeepAssistState::WARNING_LEFT",
+                        "EmergencyLaneKeepAssistState::WARNING_RIGHT",
+                        "EmergencyLaneKeepAssistState::ACTIVATED_STEER_LEFT",
+                        "EmergencyLaneKeepAssistState::ACTIVATED_STEER_RIGHT",
+                        "EmergencyLaneKeepAssistState::USER_OVERRIDE"
+                    ]
+                }
+            ]
+        },
+        {
             "property": "VehicleProperty::CRUISE_CONTROL_ENABLED",
             "defaultValue": {
                 "int32Values": [
diff --git a/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h b/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h
index a7a1dc7..3c12a47 100644
--- a/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h
+++ b/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h
@@ -21,6 +21,7 @@
 #include <aidl/android/hardware/automotive/vehicle/BlindSpotWarningState.h>
 #include <aidl/android/hardware/automotive/vehicle/DiagnosticFloatSensorIndex.h>
 #include <aidl/android/hardware/automotive/vehicle/DiagnosticIntegerSensorIndex.h>
+#include <aidl/android/hardware/automotive/vehicle/EmergencyLaneKeepAssistState.h>
 #include <aidl/android/hardware/automotive/vehicle/ErrorState.h>
 #include <aidl/android/hardware/automotive/vehicle/EvConnectorType.h>
 #include <aidl/android/hardware/automotive/vehicle/EvStoppingMode.h>
diff --git a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/EmergencyLaneKeepAssistState.aidl b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/EmergencyLaneKeepAssistState.aidl
new file mode 100644
index 0000000..078acde1
--- /dev/null
+++ b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/EmergencyLaneKeepAssistState.aidl
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.automotive.vehicle;
+@Backing(type="int") @VintfStability
+enum EmergencyLaneKeepAssistState {
+  OTHER = 0,
+  ENABLED = 1,
+  WARNING_LEFT = 2,
+  WARNING_RIGHT = 3,
+  ACTIVATED_STEER_LEFT = 4,
+  ACTIVATED_STEER_RIGHT = 5,
+  USER_OVERRIDE = 6,
+}
diff --git a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl
index e89197b..6e17bca 100644
--- a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -256,6 +256,7 @@
   LANE_CENTERING_ASSIST_COMMAND = (((0x100B + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.INT32) /* 289411083 */,
   LANE_CENTERING_ASSIST_STATE = (((0x100C + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.INT32) /* 289411084 */,
   EMERGENCY_LANE_KEEP_ASSIST_ENABLED = (((0x100D + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.BOOLEAN) /* 287313933 */,
+  EMERGENCY_LANE_KEEP_ASSIST_STATE = (((0x100E + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.INT32) /* 289411086 */,
   CRUISE_CONTROL_ENABLED = (((0x100F + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.BOOLEAN) /* 287313935 */,
   HANDS_ON_DETECTION_ENABLED = (((0x1016 + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.BOOLEAN) /* 287313942 */,
   DRIVER_ATTENTION_MONITORING_ENABLED = (((0x1019 + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.BOOLEAN) /* 287313945 */,
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/EmergencyLaneKeepAssistState.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/EmergencyLaneKeepAssistState.aidl
new file mode 100644
index 0000000..302b9af
--- /dev/null
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/EmergencyLaneKeepAssistState.aidl
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2023 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.automotive.vehicle;
+
+/**
+ * Used by emergency lane keep assist to enumerate state.
+ *
+ * This enum could be extended in future releases to include additional feature states.
+ */
+@VintfStability
+@Backing(type="int")
+enum EmergencyLaneKeepAssistState {
+    /**
+     * This state is used as an alternative for any EmergencyLaneKeepAssistState value that is not
+     * defined in the platform. Ideally, implementations of
+     * VehicleProperty#EMERGENCY_LANE_KEEP_ASSIST_STATE should not use this state. The framework can
+     * use this field to remain backwards compatible if EmergencyLaneKeepAssistState is extended to
+     * include additional states.
+     */
+    OTHER = 0,
+    /**
+     * ELKA is enabled and monitoring safety, but no safety event is detected and steering assist is
+     * not activated.
