diff --git a/biometrics/face/aidl/Android.bp b/biometrics/face/aidl/Android.bp
index 6c8cd78..efd114a 100644
--- a/biometrics/face/aidl/Android.bp
+++ b/biometrics/face/aidl/Android.bp
@@ -60,8 +60,16 @@
                 "android.hardware.keymaster-V4",
             ],
         },
+        {
+            version: "4",
+            imports: [
+                "android.hardware.biometrics.common-V3",
+                "android.hardware.common-V2",
+                "android.hardware.keymaster-V4",
+            ],
+        },
 
     ],
-    frozen: false,
+    frozen: true,
 
 }
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/.hash b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/.hash
new file mode 100644
index 0000000..dda89e4
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/.hash
@@ -0,0 +1 @@
+33be703fa4cde5f04f976fa3f29d15fa4f3e70c5
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/AcquiredInfo.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/AcquiredInfo.aidl
new file mode 100644
index 0000000..5312ca1
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/AcquiredInfo.aidl
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@Backing(type="byte") @VintfStability
+enum AcquiredInfo {
+  UNKNOWN,
+  GOOD,
+  INSUFFICIENT,
+  TOO_BRIGHT,
+  TOO_DARK,
+  TOO_CLOSE,
+  TOO_FAR,
+  FACE_TOO_HIGH,
+  FACE_TOO_LOW,
+  FACE_TOO_RIGHT,
+  FACE_TOO_LEFT,
+  POOR_GAZE,
+  NOT_DETECTED,
+  TOO_MUCH_MOTION,
+  RECALIBRATE,
+  TOO_DIFFERENT,
+  TOO_SIMILAR,
+  PAN_TOO_EXTREME,
+  TILT_TOO_EXTREME,
+  ROLL_TOO_EXTREME,
+  FACE_OBSCURED,
+  START,
+  SENSOR_DIRTY,
+  VENDOR,
+  FIRST_FRAME_RECEIVED,
+  DARK_GLASSES_DETECTED,
+  MOUTH_COVERING_DETECTED,
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/AuthenticationFrame.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/AuthenticationFrame.aidl
new file mode 100644
index 0000000..20bc767
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/AuthenticationFrame.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+parcelable AuthenticationFrame {
+  android.hardware.biometrics.face.BaseFrame data;
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/BaseFrame.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/BaseFrame.aidl
new file mode 100644
index 0000000..67b5cf4
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/BaseFrame.aidl
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+parcelable BaseFrame {
+  android.hardware.biometrics.face.AcquiredInfo acquiredInfo = android.hardware.biometrics.face.AcquiredInfo.UNKNOWN;
+  int vendorCode;
+  float pan;
+  float tilt;
+  float distance;
+  boolean isCancellable;
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Cell.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Cell.aidl
new file mode 100644
index 0000000..6be8c8e
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Cell.aidl
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+parcelable Cell {
+  int x;
+  int y;
+  int z;
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentFrame.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentFrame.aidl
new file mode 100644
index 0000000..0ea10d6
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentFrame.aidl
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+parcelable EnrollmentFrame {
+  @nullable android.hardware.biometrics.face.Cell cell;
+  android.hardware.biometrics.face.EnrollmentStage stage = android.hardware.biometrics.face.EnrollmentStage.UNKNOWN;
+  android.hardware.biometrics.face.BaseFrame data;
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentStage.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentStage.aidl
new file mode 100644
index 0000000..a203dbe
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentStage.aidl
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@Backing(type="byte") @VintfStability
+enum EnrollmentStage {
+  UNKNOWN,
+  FIRST_FRAME_RECEIVED,
+  WAITING_FOR_CENTERING,
+  HOLD_STILL_IN_CENTER,
+  ENROLLING_MOVEMENT_1,
+  ENROLLING_MOVEMENT_2,
+  ENROLLMENT_FINISHED,
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentStageConfig.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentStageConfig.aidl
new file mode 100644
index 0000000..48db2cf
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentStageConfig.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+parcelable EnrollmentStageConfig {
+  android.hardware.biometrics.face.EnrollmentStage stage = android.hardware.biometrics.face.EnrollmentStage.UNKNOWN;
+  List<android.hardware.biometrics.face.Cell> cells;
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentType.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentType.aidl
new file mode 100644
index 0000000..da1e8a3
