diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AcquiredInfo.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AcquiredInfo.aidl
index 56d097d..8fd6c5f 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AcquiredInfo.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AcquiredInfo.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AuthenticationFrame.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AuthenticationFrame.aidl
index 3043000..a9e4de3 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AuthenticationFrame.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/AuthenticationFrame.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/BaseFrame.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/BaseFrame.aidl
index 27821e3..a935101 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/BaseFrame.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/BaseFrame.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Cell.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Cell.aidl
index 17c1ba3..cc2bf53 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Cell.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Cell.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentFrame.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentFrame.aidl
index c736e7e..cc78e6b 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentFrame.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentFrame.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStage.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStage.aidl
index af6be90..fefac68 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStage.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStage.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStageConfig.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStageConfig.aidl
index 268ce52..d13eccd 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStageConfig.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentStageConfig.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentType.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentType.aidl
index 7295b3b..3603c4e 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentType.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/EnrollmentType.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Error.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Error.aidl
index cba6ec5..6bbe787 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Error.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Error.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/FaceSensorType.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/FaceSensorType.aidl
index b08c345..481b678 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/FaceSensorType.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/FaceSensorType.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Feature.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Feature.aidl
new file mode 100644
index 0000000..d9e561d
--- /dev/null
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/Feature.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 Feature {
+  WAVE_ATTENTION_REQUIREMENT = 0,
+  WAVE_DIVERSE_POSES_REQUIREMENT = 1,
+  DEBUG = 2,
+}
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/IFace.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/IFace.aidl
index 65afaa4..37345ec 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/IFace.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/IFace.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISession.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISession.aidl
index 203e275..b855a9e 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISession.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISession.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -21,11 +35,13 @@
 interface ISession {
   void generateChallenge(in int cookie, in int timeoutSec);
   void revokeChallenge(in int cookie, in long challenge);
-  android.hardware.biometrics.common.ICancellationSignal enroll(in int cookie, in android.hardware.biometrics.face.EnrollmentType enrollmentType, in android.hardware.keymaster.HardwareAuthToken hat, in android.hardware.common.NativeHandle previewSurface);
+  android.hardware.biometrics.common.ICancellationSignal enroll(in int cookie, in android.hardware.keymaster.HardwareAuthToken hat, in android.hardware.biometrics.face.EnrollmentType type, in android.hardware.biometrics.face.Feature[] features, in android.hardware.common.NativeHandle previewSurface);
   android.hardware.biometrics.common.ICancellationSignal authenticate(in int cookie, in long operationId);
   android.hardware.biometrics.common.ICancellationSignal detectInteraction(in int cookie);
   void enumerateEnrollments(in int cookie);
   void removeEnrollments(in int cookie, in int[] enrollmentIds);
+  void getFeatures(in int cookie, in int enrollmentId);
+  void setFeature(in int cookie, in android.hardware.keymaster.HardwareAuthToken hat, in int enrollmentId, in android.hardware.biometrics.face.Feature feature, boolean enabled);
   void getAuthenticatorId(in int cookie);
   void invalidateAuthenticatorId(in int cookie);
   void resetLockout(in int cookie, in android.hardware.keymaster.HardwareAuthToken hat);
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl
index a81c79a..6127c7b 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/ISessionCallback.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -33,6 +47,8 @@
   void onLockoutCleared();
   void onInteractionDetected();
   void onEnrollmentsEnumerated(in int[] enrollmentIds);
+  void onFeaturesRetrieved(in android.hardware.biometrics.face.Feature[] features, in int enrollmentId);
+  void onFeatureSet(in int enrollmentId, android.hardware.biometrics.face.Feature feature);
   void onEnrollmentsRemoved(in int[] enrollmentIds);
   void onAuthenticatorIdRetrieved(in long authenticatorId);
   void onAuthenticatorIdInvalidated(in long newAuthenticatorId);
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SensorProps.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SensorProps.aidl
index a52829c..9147bc1 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SensorProps.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SensorProps.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SessionState.aidl b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SessionState.aidl
index 12a5eab..46751d0 100644
--- a/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SessionState.aidl
+++ b/biometrics/face/aidl/aidl_api/android.hardware.biometrics.face/current/android/hardware/biometrics/face/SessionState.aidl
@@ -1,4 +1,18 @@
-///////////////////////////////////////////////////////////////////////////////
+/*
+ * 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.                          //
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -28,7 +42,9 @@
   DETECTING_INTERACTION = 6,
   ENUMERATING_ENROLLMENTS = 7,
   REMOVING_ENROLLMENTS = 8,
-  GETTING_AUTHENTICATOR_ID = 9,
-  INVALIDATING_AUTHENTICATOR_ID = 10,
-  RESETTING_LOCKOUT = 11,
+  GETTING_FEATURES = 9,
+  SETTING_FEATURE = 10,
+  GETTING_AUTHENTICATOR_ID = 11,
+  INVALIDATING_AUTHENTICATOR_ID = 12,
+  RESETTING_LOCKOUT = 13,
 }
diff --git a/biometrics/face/aidl/android/hardware/biometrics/face/Error.aidl b/biometrics/face/aidl/android/hardware/biometrics/face/Error.aidl
index d88370f..7230128 100644
--- a/biometrics/face/aidl/android/hardware/biometrics/face/Error.aidl
+++ b/biometrics/face/aidl/android/hardware/biometrics/face/Error.aidl
@@ -32,9 +32,8 @@
     HW_UNAVAILABLE = 1,
 
