diff --git a/camera/provider/2.7/default/Android.bp b/camera/provider/2.7/default/Android.bp
new file mode 100644
index 0000000..bd5da2d
--- /dev/null
+++ b/camera/provider/2.7/default/Android.bp
@@ -0,0 +1,111 @@
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "hardware_interfaces_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["hardware_interfaces_license"],
+}
+
+cc_library_shared {
+    name: "android.hardware.camera.provider@2.7-external",
+    proprietary: true,
+    srcs: ["ExternalCameraProviderImpl_2_7.cpp"],
+    shared_libs: [
+        "android.hardware.camera.common@1.0",
+        "android.hardware.camera.device@1.0",
+        "android.hardware.camera.device@3.2",
+        "android.hardware.camera.device@3.3",
+        "android.hardware.camera.device@3.4",
+        "android.hardware.camera.device@3.5",
+        "android.hardware.camera.device@3.6",
+        "android.hardware.camera.provider@2.4",
+        "android.hardware.camera.provider@2.5",
+        "android.hardware.camera.provider@2.6",
+        "android.hardware.camera.provider@2.7",
+        "android.hardware.graphics.mapper@2.0",
+        "android.hardware.graphics.mapper@3.0",
+        "android.hardware.graphics.mapper@4.0",
+        "android.hidl.allocator@1.0",
+        "android.hidl.memory@1.0",
+        "camera.device@3.3-impl",
+        "camera.device@3.4-external-impl",
+        "camera.device@3.4-impl",
+        "camera.device@3.5-external-impl",
+        "camera.device@3.5-impl",
+        "camera.device@3.6-external-impl",
+        "libcamera_metadata",
+        "libcutils",
+        "libhardware",
+        "libhidlbase",
+        "liblog",
+        "libtinyxml2",
+        "libutils",
+    ],
+    static_libs: [
+        "android.hardware.camera.common@1.0-helper",
+    ],
+    header_libs: [
+        "camera.device@3.4-external-impl_headers",
+        "camera.device@3.5-external-impl_headers",
+        "camera.device@3.6-external-impl_headers",
+    ],
+    export_include_dirs: ["."],
+}
+
+cc_defaults {
+    name: "camera_external_service_2_7_defaults",
+    defaults: ["hidl_defaults"],
+    proprietary: true,
+    relative_install_path: "hw",
+    srcs: ["external-service.cpp"],
+    compile_multilib: "32",
+    shared_libs: [
+        "android.hardware.camera.common@1.0",
+        "android.hardware.camera.device@1.0",
+        "android.hardware.camera.device@3.2",
+        "android.hardware.camera.device@3.3",
+        "android.hardware.camera.device@3.4",
+        "android.hardware.camera.device@3.5",
+        "android.hardware.camera.provider@2.4",
+        "android.hardware.camera.provider@2.4-external",
+        "android.hardware.camera.provider@2.5",
+        "android.hardware.camera.provider@2.5-external",
+        "android.hardware.camera.provider@2.6",
+        "android.hardware.camera.provider@2.7",
+        "android.hardware.camera.provider@2.7-external",
+        "android.hardware.graphics.mapper@2.0",
+        "android.hardware.graphics.mapper@3.0",
+        "android.hardware.graphics.mapper@4.0",
+        "libbinder",
+        "libcamera_metadata",
+        "libhidlbase",
+        "liblog",
+        "libtinyxml2",
+        "libutils",
+    ],
+    static_libs: [
+        "android.hardware.camera.common@1.0-helper",
+    ],
+    header_libs: [
+        "camera.device@3.4-external-impl_headers",
+        "camera.device@3.4-impl_headers",
+        "camera.device@3.5-external-impl_headers",
+        "camera.device@3.5-impl_headers",
+        "camera.device@3.6-external-impl_headers",
+    ],
+}
+
+cc_binary {
+    name: "android.hardware.camera.provider@2.7-external-service",
+    defaults: ["camera_external_service_2_7_defaults"],
+    init_rc: ["android.hardware.camera.provider@2.7-external-service.rc"],
+}
+
+cc_binary {
+    name: "android.hardware.camera.provider@2.7-external-service-lazy",
+    overrides: ["android.hardware.camera.provider@2.7-external-service"],
+    defaults: ["camera_external_service_2_7_defaults"],
+    init_rc: ["android.hardware.camera.provider@2.7-external-service-lazy.rc"],
+    cflags: ["-DLAZY_SERVICE"],
+}
diff --git a/camera/provider/2.7/default/CameraProvider_2_7.h b/camera/provider/2.7/default/CameraProvider_2_7.h
new file mode 100644
index 0000000..c34905f
--- /dev/null
+++ b/camera/provider/2.7/default/CameraProvider_2_7.h
@@ -0,0 +1,122 @@
+/*
+ * 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.