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/EnrollmentType.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@Backing(type="byte") @VintfStability
+enum EnrollmentType {
+  DEFAULT,
+  ACCESSIBILITY,
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Error.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Error.aidl
new file mode 100644
index 0000000..28eb420
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Error.aidl
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@Backing(type="byte") @VintfStability
+enum Error {
+  UNKNOWN,
+  HW_UNAVAILABLE,
+  UNABLE_TO_PROCESS,
+  TIMEOUT,
+  NO_SPACE,
+  CANCELED,
+  UNABLE_TO_REMOVE,
+  VENDOR,
+  REENROLL_REQUIRED,
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/FaceEnrollOptions.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/FaceEnrollOptions.aidl
new file mode 100644
index 0000000..23fa147
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/FaceEnrollOptions.aidl
@@ -0,0 +1,46 @@
+/*
+ * 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.biometrics.face;
+@VintfStability
+parcelable FaceEnrollOptions {
+  android.hardware.keymaster.HardwareAuthToken hardwareAuthToken;
+  android.hardware.biometrics.face.EnrollmentType enrollmentType;
+  android.hardware.biometrics.face.Feature[] features;
+  /**
+   * @deprecated use {@link surfacePreview} instead {@link NativeHandle} a handle used to render content from the face HAL. Note that only one of [{@link surfacePreview}, {@link nativeHandlePreview}] should be set at one time.
+   */
+  @nullable android.hardware.common.NativeHandle nativeHandlePreview;
+  @nullable android.view.Surface surfacePreview;
+  @nullable android.hardware.biometrics.common.OperationContext context;
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/FaceSensorType.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/FaceSensorType.aidl
new file mode 100644
index 0000000..bf1677c
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/FaceSensorType.aidl
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@Backing(type="byte") @VintfStability
+enum FaceSensorType {
+  UNKNOWN,
+  RGB,
+  IR,
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Feature.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Feature.aidl
new file mode 100644
index 0000000..924e6af
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/Feature.aidl
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@Backing(type="byte") @VintfStability
+enum Feature {
+  REQUIRE_ATTENTION,
+  REQUIRE_DIVERSE_POSES,
+  DEBUG,
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/IFace.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/IFace.aidl
new file mode 100644
index 0000000..fc4a4d0
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/IFace.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+interface IFace {
+  android.hardware.biometrics.face.SensorProps[] getSensorProps();
+  android.hardware.biometrics.face.ISession createSession(in int sensorId, in int userId, in android.hardware.biometrics.face.ISessionCallback cb);
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/ISession.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/ISession.aidl
new file mode 100644
index 0000000..4d99f5a
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/ISession.aidl
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+interface ISession {
+  void generateChallenge();
+  void revokeChallenge(in long challenge);
+  android.hardware.biometrics.face.EnrollmentStageConfig[] getEnrollmentConfig(in android.hardware.biometrics.face.EnrollmentType enrollmentType);
+  /**
+   * @deprecated use {@link enrollWithOptions} instead.
+   */
+  android.hardware.biometrics.common.ICancellationSignal enroll(in android.hardware.keymaster.HardwareAuthToken hat, in android.hardware.biometrics.face.EnrollmentType type, in android.hardware.biometrics.face.Feature[] features, in @nullable android.hardware.common.NativeHandle previewSurface);
+  android.hardware.biometrics.common.ICancellationSignal authenticate(in long operationId);
+  android.hardware.biometrics.common.ICancellationSignal detectInteraction();
+  void enumerateEnrollments();
+  void removeEnrollments(in int[] enrollmentIds);
+  void getFeatures();
+  void setFeature(in android.hardware.keymaster.HardwareAuthToken hat, in android.hardware.biometrics.face.Feature feature, boolean enabled);
+  void getAuthenticatorId();
+  void invalidateAuthenticatorId();
+  void resetLockout(in android.hardware.keymaster.HardwareAuthToken hat);
+  void close();
+  android.hardware.biometrics.common.ICancellationSignal authenticateWithContext(in long operationId, in android.hardware.biometrics.common.OperationContext context);
+  /**
+   * @deprecated use {@link enrollWithOptions} instead.