     /**
-     * The current enroll or authenticate operation could not be completed,
-     * e.g. the sensor was unable to process the current image or the HAT was
-     * invalid.
+     * The current operation could not be completed, e.g. the sensor was unable
+     * to process the current image or the HAT was invalid.
      */
     UNABLE_TO_PROCESS = 2,
 
diff --git a/biometrics/face/aidl/android/hardware/biometrics/face/Feature.aidl b/biometrics/face/aidl/android/hardware/biometrics/face/Feature.aidl
new file mode 100644
index 0000000..b88050a
--- /dev/null
+++ b/biometrics/face/aidl/android/hardware/biometrics/face/Feature.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.
+ */
+
+package android.hardware.biometrics.face;
+
+@VintfStability
+@Backing(type="byte")
+enum Feature {
+    /**
+     * Do not require the user to look at the device during enrollment and authentication. Note
+     * this is to accommodate people who have limited vision.
+     */
+    WAVE_ATTENTION_REQUIREMENT,
+
+    /**
+     * Do not require a diverse set of poses during enrollment. This is to accommodate people with
+     * limited mobility.
+     */
+    WAVE_DIVERSE_POSES_REQUIREMENT,
+
+    /**
+     * Enable debugging functionality.
+     */
+    DEBUG,
+}
+
diff --git a/biometrics/face/aidl/android/hardware/biometrics/face/ISession.aidl b/biometrics/face/aidl/android/hardware/biometrics/face/ISession.aidl
index 34a1f8b..25ddd82 100644
--- a/biometrics/face/aidl/android/hardware/biometrics/face/ISession.aidl
+++ b/biometrics/face/aidl/android/hardware/biometrics/face/ISession.aidl
@@ -17,12 +17,12 @@
 package android.hardware.biometrics.face;
 
 import android.hardware.biometrics.common.ICancellationSignal;
+import android.hardware.biometrics.face.Feature;
 import android.hardware.biometrics.face.EnrollmentType;
 import android.hardware.keymaster.HardwareAuthToken;
 import android.hardware.common.NativeHandle;
 
-/**
- * A session is a collection of immutable state (sensorId, userId), mutable state (SessionState),
+/** * A session is a collection of immutable state (sensorId, userId), mutable state (SessionState),
  * methods available for the framework to call, and a callback (ISessionCallback) to notify the
  * framework about the events and results. A session is used to establish communication between
  * the framework and the HAL.
@@ -131,16 +131,17 @@
      *
      * @param cookie An identifier used to track subsystem operations related to this call path. The
      *               client must guarantee that it is unique per ISession.
+     * @param hat See above documentation.
      * @param enrollmentType See the EnrollmentType enum.
+     * @param features See the Feature enum.
      * @param previewSurface A surface provided by the framework if SensorProps#halControlsPreview is
      *                       set to true. The HAL must send the preview frames to previewSurface if
      *                       it's not null.
-     * @param hat See above documentation.
      * @return ICancellationSignal An object that can be used by the framework to cancel this
      * operation.
      */
-    ICancellationSignal enroll(in int cookie, in EnrollmentType enrollmentType,
-            in HardwareAuthToken hat, in NativeHandle previewSurface);
+    ICancellationSignal enroll(in int cookie, in HardwareAuthToken hat, in EnrollmentType type,
+            in Feature[] features, in NativeHandle previewSurface);
 
     /**
      * authenticate:
@@ -266,6 +267,54 @@
     void removeEnrollments(in int cookie, in int[] enrollmentIds);
 