+ */
+
+#ifndef ANDROID_HARDWARE_CAMERA_PROVIDER_V2_7_CAMERAPROVIDER_H
+#define ANDROID_HARDWARE_CAMERA_PROVIDER_V2_7_CAMERAPROVIDER_H
+
+#include <android/hardware/camera/provider/2.6/ICameraProviderCallback.h>
+#include <android/hardware/camera/provider/2.7/ICameraProvider.h>
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+
+namespace android {
+namespace hardware {
+namespace camera {
+namespace provider {
+namespace V2_7 {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+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::provider::V2_4::ICameraProviderCallback;
+using ::android::hardware::camera::provider::V2_5::DeviceState;
+using ::android::hardware::camera::provider::V2_7::CameraIdAndStreamCombination;
+using ::android::hardware::camera::provider::V2_7::ICameraProvider;
+using ::android::hidl::base::V1_0::IBase;
+
+// Default recommended RPC thread count for camera provider implementations
+const int HWBINDER_THREAD_COUNT = 6;
+
+template <typename IMPL>
+struct CameraProvider : public ICameraProvider {
+    CameraProvider() : impl() {}
+    ~CameraProvider() {}
+
+    // Caller must use this method to check if CameraProvider ctor failed
+    bool isInitFailed() { return impl.isInitFailed(); }
+
+    // Methods from ::android::hardware::camera::provider::V2_4::ICameraProvider follow.
+    Return<Status> setCallback(const sp<ICameraProviderCallback>& callback) override {
+        return impl.setCallback(callback);
+    }
+
+    Return<void> getVendorTags(getVendorTags_cb _hidl_cb) override {
+        return impl.getVendorTags(_hidl_cb);
+    }
+
+    Return<void> getCameraIdList(getCameraIdList_cb _hidl_cb) override {
+        return impl.getCameraIdList(_hidl_cb);
+    }
+
+    Return<void> isSetTorchModeSupported(isSetTorchModeSupported_cb _hidl_cb) override {
+        return impl.isSetTorchModeSupported(_hidl_cb);
+    }
+
+    Return<void> getCameraDeviceInterface_V1_x(const hidl_string& cameraDeviceName,
+                                               getCameraDeviceInterface_V1_x_cb _hidl_cb) override {
+        return impl.getCameraDeviceInterface_V1_x(cameraDeviceName, _hidl_cb);
+    }
+
+    Return<void> getCameraDeviceInterface_V3_x(const hidl_string& cameraDeviceName,
+                                               getCameraDeviceInterface_V3_x_cb _hidl_cb) override {
+        return impl.getCameraDeviceInterface_V3_x(cameraDeviceName, _hidl_cb);
+    }
+
+    // Methods from ::android::hardware::camera::provider::V2_5::ICameraProvider follow.
+    Return<void> notifyDeviceStateChange(hardware::hidl_bitfield<DeviceState> newState) override {
+        return impl.notifyDeviceStateChange(newState);
+    }
+
+    // Methods from ::android::hardware::camera::provider::V2_7::ICameraProvider follow.
