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diff --git a/camera/provider/2.4/CameraProvider.h b/camera/provider/2.4/CameraProvider.h
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+/*
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef ANDROID_HARDWARE_CAMERA_PROVIDER_V2_4_CAMERAPROVIDER_H
+#define ANDROID_HARDWARE_CAMERA_PROVIDER_V2_4_CAMERAPROVIDER_H
+
+#include <regex>
+#include "hardware/camera_common.h"
+#include "utils/Mutex.h"
+#include "utils/SortedVector.h"
+#include <android/hardware/camera/provider/2.4/ICameraProvider.h>
+#include <hidl/Status.h>
+#include <hidl/MQDescriptor.h>
+#include "CameraModule.h"
+#include "VendorTagDescriptor.h"
+
+namespace android {
+namespace hardware {
+namespace camera {
+namespace provider {
+namespace V2_4 {
+namespace implementation {
+
+using ::android::hardware::camera::common::V1_0::CameraDeviceStatus;
+using ::android::hardware::camera::common::V1_0::Status;
+using ::android::hardware::camera::common::V1_0::TorchModeStatus;
+using ::android::hardware::camera::common::V1_0::VendorTag;
+using ::android::hardware::camera::common::V1_0::VendorTagSection;
+using ::android::hardware::camera::common::V1_0::helper::CameraModule;
+using ::android::hardware::camera::common::V1_0::helper::VendorTagDescriptor;
+using ::android::hardware::camera::provider::V2_4::ICameraProvider;
+using ::android::hardware::camera::provider::V2_4::ICameraProviderCallback;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::hidl_string;
+using ::android::sp;
+using ::android::Mutex;
+
+struct CameraProvider : public ICameraProvider, public camera_module_callbacks_t {
+    CameraProvider();
+    ~CameraProvider();
+
+    // Caller must use this method to check if CameraProvider ctor failed
+    bool isInitFailed() { return mInitFailed; }
+
+    // Methods from ::android::hardware::camera::provider::V2_4::ICameraProvider follow.
+    Return<Status> setCallback(const sp<ICameraProviderCallback>& callback) override;
+    Return<void> getVendorTags(getVendorTags_cb _hidl_cb) override;
+    Return<void> getCameraIdList(getCameraIdList_cb _hidl_cb) override;
+    Return<void> isSetTorchModeSupported(isSetTorchModeSupported_cb _hidl_cb) override;
+    Return<void> getCameraDeviceInterface_V1_x(
+            const hidl_string& cameraDeviceName,
+            getCameraDeviceInterface_V1_x_cb _hidl_cb) override;
+    Return<void> getCameraDeviceInterface_V3_x(
+            const hidl_string& cameraDeviceName,
+            getCameraDeviceInterface_V3_x_cb _hidl_cb) override;
+
+private:
+    Mutex mCbLock;
+    sp<ICameraProviderCallback> mCallbacks = nullptr;
+
+    sp<CameraModule> mModule;
+
+    int mNumberOfLegacyCameras;
+    std::map<std::string, camera_device_status_t> mCameraStatusMap; // camera id -> status
+    std::map<std::string, bool> mOpenLegacySupported; // camera id -> open_legacy HAL1.0 supported
+    SortedVector<std::string> mCameraIds; // the "0"/"1" legacy camera Ids
+    // (cameraId string, hidl device name) pairs
+    SortedVector<std::pair<std::string, std::string>> mCameraDeviceNames;
+
+    // Must be queried before using any APIs.
+    // APIs will only work when this returns true
+    bool mInitFailed;
+    bool initialize();
+
+    hidl_vec<VendorTagSection> mVendorTagSections;
+    bool setUpVendorTags();
+    int checkCameraVersion(int id, camera_info info);
+
+    // extract legacy camera ID/device version from a HIDL device name
+    static std::string getLegacyCameraId(const hidl_string& deviceName);
+    static int getCameraDeviceVersion(const hidl_string& deviceName);
+
+    // create HIDL device name from camera ID and device version
+    static std::string getHidlDeviceName(std::string cameraId, int deviceVersion);
+
+    // convert conventional HAL status to HIDL Status
+    static Status getHidlStatus(int);
+
+    // static callback forwarding methods
+    static void sCameraDeviceStatusChange(
+        const struct camera_module_callbacks* callbacks,
+        int camera_id,
+        int new_status);
+    static void sTorchModeStatusChange(
+        const struct camera_module_callbacks* callbacks,
+        const char* camera_id,
+        int new_status);
+};
+
+extern "C" ICameraProvider* HIDL_FETCH_ICameraProvider(const char* name);
+
+}  // namespace implementation
+}  // namespace V2_4
+}  // namespace provider
+}  // namespace camera
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_CAMERA_PROVIDER_V2_4_CAMERAPROVIDER_H