diff --git a/biometrics/common/aidl/aidl_api/android.hardware.biometrics.common/current/android/hardware/biometrics/common/FoldState.aidl b/biometrics/common/aidl/aidl_api/android.hardware.biometrics.common/current/android/hardware/biometrics/common/FoldState.aidl
new file mode 100644
index 0000000..06baf00
--- /dev/null
+++ b/biometrics/common/aidl/aidl_api/android.hardware.biometrics.common/current/android/hardware/biometrics/common/FoldState.aidl
@@ -0,0 +1,42 @@
+/*
+ * 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.common;
+/* @hide */
+@Backing(type="int") @VintfStability
+enum FoldState {
+  UNKNOWN,
+  HALF_OPENED,
+  FULLY_OPENED,
+  FULLY_CLOSED,
+}
diff --git a/biometrics/common/aidl/aidl_api/android.hardware.biometrics.common/current/android/hardware/biometrics/common/OperationContext.aidl b/biometrics/common/aidl/aidl_api/android.hardware.biometrics.common/current/android/hardware/biometrics/common/OperationContext.aidl
index 378017e..42c305a 100644
--- a/biometrics/common/aidl/aidl_api/android.hardware.biometrics.common/current/android/hardware/biometrics/common/OperationContext.aidl
+++ b/biometrics/common/aidl/aidl_api/android.hardware.biometrics.common/current/android/hardware/biometrics/common/OperationContext.aidl
@@ -45,4 +45,5 @@
   android.hardware.biometrics.common.WakeReason wakeReason = android.hardware.biometrics.common.WakeReason.UNKNOWN;
   android.hardware.biometrics.common.DisplayState displayState = android.hardware.biometrics.common.DisplayState.UNKNOWN;
   @nullable android.hardware.biometrics.common.AuthenticateReason authenticateReason;
+  android.hardware.biometrics.common.FoldState foldState = android.hardware.biometrics.common.FoldState.UNKNOWN;
 }
diff --git a/biometrics/common/aidl/android/hardware/biometrics/common/FoldState.aidl b/biometrics/common/aidl/android/hardware/biometrics/common/FoldState.aidl
new file mode 100644
index 0000000..03e606a
--- /dev/null
+++ b/biometrics/common/aidl/android/hardware/biometrics/common/FoldState.aidl
@@ -0,0 +1,38 @@
+/*
+ * 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.biometrics.common;
+
+/**
+ * Fold/Unfold state during an operation.
+ *
+ * @hide
+ */
+@VintfStability
+@Backing(type="int")
+enum FoldState {
+    /** The fold state is unknown. */
+    UNKNOWN,
+
+    /** The fold state is half opened. */
+    HALF_OPENED,
+
+    /** The fold state is fully opened. */
+    FULLY_OPENED,
+
+    /** The fold state is fully closed. */
+    FULLY_CLOSED,
+}
diff --git a/biometrics/common/aidl/android/hardware/biometrics/common/OperationContext.aidl b/biometrics/common/aidl/android/hardware/biometrics/common/OperationContext.aidl
index f4191d7..584057d 100644
--- a/biometrics/common/aidl/android/hardware/biometrics/common/OperationContext.aidl
+++ b/biometrics/common/aidl/android/hardware/biometrics/common/OperationContext.aidl
@@ -18,6 +18,7 @@
 
 import android.hardware.biometrics.common.AuthenticateReason;
 import android.hardware.biometrics.common.DisplayState;
+import android.hardware.biometrics.common.FoldState;
 import android.hardware.biometrics.common.OperationReason;
 import android.hardware.biometrics.common.WakeReason;
 
@@ -71,4 +72,7 @@
      * framework may choose to omit the reason at any time based on the device's policy.
      */
     @nullable AuthenticateReason authenticateReason;
+
+    /** The current fold/unfold state. */
+    FoldState foldState = FoldState.UNKNOWN;
 }