+    Return<void> getConcurrentStreamingCameraIds(
+            getConcurrentStreamingCameraIds_cb _hidl_cb) override {
+        return impl.getConcurrentStreamingCameraIds(_hidl_cb);
+    }
+
+    Return<void> isConcurrentStreamCombinationSupported(
+            const hidl_vec<
+                    ::android::hardware::camera::provider::V2_6::CameraIdAndStreamCombination>&
+                    configs,
+            isConcurrentStreamCombinationSupported_cb _hidl_cb) override {
+        return impl.isConcurrentStreamCombinationSupported(configs, _hidl_cb);
+    }
+
+    Return<void> isConcurrentStreamCombinationSupported_2_7(
+            const hidl_vec<CameraIdAndStreamCombination>& configs,
+            isConcurrentStreamCombinationSupported_2_7_cb _hidl_cb) override {
+        return impl.isConcurrentStreamCombinationSupported_2_7(configs, _hidl_cb);
+    }
+
+  private:
+    IMPL impl;
+};
+
+}  // namespace implementation
+}  // namespace V2_7
+}  // namespace provider
+}  // namespace camera
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_CAMERA_PROVIDER_V2_4_CAMERAPROVIDER_H
\ No newline at end of file
diff --git a/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.cpp b/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.cpp
new file mode 100644
index 0000000..c812d54
--- /dev/null
+++ b/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.cpp
@@ -0,0 +1,394 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "CamPrvdr@2.7-external"
+//#define LOG_NDEBUG 0
+#include <log/log.h>
+
+#include <cutils/properties.h>
+#include <errno.h>
+#include <linux/videodev2.h>
+#include <sys/inotify.h>
+#include <regex>
+#include "ExternalCameraDevice_3_4.h"
+#include "ExternalCameraDevice_3_5.h"
+#include "ExternalCameraDevice_3_6.h"
+#include "ExternalCameraProviderImpl_2_7.h"
+
+namespace android {
+namespace hardware {
+namespace camera {
+namespace provider {
+namespace V2_7 {
+namespace implementation {
+
+namespace {
+// "device@<version>/external/<id>"
+const std::regex kDeviceNameRE("device@([0-9]+\\.[0-9]+)/external/(.+)");
+const int kMaxDevicePathLen = 256;
+const char* kDevicePath = "/dev/";
+constexpr char kPrefix[] = "video";
+constexpr int kPrefixLen = sizeof(kPrefix) - 1;
+constexpr int kDevicePrefixLen = sizeof(kDevicePath) + kPrefixLen + 1;
+
+bool matchDeviceName(int cameraIdOffset, const hidl_string& deviceName, std::string* deviceVersion,
+                     std::string* cameraDevicePath) {
+    std::string deviceNameStd(deviceName.c_str());
+    std::smatch sm;
+    if (std::regex_match(deviceNameStd, sm, kDeviceNameRE)) {
+        if (deviceVersion != nullptr) {
+            *deviceVersion = sm[1];
+        }
+        if (cameraDevicePath != nullptr) {
+            *cameraDevicePath = "/dev/video" + std::to_string(std::stoi(sm[2]) - cameraIdOffset);
+        }
+        return true;
+    }
+    return false;
+}
+
+}  // anonymous namespace
+
+ExternalCameraProviderImpl_2_7::ExternalCameraProviderImpl_2_7()
+    : mCfg(ExternalCameraConfig::loadFromCfg()) {
+    mHotPlugThread = sp<HotplugThread>::make(this);
+    mHotPlugThread->run("ExtCamHotPlug", PRIORITY_BACKGROUND);
+
+    mPreferredHal3MinorVersion =
+            property_get_int32("ro.vendor.camera.external.hal3TrebleMinorVersion", 4);
+    ALOGV("Preferred HAL 3 minor version is %d", mPreferredHal3MinorVersion);
+    switch (mPreferredHal3MinorVersion) {
+        case 4:
+        case 5:
+        case 6:
+            // OK
+            break;
+        default:
+            ALOGW("Unknown minor camera device HAL version %d in property "
+                  "'camera.external.hal3TrebleMinorVersion', defaulting to 4",
+                  mPreferredHal3MinorVersion);
+            mPreferredHal3MinorVersion = 4;
+    }
+}
+
+ExternalCameraProviderImpl_2_7::~ExternalCameraProviderImpl_2_7() {
+    mHotPlugThread->requestExit();
+}
+
+Return<Status> ExternalCameraProviderImpl_2_7::setCallback(
+        const sp<ICameraProviderCallback>& callback) {
+    Mutex::Autolock _l(mLock);
+    mCallbacks = callback;
+    if (mCallbacks == nullptr) {
+        return Status::OK;
+    }
+    // Send a callback for all devices to initialize
+    {
+        for (const auto& pair : mCameraStatusMap) {
+            mCallbacks->cameraDeviceStatusChange(pair.first, pair.second);
+        }
+    }
+
+    return Status::OK;
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::getVendorTags(
+        ICameraProvider::getVendorTags_cb _hidl_cb) {
+    // No vendor tag support for USB camera
+    hidl_vec<VendorTagSection> zeroSections;
+    _hidl_cb(Status::OK, zeroSections);
+    return Void();
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::getCameraIdList(
+        ICameraProvider::getCameraIdList_cb _hidl_cb) {
+    // External camera HAL always report 0 camera, and extra cameras
+    // are just reported via cameraDeviceStatusChange callbacks
+    hidl_vec<hidl_string> hidlDeviceNameList;
+    _hidl_cb(Status::OK, hidlDeviceNameList);
+    return Void();
+}
+
+void ExternalCameraProviderImpl_2_7::updateAttachedCameras() {
+    ALOGV("%s start scaning for existing V4L2 devices", __FUNCTION__);
+    // Find existing /dev/video* devices
+    DIR* devdir = opendir(kDevicePath);
+    if (devdir == 0) {
+        ALOGE("%s: cannot open %s! Exiting threadloop", __FUNCTION__, kDevicePath);
+        return;
+    }
+
+    struct dirent* de;
+    while ((de = readdir(devdir)) != 0) {
+        // Find external v4l devices that's existing before we start watching and add them
+        if (!strncmp(kPrefix, de->d_name, kPrefixLen)) {
+            // TODO: This might reject some valid devices. Ex: internal is 33 and a device named 3
+            //       is added.