+   */
+  android.hardware.biometrics.common.ICancellationSignal enrollWithContext(in android.hardware.keymaster.HardwareAuthToken hat, in android.hardware.biometrics.face.EnrollmentType type, in android.hardware.biometrics.face.Feature[] features, in @nullable android.hardware.common.NativeHandle previewSurface, in android.hardware.biometrics.common.OperationContext context);
+  android.hardware.biometrics.common.ICancellationSignal detectInteractionWithContext(in android.hardware.biometrics.common.OperationContext context);
+  void onContextChanged(in android.hardware.biometrics.common.OperationContext context);
+  android.hardware.biometrics.common.ICancellationSignal enrollWithOptions(in android.hardware.biometrics.face.FaceEnrollOptions options);
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/ISessionCallback.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/ISessionCallback.aidl
new file mode 100644
index 0000000..bbace29
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/ISessionCallback.aidl
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+interface ISessionCallback {
+  void onChallengeGenerated(in long challenge);
+  void onChallengeRevoked(in long challenge);
+  void onAuthenticationFrame(in android.hardware.biometrics.face.AuthenticationFrame frame);
+  void onEnrollmentFrame(in android.hardware.biometrics.face.EnrollmentFrame frame);
+  void onError(in android.hardware.biometrics.face.Error error, in int vendorCode);
+  void onEnrollmentProgress(in int enrollmentId, int remaining);
+  void onAuthenticationSucceeded(in int enrollmentId, in android.hardware.keymaster.HardwareAuthToken hat);
+  void onAuthenticationFailed();
+  void onLockoutTimed(in long durationMillis);
+  void onLockoutPermanent();
+  void onLockoutCleared();
+  void onInteractionDetected();
+  void onEnrollmentsEnumerated(in int[] enrollmentIds);
+  void onFeaturesRetrieved(in android.hardware.biometrics.face.Feature[] features);
+  void onFeatureSet(android.hardware.biometrics.face.Feature feature);
+  void onEnrollmentsRemoved(in int[] enrollmentIds);
+  void onAuthenticatorIdRetrieved(in long authenticatorId);
+  void onAuthenticatorIdInvalidated(in long newAuthenticatorId);
+  void onSessionClosed();
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/SensorProps.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/SensorProps.aidl
new file mode 100644
index 0000000..8b3c51b
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/4/android/hardware/biometrics/face/SensorProps.aidl
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2021 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.biometrics.face;
+@VintfStability
+parcelable SensorProps {
+  android.hardware.biometrics.common.CommonProps commonProps;
+  android.hardware.biometrics.face.FaceSensorType sensorType = android.hardware.biometrics.face.FaceSensorType.UNKNOWN;
+  boolean halControlsPreview;
+  int previewDisplayId;
+  int enrollPreviewWidth;
+  int enrollPreviewHeight;
+  float enrollTranslationX;
+  float enrollTranslationY;
+  float enrollPreviewScale;
+  boolean supportsDetectInteraction;
+}
diff --git a/compatibility_matrices/compatibility_matrix.8.xml b/compatibility_matrices/compatibility_matrix.8.xml
index 9057788..777eb84 100644
--- a/compatibility_matrices/compatibility_matrix.8.xml
+++ b/compatibility_matrices/compatibility_matrix.8.xml
@@ -116,7 +116,7 @@
     </hal>
     <hal format="aidl" optional="true" updatable-via-apex="true">
         <name>android.hardware.biometrics.face</name>
-        <version>3</version>
+        <version>3-4</version>
         <interface>
             <name>IFace</name>
             <instance>default</instance>