     /**
+     * getFeatures:
+     *
+     * Returns a list of currently enabled features for the provided enrollmentId.
+     *
+     * If the enrollmentId is invalid, the HAL must invoke ISessionCallback#onError with
+     * Error::UNABLE_TO_PROCESS and return to SessionState::IDLING if no subsequent work is in the
+     * queue.
+     *
+     * Once the HAL is able to start processing this request, it must notify the framework by using
+     * ISessionCallback#onStateChanged with SessionState::GETTING_FEATURES.
+     *
+     * The HAL must notify the framework about the result by calling
+     * ISessionCallback#onFeaturesRetrieved.
+     *
+     * @param cookie An identifier used to track subsystem operations related to this call path. The
+     *               client must guarantee that it is unique per ISession.
+     * @param enrollmentId the ID of the enrollment for which the features are requested.
+     */
+    void getFeatures(in int cookie, in int enrollmentId);
+
+    /**
+     * setFeature:
+     *
+     * Enables or disables a feature for the given enrollmentId. Because certain features may
+     * decrease security, the user must enter their password before this method is invoked
+     * (see @param hat). The HAL must verify the hat before changing any feature state.
+     *
+     * If either the hat or enrollmentId is invalid, the HAL must invoke ISessionCallback#onError
+     * with Error::UNABLE_TO_PROCESS and return to SessionState::IDLING if no subsequent work is in
+     * the queue.
+     *
+     * Once the HAL is able to start processing this request, it must notify the framework by using
+     * ISessionCallback#onStateChanged with SessionState::SETTING_FEATURE.
+     *
+     * After the feature is successfully set, the HAL must notify the framework by calling
+     * ISessionCallback#onFeatureSet.
+     *
+     * @param cookie An identifier used to track subsystem operations related to this call path. The
+     *               client must guarantee that it is unique per ISession.
+     * @param hat HardwareAuthToken See above documentation.
+     * @param enrollmentId the ID of the enrollment for which the feature update is requested.
+     * @param feature The feature to be enabled or disabled.
+     * @param enabled Whether the provided features should be enabled or disabled.
+     */
+    void setFeature(in int cookie, in HardwareAuthToken hat, in int enrollmentId,
+            in Feature feature, boolean enabled);
+
+    /**
      * getAuthenticatorId:
      *
      * MUST return 0 via ISessionCallback#onAuthenticatorIdRetrieved for sensors that are configured
diff --git a/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl b/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl
index 9178e3a..354f4a7 100644
--- a/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl
+++ b/biometrics/face/aidl/android/hardware/biometrics/face/ISessionCallback.aidl
@@ -17,6 +17,7 @@
 package android.hardware.biometrics.face;
 
 import android.hardware.biometrics.face.AcquiredInfo;
+import android.hardware.biometrics.face.Feature;
 import android.hardware.biometrics.face.AuthenticationFrame;
 import android.hardware.biometrics.face.EnrollmentFrame;
 import android.hardware.biometrics.face.Error;
@@ -178,6 +179,26 @@
     void onEnrollmentsEnumerated(in int[] enrollmentIds);
 
     /**
+     * This method must only be used to notify the framework during SessionState::GETTING_FEATURES.
+     *
+     * Provides a list of features that are currently enabled for the given enrollmentId.
+     *
+     * @param features A list of currently enabled features. See the Feature enum.
+     * @param enrollmentId The enrollment for which the features were requested.
+     */
+    void onFeaturesRetrieved(in Feature[] features, in int enrollmentId);
+
+    /**
+     * This method must only be used to notify the framework during SessionState::SETTING_FEATURE.
+     *
+     * Notifies the framework that ISession#setFeature has completed.
+     *
+     * @param enrollmentId The enrollment for which a feature was set.
+     * @param feature The feature that was set.
+     */
+    void onFeatureSet(in int enrollmentId, Feature feature);
+
+    /**
      * This method must only be used to notify the framework during
      * SessionState::REMOVING_ENROLLMENTS.
      *
diff --git a/biometrics/face/aidl/android/hardware/biometrics/face/SessionState.aidl b/biometrics/face/aidl/android/hardware/biometrics/face/SessionState.aidl
index e56f5d8..7675564 100644
--- a/biometrics/face/aidl/android/hardware/biometrics/face/SessionState.aidl
+++ b/biometrics/face/aidl/android/hardware/biometrics/face/SessionState.aidl
@@ -65,6 +65,16 @@
     REMOVING_ENROLLMENTS,
 