+            std::string deviceId(de->d_name + kPrefixLen);
+            if (mCfg.mInternalDevices.count(deviceId) == 0) {
+                ALOGV("Non-internal v4l device %s found", de->d_name);
+                char v4l2DevicePath[kMaxDevicePathLen];
+                snprintf(v4l2DevicePath, kMaxDevicePathLen, "%s%s", kDevicePath, de->d_name);
+                deviceAdded(v4l2DevicePath);
+            }
+        }
+    }
+    closedir(devdir);
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::isSetTorchModeSupported(
+        ICameraProvider::isSetTorchModeSupported_cb _hidl_cb) {
+    // setTorchMode API is supported, though right now no external camera device
+    // has a flash unit.
+    _hidl_cb(Status::OK, true);
+    return Void();
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::getCameraDeviceInterface_V1_x(
+        const hidl_string&, ICameraProvider::getCameraDeviceInterface_V1_x_cb _hidl_cb) {
+    // External Camera HAL does not support HAL1
+    _hidl_cb(Status::OPERATION_NOT_SUPPORTED, nullptr);
+    return Void();
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::getCameraDeviceInterface_V3_x(
+        const hidl_string& cameraDeviceName,
+        ICameraProvider::getCameraDeviceInterface_V3_x_cb _hidl_cb) {
+    std::string cameraDevicePath, deviceVersion;
+    bool match = matchDeviceName(mCfg.cameraIdOffset, cameraDeviceName, &deviceVersion,
+                                 &cameraDevicePath);
+    if (!match) {
+        _hidl_cb(Status::ILLEGAL_ARGUMENT, nullptr);
+        return Void();
+    }
+
+    if (mCameraStatusMap.count(cameraDeviceName) == 0 ||
+        mCameraStatusMap[cameraDeviceName] != CameraDeviceStatus::PRESENT) {
+        _hidl_cb(Status::ILLEGAL_ARGUMENT, nullptr);
+        return Void();
+    }
+
+    sp<device::V3_4::implementation::ExternalCameraDevice> deviceImpl;
+    switch (mPreferredHal3MinorVersion) {
+        case 4: {
+            ALOGV("Constructing v3.4 external camera device");
+            deviceImpl =
+                    new device::V3_4::implementation::ExternalCameraDevice(cameraDevicePath, mCfg);
+            break;
+        }
+        case 5: {
+            ALOGV("Constructing v3.5 external camera device");
+            deviceImpl =
+                    new device::V3_5::implementation::ExternalCameraDevice(cameraDevicePath, mCfg);
+            break;
+        }
+        case 6: {
+            ALOGV("Constructing v3.6 external camera device");
+            deviceImpl =
+                    new device::V3_6::implementation::ExternalCameraDevice(cameraDevicePath, mCfg);
+            break;
+        }
+        default:
+            ALOGE("%s: Unknown HAL minor version %d!", __FUNCTION__, mPreferredHal3MinorVersion);
+            _hidl_cb(Status::INTERNAL_ERROR, nullptr);
+            return Void();
+    }
+
+    if (deviceImpl == nullptr || deviceImpl->isInitFailed()) {
+        ALOGE("%s: camera device %s init failed!", __FUNCTION__, cameraDevicePath.c_str());
+        _hidl_cb(Status::INTERNAL_ERROR, nullptr);
+        return Void();
+    }
+
+    IF_ALOGV() {
+        deviceImpl->getInterface()->interfaceChain(
+                [](::android::hardware::hidl_vec<::android::hardware::hidl_string> interfaceChain) {
+                    ALOGV("Device interface chain:");
+                    for (auto iface : interfaceChain) {
+                        ALOGV("  %s", iface.c_str());
+                    }
+                });
+    }
+