+     */
+    ENABLED = 1,
+    /**
+     * ELKA is enabled and a safety event is detected. Vehicle is sending out a warning to the
+     * driver indicating that there is a dangerous maneuver on the left side of the vehicle.
+     */
+    WARNING_LEFT = 2,
+    /**
+     * ELKA is enabled and a safety event is detected. Vehicle is sending out a warning to the
+     * driver indicating that there is a dangerous maneuver on the right side of the vehicle.
+     */
+    WARNING_RIGHT = 3,
+    /**
+     * ELKA is enabled and currently has steering assist applied to the vehicle. Steering assist
+     * nudges the vehicle towards the left, which generally means the steering wheel turns counter
+     * clockwise. This is usually in response to the driver making an unsafe right lane change.
+     */
+    ACTIVATED_STEER_LEFT = 4,
+    /**
+     * ELKA is enabled and currently has steering assist applied to the vehicle. Steering assist
+     * nudges the vehicle towards the right, which generally means the steering wheel turns
+     * clockwise. This is usually in response to the driver making an unsafe left lane change.
+     */
+    ACTIVATED_STEER_RIGHT = 5,
+    /**
+     * Many safety feature implementations allow the driver to override said feature. This means
+     * that the car has determined it should take some action, but a user decides to take over and
+     * do something else. This is often done for safety reasons and to ensure that the driver can
+     * always take control of the vehicle. This state should be set when the user is currently
+     * overriding ELKA.
+     */
+    USER_OVERRIDE = 6,
+}
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
index d8d5959..8c6e930 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -3833,6 +3833,26 @@
             0x100D + VehiclePropertyGroup.SYSTEM + VehicleArea.GLOBAL + VehiclePropertyType.BOOLEAN,
 
     /**
+     * Emergency Lane Keep Assist (ELKA) state.
+     *
+     * Returns the current state of ELKA. Generally, this property should return a valid state
+     * defined in the EmergencyLaneKeepAssistState or ErrorState. For example, if the feature is not
+     * available due to some temporary state, that information should be conveyed through
+     * ErrorState.
+     *
+     * For the global area ID (0), the VehicleAreaConfig#supportedEnumValues array must be defined
+     * unless all states of EmergencyLaneKeepAssistState (including OTHER, which is not recommended)
+     * and ErrorState are supported.
+     *
+     * @change_mode VehiclePropertyChangeMode.ON_CHANGE
+     * @access VehiclePropertyAccess.READ
+     * @data_enum EmergencyLaneKeepAssistState
+     * @data_enum ErrorState
+     */
+    EMERGENCY_LANE_KEEP_ASSIST_STATE =
+            0x100E + VehiclePropertyGroup.SYSTEM + VehicleArea.GLOBAL + VehiclePropertyType.INT32,
+
+    /**
      * Enable or disable cruise control (CC).
      *
      * Set true to enable CC and false to disable CC. This property is shared by all forms of
diff --git a/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp b/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp
index e3f5dca..b301887 100644
--- a/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp
+++ b/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp
@@ -504,6 +504,12 @@
                    VehiclePropertyGroup::SYSTEM, VehicleArea::GLOBAL, VehiclePropertyType::BOOLEAN);
 }
 
+TEST_P(VtsHalAutomotiveVehicleTargetTest, verifyEmergencyLaneKeepAssistStateConfig) {
+    verifyProperty(VehicleProperty::EMERGENCY_LANE_KEEP_ASSIST_STATE, VehiclePropertyAccess::READ,
+                   VehiclePropertyChangeMode::ON_CHANGE, VehiclePropertyGroup::SYSTEM,
+                   VehicleArea::GLOBAL, VehiclePropertyType::INT32);
+}
+
 TEST_P(VtsHalAutomotiveVehicleTargetTest, verifyCruiseControlEnabledConfig) {
     verifyProperty(VehicleProperty::CRUISE_CONTROL_ENABLED, VehiclePropertyAccess::READ_WRITE,
                    VehiclePropertyChangeMode::ON_CHANGE, VehiclePropertyGroup::SYSTEM,