     /**
+     * The HAL is processing the ISession#getFeatures request.
+     */
+    GETTING_FEATURES,
+
+    /**
+     * The HAL is processing the ISession#setFeature request.
+     */
+    SETTING_FEATURE,
+
+    /**
      * The HAL is processing the ISession#getAuthenticatorId request.
      */
     GETTING_AUTHENTICATOR_ID,
diff --git a/biometrics/face/aidl/default/Session.cpp b/biometrics/face/aidl/default/Session.cpp
index df51879..63d1721 100644
--- a/biometrics/face/aidl/default/Session.cpp
+++ b/biometrics/face/aidl/default/Session.cpp
@@ -55,8 +55,9 @@
 }
 
 ndk::ScopedAStatus Session::enroll(
-        int32_t /*cookie*/, biometrics::face::EnrollmentType /*enrollmentType*/,
-        const keymaster::HardwareAuthToken& /*hat*/, const NativeHandle& /*previewSurface*/,
+        int32_t /*cookie*/, const keymaster::HardwareAuthToken& /*hat*/,
+        EnrollmentType /*enrollmentType*/, const std::vector<Feature>& /*features*/,
+        const NativeHandle& /*previewSurface*/,
         std::shared_ptr<biometrics::common::ICancellationSignal>* /*return_val*/) {
     return ndk::ScopedAStatus::ok();
 }
@@ -94,6 +95,17 @@
     return ndk::ScopedAStatus::ok();
 }
 
+ndk::ScopedAStatus Session::getFeatures(int32_t /*cookie*/, int32_t /*enrollmentId*/) {
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus Session::setFeature(int32_t /*cookie*/,
+                                       const keymaster::HardwareAuthToken& /*hat*/,
+                                       int32_t /*enrollmentId*/, Feature /*feature*/,
+                                       bool /*enabled*/) {
+    return ndk::ScopedAStatus::ok();
+}
+
 ndk::ScopedAStatus Session::getAuthenticatorId(int32_t /*cookie*/) {
     if (cb_) {
         cb_->onStateChanged(0, SessionState::GETTING_AUTHENTICATOR_ID);
diff --git a/biometrics/face/aidl/default/Session.h b/biometrics/face/aidl/default/Session.h
index 347d202..83cb064 100644
--- a/biometrics/face/aidl/default/Session.h
+++ b/biometrics/face/aidl/default/Session.h
@@ -34,10 +34,10 @@
 
     ndk::ScopedAStatus revokeChallenge(int32_t cookie, int64_t challenge) override;
 
-    ndk::ScopedAStatus enroll(
-            int32_t cookie, biometrics::face::EnrollmentType enrollmentType,
-            const keymaster::HardwareAuthToken& hat, const NativeHandle& previewSurface,
-            std::shared_ptr<biometrics::common::ICancellationSignal>* return_val) override;
+    ndk::ScopedAStatus enroll(int32_t cookie, const keymaster::HardwareAuthToken& hat,
+                              EnrollmentType enrollmentType, const std::vector<Feature>& features,
+                              const NativeHandle& previewSurface,
+                              std::shared_ptr<common::ICancellationSignal>* return_val) override;
 
     ndk::ScopedAStatus authenticate(
             int32_t cookie, int64_t keystoreOperationId,
@@ -51,6 +51,11 @@
     ndk::ScopedAStatus removeEnrollments(int32_t cookie,
                                          const std::vector<int32_t>& enrollmentIds) override;
 
+    ndk::ScopedAStatus getFeatures(int32_t cookie, int32_t enrollmentId) override;
+
+    ndk::ScopedAStatus setFeature(int32_t cookie, const keymaster::HardwareAuthToken& hat,
+                                  int32_t enrollmentId, Feature feature, bool enabled) override;
+
     ndk::ScopedAStatus getAuthenticatorId(int32_t cookie) override;
 
     ndk::ScopedAStatus invalidateAuthenticatorId(int32_t cookie) override;
diff --git a/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp b/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp
index 5b02a57..4cc8b4a 100644
--- a/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp
+++ b/biometrics/face/aidl/vts/VtsHalBiometricsFaceTargetTest.cpp
@@ -103,6 +103,15 @@
         return ndk::ScopedAStatus::ok();
     }
 
+    ndk::ScopedAStatus onFeaturesRetrieved(const std::vector<Feature>& /*features*/,
+                                           int32_t /*enrollmentId*/) override {
+        return ndk::ScopedAStatus::ok();
+    }
+
+    ndk::ScopedAStatus onFeatureSet(int32_t /*enrollmentId*/, Feature /*feature*/) override {
+        return ndk::ScopedAStatus::ok();
+    }
+
     ndk::ScopedAStatus onAuthenticatorIdRetrieved(int64_t /*authenticatorId*/) override {
         return ndk::ScopedAStatus::ok();
     }