+    _hidl_cb(Status::OK, deviceImpl->getInterface());
+
+    return Void();
+}
+
+void ExternalCameraProviderImpl_2_7::addExternalCamera(const char* devName) {
+    ALOGV("ExtCam: adding %s to External Camera HAL!", devName);
+    Mutex::Autolock _l(mLock);
+    std::string deviceName;
+    std::string cameraId =
+            std::to_string(mCfg.cameraIdOffset + std::atoi(devName + kDevicePrefixLen));
+    if (mPreferredHal3MinorVersion == 6) {
+        deviceName = std::string("device@3.6/external/") + cameraId;
+    } else if (mPreferredHal3MinorVersion == 5) {
+        deviceName = std::string("device@3.5/external/") + cameraId;
+    } else {
+        deviceName = std::string("device@3.4/external/") + cameraId;
+    }
+    mCameraStatusMap[deviceName] = CameraDeviceStatus::PRESENT;
+    if (mCallbacks != nullptr) {
+        mCallbacks->cameraDeviceStatusChange(deviceName, CameraDeviceStatus::PRESENT);
+    }
+}
+
+void ExternalCameraProviderImpl_2_7::deviceAdded(const char* devName) {
+    {
+        base::unique_fd fd(::open(devName, O_RDWR));
+        if (fd.get() < 0) {
+            ALOGE("%s open v4l2 device %s failed:%s", __FUNCTION__, devName, strerror(errno));
+            return;
+        }
+
+        struct v4l2_capability capability;
+        int ret = ioctl(fd.get(), VIDIOC_QUERYCAP, &capability);
+        if (ret < 0) {
+            ALOGE("%s v4l2 QUERYCAP %s failed", __FUNCTION__, devName);
+            return;
+        }
+
+        if (!(capability.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
+            ALOGW("%s device %s does not support VIDEO_CAPTURE", __FUNCTION__, devName);
+            return;
+        }
+    }
+    // See if we can initialize ExternalCameraDevice correctly
+    sp<device::V3_4::implementation::ExternalCameraDevice> deviceImpl =
+            new device::V3_4::implementation::ExternalCameraDevice(devName, mCfg);
+    if (deviceImpl == nullptr || deviceImpl->isInitFailed()) {
+        ALOGW("%s: Attempt to init camera device %s failed!", __FUNCTION__, devName);
+        return;
+    }
+    deviceImpl.clear();
+
+    addExternalCamera(devName);
+    return;
+}
+
+void ExternalCameraProviderImpl_2_7::deviceRemoved(const char* devName) {
+    Mutex::Autolock _l(mLock);
+    std::string deviceName;
+    std::string cameraId =
+            std::to_string(mCfg.cameraIdOffset + std::atoi(devName + kDevicePrefixLen));
+    if (mPreferredHal3MinorVersion == 6) {
+        deviceName = std::string("device@3.6/external/") + cameraId;
+    } else if (mPreferredHal3MinorVersion == 5) {
+        deviceName = std::string("device@3.5/external/") + cameraId;
+    } else {
+        deviceName = std::string("device@3.4/external/") + cameraId;
+    }
+    if (mCameraStatusMap.find(deviceName) != mCameraStatusMap.end()) {
+        mCameraStatusMap.erase(deviceName);
+        if (mCallbacks != nullptr) {
+            mCallbacks->cameraDeviceStatusChange(deviceName, CameraDeviceStatus::NOT_PRESENT);
+        }
+    } else {
+        ALOGE("%s: cannot find camera device %s", __FUNCTION__, devName);
+    }
+}
+
+ExternalCameraProviderImpl_2_7::HotplugThread::HotplugThread(ExternalCameraProviderImpl_2_7* parent)
+    : Thread(/*canCallJava*/ false),
+      mParent(parent),
+      mInternalDevices(parent->mCfg.mInternalDevices) {}
+
+ExternalCameraProviderImpl_2_7::HotplugThread::~HotplugThread() {}
+
+bool ExternalCameraProviderImpl_2_7::HotplugThread::threadLoop() {
+    // Update existing cameras
+    mParent->updateAttachedCameras();
