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diff --git a/biometrics/BiometricsFingerprint.h b/biometrics/BiometricsFingerprint.h
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+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ * Copyright (C) 2021 The LineageOS 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.
+ */
+
+#ifndef ANDROID_HARDWARE_BIOMETRICS_FINGERPRINT_V2_1_BIOMETRICSFINGERPRINT_H
+#define ANDROID_HARDWARE_BIOMETRICS_FINGERPRINT_V2_1_BIOMETRICSFINGERPRINT_H
+
+#include <log/log.h>
+#include <android/log.h>
+#include "xiaomi_fingerprint.h"
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+#include <android/hardware/biometrics/fingerprint/2.1/IBiometricsFingerprint.h>
+#include <vendor/xiaomi/hardware/fingerprintextension/1.0/IXiaomiFingerprint.h>
+
+namespace android {
+namespace hardware {
+namespace biometrics {
+namespace fingerprint {
+namespace V2_1 {
+namespace implementation {
+
+using ::android::hardware::biometrics::fingerprint::V2_1::IBiometricsFingerprint;
+using ::android::hardware::biometrics::fingerprint::V2_1::IBiometricsFingerprintClientCallback;
+using ::android::hardware::biometrics::fingerprint::V2_1::RequestStatus;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::hidl_string;
+using ::android::sp;
+using ::vendor::xiaomi::hardware::fingerprintextension::V1_0::IXiaomiFingerprint;
+
+struct BiometricsFingerprint : public IBiometricsFingerprint, public IXiaomiFingerprint {
+public:
+    BiometricsFingerprint();
+    ~BiometricsFingerprint();
+
+    // Method to wrap legacy HAL with BiometricsFingerprint class
+    static IBiometricsFingerprint* getInstance();
+    static IXiaomiFingerprint* getXiaomiInstance();
+
+    // Methods from ::android::hardware::biometrics::fingerprint::V2_1::IBiometricsFingerprint follow.
+    Return<uint64_t> setNotify(const sp<IBiometricsFingerprintClientCallback>& clientCallback) override;
+    Return<uint64_t> preEnroll() override;
+    Return<RequestStatus> enroll(const hidl_array<uint8_t, 69>& hat, uint32_t gid, uint32_t timeoutSec) override;
+    Return<RequestStatus> postEnroll() override;
+    Return<uint64_t> getAuthenticatorId() override;
+    Return<RequestStatus> cancel() override;
+    Return<RequestStatus> enumerate() override;
+    Return<RequestStatus> remove(uint32_t gid, uint32_t fid) override;
+    Return<RequestStatus> setActiveGroup(uint32_t gid, const hidl_string& storePath) override;
+    Return<RequestStatus> authenticate(uint64_t operationId, uint32_t gid) override;
+
+    // Methods from ::vendor::xiaomi::hardware::fingerprintextension::V1_0::IXiaomiFingerprint follow.
+    Return<int32_t> extCmd(int32_t cmd, int32_t param) override;
+
+private:
+    static xiaomi_fingerprint_device_t* openHal(const char *class_name);
+    static void notify(const fingerprint_msg_t *msg); /* Static callback for legacy HAL implementation */
+    static Return<RequestStatus> ErrorFilter(int32_t error);
+    static FingerprintError VendorErrorFilter(int32_t error, int32_t* vendorCode);
+    static FingerprintAcquiredInfo VendorAcquiredFilter(int32_t error, int32_t* vendorCode);
+    static BiometricsFingerprint* sInstance;
+
+    std::mutex mClientCallbackMutex;
+    sp<IBiometricsFingerprintClientCallback> mClientCallback;
+    xiaomi_fingerprint_device_t *mDevice;
+};
+
+}  // namespace implementation
+}  // namespace V2_1
+}  // namespace fingerprint
+}  // namespace biometrics
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_BIOMETRICS_FINGERPRINT_V2_1_BIOMETRICSFINGERPRINT_H