+
+    // Watch new video devices
+    mINotifyFD = inotify_init();
+    if (mINotifyFD < 0) {
+        ALOGE("%s: inotify init failed! Exiting threadloop", __FUNCTION__);
+        return true;
+    }
+
+    mWd = inotify_add_watch(mINotifyFD, kDevicePath, IN_CREATE | IN_DELETE);
+    if (mWd < 0) {
+        ALOGE("%s: inotify add watch failed! Exiting threadloop", __FUNCTION__);
+        return true;
+    }
+
+    bool done = false;
+    char eventBuf[512];
+    while (!done) {
+        int offset = 0;
+        int ret = read(mINotifyFD, eventBuf, sizeof(eventBuf));
+        if (ret >= (int)sizeof(struct inotify_event)) {
+            while (offset < ret) {
+                struct inotify_event* event = (struct inotify_event*)&eventBuf[offset];
+                if (event->wd == mWd) {
+                    ALOGV("%s inotify_event %s", __FUNCTION__, event->name);
+                    if (!strncmp(kPrefix, event->name, kPrefixLen)) {
+                        std::string deviceId(event->name + kPrefixLen);
+                        if (mInternalDevices.count(deviceId) == 0) {
+                            char v4l2DevicePath[kMaxDevicePathLen];
+                            snprintf(v4l2DevicePath, kMaxDevicePathLen, "%s%s", kDevicePath,
+                                     event->name);
+                            if (event->mask & IN_CREATE) {
+                                mParent->deviceAdded(v4l2DevicePath);
+                            }
+                            if (event->mask & IN_DELETE) {
+                                mParent->deviceRemoved(v4l2DevicePath);
+                            }
+                        }
+                    }
+                }
+                offset += sizeof(struct inotify_event) + event->len;
+            }
+        }
+    }
+
+    return true;
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::notifyDeviceStateChange(
+        hidl_bitfield<DeviceState> /*newState*/) {
+    return Void();
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::getConcurrentStreamingCameraIds(
+        ICameraProvider::getConcurrentStreamingCameraIds_cb _hidl_cb) {
+    hidl_vec<hidl_vec<hidl_string>> hidl_camera_id_combinations;
+    _hidl_cb(Status::OK, hidl_camera_id_combinations);
+    return Void();
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::isConcurrentStreamCombinationSupported(
+        const hidl_vec<::android::hardware::camera::provider::V2_6::
+                               CameraIdAndStreamCombination>& /* configs */,
+        ICameraProvider::isConcurrentStreamCombinationSupported_cb _hidl_cb) {
+    _hidl_cb(Status::OK, false);
+    return Void();
+}
+
+Return<void> ExternalCameraProviderImpl_2_7::isConcurrentStreamCombinationSupported_2_7(
+        const hidl_vec<CameraIdAndStreamCombination>& /* configs */,
+        ICameraProvider::isConcurrentStreamCombinationSupported_2_7_cb _hidl_cb) {
+    _hidl_cb(Status::OK, false);
+    return Void();
+}
+
+}  // namespace implementation
+}  // namespace V2_7
+}  // namespace provider
+}  // namespace camera
+}  // namespace hardware
+}  // namespace android
\ No newline at end of file
diff --git a/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.h b/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.h
new file mode 100644
index 0000000..da9f6b3
--- /dev/null
+++ b/camera/provider/2.7/default/ExternalCameraProviderImpl_2_7.h
@@ -0,0 +1,134 @@
+/*
+ * 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.
+ */
+
+#ifndef ANDROID_HARDWARE_CAMERA_PROVIDER_V2_7_EXTCAMERAPROVIDER_H
+#define ANDROID_HARDWARE_CAMERA_PROVIDER_V2_7_EXTCAMERAPROVIDER_H
+
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+#include <utils/Mutex.h>
+#include <utils/Thread.h>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include "ExternalCameraUtils.h"
+
+#include <android/hardware/camera/provider/2.6/ICameraProviderCallback.h>
+#include <android/hardware/camera/provider/2.7/ICameraProvider.h>
+
+namespace android {
+namespace hardware {
+namespace camera {
+namespace provider {
+namespace V2_7 {
+namespace implementation {
+
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::camera::common::V1_0::CameraDeviceStatus;
+using ::android::hardware::camera::common::V1_0::Status;
+using ::android::hardware::camera::common::V1_0::VendorTagSection;
+using ::android::hardware::camera::external::common::ExternalCameraConfig;
+using ::android::hardware::camera::provider::V2_4::ICameraProviderCallback;
+using ::android::hardware::camera::provider::V2_5::DeviceState;
+using ::android::hardware::camera::provider::V2_7::CameraIdAndStreamCombination;
+using ::android::hardware::camera::provider::V2_7::ICameraProvider;
+using ::android::hidl::base::V1_0::IBase;
+
+/**
+ * The implementation of external webcam CameraProvider 2.7, separated
+ * from the HIDL interface layer to allow for implementation reuse by later
+ * provider versions.
+ *
+ * This camera provider supports standard UVC webcameras via the Linux V4L2
+ * UVC driver.
+ */
+struct ExternalCameraProviderImpl_2_7 {
+    ExternalCameraProviderImpl_2_7();
+    ~ExternalCameraProviderImpl_2_7();
+
+    // Caller must use this method to check if CameraProvider ctor failed
+    bool isInitFailed() { return false; }
+
+    // Methods from ::android::hardware::camera::provider::V2_4::ICameraProvider follow.
+    Return<Status> setCallback(const sp<ICameraProviderCallback>& callback);
+    Return<void> getVendorTags(ICameraProvider::getVendorTags_cb _hidl_cb);
+    Return<void> getCameraIdList(ICameraProvider::getCameraIdList_cb _hidl_cb);
+    Return<void> isSetTorchModeSupported(ICameraProvider::isSetTorchModeSupported_cb _hidl_cb);
+    Return<void> getCameraDeviceInterface_V1_x(const hidl_string&,
+                                               ICameraProvider::getCameraDeviceInterface_V1_x_cb);
+    Return<void> getCameraDeviceInterface_V3_x(const hidl_string&,
+                                               ICameraProvider::getCameraDeviceInterface_V3_x_cb);
+
+    // Methods from ::android::hardware::camera::provider::V2_5::ICameraProvider follow.
+    Return<void> notifyDeviceStateChange(hidl_bitfield<DeviceState> newState);
+
+    // Methods from ::android::hardware::camera::provider::V2_7::ICameraProvider follow.
+    Return<void> getConcurrentStreamingCameraIds(
+            ICameraProvider::getConcurrentStreamingCameraIds_cb _hidl_cb);
+
+    Return<void> isConcurrentStreamCombinationSupported(
+            const hidl_vec<
+                    ::android::hardware::camera::provider::V2_6::CameraIdAndStreamCombination>&
+                    configs,
+            ICameraProvider::isConcurrentStreamCombinationSupported_cb _hidl_cb);
+
+    Return<void> isConcurrentStreamCombinationSupported_2_7(
+            const hidl_vec<CameraIdAndStreamCombination>& configs,
+            ICameraProvider::isConcurrentStreamCombinationSupported_2_7_cb _hidl_cb);
+
+  private:
+    void addExternalCamera(const char* devName);
+
+    void deviceAdded(const char* devName);
+
+    void deviceRemoved(const char* devName);
+
+    void updateAttachedCameras();
+
+    class HotplugThread : public android::Thread {
+      public:
+        HotplugThread(ExternalCameraProviderImpl_2_7* parent);
+        ~HotplugThread();
+
+        virtual bool threadLoop() override;
+
+      private:
+        ExternalCameraProviderImpl_2_7* mParent = nullptr;
+        const std::unordered_set<std::string> mInternalDevices;
+
+        int mINotifyFD = -1;
+        int mWd = -1;
+    };
+
+    Mutex mLock;
+    sp<ICameraProviderCallback> mCallbacks = nullptr;
+    std::unordered_map<std::string, CameraDeviceStatus> mCameraStatusMap;  // camera id -> status
+    const ExternalCameraConfig mCfg;
+    sp<HotplugThread> mHotPlugThread;
+    int mPreferredHal3MinorVersion;
+};
+
+}  // namespace implementation
+}  // namespace V2_7
+}  // namespace provider
+}  // namespace camera
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_CAMERA_PROVIDER_V2_7_EXTCAMERAPROVIDER_H
diff --git a/camera/provider/2.7/default/android.hardware.camera.provider@2.7-external-service-lazy.rc b/camera/provider/2.7/default/android.hardware.camera.provider@2.7-external-service-lazy.rc
new file mode 100644
index 0000000..9292c4f
--- /dev/null
+++ b/camera/provider/2.7/default/android.hardware.camera.provider@2.7-external-service-lazy.rc
@@ -0,0 +1,13 @@
+service vendor.camera-provider-2-7-ext /vendor/bin/hw/android.hardware.camera.provider@2.7-external-service-lazy
+    interface android.hardware.camera.provider@2.4::ICameraProvider external/0
+    interface android.hardware.camera.provider@2.5::ICameraProvider external/0
+    interface android.hardware.camera.provider@2.6::ICameraProvider external/0
+    interface android.hardware.camera.provider@2.7::ICameraProvider external/0
+    class hal
+    oneshot
+    disabled
+    user cameraserver
+    group audio camera input drmrpc usb
+    ioprio rt 4
+    capabilities SYS_NICE
+    task_profiles CameraServiceCapacity MaxPerformance
\ No newline at end of file
diff --git a/camera/provider/2.7/default/android.hardware.camera.provider@2.7-external-service.rc b/camera/provider/2.7/default/android.hardware.camera.provider@2.7-external-service.rc
new file mode 100644
index 0000000..2c9b782
--- /dev/null
+++ b/camera/provider/2.7/default/android.hardware.camera.provider@2.7-external-service.rc
@@ -0,0 +1,11 @@
+service vendor.camera-provider-2-7-ext /vendor/bin/hw/android.hardware.camera.provider@2.7-external-service
+    interface android.hardware.camera.provider@2.4::ICameraProvider external/0
+    interface android.hardware.camera.provider@2.5::ICameraProvider external/0
+    interface android.hardware.camera.provider@2.6::ICameraProvider external/0
+    interface android.hardware.camera.provider@2.7::ICameraProvider external/0
+    class hal
+    user cameraserver
+    group audio camera input drmrpc usb
+    ioprio rt 4
+    capabilities SYS_NICE
+    task_profiles CameraServiceCapacity MaxPerformance
diff --git a/camera/provider/2.7/default/external-service.cpp b/camera/provider/2.7/default/external-service.cpp
new file mode 100644
index 0000000..90b8239
--- /dev/null
+++ b/camera/provider/2.7/default/external-service.cpp
@@ -0,0 +1,66 @@
+/*
+ * Copyright 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.
+ */
+
+#ifdef LAZY_SERVICE
+#define LOG_TAG "android.hardware.camera.provider@2.7-external-service-lazy"
+#else
+#define LOG_TAG "android.hardware.camera.provider@2.7-external-service"
+#endif
+
+#include <android/hardware/camera/provider/2.7/ICameraProvider.h>
+#include <binder/ProcessState.h>
+#include <hidl/HidlLazyUtils.h>
+#include <hidl/HidlTransportSupport.h>
+
+#include "CameraProvider_2_7.h"
+#include "ExternalCameraProviderImpl_2_7.h"
+
+using android::status_t;
+using android::hardware::camera::provider::V2_7::ICameraProvider;
+using android::hidl::base::V1_0::IBase;
+
+#ifdef LAZY_SERVICE
+const bool kLazyService = true;
+#else
+const bool kLazyService = false;
+#endif
+
+int main() {
+    using namespace android::hardware::camera::provider::V2_7::implementation;
+
+    ALOGI("CameraProvider@2.7 external webcam service is starting.");
+
+    ::android::hardware::configureRpcThreadpool(/*threads*/ HWBINDER_THREAD_COUNT,
+                                                /*willJoin*/ true);
+
+    ::android::sp<CameraProvider<ExternalCameraProviderImpl_2_7>> provider =
+            new CameraProvider<ExternalCameraProviderImpl_2_7>();
+
+    status_t status;
+    if (kLazyService) {
+        auto serviceRegistrar = ::android::hardware::LazyServiceRegistrar::getInstance();
+        status = serviceRegistrar.registerService(provider, "external/0");
+    } else {
+        status = provider->registerAsService("external/0");
+    }
+
+    LOG_ALWAYS_FATAL_IF(status != android::OK, "Error while registering provider service: %d",
+                        status);
+
+    ::android::hardware::joinRpcThreadpool();
+
+    return 0;
+}
\ No newline at end of file